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         /* no need to send SMB logoff if uid already closed due to reconnect */
 691         if (ses->need_reconnect)
 692                 goto smb2_session_already_dead;
 693
 694         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 695         if (rc)
 696                 return rc;
 697
 698          /* since no tcon, smb2_init can not do this, so do here */
 699         req->hdr.SessionId = ses->Suid;
 700         if (server->sign)
 701                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 702
 703         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 704         /*
 705          * No tcon so can't do
 706          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 707          */
 708
 709 smb2_session_already_dead:
 710         return rc;
 711 }
 712
 713 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 714 {
 715         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 716 }
 717
 718 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 719
 720 int
 721 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 722           struct cifs_tcon *tcon, const struct nls_table *cp)
 723 {
 724         struct smb2_tree_connect_req *req;
 725         struct smb2_tree_connect_rsp *rsp = NULL;
 726         struct kvec iov[2];
 727         int rc = 0;
 728         int resp_buftype;
 729         int unc_path_len;
 730         struct TCP_Server_Info *server;
 731         __le16 *unc_path = NULL;
 732
 733         cifs_dbg(FYI, "TCON\n");
 734
 735         if ((ses->server) && tree)
 736                 server = ses->server;
 737         else
 738                 return -EIO;
 739
 740         if (tcon && tcon->bad_network_name)
 741                 return -ENOENT;
 742
 743         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 744         if (unc_path == NULL)
 745                 return -ENOMEM;
 746
 747         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 748         unc_path_len *= 2;
 749         if (unc_path_len < 2) {
 750                 kfree(unc_path);
 751                 return -EINVAL;
 752         }
 753
 754         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 755         if (rc) {
 756                 kfree(unc_path);
 757                 return rc;
 758         }
 759
 760         if (tcon == NULL) {
 761                 /* since no tcon, smb2_init can not do this, so do here */
 762                 req->hdr.SessionId = ses->Suid;
 763                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 764                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 765         }
 766
 767         iov[0].iov_base = (char *)req;
 768         /* 4 for rfc1002 length field and 1 for pad */
 769         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 770
 771         /* Testing shows that buffer offset must be at location of Buffer[0] */
 772         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 773                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 774         req->PathLength = cpu_to_le16(unc_path_len - 2);
 775         iov[1].iov_base = unc_path;
 776         iov[1].iov_len = unc_path_len;
 777
 778         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 779
 780         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 781         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 782
 783         if (rc != 0) {
 784                 if (tcon) {
 785                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 786                         tcon->need_reconnect = true;
 787                 }
 788                 goto tcon_error_exit;
 789         }
 790
 791         if (tcon == NULL) {
 792                 ses->ipc_tid = rsp->hdr.TreeId;
 793                 goto tcon_exit;
 794         }
 795
 796         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 797                 cifs_dbg(FYI, "connection to disk share\n");
 798         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 799                 tcon->ipc = true;
 800                 cifs_dbg(FYI, "connection to pipe share\n");
 801         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 802                 tcon->print = true;
 803                 cifs_dbg(FYI, "connection to printer\n");
 804         } else {
 805                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 806                 rc = -EOPNOTSUPP;
 807                 goto tcon_error_exit;
 808         }
 809
 810         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 811         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 812         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 813         tcon->tidStatus = CifsGood;
 814         tcon->need_reconnect = false;
 815         tcon->tid = rsp->hdr.TreeId;
 816         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 817
 818         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 819             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 820                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 821
 822 tcon_exit:
 823         free_rsp_buf(resp_buftype, rsp);
 824         kfree(unc_path);
 825         return rc;
 826
 827 tcon_error_exit:
 828         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 829                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 830                 tcon->bad_network_name = true;
 831         }
 832         goto tcon_exit;
 833 }
 834
 835 int
 836 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 837 {
 838         struct smb2_tree_disconnect_req *req; /* response is trivial */
 839         int rc = 0;
 840         struct TCP_Server_Info *server;
 841         struct cifs_ses *ses = tcon->ses;
 842
 843         cifs_dbg(FYI, "Tree Disconnect\n");
 844
 845         if (ses && (ses->server))
 846                 server = ses->server;
 847         else
 848                 return -EIO;
 849
 850         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 851                 return 0;
 852
 853         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 854         if (rc)
 855                 return rc;
 856
 857         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 858         if (rc)
 859                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 860
 861         return rc;
 862 }
 863
 864
 865 static struct create_durable *
 866 create_durable_buf(void)
 867 {
 868         struct create_durable *buf;
 869
 870         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 871         if (!buf)
 872                 return NULL;
 873
 874         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 875                                         (struct create_durable, Data));
 876         buf->ccontext.DataLength = cpu_to_le32(16);
 877         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 878                                 (struct create_durable, Name));
 879         buf->ccontext.NameLength = cpu_to_le16(4);
 880         buf->Name[0] = 'D';
 881         buf->Name[1] = 'H';
 882         buf->Name[2] = 'n';
 883         buf->Name[3] = 'Q';
 884         return buf;
 885 }
 886
 887 static struct create_durable *
 888 create_reconnect_durable_buf(struct cifs_fid *fid)
 889 {
 890         struct create_durable *buf;
 891
 892         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 893         if (!buf)
 894                 return NULL;
 895
 896         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 897                                         (struct create_durable, Data));
 898         buf->ccontext.DataLength = cpu_to_le32(16);
 899         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 900                                 (struct create_durable, Name));
 901         buf->ccontext.NameLength = cpu_to_le16(4);
 902         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 903         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 904         buf->Name[0] = 'D';
