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->session_estab) {
 643                         server->sequence_number = 0x2;
 644                         server->session_estab = true;
 645                         if (server->ops->generate_signingkey)
 646                                 server->ops->generate_signingkey(server);
 647                 }
 648                 mutex_unlock(&server->srv_mutex);
 649
 650                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 651                 spin_lock(&GlobalMid_Lock);
 652                 ses->status = CifsGood;
 653                 ses->need_reconnect = false;
 654                 spin_unlock(&GlobalMid_Lock);
 655         }
 656
 657         if (!server->sign) {
 658                 kfree(ses->auth_key.response);
 659                 ses->auth_key.response = NULL;
 660         }
 661         kfree(ses->ntlmssp);
 662
 663         return rc;
 664 }
 665
 666 int
 667 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 668 {
 669         struct smb2_logoff_req *req; /* response is also trivial struct */
 670         int rc = 0;
 671         struct TCP_Server_Info *server;
 672
 673         cifs_dbg(FYI, "disconnect session %p\n", ses);
 674
 675         if (ses && (ses->server))
 676                 server = ses->server;
 677         else
 678                 return -EIO;
 679
 680         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 681         if (rc)
 682                 return rc;
 683
 684          /* since no tcon, smb2_init can not do this, so do here */
 685         req->hdr.SessionId = ses->Suid;
 686         if (server->sign)
 687                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 688
 689         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 690         /*
 691          * No tcon so can't do
 692          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 693          */
 694         return rc;
 695 }
 696
 697 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 698 {
 699         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 700 }
 701
 702 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 703
 704 int
 705 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 706           struct cifs_tcon *tcon, const struct nls_table *cp)
 707 {
 708         struct smb2_tree_connect_req *req;
 709         struct smb2_tree_connect_rsp *rsp = NULL;
 710         struct kvec iov[2];
 711         int rc = 0;
 712         int resp_buftype;
 713         int unc_path_len;
 714         struct TCP_Server_Info *server;
 715         __le16 *unc_path = NULL;
 716
 717         cifs_dbg(FYI, "TCON\n");
 718
 719         if ((ses->server) && tree)
 720                 server = ses->server;
 721         else
 722                 return -EIO;
 723
 724         if (tcon && tcon->bad_network_name)
 725                 return -ENOENT;
 726
 727         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 728         if (unc_path == NULL)
 729                 return -ENOMEM;
 730
 731         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 732         unc_path_len *= 2;
 733         if (unc_path_len < 2) {
 734                 kfree(unc_path);
 735                 return -EINVAL;
 736         }
 737
 738         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 739         if (rc) {
 740                 kfree(unc_path);
 741                 return rc;
 742         }
 743
 744         if (tcon == NULL) {
 745                 /* since no tcon, smb2_init can not do this, so do here */
 746                 req->hdr.SessionId = ses->Suid;
 747                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 748                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 749         }
 750
 751         iov[0].iov_base = (char *)req;
 752         /* 4 for rfc1002 length field and 1 for pad */
 753         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 754
 755         /* Testing shows that buffer offset must be at location of Buffer[0] */
 756         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 757                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 758         req->PathLength = cpu_to_le16(unc_path_len - 2);
 759         iov[1].iov_base = unc_path;
 760         iov[1].iov_len = unc_path_len;
 761
 762         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 763
 764         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 765         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 766
 767         if (rc != 0) {
 768                 if (tcon) {
 769                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 770                         tcon->need_reconnect = true;
 771                 }
 772                 goto tcon_error_exit;
 773         }
 774
 775         if (tcon == NULL) {
 776                 ses->ipc_tid = rsp->hdr.TreeId;
 777                 goto tcon_exit;
 778         }
 779
 780         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 781                 cifs_dbg(FYI, "connection to disk share\n");
 782         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 783                 tcon->ipc = true;
 784                 cifs_dbg(FYI, "connection to pipe share\n");
 785         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 786                 tcon->print = true;
 787                 cifs_dbg(FYI, "connection to printer\n");
 788         } else {
 789                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 790                 rc = -EOPNOTSUPP;
 791                 goto tcon_error_exit;
 792         }
 793
 794         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 795         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 796         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 797         tcon->tidStatus = CifsGood;
 798         tcon->need_reconnect = false;
 799         tcon->tid = rsp->hdr.TreeId;
 800         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 801
 802         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 803             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 804                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 805
 806 tcon_exit:
 807         free_rsp_buf(resp_buftype, rsp);
 808         kfree(unc_path);
 809         return rc;
 810
 811 tcon_error_exit:
 812         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 813                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 814                 tcon->bad_network_name = true;
 815         }
 816         goto tcon_exit;
 817 }
 818
 819 int
 820 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 821 {
 822         struct smb2_tree_disconnect_req *req; /* response is trivial */
 823         int rc = 0;
 824         struct TCP_Server_Info *server;
 825         struct cifs_ses *ses = tcon->ses;
 826
 827         cifs_dbg(FYI, "Tree Disconnect\n");
 828
 829         if (ses && (ses->server))
 830                 server = ses->server;
 831         else
 832                 return -EIO;
 833
 834         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 835                 return 0;
 836
 837         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 838         if (rc)
 839                 return rc;
 840
 841         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 842         if (rc)
 843                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 844
 845         return rc;
 846 }
 847
 848 static struct create_lease *
 849 create_lease_buf(u8 *lease_key, u8 oplock)
 850 {
 851         struct create_lease *buf;
 852
 853         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 854         if (!buf)
 855                 return NULL;
 856
 857         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 858         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 859         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 860                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 861                                            SMB2_LEASE_READ_CACHING;
 862         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 863                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 864         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 865                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 866                                            SMB2_LEASE_READ_CACHING |
 867                                            SMB2_LEASE_WRITE_CACHING;
 868
 869         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 870                                         (struct create_lease, lcontext));
 871         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 872         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 873                                 (struct create_lease, Name));
 874         buf->ccontext.NameLength = cpu_to_le16(4);
