fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server = ses->server;
 468         u16 blob_length = 0;
 469         char *security_blob;
 470         char *ntlmssp_blob = NULL;
 471         bool use_spnego = false; /* else use raw ntlmssp */
 472
 473         cifs_dbg(FYI, "Session Setup\n");
 474
 475         if (!server) {
 476                 WARN(1, "%s: server is NULL!\n", __func__);
 477                 return -EIO;
 478         }
 479
 480         /*
 481          * If we are here due to reconnect, free per-smb session key
 482          * in case signing was required.
 483          */
 484         kfree(ses->auth_key.response);
 485         ses->auth_key.response = NULL;
 486
 487         /*
 488          * If memory allocation is successful, caller of this function
 489          * frees it.
 490          */
 491         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 492         if (!ses->ntlmssp)
 493                 return -ENOMEM;
 494         ses->ntlmssp->sesskey_per_smbsess = true;
 495
 496         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 497         ses->sectype = RawNTLMSSP;
 498
 499 ssetup_ntlmssp_authenticate:
 500         if (phase == NtLmChallenge)
 501                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 502
 503         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 504         if (rc)
 505                 return rc;
 506
 507         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 508         req->VcNumber = 0; /* MBZ */
 509         /* to enable echos and oplocks */
 510         req->hdr.CreditRequest = cpu_to_le16(3);
 511
 512         /* only one of SMB2 signing flags may be set in SMB2 request */
 513         if (server->sign)
 514                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 515         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 516                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 517         else
 518                 req->SecurityMode = 0;
 519
 520         req->Capabilities = 0;
 521         req->Channel = 0; /* MBZ */
 522
 523         iov[0].iov_base = (char *)req;
 524         /* 4 for rfc1002 length field and 1 for pad */
 525         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 526         if (phase == NtLmNegotiate) {
 527                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 528                                        GFP_KERNEL);
 529                 if (ntlmssp_blob == NULL) {
 530                         rc = -ENOMEM;
 531                         goto ssetup_exit;
 532                 }
 533                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 534                 if (use_spnego) {
 535                         /* blob_length = build_spnego_ntlmssp_blob(
 536                                         &security_blob,
 537                                         sizeof(struct _NEGOTIATE_MESSAGE),
 538                                         ntlmssp_blob); */
 539                         /* BB eventually need to add this */
 540                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 541                         rc = -EOPNOTSUPP;
 542                         kfree(ntlmssp_blob);
 543                         goto ssetup_exit;
 544                 } else {
 545                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 546                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 547                         security_blob = ntlmssp_blob;
 548                 }
 549         } else if (phase == NtLmAuthenticate) {
 550                 req->hdr.SessionId = ses->Suid;
 551                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 552                                        GFP_KERNEL);
 553                 if (ntlmssp_blob == NULL) {
 554                         rc = -ENOMEM;
 555                         goto ssetup_exit;
 556                 }
 557                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 558                                              nls_cp);
 559                 if (rc) {
 560                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 561                                  rc);
 562                         goto ssetup_exit; /* BB double check error handling */
 563                 }
 564                 if (use_spnego) {
 565                         /* blob_length = build_spnego_ntlmssp_blob(
 566                                                         &security_blob,
 567                                                         blob_length,
 568                                                         ntlmssp_blob); */
 569                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 570                         rc = -EOPNOTSUPP;
 571                         kfree(ntlmssp_blob);
 572                         goto ssetup_exit;
 573                 } else {
 574                         security_blob = ntlmssp_blob;
 575                 }
 576         } else {
 577                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 578                 rc = -EIO;
 579                 goto ssetup_exit;
 580         }
 581
 582         /* Testing shows that buffer offset must be at location of Buffer[0] */
 583         req->SecurityBufferOffset =
 584                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 585                                             1 /* pad */ - 4 /* rfc1001 len */);
 586         req->SecurityBufferLength = cpu_to_le16(blob_length);
 587         iov[1].iov_base = security_blob;
 588         iov[1].iov_len = blob_length;
 589
 590         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 591
 592         /* BB add code to build os and lm fields */
 593
 594         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 595                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 596
 597         kfree(security_blob);
 598         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 599         if (resp_buftype != CIFS_NO_BUFFER &&
 600             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 601                 if (phase != NtLmNegotiate) {
 602                         cifs_dbg(VFS, "Unexpected more processing error\n");
 603                         goto ssetup_exit;
 604                 }
 605                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 606                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 607                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 608                                  le16_to_cpu(rsp->SecurityBufferOffset));
 609                         rc = -EIO;
 610                         goto ssetup_exit;
 611                 }
 612
 613                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 614                 phase = NtLmChallenge; /* process ntlmssp challenge */
 615                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 616                 ses->Suid = rsp->hdr.SessionId;
 617                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 618                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 619         }
 620
 621         /*
 622          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 623          * but at least the raw NTLMSSP case works.
 624          */
 625         /*
 626          * No tcon so can't do
 627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 628          */
 629         if (rc != 0)
 630                 goto ssetup_exit;
 631
 632         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 633 ssetup_exit:
 634         free_rsp_buf(resp_buftype, rsp);
 635
 636         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 637         if ((phase == NtLmChallenge) && (rc == 0))
 638                 goto ssetup_ntlmssp_authenticate;
 639
 640         if (!rc) {
 641                 mutex_lock(&server->srv_mutex);
 642                 if (server->sign && server->ops->generate_signingkey) {
 643                         rc = server->ops->generate_signingkey(ses);
 644                         kfree(ses->auth_key.response);
 645                         ses->auth_key.response = NULL;
 646                         if (rc) {
 647                                 cifs_dbg(FYI,
 648                                         "SMB3 session key generation failed\n");
 649                                 mutex_unlock(&server->srv_mutex);
 650                                 goto keygen_exit;
 651                         }
 652                 }
 653                 if (!server->session_estab) {
 654                         server->sequence_number = 0x2;
 655                         server->session_estab = true;
 656                 }
 657                 mutex_unlock(&server->srv_mutex);
 658
 659                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 660                 spin_lock(&GlobalMid_Lock);
 661                 ses->status = CifsGood;
 662                 ses->need_reconnect = false;
 663                 spin_unlock(&GlobalMid_Lock);
 664         }
 665
 666 keygen_exit:
 667         if (!server->sign) {
 668                 kfree(ses->auth_key.response);
 669                 ses->auth_key.response = NULL;
 670         }
 671         kfree(ses->ntlmssp);
 672
 673         return rc;
 674 }
 675
 676 int
 677 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 678 {
 679         struct smb2_logoff_req *req; /* response is also trivial struct */
 680         int rc = 0;
 681         struct TCP_Server_Info *server;
 682
 683         cifs_dbg(FYI, "disconnect session %p\n", ses);
 684
 685         if (ses && (ses->server))
 686                 server = ses->server;
 687         else