 905         buf->Name[1] = 'H';
 906         buf->Name[2] = 'n';
 907         buf->Name[3] = 'C';
 908         return buf;
 909 }
 910
 911 static __u8
 912 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
 913                   unsigned int *epoch)
 914 {
 915         char *data_offset;
 916         struct create_context *cc;
 917         unsigned int next = 0;
 918         char *name;
 919
 920         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 921         cc = (struct create_context *)data_offset;
 922         do {
 923                 cc = (struct create_context *)((char *)cc + next);
 924                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
 925                 if (le16_to_cpu(cc->NameLength) != 4 ||
 926                     strncmp(name, "RqLs", 4)) {
 927                         next = le32_to_cpu(cc->Next);
 928                         continue;
 929                 }
 930                 return server->ops->parse_lease_buf(cc, epoch);
 931         } while (next != 0);
 932
 933         return 0;
 934 }
 935
 936 static int
 937 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
 938                   unsigned int *num_iovec, __u8 *oplock)
 939 {
 940         struct smb2_create_req *req = iov[0].iov_base;
 941         unsigned int num = *num_iovec;
 942
 943         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
 944         if (iov[num].iov_base == NULL)
 945                 return -ENOMEM;
 946         iov[num].iov_len = server->vals->create_lease_size;
 947         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 948         if (!req->CreateContextsOffset)
 949                 req->CreateContextsOffset = cpu_to_le32(
 950                                 sizeof(struct smb2_create_req) - 4 +
 951                                 iov[num - 1].iov_len);
 952         le32_add_cpu(&req->CreateContextsLength,
 953                      server->vals->create_lease_size);
 954         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
 955         *num_iovec = num + 1;
 956         return 0;
 957 }
 958
 959 static int
 960 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 961                     struct cifs_open_parms *oparms)
 962 {
 963         struct smb2_create_req *req = iov[0].iov_base;
 964         unsigned int num = *num_iovec;
 965
 966         if (oparms->reconnect) {
 967                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 968                 /* indicate that we don't need to relock the file */
 969                 oparms->reconnect = false;
 970         } else
 971                 iov[num].iov_base = create_durable_buf();
 972         if (iov[num].iov_base == NULL)
 973                 return -ENOMEM;
 974         iov[num].iov_len = sizeof(struct create_durable);
 975         if (!req->CreateContextsOffset)
 976                 req->CreateContextsOffset =
 977                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 978                                                                 iov[1].iov_len);
 979         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
 980         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
 981         *num_iovec = num + 1;
 982         return 0;
 983 }
 984
 985 int
 986 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
 987           __u8 *oplock, struct smb2_file_all_info *buf,
 988           struct smb2_err_rsp **err_buf)
 989 {
 990         struct smb2_create_req *req;
 991         struct smb2_create_rsp *rsp;
 992         struct TCP_Server_Info *server;
 993         struct cifs_tcon *tcon = oparms->tcon;
 994         struct cifs_ses *ses = tcon->ses;
 995         struct kvec iov[4];
 996         int resp_buftype;
 997         int uni_path_len;
 998         __le16 *copy_path = NULL;
 999         int copy_size;
1000         int rc = 0;
1001         unsigned int num_iovecs = 2;
1002         __u32 file_attributes = 0;
1003
1004         cifs_dbg(FYI, "create/open\n");
1005
1006         if (ses && (ses->server))
1007                 server = ses->server;
1008         else
1009                 return -EIO;
1010
1011         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1012         if (rc)
1013                 return rc;
1014
1015         if (oparms->create_options & CREATE_OPTION_READONLY)
1016                 file_attributes |= ATTR_READONLY;
1017
1018         req->ImpersonationLevel = IL_IMPERSONATION;
1019         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1020         /* File attributes ignored on open (used in create though) */
1021         req->FileAttributes = cpu_to_le32(file_attributes);
1022         req->ShareAccess = FILE_SHARE_ALL_LE;
1023         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1024         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1025         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1026         /* do not count rfc1001 len field */
1027         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1028
1029         iov[0].iov_base = (char *)req;
1030         /* 4 for rfc1002 length field */
1031         iov[0].iov_len = get_rfc1002_length(req) + 4;
1032
1033         /* MUST set path len (NameLength) to 0 opening root of share */
1034         req->NameLength = cpu_to_le16(uni_path_len - 2);
1035         /* -1 since last byte is buf[0] which is sent below (path) */
1036         iov[0].iov_len--;
1037         if (uni_path_len % 8 != 0) {
1038                 copy_size = uni_path_len / 8 * 8;
1039                 if (copy_size < uni_path_len)
1040                         copy_size += 8;
1041
1042                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1043                 if (!copy_path)
1044                         return -ENOMEM;
1045                 memcpy((char *)copy_path, (const char *)path,
1046                         uni_path_len);
1047                 uni_path_len = copy_size;
1048                 path = copy_path;
1049         }
1050
1051         iov[1].iov_len = uni_path_len;
1052         iov[1].iov_base = path;
1053         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1054         inc_rfc1001_len(req, uni_path_len - 1);
1055
1056         if (!server->oplocks)
1057                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1058
1059         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1060             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1061                 req->RequestedOplockLevel = *oplock;
1062         else {
1063                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1064                 if (rc) {
1065                         cifs_small_buf_release(req);
1066                         kfree(copy_path);
1067                         return rc;
1068                 }
1069         }
1070
1071         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1072                 /* need to set Next field of lease context if we request it */
1073                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1074                         struct create_context *ccontext =
1075                             (struct create_context *)iov[num_iovecs-1].iov_base;
1076                         ccontext->Next =
1077                                 cpu_to_le32(server->vals->create_lease_size);
1078                 }
1079                 rc = add_durable_context(iov, &num_iovecs, oparms);
1080                 if (rc) {
1081                         cifs_small_buf_release(req);
1082                         kfree(copy_path);
1083                         kfree(iov[num_iovecs-1].iov_base);
1084                         return rc;
1085                 }
1086         }
1087
1088         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1089         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1090
1091         if (rc != 0) {
1092                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1093                 if (err_buf)
