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
 495         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 496         ses->sectype = RawNTLMSSP;
 497
 498 ssetup_ntlmssp_authenticate:
 499         if (phase == NtLmChallenge)
 500                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 501
 502         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 503         if (rc)
 504                 return rc;
 505
 506         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 507         req->VcNumber = 0; /* MBZ */
 508         /* to enable echos and oplocks */
 509         req->hdr.CreditRequest = cpu_to_le16(3);
 510
 511         /* only one of SMB2 signing flags may be set in SMB2 request */
 512         if (server->sign)
 513                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 514         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 515                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 516         else
 517                 req->SecurityMode = 0;
 518
 519         req->Capabilities = 0;
 520         req->Channel = 0; /* MBZ */
 521
 522         iov[0].iov_base = (char *)req;
 523         /* 4 for rfc1002 length field and 1 for pad */
 524         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 525         if (phase == NtLmNegotiate) {
 526                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 527                                        GFP_KERNEL);
 528                 if (ntlmssp_blob == NULL) {
 529                         rc = -ENOMEM;
 530                         goto ssetup_exit;
 531                 }
 532                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 533                 if (use_spnego) {
 534                         /* blob_length = build_spnego_ntlmssp_blob(
 535                                         &security_blob,
 536                                         sizeof(struct _NEGOTIATE_MESSAGE),
 537                                         ntlmssp_blob); */
 538                         /* BB eventually need to add this */
 539                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 540                         rc = -EOPNOTSUPP;
 541                         kfree(ntlmssp_blob);
 542                         goto ssetup_exit;
 543                 } else {
 544                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 545                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 546                         security_blob = ntlmssp_blob;
 547                 }
 548         } else if (phase == NtLmAuthenticate) {
 549                 req->hdr.SessionId = ses->Suid;
 550                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 551                                        GFP_KERNEL);
 552                 if (ntlmssp_blob == NULL) {
 553                         rc = -ENOMEM;
 554                         goto ssetup_exit;
 555                 }
 556                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 557                                              nls_cp);
 558                 if (rc) {
 559                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 560                                  rc);
 561                         goto ssetup_exit; /* BB double check error handling */
 562                 }
 563                 if (use_spnego) {
 564                         /* blob_length = build_spnego_ntlmssp_blob(
 565                                                         &security_blob,
 566                                                         blob_length,
 567                                                         ntlmssp_blob); */
 568                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 569                         rc = -EOPNOTSUPP;
 570                         kfree(ntlmssp_blob);
 571                         goto ssetup_exit;
 572                 } else {
 573                         security_blob = ntlmssp_blob;
 574                 }
 575         } else {
 576                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 577                 rc = -EIO;
 578                 goto ssetup_exit;
 579         }
 580
 581         /* Testing shows that buffer offset must be at location of Buffer[0] */
 582         req->SecurityBufferOffset =
 583                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 584                                             1 /* pad */ - 4 /* rfc1001 len */);
 585         req->SecurityBufferLength = cpu_to_le16(blob_length);
 586         iov[1].iov_base = security_blob;
 587         iov[1].iov_len = blob_length;
 588
 589         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 590
 591         /* BB add code to build os and lm fields */
 592
 593         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 594                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 595
 596         kfree(security_blob);
 597         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 598         if (resp_buftype != CIFS_NO_BUFFER &&
 599             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 600                 if (phase != NtLmNegotiate) {
 601                         cifs_dbg(VFS, "Unexpected more processing error\n");
 602                         goto ssetup_exit;
 603                 }
 604                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 605                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 606                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 607                                  le16_to_cpu(rsp->SecurityBufferOffset));
 608                         rc = -EIO;
 609                         goto ssetup_exit;
 610                 }
 611
 612                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 613                 phase = NtLmChallenge; /* process ntlmssp challenge */
 614                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 615                 ses->Suid = rsp->hdr.SessionId;
 616                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 617                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 618         }
 619
 620         /*
 621          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 622          * but at least the raw NTLMSSP case works.