 688                 return -EIO;
 689
 690         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 691         if (rc)
 692                 return rc;
 693
 694          /* since no tcon, smb2_init can not do this, so do here */
 695         req->hdr.SessionId = ses->Suid;
 696         if (server->sign)
 697                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 698
 699         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 700         /*
 701          * No tcon so can't do
 702          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 703          */
 704         return rc;
 705 }
 706
 707 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 708 {
 709         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 710 }
 711
 712 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 713
 714 int
 715 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 716           struct cifs_tcon *tcon, const struct nls_table *cp)
 717 {
 718         struct smb2_tree_connect_req *req;
 719         struct smb2_tree_connect_rsp *rsp = NULL;
 720         struct kvec iov[2];
 721         int rc = 0;
 722         int resp_buftype;
 723         int unc_path_len;
 724         struct TCP_Server_Info *server;
 725         __le16 *unc_path = NULL;
 726
 727         cifs_dbg(FYI, "TCON\n");
 728
 729         if ((ses->server) && tree)
 730                 server = ses->server;
 731         else
 732                 return -EIO;
 733
 734         if (tcon && tcon->bad_network_name)
 735                 return -ENOENT;
 736
 737         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 738         if (unc_path == NULL)
 739                 return -ENOMEM;
 740
 741         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 742         unc_path_len *= 2;
 743         if (unc_path_len < 2) {
 744                 kfree(unc_path);
 745                 return -EINVAL;
 746         }
 747
 748         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 749         if (rc) {
 750                 kfree(unc_path);
 751                 return rc;
 752         }
 753
 754         if (tcon == NULL) {
 755                 /* since no tcon, smb2_init can not do this, so do here */
 756                 req->hdr.SessionId = ses->Suid;
 757                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 758                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 759         }
 760
 761         iov[0].iov_base = (char *)req;
 762         /* 4 for rfc1002 length field and 1 for pad */
 763         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 764
 765         /* Testing shows that buffer offset must be at location of Buffer[0] */
 766         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 767                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 768         req->PathLength = cpu_to_le16(unc_path_len - 2);
 769         iov[1].iov_base = unc_path;
 770         iov[1].iov_len = unc_path_len;
 771
 772         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 773
 774         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 775         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 776
 777         if (rc != 0) {
 778                 if (tcon) {
 779                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 780                         tcon->need_reconnect = true;
 781                 }
 782                 goto tcon_error_exit;
 783         }
 784
 785         if (tcon == NULL) {
 786                 ses->ipc_tid = rsp->hdr.TreeId;
 787                 goto tcon_exit;
 788         }
 789
 790         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 791                 cifs_dbg(FYI, "connection to disk share\n");
 792         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 793                 tcon->ipc = true;
 794                 cifs_dbg(FYI, "connection to pipe share\n");
 795         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 796                 tcon->print = true;
 797                 cifs_dbg(FYI, "connection to printer\n");
 798         } else {
 799                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 800                 rc = -EOPNOTSUPP;
 801                 goto tcon_error_exit;
 802         }
 803
 804         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 805         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 806         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 807         tcon->tidStatus = CifsGood;
 808         tcon->need_reconnect = false;
 809         tcon->tid = rsp->hdr.TreeId;
 810         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 811
 812         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 813             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 814                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 815
 816 tcon_exit:
 817         free_rsp_buf(resp_buftype, rsp);
 818         kfree(unc_path);
 819         return rc;
 820
 821 tcon_error_exit:
 822         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 823                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 824                 tcon->bad_network_name = true;
 825         }
 826         goto tcon_exit;
 827 }
 828
 829 int
 830 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 831 {
 832         struct smb2_tree_disconnect_req *req; /* response is trivial */
 833         int rc = 0;
 834         struct TCP_Server_Info *server;
 835         struct cifs_ses *ses = tcon->ses;
 836
 837         cifs_dbg(FYI, "Tree Disconnect\n");
 838
 839         if (ses && (ses->server))
 840                 server = ses->server;
 841         else
 842                 return -EIO;
 843
 844         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 845                 return 0;
 846
 847         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 848         if (rc)
 849                 return rc;
 850
 851         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 852         if (rc)
 853                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 854
 855         return rc;
 856 }
 857
 858 static struct create_lease *
 859 create_lease_buf(u8 *lease_key, u8 oplock)
 860 {
 861         struct create_lease *buf;
 862
 863         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 864         if (!buf)
 865                 return NULL;
 866
 867         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 868         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 869         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 870                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 871                                            SMB2_LEASE_READ_CACHING;
 872         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 873                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 874         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 875                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 876                                            SMB2_LEASE_READ_CACHING |
 877                                            SMB2_LEASE_WRITE_CACHING;
 878
 879         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 880                                         (struct create_lease, lcontext));
 881         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 882         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 883                                 (struct create_lease, Name));
 884         buf->ccontext.NameLength = cpu_to_le16(4);
 885         buf->Name[0] = 'R';
 886         buf->Name[1] = 'q';
 887         buf->Name[2] = 'L';
 888         buf->Name[3] = 's';
 889         return buf;
 890 }
 891
 892 static struct create_durable *
 893 create_durable_buf(void)
 894 {
 895         struct create_durable *buf;
 896
 897         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 898         if (!buf)
 899                 return NULL;
 900
 901         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 902                                         (struct create_durable, Data));
 903         buf->ccontext.DataLength = cpu_to_le32(16);
 904         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 905                                 (struct create_durable, Name));
 906         buf->ccontext.NameLength = cpu_to_le16(4);
 907         buf->Name[0] = 'D';
 908         buf->Name[1] = 'H';
 909         buf->Name[2] = 'n';
 910         buf->Name[3] = 'Q';
 911         return buf;
 912 }
 913
 914 static struct create_durable *
 915 create_reconnect_durable_buf(struct cifs_fid *fid)
 916 {
 917         struct create_durable *buf;
 918
 919         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 920         if (!buf)
 921                 return NULL;
 922
 923         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 924                                         (struct create_durable, Data));
 925         buf->ccontext.DataLength = cpu_to_le32(16);
 926         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 927                                 (struct create_durable, Name));
 928         buf->ccontext.NameLength = cpu_to_le16(4);
 929         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 930         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 931         buf->Name[0] = 'D';
 932         buf->Name[1] = 'H';
 933         buf->Name[2] = 'n';
 934         buf->Name[3] = 'C';
 935         return buf;
 936 }
 937
 938 static __u8
 939 parse_lease_state(struct smb2_create_rsp *rsp)
 940 {
 941         char *data_offset;
 942         struct create_lease *lc;
 943         bool found = false;