1094                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1095                                            GFP_KERNEL);
1096                 goto creat_exit;
1097         }
1098
1099         oparms->fid->persistent_fid = rsp->PersistentFileId;
1100         oparms->fid->volatile_fid = rsp->VolatileFileId;
1101
1102         if (buf) {
1103                 memcpy(buf, &rsp->CreationTime, 32);
1104                 buf->AllocationSize = rsp->AllocationSize;
1105                 buf->EndOfFile = rsp->EndofFile;
1106                 buf->Attributes = rsp->FileAttributes;
1107                 buf->NumberOfLinks = cpu_to_le32(1);
1108                 buf->DeletePending = 0;
1109         }
1110
1111         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1112                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1113         else
1114                 *oplock = rsp->OplockLevel;
1115 creat_exit:
1116         kfree(copy_path);
1117         free_rsp_buf(resp_buftype, rsp);
1118         return rc;
1119 }
1120
1121 /*
1122  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1123  */
1124 int
1125 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1126            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1127            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1128 {
1129         struct smb2_ioctl_req *req;
1130         struct smb2_ioctl_rsp *rsp;
1131         struct TCP_Server_Info *server;
1132         struct cifs_ses *ses = tcon->ses;
1133         struct kvec iov[2];
1134         int resp_buftype;
1135         int num_iovecs;
1136         int rc = 0;
1137
1138         cifs_dbg(FYI, "SMB2 IOCTL\n");
1139
1140         /* zero out returned data len, in case of error */
1141         if (plen)
1142                 *plen = 0;
1143
1144         if (ses && (ses->server))
1145                 server = ses->server;
1146         else
1147                 return -EIO;
1148
1149         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1150         if (rc)
1151                 return rc;
1152
1153         req->CtlCode = cpu_to_le32(opcode);
1154         req->PersistentFileId = persistent_fid;
1155         req->VolatileFileId = volatile_fid;
1156
1157         if (indatalen) {
1158                 req->InputCount = cpu_to_le32(indatalen);
1159                 /* do not set InputOffset if no input data */
1160                 req->InputOffset =
1161                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1162                 iov[1].iov_base = in_data;
1163                 iov[1].iov_len = indatalen;
1164                 num_iovecs = 2;
1165         } else
1166                 num_iovecs = 1;
1167
1168         req->OutputOffset = 0;
1169         req->OutputCount = 0; /* MBZ */
1170
1171         /*
1172          * Could increase MaxOutputResponse, but that would require more
1173          * than one credit. Windows typically sets this smaller, but for some
1174          * ioctls it may be useful to allow server to send more. No point
1175          * limiting what the server can send as long as fits in one credit
1176          */
1177         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1178
1179         if (is_fsctl)
1180                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1181         else
1182                 req->Flags = 0;
1183
1184         iov[0].iov_base = (char *)req;
1185         /* 4 for rfc1002 length field */
1186         iov[0].iov_len = get_rfc1002_length(req) + 4;
1187
1188         if (indatalen)
1189                 inc_rfc1001_len(req, indatalen);
1190
1191         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1192         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1193
1194         if (rc != 0) {
1195                 if (tcon)
1196                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1197                 goto ioctl_exit;
1198         }
1199
1200         /* check if caller wants to look at return data or just return rc */
1201         if ((plen == NULL) || (out_data == NULL))
1202                 goto ioctl_exit;
1203
1204         *plen = le32_to_cpu(rsp->OutputCount);
1205
1206         /* We check for obvious errors in the output buffer length and offset */
1207         if (*plen == 0)
1208                 goto ioctl_exit; /* server returned no data */
1209         else if (*plen > 0xFF00) {
1210                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1211                 *plen = 0;
1212                 rc = -EIO;
1213                 goto ioctl_exit;
1214         }
1215
1216         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1217                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1218                         le32_to_cpu(rsp->OutputOffset));
1219                 *plen = 0;
1220                 rc = -EIO;
1221                 goto ioctl_exit;
1222         }
1223
1224         *out_data = kmalloc(*plen, GFP_KERNEL);
1225         if (*out_data == NULL) {
1226                 rc = -ENOMEM;
1227                 goto ioctl_exit;
1228         }
1229
1230         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1231                *plen);
1232 ioctl_exit:
1233         free_rsp_buf(resp_buftype, rsp);
1234         return rc;
1235 }
1236
1237 int
1238 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1239            u64 persistent_fid, u64 volatile_fid)
1240 {
1241         struct smb2_close_req *req;
1242         struct smb2_close_rsp *rsp;
1243         struct TCP_Server_Info *server;
1244         struct cifs_ses *ses = tcon->ses;
1245         struct kvec iov[1];
1246         int resp_buftype;
1247         int rc = 0;
1248
1249         cifs_dbg(FYI, "Close\n");
1250
1251         if (ses && (ses->server))
1252                 server = ses->server;
1253         else
1254                 return -EIO;
1255
1256         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1257         if (rc)
1258                 return rc;
1259
1260         req->PersistentFileId = persistent_fid;
1261         req->VolatileFileId = volatile_fid;
1262
1263         iov[0].iov_base = (char *)req;
1264         /* 4 for rfc1002 length field */
1265         iov[0].iov_len = get_rfc1002_length(req) + 4;
1266
1267         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1268         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1269
1270         if (rc != 0) {
1271                 if (tcon)
1272                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1273                 goto close_exit;
1274         }
1275
1276         /* BB FIXME - decode close response, update inode for caching */
1277
1278 close_exit:
1279         free_rsp_buf(resp_buftype, rsp);
1280         return rc;
1281 }
1282
1283 static int
1284 validate_buf(unsigned int offset, unsigned int buffer_length,
1285              struct smb2_hdr *hdr, unsigned int min_buf_size)
1286
1287 {
1288         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1289         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1290         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1291         char *end_of_buf = begin_of_buf + buffer_length;
1292
1293
1294         if (buffer_length < min_buf_size) {
1295                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1296                          buffer_length, min_buf_size);
1297                 return -EINVAL;
1298         }
1299
1300         /* check if beyond RFC1001 maximum length */
1301         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1302                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1303                          buffer_length, smb_len);
1304                 return -EINVAL;
1305         }
1306
1307         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1308                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1309                 return -EINVAL;
1310         }
1311
1312         return 0;
1313 }
1314
1315 /*
1316  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1317  * Caller must free buffer.