 623          */
 624         /*
 625          * No tcon so can't do
 626          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 627          */
 628         if (rc != 0)
 629                 goto ssetup_exit;
 630
 631         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 632 ssetup_exit:
 633         free_rsp_buf(resp_buftype, rsp);
 634
 635         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 636         if ((phase == NtLmChallenge) && (rc == 0))
 637                 goto ssetup_ntlmssp_authenticate;
 638
 639         if (!rc) {
 640                 mutex_lock(&server->srv_mutex);
 641                 if (!server->session_estab) {
 642                         server->sequence_number = 0x2;
 643                         server->session_estab = true;
 644                         if (server->ops->generate_signingkey)
 645                                 server->ops->generate_signingkey(server);
 646                 }
 647                 mutex_unlock(&server->srv_mutex);
 648
 649                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 650                 spin_lock(&GlobalMid_Lock);
 651                 ses->status = CifsGood;
 652                 ses->need_reconnect = false;
 653                 spin_unlock(&GlobalMid_Lock);
 654         }
 655
 656         if (!server->sign) {
 657                 kfree(ses->auth_key.response);
 658                 ses->auth_key.response = NULL;
 659         }
 660         kfree(ses->ntlmssp);
 661
 662         return rc;
 663 }
 664
 665 int
 666 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 667 {
 668         struct smb2_logoff_req *req; /* response is also trivial struct */
 669         int rc = 0;
 670         struct TCP_Server_Info *server;
 671
 672         cifs_dbg(FYI, "disconnect session %p\n", ses);
 673
 674         if (ses && (ses->server))
 675                 server = ses->server;
 676         else
 677                 return -EIO;
 678
 679         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 680         if (rc)
 681                 return rc;
 682
 683          /* since no tcon, smb2_init can not do this, so do here */
 684         req->hdr.SessionId = ses->Suid;
 685         if (server->sign)
 686                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 687
 688         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 689         /*
 690          * No tcon so can't do
 691          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 692          */
 693         return rc;
 694 }
 695
 696 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 697 {
 698         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 699 }
 700
 701 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 702
 703 int
 704 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 705           struct cifs_tcon *tcon, const struct nls_table *cp)
 706 {
 707         struct smb2_tree_connect_req *req;
 708         struct smb2_tree_connect_rsp *rsp = NULL;
 709         struct kvec iov[2];
 710         int rc = 0;
 711         int resp_buftype;
 712         int unc_path_len;
 713         struct TCP_Server_Info *server;
 714         __le16 *unc_path = NULL;
 715
 716         cifs_dbg(FYI, "TCON\n");
 717
 718         if ((ses->server) && tree)
 719                 server = ses->server;
 720         else
 721                 return -EIO;
 722
 723         if (tcon && tcon->bad_network_name)
 724                 return -ENOENT;
 725
 726         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 727         if (unc_path == NULL)
 728                 return -ENOMEM;
 729
 730         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 731         unc_path_len *= 2;
 732         if (unc_path_len < 2) {
 733                 kfree(unc_path);
 734                 return -EINVAL;
 735         }
 736
 737         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 738         if (rc) {
 739                 kfree(unc_path);
 740                 return rc;
 741         }
 742
 743         if (tcon == NULL) {
 744                 /* since no tcon, smb2_init can not do this, so do here */
 745                 req->hdr.SessionId = ses->Suid;
 746                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 747                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 748         }
 749
 750         iov[0].iov_base = (char *)req;
 751         /* 4 for rfc1002 length field and 1 for pad */
 752         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 753
 754         /* Testing shows that buffer offset must be at location of Buffer[0] */
 755         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 756                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 757         req->PathLength = cpu_to_le16(unc_path_len - 2);
 758         iov[1].iov_base = unc_path;
 759         iov[1].iov_len = unc_path_len;
 760
 761         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 762
 763         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 764         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 765
 766         if (rc != 0) {
 767                 if (tcon) {
 768                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 769                         tcon->need_reconnect = true;
 770                 }
 771                 goto tcon_error_exit;
 772         }
 773
 774         if (tcon == NULL) {
 775                 ses->ipc_tid = rsp->hdr.TreeId;
 776                 goto tcon_exit;
 777         }
 778
 779         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 780                 cifs_dbg(FYI, "connection to disk share\n");
 781         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 782                 tcon->ipc = true;
 783                 cifs_dbg(FYI, "connection to pipe share\n");
 784         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 785                 tcon->print = true;
 786                 cifs_dbg(FYI, "connection to printer\n");
 787         } else {
 788                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 789                 rc = -EOPNOTSUPP;
 790                 goto tcon_error_exit;
 791         }
 792