 875         buf->Name[0] = 'R';
 876         buf->Name[1] = 'q';
 877         buf->Name[2] = 'L';
 878         buf->Name[3] = 's';
 879         return buf;
 880 }
 881
 882 static struct create_durable *
 883 create_durable_buf(void)
 884 {
 885         struct create_durable *buf;
 886
 887         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 888         if (!buf)
 889                 return NULL;
 890
 891         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 892                                         (struct create_durable, Data));
 893         buf->ccontext.DataLength = cpu_to_le32(16);
 894         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 895                                 (struct create_durable, Name));
 896         buf->ccontext.NameLength = cpu_to_le16(4);
 897         buf->Name[0] = 'D';
 898         buf->Name[1] = 'H';
 899         buf->Name[2] = 'n';
 900         buf->Name[3] = 'Q';
 901         return buf;
 902 }
 903
 904 static struct create_durable *
 905 create_reconnect_durable_buf(struct cifs_fid *fid)
 906 {
 907         struct create_durable *buf;
 908
 909         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 910         if (!buf)
 911                 return NULL;
 912
 913         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 914                                         (struct create_durable, Data));
 915         buf->ccontext.DataLength = cpu_to_le32(16);
 916         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 917                                 (struct create_durable, Name));
 918         buf->ccontext.NameLength = cpu_to_le16(4);
 919         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 920         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 921         buf->Name[0] = 'D';
 922         buf->Name[1] = 'H';
 923         buf->Name[2] = 'n';
 924         buf->Name[3] = 'C';
 925         return buf;
 926 }
 927
 928 static __u8
 929 parse_lease_state(struct smb2_create_rsp *rsp)
 930 {
 931         char *data_offset;
 932         struct create_lease *lc;
 933         bool found = false;
 934         unsigned int next = 0;
 935         char *name;
 936
 937         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 938         lc = (struct create_lease *)data_offset;
 939         do {
 940                 lc = (struct create_lease *)((char *)lc + next);
 941                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 942                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 943                     strncmp(name, "RqLs", 4)) {
 944                         next = le32_to_cpu(lc->ccontext.Next);
 945                         continue;
 946                 }
 947                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 948                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 949                 found = true;
 950                 break;
 951         } while (next != 0);
 952
 953         if (!found)
 954                 return 0;
 955
 956         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 957 }
 958
 959 static int
 960 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
 961 {
 962         struct smb2_create_req *req = iov[0].iov_base;
 963         unsigned int num = *num_iovec;
 964
 965         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
 966         if (iov[num].iov_base == NULL)
 967                 return -ENOMEM;
 968         iov[num].iov_len = sizeof(struct create_lease);
 969         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 970         if (!req->CreateContextsOffset)
 971                 req->CreateContextsOffset = cpu_to_le32(
 972                                 sizeof(struct smb2_create_req) - 4 +
 973                                 iov[num - 1].iov_len);
 974         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_lease));
 975         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 976         *num_iovec = num + 1;
 977         return 0;
 978 }
 979
 980 static int
 981 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 982                     struct cifs_open_parms *oparms)
 983 {
 984         struct smb2_create_req *req = iov[0].iov_base;
 985         unsigned int num = *num_iovec;
 986
 987         if (oparms->reconnect) {
 988                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 989                 /* indicate that we don't need to relock the file */
 990                 oparms->reconnect = false;
 991         } else
 992                 iov[num].iov_base = create_durable_buf();
 993         if (iov[num].iov_base == NULL)
 994                 return -ENOMEM;
 995         iov[num].iov_len = sizeof(struct create_durable);
 996         if (!req->CreateContextsOffset)
 997                 req->CreateContextsOffset =
 998                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 999                                                                 iov[1].iov_len);
1000         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1001         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1002         *num_iovec = num + 1;
1003         return 0;
1004 }
1005
1006 int
1007 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1008           __u8 *oplock, struct smb2_file_all_info *buf,
1009           struct smb2_err_rsp **err_buf)
1010 {
1011         struct smb2_create_req *req;
1012         struct smb2_create_rsp *rsp;
1013         struct TCP_Server_Info *server;
1014         struct cifs_tcon *tcon = oparms->tcon;
1015         struct cifs_ses *ses = tcon->ses;
1016         struct kvec iov[4];
1017         int resp_buftype;
1018         int uni_path_len;
1019         __le16 *copy_path = NULL;
1020         int copy_size;
1021         int rc = 0;
1022         unsigned int num_iovecs = 2;
1023         __u32 file_attributes = 0;
1024
1025         cifs_dbg(FYI, "create/open\n");
1026
1027         if (ses && (ses->server))
1028                 server = ses->server;
1029         else
1030                 return -EIO;
1031
1032         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1033         if (rc)
1034                 return rc;
1035
1036         if (oparms->create_options & CREATE_OPTION_READONLY)
1037                 file_attributes |= ATTR_READONLY;
1038
1039         req->ImpersonationLevel = IL_IMPERSONATION;
1040         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1041         /* File attributes ignored on open (used in create though) */
1042         req->FileAttributes = cpu_to_le32(file_attributes);
1043         req->ShareAccess = FILE_SHARE_ALL_LE;
1044         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1045         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1046         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1047         /* do not count rfc1001 len field */
1048         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1049
1050         iov[0].iov_base = (char *)req;
1051         /* 4 for rfc1002 length field */
1052         iov[0].iov_len = get_rfc1002_length(req) + 4;
1053
1054         /* MUST set path len (NameLength) to 0 opening root of share */
1055         req->NameLength = cpu_to_le16(uni_path_len - 2);
1056         /* -1 since last byte is buf[0] which is sent below (path) */
1057         iov[0].iov_len--;
1058         if (uni_path_len % 8 != 0) {
1059                 copy_size = uni_path_len / 8 * 8;
1060                 if (copy_size < uni_path_len)
1061                         copy_size += 8;
1062
1063                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1064                 if (!copy_path)
1065                         return -ENOMEM;
1066                 memcpy((char *)copy_path, (const char *)path,
1067                         uni_path_len);
1068                 uni_path_len = copy_size;
1069                 path = copy_path;
1070         }
1071
1072         iov[1].iov_len = uni_path_len;
1073         iov[1].iov_base = path;
1074         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1075         inc_rfc1001_len(req, uni_path_len - 1);
1076
1077         if (!server->oplocks)
1078                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1079
1080         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1081             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1082                 req->RequestedOplockLevel = *oplock;
1083         else {
1084                 rc = add_lease_context(iov, &num_iovecs, oplock);
1085                 if (rc) {
1086                         cifs_small_buf_release(req);
1087                         kfree(copy_path);
1088                         return rc;
1089                 }
1090         }
1091
1092         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1093                 /* need to set Next field of lease context if we request it */
1094                 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1095                         struct create_context *ccontext =