1318  */
1319 static int
1320 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1321                       struct smb2_hdr *hdr, unsigned int minbufsize,
1322                       char *data)
1323
1324 {
1325         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1326         int rc;
1327
1328         if (!data)
1329                 return -EINVAL;
1330
1331         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1332         if (rc)
1333                 return rc;
1334
1335         memcpy(data, begin_of_buf, buffer_length);
1336
1337         return 0;
1338 }
1339
1340 static int
1341 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1342            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1343            size_t output_len, size_t min_len, void *data)
1344 {
1345         struct smb2_query_info_req *req;
1346         struct smb2_query_info_rsp *rsp = NULL;
1347         struct kvec iov[2];
1348         int rc = 0;
1349         int resp_buftype;
1350         struct TCP_Server_Info *server;
1351         struct cifs_ses *ses = tcon->ses;
1352
1353         cifs_dbg(FYI, "Query Info\n");
1354
1355         if (ses && (ses->server))
1356                 server = ses->server;
1357         else
1358                 return -EIO;
1359
1360         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1361         if (rc)
1362                 return rc;
1363
1364         req->InfoType = SMB2_O_INFO_FILE;
1365         req->FileInfoClass = info_class;
1366         req->PersistentFileId = persistent_fid;
1367         req->VolatileFileId = volatile_fid;
1368         /* 4 for rfc1002 length field and 1 for Buffer */
1369         req->InputBufferOffset =
1370                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1371         req->OutputBufferLength = cpu_to_le32(output_len);
1372
1373         iov[0].iov_base = (char *)req;
1374         /* 4 for rfc1002 length field */
1375         iov[0].iov_len = get_rfc1002_length(req) + 4;
1376
1377         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1378         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1379
1380         if (rc) {
1381                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1382                 goto qinf_exit;
1383         }
1384
1385         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1386                                    le32_to_cpu(rsp->OutputBufferLength),
1387                                    &rsp->hdr, min_len, data);
1388
1389 qinf_exit:
1390         free_rsp_buf(resp_buftype, rsp);
1391         return rc;
1392 }
1393
1394 int
1395 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1396                 u64 persistent_fid, u64 volatile_fid,
1397                 struct smb2_file_all_info *data)
1398 {
1399         return query_info(xid, tcon, persistent_fid, volatile_fid,
1400                           FILE_ALL_INFORMATION,
1401                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1402                           sizeof(struct smb2_file_all_info), data);
1403 }
1404
1405 int
1406 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1407                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1408 {
1409         return query_info(xid, tcon, persistent_fid, volatile_fid,
1410                           FILE_INTERNAL_INFORMATION,
1411                           sizeof(struct smb2_file_internal_info),
1412                           sizeof(struct smb2_file_internal_info), uniqueid);
1413 }
1414
1415 /*
1416  * This is a no-op for now. We're not really interested in the reply, but
1417  * rather in the fact that the server sent one and that server->lstrp
1418  * gets updated.
1419  *
1420  * FIXME: maybe we should consider checking that the reply matches request?
1421  */
1422 static void
1423 smb2_echo_callback(struct mid_q_entry *mid)
1424 {
1425         struct TCP_Server_Info *server = mid->callback_data;
1426         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1427         unsigned int credits_received = 1;
1428
1429         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1430                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1431
1432         DeleteMidQEntry(mid);
1433         add_credits(server, credits_received, CIFS_ECHO_OP);
1434 }
1435
1436 int
1437 SMB2_echo(struct TCP_Server_Info *server)
1438 {
1439         struct smb2_echo_req *req;
1440         int rc = 0;
1441         struct kvec iov;
1442         struct smb_rqst rqst = { .rq_iov = &iov,
1443                                  .rq_nvec = 1 };
1444
1445         cifs_dbg(FYI, "In echo request\n");
1446
1447         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1448         if (rc)
1449                 return rc;
1450
1451         req->hdr.CreditRequest = cpu_to_le16(1);
1452
1453         iov.iov_base = (char *)req;
1454         /* 4 for rfc1002 length field */
1455         iov.iov_len = get_rfc1002_length(req) + 4;
1456
1457         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1458                              CIFS_ECHO_OP);
1459         if (rc)
1460                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1461
1462         cifs_small_buf_release(req);
1463         return rc;
1464 }
1465
1466 int
1467 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1468            u64 volatile_fid)
1469 {
1470         struct smb2_flush_req *req;
1471         struct TCP_Server_Info *server;
1472         struct cifs_ses *ses = tcon->ses;
1473         struct kvec iov[1];
1474         int resp_buftype;
1475         int rc = 0;
1476
1477         cifs_dbg(FYI, "Flush\n");
1478
1479         if (ses && (ses->server))
1480                 server = ses->server;
1481         else
1482                 return -EIO;
1483
1484         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1485         if (rc)
1486                 return rc;
1487
1488         req->PersistentFileId = persistent_fid;
1489         req->VolatileFileId = volatile_fid;
1490
1491         iov[0].iov_base = (char *)req;
1492         /* 4 for rfc1002 length field */
1493         iov[0].iov_len = get_rfc1002_length(req) + 4;
1494
1495         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1496
1497         if ((rc != 0) && tcon)
1498                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1499
1500         free_rsp_buf(resp_buftype, iov[0].iov_base);
1501         return rc;
1502 }
1503
1504 /*
1505  * To form a chain of read requests, any read requests after the first should
1506  * have the end_of_chain boolean set to true.
1507  */
1508 static int
1509 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1510                   unsigned int remaining_bytes, int request_type)
1511 {
1512         int rc = -EACCES;
1513         struct smb2_read_req *req = NULL;
1514
1515         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1516         if (rc)
1517                 return rc;
1518         if (io_parms->tcon->ses->server == NULL)
1519                 return -ECONNABORTED;
1520
1521         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1522
1523         req->PersistentFileId = io_parms->persistent_fid;
1524         req->VolatileFileId = io_parms->volatile_fid;
1525         req->ReadChannelInfoOffset = 0; /* reserved */
1526         req->ReadChannelInfoLength = 0; /* reserved */
1527         req->Channel = 0; /* reserved */
1528         req->MinimumCount = 0;
1529         req->Length = cpu_to_le32(io_parms->length);
1530         req->Offset = cpu_to_le64(io_parms->offset);
1531
1532         if (request_type & CHAINED_REQUEST) {
1533                 if (!(request_type & END_OF_CHAIN)) {
1534                         /* 4 for rfc1002 length field */
1535                         req->hdr.NextCommand =
1536                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1537                 } else /* END_OF_CHAIN */
1538                         req->hdr.NextCommand = 0;
1539                 if (request_type & RELATED_REQUEST) {
1540                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1541                         /*
1542                          * Related requests use info from previous read request
1543                          * in chain.