 793         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 794         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 795         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 796         tcon->tidStatus = CifsGood;
 797         tcon->need_reconnect = false;
 798         tcon->tid = rsp->hdr.TreeId;
 799         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 800
 801         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 802             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 803                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 804
 805 tcon_exit:
 806         free_rsp_buf(resp_buftype, rsp);
 807         kfree(unc_path);
 808         return rc;
 809
 810 tcon_error_exit:
 811         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 812                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 813                 tcon->bad_network_name = true;
 814         }
 815         goto tcon_exit;
 816 }
 817
 818 int
 819 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 820 {
 821         struct smb2_tree_disconnect_req *req; /* response is trivial */
 822         int rc = 0;
 823         struct TCP_Server_Info *server;
 824         struct cifs_ses *ses = tcon->ses;
 825
 826         cifs_dbg(FYI, "Tree Disconnect\n");
 827
 828         if (ses && (ses->server))
 829                 server = ses->server;
 830         else
 831                 return -EIO;
 832
 833         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 834                 return 0;
 835
 836         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 837         if (rc)
 838                 return rc;
 839
 840         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 841         if (rc)
 842                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 843
 844         return rc;
 845 }
 846
 847 static struct create_lease *
 848 create_lease_buf(u8 *lease_key, u8 oplock)
 849 {
 850         struct create_lease *buf;
 851
 852         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 853         if (!buf)
 854                 return NULL;
 855
 856         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 857         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 858         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 859                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 860                                            SMB2_LEASE_READ_CACHING;
 861         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 862                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 863         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 864                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 865                                            SMB2_LEASE_READ_CACHING |
 866                                            SMB2_LEASE_WRITE_CACHING;
 867
 868         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 869                                         (struct create_lease, lcontext));
 870         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 871         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 872                                 (struct create_lease, Name));
 873         buf->ccontext.NameLength = cpu_to_le16(4);
 874         buf->Name[0] = 'R';
 875         buf->Name[1] = 'q';
 876         buf->Name[2] = 'L';
 877         buf->Name[3] = 's';
 878         return buf;
 879 }
 880
 881 static struct create_durable *
 882 create_durable_buf(void)
 883 {
 884         struct create_durable *buf;
 885
 886         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 887         if (!buf)
 888                 return NULL;
 889
 890         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 891                                         (struct create_durable, Data));
 892         buf->ccontext.DataLength = cpu_to_le32(16);
 893         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 894                                 (struct create_durable, Name));
 895         buf->ccontext.NameLength = cpu_to_le16(4);
 896         buf->Name[0] = 'D';
 897         buf->Name[1] = 'H';
 898         buf->Name[2] = 'n';
 899         buf->Name[3] = 'Q';
 900         return buf;
 901 }
 902
 903 static struct create_durable *
 904 create_reconnect_durable_buf(struct cifs_fid *fid)
 905 {
 906         struct create_durable *buf;
 907
 908         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 909         if (!buf)
 910                 return NULL;
 911
 912         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 913                                         (struct create_durable, Data));
 914         buf->ccontext.DataLength = cpu_to_le32(16);
 915         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 916                                 (struct create_durable, Name));
 917         buf->ccontext.NameLength = cpu_to_le16(4);
 918         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 919         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 920         buf->Name[0] = 'D';
 921         buf->Name[1] = 'H';
 922         buf->Name[2] = 'n';
 923         buf->Name[3] = 'C';
 924         return buf;
 925 }
 926
 927 static __u8
 928 parse_lease_state(struct smb2_create_rsp *rsp)
 929 {
 930         char *data_offset;
 931         struct create_lease *lc;
 932         bool found = false;
 933         unsigned int next = 0;
 934         char *name;
 935
 936         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 937         lc = (struct create_lease *)data_offset;
 938         do {
 939                 lc = (struct create_lease *)((char *)lc + next);
 940                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 941                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 942                     strncmp(name, "RqLs", 4)) {
 943                         next = le32_to_cpu(lc->ccontext.Next);
 944                         continue;
 945                 }
 946                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 947                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 948                 found = true;
 949                 break;
 950         } while (next != 0);