1096                             (struct create_context *)iov[num_iovecs-1].iov_base;
1097                         ccontext->Next =
1098                                 cpu_to_le32(sizeof(struct create_lease));
1099                 }
1100                 rc = add_durable_context(iov, &num_iovecs, oparms);
1101                 if (rc) {
1102                         cifs_small_buf_release(req);
1103                         kfree(copy_path);
1104                         kfree(iov[num_iovecs-1].iov_base);
1105                         return rc;
1106                 }
1107         }
1108
1109         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1110         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1111
1112         if (rc != 0) {
1113                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1114                 if (err_buf)
1115                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1116                                            GFP_KERNEL);
1117                 goto creat_exit;
1118         }
1119
1120         oparms->fid->persistent_fid = rsp->PersistentFileId;
1121         oparms->fid->volatile_fid = rsp->VolatileFileId;
1122
1123         if (buf) {
1124                 memcpy(buf, &rsp->CreationTime, 32);
1125                 buf->AllocationSize = rsp->AllocationSize;
1126                 buf->EndOfFile = rsp->EndofFile;
1127                 buf->Attributes = rsp->FileAttributes;
1128                 buf->NumberOfLinks = cpu_to_le32(1);
1129                 buf->DeletePending = 0;
1130         }
1131
1132         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1133                 *oplock = parse_lease_state(rsp);
1134         else
1135                 *oplock = rsp->OplockLevel;
1136 creat_exit:
1137         kfree(copy_path);
1138         free_rsp_buf(resp_buftype, rsp);
1139         return rc;
1140 }
1141
1142 /*
1143  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1144  */
1145 int
1146 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1147            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1148            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1149 {
1150         struct smb2_ioctl_req *req;
1151         struct smb2_ioctl_rsp *rsp;
1152         struct TCP_Server_Info *server;
1153         struct cifs_ses *ses = tcon->ses;
1154         struct kvec iov[2];
1155         int resp_buftype;
1156         int num_iovecs;
1157         int rc = 0;
1158
1159         cifs_dbg(FYI, "SMB2 IOCTL\n");
1160
1161         /* zero out returned data len, in case of error */
1162         if (plen)
1163                 *plen = 0;
1164
1165         if (ses && (ses->server))
1166                 server = ses->server;
1167         else
1168                 return -EIO;
1169
1170         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1171         if (rc)
1172                 return rc;
1173
1174         req->CtlCode = cpu_to_le32(opcode);
1175         req->PersistentFileId = persistent_fid;
1176         req->VolatileFileId = volatile_fid;
1177
1178         if (indatalen) {
1179                 req->InputCount = cpu_to_le32(indatalen);
1180                 /* do not set InputOffset if no input data */
1181                 req->InputOffset =
1182                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1183                 iov[1].iov_base = in_data;
1184                 iov[1].iov_len = indatalen;
1185                 num_iovecs = 2;
1186         } else
1187                 num_iovecs = 1;
1188
1189         req->OutputOffset = 0;
1190         req->OutputCount = 0; /* MBZ */
1191
1192         /*
1193          * Could increase MaxOutputResponse, but that would require more
1194          * than one credit. Windows typically sets this smaller, but for some
1195          * ioctls it may be useful to allow server to send more. No point
1196          * limiting what the server can send as long as fits in one credit
1197          */
1198         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1199
1200         if (is_fsctl)
1201                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1202         else
1203                 req->Flags = 0;
1204
1205         iov[0].iov_base = (char *)req;
1206         /* 4 for rfc1002 length field */
1207         iov[0].iov_len = get_rfc1002_length(req) + 4;
1208
1209         if (indatalen)
1210                 inc_rfc1001_len(req, indatalen);
1211
1212         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1213         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1214
1215         if (rc != 0) {
1216                 if (tcon)
1217                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1218                 goto ioctl_exit;
1219         }
1220
1221         /* check if caller wants to look at return data or just return rc */
1222         if ((plen == NULL) || (out_data == NULL))
1223                 goto ioctl_exit;
1224
1225         *plen = le32_to_cpu(rsp->OutputCount);
1226
1227         /* We check for obvious errors in the output buffer length and offset */
1228         if (*plen == 0)
1229                 goto ioctl_exit; /* server returned no data */
1230         else if (*plen > 0xFF00) {
1231                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1232                 *plen = 0;
1233                 rc = -EIO;
1234                 goto ioctl_exit;
1235         }
1236
1237         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1238                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1239                         le32_to_cpu(rsp->OutputOffset));
1240                 *plen = 0;
1241                 rc = -EIO;
1242                 goto ioctl_exit;
1243         }
1244
1245         *out_data = kmalloc(*plen, GFP_KERNEL);
1246         if (*out_data == NULL) {
1247                 rc = -ENOMEM;
1248                 goto ioctl_exit;
1249         }
1250
1251         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1252                *plen);
1253 ioctl_exit:
1254         free_rsp_buf(resp_buftype, rsp);
1255         return rc;
1256 }
1257
1258 int
1259 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1260            u64 persistent_fid, u64 volatile_fid)
1261 {
1262         struct smb2_close_req *req;
1263         struct smb2_close_rsp *rsp;
1264         struct TCP_Server_Info *server;
1265         struct cifs_ses *ses = tcon->ses;
1266         struct kvec iov[1];
1267         int resp_buftype;
1268         int rc = 0;
1269
1270         cifs_dbg(FYI, "Close\n");
1271
1272         if (ses && (ses->server))
1273                 server = ses->server;
1274         else
1275                 return -EIO;
1276
1277         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1278         if (rc)
1279                 return rc;
1280
1281         req->PersistentFileId = persistent_fid;
1282         req->VolatileFileId = volatile_fid;
1283
1284         iov[0].iov_base = (char *)req;
1285         /* 4 for rfc1002 length field */
1286         iov[0].iov_len = get_rfc1002_length(req) + 4;
1287
1288         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1289         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1290
1291         if (rc != 0) {
1292                 if (tcon)
1293                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1294                 goto close_exit;
1295         }
1296
1297         /* BB FIXME - decode close response, update inode for caching */
1298
1299 close_exit:
1300         free_rsp_buf(resp_buftype, rsp);
1301         return rc;
1302 }
1303
1304 static int
1305 validate_buf(unsigned int offset, unsigned int buffer_length,
1306              struct smb2_hdr *hdr, unsigned int min_buf_size)
1307
1308 {
1309         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1310         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1311         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1312         char *end_of_buf = begin_of_buf + buffer_length;
1313
1314
1315         if (buffer_length < min_buf_size) {
1316                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1317                          buffer_length, min_buf_size);
1318                 return -EINVAL;
1319         }
1320
1321         /* check if beyond RFC1001 maximum length */
1322         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1323                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1324                          buffer_length, smb_len);
1325                 return -EINVAL;
1326         }
1327
1328         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1329                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1330                 return -EINVAL;
1331         }
1332
1333         return 0;
1334 }
1335
1336 /*
1337  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1338  * Caller must free buffer.