1544                          */
1545                         req->hdr.SessionId = 0xFFFFFFFF;
1546                         req->hdr.TreeId = 0xFFFFFFFF;
1547                         req->PersistentFileId = 0xFFFFFFFF;
1548                         req->VolatileFileId = 0xFFFFFFFF;
1549                 }
1550         }
1551         if (remaining_bytes > io_parms->length)
1552                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1553         else
1554                 req->RemainingBytes = 0;
1555
1556         iov[0].iov_base = (char *)req;
1557         /* 4 for rfc1002 length field */
1558         iov[0].iov_len = get_rfc1002_length(req) + 4;
1559         return rc;
1560 }
1561
1562 static void
1563 smb2_readv_callback(struct mid_q_entry *mid)
1564 {
1565         struct cifs_readdata *rdata = mid->callback_data;
1566         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1567         struct TCP_Server_Info *server = tcon->ses->server;
1568         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1569         unsigned int credits_received = 1;
1570         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1571                                  .rq_nvec = 1,
1572                                  .rq_pages = rdata->pages,
1573                                  .rq_npages = rdata->nr_pages,
1574                                  .rq_pagesz = rdata->pagesz,
1575                                  .rq_tailsz = rdata->tailsz };
1576
1577         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1578                  __func__, mid->mid, mid->mid_state, rdata->result,
1579                  rdata->bytes);
1580
1581         switch (mid->mid_state) {
1582         case MID_RESPONSE_RECEIVED:
1583                 credits_received = le16_to_cpu(buf->CreditRequest);
1584                 /* result already set, check signature */
1585                 if (server->sign) {
1586                         int rc;
1587
1588                         rc = smb2_verify_signature(&rqst, server);
1589                         if (rc)
1590                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1591                                          rc);
1592                 }
1593                 /* FIXME: should this be counted toward the initiating task? */
1594                 task_io_account_read(rdata->bytes);
1595                 cifs_stats_bytes_read(tcon, rdata->bytes);
1596                 break;
1597         case MID_REQUEST_SUBMITTED:
1598         case MID_RETRY_NEEDED:
1599                 rdata->result = -EAGAIN;
1600                 break;
1601         default:
1602                 if (rdata->result != -ENODATA)
1603                         rdata->result = -EIO;
1604         }
1605
1606         if (rdata->result)
1607                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1608
1609         queue_work(cifsiod_wq, &rdata->work);
1610         DeleteMidQEntry(mid);
1611         add_credits(server, credits_received, 0);
1612 }
1613
1614 /* smb2_async_readv - send an async write, and set up mid to handle result */
1615 int
1616 smb2_async_readv(struct cifs_readdata *rdata)
1617 {
1618         int rc;
1619         struct smb2_hdr *buf;
1620         struct cifs_io_parms io_parms;
1621         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1622                                  .rq_nvec = 1 };
1623
1624         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1625                  __func__, rdata->offset, rdata->bytes);
1626
1627         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1628         io_parms.offset = rdata->offset;
1629         io_parms.length = rdata->bytes;
1630         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1631         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1632         io_parms.pid = rdata->pid;
1633         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1634         if (rc)
1635                 return rc;
1636
1637         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1638         /* 4 for rfc1002 length field */
1639         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1640
1641         kref_get(&rdata->refcount);
1642         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1643                              cifs_readv_receive, smb2_readv_callback,
1644                              rdata, 0);
1645         if (rc) {
1646                 kref_put(&rdata->refcount, cifs_readdata_release);
1647                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1648         }
1649
1650         cifs_small_buf_release(buf);
1651         return rc;
1652 }
1653
1654 int
1655 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1656           unsigned int *nbytes, char **buf, int *buf_type)
1657 {
1658         int resp_buftype, rc = -EACCES;
1659         struct smb2_read_rsp *rsp = NULL;
1660         struct kvec iov[1];
1661
1662         *nbytes = 0;
1663         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1664         if (rc)
1665                 return rc;
1666
1667         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1668                           &resp_buftype, CIFS_LOG_ERROR);
1669
1670         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1671
1672         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1673                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1674                 return 0;
1675         }
1676
1677         if (rc) {
1678                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1679                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1680         } else {
1681                 *nbytes = le32_to_cpu(rsp->DataLength);
1682                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1683                     (*nbytes > io_parms->length)) {
1684                         cifs_dbg(FYI, "bad length %d for count %d\n",
1685                                  *nbytes, io_parms->length);
1686                         rc = -EIO;
1687                         *nbytes = 0;
1688                 }
1689         }
1690
1691         if (*buf) {
1692                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1693                        *nbytes);
1694                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1695         } else if (resp_buftype != CIFS_NO_BUFFER) {
1696                 *buf = iov[0].iov_base;
1697                 if (resp_buftype == CIFS_SMALL_BUFFER)
1698                         *buf_type = CIFS_SMALL_BUFFER;
1699                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1700                         *buf_type = CIFS_LARGE_BUFFER;
1701         }
1702         return rc;
1703 }
1704
1705 /*
1706  * Check the mid_state and signature on received buffer (if any), and queue the
1707  * workqueue completion task.
1708  */
1709 static void
1710 smb2_writev_callback(struct mid_q_entry *mid)
1711 {
1712         struct cifs_writedata *wdata = mid->callback_data;
1713         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1714         unsigned int written;
1715         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1716         unsigned int credits_received = 1;
1717
1718         switch (mid->mid_state) {
1719         case MID_RESPONSE_RECEIVED:
1720                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1721                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1722                 if (wdata->result != 0)
1723                         break;
1724
1725                 written = le32_to_cpu(rsp->DataLength);
1726                 /*
1727                  * Mask off high 16 bits when bytes written as returned
1728                  * by the server is greater than bytes requested by the
1729                  * client. OS/2 servers are known to set incorrect
1730                  * CountHigh values.
