Pileus Git - ~andy/linux/blob - fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server = ses->server;
 468         u16 blob_length = 0;
 469         char *security_blob;
 470         char *ntlmssp_blob = NULL;
 471         bool use_spnego = false; /* else use raw ntlmssp */
 472
 473         cifs_dbg(FYI, "Session Setup\n");
 474
 475         if (!server) {
 476                 WARN(1, "%s: server is NULL!\n", __func__);
 477                 return -EIO;
 478         }
 479
 480         /*
 481          * If we are here due to reconnect, free per-smb session key
 482          * in case signing was required.
 483          */
 484         kfree(ses->auth_key.response);
 485         ses->auth_key.response = NULL;
 486
 487         /*
 488          * If memory allocation is successful, caller of this function
 489          * frees it.
 490          */
 491         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 492         if (!ses->ntlmssp)
 493                 return -ENOMEM;
 494         ses->ntlmssp->sesskey_per_smbsess = true;
 495
 496         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 497         ses->sectype = RawNTLMSSP;
 498
 499 ssetup_ntlmssp_authenticate:
 500         if (phase == NtLmChallenge)
 501                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 502
 503         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 504         if (rc)
 505                 return rc;
 506
 507         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 508         req->VcNumber = 0; /* MBZ */
 509         /* to enable echos and oplocks */
 510         req->hdr.CreditRequest = cpu_to_le16(3);
 511
 512         /* only one of SMB2 signing flags may be set in SMB2 request */
 513         if (server->sign)
 514                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 515         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 516                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 517         else
 518                 req->SecurityMode = 0;
 519
 520         req->Capabilities = 0;
 521         req->Channel = 0; /* MBZ */
 522
 523         iov[0].iov_base = (char *)req;
 524         /* 4 for rfc1002 length field and 1 for pad */
 525         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 526         if (phase == NtLmNegotiate) {
 527                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 528                                        GFP_KERNEL);
 529                 if (ntlmssp_blob == NULL) {
 530                         rc = -ENOMEM;
 531                         goto ssetup_exit;
 532                 }
 533                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 534                 if (use_spnego) {
 535                         /* blob_length = build_spnego_ntlmssp_blob(
 536                                         &security_blob,
 537                                         sizeof(struct _NEGOTIATE_MESSAGE),
 538                                         ntlmssp_blob); */
 539                         /* BB eventually need to add this */
 540                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 541                         rc = -EOPNOTSUPP;
 542                         kfree(ntlmssp_blob);
 543                         goto ssetup_exit;
 544                 } else {
 545                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 546                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 547                         security_blob = ntlmssp_blob;
 548                 }
 549         } else if (phase == NtLmAuthenticate) {
 550                 req->hdr.SessionId = ses->Suid;
 551                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 552                                        GFP_KERNEL);
 553                 if (ntlmssp_blob == NULL) {
 554                         rc = -ENOMEM;
 555                         goto ssetup_exit;
 556                 }
 557                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 558                                              nls_cp);
 559                 if (rc) {
 560                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 561                                  rc);
 562                         goto ssetup_exit; /* BB double check error handling */
 563                 }
 564                 if (use_spnego) {
 565                         /* blob_length = build_spnego_ntlmssp_blob(
 566                                                         &security_blob,
 567                                                         blob_length,
 568                                                         ntlmssp_blob); */
 569                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 570                         rc = -EOPNOTSUPP;
 571                         kfree(ntlmssp_blob);
 572                         goto ssetup_exit;
 573                 } else {
 574                         security_blob = ntlmssp_blob;
 575                 }
 576         } else {
 577                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 578                 rc = -EIO;
 579                 goto ssetup_exit;
 580         }
 581
 582         /* Testing shows that buffer offset must be at location of Buffer[0] */
 583         req->SecurityBufferOffset =
 584                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 585                                             1 /* pad */ - 4 /* rfc1001 len */);
 586         req->SecurityBufferLength = cpu_to_le16(blob_length);
 587         iov[1].iov_base = security_blob;
 588         iov[1].iov_len = blob_length;
 589
 590         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 591
 592         /* BB add code to build os and lm fields */
 593
 594         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 595                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 596
 597         kfree(security_blob);
 598         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 599         if (resp_buftype != CIFS_NO_BUFFER &&
 600             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 601                 if (phase != NtLmNegotiate) {
 602                         cifs_dbg(VFS, "Unexpected more processing error\n");
 603                         goto ssetup_exit;
 604                 }
 605                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 606                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 607                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 608                                  le16_to_cpu(rsp->SecurityBufferOffset));
 609                         rc = -EIO;
 610                         goto ssetup_exit;
 611                 }
 612
 613                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 614                 phase = NtLmChallenge; /* process ntlmssp challenge */
 615                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 616                 ses->Suid = rsp->hdr.SessionId;
 617                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 618                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 619         }
 620
 621         /*
 622          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 623          * but at least the raw NTLMSSP case works.
 624          */
 625         /*
 626          * No tcon so can't do
 627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 628          */
 629         if (rc != 0)
 630                 goto ssetup_exit;
 631
 632         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 633         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 634                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 635 ssetup_exit:
 636         free_rsp_buf(resp_buftype, rsp);
 637
 638         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 639         if ((phase == NtLmChallenge) && (rc == 0))
 640                 goto ssetup_ntlmssp_authenticate;
 641
 642         if (!rc) {
 643                 mutex_lock(&server->srv_mutex);
 644                 if (server->sign && server->ops->generate_signingkey) {
 645                         rc = server->ops->generate_signingkey(ses);
 646                         kfree(ses->auth_key.response);
 647                         ses->auth_key.response = NULL;
 648                         if (rc) {
 649                                 cifs_dbg(FYI,
 650                                         "SMB3 session key generation failed\n");
 651                                 mutex_unlock(&server->srv_mutex);
 652                                 goto keygen_exit;
 653                         }
 654                 }
 655                 if (!server->session_estab) {
 656                         server->sequence_number = 0x2;
 657                         server->session_estab = true;
 658                 }
 659                 mutex_unlock(&server->srv_mutex);
 660
 661                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 662                 spin_lock(&GlobalMid_Lock);
 663                 ses->status = CifsGood;
 664                 ses->need_reconnect = false;
 665                 spin_unlock(&GlobalMid_Lock);
 666         }
 667
 668 keygen_exit:
 669         if (!server->sign) {
 670                 kfree(ses->auth_key.response);
 671                 ses->auth_key.response = NULL;
 672         }
 673         kfree(ses->ntlmssp);
 674
 675         return rc;
 676 }
 677
 678 int
 679 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 680 {
 681         struct smb2_logoff_req *req; /* response is also trivial struct */
 682         int rc = 0;
 683         struct TCP_Server_Info *server;
 684
 685         cifs_dbg(FYI, "disconnect session %p\n", ses);
 686
 687         if (ses && (ses->server))
 688                 server = ses->server;
 689         else
 690                 return -EIO;
 691
 692         /* no need to send SMB logoff if uid already closed due to reconnect */
