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 ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server = ses->server;
 468         u16 blob_length = 0;
 469         char *security_blob;
 470         char *ntlmssp_blob = NULL;
 471         bool use_spnego = false; /* else use raw ntlmssp */
 472
 473         cifs_dbg(FYI, "Session Setup\n");
 474
 475         if (!server) {
 476                 WARN(1, "%s: server is NULL!\n", __func__);
 477                 return -EIO;
 478         }
 479
 480         /*
 481          * If we are here due to reconnect, free per-smb session key
 482          * in case signing was required.
 483          */
 484         kfree(ses->auth_key.response);
 485         ses->auth_key.response = NULL;
 486
 487         /*
 488          * If memory allocation is successful, caller of this function
 489          * frees it.
 490          */
 491         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 492         if (!ses->ntlmssp)
 493                 return -ENOMEM;
 494         ses->ntlmssp->sesskey_per_smbsess = true;
 495
 496         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 497         ses->sectype = RawNTLMSSP;
 498
 499 ssetup_ntlmssp_authenticate:
 500         if (phase == NtLmChallenge)
 501                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 502
 503         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 504         if (rc)
 505                 return rc;
 506
 507         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 508         req->VcNumber = 0; /* MBZ */
 509         /* to enable echos and oplocks */
 510         req->hdr.CreditRequest = cpu_to_le16(3);
 511
 512         /* only one of SMB2 signing flags may be set in SMB2 request */
 513         if (server->sign)
 514                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 515         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 516                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 517         else
 518                 req->SecurityMode = 0;
 519
 520         req->Capabilities = 0;
 521         req->Channel = 0; /* MBZ */
 522
 523         iov[0].iov_base = (char *)req;
 524         /* 4 for rfc1002 length field and 1 for pad */
 525         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 526         if (phase == NtLmNegotiate) {
 527                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 528                                        GFP_KERNEL);
 529                 if (ntlmssp_blob == NULL) {
 530                         rc = -ENOMEM;
 531                         goto ssetup_exit;
 532                 }
 533                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 534                 if (use_spnego) {
 535                         /* blob_length = build_spnego_ntlmssp_blob(
 536                                         &security_blob,
 537                                         sizeof(struct _NEGOTIATE_MESSAGE),
 538                                         ntlmssp_blob); */
 539                         /* BB eventually need to add this */
 540                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 541                         rc = -EOPNOTSUPP;
 542                         kfree(ntlmssp_blob);
 543                         goto ssetup_exit;
 544                 } else {
 545                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 546                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 547                         security_blob = ntlmssp_blob;
 548                 }
 549         } else if (phase == NtLmAuthenticate) {
 550                 req->hdr.SessionId = ses->Suid;
 551                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 552                                        GFP_KERNEL);
 553                 if (ntlmssp_blob == NULL) {
 554                         rc = -ENOMEM;
 555                         goto ssetup_exit;
 556                 }
 557                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 558                                              nls_cp);
 559                 if (rc) {
 560                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 561                                  rc);
 562                         goto ssetup_exit; /* BB double check error handling */
 563                 }
 564                 if (use_spnego) {
 565                         /* blob_length = build_spnego_ntlmssp_blob(
 566                                                         &security_blob,
 567                                                         blob_length,
 568                                                         ntlmssp_blob); */
 569                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 570                         rc = -EOPNOTSUPP;
 571                         kfree(ntlmssp_blob);
 572                         goto ssetup_exit;
 573                 } else {
 574                         security_blob = ntlmssp_blob;
 575                 }
 576         } else {
 577                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 578                 rc = -EIO;
 579                 goto ssetup_exit;
 580         }
 581
 582         /* Testing shows that buffer offset must be at location of Buffer[0] */
 583         req->SecurityBufferOffset =
 584                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 585                                             1 /* pad */ - 4 /* rfc1001 len */);
 586         req->SecurityBufferLength = cpu_to_le16(blob_length);
 587         iov[1].iov_base = security_blob;
 588         iov[1].iov_len = blob_length;
 589
 590         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 591
 592         /* BB add code to build os and lm fields */
 593
 594         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 595                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 596
 597         kfree(security_blob);
 598         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 599         if (resp_buftype != CIFS_NO_BUFFER &&
 600             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 601                 if (phase != NtLmNegotiate) {
 602                         cifs_dbg(VFS, "Unexpected more processing error\n");
 603                         goto ssetup_exit;
 604                 }
 605                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 606                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 607                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 608                                  le16_to_cpu(rsp->SecurityBufferOffset));
 609                         rc = -EIO;
 610                         goto ssetup_exit;
 611                 }
 612
 613                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 614                 phase = NtLmChallenge; /* process ntlmssp challenge */
 615                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 616                 ses->Suid = rsp->hdr.SessionId;
 617                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 618                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 619         }
 620
 621         /*
 622          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 623          * but at least the raw NTLMSSP case works.
 624          */
 625         /*
 626          * No tcon so can't do
 627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 628          */
 629         if (rc != 0)
 630                 goto ssetup_exit;
 631
 632         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 633 ssetup_exit:
 634         free_rsp_buf(resp_buftype, rsp);
 635
 636         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 637         if ((phase == NtLmChallenge) && (rc == 0))
 638                 goto ssetup_ntlmssp_authenticate;
 639
 640         if (!rc) {
 641                 mutex_lock(&server->srv_mutex);
 642                 if (server->sign && server->ops->generate_signingkey) {
 643                         rc = server->ops->generate_signingkey(ses);
 644                         kfree(ses->auth_key.response);
 645                         ses->auth_key.response = NULL;
 646                         if (rc) {
 647                                 cifs_dbg(FYI,
 648                                         "SMB3 session key generation failed\n");
 649                                 mutex_unlock(&server->srv_mutex);
 650                                 goto keygen_exit;
 651                         }
 652                 }
 653                 if (!server->session_estab) {
 654                         server->sequence_number = 0x2;
 655                         server->session_estab = true;
 656                 }
 657                 mutex_unlock(&server->srv_mutex);
 658
 659                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 660                 spin_lock(&GlobalMid_Lock);
 661                 ses->status = CifsGood;
 662                 ses->need_reconnect = false;
 663                 spin_unlock(&GlobalMid_Lock);
 664         }
 665
 666 keygen_exit:
 667         if (!server->sign) {
 668                 kfree(ses->auth_key.response);
 669                 ses->auth_key.response = NULL;
 670         }
 671         kfree(ses->ntlmssp);
 672
 673         return rc;
 674 }
 675
 676 int
 677 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 678 {
 679         struct smb2_logoff_req *req; /* response is also trivial struct */
 680         int rc = 0;
 681         struct TCP_Server_Info *server;
 682
 683         cifs_dbg(FYI, "disconnect session %p\n", ses);
 684
 685         if (ses && (ses->server))
 686                 server = ses->server;
 687         else
 688                 return -EIO;
 689
 690         /* no need to send SMB logoff if uid already closed due to reconnect */
