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 we are here due to reconnect, free per-smb session key
 482          * in case signing was required.
 483          */
 484         kfree(ses->auth_key.response);
 485         ses->auth_key.response = NULL;
 486
 487         /*
 488          * If memory allocation is successful, caller of this function
 489          * frees it.
 490          */
 491         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 492         if (!ses->ntlmssp)
 493                 return -ENOMEM;
 494         ses->ntlmssp->sesskey_per_smbsess = true;
 495
 496         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 497         ses->sectype = RawNTLMSSP;
 498
 499 ssetup_ntlmssp_authenticate:
 500         if (phase == NtLmChallenge)
 501                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 502
 503         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 504         if (rc)
 505                 return rc;
 506
 507         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 508         req->VcNumber = 0; /* MBZ */
 509         /* to enable echos and oplocks */
 510         req->hdr.CreditRequest = cpu_to_le16(3);
 511
 512         /* only one of SMB2 signing flags may be set in SMB2 request */
 513         if (server->sign)
 514                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 515         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 516                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 517         else
 518                 req->SecurityMode = 0;
 519
 520         req->Capabilities = 0;
 521         req->Channel = 0; /* MBZ */
 522
 523         iov[0].iov_base = (char *)req;
 524         /* 4 for rfc1002 length field and 1 for pad */
 525         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 526         if (phase == NtLmNegotiate) {
 527                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 528                                        GFP_KERNEL);
 529                 if (ntlmssp_blob == NULL) {
 530                         rc = -ENOMEM;
 531                         goto ssetup_exit;
 532                 }
 533                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 534                 if (use_spnego) {
 535                         /* blob_length = build_spnego_ntlmssp_blob(
 536                                         &security_blob,
 537                                         sizeof(struct _NEGOTIATE_MESSAGE),
 538                                         ntlmssp_blob); */
 539                         /* BB eventually need to add this */
 540                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 541                         rc = -EOPNOTSUPP;
 542                         kfree(ntlmssp_blob);
 543                         goto ssetup_exit;
 544                 } else {
 545                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 546                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 547                         security_blob = ntlmssp_blob;
 548                 }
 549         } else if (phase == NtLmAuthenticate) {
 550                 req->hdr.SessionId = ses->Suid;
 551                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 552                                        GFP_KERNEL);
 553                 if (ntlmssp_blob == NULL) {
 554                         rc = -ENOMEM;
 555                         goto ssetup_exit;
 556                 }
 557                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 558                                              nls_cp);
 559                 if (rc) {
 560                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 561                                  rc);
 562                         goto ssetup_exit; /* BB double check error handling */
 563                 }
 564                 if (use_spnego) {
 565                         /* blob_length = build_spnego_ntlmssp_blob(
 566                                                         &security_blob,
 567                                                         blob_length,
 568                                                         ntlmssp_blob); */
 569                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 570                         rc = -EOPNOTSUPP;
 571                         kfree(ntlmssp_blob);
 572                         goto ssetup_exit;
 573                 } else {
 574                         security_blob = ntlmssp_blob;
 575                 }
 576         } else {
 577                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 578                 rc = -EIO;
 579                 goto ssetup_exit;
 580         }
 581
 582         /* Testing shows that buffer offset must be at location of Buffer[0] */
 583         req->SecurityBufferOffset =
 584                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 585                                             1 /* pad */ - 4 /* rfc1001 len */);
 586         req->SecurityBufferLength = cpu_to_le16(blob_length);
 587         iov[1].iov_base = security_blob;
 588         iov[1].iov_len = blob_length;
 589
 590         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 591
 592         /* BB add code to build os and lm fields */
 593
 594         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 595                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 596
 597         kfree(security_blob);
 598         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 599         if (resp_buftype != CIFS_NO_BUFFER &&
 600             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 601                 if (phase != NtLmNegotiate) {
 602                         cifs_dbg(VFS, "Unexpected more processing error\n");
 603                         goto ssetup_exit;
 604                 }
 605                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 606                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 607                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 608                                  le16_to_cpu(rsp->SecurityBufferOffset));
 609                         rc = -EIO;
 610                         goto ssetup_exit;
 611                 }
 612
 613                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 614                 phase = NtLmChallenge; /* process ntlmssp challenge */
 615                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 616                 ses->Suid = rsp->hdr.SessionId;
 617                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 618                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 619         }
 620
 621         /*
 622          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 623          * but at least the raw NTLMSSP case works.
 624          */
 625         /*
 626          * No tcon so can't do
 627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 628          */
 629         if (rc != 0)
 630                 goto ssetup_exit;
 631
 632         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 633 ssetup_exit:
 634         free_rsp_buf(resp_buftype, rsp);
 635
 636         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 637         if ((phase == NtLmChallenge) && (rc == 0))
 638                 goto ssetup_ntlmssp_authenticate;
 639
 640         if (!rc) {
 641                 mutex_lock(&server->srv_mutex);
 642                 if (server->sign && server->ops->generate_signingkey) {
 643                         rc = server->ops->generate_signingkey(ses);
 644                         kfree(ses->auth_key.response);
 645                         ses->auth_key.response = NULL;
 646                         if (rc) {
 647                                 cifs_dbg(FYI,
 648                                         "SMB3 session key generation failed\n");
 649                                 mutex_unlock(&server->srv_mutex);
 650                                 goto keygen_exit;
 651                         }
 652                 }
 653                 if (!server->session_estab) {
 654                         server->sequence_number = 0x2;
 655                         server->session_estab = true;
 656                 }
 657                 mutex_unlock(&server->srv_mutex);
 658
 659                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 660                 spin_lock(&GlobalMid_Lock);
 661                 ses->status = CifsGood;
 662                 ses->need_reconnect = false;
 663                 spin_unlock(&GlobalMid_Lock);
 664         }
 665
 666 keygen_exit:
 667         if (!server->sign) {
 668                 kfree(ses->auth_key.response);
 669                 ses->auth_key.response = NULL;
 670         }
 671         kfree(ses->ntlmssp);
 672
 673         return rc;
 674 }
 675
 676 int
 677 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 678 {
 679         struct smb2_logoff_req *req; /* response is also trivial struct */
 680         int rc = 0;
 681         struct TCP_Server_Info *server;
 682
 683         cifs_dbg(FYI, "disconnect session %p\n", ses);
 684