 944         unsigned int next = 0;
 945         char *name;
 946
 947         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 948         lc = (struct create_lease *)data_offset;
 949         do {
 950                 lc = (struct create_lease *)((char *)lc + next);
 951                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 952                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 953                     strncmp(name, "RqLs", 4)) {
 954                         next = le32_to_cpu(lc->ccontext.Next);
 955                         continue;
 956                 }
 957                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 958                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 959                 found = true;
 960                 break;
 961         } while (next != 0);
 962
 963         if (!found)
 964                 return 0;
 965
 966         return le32_to_cpu(lc->lcontext.LeaseState);
 967 }
 968
 969 static int
 970 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
 971 {
 972         struct smb2_create_req *req = iov[0].iov_base;
 973         unsigned int num = *num_iovec;
 974
 975         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
 976         if (iov[num].iov_base == NULL)
 977                 return -ENOMEM;
 978         iov[num].iov_len = sizeof(struct create_lease);
 979         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 980         if (!req->CreateContextsOffset)
 981                 req->CreateContextsOffset = cpu_to_le32(
 982                                 sizeof(struct smb2_create_req) - 4 +
 983                                 iov[num - 1].iov_len);
 984         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_lease));
 985         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 986         *num_iovec = num + 1;
 987         return 0;
 988 }
 989
 990 static int
 991 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 992                     struct cifs_open_parms *oparms)
 993 {
 994         struct smb2_create_req *req = iov[0].iov_base;
 995         unsigned int num = *num_iovec;
 996
 997         if (oparms->reconnect) {
 998                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 999                 /* indicate that we don't need to relock the file */
1000                 oparms->reconnect = false;
1001         } else
1002                 iov[num].iov_base = create_durable_buf();
1003         if (iov[num].iov_base == NULL)
1004                 return -ENOMEM;
1005         iov[num].iov_len = sizeof(struct create_durable);
1006         if (!req->CreateContextsOffset)
1007                 req->CreateContextsOffset =
1008                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1009                                                                 iov[1].iov_len);
1010         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1011         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1012         *num_iovec = num + 1;
1013         return 0;
1014 }
1015
1016 int
1017 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1018           __u8 *oplock, struct smb2_file_all_info *buf,
1019           struct smb2_err_rsp **err_buf)
1020 {
1021         struct smb2_create_req *req;
1022         struct smb2_create_rsp *rsp;
1023         struct TCP_Server_Info *server;
1024         struct cifs_tcon *tcon = oparms->tcon;
1025         struct cifs_ses *ses = tcon->ses;
1026         struct kvec iov[4];
1027         int resp_buftype;
1028         int uni_path_len;
1029         __le16 *copy_path = NULL;
1030         int copy_size;
1031         int rc = 0;
1032         unsigned int num_iovecs = 2;
1033         __u32 file_attributes = 0;
1034
1035         cifs_dbg(FYI, "create/open\n");
1036
1037         if (ses && (ses->server))
1038                 server = ses->server;
1039         else
1040                 return -EIO;
1041
1042         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1043         if (rc)
1044                 return rc;
1045
1046         if (oparms->create_options & CREATE_OPTION_READONLY)
1047                 file_attributes |= ATTR_READONLY;
1048
1049         req->ImpersonationLevel = IL_IMPERSONATION;
1050         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1051         /* File attributes ignored on open (used in create though) */
1052         req->FileAttributes = cpu_to_le32(file_attributes);
1053         req->ShareAccess = FILE_SHARE_ALL_LE;
1054         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1055         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1056         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1057         /* do not count rfc1001 len field */
1058         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1059
1060         iov[0].iov_base = (char *)req;
1061         /* 4 for rfc1002 length field */
1062         iov[0].iov_len = get_rfc1002_length(req) + 4;
1063
1064         /* MUST set path len (NameLength) to 0 opening root of share */
1065         req->NameLength = cpu_to_le16(uni_path_len - 2);
1066         /* -1 since last byte is buf[0] which is sent below (path) */
1067         iov[0].iov_len--;
1068         if (uni_path_len % 8 != 0) {
1069                 copy_size = uni_path_len / 8 * 8;
1070                 if (copy_size < uni_path_len)
1071                         copy_size += 8;
1072
1073                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1074                 if (!copy_path)
1075                         return -ENOMEM;
1076                 memcpy((char *)copy_path, (const char *)path,
1077                         uni_path_len);
1078                 uni_path_len = copy_size;
1079                 path = copy_path;
1080         }
1081
1082         iov[1].iov_len = uni_path_len;
1083         iov[1].iov_base = path;
1084         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1085         inc_rfc1001_len(req, uni_path_len - 1);
1086
1087         if (!server->oplocks)
1088                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1089
1090         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1091             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1092                 req->RequestedOplockLevel = *oplock;
1093         else {
1094                 rc = add_lease_context(iov, &num_iovecs, oplock);
1095                 if (rc) {
1096                         cifs_small_buf_release(req);
1097                         kfree(copy_path);
1098                         return rc;
1099                 }
1100         }
1101
1102         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1103                 /* need to set Next field of lease context if we request it */
1104                 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1105                         struct create_context *ccontext =
1106                             (struct create_context *)iov[num_iovecs-1].iov_base;
1107                         ccontext->Next =
1108                                 cpu_to_le32(sizeof(struct create_lease));
1109                 }
1110                 rc = add_durable_context(iov, &num_iovecs, oparms);
1111                 if (rc) {
1112                         cifs_small_buf_release(req);
1113                         kfree(copy_path);
1114                         kfree(iov[num_iovecs-1].iov_base);
1115                         return rc;
1116                 }
1117         }
1118
1119         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1120         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1121
1122         if (rc != 0) {
1123                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1124                 if (err_buf)
1125                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1126                                            GFP_KERNEL);
1127                 goto creat_exit;
1128         }
1129
1130         oparms->fid->persistent_fid = rsp->PersistentFileId;
1131         oparms->fid->volatile_fid = rsp->VolatileFileId;
1132
1133         if (buf) {
1134                 memcpy(buf, &rsp->CreationTime, 32);
1135                 buf->AllocationSize = rsp->AllocationSize;
1136                 buf->EndOfFile = rsp->EndofFile;
1137                 buf->Attributes = rsp->FileAttributes;
1138                 buf->NumberOfLinks = cpu_to_le32(1);
1139                 buf->DeletePending = 0;
1140         }
1141
1142         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1143                 *oplock = parse_lease_state(rsp);
1144         else
1145                 *oplock = rsp->OplockLevel;
1146 creat_exit:
1147         kfree(copy_path);
1148         free_rsp_buf(resp_buftype, rsp);
1149         return rc;
1150 }
1151
1152 /*
1153  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1154  */
1155 int
1156 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1157            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1158            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1159 {
1160         struct smb2_ioctl_req *req;
1161         struct smb2_ioctl_rsp *rsp;
1162         struct TCP_Server_Info *server;
1163         struct cifs_ses *ses = tcon->ses;
1164         struct kvec iov[2];
1165         int resp_buftype;
1166         int num_iovecs;
1167         int rc = 0;
1168
1169         cifs_dbg(FYI, "SMB2 IOCTL\n");
1170
1171         /* zero out returned data len, in case of error */
1172         if (plen)
1173                 *plen = 0;
1174
1175         if (ses && (ses->server))
1176                 server = ses->server;
1177         else
1178                 return -EIO;
1179
1180         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1181         if (rc)