 693         if (ses->need_reconnect)
 694                 goto smb2_session_already_dead;
 695
 696         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 697         if (rc)
 698                 return rc;
 699
 700          /* since no tcon, smb2_init can not do this, so do here */
 701         req->hdr.SessionId = ses->Suid;
 702         if (server->sign)
 703                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 704
 705         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 706         /*
 707          * No tcon so can't do
 708          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 709          */
 710
 711 smb2_session_already_dead:
 712         return rc;
 713 }
 714
 715 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 716 {
 717         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 718 }
 719
 720 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 721
 722 /* These are similar values to what Windows uses */
 723 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 724 {
 725         tcon->max_chunks = 256;
 726         tcon->max_bytes_chunk = 1048576;
 727         tcon->max_bytes_copy = 16777216;
 728 }
 729
 730 int
 731 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 732           struct cifs_tcon *tcon, const struct nls_table *cp)
 733 {
 734         struct smb2_tree_connect_req *req;
 735         struct smb2_tree_connect_rsp *rsp = NULL;
 736         struct kvec iov[2];
 737         int rc = 0;
 738         int resp_buftype;
 739         int unc_path_len;
 740         struct TCP_Server_Info *server;
 741         __le16 *unc_path = NULL;
 742
 743         cifs_dbg(FYI, "TCON\n");
 744
 745         if ((ses->server) && tree)
 746                 server = ses->server;
 747         else
 748                 return -EIO;
 749
 750         if (tcon && tcon->bad_network_name)
 751                 return -ENOENT;
 752
 753         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 754         if (unc_path == NULL)
 755                 return -ENOMEM;
 756
 757         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 758         unc_path_len *= 2;
 759         if (unc_path_len < 2) {
 760                 kfree(unc_path);
 761                 return -EINVAL;
 762         }
 763
 764         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 765         if (rc) {
 766                 kfree(unc_path);
 767                 return rc;
 768         }
 769
 770         if (tcon == NULL) {
 771                 /* since no tcon, smb2_init can not do this, so do here */
 772                 req->hdr.SessionId = ses->Suid;
 773                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 774                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 775         }
 776
 777         iov[0].iov_base = (char *)req;
 778         /* 4 for rfc1002 length field and 1 for pad */
 779         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 780
 781         /* Testing shows that buffer offset must be at location of Buffer[0] */
 782         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 783                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 784         req->PathLength = cpu_to_le16(unc_path_len - 2);
 785         iov[1].iov_base = unc_path;
 786         iov[1].iov_len = unc_path_len;
 787
 788         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 789
 790         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 791         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 792
 793         if (rc != 0) {
 794                 if (tcon) {
 795                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 796                         tcon->need_reconnect = true;
 797                 }
 798                 goto tcon_error_exit;
 799         }
 800
 801         if (tcon == NULL) {
 802                 ses->ipc_tid = rsp->hdr.TreeId;
 803                 goto tcon_exit;
 804         }
 805
 806         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 807                 cifs_dbg(FYI, "connection to disk share\n");
 808         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 809                 tcon->ipc = true;
 810                 cifs_dbg(FYI, "connection to pipe share\n");
 811         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 812                 tcon->print = true;
 813                 cifs_dbg(FYI, "connection to printer\n");
 814         } else {
 815                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 816                 rc = -EOPNOTSUPP;
 817                 goto tcon_error_exit;
 818         }
 819
 820         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 821         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 822         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 823         tcon->tidStatus = CifsGood;
 824         tcon->need_reconnect = false;
 825         tcon->tid = rsp->hdr.TreeId;
 826         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 827
 828         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 829             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 830                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 831         init_copy_chunk_defaults(tcon);
 832 tcon_exit:
 833         free_rsp_buf(resp_buftype, rsp);
 834         kfree(unc_path);
 835         return rc;
 836
 837 tcon_error_exit:
 838         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 839                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 840                 tcon->bad_network_name = true;
 841         }
 842         goto tcon_exit;
 843 }
 844
 845 int
 846 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 847 {
 848         struct smb2_tree_disconnect_req *req; /* response is trivial */
 849         int rc = 0;
 850         struct TCP_Server_Info *server;
 851         struct cifs_ses *ses = tcon->ses;
 852
 853         cifs_dbg(FYI, "Tree Disconnect\n");
 854
 855         if (ses && (ses->server))
 856                 server = ses->server;
 857         else
 858                 return -EIO;
 859
 860         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 861                 return 0;
 862
 863         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 864         if (rc)
 865                 return rc;
 866
 867         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 868         if (rc)
 869                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 870
 871         return rc;
 872 }
 873
 874
 875 static struct create_durable *
 876 create_durable_buf(void)
 877 {
 878         struct create_durable *buf;
 879
 880         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 881         if (!buf)
 882                 return NULL;
 883
 884         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 885                                         (struct create_durable, Data));
 886         buf->ccontext.DataLength = cpu_to_le32(16);
 887         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 888                                 (struct create_durable, Name));
 889         buf->ccontext.NameLength = cpu_to_le16(4);
 890         buf->Name[0] = 'D';
 891         buf->Name[1] = 'H';
 892         buf->Name[2] = 'n';
 893         buf->Name[3] = 'Q';
 894         return buf;
 895 }
 896
 897 static struct create_durable *
 898 create_reconnect_durable_buf(struct cifs_fid *fid)
 899 {
 900         struct create_durable *buf;
 901
 902         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 903         if (!buf)
 904                 return NULL;
 905
 906         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 907                                         (struct create_durable, Data));
 908         buf->ccontext.DataLength = cpu_to_le32(16);
 909         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 910                                 (struct create_durable, Name));
 911         buf->ccontext.NameLength = cpu_to_le16(4);
 912         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 913         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 914         buf->Name[0] = 'D';
 915         buf->Name[1] = 'H';
 916         buf->Name[2] = 'n';
 917         buf->Name[3] = 'C';
 918         return buf;
 919 }
 920
 921 static __u8
 922 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
 923                   unsigned int *epoch)
 924 {
 925         char *data_offset;
 926         struct create_context *cc;
 927         unsigned int next = 0;
 928         char *name;
 929
 930         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 931         cc = (struct create_context *)data_offset;
 932         do {
 933                 cc = (struct create_context *)((char *)cc + next);
 934                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
 935                 if (le16_to_cpu(cc->NameLength) != 4 ||
 936                     strncmp(name, "RqLs", 4)) {
 937                         next = le32_to_cpu(cc->Next);
 938                         continue;
 939                 }
 940                 return server->ops->parse_lease_buf(cc, epoch);
 941         } while (next != 0);
 942
 943         return 0;
 944 }
 945
 946 static int
 947 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
 948                   unsigned int *num_iovec, __u8 *oplock)
 949 {
 950         struct smb2_create_req *req = iov[0].iov_base;
 951         unsigned int num = *num_iovec;
 952
 953         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
 954         if (iov[num].iov_base == NULL)
 955                 return -ENOMEM;
 956         iov[num].iov_len = server->vals->create_lease_size;
 957         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 958         if (!req->CreateContextsOffset)
 959                 req->CreateContextsOffset = cpu_to_le32(
 960                                 sizeof(struct smb2_create_req) - 4 +
 961                                 iov[num - 1].iov_len);