 691         if (ses->need_reconnect)
 692                 goto smb2_session_already_dead;
 693
 694         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 695         if (rc)
 696                 return rc;
 697
 698          /* since no tcon, smb2_init can not do this, so do here */
 699         req->hdr.SessionId = ses->Suid;
 700         if (server->sign)
 701                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 702
 703         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 704         /*
 705          * No tcon so can't do
 706          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 707          */
 708
 709 smb2_session_already_dead:
 710         return rc;
 711 }
 712
 713 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 714 {
 715         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 716 }
 717
 718 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 719
 720 int
 721 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 722           struct cifs_tcon *tcon, const struct nls_table *cp)
 723 {
 724         struct smb2_tree_connect_req *req;
 725         struct smb2_tree_connect_rsp *rsp = NULL;
 726         struct kvec iov[2];
 727         int rc = 0;
 728         int resp_buftype;
 729         int unc_path_len;
 730         struct TCP_Server_Info *server;
 731         __le16 *unc_path = NULL;
 732
 733         cifs_dbg(FYI, "TCON\n");
 734
 735         if ((ses->server) && tree)
 736                 server = ses->server;
 737         else
 738                 return -EIO;
 739
 740         if (tcon && tcon->bad_network_name)
 741                 return -ENOENT;
 742
 743         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 744         if (unc_path == NULL)
 745                 return -ENOMEM;
 746
 747         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 748         unc_path_len *= 2;
 749         if (unc_path_len < 2) {
 750                 kfree(unc_path);
 751                 return -EINVAL;
 752         }
 753
 754         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 755         if (rc) {
 756                 kfree(unc_path);
 757                 return rc;
 758         }
 759
 760         if (tcon == NULL) {
 761                 /* since no tcon, smb2_init can not do this, so do here */
 762                 req->hdr.SessionId = ses->Suid;
 763                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 764                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 765         }
 766
 767         iov[0].iov_base = (char *)req;
 768         /* 4 for rfc1002 length field and 1 for pad */
 769         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 770
 771         /* Testing shows that buffer offset must be at location of Buffer[0] */
 772         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 773                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 774         req->PathLength = cpu_to_le16(unc_path_len - 2);
 775         iov[1].iov_base = unc_path;
 776         iov[1].iov_len = unc_path_len;
 777
 778         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 779
 780         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 781         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 782
 783         if (rc != 0) {
 784                 if (tcon) {
 785                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 786                         tcon->need_reconnect = true;
 787                 }
 788                 goto tcon_error_exit;
 789         }
 790
 791         if (tcon == NULL) {
 792                 ses->ipc_tid = rsp->hdr.TreeId;
 793                 goto tcon_exit;
 794         }
 795
 796         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 797                 cifs_dbg(FYI, "connection to disk share\n");
 798         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 799                 tcon->ipc = true;
 800                 cifs_dbg(FYI, "connection to pipe share\n");
 801         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 802                 tcon->print = true;
 803                 cifs_dbg(FYI, "connection to printer\n");
 804         } else {
 805                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 806                 rc = -EOPNOTSUPP;
 807                 goto tcon_error_exit;
 808         }
 809
 810         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 811         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 812         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 813         tcon->tidStatus = CifsGood;
 814         tcon->need_reconnect = false;
 815         tcon->tid = rsp->hdr.TreeId;
 816         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 817
 818         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 819             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 820                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 821
 822 tcon_exit:
 823         free_rsp_buf(resp_buftype, rsp);
 824         kfree(unc_path);
 825         return rc;
 826
 827 tcon_error_exit:
 828         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 829                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 830                 tcon->bad_network_name = true;
 831         }
 832         goto tcon_exit;
 833 }
 834
 835 int
 836 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 837 {
 838         struct smb2_tree_disconnect_req *req; /* response is trivial */
 839         int rc = 0;
 840         struct TCP_Server_Info *server;
 841         struct cifs_ses *ses = tcon->ses;
 842
 843         cifs_dbg(FYI, "Tree Disconnect\n");
 844
 845         if (ses && (ses->server))
 846                 server = ses->server;
 847         else
 848                 return -EIO;
 849
 850         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 851                 return 0;
 852
 853         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 854         if (rc)
 855                 return rc;
 856
 857         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 858         if (rc)
 859                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 860
 861         return rc;
 862 }
 863
 864
 865 static struct create_durable *
 866 create_durable_buf(void)
 867 {
 868         struct create_durable *buf;
 869
 870         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 871         if (!buf)
 872                 return NULL;
 873
 874         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 875                                         (struct create_durable, Data));
 876         buf->ccontext.DataLength = cpu_to_le32(16);
 877         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 878                                 (struct create_durable, Name));
 879         buf->ccontext.NameLength = cpu_to_le16(4);
 880         buf->Name[0] = 'D';
 881         buf->Name[1] = 'H';
 882         buf->Name[2] = 'n';
 883         buf->Name[3] = 'Q';
 884         return buf;
 885 }
 886
 887 static struct create_durable *
 888 create_reconnect_durable_buf(struct cifs_fid *fid)
 889 {
 890         struct create_durable *buf;
 891
 892         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 893         if (!buf)
 894                 return NULL;
 895
 896         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 897                                         (struct create_durable, Data));
 898         buf->ccontext.DataLength = cpu_to_le32(16);
 899         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 900                                 (struct create_durable, Name));
 901         buf->ccontext.NameLength = cpu_to_le16(4);
 902         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 903         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 904         buf->Name[0] = 'D';
 905         buf->Name[1] = 'H';
 906         buf->Name[2] = 'n';
 907         buf->Name[3] = 'C';
 908         return buf;
 909 }
 910
 911 static __u8
 912 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
 913                   unsigned int *epoch)
 914 {
 915         char *data_offset;
 916         struct create_context *cc;
 917         unsigned int next = 0;
 918         char *name;
 919
 920         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 921         cc = (struct create_context *)data_offset;
 922         do {
 923                 cc = (struct create_context *)((char *)cc + next);
 924                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
 925                 if (le16_to_cpu(cc->NameLength) != 4 ||
 926                     strncmp(name, "RqLs", 4)) {
 927                         next = le32_to_cpu(cc->Next);
 928                         continue;
 929                 }
 930                 return server->ops->parse_lease_buf(cc, epoch);
 931         } while (next != 0);
 932
 933         return 0;
 934 }
 935
 936 static int
 937 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
 938                   unsigned int *num_iovec, __u8 *oplock)
 939 {
 940         struct smb2_create_req *req = iov[0].iov_base;
 941         unsigned int num = *num_iovec;
 942
 943         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
 944         if (iov[num].iov_base == NULL)
 945                 return -ENOMEM;
 946         iov[num].iov_len = server->vals->create_lease_size;
 947         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 948         if (!req->CreateContextsOffset)
 949                 req->CreateContextsOffset = cpu_to_le32(
 950                                 sizeof(struct smb2_create_req) - 4 +
 951                                 iov[num - 1].iov_len);
 952         le32_add_cpu(&req->CreateContextsLength,
 953                      server->vals->create_lease_size);