1182                 return rc;
1183
1184         req->CtlCode = cpu_to_le32(opcode);
1185         req->PersistentFileId = persistent_fid;
1186         req->VolatileFileId = volatile_fid;
1187
1188         if (indatalen) {
1189                 req->InputCount = cpu_to_le32(indatalen);
1190                 /* do not set InputOffset if no input data */
1191                 req->InputOffset =
1192                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1193                 iov[1].iov_base = in_data;
1194                 iov[1].iov_len = indatalen;
1195                 num_iovecs = 2;
1196         } else
1197                 num_iovecs = 1;
1198
1199         req->OutputOffset = 0;
1200         req->OutputCount = 0; /* MBZ */
1201
1202         /*
1203          * Could increase MaxOutputResponse, but that would require more
1204          * than one credit. Windows typically sets this smaller, but for some
1205          * ioctls it may be useful to allow server to send more. No point
1206          * limiting what the server can send as long as fits in one credit
1207          */
1208         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1209
1210         if (is_fsctl)
1211                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1212         else
1213                 req->Flags = 0;
1214
1215         iov[0].iov_base = (char *)req;
1216         /* 4 for rfc1002 length field */
1217         iov[0].iov_len = get_rfc1002_length(req) + 4;
1218
1219         if (indatalen)
1220                 inc_rfc1001_len(req, indatalen);
1221
1222         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1223         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1224
1225         if (rc != 0) {
1226                 if (tcon)
1227                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1228                 goto ioctl_exit;
1229         }
1230
1231         /* check if caller wants to look at return data or just return rc */
1232         if ((plen == NULL) || (out_data == NULL))
1233                 goto ioctl_exit;
1234
1235         *plen = le32_to_cpu(rsp->OutputCount);
1236
1237         /* We check for obvious errors in the output buffer length and offset */
1238         if (*plen == 0)
1239                 goto ioctl_exit; /* server returned no data */
1240         else if (*plen > 0xFF00) {
1241                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1242                 *plen = 0;
1243                 rc = -EIO;
1244                 goto ioctl_exit;
1245         }
1246
1247         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1248                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1249                         le32_to_cpu(rsp->OutputOffset));
1250                 *plen = 0;
1251                 rc = -EIO;
1252                 goto ioctl_exit;
1253         }
1254
1255         *out_data = kmalloc(*plen, GFP_KERNEL);
1256         if (*out_data == NULL) {
1257                 rc = -ENOMEM;
1258                 goto ioctl_exit;
1259         }
1260
1261         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1262                *plen);
1263 ioctl_exit:
1264         free_rsp_buf(resp_buftype, rsp);
1265         return rc;
1266 }
1267
1268 int
1269 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1270            u64 persistent_fid, u64 volatile_fid)
1271 {
1272         struct smb2_close_req *req;
1273         struct smb2_close_rsp *rsp;
1274         struct TCP_Server_Info *server;
1275         struct cifs_ses *ses = tcon->ses;
1276         struct kvec iov[1];
1277         int resp_buftype;
1278         int rc = 0;
1279
1280         cifs_dbg(FYI, "Close\n");
1281
1282         if (ses && (ses->server))
1283                 server = ses->server;
1284         else
1285                 return -EIO;
1286
1287         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1288         if (rc)
1289                 return rc;
1290
1291         req->PersistentFileId = persistent_fid;
1292         req->VolatileFileId = volatile_fid;
1293
1294         iov[0].iov_base = (char *)req;
1295         /* 4 for rfc1002 length field */
1296         iov[0].iov_len = get_rfc1002_length(req) + 4;
1297
1298         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1299         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1300
1301         if (rc != 0) {
1302                 if (tcon)
1303                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1304                 goto close_exit;
1305         }
1306
1307         /* BB FIXME - decode close response, update inode for caching */
1308
1309 close_exit:
1310         free_rsp_buf(resp_buftype, rsp);
1311         return rc;
1312 }
1313
1314 static int
1315 validate_buf(unsigned int offset, unsigned int buffer_length,
1316              struct smb2_hdr *hdr, unsigned int min_buf_size)
1317
1318 {
1319         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1320         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1321         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1322         char *end_of_buf = begin_of_buf + buffer_length;
1323
1324
1325         if (buffer_length < min_buf_size) {
1326                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1327                          buffer_length, min_buf_size);
1328                 return -EINVAL;
1329         }
1330
1331         /* check if beyond RFC1001 maximum length */
1332         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1333                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1334                          buffer_length, smb_len);
1335                 return -EINVAL;
1336         }
1337
1338         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1339                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1340                 return -EINVAL;
1341         }
1342
1343         return 0;
1344 }
1345
1346 /*
1347  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1348  * Caller must free buffer.
1349  */
1350 static int
1351 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1352                       struct smb2_hdr *hdr, unsigned int minbufsize,
1353                       char *data)
1354
1355 {
1356         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1357         int rc;
1358
1359         if (!data)
1360                 return -EINVAL;
1361
1362         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1363         if (rc)
1364                 return rc;
1365
1366         memcpy(data, begin_of_buf, buffer_length);
1367
1368         return 0;
1369 }
1370
1371 static int
1372 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1373            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1374            size_t output_len, size_t min_len, void *data)
1375 {
1376         struct smb2_query_info_req *req;
1377         struct smb2_query_info_rsp *rsp = NULL;
1378         struct kvec iov[2];
1379         int rc = 0;
1380         int resp_buftype;
1381         struct TCP_Server_Info *server;
1382         struct cifs_ses *ses = tcon->ses;
1383
1384         cifs_dbg(FYI, "Query Info\n");
1385
1386         if (ses && (ses->server))
1387                 server = ses->server;
1388         else
1389                 return -EIO;
1390
1391         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1392         if (rc)
1393                 return rc;
1394
1395         req->InfoType = SMB2_O_INFO_FILE;
1396         req->FileInfoClass = info_class;
1397         req->PersistentFileId = persistent_fid;
1398         req->VolatileFileId = volatile_fid;
1399         /* 4 for rfc1002 length field and 1 for Buffer */
1400         req->InputBufferOffset =
1401                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1402         req->OutputBufferLength = cpu_to_le32(output_len);
1403
1404         iov[0].iov_base = (char *)req;
1405         /* 4 for rfc1002 length field */
1406         iov[0].iov_len = get_rfc1002_length(req) + 4;
1407
1408         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1409         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1410
1411         if (rc) {
1412                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1413                 goto qinf_exit;
1414         }
1415
1416         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1417                                    le32_to_cpu(rsp->OutputBufferLength),
1418                                    &rsp->hdr, min_len, data);
1419
1420 qinf_exit:
1421         free_rsp_buf(resp_buftype, rsp);
1422         return rc;
1423 }
1424
1425 int
1426 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1427                 u64 persistent_fid, u64 volatile_fid,
1428                 struct smb2_file_all_info *data)
1429 {
1430         return query_info(xid, tcon, persistent_fid, volatile_fid,
1431                           FILE_ALL_INFORMATION,
1432                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1433                           sizeof(struct smb2_file_all_info), data);
1434 }
1435
1436 int
1437 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1438                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1439 {
1440         return query_info(xid, tcon, persistent_fid, volatile_fid,
1441                           FILE_INTERNAL_INFORMATION,
1442                           sizeof(struct smb2_file_internal_info),
1443                           sizeof(struct smb2_file_internal_info), uniqueid);
1444 }
1445
1446 /*
1447  * This is a no-op for now. We're not really interested in the reply, but
1448  * rather in the fact that the server sent one and that server->lstrp
1449  * gets updated.