 951
 952         if (!found)
 953                 return 0;
 954
 955         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 956 }
 957
 958 static int
 959 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
 960 {
 961         struct smb2_create_req *req = iov[0].iov_base;
 962         unsigned int num = *num_iovec;
 963
 964         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
 965         if (iov[num].iov_base == NULL)
 966                 return -ENOMEM;
 967         iov[num].iov_len = sizeof(struct create_lease);
 968         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 969         if (!req->CreateContextsOffset)
 970                 req->CreateContextsOffset = cpu_to_le32(
 971                                 sizeof(struct smb2_create_req) - 4 +
 972                                 iov[num - 1].iov_len);
 973         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_lease));
 974         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 975         *num_iovec = num + 1;
 976         return 0;
 977 }
 978
 979 static int
 980 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
 981                     struct cifs_open_parms *oparms)
 982 {
 983         struct smb2_create_req *req = iov[0].iov_base;
 984         unsigned int num = *num_iovec;
 985
 986         if (oparms->reconnect) {
 987                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
 988                 /* indicate that we don't need to relock the file */
 989                 oparms->reconnect = false;
 990         } else
 991                 iov[num].iov_base = create_durable_buf();
 992         if (iov[num].iov_base == NULL)
 993                 return -ENOMEM;
 994         iov[num].iov_len = sizeof(struct create_durable);
 995         if (!req->CreateContextsOffset)
 996                 req->CreateContextsOffset =
 997                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 998                                                                 iov[1].iov_len);
 999         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1000         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1001         *num_iovec = num + 1;
1002         return 0;
1003 }
1004
1005 int
1006 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1007           __u8 *oplock, struct smb2_file_all_info *buf,
1008           struct smb2_err_rsp **err_buf)
1009 {
1010         struct smb2_create_req *req;
1011         struct smb2_create_rsp *rsp;
1012         struct TCP_Server_Info *server;
1013         struct cifs_tcon *tcon = oparms->tcon;
1014         struct cifs_ses *ses = tcon->ses;
1015         struct kvec iov[4];
1016         int resp_buftype;
1017         int uni_path_len;
1018         __le16 *copy_path = NULL;
1019         int copy_size;
1020         int rc = 0;
1021         unsigned int num_iovecs = 2;
1022         __u32 file_attributes = 0;
1023
1024         cifs_dbg(FYI, "create/open\n");
1025
1026         if (ses && (ses->server))
1027                 server = ses->server;
1028         else
1029                 return -EIO;
1030
1031         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1032         if (rc)
1033                 return rc;
1034
1035         if (oparms->create_options & CREATE_OPTION_READONLY)
1036                 file_attributes |= ATTR_READONLY;
1037
1038         req->ImpersonationLevel = IL_IMPERSONATION;
1039         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1040         /* File attributes ignored on open (used in create though) */
1041         req->FileAttributes = cpu_to_le32(file_attributes);
1042         req->ShareAccess = FILE_SHARE_ALL_LE;
1043         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1044         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1045         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1046         /* do not count rfc1001 len field */
1047         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1048
1049         iov[0].iov_base = (char *)req;
1050         /* 4 for rfc1002 length field */
1051         iov[0].iov_len = get_rfc1002_length(req) + 4;
1052
1053         /* MUST set path len (NameLength) to 0 opening root of share */
1054         req->NameLength = cpu_to_le16(uni_path_len - 2);
1055         /* -1 since last byte is buf[0] which is sent below (path) */
1056         iov[0].iov_len--;
1057         if (uni_path_len % 8 != 0) {
1058                 copy_size = uni_path_len / 8 * 8;
1059                 if (copy_size < uni_path_len)
1060                         copy_size += 8;
1061
1062                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1063                 if (!copy_path)
1064                         return -ENOMEM;
1065                 memcpy((char *)copy_path, (const char *)path,
1066                         uni_path_len);
1067                 uni_path_len = copy_size;
1068                 path = copy_path;
1069         }
1070
1071         iov[1].iov_len = uni_path_len;
1072         iov[1].iov_base = path;
1073         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1074         inc_rfc1001_len(req, uni_path_len - 1);
1075
1076         if (!server->oplocks)
1077                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1078
1079         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1080             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1081                 req->RequestedOplockLevel = *oplock;
1082         else {
1083                 rc = add_lease_context(iov, &num_iovecs, oplock);
1084                 if (rc) {
1085                         cifs_small_buf_release(req);
1086                         kfree(copy_path);
1087                         return rc;
1088                 }
1089         }
1090
1091         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1092                 /* need to set Next field of lease context if we request it */
1093                 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1094                         struct create_context *ccontext =
1095                             (struct create_context *)iov[num_iovecs-1].iov_base;
1096                         ccontext->Next =
1097                                 cpu_to_le32(sizeof(struct create_lease));