1339  */
1340 static int
1341 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1342                       struct smb2_hdr *hdr, unsigned int minbufsize,
1343                       char *data)
1344
1345 {
1346         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1347         int rc;
1348
1349         if (!data)
1350                 return -EINVAL;
1351
1352         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1353         if (rc)
1354                 return rc;
1355
1356         memcpy(data, begin_of_buf, buffer_length);
1357
1358         return 0;
1359 }
1360
1361 static int
1362 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1363            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1364            size_t output_len, size_t min_len, void *data)
1365 {
1366         struct smb2_query_info_req *req;
1367         struct smb2_query_info_rsp *rsp = NULL;
1368         struct kvec iov[2];
1369         int rc = 0;
1370         int resp_buftype;
1371         struct TCP_Server_Info *server;
1372         struct cifs_ses *ses = tcon->ses;
1373
1374         cifs_dbg(FYI, "Query Info\n");
1375
1376         if (ses && (ses->server))
1377                 server = ses->server;
1378         else
1379                 return -EIO;
1380
1381         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1382         if (rc)
1383                 return rc;
1384
1385         req->InfoType = SMB2_O_INFO_FILE;
1386         req->FileInfoClass = info_class;
1387         req->PersistentFileId = persistent_fid;
1388         req->VolatileFileId = volatile_fid;
1389         /* 4 for rfc1002 length field and 1 for Buffer */
1390         req->InputBufferOffset =
1391                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1392         req->OutputBufferLength = cpu_to_le32(output_len);
1393
1394         iov[0].iov_base = (char *)req;
1395         /* 4 for rfc1002 length field */
1396         iov[0].iov_len = get_rfc1002_length(req) + 4;
1397
1398         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1399         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1400
1401         if (rc) {
1402                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1403                 goto qinf_exit;
1404         }
1405
1406         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1407                                    le32_to_cpu(rsp->OutputBufferLength),
1408                                    &rsp->hdr, min_len, data);
1409
1410 qinf_exit:
1411         free_rsp_buf(resp_buftype, rsp);
1412         return rc;
1413 }
1414
1415 int
1416 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1417                 u64 persistent_fid, u64 volatile_fid,
1418                 struct smb2_file_all_info *data)
1419 {
1420         return query_info(xid, tcon, persistent_fid, volatile_fid,
1421                           FILE_ALL_INFORMATION,
1422                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1423                           sizeof(struct smb2_file_all_info), data);
1424 }
1425
1426 int
1427 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1428                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1429 {
1430         return query_info(xid, tcon, persistent_fid, volatile_fid,
1431                           FILE_INTERNAL_INFORMATION,
1432                           sizeof(struct smb2_file_internal_info),
1433                           sizeof(struct smb2_file_internal_info), uniqueid);
1434 }
1435
1436 /*
1437  * This is a no-op for now. We're not really interested in the reply, but
1438  * rather in the fact that the server sent one and that server->lstrp
1439  * gets updated.
1440  *
1441  * FIXME: maybe we should consider checking that the reply matches request?
1442  */
1443 static void
1444 smb2_echo_callback(struct mid_q_entry *mid)
1445 {
1446         struct TCP_Server_Info *server = mid->callback_data;
1447         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1448         unsigned int credits_received = 1;
1449
1450         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1451                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1452
1453         DeleteMidQEntry(mid);
1454         add_credits(server, credits_received, CIFS_ECHO_OP);
1455 }
1456
1457 int
1458 SMB2_echo(struct TCP_Server_Info *server)
1459 {
1460         struct smb2_echo_req *req;
1461         int rc = 0;
1462         struct kvec iov;
1463         struct smb_rqst rqst = { .rq_iov = &iov,
1464                                  .rq_nvec = 1 };
1465
1466         cifs_dbg(FYI, "In echo request\n");
1467
1468         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1469         if (rc)
1470                 return rc;
1471
1472         req->hdr.CreditRequest = cpu_to_le16(1);
1473
1474         iov.iov_base = (char *)req;
1475         /* 4 for rfc1002 length field */
1476         iov.iov_len = get_rfc1002_length(req) + 4;
1477
1478         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1479                              CIFS_ECHO_OP);
1480         if (rc)
1481                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1482
1483         cifs_small_buf_release(req);
1484         return rc;
1485 }
1486
1487 int
1488 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1489            u64 volatile_fid)
1490 {
1491         struct smb2_flush_req *req;
1492         struct TCP_Server_Info *server;
1493         struct cifs_ses *ses = tcon->ses;
1494         struct kvec iov[1];
1495         int resp_buftype;
1496         int rc = 0;
1497
1498         cifs_dbg(FYI, "Flush\n");
1499
1500         if (ses && (ses->server))
1501                 server = ses->server;
1502         else
1503                 return -EIO;
1504
1505         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1506         if (rc)
1507                 return rc;
1508
1509         req->PersistentFileId = persistent_fid;
1510         req->VolatileFileId = volatile_fid;
1511
1512         iov[0].iov_base = (char *)req;
1513         /* 4 for rfc1002 length field */
1514         iov[0].iov_len = get_rfc1002_length(req) + 4;
1515
1516         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1517
1518         if ((rc != 0) && tcon)
1519                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1520
1521         free_rsp_buf(resp_buftype, iov[0].iov_base);
1522         return rc;
1523 }
1524
1525 /*
1526  * To form a chain of read requests, any read requests after the first should
1527  * have the end_of_chain boolean set to true.