1450  *
1451  * FIXME: maybe we should consider checking that the reply matches request?
1452  */
1453 static void
1454 smb2_echo_callback(struct mid_q_entry *mid)
1455 {
1456         struct TCP_Server_Info *server = mid->callback_data;
1457         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1458         unsigned int credits_received = 1;
1459
1460         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1461                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1462
1463         DeleteMidQEntry(mid);
1464         add_credits(server, credits_received, CIFS_ECHO_OP);
1465 }
1466
1467 int
1468 SMB2_echo(struct TCP_Server_Info *server)
1469 {
1470         struct smb2_echo_req *req;
1471         int rc = 0;
1472         struct kvec iov;
1473         struct smb_rqst rqst = { .rq_iov = &iov,
1474                                  .rq_nvec = 1 };
1475
1476         cifs_dbg(FYI, "In echo request\n");
1477
1478         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1479         if (rc)
1480                 return rc;
1481
1482         req->hdr.CreditRequest = cpu_to_le16(1);
1483
1484         iov.iov_base = (char *)req;
1485         /* 4 for rfc1002 length field */
1486         iov.iov_len = get_rfc1002_length(req) + 4;
1487
1488         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1489                              CIFS_ECHO_OP);
1490         if (rc)
1491                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1492
1493         cifs_small_buf_release(req);
1494         return rc;
1495 }
1496
1497 int
1498 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1499            u64 volatile_fid)
1500 {
1501         struct smb2_flush_req *req;
1502         struct TCP_Server_Info *server;
1503         struct cifs_ses *ses = tcon->ses;
1504         struct kvec iov[1];
1505         int resp_buftype;
1506         int rc = 0;
1507
1508         cifs_dbg(FYI, "Flush\n");
1509
1510         if (ses && (ses->server))
1511                 server = ses->server;
1512         else
1513                 return -EIO;
1514
1515         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1516         if (rc)
1517                 return rc;
1518
1519         req->PersistentFileId = persistent_fid;
1520         req->VolatileFileId = volatile_fid;
1521
1522         iov[0].iov_base = (char *)req;
1523         /* 4 for rfc1002 length field */
1524         iov[0].iov_len = get_rfc1002_length(req) + 4;
1525
1526         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1527
1528         if ((rc != 0) && tcon)
1529                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1530
1531         free_rsp_buf(resp_buftype, iov[0].iov_base);
1532         return rc;
1533 }
1534
1535 /*
1536  * To form a chain of read requests, any read requests after the first should
1537  * have the end_of_chain boolean set to true.
1538  */
1539 static int
1540 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1541                   unsigned int remaining_bytes, int request_type)
1542 {
1543         int rc = -EACCES;
1544         struct smb2_read_req *req = NULL;
1545
1546         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1547         if (rc)
1548                 return rc;
1549         if (io_parms->tcon->ses->server == NULL)
1550                 return -ECONNABORTED;
1551
1552         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1553
1554         req->PersistentFileId = io_parms->persistent_fid;
1555         req->VolatileFileId = io_parms->volatile_fid;
1556         req->ReadChannelInfoOffset = 0; /* reserved */
1557         req->ReadChannelInfoLength = 0; /* reserved */
1558         req->Channel = 0; /* reserved */
1559         req->MinimumCount = 0;
1560         req->Length = cpu_to_le32(io_parms->length);
1561         req->Offset = cpu_to_le64(io_parms->offset);
1562
1563         if (request_type & CHAINED_REQUEST) {
1564                 if (!(request_type & END_OF_CHAIN)) {
1565                         /* 4 for rfc1002 length field */
1566                         req->hdr.NextCommand =
1567                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1568                 } else /* END_OF_CHAIN */
1569                         req->hdr.NextCommand = 0;
1570                 if (request_type & RELATED_REQUEST) {
1571                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1572                         /*
1573                          * Related requests use info from previous read request
1574                          * in chain.
1575                          */
1576                         req->hdr.SessionId = 0xFFFFFFFF;
1577                         req->hdr.TreeId = 0xFFFFFFFF;
1578                         req->PersistentFileId = 0xFFFFFFFF;
1579                         req->VolatileFileId = 0xFFFFFFFF;
1580                 }
1581         }
1582         if (remaining_bytes > io_parms->length)
1583                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1584         else
1585                 req->RemainingBytes = 0;
1586
1587         iov[0].iov_base = (char *)req;
1588         /* 4 for rfc1002 length field */
1589         iov[0].iov_len = get_rfc1002_length(req) + 4;
1590         return rc;
1591 }
1592
1593 static void
1594 smb2_readv_callback(struct mid_q_entry *mid)
1595 {
1596         struct cifs_readdata *rdata = mid->callback_data;
1597         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1598         struct TCP_Server_Info *server = tcon->ses->server;
1599         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1600         unsigned int credits_received = 1;
1601         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1602                                  .rq_nvec = 1,
1603                                  .rq_pages = rdata->pages,
1604                                  .rq_npages = rdata->nr_pages,
1605                                  .rq_pagesz = rdata->pagesz,
1606                                  .rq_tailsz = rdata->tailsz };
1607
1608         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1609                  __func__, mid->mid, mid->mid_state, rdata->result,
1610                  rdata->bytes);
1611
1612         switch (mid->mid_state) {
1613         case MID_RESPONSE_RECEIVED:
1614                 credits_received = le16_to_cpu(buf->CreditRequest);
1615                 /* result already set, check signature */
1616                 if (server->sign) {
1617                         int rc;
1618
1619                         rc = smb2_verify_signature(&rqst, server);
1620                         if (rc)
1621                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1622                                          rc);
1623                 }
1624                 /* FIXME: should this be counted toward the initiating task? */
1625                 task_io_account_read(rdata->bytes);
1626                 cifs_stats_bytes_read(tcon, rdata->bytes);
1627                 break;
1628         case MID_REQUEST_SUBMITTED:
1629         case MID_RETRY_NEEDED:
1630                 rdata->result = -EAGAIN;
1631                 break;
1632         default:
1633                 if (rdata->result != -ENODATA)
1634                         rdata->result = -EIO;
1635         }
1636
1637         if (rdata->result)
1638                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1639
1640         queue_work(cifsiod_wq, &rdata->work);
1641         DeleteMidQEntry(mid);
1642         add_credits(server, credits_received, 0);
1643 }
1644
1645 /* smb2_async_readv - send an async write, and set up mid to handle result */
1646 int
1647 smb2_async_readv(struct cifs_readdata *rdata)
1648 {
1649         int rc;
1650         struct smb2_hdr *buf;
1651         struct cifs_io_parms io_parms;
1652         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1653                                  .rq_nvec = 1 };
1654
1655         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1656                  __func__, rdata->offset, rdata->bytes);
1657
1658         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1659         io_parms.offset = rdata->offset;
1660         io_parms.length = rdata->bytes;
1661         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1662         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1663         io_parms.pid = rdata->pid;
1664         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1665         if (rc)
1666                 return rc;
1667
1668         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1669         /* 4 for rfc1002 length field */
1670         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1671
1672         kref_get(&rdata->refcount);
1673         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1674                              cifs_readv_receive, smb2_readv_callback,
1675                              rdata, 0);
1676         if (rc) {
1677                 kref_put(&rdata->refcount, cifs_readdata_release);
1678                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1679         }
1680
1681         cifs_small_buf_release(buf);
1682         return rc;
1683 }
1684
1685 int
1686 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1687           unsigned int *nbytes, char **buf, int *buf_type)
1688 {
1689         int resp_buftype, rc = -EACCES;
1690         struct smb2_read_rsp *rsp = NULL;
1691         struct kvec iov[1];
1692
1693         *nbytes = 0;
1694         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1695         if (rc)
1696                 return rc;
1697
1698         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1699                           &resp_buftype, CIFS_LOG_ERROR);
1700
1701         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1702
1703         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1704                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1705                 return 0;
1706         }
1707
1708         if (rc) {
1709                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1710                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1711         } else {
1712                 *nbytes = le32_to_cpu(rsp->DataLength);
1713                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1714                     (*nbytes > io_parms->length)) {
1715                         cifs_dbg(FYI, "bad length %d for count %d\n",
1716                                  *nbytes, io_parms->length);
1717                         rc = -EIO;
1718                         *nbytes = 0;
1719                 }
1720         }
1721
1722         if (*buf) {
1723                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1724                        *nbytes);
1725                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1726         } else if (resp_buftype != CIFS_NO_BUFFER) {
1727                 *buf = iov[0].iov_base;
1728                 if (resp_buftype == CIFS_SMALL_BUFFER)
1729                         *buf_type = CIFS_SMALL_BUFFER;
1730                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1731                         *buf_type = CIFS_LARGE_BUFFER;
1732         }
1733         return rc;
1734 }
1735
1736 /*
1737  * Check the mid_state and signature on received buffer (if any), and queue the
1738  * workqueue completion task.