 954         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
 955         *num_iovec = num + 1;
 956         return 0;
 957 }
 958
 959 static int
 960 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 961                     struct cifs_open_parms *oparms)
 962 {
 963         struct smb2_create_req *req = iov[0].iov_base;
 964         unsigned int num = *num_iovec;
 965
 966         if (oparms->reconnect) {
 967                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 968                 /* indicate that we don't need to relock the file */
 969                 oparms->reconnect = false;
 970         } else
 971                 iov[num].iov_base = create_durable_buf();
 972         if (iov[num].iov_base == NULL)
 973                 return -ENOMEM;
 974         iov[num].iov_len = sizeof(struct create_durable);
 975         if (!req->CreateContextsOffset)
 976                 req->CreateContextsOffset =
 977                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 978                                                                 iov[1].iov_len);
 979         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
 980         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
 981         *num_iovec = num + 1;
 982         return 0;
 983 }
 984
 985 int
 986 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
 987           __u8 *oplock, struct smb2_file_all_info *buf,
 988           struct smb2_err_rsp **err_buf)
 989 {
 990         struct smb2_create_req *req;
 991         struct smb2_create_rsp *rsp;
 992         struct TCP_Server_Info *server;
 993         struct cifs_tcon *tcon = oparms->tcon;
 994         struct cifs_ses *ses = tcon->ses;
 995         struct kvec iov[4];
 996         int resp_buftype;
 997         int uni_path_len;
 998         __le16 *copy_path = NULL;
 999         int copy_size;
1000         int rc = 0;
1001         unsigned int num_iovecs = 2;
1002         __u32 file_attributes = 0;
1003
1004         cifs_dbg(FYI, "create/open\n");
1005
1006         if (ses && (ses->server))
1007                 server = ses->server;
1008         else
1009                 return -EIO;
1010
1011         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1012         if (rc)
1013                 return rc;
1014
1015         if (oparms->create_options & CREATE_OPTION_READONLY)
1016                 file_attributes |= ATTR_READONLY;
1017
1018         req->ImpersonationLevel = IL_IMPERSONATION;
1019         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1020         /* File attributes ignored on open (used in create though) */
1021         req->FileAttributes = cpu_to_le32(file_attributes);
1022         req->ShareAccess = FILE_SHARE_ALL_LE;
1023         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1024         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1025         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1026         /* do not count rfc1001 len field */
1027         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1028
1029         iov[0].iov_base = (char *)req;
1030         /* 4 for rfc1002 length field */
1031         iov[0].iov_len = get_rfc1002_length(req) + 4;
1032
1033         /* MUST set path len (NameLength) to 0 opening root of share */
1034         req->NameLength = cpu_to_le16(uni_path_len - 2);
1035         /* -1 since last byte is buf[0] which is sent below (path) */
1036         iov[0].iov_len--;
1037         if (uni_path_len % 8 != 0) {
1038                 copy_size = uni_path_len / 8 * 8;
1039                 if (copy_size < uni_path_len)
1040                         copy_size += 8;
1041
1042                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1043                 if (!copy_path)
1044                         return -ENOMEM;
1045                 memcpy((char *)copy_path, (const char *)path,
1046                         uni_path_len);
1047                 uni_path_len = copy_size;
1048                 path = copy_path;
1049         }
1050
1051         iov[1].iov_len = uni_path_len;
1052         iov[1].iov_base = path;
1053         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1054         inc_rfc1001_len(req, uni_path_len - 1);
1055
1056         if (!server->oplocks)
1057                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1058
1059         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1060             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1061                 req->RequestedOplockLevel = *oplock;
1062         else {
1063                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1064                 if (rc) {
1065                         cifs_small_buf_release(req);
1066                         kfree(copy_path);
1067                         return rc;
1068                 }
1069         }
1070
1071         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1072                 /* need to set Next field of lease context if we request it */
1073                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1074                         struct create_context *ccontext =
1075                             (struct create_context *)iov[num_iovecs-1].iov_base;
1076                         ccontext->Next =
1077                                 cpu_to_le32(server->vals->create_lease_size);
1078                 }
1079                 rc = add_durable_context(iov, &num_iovecs, oparms);
1080                 if (rc) {
1081                         cifs_small_buf_release(req);
1082                         kfree(copy_path);
1083                         kfree(iov[num_iovecs-1].iov_base);
1084                         return rc;
1085                 }
1086         }
1087
1088         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1089         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1090
1091         if (rc != 0) {
1092                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1093                 if (err_buf)
1094                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1095                                            GFP_KERNEL);
1096                 goto creat_exit;
1097         }
1098
1099         oparms->fid->persistent_fid = rsp->PersistentFileId;
1100         oparms->fid->volatile_fid = rsp->VolatileFileId;
1101
1102         if (buf) {
1103                 memcpy(buf, &rsp->CreationTime, 32);
1104                 buf->AllocationSize = rsp->AllocationSize;
1105                 buf->EndOfFile = rsp->EndofFile;
1106                 buf->Attributes = rsp->FileAttributes;
1107                 buf->NumberOfLinks = cpu_to_le32(1);
1108                 buf->DeletePending = 0;
1109         }
1110
1111         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1112                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1113         else
1114                 *oplock = rsp->OplockLevel;
1115 creat_exit:
1116         kfree(copy_path);
1117         free_rsp_buf(resp_buftype, rsp);
1118         return rc;
1119 }
1120
1121 /*
1122  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1123  */
1124 int
1125 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1126            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1127            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1128 {
1129         struct smb2_ioctl_req *req;
1130         struct smb2_ioctl_rsp *rsp;
1131         struct TCP_Server_Info *server;
1132         struct cifs_ses *ses = tcon->ses;
1133         struct kvec iov[2];
1134         int resp_buftype;
1135         int num_iovecs;
1136         int rc = 0;
1137
1138         cifs_dbg(FYI, "SMB2 IOCTL\n");
1139
1140         *out_data = NULL;
1141         /* zero out returned data len, in case of error */
1142         if (plen)
1143                 *plen = 0;
1144
1145         if (ses && (ses->server))
1146                 server = ses->server;
1147         else
1148                 return -EIO;
1149
1150         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1151         if (rc)
1152                 return rc;
1153
1154         req->CtlCode = cpu_to_le32(opcode);
1155         req->PersistentFileId = persistent_fid;
1156         req->VolatileFileId = volatile_fid;
1157
1158         if (indatalen) {
1159                 req->InputCount = cpu_to_le32(indatalen);
1160                 /* do not set InputOffset if no input data */
1161                 req->InputOffset =
1162                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1163                 iov[1].iov_base = in_data;
1164                 iov[1].iov_len = indatalen;
1165                 num_iovecs = 2;
1166         } else
1167                 num_iovecs = 1;
1168
1169         req->OutputOffset = 0;
1170         req->OutputCount = 0; /* MBZ */
1171
1172         /*
1173          * Could increase MaxOutputResponse, but that would require more
1174          * than one credit. Windows typically sets this smaller, but for some
1175          * ioctls it may be useful to allow server to send more. No point
1176          * limiting what the server can send as long as fits in one credit
1177          */
1178         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1179
1180         if (is_fsctl)
1181                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1182         else
1183                 req->Flags = 0;
1184
1185         iov[0].iov_base = (char *)req;
1186
1187         /*
1188          * If no input data, the size of ioctl struct in
1189          * protocol spec still includes a 1 byte data buffer,
1190          * but if input data passed to ioctl, we do not
1191          * want to double count this, so we do not send
1192          * the dummy one byte of data in iovec[0] if sending
1193          * input data (in iovec[1]). We also must add 4 bytes
1194          * in first iovec to allow for rfc1002 length field.