1528  */
1529 static int
1530 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1531                   unsigned int remaining_bytes, int request_type)
1532 {
1533         int rc = -EACCES;
1534         struct smb2_read_req *req = NULL;
1535
1536         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1537         if (rc)
1538                 return rc;
1539         if (io_parms->tcon->ses->server == NULL)
1540                 return -ECONNABORTED;
1541
1542         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1543
1544         req->PersistentFileId = io_parms->persistent_fid;
1545         req->VolatileFileId = io_parms->volatile_fid;
1546         req->ReadChannelInfoOffset = 0; /* reserved */
1547         req->ReadChannelInfoLength = 0; /* reserved */
1548         req->Channel = 0; /* reserved */
1549         req->MinimumCount = 0;
1550         req->Length = cpu_to_le32(io_parms->length);
1551         req->Offset = cpu_to_le64(io_parms->offset);
1552
1553         if (request_type & CHAINED_REQUEST) {
1554                 if (!(request_type & END_OF_CHAIN)) {
1555                         /* 4 for rfc1002 length field */
1556                         req->hdr.NextCommand =
1557                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1558                 } else /* END_OF_CHAIN */
1559                         req->hdr.NextCommand = 0;
1560                 if (request_type & RELATED_REQUEST) {
1561                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1562                         /*
1563                          * Related requests use info from previous read request
1564                          * in chain.
1565                          */
1566                         req->hdr.SessionId = 0xFFFFFFFF;
1567                         req->hdr.TreeId = 0xFFFFFFFF;
1568                         req->PersistentFileId = 0xFFFFFFFF;
1569                         req->VolatileFileId = 0xFFFFFFFF;
1570                 }
1571         }
1572         if (remaining_bytes > io_parms->length)
1573                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1574         else
1575                 req->RemainingBytes = 0;
1576
1577         iov[0].iov_base = (char *)req;
1578         /* 4 for rfc1002 length field */
1579         iov[0].iov_len = get_rfc1002_length(req) + 4;
1580         return rc;
1581 }
1582
1583 static void
1584 smb2_readv_callback(struct mid_q_entry *mid)
1585 {
1586         struct cifs_readdata *rdata = mid->callback_data;
1587         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1588         struct TCP_Server_Info *server = tcon->ses->server;
1589         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1590         unsigned int credits_received = 1;
1591         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1592                                  .rq_nvec = 1,
1593                                  .rq_pages = rdata->pages,
1594                                  .rq_npages = rdata->nr_pages,
1595                                  .rq_pagesz = rdata->pagesz,
1596                                  .rq_tailsz = rdata->tailsz };
1597
1598         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1599                  __func__, mid->mid, mid->mid_state, rdata->result,
1600                  rdata->bytes);
1601
1602         switch (mid->mid_state) {
1603         case MID_RESPONSE_RECEIVED:
1604                 credits_received = le16_to_cpu(buf->CreditRequest);
1605                 /* result already set, check signature */
1606                 if (server->sign) {
1607                         int rc;
1608
1609                         rc = smb2_verify_signature(&rqst, server);
1610                         if (rc)
1611                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1612                                          rc);
1613                 }
1614                 /* FIXME: should this be counted toward the initiating task? */
1615                 task_io_account_read(rdata->bytes);
1616                 cifs_stats_bytes_read(tcon, rdata->bytes);
1617                 break;
1618         case MID_REQUEST_SUBMITTED:
1619         case MID_RETRY_NEEDED:
1620                 rdata->result = -EAGAIN;
1621                 break;
1622         default:
1623                 if (rdata->result != -ENODATA)
1624                         rdata->result = -EIO;
1625         }
1626
1627         if (rdata->result)
1628                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1629
1630         queue_work(cifsiod_wq, &rdata->work);
1631         DeleteMidQEntry(mid);
1632         add_credits(server, credits_received, 0);
1633 }
1634
1635 /* smb2_async_readv - send an async write, and set up mid to handle result */
1636 int
1637 smb2_async_readv(struct cifs_readdata *rdata)
1638 {
1639         int rc;
1640         struct smb2_hdr *buf;
1641         struct cifs_io_parms io_parms;
1642         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1643                                  .rq_nvec = 1 };
1644
1645         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1646                  __func__, rdata->offset, rdata->bytes);
1647
1648         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1649         io_parms.offset = rdata->offset;
1650         io_parms.length = rdata->bytes;
1651         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1652         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1653         io_parms.pid = rdata->pid;
1654         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1655         if (rc)
1656                 return rc;
1657
1658         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1659         /* 4 for rfc1002 length field */
1660         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1661
1662         kref_get(&rdata->refcount);
1663         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1664                              cifs_readv_receive, smb2_readv_callback,
1665                              rdata, 0);
1666         if (rc) {
1667                 kref_put(&rdata->refcount, cifs_readdata_release);
1668                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1669         }
1670
1671         cifs_small_buf_release(buf);
1672         return rc;
1673 }
1674
1675 int
1676 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1677           unsigned int *nbytes, char **buf, int *buf_type)
1678 {
1679         int resp_buftype, rc = -EACCES;
1680         struct smb2_read_rsp *rsp = NULL;
1681         struct kvec iov[1];
1682
1683         *nbytes = 0;
1684         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1685         if (rc)
1686                 return rc;
1687
1688         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1689                           &resp_buftype, CIFS_LOG_ERROR);
1690
1691         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1692
1693         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1694                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1695                 return 0;
1696         }
1697
1698         if (rc) {
1699                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1700                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1701         } else {
1702                 *nbytes = le32_to_cpu(rsp->DataLength);
1703                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1704                     (*nbytes > io_parms->length)) {
1705                         cifs_dbg(FYI, "bad length %d for count %d\n",
1706                                  *nbytes, io_parms->length);
1707                         rc = -EIO;
1708                         *nbytes = 0;
1709                 }
1710         }
1711
1712         if (*buf) {
1713                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1714                        *nbytes);
1715                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1716         } else if (resp_buftype != CIFS_NO_BUFFER) {
1717                 *buf = iov[0].iov_base;
1718                 if (resp_buftype == CIFS_SMALL_BUFFER)
1719                         *buf_type = CIFS_SMALL_BUFFER;
1720                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1721                         *buf_type = CIFS_LARGE_BUFFER;
1722         }
1723         return rc;
1724 }
1725
1726 /*
1727  * Check the mid_state and signature on received buffer (if any), and queue the
1728  * workqueue completion task.