1731                  */
1732                 if (written > wdata->bytes)
1733                         written &= 0xFFFF;
1734
1735                 if (written < wdata->bytes)
1736                         wdata->result = -ENOSPC;
1737                 else
1738                         wdata->bytes = written;
1739                 break;
1740         case MID_REQUEST_SUBMITTED:
1741         case MID_RETRY_NEEDED:
1742                 wdata->result = -EAGAIN;
1743                 break;
1744         default:
1745                 wdata->result = -EIO;
1746                 break;
1747         }
1748
1749         if (wdata->result)
1750                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1751
1752         queue_work(cifsiod_wq, &wdata->work);
1753         DeleteMidQEntry(mid);
1754         add_credits(tcon->ses->server, credits_received, 0);
1755 }
1756
1757 /* smb2_async_writev - send an async write, and set up mid to handle result */
1758 int
1759 smb2_async_writev(struct cifs_writedata *wdata)
1760 {
1761         int rc = -EACCES;
1762         struct smb2_write_req *req = NULL;
1763         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1764         struct kvec iov;
1765         struct smb_rqst rqst;
1766
1767         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1768         if (rc)
1769                 goto async_writev_out;
1770
1771         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1772
1773         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1774         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1775         req->WriteChannelInfoOffset = 0;
1776         req->WriteChannelInfoLength = 0;
1777         req->Channel = 0;
1778         req->Offset = cpu_to_le64(wdata->offset);
1779         /* 4 for rfc1002 length field */
1780         req->DataOffset = cpu_to_le16(
1781                                 offsetof(struct smb2_write_req, Buffer) - 4);
1782         req->RemainingBytes = 0;
1783
1784         /* 4 for rfc1002 length field and 1 for Buffer */
1785         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1786         iov.iov_base = req;
1787
1788         rqst.rq_iov = &iov;
1789         rqst.rq_nvec = 1;
1790         rqst.rq_pages = wdata->pages;
1791         rqst.rq_npages = wdata->nr_pages;
1792         rqst.rq_pagesz = wdata->pagesz;
1793         rqst.rq_tailsz = wdata->tailsz;
1794
1795         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1796                  wdata->offset, wdata->bytes);
1797
1798         req->Length = cpu_to_le32(wdata->bytes);
1799
1800         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1801
1802         kref_get(&wdata->refcount);
1803         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1804                                 smb2_writev_callback, wdata, 0);
1805
1806         if (rc) {
1807                 kref_put(&wdata->refcount, cifs_writedata_release);
1808                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1809         }
1810
1811 async_writev_out:
1812         cifs_small_buf_release(req);
1813         return rc;
1814 }
1815
1816 /*
1817  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1818  * The length field from io_parms must be at least 1 and indicates a number of
1819  * elements with data to write that begins with position 1 in iov array. All
1820  * data length is specified by count.
1821  */
1822 int
1823 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1824            unsigned int *nbytes, struct kvec *iov, int n_vec)
1825 {
1826         int rc = 0;
1827         struct smb2_write_req *req = NULL;
1828         struct smb2_write_rsp *rsp = NULL;
1829         int resp_buftype;
1830         *nbytes = 0;
1831
1832         if (n_vec < 1)
1833                 return rc;
1834
1835         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1836         if (rc)
1837                 return rc;
1838
1839         if (io_parms->tcon->ses->server == NULL)
1840                 return -ECONNABORTED;
1841
1842         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1843
1844         req->PersistentFileId = io_parms->persistent_fid;
1845         req->VolatileFileId = io_parms->volatile_fid;
1846         req->WriteChannelInfoOffset = 0;
1847         req->WriteChannelInfoLength = 0;
1848         req->Channel = 0;
1849         req->Length = cpu_to_le32(io_parms->length);
1850         req->Offset = cpu_to_le64(io_parms->offset);
1851         /* 4 for rfc1002 length field */
1852         req->DataOffset = cpu_to_le16(
1853                                 offsetof(struct smb2_write_req, Buffer) - 4);
1854         req->RemainingBytes = 0;
1855
1856         iov[0].iov_base = (char *)req;
1857         /* 4 for rfc1002 length field and 1 for Buffer */
1858         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1859
1860         /* length of entire message including data to be written */
1861         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1862
1863         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1864                           &resp_buftype, 0);
1865         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1866
1867         if (rc) {
1868                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1869                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1870         } else
1871                 *nbytes = le32_to_cpu(rsp->DataLength);
1872
1873         free_rsp_buf(resp_buftype, rsp);
1874         return rc;
1875 }
1876
1877 static unsigned int
1878 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1879 {
1880         int len;
1881         unsigned int entrycount = 0;
1882         unsigned int next_offset = 0;
1883         FILE_DIRECTORY_INFO *entryptr;
1884
1885         if (bufstart == NULL)
1886                 return 0;
1887
1888         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1889
1890         while (1) {
1891                 entryptr = (FILE_DIRECTORY_INFO *)
1892                                         ((char *)entryptr + next_offset);
1893
1894                 if ((char *)entryptr + size > end_of_buf) {
1895                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1896                         break;
1897                 }
1898
1899                 len = le32_to_cpu(entryptr->FileNameLength);
1900                 if ((char *)entryptr + len + size > end_of_buf) {
1901                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1902                                  end_of_buf);
1903                         break;
1904                 }
1905
1906                 *lastentry = (char *)entryptr;
1907                 entrycount++;
1908
1909                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1910                 if (!next_offset)
1911                         break;
1912         }
1913
1914         return entrycount;
1915 }
1916
1917 /*
1918  * Readdir/FindFirst
1919  */
1920 int
1921 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1922                      u64 persistent_fid, u64 volatile_fid, int index,
1923                      struct cifs_search_info *srch_inf)
1924 {
1925         struct smb2_query_directory_req *req;
1926         struct smb2_query_directory_rsp *rsp = NULL;
1927         struct kvec iov[2];
1928         int rc = 0;
1929         int len;
1930         int resp_buftype;
1931         unsigned char *bufptr;
1932         struct TCP_Server_Info *server;
1933         struct cifs_ses *ses = tcon->ses;
1934         __le16 asteriks = cpu_to_le16('*');
1935         char *end_of_smb;
1936         unsigned int output_size = CIFSMaxBufSize;
1937         size_t info_buf_size;
1938
1939         if (ses && (ses->server))
1940                 server = ses->server;
1941         else
1942                 return -EIO;
1943
1944         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1945         if (rc)
1946                 return rc;
1947
1948         switch (srch_inf->info_level) {
1949         case SMB_FIND_FILE_DIRECTORY_INFO:
1950                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1951                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1952                 break;
1953         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1954                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1955                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1956                 break;
1957         default:
1958                 cifs_dbg(VFS, "info level %u isn't supported\n",
1959                          srch_inf->info_level);
1960                 rc = -EINVAL;
1961                 goto qdir_exit;
1962         }
1963
1964         req->FileIndex = cpu_to_le32(index);
1965         req->PersistentFileId = persistent_fid;
1966         req->VolatileFileId = volatile_fid;
1967
1968         len = 0x2;
1969         bufptr = req->Buffer;
1970         memcpy(bufptr, &asteriks, len);
1971
1972         req->FileNameOffset =
1973                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1974         req->FileNameLength = cpu_to_le16(len);
1975         /*
1976          * BB could be 30 bytes or so longer if we used SMB2 specific
1977          * buffer lengths, but this is safe and close enough.