1195          */
1196
1197         if (indatalen) {
1198                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1199                 inc_rfc1001_len(req, indatalen - 1);
1200         } else
1201                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1202
1203
1204         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1205         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1206
1207         if (rc != 0) {
1208                 if (tcon)
1209                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1210                 goto ioctl_exit;
1211         }
1212
1213         /* check if caller wants to look at return data or just return rc */
1214         if ((plen == NULL) || (out_data == NULL))
1215                 goto ioctl_exit;
1216
1217         *plen = le32_to_cpu(rsp->OutputCount);
1218
1219         /* We check for obvious errors in the output buffer length and offset */
1220         if (*plen == 0)
1221                 goto ioctl_exit; /* server returned no data */
1222         else if (*plen > 0xFF00) {
1223                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1224                 *plen = 0;
1225                 rc = -EIO;
1226                 goto ioctl_exit;
1227         }
1228
1229         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1230                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1231                         le32_to_cpu(rsp->OutputOffset));
1232                 *plen = 0;
1233                 rc = -EIO;
1234                 goto ioctl_exit;
1235         }
1236
1237         *out_data = kmalloc(*plen, GFP_KERNEL);
1238         if (*out_data == NULL) {
1239                 rc = -ENOMEM;
1240                 goto ioctl_exit;
1241         }
1242
1243         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1244                *plen);
1245 ioctl_exit:
1246         free_rsp_buf(resp_buftype, rsp);
1247         return rc;
1248 }
1249
1250 /*
1251  *   Individual callers to ioctl worker function follow
1252  */
1253
1254 int
1255 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1256                      u64 persistent_fid, u64 volatile_fid)
1257 {
1258         int rc;
1259         char *res_key = NULL;
1260         struct  compress_ioctl fsctl_input;
1261         char *ret_data = NULL;
1262
1263         fsctl_input.CompressionState =
1264                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1265
1266         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1267                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1268                         (char *)&fsctl_input /* data input */,
1269                         2 /* in data len */, &ret_data /* out data */, NULL);
1270
1271         cifs_dbg(FYI, "set compression rc %d\n", rc);
1272         kfree(res_key);
1273
1274         return rc;
1275 }
1276
1277 int
1278 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1279            u64 persistent_fid, u64 volatile_fid)
1280 {
1281         struct smb2_close_req *req;
1282         struct smb2_close_rsp *rsp;
1283         struct TCP_Server_Info *server;
1284         struct cifs_ses *ses = tcon->ses;
1285         struct kvec iov[1];
1286         int resp_buftype;
1287         int rc = 0;
1288
1289         cifs_dbg(FYI, "Close\n");
1290
1291         if (ses && (ses->server))
1292                 server = ses->server;
1293         else
1294                 return -EIO;
1295
1296         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1297         if (rc)
1298                 return rc;
1299
1300         req->PersistentFileId = persistent_fid;
1301         req->VolatileFileId = volatile_fid;
1302
1303         iov[0].iov_base = (char *)req;
1304         /* 4 for rfc1002 length field */
1305         iov[0].iov_len = get_rfc1002_length(req) + 4;
1306
1307         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1308         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1309
1310         if (rc != 0) {
1311                 if (tcon)
1312                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1313                 goto close_exit;
1314         }
1315
1316         /* BB FIXME - decode close response, update inode for caching */
1317
1318 close_exit:
1319         free_rsp_buf(resp_buftype, rsp);
1320         return rc;
1321 }
1322
1323 static int
1324 validate_buf(unsigned int offset, unsigned int buffer_length,
1325              struct smb2_hdr *hdr, unsigned int min_buf_size)
1326
1327 {
1328         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1329         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1330         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1331         char *end_of_buf = begin_of_buf + buffer_length;
1332
1333
1334         if (buffer_length < min_buf_size) {
1335                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1336                          buffer_length, min_buf_size);
1337                 return -EINVAL;
1338         }
1339
1340         /* check if beyond RFC1001 maximum length */
1341         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1342                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1343                          buffer_length, smb_len);
1344                 return -EINVAL;
1345         }
1346
1347         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1348                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1349                 return -EINVAL;
1350         }
1351
1352         return 0;
1353 }
1354
1355 /*
1356  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1357  * Caller must free buffer.
1358  */
1359 static int
1360 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1361                       struct smb2_hdr *hdr, unsigned int minbufsize,
1362                       char *data)
1363
1364 {
1365         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1366         int rc;
1367
1368         if (!data)
1369                 return -EINVAL;
1370
1371         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1372         if (rc)
1373                 return rc;
1374
1375         memcpy(data, begin_of_buf, buffer_length);
1376
1377         return 0;
1378 }
1379
1380 static int
1381 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1382            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1383            size_t output_len, size_t min_len, void *data)
1384 {
1385         struct smb2_query_info_req *req;
1386         struct smb2_query_info_rsp *rsp = NULL;
1387         struct kvec iov[2];
1388         int rc = 0;
1389         int resp_buftype;
1390         struct TCP_Server_Info *server;
1391         struct cifs_ses *ses = tcon->ses;
1392
1393         cifs_dbg(FYI, "Query Info\n");
1394
1395         if (ses && (ses->server))
1396                 server = ses->server;
1397         else
1398                 return -EIO;
1399
1400         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1401         if (rc)
1402                 return rc;
1403
1404         req->InfoType = SMB2_O_INFO_FILE;
1405         req->FileInfoClass = info_class;
1406         req->PersistentFileId = persistent_fid;
1407         req->VolatileFileId = volatile_fid;
1408         /* 4 for rfc1002 length field and 1 for Buffer */
1409         req->InputBufferOffset =
1410                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1411         req->OutputBufferLength = cpu_to_le32(output_len);
1412
1413         iov[0].iov_base = (char *)req;
1414         /* 4 for rfc1002 length field */
1415         iov[0].iov_len = get_rfc1002_length(req) + 4;
1416
1417         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1418         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1419
1420         if (rc) {
1421                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1422                 goto qinf_exit;
1423         }
1424
1425         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1426                                    le32_to_cpu(rsp->OutputBufferLength),
1427                                    &rsp->hdr, min_len, data);
1428
1429 qinf_exit:
1430         free_rsp_buf(resp_buftype, rsp);
1431         return rc;
1432 }
1433
1434 int
1435 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1436                 u64 persistent_fid, u64 volatile_fid,
1437                 struct smb2_file_all_info *data)
1438 {
1439         return query_info(xid, tcon, persistent_fid, volatile_fid,
1440                           FILE_ALL_INFORMATION,
1441                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1442                           sizeof(struct smb2_file_all_info), data);
1443 }
1444
1445 int
1446 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1447                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1448 {
1449         return query_info(xid, tcon, persistent_fid, volatile_fid,
1450                           FILE_INTERNAL_INFORMATION,
1451                           sizeof(struct smb2_file_internal_info),
1452                           sizeof(struct smb2_file_internal_info), uniqueid);
1453 }
1454
1455 /*
1456  * This is a no-op for now. We're not really interested in the reply, but
1457  * rather in the fact that the server sent one and that server->lstrp
1458  * gets updated.
1459  *
1460  * FIXME: maybe we should consider checking that the reply matches request?