1729  */
1730 static void
1731 smb2_writev_callback(struct mid_q_entry *mid)
1732 {
1733         struct cifs_writedata *wdata = mid->callback_data;
1734         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1735         unsigned int written;
1736         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1737         unsigned int credits_received = 1;
1738
1739         switch (mid->mid_state) {
1740         case MID_RESPONSE_RECEIVED:
1741                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1742                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1743                 if (wdata->result != 0)
1744                         break;
1745
1746                 written = le32_to_cpu(rsp->DataLength);
1747                 /*
1748                  * Mask off high 16 bits when bytes written as returned
1749                  * by the server is greater than bytes requested by the
1750                  * client. OS/2 servers are known to set incorrect
1751                  * CountHigh values.
1752                  */
1753                 if (written > wdata->bytes)
1754                         written &= 0xFFFF;
1755
1756                 if (written < wdata->bytes)
1757                         wdata->result = -ENOSPC;
1758                 else
1759                         wdata->bytes = written;
1760                 break;
1761         case MID_REQUEST_SUBMITTED:
1762         case MID_RETRY_NEEDED:
1763                 wdata->result = -EAGAIN;
1764                 break;
1765         default:
1766                 wdata->result = -EIO;
1767                 break;
1768         }
1769
1770         if (wdata->result)
1771                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1772
1773         queue_work(cifsiod_wq, &wdata->work);
1774         DeleteMidQEntry(mid);
1775         add_credits(tcon->ses->server, credits_received, 0);
1776 }
1777
1778 /* smb2_async_writev - send an async write, and set up mid to handle result */
1779 int
1780 smb2_async_writev(struct cifs_writedata *wdata)
1781 {
1782         int rc = -EACCES;
1783         struct smb2_write_req *req = NULL;
1784         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1785         struct kvec iov;
1786         struct smb_rqst rqst;
1787
1788         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1789         if (rc)
1790                 goto async_writev_out;
1791
1792         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1793
1794         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1795         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1796         req->WriteChannelInfoOffset = 0;
1797         req->WriteChannelInfoLength = 0;
1798         req->Channel = 0;
1799         req->Offset = cpu_to_le64(wdata->offset);
1800         /* 4 for rfc1002 length field */
1801         req->DataOffset = cpu_to_le16(
1802                                 offsetof(struct smb2_write_req, Buffer) - 4);
1803         req->RemainingBytes = 0;
1804
1805         /* 4 for rfc1002 length field and 1 for Buffer */
1806         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1807         iov.iov_base = req;
1808
1809         rqst.rq_iov = &iov;
1810         rqst.rq_nvec = 1;
1811         rqst.rq_pages = wdata->pages;
1812         rqst.rq_npages = wdata->nr_pages;
1813         rqst.rq_pagesz = wdata->pagesz;
1814         rqst.rq_tailsz = wdata->tailsz;
1815
1816         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1817                  wdata->offset, wdata->bytes);
1818
1819         req->Length = cpu_to_le32(wdata->bytes);
1820
1821         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1822
1823         kref_get(&wdata->refcount);
1824         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1825                                 smb2_writev_callback, wdata, 0);
1826
1827         if (rc) {
1828                 kref_put(&wdata->refcount, cifs_writedata_release);
1829                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1830         }
1831
1832 async_writev_out:
1833         cifs_small_buf_release(req);
1834         return rc;
1835 }
1836
1837 /*
1838  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1839  * The length field from io_parms must be at least 1 and indicates a number of
1840  * elements with data to write that begins with position 1 in iov array. All
1841  * data length is specified by count.
1842  */
1843 int
1844 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1845            unsigned int *nbytes, struct kvec *iov, int n_vec)
1846 {
1847         int rc = 0;
1848         struct smb2_write_req *req = NULL;
1849         struct smb2_write_rsp *rsp = NULL;
1850         int resp_buftype;
1851         *nbytes = 0;
1852
1853         if (n_vec < 1)
1854                 return rc;
1855
1856         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1857         if (rc)
1858                 return rc;
1859
1860         if (io_parms->tcon->ses->server == NULL)
1861                 return -ECONNABORTED;
1862
1863         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1864
1865         req->PersistentFileId = io_parms->persistent_fid;
1866         req->VolatileFileId = io_parms->volatile_fid;
1867         req->WriteChannelInfoOffset = 0;
1868         req->WriteChannelInfoLength = 0;
1869         req->Channel = 0;
1870         req->Length = cpu_to_le32(io_parms->length);
1871         req->Offset = cpu_to_le64(io_parms->offset);
1872         /* 4 for rfc1002 length field */
1873         req->DataOffset = cpu_to_le16(
1874                                 offsetof(struct smb2_write_req, Buffer) - 4);
1875         req->RemainingBytes = 0;
1876
1877         iov[0].iov_base = (char *)req;
1878         /* 4 for rfc1002 length field and 1 for Buffer */
1879         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1880
1881         /* length of entire message including data to be written */
1882         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1883
1884         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1885                           &resp_buftype, 0);
1886         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1887
1888         if (rc) {
1889                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1890                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1891         } else
1892                 *nbytes = le32_to_cpu(rsp->DataLength);
1893
1894         free_rsp_buf(resp_buftype, rsp);
1895         return rc;
1896 }
1897
1898 static unsigned int
1899 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1900 {
1901         int len;
1902         unsigned int entrycount = 0;
1903         unsigned int next_offset = 0;
1904         FILE_DIRECTORY_INFO *entryptr;
1905
1906         if (bufstart == NULL)
1907                 return 0;
1908
1909         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1910
1911         while (1) {
1912                 entryptr = (FILE_DIRECTORY_INFO *)
1913                                         ((char *)entryptr + next_offset);
1914
1915                 if ((char *)entryptr + size > end_of_buf) {
1916                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1917                         break;
1918                 }
1919
1920                 len = le32_to_cpu(entryptr->FileNameLength);
1921                 if ((char *)entryptr + len + size > end_of_buf) {
1922                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1923                                  end_of_buf);
1924                         break;
1925                 }
1926
1927                 *lastentry = (char *)entryptr;
1928                 entrycount++;
1929
1930                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1931                 if (!next_offset)
1932                         break;
1933         }
1934
1935         return entrycount;
1936 }
1937
1938 /*
1939  * Readdir/FindFirst
1940  */
1941 int
1942 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1943                      u64 persistent_fid, u64 volatile_fid, int index,
1944                      struct cifs_search_info *srch_inf)
1945 {
1946         struct smb2_query_directory_req *req;
1947         struct smb2_query_directory_rsp *rsp = NULL;
1948         struct kvec iov[2];
1949         int rc = 0;
1950         int len;
1951         int resp_buftype;
1952         unsigned char *bufptr;
1953         struct TCP_Server_Info *server;
1954         struct cifs_ses *ses = tcon->ses;
1955         __le16 asteriks = cpu_to_le16('*');
1956         char *end_of_smb;
1957         unsigned int output_size = CIFSMaxBufSize;
1958         size_t info_buf_size;
1959
1960         if (ses && (ses->server))
1961                 server = ses->server;
1962         else
1963                 return -EIO;
1964
1965         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1966         if (rc)
1967                 return rc;
1968
1969         switch (srch_inf->info_level) {
1970         case SMB_FIND_FILE_DIRECTORY_INFO:
1971                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1972                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1973                 break;
1974         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1975                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1976                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1977                 break;
1978         default:
1979                 cifs_dbg(VFS, "info level %u isn't supported\n",
1980                          srch_inf->info_level);
1981                 rc = -EINVAL;
1982                 goto qdir_exit;
1983         }
1984
1985         req->FileIndex = cpu_to_le32(index);
1986         req->PersistentFileId = persistent_fid;
1987         req->VolatileFileId = volatile_fid;
1988
1989         len = 0x2;
1990         bufptr = req->Buffer;
1991         memcpy(bufptr, &asteriks, len);
1992
1993         req->FileNameOffset =
1994                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1995         req->FileNameLength = cpu_to_le16(len);
1996         /*
1997          * BB could be 30 bytes or so longer if we used SMB2 specific
1998          * buffer lengths, but this is safe and close enough.