 685         if (ses && (ses->server))
 686                 server = ses->server;
 687         else
 688                 return -EIO;
 689
 690         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 691         if (rc)
 692                 return rc;
 693
 694          /* since no tcon, smb2_init can not do this, so do here */
 695         req->hdr.SessionId = ses->Suid;
 696         if (server->sign)
 697                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 698
 699         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 700         /*
 701          * No tcon so can't do
 702          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 703          */
 704         return rc;
 705 }
 706
 707 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 708 {
 709         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 710 }
 711
 712 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 713
 714 int
 715 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 716           struct cifs_tcon *tcon, const struct nls_table *cp)
 717 {
 718         struct smb2_tree_connect_req *req;
 719         struct smb2_tree_connect_rsp *rsp = NULL;
 720         struct kvec iov[2];
 721         int rc = 0;
 722         int resp_buftype;
 723         int unc_path_len;
 724         struct TCP_Server_Info *server;
 725         __le16 *unc_path = NULL;
 726
 727         cifs_dbg(FYI, "TCON\n");
 728
 729         if ((ses->server) && tree)
 730                 server = ses->server;
 731         else
 732                 return -EIO;
 733
 734         if (tcon && tcon->bad_network_name)
 735                 return -ENOENT;
 736
 737         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 738         if (unc_path == NULL)
 739                 return -ENOMEM;
 740
 741         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 742         unc_path_len *= 2;
 743         if (unc_path_len < 2) {
 744                 kfree(unc_path);
 745                 return -EINVAL;
 746         }
 747
 748         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 749         if (rc) {
 750                 kfree(unc_path);
 751                 return rc;
 752         }
 753
 754         if (tcon == NULL) {
 755                 /* since no tcon, smb2_init can not do this, so do here */
 756                 req->hdr.SessionId = ses->Suid;
 757                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 758                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 759         }
 760
 761         iov[0].iov_base = (char *)req;
 762         /* 4 for rfc1002 length field and 1 for pad */
 763         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 764
 765         /* Testing shows that buffer offset must be at location of Buffer[0] */
 766         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 767                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 768         req->PathLength = cpu_to_le16(unc_path_len - 2);
 769         iov[1].iov_base = unc_path;
 770         iov[1].iov_len = unc_path_len;
 771
 772         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 773
 774         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 775         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 776
 777         if (rc != 0) {
 778                 if (tcon) {
 779                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 780                         tcon->need_reconnect = true;
 781                 }
 782                 goto tcon_error_exit;
 783         }
 784
 785         if (tcon == NULL) {
 786                 ses->ipc_tid = rsp->hdr.TreeId;
 787                 goto tcon_exit;
 788         }
 789
 790         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 791                 cifs_dbg(FYI, "connection to disk share\n");
 792         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 793                 tcon->ipc = true;
 794                 cifs_dbg(FYI, "connection to pipe share\n");
 795         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 796                 tcon->print = true;
 797                 cifs_dbg(FYI, "connection to printer\n");
 798         } else {
 799                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 800                 rc = -EOPNOTSUPP;
 801                 goto tcon_error_exit;
 802         }
 803
 804         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 805         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 806         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 807         tcon->tidStatus = CifsGood;
 808         tcon->need_reconnect = false;
 809         tcon->tid = rsp->hdr.TreeId;
 810         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 811
 812         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 813             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 814                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 815
 816 tcon_exit:
 817         free_rsp_buf(resp_buftype, rsp);
 818         kfree(unc_path);
 819         return rc;
 820
 821 tcon_error_exit:
 822         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 823                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 824                 tcon->bad_network_name = true;
 825         }
 826         goto tcon_exit;
 827 }
 828
 829 int
 830 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 831 {
 832         struct smb2_tree_disconnect_req *req; /* response is trivial */
 833         int rc = 0;
 834         struct TCP_Server_Info *server;
 835         struct cifs_ses *ses = tcon->ses;
 836
 837         cifs_dbg(FYI, "Tree Disconnect\n");
 838
 839         if (ses && (ses->server))
 840                 server = ses->server;
 841         else
 842                 return -EIO;
 843
 844         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 845                 return 0;
 846
 847         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 848         if (rc)
 849                 return rc;
 850
 851         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 852         if (rc)
 853                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 854
 855         return rc;
 856 }
 857
 858
 859 static struct create_durable *
 860 create_durable_buf(void)
 861 {
 862         struct create_durable *buf;
 863
 864         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 865         if (!buf)
 866                 return NULL;
 867
 868         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 869                                         (struct create_durable, Data));
 870         buf->ccontext.DataLength = cpu_to_le32(16);
 871         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 872                                 (struct create_durable, Name));
 873         buf->ccontext.NameLength = cpu_to_le16(4);
 874         buf->Name[0] = 'D';
 875         buf->Name[1] = 'H';
 876         buf->Name[2] = 'n';
 877         buf->Name[3] = 'Q';
 878         return buf;
 879 }
 880
 881 static struct create_durable *
 882 create_reconnect_durable_buf(struct cifs_fid *fid)
 883 {
 884         struct create_durable *buf;
 885
 886         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 887         if (!buf)
 888                 return NULL;
 889
 890         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 891                                         (struct create_durable, Data));
 892         buf->ccontext.DataLength = cpu_to_le32(16);
 893         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 894                                 (struct create_durable, Name));
 895         buf->ccontext.NameLength = cpu_to_le16(4);
 896         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 897         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 898         buf->Name[0] = 'D';
 899         buf->Name[1] = 'H';
 900         buf->Name[2] = 'n';
 901         buf->Name[3] = 'C';
 902         return buf;
 903 }
 904
 905 static __u8
 906 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp)
 907 {
 908         char *data_offset;
 909         struct create_context *cc;
 910         unsigned int next = 0;
 911         char *name;
 912
 913         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 914         cc = (struct create_context *)data_offset;
 915         do {
 916                 cc = (struct create_context *)((char *)cc + next);
 917                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
 918                 if (le16_to_cpu(cc->NameLength) != 4 ||
 919                     strncmp(name, "RqLs", 4)) {
 920                         next = le32_to_cpu(cc->Next);
 921                         continue;
 922                 }
 923                 return server->ops->parse_lease_buf(cc);
 924         } while (next != 0);
 925
 926         return 0;
 927 }
 928
 929 static int
 930 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
 931                   unsigned int *num_iovec, __u8 *oplock)
 932 {
 933         struct smb2_create_req *req = iov[0].iov_base;
 934         unsigned int num = *num_iovec;
 935
 936         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