1978          */
1979         output_size = min_t(unsigned int, output_size, server->maxBuf);
1980         output_size = min_t(unsigned int, output_size, 2 << 15);
1981         req->OutputBufferLength = cpu_to_le32(output_size);
1982
1983         iov[0].iov_base = (char *)req;
1984         /* 4 for RFC1001 length and 1 for Buffer */
1985         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1986
1987         iov[1].iov_base = (char *)(req->Buffer);
1988         iov[1].iov_len = len;
1989
1990         inc_rfc1001_len(req, len - 1 /* Buffer */);
1991
1992         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1993         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1994
1995         if (rc) {
1996                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1997                 goto qdir_exit;
1998         }
1999
2000         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2001                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2002                           info_buf_size);
2003         if (rc)
2004                 goto qdir_exit;
2005
2006         srch_inf->unicode = true;
2007
2008         if (srch_inf->ntwrk_buf_start) {
2009                 if (srch_inf->smallBuf)
2010                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2011                 else
2012                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2013         }
2014         srch_inf->ntwrk_buf_start = (char *)rsp;
2015         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2016                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2017         /* 4 for rfc1002 length field */
2018         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2019         srch_inf->entries_in_buffer =
2020                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2021                                     &srch_inf->last_entry, info_buf_size);
2022         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2023         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2024                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2025                  srch_inf->srch_entries_start, srch_inf->last_entry);
2026         if (resp_buftype == CIFS_LARGE_BUFFER)
2027                 srch_inf->smallBuf = false;
2028         else if (resp_buftype == CIFS_SMALL_BUFFER)
2029                 srch_inf->smallBuf = true;
2030         else
2031                 cifs_dbg(VFS, "illegal search buffer type\n");
2032
2033         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2034                 srch_inf->endOfSearch = 1;
2035         else
2036                 srch_inf->endOfSearch = 0;
2037
2038         return rc;
2039
2040 qdir_exit:
2041         free_rsp_buf(resp_buftype, rsp);
2042         return rc;
2043 }
2044
2045 static int
2046 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2047                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2048                unsigned int num, void **data, unsigned int *size)
2049 {
2050         struct smb2_set_info_req *req;
2051         struct smb2_set_info_rsp *rsp = NULL;
2052         struct kvec *iov;
2053         int rc = 0;
2054         int resp_buftype;
2055         unsigned int i;
2056         struct TCP_Server_Info *server;
2057         struct cifs_ses *ses = tcon->ses;
2058
2059         if (ses && (ses->server))
2060                 server = ses->server;
2061         else
2062                 return -EIO;
2063
2064         if (!num)
2065                 return -EINVAL;
2066
2067         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2068         if (!iov)
2069                 return -ENOMEM;
2070
2071         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2072         if (rc) {
2073                 kfree(iov);
2074                 return rc;
2075         }
2076
2077         req->hdr.ProcessId = cpu_to_le32(pid);
2078
2079         req->InfoType = SMB2_O_INFO_FILE;
2080         req->FileInfoClass = info_class;
2081         req->PersistentFileId = persistent_fid;
2082         req->VolatileFileId = volatile_fid;
2083
2084         /* 4 for RFC1001 length and 1 for Buffer */
2085         req->BufferOffset =
2086                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2087         req->BufferLength = cpu_to_le32(*size);
2088
2089         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2090
2091         memcpy(req->Buffer, *data, *size);
2092
2093         iov[0].iov_base = (char *)req;
2094         /* 4 for RFC1001 length */
2095         iov[0].iov_len = get_rfc1002_length(req) + 4;
2096
2097         for (i = 1; i < num; i++) {
2098                 inc_rfc1001_len(req, size[i]);
2099                 le32_add_cpu(&req->BufferLength, size[i]);
2100                 iov[i].iov_base = (char *)data[i];
2101                 iov[i].iov_len = size[i];
2102         }
2103
2104         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2105         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2106
2107         if (rc != 0) {
2108                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2109                 goto out;
2110         }
2111 out:
2112         free_rsp_buf(resp_buftype, rsp);
2113         kfree(iov);
2114         return rc;
2115 }
2116
2117 int
2118 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2119             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2120 {
2121         struct smb2_file_rename_info info;
2122         void **data;
2123         unsigned int size[2];
2124         int rc;
2125         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2126
2127         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2128         if (!data)
2129                 return -ENOMEM;
2130
2131         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2132                               /* 0 = fail if target already exists */
2133         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2134         info.FileNameLength = cpu_to_le32(len);
2135
2136         data[0] = &info;
2137         size[0] = sizeof(struct smb2_file_rename_info);
2138
2139         data[1] = target_file;
2140         size[1] = len + 2 /* null */;
2141
2142         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2143                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2144                            size);
2145         kfree(data);
2146         return rc;
2147 }
2148
2149 int
2150 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2151                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2152 {
2153         struct smb2_file_link_info info;
2154         void **data;
2155         unsigned int size[2];
2156         int rc;
2157         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2158
2159         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2160         if (!data)
2161                 return -ENOMEM;
2162
2163         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2164                               /* 0 = fail if link already exists */
2165         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2166         info.FileNameLength = cpu_to_le32(len);
2167
2168         data[0] = &info;
2169         size[0] = sizeof(struct smb2_file_link_info);
2170
2171         data[1] = target_file;
2172         size[1] = len + 2 /* null */;
2173
2174         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2175                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2176         kfree(data);
2177         return rc;
2178 }
2179
2180 int
2181 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2182              u64 volatile_fid, u32 pid, __le64 *eof)
2183 {
2184         struct smb2_file_eof_info info;
2185         void *data;
2186         unsigned int size;
2187
2188         info.EndOfFile = *eof;
2189
2190         data = &info;
2191         size = sizeof(struct smb2_file_eof_info);
2192