1098                 }
1099                 rc = add_durable_context(iov, &num_iovecs, oparms);
1100                 if (rc) {
1101                         cifs_small_buf_release(req);
1102                         kfree(copy_path);
1103                         kfree(iov[num_iovecs-1].iov_base);
1104                         return rc;
1105                 }
1106         }
1107
1108         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1109         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1110
1111         if (rc != 0) {
1112                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1113                 if (err_buf)
1114                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1115                                            GFP_KERNEL);
1116                 goto creat_exit;
1117         }
1118
1119         oparms->fid->persistent_fid = rsp->PersistentFileId;
1120         oparms->fid->volatile_fid = rsp->VolatileFileId;
1121
1122         if (buf) {
1123                 memcpy(buf, &rsp->CreationTime, 32);
1124                 buf->AllocationSize = rsp->AllocationSize;
1125                 buf->EndOfFile = rsp->EndofFile;
1126                 buf->Attributes = rsp->FileAttributes;
1127                 buf->NumberOfLinks = cpu_to_le32(1);
1128                 buf->DeletePending = 0;
1129         }
1130
1131         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1132                 *oplock = parse_lease_state(rsp);
1133         else
1134                 *oplock = rsp->OplockLevel;
1135 creat_exit:
1136         kfree(copy_path);
1137         free_rsp_buf(resp_buftype, rsp);
1138         return rc;
1139 }
1140
1141 /*
1142  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1143  */
1144 int
1145 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1146            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1147            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1148 {
1149         struct smb2_ioctl_req *req;
1150         struct smb2_ioctl_rsp *rsp;
1151         struct TCP_Server_Info *server;
1152         struct cifs_ses *ses = tcon->ses;
1153         struct kvec iov[2];
1154         int resp_buftype;
1155         int num_iovecs;
1156         int rc = 0;
1157
1158         cifs_dbg(FYI, "SMB2 IOCTL\n");
1159
1160         /* zero out returned data len, in case of error */
1161         if (plen)
1162                 *plen = 0;
1163
1164         if (ses && (ses->server))
1165                 server = ses->server;
1166         else
1167                 return -EIO;
1168
1169         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1170         if (rc)
1171                 return rc;
1172
1173         req->CtlCode = cpu_to_le32(opcode);
1174         req->PersistentFileId = persistent_fid;
1175         req->VolatileFileId = volatile_fid;
1176
1177         if (indatalen) {
1178                 req->InputCount = cpu_to_le32(indatalen);
1179                 /* do not set InputOffset if no input data */
1180                 req->InputOffset =
1181                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1182                 iov[1].iov_base = in_data;
1183                 iov[1].iov_len = indatalen;
1184                 num_iovecs = 2;
1185         } else
1186                 num_iovecs = 1;
1187
1188         req->OutputOffset = 0;
1189         req->OutputCount = 0; /* MBZ */
1190
1191         /*
1192          * Could increase MaxOutputResponse, but that would require more
1193          * than one credit. Windows typically sets this smaller, but for some
1194          * ioctls it may be useful to allow server to send more. No point
1195          * limiting what the server can send as long as fits in one credit
1196          */
1197         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1198
1199         if (is_fsctl)
1200                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1201         else
1202                 req->Flags = 0;
1203
1204         iov[0].iov_base = (char *)req;
1205         /* 4 for rfc1002 length field */
1206         iov[0].iov_len = get_rfc1002_length(req) + 4;
1207
1208         if (indatalen)
1209                 inc_rfc1001_len(req, indatalen);
1210
1211         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1212         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1213
1214         if (rc != 0) {
1215                 if (tcon)
1216                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1217                 goto ioctl_exit;
1218         }
1219
1220         /* check if caller wants to look at return data or just return rc */
1221         if ((plen == NULL) || (out_data == NULL))
1222                 goto ioctl_exit;
1223
1224         *plen = le32_to_cpu(rsp->OutputCount);
1225
1226         /* We check for obvious errors in the output buffer length and offset */
1227         if (*plen == 0)
1228                 goto ioctl_exit; /* server returned no data */
1229         else if (*plen > 0xFF00) {
1230                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1231                 *plen = 0;
1232                 rc = -EIO;
1233                 goto ioctl_exit;
1234         }
1235
1236         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1237                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1238                         le32_to_cpu(rsp->OutputOffset));
1239                 *plen = 0;
1240                 rc = -EIO;
1241                 goto ioctl_exit;
1242         }
1243
1244         *out_data = kmalloc(*plen, GFP_KERNEL);
1245         if (*out_data == NULL) {
1246                 rc = -ENOMEM;
1247                 goto ioctl_exit;
1248         }
1249
1250         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1251                *plen);
1252 ioctl_exit:
1253         free_rsp_buf(resp_buftype, rsp);
1254         return rc;
1255 }
1256
1257 int
1258 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1259            u64 persistent_fid, u64 volatile_fid)
1260 {
1261         struct smb2_close_req *req;
1262         struct smb2_close_rsp *rsp;
1263         struct TCP_Server_Info *server;
1264         struct cifs_ses *ses = tcon->ses;