1739  */
1740 static void
1741 smb2_writev_callback(struct mid_q_entry *mid)
1742 {
1743         struct cifs_writedata *wdata = mid->callback_data;
1744         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1745         unsigned int written;
1746         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1747         unsigned int credits_received = 1;
1748
1749         switch (mid->mid_state) {
1750         case MID_RESPONSE_RECEIVED:
1751                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1752                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1753                 if (wdata->result != 0)
1754                         break;
1755
1756                 written = le32_to_cpu(rsp->DataLength);
1757                 /*
1758                  * Mask off high 16 bits when bytes written as returned
1759                  * by the server is greater than bytes requested by the
1760                  * client. OS/2 servers are known to set incorrect
1761                  * CountHigh values.
1762                  */
1763                 if (written > wdata->bytes)
1764                         written &= 0xFFFF;
1765
1766                 if (written < wdata->bytes)
1767                         wdata->result = -ENOSPC;
1768                 else
1769                         wdata->bytes = written;
1770                 break;
1771         case MID_REQUEST_SUBMITTED:
1772         case MID_RETRY_NEEDED:
1773                 wdata->result = -EAGAIN;
1774                 break;
1775         default:
1776                 wdata->result = -EIO;
1777                 break;
1778         }
1779
1780         if (wdata->result)
1781                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1782
1783         queue_work(cifsiod_wq, &wdata->work);
1784         DeleteMidQEntry(mid);
1785         add_credits(tcon->ses->server, credits_received, 0);
1786 }
1787
1788 /* smb2_async_writev - send an async write, and set up mid to handle result */
1789 int
1790 smb2_async_writev(struct cifs_writedata *wdata)
1791 {
1792         int rc = -EACCES;
1793         struct smb2_write_req *req = NULL;
1794         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1795         struct kvec iov;
1796         struct smb_rqst rqst;
1797
1798         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1799         if (rc)
1800                 goto async_writev_out;
1801
1802         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1803
1804         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1805         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1806         req->WriteChannelInfoOffset = 0;
1807         req->WriteChannelInfoLength = 0;
1808         req->Channel = 0;
1809         req->Offset = cpu_to_le64(wdata->offset);
1810         /* 4 for rfc1002 length field */
1811         req->DataOffset = cpu_to_le16(
1812                                 offsetof(struct smb2_write_req, Buffer) - 4);
1813         req->RemainingBytes = 0;
1814
1815         /* 4 for rfc1002 length field and 1 for Buffer */
1816         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1817         iov.iov_base = req;
1818
1819         rqst.rq_iov = &iov;
1820         rqst.rq_nvec = 1;
1821         rqst.rq_pages = wdata->pages;
1822         rqst.rq_npages = wdata->nr_pages;
1823         rqst.rq_pagesz = wdata->pagesz;
1824         rqst.rq_tailsz = wdata->tailsz;
1825
1826         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1827                  wdata->offset, wdata->bytes);
1828
1829         req->Length = cpu_to_le32(wdata->bytes);
1830
1831         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1832
1833         kref_get(&wdata->refcount);
1834         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1835                                 smb2_writev_callback, wdata, 0);
1836
1837         if (rc) {
1838                 kref_put(&wdata->refcount, cifs_writedata_release);
1839                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1840         }
1841
1842 async_writev_out:
1843         cifs_small_buf_release(req);
1844         return rc;
1845 }
1846
1847 /*
1848  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1849  * The length field from io_parms must be at least 1 and indicates a number of
1850  * elements with data to write that begins with position 1 in iov array. All
1851  * data length is specified by count.