1461  */
1462 static void
1463 smb2_echo_callback(struct mid_q_entry *mid)
1464 {
1465         struct TCP_Server_Info *server = mid->callback_data;
1466         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1467         unsigned int credits_received = 1;
1468
1469         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1470                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1471
1472         DeleteMidQEntry(mid);
1473         add_credits(server, credits_received, CIFS_ECHO_OP);
1474 }
1475
1476 int
1477 SMB2_echo(struct TCP_Server_Info *server)
1478 {
1479         struct smb2_echo_req *req;
1480         int rc = 0;
1481         struct kvec iov;
1482         struct smb_rqst rqst = { .rq_iov = &iov,
1483                                  .rq_nvec = 1 };
1484
1485         cifs_dbg(FYI, "In echo request\n");
1486
1487         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1488         if (rc)
1489                 return rc;
1490
1491         req->hdr.CreditRequest = cpu_to_le16(1);
1492
1493         iov.iov_base = (char *)req;
1494         /* 4 for rfc1002 length field */
1495         iov.iov_len = get_rfc1002_length(req) + 4;
1496
1497         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1498                              CIFS_ECHO_OP);
1499         if (rc)
1500                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1501
1502         cifs_small_buf_release(req);
1503         return rc;
1504 }
1505
1506 int
1507 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1508            u64 volatile_fid)
1509 {
1510         struct smb2_flush_req *req;
1511         struct TCP_Server_Info *server;
1512         struct cifs_ses *ses = tcon->ses;
1513         struct kvec iov[1];
1514         int resp_buftype;
1515         int rc = 0;
1516
1517         cifs_dbg(FYI, "Flush\n");
1518
1519         if (ses && (ses->server))
1520                 server = ses->server;
1521         else
1522                 return -EIO;
1523
1524         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1525         if (rc)
1526                 return rc;
1527
1528         req->PersistentFileId = persistent_fid;
1529         req->VolatileFileId = volatile_fid;
1530
1531         iov[0].iov_base = (char *)req;
1532         /* 4 for rfc1002 length field */
1533         iov[0].iov_len = get_rfc1002_length(req) + 4;
1534
1535         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1536
1537         if ((rc != 0) && tcon)
1538                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1539
1540         free_rsp_buf(resp_buftype, iov[0].iov_base);
1541         return rc;
1542 }
1543
1544 /*
1545  * To form a chain of read requests, any read requests after the first should
1546  * have the end_of_chain boolean set to true.
1547  */
1548 static int
1549 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1550                   unsigned int remaining_bytes, int request_type)
1551 {
1552         int rc = -EACCES;
1553         struct smb2_read_req *req = NULL;
1554
1555         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1556         if (rc)
1557                 return rc;
1558         if (io_parms->tcon->ses->server == NULL)
1559                 return -ECONNABORTED;
1560
1561         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1562
1563         req->PersistentFileId = io_parms->persistent_fid;
1564         req->VolatileFileId = io_parms->volatile_fid;
1565         req->ReadChannelInfoOffset = 0; /* reserved */
1566         req->ReadChannelInfoLength = 0; /* reserved */
1567         req->Channel = 0; /* reserved */
1568         req->MinimumCount = 0;
1569         req->Length = cpu_to_le32(io_parms->length);
1570         req->Offset = cpu_to_le64(io_parms->offset);
1571
1572         if (request_type & CHAINED_REQUEST) {
1573                 if (!(request_type & END_OF_CHAIN)) {
1574                         /* 4 for rfc1002 length field */
1575                         req->hdr.NextCommand =
1576                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1577                 } else /* END_OF_CHAIN */
1578                         req->hdr.NextCommand = 0;
1579                 if (request_type & RELATED_REQUEST) {
1580                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1581                         /*
1582                          * Related requests use info from previous read request
1583                          * in chain.
1584                          */
1585                         req->hdr.SessionId = 0xFFFFFFFF;
1586                         req->hdr.TreeId = 0xFFFFFFFF;
1587                         req->PersistentFileId = 0xFFFFFFFF;
1588                         req->VolatileFileId = 0xFFFFFFFF;
1589                 }
1590         }
1591         if (remaining_bytes > io_parms->length)
1592                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1593         else
1594                 req->RemainingBytes = 0;
1595
1596         iov[0].iov_base = (char *)req;
1597         /* 4 for rfc1002 length field */
1598         iov[0].iov_len = get_rfc1002_length(req) + 4;
1599         return rc;
1600 }
1601
1602 static void
1603 smb2_readv_callback(struct mid_q_entry *mid)
1604 {
1605         struct cifs_readdata *rdata = mid->callback_data;
1606         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1607         struct TCP_Server_Info *server = tcon->ses->server;
1608         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1609         unsigned int credits_received = 1;
1610         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1611                                  .rq_nvec = 1,
1612                                  .rq_pages = rdata->pages,
1613                                  .rq_npages = rdata->nr_pages,
1614                                  .rq_pagesz = rdata->pagesz,
1615                                  .rq_tailsz = rdata->tailsz };
1616
1617         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1618                  __func__, mid->mid, mid->mid_state, rdata->result,
1619                  rdata->bytes);
1620
1621         switch (mid->mid_state) {
1622         case MID_RESPONSE_RECEIVED:
1623                 credits_received = le16_to_cpu(buf->CreditRequest);
1624                 /* result already set, check signature */
1625                 if (server->sign) {
1626                         int rc;
1627
1628                         rc = smb2_verify_signature(&rqst, server);
1629                         if (rc)
1630                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1631                                          rc);
1632                 }
1633                 /* FIXME: should this be counted toward the initiating task? */
1634                 task_io_account_read(rdata->bytes);
1635                 cifs_stats_bytes_read(tcon, rdata->bytes);
1636                 break;
1637         case MID_REQUEST_SUBMITTED:
1638         case MID_RETRY_NEEDED:
1639                 rdata->result = -EAGAIN;
1640                 break;
1641         default:
1642                 if (rdata->result != -ENODATA)
1643                         rdata->result = -EIO;
1644         }
1645
1646         if (rdata->result)
1647                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1648
1649         queue_work(cifsiod_wq, &rdata->work);
1650         DeleteMidQEntry(mid);
1651         add_credits(server, credits_received, 0);
1652 }
1653
1654 /* smb2_async_readv - send an async write, and set up mid to handle result */
1655 int
1656 smb2_async_readv(struct cifs_readdata *rdata)
1657 {
1658         int rc;
1659         struct smb2_hdr *buf;
1660         struct cifs_io_parms io_parms;
1661         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1662                                  .rq_nvec = 1 };
1663
1664         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1665                  __func__, rdata->offset, rdata->bytes);
1666
1667         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1668         io_parms.offset = rdata->offset;
1669         io_parms.length = rdata->bytes;
1670         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1671         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1672         io_parms.pid = rdata->pid;
1673         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1674         if (rc)
1675                 return rc;
1676
1677         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1678         /* 4 for rfc1002 length field */
1679         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1680
1681         kref_get(&rdata->refcount);
1682         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1683                              cifs_readv_receive, smb2_readv_callback,
1684                              rdata, 0);
1685         if (rc) {
1686                 kref_put(&rdata->refcount, cifs_readdata_release);
1687                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1688         }
1689
1690         cifs_small_buf_release(buf);
1691         return rc;
1692 }
1693
1694 int
1695 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1696           unsigned int *nbytes, char **buf, int *buf_type)
1697 {
1698         int resp_buftype, rc = -EACCES;
1699         struct smb2_read_rsp *rsp = NULL;
1700         struct kvec iov[1];
1701
1702         *nbytes = 0;
1703         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1704         if (rc)
1705                 return rc;
1706
1707         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1708                           &resp_buftype, CIFS_LOG_ERROR);
1709
1710         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1711
1712         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1713                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1714                 return 0;
1715         }
1716
1717         if (rc) {
1718                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1719                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1720         } else {
1721                 *nbytes = le32_to_cpu(rsp->DataLength);
1722                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1723                     (*nbytes > io_parms->length)) {
1724                         cifs_dbg(FYI, "bad length %d for count %d\n",
1725                                  *nbytes, io_parms->length);
1726                         rc = -EIO;
1727                         *nbytes = 0;
1728                 }
1729         }
1730
1731         if (*buf) {
1732                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1733                        *nbytes);
1734                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1735         } else if (resp_buftype != CIFS_NO_BUFFER) {
1736                 *buf = iov[0].iov_base;
1737                 if (resp_buftype == CIFS_SMALL_BUFFER)
1738                         *buf_type = CIFS_SMALL_BUFFER;
1739                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1740                         *buf_type = CIFS_LARGE_BUFFER;
1741         }
1742         return rc;
1743 }
1744
1745 /*
1746  * Check the mid_state and signature on received buffer (if any), and queue the
1747  * workqueue completion task.