 937         if (iov[num].iov_base == NULL)
 938                 return -ENOMEM;
 939         iov[num].iov_len = server->vals->create_lease_size;
 940         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 941         if (!req->CreateContextsOffset)
 942                 req->CreateContextsOffset = cpu_to_le32(
 943                                 sizeof(struct smb2_create_req) - 4 +
 944                                 iov[num - 1].iov_len);
 945         le32_add_cpu(&req->CreateContextsLength,
 946                      server->vals->create_lease_size);
 947         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
 948         *num_iovec = num + 1;
 949         return 0;
 950 }
 951
 952 static int
 953 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 954                     struct cifs_open_parms *oparms)
 955 {
 956         struct smb2_create_req *req = iov[0].iov_base;
 957         unsigned int num = *num_iovec;
 958
 959         if (oparms->reconnect) {
 960                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 961                 /* indicate that we don't need to relock the file */
 962                 oparms->reconnect = false;
 963         } else
 964                 iov[num].iov_base = create_durable_buf();
 965         if (iov[num].iov_base == NULL)
 966                 return -ENOMEM;
 967         iov[num].iov_len = sizeof(struct create_durable);
 968         if (!req->CreateContextsOffset)
 969                 req->CreateContextsOffset =
 970                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 971                                                                 iov[1].iov_len);
 972         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
 973         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
 974         *num_iovec = num + 1;
 975         return 0;
 976 }
 977
 978 int
 979 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
 980           __u8 *oplock, struct smb2_file_all_info *buf,
 981           struct smb2_err_rsp **err_buf)
 982 {
 983         struct smb2_create_req *req;
 984         struct smb2_create_rsp *rsp;
 985         struct TCP_Server_Info *server;
 986         struct cifs_tcon *tcon = oparms->tcon;
 987         struct cifs_ses *ses = tcon->ses;
 988         struct kvec iov[4];
 989         int resp_buftype;
 990         int uni_path_len;
 991         __le16 *copy_path = NULL;
 992         int copy_size;
 993         int rc = 0;
 994         unsigned int num_iovecs = 2;
 995         __u32 file_attributes = 0;
 996
 997         cifs_dbg(FYI, "create/open\n");
 998
 999         if (ses && (ses->server))
1000                 server = ses->server;
1001         else
1002                 return -EIO;
1003
1004         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1005         if (rc)
1006                 return rc;
1007
1008         if (oparms->create_options & CREATE_OPTION_READONLY)
1009                 file_attributes |= ATTR_READONLY;
1010
1011         req->ImpersonationLevel = IL_IMPERSONATION;
1012         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1013         /* File attributes ignored on open (used in create though) */
1014         req->FileAttributes = cpu_to_le32(file_attributes);
1015         req->ShareAccess = FILE_SHARE_ALL_LE;
1016         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1017         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1018         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1019         /* do not count rfc1001 len field */
1020         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1021
1022         iov[0].iov_base = (char *)req;
1023         /* 4 for rfc1002 length field */
1024         iov[0].iov_len = get_rfc1002_length(req) + 4;
1025
1026         /* MUST set path len (NameLength) to 0 opening root of share */
1027         req->NameLength = cpu_to_le16(uni_path_len - 2);
1028         /* -1 since last byte is buf[0] which is sent below (path) */
1029         iov[0].iov_len--;
1030         if (uni_path_len % 8 != 0) {
1031                 copy_size = uni_path_len / 8 * 8;
1032                 if (copy_size < uni_path_len)
1033                         copy_size += 8;
1034
1035                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1036                 if (!copy_path)
1037                         return -ENOMEM;
1038                 memcpy((char *)copy_path, (const char *)path,
1039                         uni_path_len);
1040                 uni_path_len = copy_size;
1041                 path = copy_path;
1042         }
1043
1044         iov[1].iov_len = uni_path_len;
1045         iov[1].iov_base = path;
1046         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1047         inc_rfc1001_len(req, uni_path_len - 1);
1048
1049         if (!server->oplocks)
1050                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1051
1052         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1053             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1054                 req->RequestedOplockLevel = *oplock;
1055         else {
1056                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1057                 if (rc) {
1058                         cifs_small_buf_release(req);
1059                         kfree(copy_path);
1060                         return rc;
1061                 }
1062         }
1063
1064         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1065                 /* need to set Next field of lease context if we request it */
1066                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1067                         struct create_context *ccontext =
1068                             (struct create_context *)iov[num_iovecs-1].iov_base;
1069                         ccontext->Next =
1070                                 cpu_to_le32(server->vals->create_lease_size);
1071                 }
1072                 rc = add_durable_context(iov, &num_iovecs, oparms);
1073                 if (rc) {
1074                         cifs_small_buf_release(req);
1075                         kfree(copy_path);
1076                         kfree(iov[num_iovecs-1].iov_base);
1077                         return rc;
1078                 }
1079         }
1080
1081         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1082         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1083
1084         if (rc != 0) {
1085                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1086                 if (err_buf)
1087                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1088                                            GFP_KERNEL);
1089                 goto creat_exit;
1090         }
1091
1092         oparms->fid->persistent_fid = rsp->PersistentFileId;
1093         oparms->fid->volatile_fid = rsp->VolatileFileId;
1094
1095         if (buf) {
1096                 memcpy(buf, &rsp->CreationTime, 32);
1097                 buf->AllocationSize = rsp->AllocationSize;
1098                 buf->EndOfFile = rsp->EndofFile;
1099                 buf->Attributes = rsp->FileAttributes;
1100                 buf->NumberOfLinks = cpu_to_le32(1);
1101                 buf->DeletePending = 0;
1102         }
1103
1104         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1105                 *oplock = parse_lease_state(server, rsp);
1106         else
1107                 *oplock = rsp->OplockLevel;
1108 creat_exit:
1109         kfree(copy_path);
1110         free_rsp_buf(resp_buftype, rsp);
1111         return rc;
1112 }
1113
1114 /*
1115  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1116  */
1117 int
1118 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1119            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1120            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1121 {
1122         struct smb2_ioctl_req *req;
1123         struct smb2_ioctl_rsp *rsp;
1124         struct TCP_Server_Info *server;
1125         struct cifs_ses *ses = tcon->ses;
1126         struct kvec iov[2];
1127         int resp_buftype;
1128         int num_iovecs;
1129         int rc = 0;
1130
1131         cifs_dbg(FYI, "SMB2 IOCTL\n");
1132
1133         /* zero out returned data len, in case of error */
1134         if (plen)
1135                 *plen = 0;
1136
1137         if (ses && (ses->server))
1138                 server = ses->server;
1139         else
1140                 return -EIO;
1141
1142         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1143         if (rc)
1144                 return rc;
1145
1146         req->CtlCode = cpu_to_le32(opcode);
1147         req->PersistentFileId = persistent_fid;
1148         req->VolatileFileId = volatile_fid;
1149
1150         if (indatalen) {
1151                 req->InputCount = cpu_to_le32(indatalen);
1152                 /* do not set InputOffset if no input data */
1153                 req->InputOffset =
1154                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1155                 iov[1].iov_base = in_data;
1156                 iov[1].iov_len = indatalen;
1157                 num_iovecs = 2;