 962         le32_add_cpu(&req->CreateContextsLength,
 963                      server->vals->create_lease_size);
 964         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
 965         *num_iovec = num + 1;
 966         return 0;
 967 }
 968
 969 static int
 970 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 971                     struct cifs_open_parms *oparms)
 972 {
 973         struct smb2_create_req *req = iov[0].iov_base;
 974         unsigned int num = *num_iovec;
 975
 976         if (oparms->reconnect) {
 977                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 978                 /* indicate that we don't need to relock the file */
 979                 oparms->reconnect = false;
 980         } else
 981                 iov[num].iov_base = create_durable_buf();
 982         if (iov[num].iov_base == NULL)
 983                 return -ENOMEM;
 984         iov[num].iov_len = sizeof(struct create_durable);
 985         if (!req->CreateContextsOffset)
 986                 req->CreateContextsOffset =
 987                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 988                                                                 iov[1].iov_len);
 989         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
 990         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
 991         *num_iovec = num + 1;
 992         return 0;
 993 }
 994
 995 int
 996 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
 997           __u8 *oplock, struct smb2_file_all_info *buf,
 998           struct smb2_err_rsp **err_buf)
 999 {
1000         struct smb2_create_req *req;
1001         struct smb2_create_rsp *rsp;
1002         struct TCP_Server_Info *server;
1003         struct cifs_tcon *tcon = oparms->tcon;
1004         struct cifs_ses *ses = tcon->ses;
1005         struct kvec iov[4];
1006         int resp_buftype;
1007         int uni_path_len;
1008         __le16 *copy_path = NULL;
1009         int copy_size;
1010         int rc = 0;
1011         unsigned int num_iovecs = 2;
1012         __u32 file_attributes = 0;
1013
1014         cifs_dbg(FYI, "create/open\n");
1015
1016         if (ses && (ses->server))
1017                 server = ses->server;
1018         else
1019                 return -EIO;
1020
1021         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1022         if (rc)
1023                 return rc;
1024
1025         if (oparms->create_options & CREATE_OPTION_READONLY)
1026                 file_attributes |= ATTR_READONLY;
1027
1028         req->ImpersonationLevel = IL_IMPERSONATION;
1029         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1030         /* File attributes ignored on open (used in create though) */
1031         req->FileAttributes = cpu_to_le32(file_attributes);
1032         req->ShareAccess = FILE_SHARE_ALL_LE;
1033         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1034         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1035         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1036         /* do not count rfc1001 len field */
1037         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1038
1039         iov[0].iov_base = (char *)req;
1040         /* 4 for rfc1002 length field */
1041         iov[0].iov_len = get_rfc1002_length(req) + 4;
1042
1043         /* MUST set path len (NameLength) to 0 opening root of share */
1044         req->NameLength = cpu_to_le16(uni_path_len - 2);
1045         /* -1 since last byte is buf[0] which is sent below (path) */
1046         iov[0].iov_len--;
1047         if (uni_path_len % 8 != 0) {
1048                 copy_size = uni_path_len / 8 * 8;
1049                 if (copy_size < uni_path_len)
1050                         copy_size += 8;
1051
1052                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1053                 if (!copy_path)
1054                         return -ENOMEM;
1055                 memcpy((char *)copy_path, (const char *)path,
1056                         uni_path_len);
1057                 uni_path_len = copy_size;
1058                 path = copy_path;
1059         }
1060
1061         iov[1].iov_len = uni_path_len;
1062         iov[1].iov_base = path;
1063         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1064         inc_rfc1001_len(req, uni_path_len - 1);
1065
1066         if (!server->oplocks)
1067                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1068
1069         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1070             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1071                 req->RequestedOplockLevel = *oplock;
1072         else {
1073                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1074                 if (rc) {
1075                         cifs_small_buf_release(req);
1076                         kfree(copy_path);
1077                         return rc;
1078                 }
1079         }
1080
1081         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1082                 /* need to set Next field of lease context if we request it */
1083                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1084                         struct create_context *ccontext =
1085                             (struct create_context *)iov[num_iovecs-1].iov_base;
1086                         ccontext->Next =
1087                                 cpu_to_le32(server->vals->create_lease_size);
1088                 }
1089                 rc = add_durable_context(iov, &num_iovecs, oparms);
1090                 if (rc) {
1091                         cifs_small_buf_release(req);
1092                         kfree(copy_path);
1093                         kfree(iov[num_iovecs-1].iov_base);
1094                         return rc;
1095                 }
1096         }
1097
1098         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1099         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1100
1101         if (rc != 0) {
1102                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1103                 if (err_buf)
1104                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1105                                            GFP_KERNEL);
1106                 goto creat_exit;
1107         }
1108
1109         oparms->fid->persistent_fid = rsp->PersistentFileId;
1110         oparms->fid->volatile_fid = rsp->VolatileFileId;
1111
1112         if (buf) {
1113                 memcpy(buf, &rsp->CreationTime, 32);
1114                 buf->AllocationSize = rsp->AllocationSize;
1115                 buf->EndOfFile = rsp->EndofFile;
1116                 buf->Attributes = rsp->FileAttributes;
1117                 buf->NumberOfLinks = cpu_to_le32(1);
1118                 buf->DeletePending = 0;
1119         }
1120
1121         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1122                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1123         else
1124                 *oplock = rsp->OplockLevel;
1125 creat_exit:
1126         kfree(copy_path);
1127         free_rsp_buf(resp_buftype, rsp);
1128         return rc;
1129 }
1130
1131 /*
1132  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1133  */
1134 int
1135 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1136            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1137            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1138 {
1139         struct smb2_ioctl_req *req;
1140         struct smb2_ioctl_rsp *rsp;
1141         struct TCP_Server_Info *server;
1142         struct cifs_ses *ses = tcon->ses;
1143         struct kvec iov[2];
1144         int resp_buftype;
1145         int num_iovecs;
1146         int rc = 0;
1147
1148         cifs_dbg(FYI, "SMB2 IOCTL\n");
1149
1150         *out_data = NULL;
1151         /* zero out returned data len, in case of error */
1152         if (plen)
1153                 *plen = 0;
1154
1155         if (ses && (ses->server))
1156                 server = ses->server;
1157         else
1158                 return -EIO;
1159
1160         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1161         if (rc)
1162                 return rc;
1163
1164         req->CtlCode = cpu_to_le32(opcode);
1165         req->PersistentFileId = persistent_fid;
1166         req->VolatileFileId = volatile_fid;
1167
1168         if (indatalen) {
1169                 req->InputCount = cpu_to_le32(indatalen);
1170                 /* do not set InputOffset if no input data */
1171                 req->InputOffset =
1172                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1173                 iov[1].iov_base = in_data;
1174                 iov[1].iov_len = indatalen;
1175                 num_iovecs = 2;
1176         } else
1177                 num_iovecs = 1;
1178
1179         req->OutputOffset = 0;
1180         req->OutputCount = 0; /* MBZ */
1181
1182         /*
1183          * Could increase MaxOutputResponse, but that would require more
1184          * than one credit. Windows typically sets this smaller, but for some
1185          * ioctls it may be useful to allow server to send more. No point
1186          * limiting what the server can send as long as fits in one credit
1187          */
1188         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1189
1190         if (is_fsctl)
1191                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1192         else
1193                 req->Flags = 0;
1194
1195         iov[0].iov_base = (char *)req;
1196
1197         /*
1198          * If no input data, the size of ioctl struct in
1199          * protocol spec still includes a 1 byte data buffer,
1200          * but if input data passed to ioctl, we do not
1201          * want to double count this, so we do not send
1202          * the dummy one byte of data in iovec[0] if sending
1203          * input data (in iovec[1]). We also must add 4 bytes
1204          * in first iovec to allow for rfc1002 length field.