1852  */
1853 int
1854 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1855            unsigned int *nbytes, struct kvec *iov, int n_vec)
1856 {
1857         int rc = 0;
1858         struct smb2_write_req *req = NULL;
1859         struct smb2_write_rsp *rsp = NULL;
1860         int resp_buftype;
1861         *nbytes = 0;
1862
1863         if (n_vec < 1)
1864                 return rc;
1865
1866         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1867         if (rc)
1868                 return rc;
1869
1870         if (io_parms->tcon->ses->server == NULL)
1871                 return -ECONNABORTED;
1872
1873         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1874
1875         req->PersistentFileId = io_parms->persistent_fid;
1876         req->VolatileFileId = io_parms->volatile_fid;
1877         req->WriteChannelInfoOffset = 0;
1878         req->WriteChannelInfoLength = 0;
1879         req->Channel = 0;
1880         req->Length = cpu_to_le32(io_parms->length);
1881         req->Offset = cpu_to_le64(io_parms->offset);
1882         /* 4 for rfc1002 length field */
1883         req->DataOffset = cpu_to_le16(
1884                                 offsetof(struct smb2_write_req, Buffer) - 4);
1885         req->RemainingBytes = 0;
1886
1887         iov[0].iov_base = (char *)req;
1888         /* 4 for rfc1002 length field and 1 for Buffer */
1889         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1890
1891         /* length of entire message including data to be written */
1892         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1893
1894         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1895                           &resp_buftype, 0);
1896         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1897
1898         if (rc) {
1899                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1900                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1901         } else
1902                 *nbytes = le32_to_cpu(rsp->DataLength);
1903
1904         free_rsp_buf(resp_buftype, rsp);
1905         return rc;
1906 }
1907
1908 static unsigned int
1909 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1910 {
1911         int len;
1912         unsigned int entrycount = 0;
1913         unsigned int next_offset = 0;
1914         FILE_DIRECTORY_INFO *entryptr;
1915
1916         if (bufstart == NULL)
1917                 return 0;
1918
1919         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1920
1921         while (1) {
1922                 entryptr = (FILE_DIRECTORY_INFO *)
1923                                         ((char *)entryptr + next_offset);
1924
1925                 if ((char *)entryptr + size > end_of_buf) {
1926                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1927                         break;
1928                 }
1929
1930                 len = le32_to_cpu(entryptr->FileNameLength);
1931                 if ((char *)entryptr + len + size > end_of_buf) {
1932                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1933                                  end_of_buf);
1934                         break;
1935                 }
1936
1937                 *lastentry = (char *)entryptr;
1938                 entrycount++;
1939
1940                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1941                 if (!next_offset)
1942                         break;
1943         }
1944
1945         return entrycount;
1946 }
1947
1948 /*
1949  * Readdir/FindFirst
1950  */
1951 int
1952 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1953                      u64 persistent_fid, u64 volatile_fid, int index,
1954                      struct cifs_search_info *srch_inf)
1955 {
1956         struct smb2_query_directory_req *req;
1957         struct smb2_query_directory_rsp *rsp = NULL;
1958         struct kvec iov[2];
1959         int rc = 0;
1960         int len;
1961         int resp_buftype;
1962         unsigned char *bufptr;
1963         struct TCP_Server_Info *server;
1964         struct cifs_ses *ses = tcon->ses;
1965         __le16 asteriks = cpu_to_le16('*');
1966         char *end_of_smb;
1967         unsigned int output_size = CIFSMaxBufSize;
1968         size_t info_buf_size;
1969
1970         if (ses && (ses->server))
1971                 server = ses->server;
1972         else
1973                 return -EIO;
1974
1975         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1976         if (rc)
1977                 return rc;
1978
1979         switch (srch_inf->info_level) {
1980         case SMB_FIND_FILE_DIRECTORY_INFO:
1981                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1982                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1983                 break;
1984         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1985                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1986                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1987                 break;
1988         default:
1989                 cifs_dbg(VFS, "info level %u isn't supported\n",
1990                          srch_inf->info_level);
1991                 rc = -EINVAL;
1992                 goto qdir_exit;
1993         }
1994
1995         req->FileIndex = cpu_to_le32(index);
1996         req->PersistentFileId = persistent_fid;
1997         req->VolatileFileId = volatile_fid;
1998
1999         len = 0x2;
2000         bufptr = req->Buffer;
2001         memcpy(bufptr, &asteriks, len);
2002
2003         req->FileNameOffset =
2004                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2005         req->FileNameLength = cpu_to_le16(len);
2006         /*
2007          * BB could be 30 bytes or so longer if we used SMB2 specific
2008          * buffer lengths, but this is safe and close enough.
2009          */
2010         output_size = min_t(unsigned int, output_size, server->maxBuf);
2011         output_size = min_t(unsigned int, output_size, 2 << 15);
2012         req->OutputBufferLength = cpu_to_le32(output_size);
2013
2014         iov[0].iov_base = (char *)req;
2015         /* 4 for RFC1001 length and 1 for Buffer */
2016         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2017
2018         iov[1].iov_base = (char *)(req->Buffer);
2019         iov[1].iov_len = len;
2020
2021         inc_rfc1001_len(req, len - 1 /* Buffer */);
2022
2023         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2024         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2025
2026         if (rc) {
2027                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2028                 goto qdir_exit;
2029         }
2030
2031         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2032                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2033                           info_buf_size);
2034         if (rc)
2035                 goto qdir_exit;
2036
2037         srch_inf->unicode = true;
2038
2039         if (srch_inf->ntwrk_buf_start) {
2040                 if (srch_inf->smallBuf)
2041                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2042                 else
2043                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2044         }
2045         srch_inf->ntwrk_buf_start = (char *)rsp;
2046         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2047                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2048         /* 4 for rfc1002 length field */
2049         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2050         srch_inf->entries_in_buffer =
2051                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2052                                     &srch_inf->last_entry, info_buf_size);
2053         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2054         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2055                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2056                  srch_inf->srch_entries_start, srch_inf->last_entry);
2057         if (resp_buftype == CIFS_LARGE_BUFFER)
2058                 srch_inf->smallBuf = false;
2059         else if (resp_buftype == CIFS_SMALL_BUFFER)
2060                 srch_inf->smallBuf = true;
2061         else
2062                 cifs_dbg(VFS, "illegal search buffer type\n");
2063
2064         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2065                 srch_inf->endOfSearch = 1;
2066         else
2067                 srch_inf->endOfSearch = 0;
2068
2069         return rc;
2070
2071 qdir_exit:
2072         free_rsp_buf(resp_buftype, rsp);
2073         return rc;
2074 }
2075
2076 static int
2077 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2078                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2079                unsigned int num, void **data, unsigned int *size)
2080 {
2081         struct smb2_set_info_req *req;
2082         struct smb2_set_info_rsp *rsp = NULL;
2083         struct kvec *iov;
2084         int rc = 0;
2085         int resp_buftype;
2086         unsigned int i;
2087         struct TCP_Server_Info *server;
2088         struct cifs_ses *ses = tcon->ses;
2089
2090         if (ses && (ses->server))
2091                 server = ses->server;
2092         else
2093                 return -EIO;
2094
2095         if (!num)
2096                 return -EINVAL;
2097
2098         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2099         if (!iov)
2100                 return -ENOMEM;
2101
2102         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2103         if (rc) {
2104                 kfree(iov);
2105                 return rc;
2106         }
2107
2108         req->hdr.ProcessId = cpu_to_le32(pid);
2109
2110         req->InfoType = SMB2_O_INFO_FILE;
2111         req->FileInfoClass = info_class;
2112         req->PersistentFileId = persistent_fid;
2113         req->VolatileFileId = volatile_fid;
2114
2115         /* 4 for RFC1001 length and 1 for Buffer */
2116         req->BufferOffset =
2117                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2118         req->BufferLength = cpu_to_le32(*size);
2119
2120         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2121
2122         memcpy(req->Buffer, *data, *size);
2123
2124         iov[0].iov_base = (char *)req;
2125         /* 4 for RFC1001 length */
2126         iov[0].iov_len = get_rfc1002_length(req) + 4;
2127
2128         for (i = 1; i < num; i++) {
2129                 inc_rfc1001_len(req, size[i]);
2130                 le32_add_cpu(&req->BufferLength, size[i]);
2131                 iov[i].iov_base = (char *)data[i];
2132                 iov[i].iov_len = size[i];
2133         }
2134
2135         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2136         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2137