1158         } else
1159                 num_iovecs = 1;
1160
1161         req->OutputOffset = 0;
1162         req->OutputCount = 0; /* MBZ */
1163
1164         /*
1165          * Could increase MaxOutputResponse, but that would require more
1166          * than one credit. Windows typically sets this smaller, but for some
1167          * ioctls it may be useful to allow server to send more. No point
1168          * limiting what the server can send as long as fits in one credit
1169          */
1170         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1171
1172         if (is_fsctl)
1173                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1174         else
1175                 req->Flags = 0;
1176
1177         iov[0].iov_base = (char *)req;
1178         /* 4 for rfc1002 length field */
1179         iov[0].iov_len = get_rfc1002_length(req) + 4;
1180
1181         if (indatalen)
1182                 inc_rfc1001_len(req, indatalen);
1183
1184         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1185         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1186
1187         if (rc != 0) {
1188                 if (tcon)
1189                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1190                 goto ioctl_exit;
1191         }
1192
1193         /* check if caller wants to look at return data or just return rc */
1194         if ((plen == NULL) || (out_data == NULL))
1195                 goto ioctl_exit;
1196
1197         *plen = le32_to_cpu(rsp->OutputCount);
1198
1199         /* We check for obvious errors in the output buffer length and offset */
1200         if (*plen == 0)
1201                 goto ioctl_exit; /* server returned no data */
1202         else if (*plen > 0xFF00) {
1203                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1204                 *plen = 0;
1205                 rc = -EIO;
1206                 goto ioctl_exit;
1207         }
1208
1209         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1210                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1211                         le32_to_cpu(rsp->OutputOffset));
1212                 *plen = 0;
1213                 rc = -EIO;
1214                 goto ioctl_exit;
1215         }
1216
1217         *out_data = kmalloc(*plen, GFP_KERNEL);
1218         if (*out_data == NULL) {
1219                 rc = -ENOMEM;
1220                 goto ioctl_exit;
1221         }
1222
1223         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1224                *plen);
1225 ioctl_exit:
1226         free_rsp_buf(resp_buftype, rsp);
1227         return rc;
1228 }
1229
1230 int
1231 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1232            u64 persistent_fid, u64 volatile_fid)
1233 {
1234         struct smb2_close_req *req;
1235         struct smb2_close_rsp *rsp;
1236         struct TCP_Server_Info *server;
1237         struct cifs_ses *ses = tcon->ses;
1238         struct kvec iov[1];
1239         int resp_buftype;
1240         int rc = 0;
1241
1242         cifs_dbg(FYI, "Close\n");
1243
1244         if (ses && (ses->server))
1245                 server = ses->server;
1246         else
1247                 return -EIO;
1248
1249         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1250         if (rc)
1251                 return rc;
1252
1253         req->PersistentFileId = persistent_fid;
1254         req->VolatileFileId = volatile_fid;
1255
1256         iov[0].iov_base = (char *)req;
1257         /* 4 for rfc1002 length field */
1258         iov[0].iov_len = get_rfc1002_length(req) + 4;
1259
1260         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1261         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1262
1263         if (rc != 0) {
1264                 if (tcon)
1265                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1266                 goto close_exit;
1267         }
1268
1269         /* BB FIXME - decode close response, update inode for caching */
1270
1271 close_exit:
1272         free_rsp_buf(resp_buftype, rsp);
1273         return rc;
1274 }
1275
1276 static int
1277 validate_buf(unsigned int offset, unsigned int buffer_length,
1278              struct smb2_hdr *hdr, unsigned int min_buf_size)
1279
1280 {
1281         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1282         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1283         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1284         char *end_of_buf = begin_of_buf + buffer_length;
1285
1286
1287         if (buffer_length < min_buf_size) {
1288                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1289                          buffer_length, min_buf_size);
1290                 return -EINVAL;
1291         }
1292
1293         /* check if beyond RFC1001 maximum length */
1294         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1295                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1296                          buffer_length, smb_len);
1297                 return -EINVAL;
1298         }
1299
1300         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1301                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1302                 return -EINVAL;
1303         }
1304
1305         return 0;
1306 }
1307
1308 /*
1309  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1310  * Caller must free buffer.
1311  */
1312 static int
1313 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1314                       struct smb2_hdr *hdr, unsigned int minbufsize,
1315                       char *data)
1316
1317 {
1318         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1319         int rc;
1320
1321         if (!data)
1322                 return -EINVAL;
1323
1324         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1325         if (rc)
1326                 return rc;
1327
1328         memcpy(data, begin_of_buf, buffer_length);
1329
1330         return 0;
1331 }
1332
1333 static int
1334 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1335            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1336            size_t output_len, size_t min_len, void *data)
1337 {
1338         struct smb2_query_info_req *req;
1339         struct smb2_query_info_rsp *rsp = NULL;
1340         struct kvec iov[2];
1341         int rc = 0;
1342         int resp_buftype;
1343         struct TCP_Server_Info *server;
1344         struct cifs_ses *ses = tcon->ses;
1345
1346         cifs_dbg(FYI, "Query Info\n");
1347
1348         if (ses && (ses->server))
1349                 server = ses->server;
1350         else
1351                 return -EIO;
1352
1353         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1354         if (rc)
1355                 return rc;
1356
1357         req->InfoType = SMB2_O_INFO_FILE;
1358         req->FileInfoClass = info_class;
1359         req->PersistentFileId = persistent_fid;
1360         req->VolatileFileId = volatile_fid;
1361         /* 4 for rfc1002 length field and 1 for Buffer */
1362         req->InputBufferOffset =
1363                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1364         req->OutputBufferLength = cpu_to_le32(output_len);
1365
1366         iov[0].iov_base = (char *)req;
1367         /* 4 for rfc1002 length field */
1368         iov[0].iov_len = get_rfc1002_length(req) + 4;
1369
1370         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1371         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1372
1373         if (rc) {
1374                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1375                 goto qinf_exit;
1376         }
1377
1378         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1379                                    le32_to_cpu(rsp->OutputBufferLength),
1380                                    &rsp->hdr, min_len, data);
1381
1382 qinf_exit:
1383         free_rsp_buf(resp_buftype, rsp);
1384         return rc;
1385 }
1386
1387 int
1388 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1389                 u64 persistent_fid, u64 volatile_fid,
1390                 struct smb2_file_all_info *data)
1391 {
1392         return query_info(xid, tcon, persistent_fid, volatile_fid,
1393                           FILE_ALL_INFORMATION,
1394                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1395                           sizeof(struct smb2_file_all_info), data);
1396 }
1397
1398 int
1399 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1400                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1401 {
1402         return query_info(xid, tcon, persistent_fid, volatile_fid,
1403                           FILE_INTERNAL_INFORMATION,
1404                           sizeof(struct smb2_file_internal_info),
1405                           sizeof(struct smb2_file_internal_info), uniqueid);
1406 }
1407
1408 /*
1409  * This is a no-op for now. We're not really interested in the reply, but
1410  * rather in the fact that the server sent one and that server->lstrp
1411  * gets updated.
1412  *
1413  * FIXME: maybe we should consider checking that the reply matches request?