1265         struct kvec iov[1];
1266         int resp_buftype;
1267         int rc = 0;
1268
1269         cifs_dbg(FYI, "Close\n");
1270
1271         if (ses && (ses->server))
1272                 server = ses->server;
1273         else
1274                 return -EIO;
1275
1276         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1277         if (rc)
1278                 return rc;
1279
1280         req->PersistentFileId = persistent_fid;
1281         req->VolatileFileId = volatile_fid;
1282
1283         iov[0].iov_base = (char *)req;
1284         /* 4 for rfc1002 length field */
1285         iov[0].iov_len = get_rfc1002_length(req) + 4;
1286
1287         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1288         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1289
1290         if (rc != 0) {
1291                 if (tcon)
1292                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1293                 goto close_exit;
1294         }
1295
1296         /* BB FIXME - decode close response, update inode for caching */
1297
1298 close_exit:
1299         free_rsp_buf(resp_buftype, rsp);
1300         return rc;
1301 }
1302
1303 static int
1304 validate_buf(unsigned int offset, unsigned int buffer_length,
1305              struct smb2_hdr *hdr, unsigned int min_buf_size)
1306
1307 {
1308         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1309         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1310         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1311         char *end_of_buf = begin_of_buf + buffer_length;
1312
1313
1314         if (buffer_length < min_buf_size) {
1315                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1316                          buffer_length, min_buf_size);
1317                 return -EINVAL;
1318         }
1319
1320         /* check if beyond RFC1001 maximum length */
1321         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1322                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1323                          buffer_length, smb_len);
1324                 return -EINVAL;
1325         }
1326
1327         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1328                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1329                 return -EINVAL;
1330         }
1331
1332         return 0;
1333 }
1334
1335 /*
1336  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1337  * Caller must free buffer.
1338  */
1339 static int
1340 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1341                       struct smb2_hdr *hdr, unsigned int minbufsize,
1342                       char *data)
1343
1344 {
1345         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1346         int rc;
1347
1348         if (!data)
1349                 return -EINVAL;
1350
1351         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1352         if (rc)
1353                 return rc;
1354
1355         memcpy(data, begin_of_buf, buffer_length);
1356
1357         return 0;
1358 }
1359
1360 static int
1361 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1362            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1363            size_t output_len, size_t min_len, void *data)
1364 {
1365         struct smb2_query_info_req *req;
1366         struct smb2_query_info_rsp *rsp = NULL;
1367         struct kvec iov[2];
1368         int rc = 0;
1369         int resp_buftype;
1370         struct TCP_Server_Info *server;
1371         struct cifs_ses *ses = tcon->ses;
1372
1373         cifs_dbg(FYI, "Query Info\n");
1374
1375         if (ses && (ses->server))
1376                 server = ses->server;
1377         else
1378                 return -EIO;
1379
1380         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1381         if (rc)
1382                 return rc;
1383
1384         req->InfoType = SMB2_O_INFO_FILE;
1385         req->FileInfoClass = info_class;
1386         req->PersistentFileId = persistent_fid;
1387         req->VolatileFileId = volatile_fid;
1388         /* 4 for rfc1002 length field and 1 for Buffer */
1389         req->InputBufferOffset =
1390                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1391         req->OutputBufferLength = cpu_to_le32(output_len);
1392
1393         iov[0].iov_base = (char *)req;
1394         /* 4 for rfc1002 length field */
1395         iov[0].iov_len = get_rfc1002_length(req) + 4;
1396
1397         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1398         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1399
1400         if (rc) {
1401                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1402                 goto qinf_exit;
1403         }
1404
1405         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1406                                    le32_to_cpu(rsp->OutputBufferLength),
1407                                    &rsp->hdr, min_len, data);
1408
1409 qinf_exit:
1410         free_rsp_buf(resp_buftype, rsp);
1411         return rc;
1412 }
1413
1414 int
1415 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1416                 u64 persistent_fid, u64 volatile_fid,
1417                 struct smb2_file_all_info *data)
1418 {
1419         return query_info(xid, tcon, persistent_fid, volatile_fid,
1420                           FILE_ALL_INFORMATION,
1421                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1422                           sizeof(struct smb2_file_all_info), data);
1423 }
1424
1425 int
1426 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1427                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1428 {
1429         return query_info(xid, tcon, persistent_fid, volatile_fid,
1430                           FILE_INTERNAL_INFORMATION,
1431                           sizeof(struct smb2_file_internal_info),
1432                           sizeof(struct smb2_file_internal_info), uniqueid);
1433 }
1434
1435 /*
1436  * This is a no-op for now. We're not really interested in the reply, but
1437  * rather in the fact that the server sent one and that server->lstrp
1438  * gets updated.
1439  *
1440  * FIXME: maybe we should consider checking that the reply matches request?