1205          */
1206
1207         if (indatalen) {
1208                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1209                 inc_rfc1001_len(req, indatalen - 1);
1210         } else
1211                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1212
1213
1214         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1215         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1216
1217         if (rc != 0) {
1218                 if (tcon)
1219                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1220                 goto ioctl_exit;
1221         }
1222
1223         /* check if caller wants to look at return data or just return rc */
1224         if ((plen == NULL) || (out_data == NULL))
1225                 goto ioctl_exit;
1226
1227         *plen = le32_to_cpu(rsp->OutputCount);
1228
1229         /* We check for obvious errors in the output buffer length and offset */
1230         if (*plen == 0)
1231                 goto ioctl_exit; /* server returned no data */
1232         else if (*plen > 0xFF00) {
1233                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1234                 *plen = 0;
1235                 rc = -EIO;
1236                 goto ioctl_exit;
1237         }
1238
1239         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1240                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1241                         le32_to_cpu(rsp->OutputOffset));
1242                 *plen = 0;
1243                 rc = -EIO;
1244                 goto ioctl_exit;
1245         }
1246
1247         *out_data = kmalloc(*plen, GFP_KERNEL);
1248         if (*out_data == NULL) {
1249                 rc = -ENOMEM;
1250                 goto ioctl_exit;
1251         }
1252
1253         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1254                *plen);
1255 ioctl_exit:
1256         free_rsp_buf(resp_buftype, rsp);
1257         return rc;
1258 }
1259
1260 /*
1261  *   Individual callers to ioctl worker function follow
1262  */
1263
1264 int
1265 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1266                      u64 persistent_fid, u64 volatile_fid)
1267 {
1268         int rc;
1269         char *res_key = NULL;
1270         struct  compress_ioctl fsctl_input;
1271         char *ret_data = NULL;
1272
1273         fsctl_input.CompressionState =
1274                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1275
1276         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1277                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1278                         (char *)&fsctl_input /* data input */,
1279                         2 /* in data len */, &ret_data /* out data */, NULL);
1280
1281         cifs_dbg(FYI, "set compression rc %d\n", rc);
1282         kfree(res_key);
1283
1284         return rc;
1285 }
1286
1287 int
1288 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1289            u64 persistent_fid, u64 volatile_fid)
1290 {
1291         struct smb2_close_req *req;
1292         struct smb2_close_rsp *rsp;
1293         struct TCP_Server_Info *server;
1294         struct cifs_ses *ses = tcon->ses;
1295         struct kvec iov[1];
1296         int resp_buftype;
1297         int rc = 0;
1298
1299         cifs_dbg(FYI, "Close\n");
1300
1301         if (ses && (ses->server))
1302                 server = ses->server;
1303         else
1304                 return -EIO;
1305
1306         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1307         if (rc)
1308                 return rc;
1309
1310         req->PersistentFileId = persistent_fid;
1311         req->VolatileFileId = volatile_fid;
1312
1313         iov[0].iov_base = (char *)req;
1314         /* 4 for rfc1002 length field */
1315         iov[0].iov_len = get_rfc1002_length(req) + 4;
1316
1317         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1318         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1319
1320         if (rc != 0) {
1321                 if (tcon)
1322                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1323                 goto close_exit;
1324         }
1325
1326         /* BB FIXME - decode close response, update inode for caching */
1327
1328 close_exit:
1329         free_rsp_buf(resp_buftype, rsp);
1330         return rc;
1331 }
1332
1333 static int
1334 validate_buf(unsigned int offset, unsigned int buffer_length,
1335              struct smb2_hdr *hdr, unsigned int min_buf_size)
1336
1337 {
1338         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1339         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1340         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1341         char *end_of_buf = begin_of_buf + buffer_length;
1342
1343
1344         if (buffer_length < min_buf_size) {
1345                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1346                          buffer_length, min_buf_size);
1347                 return -EINVAL;
1348         }
1349
1350         /* check if beyond RFC1001 maximum length */
1351         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1352                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1353                          buffer_length, smb_len);
1354                 return -EINVAL;
1355         }
1356
1357         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1358                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1359                 return -EINVAL;
1360         }
1361
1362         return 0;
1363 }
1364
1365 /*
1366  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1367  * Caller must free buffer.
1368  */
1369 static int
1370 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1371                       struct smb2_hdr *hdr, unsigned int minbufsize,
1372                       char *data)
1373
1374 {
1375         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1376         int rc;
1377
1378         if (!data)
1379                 return -EINVAL;
1380
1381         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1382         if (rc)
1383                 return rc;
1384
1385         memcpy(data, begin_of_buf, buffer_length);
1386
1387         return 0;
1388 }
1389
1390 static int
1391 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1392            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1393            size_t output_len, size_t min_len, void *data)
1394 {
1395         struct smb2_query_info_req *req;
1396         struct smb2_query_info_rsp *rsp = NULL;
1397         struct kvec iov[2];
1398         int rc = 0;
1399         int resp_buftype;
1400         struct TCP_Server_Info *server;
1401         struct cifs_ses *ses = tcon->ses;
1402
1403         cifs_dbg(FYI, "Query Info\n");
1404
1405         if (ses && (ses->server))
1406                 server = ses->server;
1407         else
1408                 return -EIO;
1409
1410         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1411         if (rc)
1412                 return rc;
1413
1414         req->InfoType = SMB2_O_INFO_FILE;
1415         req->FileInfoClass = info_class;
1416         req->PersistentFileId = persistent_fid;
1417         req->VolatileFileId = volatile_fid;
1418         /* 4 for rfc1002 length field and 1 for Buffer */
1419         req->InputBufferOffset =
1420                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1421         req->OutputBufferLength = cpu_to_le32(output_len);
1422
1423         iov[0].iov_base = (char *)req;
1424         /* 4 for rfc1002 length field */
1425         iov[0].iov_len = get_rfc1002_length(req) + 4;
1426
1427         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1428         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1429
1430         if (rc) {
1431                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1432                 goto qinf_exit;
1433         }
1434
1435         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1436                                    le32_to_cpu(rsp->OutputBufferLength),
1437                                    &rsp->hdr, min_len, data);
1438
1439 qinf_exit:
1440         free_rsp_buf(resp_buftype, rsp);
1441         return rc;
1442 }
1443
1444 int
1445 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1446                 u64 persistent_fid, u64 volatile_fid,
1447                 struct smb2_file_all_info *data)
1448 {
1449         return query_info(xid, tcon, persistent_fid, volatile_fid,
1450                           FILE_ALL_INFORMATION,
1451                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1452                           sizeof(struct smb2_file_all_info), data);
1453 }
1454
1455 int
1456 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1457                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1458 {
1459         return query_info(xid, tcon, persistent_fid, volatile_fid,
1460                           FILE_INTERNAL_INFORMATION,
1461                           sizeof(struct smb2_file_internal_info),
1462                           sizeof(struct smb2_file_internal_info), uniqueid);
1463 }
1464
1465 /*
1466  * This is a no-op for now. We're not really interested in the reply, but
1467  * rather in the fact that the server sent one and that server->lstrp
1468  * gets updated.
1469  *
1470  * FIXME: maybe we should consider checking that the reply matches request?