1414  */
1415 static void
1416 smb2_echo_callback(struct mid_q_entry *mid)
1417 {
1418         struct TCP_Server_Info *server = mid->callback_data;
1419         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1420         unsigned int credits_received = 1;
1421
1422         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1423                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1424
1425         DeleteMidQEntry(mid);
1426         add_credits(server, credits_received, CIFS_ECHO_OP);
1427 }
1428
1429 int
1430 SMB2_echo(struct TCP_Server_Info *server)
1431 {
1432         struct smb2_echo_req *req;
1433         int rc = 0;
1434         struct kvec iov;
1435         struct smb_rqst rqst = { .rq_iov = &iov,
1436                                  .rq_nvec = 1 };
1437
1438         cifs_dbg(FYI, "In echo request\n");
1439
1440         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1441         if (rc)
1442                 return rc;
1443
1444         req->hdr.CreditRequest = cpu_to_le16(1);
1445
1446         iov.iov_base = (char *)req;
1447         /* 4 for rfc1002 length field */
1448         iov.iov_len = get_rfc1002_length(req) + 4;
1449
1450         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1451                              CIFS_ECHO_OP);
1452         if (rc)
1453                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1454
1455         cifs_small_buf_release(req);
1456         return rc;
1457 }
1458
1459 int
1460 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1461            u64 volatile_fid)
1462 {
1463         struct smb2_flush_req *req;
1464         struct TCP_Server_Info *server;
1465         struct cifs_ses *ses = tcon->ses;
1466         struct kvec iov[1];
1467         int resp_buftype;
1468         int rc = 0;
1469
1470         cifs_dbg(FYI, "Flush\n");
1471
1472         if (ses && (ses->server))
1473                 server = ses->server;
1474         else
1475                 return -EIO;
1476
1477         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1478         if (rc)
1479                 return rc;
1480
1481         req->PersistentFileId = persistent_fid;
1482         req->VolatileFileId = volatile_fid;
1483
1484         iov[0].iov_base = (char *)req;
1485         /* 4 for rfc1002 length field */
1486         iov[0].iov_len = get_rfc1002_length(req) + 4;
1487
1488         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1489
1490         if ((rc != 0) && tcon)
1491                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1492
1493         free_rsp_buf(resp_buftype, iov[0].iov_base);
1494         return rc;
1495 }
1496
1497 /*
1498  * To form a chain of read requests, any read requests after the first should
1499  * have the end_of_chain boolean set to true.
1500  */
1501 static int
1502 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1503                   unsigned int remaining_bytes, int request_type)
1504 {
1505         int rc = -EACCES;
1506         struct smb2_read_req *req = NULL;
1507
1508         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1509         if (rc)
1510                 return rc;
1511         if (io_parms->tcon->ses->server == NULL)
1512                 return -ECONNABORTED;
1513
1514         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1515
1516         req->PersistentFileId = io_parms->persistent_fid;
1517         req->VolatileFileId = io_parms->volatile_fid;
1518         req->ReadChannelInfoOffset = 0; /* reserved */
1519         req->ReadChannelInfoLength = 0; /* reserved */
1520         req->Channel = 0; /* reserved */
1521         req->MinimumCount = 0;
1522         req->Length = cpu_to_le32(io_parms->length);
1523         req->Offset = cpu_to_le64(io_parms->offset);
1524
1525         if (request_type & CHAINED_REQUEST) {
1526                 if (!(request_type & END_OF_CHAIN)) {
1527                         /* 4 for rfc1002 length field */
1528                         req->hdr.NextCommand =
1529                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1530                 } else /* END_OF_CHAIN */
1531                         req->hdr.NextCommand = 0;
1532                 if (request_type & RELATED_REQUEST) {
1533                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1534                         /*
1535                          * Related requests use info from previous read request
1536                          * in chain.
1537                          */
1538                         req->hdr.SessionId = 0xFFFFFFFF;
1539                         req->hdr.TreeId = 0xFFFFFFFF;
1540                         req->PersistentFileId = 0xFFFFFFFF;
1541                         req->VolatileFileId = 0xFFFFFFFF;
1542                 }
1543         }
1544         if (remaining_bytes > io_parms->length)
1545                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1546         else
1547                 req->RemainingBytes = 0;
1548
1549         iov[0].iov_base = (char *)req;
1550         /* 4 for rfc1002 length field */
1551         iov[0].iov_len = get_rfc1002_length(req) + 4;
1552         return rc;
1553 }
1554
1555 static void
1556 smb2_readv_callback(struct mid_q_entry *mid)
1557 {
1558         struct cifs_readdata *rdata = mid->callback_data;
1559         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1560         struct TCP_Server_Info *server = tcon->ses->server;
1561         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1562         unsigned int credits_received = 1;
1563         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1564                                  .rq_nvec = 1,
1565                                  .rq_pages = rdata->pages,
1566                                  .rq_npages = rdata->nr_pages,
1567                                  .rq_pagesz = rdata->pagesz,
1568                                  .rq_tailsz = rdata->tailsz };
1569
1570         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1571                  __func__, mid->mid, mid->mid_state, rdata->result,
1572                  rdata->bytes);
1573
1574         switch (mid->mid_state) {
1575         case MID_RESPONSE_RECEIVED:
1576                 credits_received = le16_to_cpu(buf->CreditRequest);
1577                 /* result already set, check signature */
1578                 if (server->sign) {
1579                         int rc;
1580
1581                         rc = smb2_verify_signature(&rqst, server);
1582                         if (rc)
1583                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1584                                          rc);
1585                 }
1586                 /* FIXME: should this be counted toward the initiating task? */
1587                 task_io_account_read(rdata->bytes);
1588                 cifs_stats_bytes_read(tcon, rdata->bytes);
1589                 break;
1590         case MID_REQUEST_SUBMITTED:
1591         case MID_RETRY_NEEDED:
1592                 rdata->result = -EAGAIN;
1593                 break;
1594         default:
1595                 if (rdata->result != -ENODATA)
1596                         rdata->result = -EIO;
1597         }
1598
1599         if (rdata->result)
1600                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1601
1602         queue_work(cifsiod_wq, &rdata->work);
1603         DeleteMidQEntry(mid);
1604         add_credits(server, credits_received, 0);
1605 }
1606
1607 /* smb2_async_readv - send an async write, and set up mid to handle result */
1608 int
1609 smb2_async_readv(struct cifs_readdata *rdata)
1610 {
1611         int rc;
1612         struct smb2_hdr *buf;
1613         struct cifs_io_parms io_parms;
1614         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1615                                  .rq_nvec = 1 };
1616
1617         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1618                  __func__, rdata->offset, rdata->bytes);
1619
1620         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1621         io_parms.offset = rdata->offset;
1622         io_parms.length = rdata->bytes;
1623         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1624         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1625         io_parms.pid = rdata->pid;
1626         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1627         if (rc)
1628                 return rc;
1629
1630         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1631         /* 4 for rfc1002 length field */
1632         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1633
1634         kref_get(&rdata->refcount);
1635         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1636                              cifs_readv_receive, smb2_readv_callback,
1637                              rdata, 0);
1638         if (rc) {
1639                 kref_put(&rdata->refcount, cifs_readdata_release);
1640                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1641         }
1642
1643         cifs_small_buf_release(buf);
1644         return rc;
1645 }
1646
1647 int
1648 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1649           unsigned int *nbytes, char **buf, int *buf_type)
1650 {
1651         int resp_buftype, rc = -EACCES;
1652         struct smb2_read_rsp *rsp = NULL;
1653         struct kvec iov[1];
1654
1655         *nbytes = 0;
1656         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1657         if (rc)
1658                 return rc;
1659
1660         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1661                           &resp_buftype, CIFS_LOG_ERROR);
1662
1663         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1664
1665         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1666                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1667                 return 0;
1668         }
1669
1670         if (rc) {
1671                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1672                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1673         } else {
1674                 *nbytes = le32_to_cpu(rsp->DataLength);
1675                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1676                     (*nbytes > io_parms->length)) {
1677                         cifs_dbg(FYI, "bad length %d for count %d\n",
1678                                  *nbytes, io_parms->length);
1679                         rc = -EIO;
1680                         *nbytes = 0;
1681                 }
1682         }
1683
1684         if (*buf) {
1685                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1686                        *nbytes);
1687                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1688         } else if (resp_buftype != CIFS_NO_BUFFER) {
1689                 *buf = iov[0].iov_base;
1690                 if (resp_buftype == CIFS_SMALL_BUFFER)
1691                         *buf_type = CIFS_SMALL_BUFFER;
1692                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1693                         *buf_type = CIFS_LARGE_BUFFER;
1694         }
1695         return rc;
1696 }
1697
1698 /*
1699  * Check the mid_state and signature on received buffer (if any), and queue the
1700  * workqueue completion task.