1748  */
1749 static void
1750 smb2_writev_callback(struct mid_q_entry *mid)
1751 {
1752         struct cifs_writedata *wdata = mid->callback_data;
1753         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1754         unsigned int written;
1755         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1756         unsigned int credits_received = 1;
1757
1758         switch (mid->mid_state) {
1759         case MID_RESPONSE_RECEIVED:
1760                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1761                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1762                 if (wdata->result != 0)
1763                         break;
1764
1765                 written = le32_to_cpu(rsp->DataLength);
1766                 /*
1767                  * Mask off high 16 bits when bytes written as returned
1768                  * by the server is greater than bytes requested by the
1769                  * client. OS/2 servers are known to set incorrect
1770                  * CountHigh values.
1771                  */
1772                 if (written > wdata->bytes)
1773                         written &= 0xFFFF;
1774
1775                 if (written < wdata->bytes)
1776                         wdata->result = -ENOSPC;
1777                 else
1778                         wdata->bytes = written;
1779                 break;
1780         case MID_REQUEST_SUBMITTED:
1781         case MID_RETRY_NEEDED:
1782                 wdata->result = -EAGAIN;
1783                 break;
1784         default:
1785                 wdata->result = -EIO;
1786                 break;
1787         }
1788
1789         if (wdata->result)
1790                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1791
1792         queue_work(cifsiod_wq, &wdata->work);
1793         DeleteMidQEntry(mid);
1794         add_credits(tcon->ses->server, credits_received, 0);
1795 }
1796
1797 /* smb2_async_writev - send an async write, and set up mid to handle result */
1798 int
1799 smb2_async_writev(struct cifs_writedata *wdata)
1800 {
1801         int rc = -EACCES;
1802         struct smb2_write_req *req = NULL;
1803         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1804         struct kvec iov;
1805         struct smb_rqst rqst;
1806
1807         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1808         if (rc)
1809                 goto async_writev_out;
1810
1811         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1812
1813         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1814         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1815         req->WriteChannelInfoOffset = 0;
1816         req->WriteChannelInfoLength = 0;
1817         req->Channel = 0;
1818         req->Offset = cpu_to_le64(wdata->offset);
1819         /* 4 for rfc1002 length field */
1820         req->DataOffset = cpu_to_le16(
1821                                 offsetof(struct smb2_write_req, Buffer) - 4);
1822         req->RemainingBytes = 0;
1823
1824         /* 4 for rfc1002 length field and 1 for Buffer */
1825         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1826         iov.iov_base = req;
1827
1828         rqst.rq_iov = &iov;
1829         rqst.rq_nvec = 1;
1830         rqst.rq_pages = wdata->pages;
1831         rqst.rq_npages = wdata->nr_pages;
1832         rqst.rq_pagesz = wdata->pagesz;
1833         rqst.rq_tailsz = wdata->tailsz;
1834
1835         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1836                  wdata->offset, wdata->bytes);
1837
1838         req->Length = cpu_to_le32(wdata->bytes);
1839
1840         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1841
1842         kref_get(&wdata->refcount);
1843         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1844                                 smb2_writev_callback, wdata, 0);
1845
1846         if (rc) {
1847                 kref_put(&wdata->refcount, cifs_writedata_release);
1848                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1849         }
1850
1851 async_writev_out:
1852         cifs_small_buf_release(req);
1853         return rc;
1854 }
1855
1856 /*
1857  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1858  * The length field from io_parms must be at least 1 and indicates a number of
1859  * elements with data to write that begins with position 1 in iov array. All
1860  * data length is specified by count.
1861  */
1862 int
1863 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1864            unsigned int *nbytes, struct kvec *iov, int n_vec)
1865 {
1866         int rc = 0;
1867         struct smb2_write_req *req = NULL;
1868         struct smb2_write_rsp *rsp = NULL;
1869         int resp_buftype;
1870         *nbytes = 0;
1871
1872         if (n_vec < 1)
1873                 return rc;
1874
1875         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1876         if (rc)
1877                 return rc;
1878
1879         if (io_parms->tcon->ses->server == NULL)
1880                 return -ECONNABORTED;
1881
1882         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1883
1884         req->PersistentFileId = io_parms->persistent_fid;
1885         req->VolatileFileId = io_parms->volatile_fid;
1886         req->WriteChannelInfoOffset = 0;
1887         req->WriteChannelInfoLength = 0;
1888         req->Channel = 0;
1889         req->Length = cpu_to_le32(io_parms->length);
1890         req->Offset = cpu_to_le64(io_parms->offset);
1891         /* 4 for rfc1002 length field */
1892         req->DataOffset = cpu_to_le16(
1893                                 offsetof(struct smb2_write_req, Buffer) - 4);
1894         req->RemainingBytes = 0;
1895
1896         iov[0].iov_base = (char *)req;
1897         /* 4 for rfc1002 length field and 1 for Buffer */
1898         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1899
1900         /* length of entire message including data to be written */
1901         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1902
1903         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1904                           &resp_buftype, 0);
1905         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1906
1907         if (rc) {
1908                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1909                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1910         } else
1911                 *nbytes = le32_to_cpu(rsp->DataLength);
1912
1913         free_rsp_buf(resp_buftype, rsp);
1914         return rc;
1915 }
1916
1917 static unsigned int
1918 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1919 {
1920         int len;
1921         unsigned int entrycount = 0;
1922         unsigned int next_offset = 0;
1923         FILE_DIRECTORY_INFO *entryptr;
1924
1925         if (bufstart == NULL)
1926                 return 0;
1927
1928         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1929
1930         while (1) {
1931                 entryptr = (FILE_DIRECTORY_INFO *)
1932                                         ((char *)entryptr + next_offset);
1933
1934                 if ((char *)entryptr + size > end_of_buf) {
1935                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1936                         break;
1937                 }
1938
1939                 len = le32_to_cpu(entryptr->FileNameLength);
1940                 if ((char *)entryptr + len + size > end_of_buf) {
1941                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1942                                  end_of_buf);
1943                         break;
1944                 }
1945
1946                 *lastentry = (char *)entryptr;
1947                 entrycount++;
1948
1949                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1950                 if (!next_offset)
1951                         break;
1952         }
1953
1954         return entrycount;
1955 }
1956
1957 /*
1958  * Readdir/FindFirst
1959  */
1960 int
1961 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1962                      u64 persistent_fid, u64 volatile_fid, int index,
1963                      struct cifs_search_info *srch_inf)
1964 {
1965         struct smb2_query_directory_req *req;
1966         struct smb2_query_directory_rsp *rsp = NULL;
1967         struct kvec iov[2];
1968         int rc = 0;
1969         int len;
1970         int resp_buftype;
1971         unsigned char *bufptr;
1972         struct TCP_Server_Info *server;
1973         struct cifs_ses *ses = tcon->ses;
1974         __le16 asteriks = cpu_to_le16('*');
1975         char *end_of_smb;
1976         unsigned int output_size = CIFSMaxBufSize;
1977         size_t info_buf_size;
1978
1979         if (ses && (ses->server))
1980                 server = ses->server;
1981         else
1982                 return -EIO;
1983
1984         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1985         if (rc)
1986                 return rc;
1987
1988         switch (srch_inf->info_level) {
1989         case SMB_FIND_FILE_DIRECTORY_INFO:
1990                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1991                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1992                 break;
1993         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1994                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1995                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1996                 break;
1997         default:
1998                 cifs_dbg(VFS, "info level %u isn't supported\n",
1999                          srch_inf->info_level);
2000                 rc = -EINVAL;
2001                 goto qdir_exit;
2002         }
2003
2004         req->FileIndex = cpu_to_le32(index);
2005         req->PersistentFileId = persistent_fid;
2006         req->VolatileFileId = volatile_fid;
2007
2008         len = 0x2;
2009         bufptr = req->Buffer;
2010         memcpy(bufptr, &asteriks, len);
2011
2012         req->FileNameOffset =
2013                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2014         req->FileNameLength = cpu_to_le16(len);
2015         /*
2016          * BB could be 30 bytes or so longer if we used SMB2 specific
2017          * buffer lengths, but this is safe and close enough.