1999          */
2000         output_size = min_t(unsigned int, output_size, server->maxBuf);
2001         output_size = min_t(unsigned int, output_size, 2 << 15);
2002         req->OutputBufferLength = cpu_to_le32(output_size);
2003
2004         iov[0].iov_base = (char *)req;
2005         /* 4 for RFC1001 length and 1 for Buffer */
2006         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2007
2008         iov[1].iov_base = (char *)(req->Buffer);
2009         iov[1].iov_len = len;
2010
2011         inc_rfc1001_len(req, len - 1 /* Buffer */);
2012
2013         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2014         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2015
2016         if (rc) {
2017                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2018                 goto qdir_exit;
2019         }
2020
2021         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2022                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2023                           info_buf_size);
2024         if (rc)
2025                 goto qdir_exit;
2026
2027         srch_inf->unicode = true;
2028
2029         if (srch_inf->ntwrk_buf_start) {
2030                 if (srch_inf->smallBuf)
2031                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2032                 else
2033                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2034         }
2035         srch_inf->ntwrk_buf_start = (char *)rsp;
2036         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2037                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2038         /* 4 for rfc1002 length field */
2039         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2040         srch_inf->entries_in_buffer =
2041                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2042                                     &srch_inf->last_entry, info_buf_size);
2043         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2044         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2045                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2046                  srch_inf->srch_entries_start, srch_inf->last_entry);
2047         if (resp_buftype == CIFS_LARGE_BUFFER)
2048                 srch_inf->smallBuf = false;
2049         else if (resp_buftype == CIFS_SMALL_BUFFER)
2050                 srch_inf->smallBuf = true;
2051         else
2052                 cifs_dbg(VFS, "illegal search buffer type\n");
2053
2054         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2055                 srch_inf->endOfSearch = 1;
2056         else
2057                 srch_inf->endOfSearch = 0;
2058
2059         return rc;
2060
2061 qdir_exit:
2062         free_rsp_buf(resp_buftype, rsp);
2063         return rc;
2064 }
2065
2066 static int
2067 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2068                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2069                unsigned int num, void **data, unsigned int *size)
2070 {
2071         struct smb2_set_info_req *req;
2072         struct smb2_set_info_rsp *rsp = NULL;
2073         struct kvec *iov;
2074         int rc = 0;
2075         int resp_buftype;
2076         unsigned int i;
2077         struct TCP_Server_Info *server;
2078         struct cifs_ses *ses = tcon->ses;
2079
2080         if (ses && (ses->server))
2081                 server = ses->server;
2082         else
2083                 return -EIO;
2084
2085         if (!num)
2086                 return -EINVAL;
2087
2088         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2089         if (!iov)
2090                 return -ENOMEM;
2091
2092         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2093         if (rc) {
2094                 kfree(iov);
2095                 return rc;
2096         }
2097
2098         req->hdr.ProcessId = cpu_to_le32(pid);
2099
2100         req->InfoType = SMB2_O_INFO_FILE;
2101         req->FileInfoClass = info_class;
2102         req->PersistentFileId = persistent_fid;
2103         req->VolatileFileId = volatile_fid;
2104
2105         /* 4 for RFC1001 length and 1 for Buffer */
2106         req->BufferOffset =
2107                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2108         req->BufferLength = cpu_to_le32(*size);
2109
2110         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2111
2112         memcpy(req->Buffer, *data, *size);
2113
2114         iov[0].iov_base = (char *)req;
2115         /* 4 for RFC1001 length */
2116         iov[0].iov_len = get_rfc1002_length(req) + 4;
2117
2118         for (i = 1; i < num; i++) {
2119                 inc_rfc1001_len(req, size[i]);
2120                 le32_add_cpu(&req->BufferLength, size[i]);
2121                 iov[i].iov_base = (char *)data[i];
2122                 iov[i].iov_len = size[i];
2123         }
2124
2125         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2126         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2127
2128         if (rc != 0) {
2129                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2130                 goto out;
2131         }
2132 out:
2133         free_rsp_buf(resp_buftype, rsp);
2134         kfree(iov);
2135         return rc;
2136 }
2137
2138 int
2139 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2140             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2141 {
2142         struct smb2_file_rename_info info;
2143         void **data;
2144         unsigned int size[2];
2145         int rc;
2146         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2147
2148         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2149         if (!data)
2150                 return -ENOMEM;
2151
2152         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2153                               /* 0 = fail if target already exists */
2154         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2155         info.FileNameLength = cpu_to_le32(len);
2156
2157         data[0] = &info;
2158         size[0] = sizeof(struct smb2_file_rename_info);
2159
2160         data[1] = target_file;
2161         size[1] = len + 2 /* null */;
2162
2163         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2164                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2165                            size);
2166         kfree(data);
2167         return rc;
2168 }
2169
2170 int
2171 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2172                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2173 {
2174         struct smb2_file_link_info info;
2175         void **data;
2176         unsigned int size[2];
2177         int rc;
2178         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2179
2180         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2181         if (!data)
2182                 return -ENOMEM;
2183
2184         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2185                               /* 0 = fail if link already exists */
2186         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2187         info.FileNameLength = cpu_to_le32(len);
2188
2189         data[0] = &info;
2190         size[0] = sizeof(struct smb2_file_link_info);
2191
2192         data[1] = target_file;
2193         size[1] = len + 2 /* null */;
2194
2195         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2196                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2197         kfree(data);
2198         return rc;
2199 }
2200
2201 int
2202 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2203              u64 volatile_fid, u32 pid, __le64 *eof)
2204 {
2205         struct smb2_file_eof_info info;
2206         void *data;
2207         unsigned int size;
2208
2209         info.EndOfFile = *eof;
2210
2211         data = &info;
2212         size = sizeof(struct smb2_file_eof_info);
2213