1701  */
1702 static void
1703 smb2_writev_callback(struct mid_q_entry *mid)
1704 {
1705         struct cifs_writedata *wdata = mid->callback_data;
1706         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1707         unsigned int written;
1708         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1709         unsigned int credits_received = 1;
1710
1711         switch (mid->mid_state) {
1712         case MID_RESPONSE_RECEIVED:
1713                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1714                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1715                 if (wdata->result != 0)
1716                         break;
1717
1718                 written = le32_to_cpu(rsp->DataLength);
1719                 /*
1720                  * Mask off high 16 bits when bytes written as returned
1721                  * by the server is greater than bytes requested by the
1722                  * client. OS/2 servers are known to set incorrect
1723                  * CountHigh values.
1724                  */
1725                 if (written > wdata->bytes)
1726                         written &= 0xFFFF;
1727
1728                 if (written < wdata->bytes)
1729                         wdata->result = -ENOSPC;
1730                 else
1731                         wdata->bytes = written;
1732                 break;
1733         case MID_REQUEST_SUBMITTED:
1734         case MID_RETRY_NEEDED:
1735                 wdata->result = -EAGAIN;
1736                 break;
1737         default:
1738                 wdata->result = -EIO;
1739                 break;
1740         }
1741
1742         if (wdata->result)
1743                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1744
1745         queue_work(cifsiod_wq, &wdata->work);
1746         DeleteMidQEntry(mid);
1747         add_credits(tcon->ses->server, credits_received, 0);
1748 }
1749
1750 /* smb2_async_writev - send an async write, and set up mid to handle result */
1751 int
1752 smb2_async_writev(struct cifs_writedata *wdata)
1753 {
1754         int rc = -EACCES;
1755         struct smb2_write_req *req = NULL;
1756         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1757         struct kvec iov;
1758         struct smb_rqst rqst;
1759
1760         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1761         if (rc)
1762                 goto async_writev_out;
1763
1764         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1765
1766         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1767         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1768         req->WriteChannelInfoOffset = 0;
1769         req->WriteChannelInfoLength = 0;
1770         req->Channel = 0;
1771         req->Offset = cpu_to_le64(wdata->offset);
1772         /* 4 for rfc1002 length field */
1773         req->DataOffset = cpu_to_le16(
1774                                 offsetof(struct smb2_write_req, Buffer) - 4);
1775         req->RemainingBytes = 0;
1776
1777         /* 4 for rfc1002 length field and 1 for Buffer */
1778         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1779         iov.iov_base = req;
1780
1781         rqst.rq_iov = &iov;
1782         rqst.rq_nvec = 1;
1783         rqst.rq_pages = wdata->pages;
1784         rqst.rq_npages = wdata->nr_pages;
1785         rqst.rq_pagesz = wdata->pagesz;
1786         rqst.rq_tailsz = wdata->tailsz;
1787
1788         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1789                  wdata->offset, wdata->bytes);
1790
1791         req->Length = cpu_to_le32(wdata->bytes);
1792
1793         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1794
1795         kref_get(&wdata->refcount);
1796         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1797                                 smb2_writev_callback, wdata, 0);
1798
1799         if (rc) {
1800                 kref_put(&wdata->refcount, cifs_writedata_release);
1801                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1802         }
1803
1804 async_writev_out:
1805         cifs_small_buf_release(req);
1806         return rc;
1807 }
1808
1809 /*
1810  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1811  * The length field from io_parms must be at least 1 and indicates a number of
1812  * elements with data to write that begins with position 1 in iov array. All
1813  * data length is specified by count.