2018          */
2019         output_size = min_t(unsigned int, output_size, server->maxBuf);
2020         output_size = min_t(unsigned int, output_size, 2 << 15);
2021         req->OutputBufferLength = cpu_to_le32(output_size);
2022
2023         iov[0].iov_base = (char *)req;
2024         /* 4 for RFC1001 length and 1 for Buffer */
2025         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2026
2027         iov[1].iov_base = (char *)(req->Buffer);
2028         iov[1].iov_len = len;
2029
2030         inc_rfc1001_len(req, len - 1 /* Buffer */);
2031
2032         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2033         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2034
2035         if (rc) {
2036                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2037                 goto qdir_exit;
2038         }
2039
2040         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2041                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2042                           info_buf_size);
2043         if (rc)
2044                 goto qdir_exit;
2045
2046         srch_inf->unicode = true;
2047
2048         if (srch_inf->ntwrk_buf_start) {
2049                 if (srch_inf->smallBuf)
2050                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2051                 else
2052                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2053         }
2054         srch_inf->ntwrk_buf_start = (char *)rsp;
2055         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2056                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2057         /* 4 for rfc1002 length field */
2058         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2059         srch_inf->entries_in_buffer =
2060                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2061                                     &srch_inf->last_entry, info_buf_size);
2062         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2063         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2064                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2065                  srch_inf->srch_entries_start, srch_inf->last_entry);
2066         if (resp_buftype == CIFS_LARGE_BUFFER)
2067                 srch_inf->smallBuf = false;
2068         else if (resp_buftype == CIFS_SMALL_BUFFER)
2069                 srch_inf->smallBuf = true;
2070         else
2071                 cifs_dbg(VFS, "illegal search buffer type\n");
2072
2073         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2074                 srch_inf->endOfSearch = 1;
2075         else
2076                 srch_inf->endOfSearch = 0;
2077
2078         return rc;
2079
2080 qdir_exit:
2081         free_rsp_buf(resp_buftype, rsp);
2082         return rc;
2083 }
2084
2085 static int
2086 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2087                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2088                unsigned int num, void **data, unsigned int *size)
2089 {
2090         struct smb2_set_info_req *req;
2091         struct smb2_set_info_rsp *rsp = NULL;
2092         struct kvec *iov;
2093         int rc = 0;
2094         int resp_buftype;
2095         unsigned int i;
2096         struct TCP_Server_Info *server;
2097         struct cifs_ses *ses = tcon->ses;
2098
2099         if (ses && (ses->server))
2100                 server = ses->server;
2101         else
2102                 return -EIO;
2103
2104         if (!num)
2105                 return -EINVAL;
2106
2107         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2108         if (!iov)
2109                 return -ENOMEM;
2110
2111         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2112         if (rc) {
2113                 kfree(iov);
2114                 return rc;
2115         }
2116
2117         req->hdr.ProcessId = cpu_to_le32(pid);
2118
2119         req->InfoType = SMB2_O_INFO_FILE;
2120         req->FileInfoClass = info_class;
2121         req->PersistentFileId = persistent_fid;
2122         req->VolatileFileId = volatile_fid;
2123
2124         /* 4 for RFC1001 length and 1 for Buffer */
2125         req->BufferOffset =
2126                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2127         req->BufferLength = cpu_to_le32(*size);
2128
2129         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2130
2131         memcpy(req->Buffer, *data, *size);
2132
2133         iov[0].iov_base = (char *)req;
2134         /* 4 for RFC1001 length */
2135         iov[0].iov_len = get_rfc1002_length(req) + 4;
2136
2137         for (i = 1; i < num; i++) {
2138                 inc_rfc1001_len(req, size[i]);
2139                 le32_add_cpu(&req->BufferLength, size[i]);
2140                 iov[i].iov_base = (char *)data[i];
2141                 iov[i].iov_len = size[i];
2142         }
2143
2144         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2145         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2146
2147         if (rc != 0) {
2148                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2149                 goto out;
2150         }
2151 out:
2152         free_rsp_buf(resp_buftype, rsp);
2153         kfree(iov);
2154         return rc;
2155 }
2156
2157 int
2158 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2159             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2160 {
2161         struct smb2_file_rename_info info;
2162         void **data;
2163         unsigned int size[2];
2164         int rc;
2165         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2166
2167         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2168         if (!data)
2169                 return -ENOMEM;
2170
2171         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2172                               /* 0 = fail if target already exists */
2173         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2174         info.FileNameLength = cpu_to_le32(len);
2175
2176         data[0] = &info;
2177         size[0] = sizeof(struct smb2_file_rename_info);
2178
2179         data[1] = target_file;
2180         size[1] = len + 2 /* null */;
2181
2182         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2183                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2184                            size);
2185         kfree(data);
2186         return rc;
2187 }
2188
2189 int
2190 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2191                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2192 {
2193         struct smb2_file_link_info info;
2194         void **data;
2195         unsigned int size[2];
2196         int rc;
2197         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2198
2199         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2200         if (!data)
2201                 return -ENOMEM;
2202
2203         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2204                               /* 0 = fail if link already exists */
2205         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2206         info.FileNameLength = cpu_to_le32(len);
2207
2208         data[0] = &info;
2209         size[0] = sizeof(struct smb2_file_link_info);
2210
2211         data[1] = target_file;
2212         size[1] = len + 2 /* null */;
2213
2214         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2215                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2216         kfree(data);
2217         return rc;
2218 }
2219
2220 int
2221 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2222              u64 volatile_fid, u32 pid, __le64 *eof)
2223 {
2224         struct smb2_file_eof_info info;
2225         void *data;
2226         unsigned int size;
2227
2228         info.EndOfFile = *eof;
2229
2230         data = &info;
2231         size = sizeof(struct smb2_file_eof_info);
2232
2233         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2234                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2235 }
2236
2237 int
2238 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2239               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2240 {
2241         unsigned int size;
2242         size = sizeof(FILE_BASIC_INFO);
2243         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2244                              current->tgid, FILE_BASIC_INFORMATION, 1,
2245                              (void **)&buf, &size);
2246 }
2247
2248 int
2249 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2250                   const u64 persistent_fid, const u64 volatile_fid,
2251                   __u8 oplock_level)
2252 {
2253         int rc;
2254         struct smb2_oplock_break *req = NULL;
2255
2256         cifs_dbg(FYI, "SMB2_oplock_break\n");
2257         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2258
2259         if (rc)
2260                 return rc;
2261
2262         req->VolatileFid = volatile_fid;
2263         req->PersistentFid = persistent_fid;
2264         req->OplockLevel = oplock_level;
2265         req->hdr.CreditRequest = cpu_to_le16(1);
2266
2267         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2268         /* SMB2 buffer freed by function above */
2269
2270         if (rc) {