2214         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2215                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2216 }
2217
2218 int
2219 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2220               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2221 {
2222         unsigned int size;
2223         size = sizeof(FILE_BASIC_INFO);
2224         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2225                              current->tgid, FILE_BASIC_INFORMATION, 1,
2226                              (void **)&buf, &size);
2227 }
2228
2229 int
2230 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2231                   const u64 persistent_fid, const u64 volatile_fid,
2232                   __u8 oplock_level)
2233 {
2234         int rc;
2235         struct smb2_oplock_break *req = NULL;
2236
2237         cifs_dbg(FYI, "SMB2_oplock_break\n");
2238         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2239
2240         if (rc)
2241                 return rc;
2242
2243         req->VolatileFid = volatile_fid;
2244         req->PersistentFid = persistent_fid;
2245         req->OplockLevel = oplock_level;
2246         req->hdr.CreditRequest = cpu_to_le16(1);
2247
2248         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2249         /* SMB2 buffer freed by function above */
2250
2251         if (rc) {
2252                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2253                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2254         }
2255
2256         return rc;
2257 }
2258
2259 static void
2260 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2261                         struct kstatfs *kst)
2262 {
2263         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2264                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2265         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2266         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2267         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2268         return;
2269 }
2270
2271 static int
2272 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2273                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2274 {
2275         int rc;
2276         struct smb2_query_info_req *req;
2277
2278         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2279
2280         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2281                 return -EIO;
2282
2283         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2284         if (rc)
2285                 return rc;
2286
2287         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2288         req->FileInfoClass = level;
2289         req->PersistentFileId = persistent_fid;
2290         req->VolatileFileId = volatile_fid;
2291         /* 4 for rfc1002 length field and 1 for pad */
2292         req->InputBufferOffset =
2293                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2294         req->OutputBufferLength = cpu_to_le32(
2295                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2296
2297         iov->iov_base = (char *)req;
2298         /* 4 for rfc1002 length field */
2299         iov->iov_len = get_rfc1002_length(req) + 4;
2300         return 0;
2301 }
2302
2303 int
2304 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2305               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2306 {
2307         struct smb2_query_info_rsp *rsp = NULL;
2308         struct kvec iov;
2309         int rc = 0;
2310         int resp_buftype;
2311         struct cifs_ses *ses = tcon->ses;
2312         struct smb2_fs_full_size_info *info = NULL;
2313
2314         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2315                                 sizeof(struct smb2_fs_full_size_info),
2316                                 persistent_fid, volatile_fid);
2317         if (rc)
2318                 return rc;
2319
2320         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2321         if (rc) {
2322                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2323                 goto qinf_exit;
2324         }
2325         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2326
2327         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2328                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2329         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2330                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2331                           sizeof(struct smb2_fs_full_size_info));
2332         if (!rc)
2333                 copy_fs_info_to_kstatfs(info, fsdata);
2334
2335 qinf_exit:
2336         free_rsp_buf(resp_buftype, iov.iov_base);
2337         return rc;
2338 }
2339
2340 int
2341 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2342            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2343            const __u32 num_lock, struct smb2_lock_element *buf)
2344 {
2345         int rc = 0;
2346         struct smb2_lock_req *req = NULL;
2347         struct kvec iov[2];
2348         int resp_buf_type;
2349         unsigned int count;
2350
2351         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2352
2353         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2354         if (rc)
2355                 return rc;
2356
2357         req->hdr.ProcessId = cpu_to_le32(pid);
2358         req->LockCount = cpu_to_le16(num_lock);
2359
2360         req->PersistentFileId = persist_fid;
2361         req->VolatileFileId = volatile_fid;
2362
2363         count = num_lock * sizeof(struct smb2_lock_element);
2364         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2365
2366         iov[0].iov_base = (char *)req;
2367         /* 4 for rfc1002 length field and count for all locks */
2368         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2369         iov[1].iov_base = (char *)buf;
2370         iov[1].iov_len = count;
2371
2372         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2373         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2374         if (rc) {
2375                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2376                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2377         }
2378
2379         return rc;
2380 }
2381
2382 int
2383 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2384           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2385           const __u64 length, const __u64 offset, const __u32 lock_flags,
2386           const bool wait)
2387 {
2388         struct smb2_lock_element lock;
2389
2390         lock.Offset = cpu_to_le64(offset);
2391         lock.Length = cpu_to_le64(length);
2392         lock.Flags = cpu_to_le32(lock_flags);
2393         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2394                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2395
2396         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2397 }
2398
2399 int
2400 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2401                  __u8 *lease_key, const __le32 lease_state)
2402 {
2403         int rc;
2404         struct smb2_lease_ack *req = NULL;
2405
2406         cifs_dbg(FYI, "SMB2_lease_break\n");
2407         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2408
2409         if (rc)
2410                 return rc;
2411
2412         req->hdr.CreditRequest = cpu_to_le16(1);
2413         req->StructureSize = cpu_to_le16(36);
2414         inc_rfc1001_len(req, 12);
2415
2416         memcpy(req->LeaseKey, lease_key, 16);
2417         req->LeaseState = lease_state;
2418
2419         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2420         /* SMB2 buffer freed by function above */
2421
2422         if (rc) {
2423                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2424                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2425         }
2426
2427         return rc;
2428 }