1471  */
1472 static void
1473 smb2_echo_callback(struct mid_q_entry *mid)
1474 {
1475         struct TCP_Server_Info *server = mid->callback_data;
1476         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1477         unsigned int credits_received = 1;
1478
1479         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1480                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1481
1482         DeleteMidQEntry(mid);
1483         add_credits(server, credits_received, CIFS_ECHO_OP);
1484 }
1485
1486 int
1487 SMB2_echo(struct TCP_Server_Info *server)
1488 {
1489         struct smb2_echo_req *req;
1490         int rc = 0;
1491         struct kvec iov;
1492         struct smb_rqst rqst = { .rq_iov = &iov,
1493                                  .rq_nvec = 1 };
1494
1495         cifs_dbg(FYI, "In echo request\n");
1496
1497         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1498         if (rc)
1499                 return rc;
1500
1501         req->hdr.CreditRequest = cpu_to_le16(1);
1502
1503         iov.iov_base = (char *)req;
1504         /* 4 for rfc1002 length field */
1505         iov.iov_len = get_rfc1002_length(req) + 4;
1506
1507         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1508                              CIFS_ECHO_OP);
1509         if (rc)
1510                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1511
1512         cifs_small_buf_release(req);
1513         return rc;
1514 }
1515
1516 int
1517 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1518            u64 volatile_fid)
1519 {
1520         struct smb2_flush_req *req;
1521         struct TCP_Server_Info *server;
1522         struct cifs_ses *ses = tcon->ses;
1523         struct kvec iov[1];
1524         int resp_buftype;
1525         int rc = 0;
1526
1527         cifs_dbg(FYI, "Flush\n");
1528
1529         if (ses && (ses->server))
1530                 server = ses->server;
1531         else
1532                 return -EIO;
1533
1534         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1535         if (rc)
1536                 return rc;
1537
1538         req->PersistentFileId = persistent_fid;
1539         req->VolatileFileId = volatile_fid;
1540
1541         iov[0].iov_base = (char *)req;
1542         /* 4 for rfc1002 length field */
1543         iov[0].iov_len = get_rfc1002_length(req) + 4;
1544
1545         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1546
1547         if ((rc != 0) && tcon)
1548                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1549
1550         free_rsp_buf(resp_buftype, iov[0].iov_base);
1551         return rc;
1552 }
1553
1554 /*
1555  * To form a chain of read requests, any read requests after the first should
1556  * have the end_of_chain boolean set to true.
1557  */
1558 static int
1559 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1560                   unsigned int remaining_bytes, int request_type)
1561 {
1562         int rc = -EACCES;
1563         struct smb2_read_req *req = NULL;
1564
1565         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1566         if (rc)
1567                 return rc;
1568         if (io_parms->tcon->ses->server == NULL)
1569                 return -ECONNABORTED;
1570
1571         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1572
1573         req->PersistentFileId = io_parms->persistent_fid;
1574         req->VolatileFileId = io_parms->volatile_fid;
1575         req->ReadChannelInfoOffset = 0; /* reserved */
1576         req->ReadChannelInfoLength = 0; /* reserved */
1577         req->Channel = 0; /* reserved */
1578         req->MinimumCount = 0;
1579         req->Length = cpu_to_le32(io_parms->length);
1580         req->Offset = cpu_to_le64(io_parms->offset);
1581
1582         if (request_type & CHAINED_REQUEST) {
1583                 if (!(request_type & END_OF_CHAIN)) {
1584                         /* 4 for rfc1002 length field */
1585                         req->hdr.NextCommand =
1586                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1587                 } else /* END_OF_CHAIN */
1588                         req->hdr.NextCommand = 0;
1589                 if (request_type & RELATED_REQUEST) {
1590                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1591                         /*
1592                          * Related requests use info from previous read request
1593                          * in chain.
1594                          */
1595                         req->hdr.SessionId = 0xFFFFFFFF;
1596                         req->hdr.TreeId = 0xFFFFFFFF;
1597                         req->PersistentFileId = 0xFFFFFFFF;
1598                         req->VolatileFileId = 0xFFFFFFFF;
1599                 }
1600         }
1601         if (remaining_bytes > io_parms->length)
1602                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1603         else
1604                 req->RemainingBytes = 0;
1605
1606         iov[0].iov_base = (char *)req;
1607         /* 4 for rfc1002 length field */
1608         iov[0].iov_len = get_rfc1002_length(req) + 4;
1609         return rc;
1610 }
1611
1612 static void
1613 smb2_readv_callback(struct mid_q_entry *mid)
1614 {
1615         struct cifs_readdata *rdata = mid->callback_data;
1616         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1617         struct TCP_Server_Info *server = tcon->ses->server;
1618         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1619         unsigned int credits_received = 1;
1620         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1621                                  .rq_nvec = 1,
1622                                  .rq_pages = rdata->pages,
1623                                  .rq_npages = rdata->nr_pages,
1624                                  .rq_pagesz = rdata->pagesz,
1625                                  .rq_tailsz = rdata->tailsz };
1626
1627         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1628                  __func__, mid->mid, mid->mid_state, rdata->result,
1629                  rdata->bytes);
1630
1631         switch (mid->mid_state) {
1632         case MID_RESPONSE_RECEIVED:
1633                 credits_received = le16_to_cpu(buf->CreditRequest);
1634                 /* result already set, check signature */
1635                 if (server->sign) {
1636                         int rc;
1637
1638                         rc = smb2_verify_signature(&rqst, server);
1639                         if (rc)
1640                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1641                                          rc);
1642                 }
1643                 /* FIXME: should this be counted toward the initiating task? */
1644                 task_io_account_read(rdata->bytes);
1645                 cifs_stats_bytes_read(tcon, rdata->bytes);
1646                 break;
1647         case MID_REQUEST_SUBMITTED:
1648         case MID_RETRY_NEEDED:
1649                 rdata->result = -EAGAIN;
1650                 break;
1651         default:
1652                 if (rdata->result != -ENODATA)
1653                         rdata->result = -EIO;
1654         }
1655
1656         if (rdata->result)
1657                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1658
1659         queue_work(cifsiod_wq, &rdata->work);
1660         DeleteMidQEntry(mid);
1661         add_credits(server, credits_received, 0);
1662 }
1663
1664 /* smb2_async_readv - send an async write, and set up mid to handle result */
1665 int
1666 smb2_async_readv(struct cifs_readdata *rdata)
1667 {
1668         int rc;
1669         struct smb2_hdr *buf;
1670         struct cifs_io_parms io_parms;
1671         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1672                                  .rq_nvec = 1 };
1673
1674         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1675                  __func__, rdata->offset, rdata->bytes);
1676
1677         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1678         io_parms.offset = rdata->offset;
1679         io_parms.length = rdata->bytes;
1680         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1681         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1682         io_parms.pid = rdata->pid;
1683         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1684         if (rc)
1685                 return rc;
1686
1687         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1688         /* 4 for rfc1002 length field */
1689         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1690
1691         kref_get(&rdata->refcount);
1692         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1693                              cifs_readv_receive, smb2_readv_callback,
1694                              rdata, 0);
1695         if (rc) {
1696                 kref_put(&rdata->refcount, cifs_readdata_release);
1697                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1698         }
1699
1700         cifs_small_buf_release(buf);
1701         return rc;
1702 }
1703
1704 int
1705 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1706           unsigned int *nbytes, char **buf, int *buf_type)
1707 {
1708         int resp_buftype, rc = -EACCES;
1709         struct smb2_read_rsp *rsp = NULL;
1710         struct kvec iov[1];
1711
1712         *nbytes = 0;
1713         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1714         if (rc)
1715                 return rc;
1716
1717         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1718                           &resp_buftype, CIFS_LOG_ERROR);
1719
1720         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1721
1722         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1723                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1724                 return 0;
1725         }
1726
1727         if (rc) {
1728                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1729                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1730         } else {
1731                 *nbytes = le32_to_cpu(rsp->DataLength);
1732                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1733                     (*nbytes > io_parms->length)) {
1734                         cifs_dbg(FYI, "bad length %d for count %d\n",
1735                                  *nbytes, io_parms->length);
1736                         rc = -EIO;
1737                         *nbytes = 0;
1738                 }
1739         }
1740
1741         if (*buf) {
1742                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1743                        *nbytes);
1744                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1745         } else if (resp_buftype != CIFS_NO_BUFFER) {
1746                 *buf = iov[0].iov_base;
1747                 if (resp_buftype == CIFS_SMALL_BUFFER)
1748                         *buf_type = CIFS_SMALL_BUFFER;
1749                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1750                         *buf_type = CIFS_LARGE_BUFFER;
1751         }
1752         return rc;
1753 }
1754
1755 /*
1756  * Check the mid_state and signature on received buffer (if any), and queue the
1757  * workqueue completion task.
