fs/cifs/smb2pdu.c

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