1814  */
1815 int
1816 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1817            unsigned int *nbytes, struct kvec *iov, int n_vec)
1818 {
1819         int rc = 0;
1820         struct smb2_write_req *req = NULL;
1821         struct smb2_write_rsp *rsp = NULL;
1822         int resp_buftype;
1823         *nbytes = 0;
1824
1825         if (n_vec < 1)
1826                 return rc;
1827
1828         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1829         if (rc)
1830                 return rc;
1831
1832         if (io_parms->tcon->ses->server == NULL)
1833                 return -ECONNABORTED;
1834
1835         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1836
1837         req->PersistentFileId = io_parms->persistent_fid;
1838         req->VolatileFileId = io_parms->volatile_fid;
1839         req->WriteChannelInfoOffset = 0;
1840         req->WriteChannelInfoLength = 0;
1841         req->Channel = 0;
1842         req->Length = cpu_to_le32(io_parms->length);
1843         req->Offset = cpu_to_le64(io_parms->offset);
1844         /* 4 for rfc1002 length field */
1845         req->DataOffset = cpu_to_le16(
1846                                 offsetof(struct smb2_write_req, Buffer) - 4);
1847         req->RemainingBytes = 0;
1848
1849         iov[0].iov_base = (char *)req;
1850         /* 4 for rfc1002 length field and 1 for Buffer */
1851         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1852
1853         /* length of entire message including data to be written */
1854         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1855
1856         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1857                           &resp_buftype, 0);
1858         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1859
1860         if (rc) {
1861                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1862                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1863         } else
1864                 *nbytes = le32_to_cpu(rsp->DataLength);
1865
1866         free_rsp_buf(resp_buftype, rsp);
1867         return rc;
1868 }
1869
1870 static unsigned int
1871 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1872 {
1873         int len;
1874         unsigned int entrycount = 0;
1875         unsigned int next_offset = 0;
1876         FILE_DIRECTORY_INFO *entryptr;
1877
1878         if (bufstart == NULL)
1879                 return 0;
1880
1881         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1882
1883         while (1) {
1884                 entryptr = (FILE_DIRECTORY_INFO *)
1885                                         ((char *)entryptr + next_offset);
1886
1887                 if ((char *)entryptr + size > end_of_buf) {
1888                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1889                         break;
1890                 }
1891
1892                 len = le32_to_cpu(entryptr->FileNameLength);
1893                 if ((char *)entryptr + len + size > end_of_buf) {
1894                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1895                                  end_of_buf);
1896                         break;
1897                 }
1898
1899                 *lastentry = (char *)entryptr;
1900                 entrycount++;
1901
1902                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1903                 if (!next_offset)
1904                         break;
1905         }
1906
1907         return entrycount;
1908 }
1909
1910 /*
1911  * Readdir/FindFirst
1912  */
1913 int
1914 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1915                      u64 persistent_fid, u64 volatile_fid, int index,
1916                      struct cifs_search_info *srch_inf)
1917 {
1918         struct smb2_query_directory_req *req;
1919         struct smb2_query_directory_rsp *rsp = NULL;
1920         struct kvec iov[2];
1921         int rc = 0;
1922         int len;
1923         int resp_buftype;
1924         unsigned char *bufptr;
1925         struct TCP_Server_Info *server;
1926         struct cifs_ses *ses = tcon->ses;
1927         __le16 asteriks = cpu_to_le16('*');
1928         char *end_of_smb;
1929         unsigned int output_size = CIFSMaxBufSize;
1930         size_t info_buf_size;
1931
1932         if (ses && (ses->server))
1933                 server = ses->server;
1934         else
1935                 return -EIO;
1936
1937         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1938         if (rc)
1939                 return rc;
1940
1941         switch (srch_inf->info_level) {
1942         case SMB_FIND_FILE_DIRECTORY_INFO:
1943                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1944                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1945                 break;
1946         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1947                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1948                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1949                 break;
1950         default:
1951                 cifs_dbg(VFS, "info level %u isn't supported\n",
1952                          srch_inf->info_level);
1953                 rc = -EINVAL;
1954                 goto qdir_exit;
1955         }
1956
1957         req->FileIndex = cpu_to_le32(index);
1958         req->PersistentFileId = persistent_fid;
1959         req->VolatileFileId = volatile_fid;
1960
1961         len = 0x2;
1962         bufptr = req->Buffer;
1963         memcpy(bufptr, &asteriks, len);
1964
1965         req->FileNameOffset =
1966                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1967         req->FileNameLength = cpu_to_le16(len);
1968         /*
1969          * BB could be 30 bytes or so longer if we used SMB2 specific
1970          * buffer lengths, but this is safe and close enough.
1971          */
1972         output_size = min_t(unsigned int, output_size, server->maxBuf);
1973         output_size = min_t(unsigned int, output_size, 2 << 15);
1974         req->OutputBufferLength = cpu_to_le32(output_size);
1975
1976         iov[0].iov_base = (char *)req;
1977         /* 4 for RFC1001 length and 1 for Buffer */
1978         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1979
1980         iov[1].iov_base = (char *)(req->Buffer);
1981         iov[1].iov_len = len;
1982
1983         inc_rfc1001_len(req, len - 1 /* Buffer */);
1984
1985         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1986         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1987
1988         if (rc) {
1989                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1990                 goto qdir_exit;
1991         }
1992
1993         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1994                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1995                           info_buf_size);
1996         if (rc)
1997                 goto qdir_exit;
1998
1999         srch_inf->unicode = true;
2000
2001         if (srch_inf->ntwrk_buf_start) {
2002                 if (srch_inf->smallBuf)
2003                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2004                 else
2005                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2006         }
2007         srch_inf->ntwrk_buf_start = (char *)rsp;
2008         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2009                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2010         /* 4 for rfc1002 length field */
2011         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2012         srch_inf->entries_in_buffer =
2013                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2014                                     &srch_inf->last_entry, info_buf_size);
2015         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2016         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2017                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2018                  srch_inf->srch_entries_start, srch_inf->last_entry);
2019         if (resp_buftype == CIFS_LARGE_BUFFER)
2020                 srch_inf->smallBuf = false;
2021         else if (resp_buftype == CIFS_SMALL_BUFFER)
2022                 srch_inf->smallBuf = true;
2023         else
2024                 cifs_dbg(VFS, "illegal search buffer type\n");
2025
2026         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2027                 srch_inf->endOfSearch = 1;
2028         else
2029                 srch_inf->endOfSearch = 0;
2030
2031         return rc;
2032
2033 qdir_exit:
2034         free_rsp_buf(resp_buftype, rsp);
2035         return rc;
2036 }
2037
2038 static int
2039 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2040                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2041                unsigned int num, void **data, unsigned int *size)
2042 {
2043         struct smb2_set_info_req *req;
2044         struct smb2_set_info_rsp *rsp = NULL;
2045         struct kvec *iov;
2046         int rc = 0;
2047         int resp_buftype;
2048         unsigned int i;
2049         struct TCP_Server_Info *server;
2050         struct cifs_ses *ses = tcon->ses;
2051
2052         if (ses && (ses->server))
2053                 server = ses->server;
2054         else
2055                 return -EIO;
2056
2057         if (!num)
2058                 return -EINVAL;
2059
2060         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2061         if (!iov)
2062                 return -ENOMEM;
2063
2064         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2065         if (rc) {
2066                 kfree(iov);
2067                 return rc;
2068         }
2069
2070         req->hdr.ProcessId = cpu_to_le32(pid);
2071
2072         req->InfoType = SMB2_O_INFO_FILE;
2073         req->FileInfoClass = info_class;
2074         req->PersistentFileId = persistent_fid;
2075         req->VolatileFileId = volatile_fid;
2076
2077         /* 4 for RFC1001 length and 1 for Buffer */
2078         req->BufferOffset =
2079                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2080         req->BufferLength = cpu_to_le32(*size);
2081
2082         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2083
2084         memcpy(req->Buffer, *data, *size);
2085
2086         iov[0].iov_base = (char *)req;
2087         /* 4 for RFC1001 length */
2088         iov[0].iov_len = get_rfc1002_length(req) + 4;
2089
2090         for (i = 1; i < num; i++) {
2091                 inc_rfc1001_len(req, size[i]);
2092                 le32_add_cpu(&req->BufferLength, size[i]);
2093                 iov[i].iov_base = (char *)data[i];
2094                 iov[i].iov_len = size[i];
2095         }
2096
2097         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2098         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2099