2193         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2194                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2195 }
2196
2197 int
2198 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2199               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2200 {
2201         unsigned int size;
2202         size = sizeof(FILE_BASIC_INFO);
2203         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2204                              current->tgid, FILE_BASIC_INFORMATION, 1,
2205                              (void **)&buf, &size);
2206 }
2207
2208 int
2209 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2210                   const u64 persistent_fid, const u64 volatile_fid,
2211                   __u8 oplock_level)
2212 {
2213         int rc;
2214         struct smb2_oplock_break *req = NULL;
2215
2216         cifs_dbg(FYI, "SMB2_oplock_break\n");
2217         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2218
2219         if (rc)
2220                 return rc;
2221
2222         req->VolatileFid = volatile_fid;
2223         req->PersistentFid = persistent_fid;
2224         req->OplockLevel = oplock_level;
2225         req->hdr.CreditRequest = cpu_to_le16(1);
2226
2227         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2228         /* SMB2 buffer freed by function above */
2229
2230         if (rc) {
2231                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2232                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2233         }
2234
2235         return rc;
2236 }
2237
2238 static void
2239 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2240                         struct kstatfs *kst)
2241 {
2242         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2243                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2244         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2245         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2246         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2247         return;
2248 }
2249
2250 static int
2251 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2252                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2253 {
2254         int rc;
2255         struct smb2_query_info_req *req;
2256
2257         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2258
2259         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2260                 return -EIO;
2261
2262         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2263         if (rc)
2264                 return rc;
2265
2266         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2267         req->FileInfoClass = level;
2268         req->PersistentFileId = persistent_fid;
2269         req->VolatileFileId = volatile_fid;
2270         /* 4 for rfc1002 length field and 1 for pad */
2271         req->InputBufferOffset =
2272                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2273         req->OutputBufferLength = cpu_to_le32(
2274                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2275
2276         iov->iov_base = (char *)req;
2277         /* 4 for rfc1002 length field */
2278         iov->iov_len = get_rfc1002_length(req) + 4;
2279         return 0;
2280 }
2281
2282 int
2283 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2284               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2285 {
2286         struct smb2_query_info_rsp *rsp = NULL;
2287         struct kvec iov;
2288         int rc = 0;
2289         int resp_buftype;
2290         struct cifs_ses *ses = tcon->ses;
2291         struct smb2_fs_full_size_info *info = NULL;
2292
2293         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2294                                 sizeof(struct smb2_fs_full_size_info),
2295                                 persistent_fid, volatile_fid);
2296         if (rc)
2297                 return rc;
2298
2299         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2300         if (rc) {
2301                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2302                 goto qinf_exit;
2303         }
2304         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2305
2306         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2307                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2308         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2309                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2310                           sizeof(struct smb2_fs_full_size_info));
2311         if (!rc)
2312                 copy_fs_info_to_kstatfs(info, fsdata);
2313
2314 qinf_exit:
2315         free_rsp_buf(resp_buftype, iov.iov_base);
2316         return rc;
2317 }
2318
2319 int
2320 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2321            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2322            const __u32 num_lock, struct smb2_lock_element *buf)
2323 {
2324         int rc = 0;
2325         struct smb2_lock_req *req = NULL;
2326         struct kvec iov[2];
2327         int resp_buf_type;
2328         unsigned int count;
2329
2330         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2331
2332         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2333         if (rc)
2334                 return rc;
2335
2336         req->hdr.ProcessId = cpu_to_le32(pid);
2337         req->LockCount = cpu_to_le16(num_lock);
2338
2339         req->PersistentFileId = persist_fid;
2340         req->VolatileFileId = volatile_fid;
2341
2342         count = num_lock * sizeof(struct smb2_lock_element);
2343         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2344
2345         iov[0].iov_base = (char *)req;
2346         /* 4 for rfc1002 length field and count for all locks */
2347         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2348         iov[1].iov_base = (char *)buf;
2349         iov[1].iov_len = count;
2350
2351         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2352         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2353         if (rc) {
2354                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2355                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2356         }
2357
2358         return rc;
2359 }
2360
2361 int
2362 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2363           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2364           const __u64 length, const __u64 offset, const __u32 lock_flags,
2365           const bool wait)
2366 {
2367         struct smb2_lock_element lock;
2368
2369         lock.Offset = cpu_to_le64(offset);
2370         lock.Length = cpu_to_le64(length);
2371         lock.Flags = cpu_to_le32(lock_flags);
2372         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2373                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2374
2375         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2376 }
2377
2378 int
2379 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2380                  __u8 *lease_key, const __le32 lease_state)
2381 {
2382         int rc;
2383         struct smb2_lease_ack *req = NULL;
2384
2385         cifs_dbg(FYI, "SMB2_lease_break\n");
2386         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2387
2388         if (rc)
2389                 return rc;
2390
2391         req->hdr.CreditRequest = cpu_to_le16(1);
2392         req->StructureSize = cpu_to_le16(36);
2393         inc_rfc1001_len(req, 12);
2394
2395         memcpy(req->LeaseKey, lease_key, 16);
2396         req->LeaseState = lease_state;
2397
2398         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2399         /* SMB2 buffer freed by function above */
2400
2401         if (rc) {
2402                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2403                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2404         }
2405
2406         return rc;
2407 }