1441  */
1442 static void
1443 smb2_echo_callback(struct mid_q_entry *mid)
1444 {
1445         struct TCP_Server_Info *server = mid->callback_data;
1446         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1447         unsigned int credits_received = 1;
1448
1449         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1450                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1451
1452         DeleteMidQEntry(mid);
1453         add_credits(server, credits_received, CIFS_ECHO_OP);
1454 }
1455
1456 int
1457 SMB2_echo(struct TCP_Server_Info *server)
1458 {
1459         struct smb2_echo_req *req;
1460         int rc = 0;
1461         struct kvec iov;
1462         struct smb_rqst rqst = { .rq_iov = &iov,
1463                                  .rq_nvec = 1 };
1464
1465         cifs_dbg(FYI, "In echo request\n");
1466
1467         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1468         if (rc)
1469                 return rc;
1470
1471         req->hdr.CreditRequest = cpu_to_le16(1);
1472
1473         iov.iov_base = (char *)req;
1474         /* 4 for rfc1002 length field */
1475         iov.iov_len = get_rfc1002_length(req) + 4;
1476
1477         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1478                              CIFS_ECHO_OP);
1479         if (rc)
1480                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1481
1482         cifs_small_buf_release(req);
1483         return rc;
1484 }
1485
1486 int
1487 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1488            u64 volatile_fid)
1489 {
1490         struct smb2_flush_req *req;
1491         struct TCP_Server_Info *server;
1492         struct cifs_ses *ses = tcon->ses;
1493         struct kvec iov[1];
1494         int resp_buftype;
1495         int rc = 0;
1496
1497         cifs_dbg(FYI, "Flush\n");
1498
1499         if (ses && (ses->server))
1500                 server = ses->server;
1501         else
1502                 return -EIO;
1503
1504         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1505         if (rc)
1506                 return rc;
1507
1508         req->PersistentFileId = persistent_fid;
1509         req->VolatileFileId = volatile_fid;
1510
1511         iov[0].iov_base = (char *)req;
1512         /* 4 for rfc1002 length field */
1513         iov[0].iov_len = get_rfc1002_length(req) + 4;
1514
1515         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1516
1517         if ((rc != 0) && tcon)
1518                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1519
1520         free_rsp_buf(resp_buftype, iov[0].iov_base);
1521         return rc;
1522 }
1523
1524 /*
1525  * To form a chain of read requests, any read requests after the first should
1526  * have the end_of_chain boolean set to true.
1527  */
1528 static int
1529 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1530                   unsigned int remaining_bytes, int request_type)
1531 {
1532         int rc = -EACCES;
1533         struct smb2_read_req *req = NULL;
1534
1535         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1536         if (rc)
1537                 return rc;
1538         if (io_parms->tcon->ses->server == NULL)
1539                 return -ECONNABORTED;
1540
1541         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1542
1543         req->PersistentFileId = io_parms->persistent_fid;
1544         req->VolatileFileId = io_parms->volatile_fid;
1545         req->ReadChannelInfoOffset = 0; /* reserved */
1546         req->ReadChannelInfoLength = 0; /* reserved */
1547         req->Channel = 0; /* reserved */
1548         req->MinimumCount = 0;
1549         req->Length = cpu_to_le32(io_parms->length);
1550         req->Offset = cpu_to_le64(io_parms->offset);
1551
1552         if (request_type & CHAINED_REQUEST) {
1553                 if (!(request_type & END_OF_CHAIN)) {
1554                         /* 4 for rfc1002 length field */
1555                         req->hdr.NextCommand =
1556                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1557                 } else /* END_OF_CHAIN */
1558                         req->hdr.NextCommand = 0;
1559                 if (request_type & RELATED_REQUEST) {
1560                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1561                         /*
1562                          * Related requests use info from previous read request
1563                          * in chain.