2100         if (rc != 0) {
2101                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2102                 goto out;
2103         }
2104 out:
2105         free_rsp_buf(resp_buftype, rsp);
2106         kfree(iov);
2107         return rc;
2108 }
2109
2110 int
2111 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2112             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2113 {
2114         struct smb2_file_rename_info info;
2115         void **data;
2116         unsigned int size[2];
2117         int rc;
2118         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2119
2120         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2121         if (!data)
2122                 return -ENOMEM;
2123
2124         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2125                               /* 0 = fail if target already exists */
2126         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2127         info.FileNameLength = cpu_to_le32(len);
2128
2129         data[0] = &info;
2130         size[0] = sizeof(struct smb2_file_rename_info);
2131
2132         data[1] = target_file;
2133         size[1] = len + 2 /* null */;
2134
2135         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2136                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2137                            size);
2138         kfree(data);
2139         return rc;
2140 }
2141
2142 int
2143 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2144                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2145 {
2146         struct smb2_file_link_info info;
2147         void **data;
2148         unsigned int size[2];
2149         int rc;
2150         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2151
2152         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2153         if (!data)
2154                 return -ENOMEM;
2155
2156         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2157                               /* 0 = fail if link already exists */
2158         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2159         info.FileNameLength = cpu_to_le32(len);
2160
2161         data[0] = &info;
2162         size[0] = sizeof(struct smb2_file_link_info);
2163
2164         data[1] = target_file;
2165         size[1] = len + 2 /* null */;
2166
2167         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2168                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2169         kfree(data);
2170         return rc;
2171 }
2172
2173 int
2174 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2175              u64 volatile_fid, u32 pid, __le64 *eof)
2176 {
2177         struct smb2_file_eof_info info;
2178         void *data;
2179         unsigned int size;
2180
2181         info.EndOfFile = *eof;
2182
2183         data = &info;
2184         size = sizeof(struct smb2_file_eof_info);
2185
2186         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2187                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2188 }
2189
2190 int
2191 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2192               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2193 {
2194         unsigned int size;
2195         size = sizeof(FILE_BASIC_INFO);
2196         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2197                              current->tgid, FILE_BASIC_INFORMATION, 1,
2198                              (void **)&buf, &size);
2199 }
2200
2201 int
2202 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2203                   const u64 persistent_fid, const u64 volatile_fid,
2204                   __u8 oplock_level)
2205 {
2206         int rc;
2207         struct smb2_oplock_break *req = NULL;
2208
2209         cifs_dbg(FYI, "SMB2_oplock_break\n");
2210         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2211
2212         if (rc)
2213                 return rc;
2214
2215         req->VolatileFid = volatile_fid;
2216         req->PersistentFid = persistent_fid;
2217         req->OplockLevel = oplock_level;
2218         req->hdr.CreditRequest = cpu_to_le16(1);
2219
2220         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2221         /* SMB2 buffer freed by function above */
2222
2223         if (rc) {
2224                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2225                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2226         }
2227
2228         return rc;
2229 }
2230
2231 static void
2232 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2233                         struct kstatfs *kst)
2234 {
2235         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2236                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2237         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2238         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2239         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2240         return;
2241 }
2242
2243 static int
2244 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2245                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2246 {
2247         int rc;
2248         struct smb2_query_info_req *req;
2249
2250         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2251
2252         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2253                 return -EIO;
2254
2255         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2256         if (rc)
2257                 return rc;
2258
2259         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2260         req->FileInfoClass = level;
2261         req->PersistentFileId = persistent_fid;
2262         req->VolatileFileId = volatile_fid;
2263         /* 4 for rfc1002 length field and 1 for pad */
2264         req->InputBufferOffset =
2265                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2266         req->OutputBufferLength = cpu_to_le32(
2267                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2268
2269         iov->iov_base = (char *)req;
2270         /* 4 for rfc1002 length field */
2271         iov->iov_len = get_rfc1002_length(req) + 4;
2272         return 0;
2273 }
2274
2275 int
2276 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2277               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2278 {
2279         struct smb2_query_info_rsp *rsp = NULL;
2280         struct kvec iov;
2281         int rc = 0;
2282         int resp_buftype;
2283         struct cifs_ses *ses = tcon->ses;
2284         struct smb2_fs_full_size_info *info = NULL;
2285
2286         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2287                                 sizeof(struct smb2_fs_full_size_info),
2288                                 persistent_fid, volatile_fid);
2289         if (rc)
2290                 return rc;
2291
2292         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2293         if (rc) {
2294                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2295                 goto qinf_exit;
2296         }
2297         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2298
2299         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2300                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2301         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2302                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2303                           sizeof(struct smb2_fs_full_size_info));
2304         if (!rc)
2305                 copy_fs_info_to_kstatfs(info, fsdata);
2306
2307 qinf_exit:
2308         free_rsp_buf(resp_buftype, iov.iov_base);
2309         return rc;
2310 }
2311
2312 int
2313 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2314            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2315            const __u32 num_lock, struct smb2_lock_element *buf)
2316 {
2317         int rc = 0;
2318         struct smb2_lock_req *req = NULL;
2319         struct kvec iov[2];
2320         int resp_buf_type;
2321         unsigned int count;
2322
2323         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2324
2325         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2326         if (rc)
2327                 return rc;
2328
2329         req->hdr.ProcessId = cpu_to_le32(pid);
2330         req->LockCount = cpu_to_le16(num_lock);
2331
2332         req->PersistentFileId = persist_fid;
2333         req->VolatileFileId = volatile_fid;
2334
2335         count = num_lock * sizeof(struct smb2_lock_element);
2336         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2337
2338         iov[0].iov_base = (char *)req;
2339         /* 4 for rfc1002 length field and count for all locks */
2340         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2341         iov[1].iov_base = (char *)buf;
2342         iov[1].iov_len = count;
2343
2344         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2345         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2346         if (rc) {
2347                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2348                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2349         }
2350
2351         return rc;
2352 }
2353
2354 int
2355 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2356           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2357           const __u64 length, const __u64 offset, const __u32 lock_flags,
2358           const bool wait)
2359 {
2360         struct smb2_lock_element lock;
2361
2362         lock.Offset = cpu_to_le64(offset);
2363         lock.Length = cpu_to_le64(length);
2364         lock.Flags = cpu_to_le32(lock_flags);
2365         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2366                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2367
2368         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2369 }
2370
2371 int
2372 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2373                  __u8 *lease_key, const __le32 lease_state)
2374 {
2375         int rc;
2376         struct smb2_lease_ack *req = NULL;
2377
2378         cifs_dbg(FYI, "SMB2_lease_break\n");
2379         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2380
2381         if (rc)
2382                 return rc;
2383
2384         req->hdr.CreditRequest = cpu_to_le16(1);
2385         req->StructureSize = cpu_to_le16(36);
2386         inc_rfc1001_len(req, 12);
2387
2388         memcpy(req->LeaseKey, lease_key, 16);
2389         req->LeaseState = lease_state;
2390
2391         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2392         /* SMB2 buffer freed by function above */
2393
2394         if (rc) {
2395                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2396                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2397         }
2398
2399         return rc;
2400 }