1758  */
1759 static void
1760 smb2_writev_callback(struct mid_q_entry *mid)
1761 {
1762         struct cifs_writedata *wdata = mid->callback_data;
1763         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1764         unsigned int written;
1765         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1766         unsigned int credits_received = 1;
1767
1768         switch (mid->mid_state) {
1769         case MID_RESPONSE_RECEIVED:
1770                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1771                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1772                 if (wdata->result != 0)
1773                         break;
1774
1775                 written = le32_to_cpu(rsp->DataLength);
1776                 /*
1777                  * Mask off high 16 bits when bytes written as returned
1778                  * by the server is greater than bytes requested by the
1779                  * client. OS/2 servers are known to set incorrect
1780                  * CountHigh values.
1781                  */
1782                 if (written > wdata->bytes)
1783                         written &= 0xFFFF;
1784
1785                 if (written < wdata->bytes)
1786                         wdata->result = -ENOSPC;
1787                 else
1788                         wdata->bytes = written;
1789                 break;
1790         case MID_REQUEST_SUBMITTED:
1791         case MID_RETRY_NEEDED:
1792                 wdata->result = -EAGAIN;
1793                 break;
1794         default:
1795                 wdata->result = -EIO;
1796                 break;
1797         }
1798
1799         if (wdata->result)
1800                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1801
1802         queue_work(cifsiod_wq, &wdata->work);
1803         DeleteMidQEntry(mid);
1804         add_credits(tcon->ses->server, credits_received, 0);
1805 }
1806
1807 /* smb2_async_writev - send an async write, and set up mid to handle result */
1808 int
1809 smb2_async_writev(struct cifs_writedata *wdata)
1810 {
1811         int rc = -EACCES;
1812         struct smb2_write_req *req = NULL;
1813         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1814         struct kvec iov;
1815         struct smb_rqst rqst;
1816
1817         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1818         if (rc)
1819                 goto async_writev_out;
1820
1821         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1822
1823         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1824         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1825         req->WriteChannelInfoOffset = 0;
1826         req->WriteChannelInfoLength = 0;
1827         req->Channel = 0;
1828         req->Offset = cpu_to_le64(wdata->offset);
1829         /* 4 for rfc1002 length field */
1830         req->DataOffset = cpu_to_le16(
1831                                 offsetof(struct smb2_write_req, Buffer) - 4);
1832         req->RemainingBytes = 0;
1833
1834         /* 4 for rfc1002 length field and 1 for Buffer */
1835         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1836         iov.iov_base = req;
1837
1838         rqst.rq_iov = &iov;
1839         rqst.rq_nvec = 1;
1840         rqst.rq_pages = wdata->pages;
1841         rqst.rq_npages = wdata->nr_pages;
1842         rqst.rq_pagesz = wdata->pagesz;
1843         rqst.rq_tailsz = wdata->tailsz;
1844
1845         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1846                  wdata->offset, wdata->bytes);
1847
1848         req->Length = cpu_to_le32(wdata->bytes);
1849
1850         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1851
1852         kref_get(&wdata->refcount);
1853         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1854                                 smb2_writev_callback, wdata, 0);
1855
1856         if (rc) {
1857                 kref_put(&wdata->refcount, cifs_writedata_release);
1858                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1859         }
1860
1861 async_writev_out:
1862         cifs_small_buf_release(req);
1863         return rc;
1864 }
1865
1866 /*
1867  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1868  * The length field from io_parms must be at least 1 and indicates a number of
1869  * elements with data to write that begins with position 1 in iov array. All
1870  * data length is specified by count.
1871  */
1872 int
1873 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1874            unsigned int *nbytes, struct kvec *iov, int n_vec)
1875 {
1876         int rc = 0;
1877         struct smb2_write_req *req = NULL;
1878         struct smb2_write_rsp *rsp = NULL;
1879         int resp_buftype;
1880         *nbytes = 0;
1881
1882         if (n_vec < 1)
1883                 return rc;
1884
1885         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1886         if (rc)
1887                 return rc;
1888
1889         if (io_parms->tcon->ses->server == NULL)
1890                 return -ECONNABORTED;
1891
1892         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1893
1894         req->PersistentFileId = io_parms->persistent_fid;
1895         req->VolatileFileId = io_parms->volatile_fid;
1896         req->WriteChannelInfoOffset = 0;
1897         req->WriteChannelInfoLength = 0;
1898         req->Channel = 0;
1899         req->Length = cpu_to_le32(io_parms->length);
1900         req->Offset = cpu_to_le64(io_parms->offset);
1901         /* 4 for rfc1002 length field */
1902         req->DataOffset = cpu_to_le16(
1903                                 offsetof(struct smb2_write_req, Buffer) - 4);
1904         req->RemainingBytes = 0;
1905
1906         iov[0].iov_base = (char *)req;
1907         /* 4 for rfc1002 length field and 1 for Buffer */
1908         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1909
1910         /* length of entire message including data to be written */
1911         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1912
1913         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1914                           &resp_buftype, 0);
1915         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1916
1917         if (rc) {
1918                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1919                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1920         } else
1921                 *nbytes = le32_to_cpu(rsp->DataLength);
1922
1923         free_rsp_buf(resp_buftype, rsp);
1924         return rc;
1925 }
1926
1927 static unsigned int
1928 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1929 {
1930         int len;
1931         unsigned int entrycount = 0;
1932         unsigned int next_offset = 0;
1933         FILE_DIRECTORY_INFO *entryptr;
1934
1935         if (bufstart == NULL)
1936                 return 0;
1937
1938         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1939
1940         while (1) {
1941                 entryptr = (FILE_DIRECTORY_INFO *)
1942                                         ((char *)entryptr + next_offset);
1943
1944                 if ((char *)entryptr + size > end_of_buf) {
1945                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1946                         break;
1947                 }
1948
1949                 len = le32_to_cpu(entryptr->FileNameLength);
1950                 if ((char *)entryptr + len + size > end_of_buf) {
1951                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1952                                  end_of_buf);
1953                         break;
1954                 }
1955
1956                 *lastentry = (char *)entryptr;
1957                 entrycount++;
1958
1959                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1960                 if (!next_offset)
1961                         break;
1962         }
1963
1964         return entrycount;
1965 }
1966
1967 /*
1968  * Readdir/FindFirst
1969  */
1970 int
1971 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1972                      u64 persistent_fid, u64 volatile_fid, int index,
1973                      struct cifs_search_info *srch_inf)
1974 {
1975         struct smb2_query_directory_req *req;
1976         struct smb2_query_directory_rsp *rsp = NULL;
1977         struct kvec iov[2];
1978         int rc = 0;
1979         int len;
1980         int resp_buftype;
1981         unsigned char *bufptr;
1982         struct TCP_Server_Info *server;
1983         struct cifs_ses *ses = tcon->ses;
1984         __le16 asteriks = cpu_to_le16('*');
1985         char *end_of_smb;
1986         unsigned int output_size = CIFSMaxBufSize;
1987         size_t info_buf_size;
1988
1989         if (ses && (ses->server))
1990                 server = ses->server;
1991         else
1992                 return -EIO;
1993
1994         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1995         if (rc)
1996                 return rc;
1997
1998         switch (srch_inf->info_level) {
1999         case SMB_FIND_FILE_DIRECTORY_INFO:
2000                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2001                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2002                 break;
2003         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2004                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2005                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2006                 break;
2007         default:
2008                 cifs_dbg(VFS, "info level %u isn't supported\n",
2009                          srch_inf->info_level);
2010                 rc = -EINVAL;
2011                 goto qdir_exit;
2012         }
2013
2014         req->FileIndex = cpu_to_le32(index);
2015         req->PersistentFileId = persistent_fid;
2016         req->VolatileFileId = volatile_fid;
2017
2018         len = 0x2;
2019         bufptr = req->Buffer;
2020         memcpy(bufptr, &asteriks, len);
2021
2022         req->FileNameOffset =
2023                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2024         req->FileNameLength = cpu_to_le16(len);
2025         /*
2026          * BB could be 30 bytes or so longer if we used SMB2 specific
2027          * buffer lengths, but this is safe and close enough.