2271                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2272                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2273         }
2274
2275         return rc;
2276 }
2277
2278 static void
2279 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2280                         struct kstatfs *kst)
2281 {
2282         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2283                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2284         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2285         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2286         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2287         return;
2288 }
2289
2290 static int
2291 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2292                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2293 {
2294         int rc;
2295         struct smb2_query_info_req *req;
2296
2297         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2298
2299         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2300                 return -EIO;
2301
2302         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2303         if (rc)
2304                 return rc;
2305
2306         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2307         req->FileInfoClass = level;
2308         req->PersistentFileId = persistent_fid;
2309         req->VolatileFileId = volatile_fid;
2310         /* 4 for rfc1002 length field and 1 for pad */
2311         req->InputBufferOffset =
2312                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2313         req->OutputBufferLength = cpu_to_le32(
2314                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2315
2316         iov->iov_base = (char *)req;
2317         /* 4 for rfc1002 length field */
2318         iov->iov_len = get_rfc1002_length(req) + 4;
2319         return 0;
2320 }
2321
2322 int
2323 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2324               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2325 {
2326         struct smb2_query_info_rsp *rsp = NULL;
2327         struct kvec iov;
2328         int rc = 0;
2329         int resp_buftype;
2330         struct cifs_ses *ses = tcon->ses;
2331         struct smb2_fs_full_size_info *info = NULL;
2332
2333         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2334                                 sizeof(struct smb2_fs_full_size_info),
2335                                 persistent_fid, volatile_fid);
2336         if (rc)
2337                 return rc;
2338
2339         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2340         if (rc) {
2341                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2342                 goto qfsinf_exit;
2343         }
2344         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2345
2346         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2347                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2348         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2349                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2350                           sizeof(struct smb2_fs_full_size_info));
2351         if (!rc)
2352                 copy_fs_info_to_kstatfs(info, fsdata);
2353
2354 qfsinf_exit:
2355         free_rsp_buf(resp_buftype, iov.iov_base);
2356         return rc;
2357 }
2358
2359 int
2360 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2361               u64 persistent_fid, u64 volatile_fid, int level)
2362 {
2363         struct smb2_query_info_rsp *rsp = NULL;
2364         struct kvec iov;
2365         int rc = 0;
2366         int resp_buftype, max_len, min_len;
2367         struct cifs_ses *ses = tcon->ses;
2368         unsigned int rsp_len, offset;
2369
2370         if (level == FS_DEVICE_INFORMATION) {
2371                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2372                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2373         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2374                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2375                 min_len = MIN_FS_ATTR_INFO_SIZE;
2376         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2377                 max_len = sizeof(struct smb3_fs_ss_info);
2378                 min_len = sizeof(struct smb3_fs_ss_info);
2379         } else {
2380                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2381                 return -EINVAL;
2382         }
2383
2384         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2385                                 persistent_fid, volatile_fid);
2386         if (rc)
2387                 return rc;
2388
2389         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2390         if (rc) {
2391                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2392                 goto qfsattr_exit;
2393         }
2394         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2395
2396         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2397         offset = le16_to_cpu(rsp->OutputBufferOffset);
2398         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2399         if (rc)
2400                 goto qfsattr_exit;
2401
2402         if (level == FS_ATTRIBUTE_INFORMATION)
2403                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2404                         + (char *)&rsp->hdr, min_t(unsigned int,
2405                         rsp_len, max_len));
2406         else if (level == FS_DEVICE_INFORMATION)
2407                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2408                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2409         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2410                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2411                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2412                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2413                 tcon->perf_sector_size =
2414                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2415         }
2416
2417 qfsattr_exit:
2418         free_rsp_buf(resp_buftype, iov.iov_base);
2419         return rc;
2420 }
2421
2422 int
2423 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2424            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2425            const __u32 num_lock, struct smb2_lock_element *buf)
2426 {
2427         int rc = 0;
2428         struct smb2_lock_req *req = NULL;
2429         struct kvec iov[2];
2430         int resp_buf_type;
2431         unsigned int count;
2432
2433         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2434
2435         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2436         if (rc)
2437                 return rc;
2438
2439         req->hdr.ProcessId = cpu_to_le32(pid);
2440         req->LockCount = cpu_to_le16(num_lock);
2441
2442         req->PersistentFileId = persist_fid;
2443         req->VolatileFileId = volatile_fid;
2444
2445         count = num_lock * sizeof(struct smb2_lock_element);
2446         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2447
2448         iov[0].iov_base = (char *)req;
2449         /* 4 for rfc1002 length field and count for all locks */
2450         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2451         iov[1].iov_base = (char *)buf;
2452         iov[1].iov_len = count;
2453
2454         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2455         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2456         if (rc) {
2457                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2458                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2459         }
2460
2461         return rc;
2462 }
2463
2464 int
2465 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2466           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2467           const __u64 length, const __u64 offset, const __u32 lock_flags,
2468           const bool wait)
2469 {
2470         struct smb2_lock_element lock;
2471
2472         lock.Offset = cpu_to_le64(offset);
2473         lock.Length = cpu_to_le64(length);
2474         lock.Flags = cpu_to_le32(lock_flags);
2475         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2476                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2477
2478         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2479 }
2480
2481 int
2482 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2483                  __u8 *lease_key, const __le32 lease_state)
2484 {
2485         int rc;
2486         struct smb2_lease_ack *req = NULL;
2487
2488         cifs_dbg(FYI, "SMB2_lease_break\n");
2489         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2490
2491         if (rc)
2492                 return rc;
2493
2494         req->hdr.CreditRequest = cpu_to_le16(1);
2495         req->StructureSize = cpu_to_le16(36);
2496         inc_rfc1001_len(req, 12);
2497
2498         memcpy(req->LeaseKey, lease_key, 16);
2499         req->LeaseState = lease_state;
2500
2501         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2502         /* SMB2 buffer freed by function above */
2503
2504         if (rc) {
2505                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2506                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2507         }
2508
2509         return rc;
2510 }