2138         if (rc != 0) {
2139                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2140                 goto out;
2141         }
2142 out:
2143         free_rsp_buf(resp_buftype, rsp);
2144         kfree(iov);
2145         return rc;
2146 }
2147
2148 int
2149 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2150             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2151 {
2152         struct smb2_file_rename_info info;
2153         void **data;
2154         unsigned int size[2];
2155         int rc;
2156         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2157
2158         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2159         if (!data)
2160                 return -ENOMEM;
2161
2162         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2163                               /* 0 = fail if target already exists */
2164         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2165         info.FileNameLength = cpu_to_le32(len);
2166
2167         data[0] = &info;
2168         size[0] = sizeof(struct smb2_file_rename_info);
2169
2170         data[1] = target_file;
2171         size[1] = len + 2 /* null */;
2172
2173         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2174                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2175                            size);
2176         kfree(data);
2177         return rc;
2178 }
2179
2180 int
2181 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2182                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2183 {
2184         struct smb2_file_link_info info;
2185         void **data;
2186         unsigned int size[2];
2187         int rc;
2188         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2189
2190         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2191         if (!data)
2192                 return -ENOMEM;
2193
2194         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2195                               /* 0 = fail if link already exists */
2196         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2197         info.FileNameLength = cpu_to_le32(len);
2198
2199         data[0] = &info;
2200         size[0] = sizeof(struct smb2_file_link_info);
2201
2202         data[1] = target_file;
2203         size[1] = len + 2 /* null */;
2204
2205         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2206                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2207         kfree(data);
2208         return rc;
2209 }
2210
2211 int
2212 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2213              u64 volatile_fid, u32 pid, __le64 *eof)
2214 {
2215         struct smb2_file_eof_info info;
2216         void *data;
2217         unsigned int size;
2218
2219         info.EndOfFile = *eof;
2220
2221         data = &info;
2222         size = sizeof(struct smb2_file_eof_info);
2223
2224         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2225                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2226 }
2227
2228 int
2229 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2230               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2231 {
2232         unsigned int size;
2233         size = sizeof(FILE_BASIC_INFO);
2234         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2235                              current->tgid, FILE_BASIC_INFORMATION, 1,
2236                              (void **)&buf, &size);
2237 }
2238
2239 int
2240 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2241                   const u64 persistent_fid, const u64 volatile_fid,
2242                   __u8 oplock_level)
2243 {
2244         int rc;
2245         struct smb2_oplock_break *req = NULL;
2246
2247         cifs_dbg(FYI, "SMB2_oplock_break\n");
2248         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2249
2250         if (rc)
2251                 return rc;
2252
2253         req->VolatileFid = volatile_fid;
2254         req->PersistentFid = persistent_fid;
2255         req->OplockLevel = oplock_level;
2256         req->hdr.CreditRequest = cpu_to_le16(1);
2257
2258         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2259         /* SMB2 buffer freed by function above */
2260
2261         if (rc) {
2262                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2263                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2264         }
2265
2266         return rc;
2267 }
2268
2269 static void
2270 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2271                         struct kstatfs *kst)
2272 {
2273         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2274                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2275         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2276         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2277         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2278         return;
2279 }
2280
2281 static int
2282 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2283                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2284 {
2285         int rc;
2286         struct smb2_query_info_req *req;
2287
2288         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2289
2290         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2291                 return -EIO;
2292
2293         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2294         if (rc)
2295                 return rc;
2296
2297         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2298         req->FileInfoClass = level;
2299         req->PersistentFileId = persistent_fid;
2300         req->VolatileFileId = volatile_fid;
2301         /* 4 for rfc1002 length field and 1 for pad */
2302         req->InputBufferOffset =
2303                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2304         req->OutputBufferLength = cpu_to_le32(
2305                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2306
2307         iov->iov_base = (char *)req;
2308         /* 4 for rfc1002 length field */
2309         iov->iov_len = get_rfc1002_length(req) + 4;
2310         return 0;
2311 }
2312
2313 int
2314 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2315               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2316 {
2317         struct smb2_query_info_rsp *rsp = NULL;
2318         struct kvec iov;
2319         int rc = 0;
2320         int resp_buftype;
2321         struct cifs_ses *ses = tcon->ses;
2322         struct smb2_fs_full_size_info *info = NULL;
2323
2324         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2325                                 sizeof(struct smb2_fs_full_size_info),
2326                                 persistent_fid, volatile_fid);
2327         if (rc)
2328                 return rc;
2329
2330         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2331         if (rc) {
2332                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2333                 goto qinf_exit;
2334         }
2335         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2336
2337         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2338                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2339         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2340                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2341                           sizeof(struct smb2_fs_full_size_info));
2342         if (!rc)
2343                 copy_fs_info_to_kstatfs(info, fsdata);
2344
2345 qinf_exit:
2346         free_rsp_buf(resp_buftype, iov.iov_base);
2347         return rc;
2348 }
2349
2350 int
2351 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2352            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2353            const __u32 num_lock, struct smb2_lock_element *buf)
2354 {
2355         int rc = 0;
2356         struct smb2_lock_req *req = NULL;
2357         struct kvec iov[2];
2358         int resp_buf_type;
2359         unsigned int count;
2360
2361         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2362
2363         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2364         if (rc)
2365                 return rc;
2366
2367         req->hdr.ProcessId = cpu_to_le32(pid);
2368         req->LockCount = cpu_to_le16(num_lock);
2369
2370         req->PersistentFileId = persist_fid;
2371         req->VolatileFileId = volatile_fid;
2372
2373         count = num_lock * sizeof(struct smb2_lock_element);
2374         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2375
2376         iov[0].iov_base = (char *)req;
2377         /* 4 for rfc1002 length field and count for all locks */
2378         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2379         iov[1].iov_base = (char *)buf;
2380         iov[1].iov_len = count;
2381
2382         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2383         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2384         if (rc) {
2385                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2386                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2387         }
2388
2389         return rc;
2390 }
2391
2392 int
2393 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2394           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2395           const __u64 length, const __u64 offset, const __u32 lock_flags,
2396           const bool wait)
2397 {
2398         struct smb2_lock_element lock;
2399
2400         lock.Offset = cpu_to_le64(offset);
2401         lock.Length = cpu_to_le64(length);
2402         lock.Flags = cpu_to_le32(lock_flags);
2403         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2404                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2405
2406         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2407 }
2408
2409 int
2410 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2411                  __u8 *lease_key, const __le32 lease_state)
2412 {
2413         int rc;
2414         struct smb2_lease_ack *req = NULL;
2415
2416         cifs_dbg(FYI, "SMB2_lease_break\n");
2417         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2418
2419         if (rc)
2420                 return rc;
2421
2422         req->hdr.CreditRequest = cpu_to_le16(1);
2423         req->StructureSize = cpu_to_le16(36);
2424         inc_rfc1001_len(req, 12);
2425
2426         memcpy(req->LeaseKey, lease_key, 16);
2427         req->LeaseState = lease_state;
2428
2429         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2430         /* SMB2 buffer freed by function above */
2431
2432         if (rc) {
2433                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2434                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2435         }
2436
2437         return rc;
2438 }