2028          */
2029         output_size = min_t(unsigned int, output_size, server->maxBuf);
2030         output_size = min_t(unsigned int, output_size, 2 << 15);
2031         req->OutputBufferLength = cpu_to_le32(output_size);
2032
2033         iov[0].iov_base = (char *)req;
2034         /* 4 for RFC1001 length and 1 for Buffer */
2035         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2036
2037         iov[1].iov_base = (char *)(req->Buffer);
2038         iov[1].iov_len = len;
2039
2040         inc_rfc1001_len(req, len - 1 /* Buffer */);
2041
2042         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2043         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2044
2045         if (rc) {
2046                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2047                 goto qdir_exit;
2048         }
2049
2050         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2051                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2052                           info_buf_size);
2053         if (rc)
2054                 goto qdir_exit;
2055
2056         srch_inf->unicode = true;
2057
2058         if (srch_inf->ntwrk_buf_start) {
2059                 if (srch_inf->smallBuf)
2060                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2061                 else
2062                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2063         }
2064         srch_inf->ntwrk_buf_start = (char *)rsp;
2065         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2066                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2067         /* 4 for rfc1002 length field */
2068         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2069         srch_inf->entries_in_buffer =
2070                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2071                                     &srch_inf->last_entry, info_buf_size);
2072         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2073         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2074                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2075                  srch_inf->srch_entries_start, srch_inf->last_entry);
2076         if (resp_buftype == CIFS_LARGE_BUFFER)
2077                 srch_inf->smallBuf = false;
2078         else if (resp_buftype == CIFS_SMALL_BUFFER)
2079                 srch_inf->smallBuf = true;
2080         else
2081                 cifs_dbg(VFS, "illegal search buffer type\n");
2082
2083         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2084                 srch_inf->endOfSearch = 1;
2085         else
2086                 srch_inf->endOfSearch = 0;
2087
2088         return rc;
2089
2090 qdir_exit:
2091         free_rsp_buf(resp_buftype, rsp);
2092         return rc;
2093 }
2094
2095 static int
2096 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2097                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2098                unsigned int num, void **data, unsigned int *size)
2099 {
2100         struct smb2_set_info_req *req;
2101         struct smb2_set_info_rsp *rsp = NULL;
2102         struct kvec *iov;
2103         int rc = 0;
2104         int resp_buftype;
2105         unsigned int i;
2106         struct TCP_Server_Info *server;
2107         struct cifs_ses *ses = tcon->ses;
2108
2109         if (ses && (ses->server))
2110                 server = ses->server;
2111         else
2112                 return -EIO;
2113
2114         if (!num)
2115                 return -EINVAL;
2116
2117         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2118         if (!iov)
2119                 return -ENOMEM;
2120
2121         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2122         if (rc) {
2123                 kfree(iov);
2124                 return rc;
2125         }
2126
2127         req->hdr.ProcessId = cpu_to_le32(pid);
2128
2129         req->InfoType = SMB2_O_INFO_FILE;
2130         req->FileInfoClass = info_class;
2131         req->PersistentFileId = persistent_fid;
2132         req->VolatileFileId = volatile_fid;
2133
2134         /* 4 for RFC1001 length and 1 for Buffer */
2135         req->BufferOffset =
2136                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2137         req->BufferLength = cpu_to_le32(*size);
2138
2139         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2140
2141         memcpy(req->Buffer, *data, *size);
2142
2143         iov[0].iov_base = (char *)req;
2144         /* 4 for RFC1001 length */
2145         iov[0].iov_len = get_rfc1002_length(req) + 4;
2146
2147         for (i = 1; i < num; i++) {
2148                 inc_rfc1001_len(req, size[i]);
2149                 le32_add_cpu(&req->BufferLength, size[i]);
2150                 iov[i].iov_base = (char *)data[i];
2151                 iov[i].iov_len = size[i];
2152         }
2153
2154         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2155         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2156
2157         if (rc != 0) {
2158                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2159                 goto out;
2160         }
2161 out:
2162         free_rsp_buf(resp_buftype, rsp);
2163         kfree(iov);
2164         return rc;
2165 }
2166
2167 int
2168 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2169             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2170 {
2171         struct smb2_file_rename_info info;
2172         void **data;
2173         unsigned int size[2];
2174         int rc;
2175         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2176
2177         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2178         if (!data)
2179                 return -ENOMEM;
2180
2181         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2182                               /* 0 = fail if target already exists */
2183         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2184         info.FileNameLength = cpu_to_le32(len);
2185
2186         data[0] = &info;
2187         size[0] = sizeof(struct smb2_file_rename_info);
2188
2189         data[1] = target_file;
2190         size[1] = len + 2 /* null */;
2191
2192         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2193                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2194                            size);
2195         kfree(data);
2196         return rc;
2197 }
2198
2199 int
2200 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2201                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2202 {
2203         struct smb2_file_link_info info;
2204         void **data;
2205         unsigned int size[2];
2206         int rc;
2207         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2208
2209         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2210         if (!data)
2211                 return -ENOMEM;
2212
2213         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2214                               /* 0 = fail if link already exists */
2215         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2216         info.FileNameLength = cpu_to_le32(len);
2217
2218         data[0] = &info;
2219         size[0] = sizeof(struct smb2_file_link_info);
2220
2221         data[1] = target_file;
2222         size[1] = len + 2 /* null */;
2223
2224         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2225                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2226         kfree(data);
2227         return rc;
2228 }
2229
2230 int
2231 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2232              u64 volatile_fid, u32 pid, __le64 *eof)
2233 {
2234         struct smb2_file_eof_info info;
2235         void *data;
2236         unsigned int size;
2237
2238         info.EndOfFile = *eof;
2239
2240         data = &info;
2241         size = sizeof(struct smb2_file_eof_info);
2242
2243         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2244                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2245 }
2246
2247 int
2248 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2249               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2250 {
2251         unsigned int size;
2252         size = sizeof(FILE_BASIC_INFO);
2253         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2254                              current->tgid, FILE_BASIC_INFORMATION, 1,
2255                              (void **)&buf, &size);
2256 }
2257
2258 int
2259 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2260                   const u64 persistent_fid, const u64 volatile_fid,
2261                   __u8 oplock_level)
2262 {
2263         int rc;
2264         struct smb2_oplock_break *req = NULL;
2265
2266         cifs_dbg(FYI, "SMB2_oplock_break\n");
2267         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2268
2269         if (rc)
2270                 return rc;
2271
2272         req->VolatileFid = volatile_fid;
2273         req->PersistentFid = persistent_fid;
2274         req->OplockLevel = oplock_level;
2275         req->hdr.CreditRequest = cpu_to_le16(1);
2276
2277         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2278         /* SMB2 buffer freed by function above */
2279
2280         if (rc) {
2281                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2282                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2283         }
2284
2285         return rc;
2286 }
2287
2288 static void
2289 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2290                         struct kstatfs *kst)
2291 {
2292         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2293                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2294         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2295         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2296         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2297         return;
2298 }
2299
2300 static int
2301 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2302                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2303 {
2304         int rc;
2305         struct smb2_query_info_req *req;
2306
2307         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2308
2309         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2310                 return -EIO;
2311
2312         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2313         if (rc)
2314                 return rc;
2315
2316         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2317         req->FileInfoClass = level;
2318         req->PersistentFileId = persistent_fid;
2319         req->VolatileFileId = volatile_fid;
2320         /* 4 for rfc1002 length field and 1 for pad */
2321         req->InputBufferOffset =
2322                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2323         req->OutputBufferLength = cpu_to_le32(
2324                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2325
2326         iov->iov_base = (char *)req;
2327         /* 4 for rfc1002 length field */
2328         iov->iov_len = get_rfc1002_length(req) + 4;
2329         return 0;
2330 }
2331
2332 int
2333 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2334               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2335 {
2336         struct smb2_query_info_rsp *rsp = NULL;
2337         struct kvec iov;
2338         int rc = 0;
2339         int resp_buftype;
2340         struct cifs_ses *ses = tcon->ses;
2341         struct smb2_fs_full_size_info *info = NULL;
2342
2343         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2344                                 sizeof(struct smb2_fs_full_size_info),
2345                                 persistent_fid, volatile_fid);
2346         if (rc)
2347                 return rc;
2348
2349         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2350         if (rc) {
2351                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2352                 goto qfsinf_exit;
2353         }
2354         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2355
2356         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2357                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2358         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2359                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2360                           sizeof(struct smb2_fs_full_size_info));
2361         if (!rc)
2362                 copy_fs_info_to_kstatfs(info, fsdata);
2363
2364 qfsinf_exit:
2365         free_rsp_buf(resp_buftype, iov.iov_base);
2366         return rc;
2367 }
2368
2369 int
2370 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2371               u64 persistent_fid, u64 volatile_fid, int level)
2372 {
2373         struct smb2_query_info_rsp *rsp = NULL;
2374         struct kvec iov;
2375         int rc = 0;
2376         int resp_buftype, max_len, min_len;
2377         struct cifs_ses *ses = tcon->ses;
2378         unsigned int rsp_len, offset;
2379
2380         if (level == FS_DEVICE_INFORMATION) {
2381                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2382                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2383         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2384                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2385                 min_len = MIN_FS_ATTR_INFO_SIZE;
2386         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2387                 max_len = sizeof(struct smb3_fs_ss_info);
2388                 min_len = sizeof(struct smb3_fs_ss_info);
2389         } else {
2390                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2391                 return -EINVAL;
2392         }
2393
2394         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2395                                 persistent_fid, volatile_fid);
2396         if (rc)
2397                 return rc;
2398
2399         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2400         if (rc) {
2401                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2402                 goto qfsattr_exit;
2403         }
2404         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2405
2406         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2407         offset = le16_to_cpu(rsp->OutputBufferOffset);
2408         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2409         if (rc)
2410                 goto qfsattr_exit;
2411
2412         if (level == FS_ATTRIBUTE_INFORMATION)
2413                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2414                         + (char *)&rsp->hdr, min_t(unsigned int,
2415                         rsp_len, max_len));
2416         else if (level == FS_DEVICE_INFORMATION)
2417                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2418                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2419         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2420                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2421                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2422                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2423                 tcon->perf_sector_size =
2424                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2425         }
2426
2427 qfsattr_exit:
2428         free_rsp_buf(resp_buftype, iov.iov_base);
2429         return rc;
2430 }
2431
2432 int
2433 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2434            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2435            const __u32 num_lock, struct smb2_lock_element *buf)
2436 {
2437         int rc = 0;
2438         struct smb2_lock_req *req = NULL;
2439         struct kvec iov[2];
2440         int resp_buf_type;
2441         unsigned int count;
2442
2443         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2444
2445         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2446         if (rc)
2447                 return rc;
2448
2449         req->hdr.ProcessId = cpu_to_le32(pid);
2450         req->LockCount = cpu_to_le16(num_lock);
2451
2452         req->PersistentFileId = persist_fid;
2453         req->VolatileFileId = volatile_fid;
2454
2455         count = num_lock * sizeof(struct smb2_lock_element);
2456         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2457
2458         iov[0].iov_base = (char *)req;
2459         /* 4 for rfc1002 length field and count for all locks */
2460         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2461         iov[1].iov_base = (char *)buf;
2462         iov[1].iov_len = count;
2463
2464         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2465         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2466         if (rc) {
2467                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2468                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2469         }
2470
2471         return rc;
2472 }
2473
2474 int
2475 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2476           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2477           const __u64 length, const __u64 offset, const __u32 lock_flags,
2478           const bool wait)
2479 {
2480         struct smb2_lock_element lock;
2481
2482         lock.Offset = cpu_to_le64(offset);
2483         lock.Length = cpu_to_le64(length);
2484         lock.Flags = cpu_to_le32(lock_flags);
2485         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2486                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2487
2488         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2489 }
2490
2491 int
2492 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2493                  __u8 *lease_key, const __le32 lease_state)
2494 {
2495         int rc;
2496         struct smb2_lease_ack *req = NULL;
2497
2498         cifs_dbg(FYI, "SMB2_lease_break\n");
2499         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2500
2501         if (rc)
2502                 return rc;
2503
2504         req->hdr.CreditRequest = cpu_to_le16(1);
2505         req->StructureSize = cpu_to_le16(36);
2506         inc_rfc1001_len(req, 12);
2507
2508         memcpy(req->LeaseKey, lease_key, 16);
2509         req->LeaseState = lease_state;
2510
2511         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2512         /* SMB2 buffer freed by function above */
2513
2514         if (rc) {
2515                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2516                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2517         }
2518
2519         return rc;
2520 }