1564                          */
1565                         req->hdr.SessionId = 0xFFFFFFFF;
1566                         req->hdr.TreeId = 0xFFFFFFFF;
1567                         req->PersistentFileId = 0xFFFFFFFF;
1568                         req->VolatileFileId = 0xFFFFFFFF;
1569                 }
1570         }
1571         if (remaining_bytes > io_parms->length)
1572                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1573         else
1574                 req->RemainingBytes = 0;
1575
1576         iov[0].iov_base = (char *)req;
1577         /* 4 for rfc1002 length field */
1578         iov[0].iov_len = get_rfc1002_length(req) + 4;
1579         return rc;
1580 }
1581
1582 static void
1583 smb2_readv_callback(struct mid_q_entry *mid)
1584 {
1585         struct cifs_readdata *rdata = mid->callback_data;
1586         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1587         struct TCP_Server_Info *server = tcon->ses->server;
1588         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1589         unsigned int credits_received = 1;
1590         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1591                                  .rq_nvec = 1,
1592                                  .rq_pages = rdata->pages,
1593                                  .rq_npages = rdata->nr_pages,
1594                                  .rq_pagesz = rdata->pagesz,
1595                                  .rq_tailsz = rdata->tailsz };
1596
1597         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1598                  __func__, mid->mid, mid->mid_state, rdata->result,
1599                  rdata->bytes);
1600
1601         switch (mid->mid_state) {
1602         case MID_RESPONSE_RECEIVED:
1603                 credits_received = le16_to_cpu(buf->CreditRequest);
1604                 /* result already set, check signature */
1605                 if (server->sign) {
1606                         int rc;
1607
1608                         rc = smb2_verify_signature(&rqst, server);
1609                         if (rc)
1610                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1611                                          rc);
1612                 }
1613                 /* FIXME: should this be counted toward the initiating task? */
1614                 task_io_account_read(rdata->bytes);
1615                 cifs_stats_bytes_read(tcon, rdata->bytes);
1616                 break;
1617         case MID_REQUEST_SUBMITTED:
1618         case MID_RETRY_NEEDED:
1619                 rdata->result = -EAGAIN;
1620                 break;
1621         default:
1622                 if (rdata->result != -ENODATA)
1623                         rdata->result = -EIO;
1624         }
1625
1626         if (rdata->result)
1627                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1628
1629         queue_work(cifsiod_wq, &rdata->work);
1630         DeleteMidQEntry(mid);
1631         add_credits(server, credits_received, 0);
1632 }
1633
1634 /* smb2_async_readv - send an async write, and set up mid to handle result */
1635 int
1636 smb2_async_readv(struct cifs_readdata *rdata)
1637 {
1638         int rc;
1639         struct smb2_hdr *buf;
1640         struct cifs_io_parms io_parms;
1641         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1642                                  .rq_nvec = 1 };
1643
1644         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1645                  __func__, rdata->offset, rdata->bytes);
1646
1647         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1648         io_parms.offset = rdata->offset;
1649         io_parms.length = rdata->bytes;
1650         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1651         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1652         io_parms.pid = rdata->pid;
1653         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1654         if (rc)
1655                 return rc;
1656
1657         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1658         /* 4 for rfc1002 length field */
1659         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1660
1661         kref_get(&rdata->refcount);
1662         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1663                              cifs_readv_receive, smb2_readv_callback,
1664                              rdata, 0);
1665         if (rc) {
1666                 kref_put(&rdata->refcount, cifs_readdata_release);
1667                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1668         }
1669
1670         cifs_small_buf_release(buf);
1671         return rc;
1672 }
1673
1674 int
1675 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1676           unsigned int *nbytes, char **buf, int *buf_type)
1677 {
1678         int resp_buftype, rc = -EACCES;
1679         struct smb2_read_rsp *rsp = NULL;
1680         struct kvec iov[1];
1681
1682         *nbytes = 0;
1683         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1684         if (rc)
1685                 return rc;
1686
1687         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1688                           &resp_buftype, CIFS_LOG_ERROR);
1689
1690         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1691
1692         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1693                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1694                 return 0;
1695         }
1696
1697         if (rc) {
1698                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1699                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1700         } else {
1701                 *nbytes = le32_to_cpu(rsp->DataLength);
1702                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1703                     (*nbytes > io_parms->length)) {
1704                         cifs_dbg(FYI, "bad length %d for count %d\n",
1705                                  *nbytes, io_parms->length);
1706                         rc = -EIO;
1707                         *nbytes = 0;
1708                 }
1709         }
1710
1711         if (*buf) {
1712                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1713                        *nbytes);
1714                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1715         } else if (resp_buftype != CIFS_NO_BUFFER) {
1716                 *buf = iov[0].iov_base;
1717                 if (resp_buftype == CIFS_SMALL_BUFFER)
1718                         *buf_type = CIFS_SMALL_BUFFER;
1719                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1720                         *buf_type = CIFS_LARGE_BUFFER;
1721         }
1722         return rc;
1723 }
1724
1725 /*
1726  * Check the mid_state and signature on received buffer (if any), and queue the
1727  * workqueue completion task.
1728  */
1729 static void
1730 smb2_writev_callback(struct mid_q_entry *mid)
1731 {
1732         struct cifs_writedata *wdata = mid->callback_data;
1733         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1734         unsigned int written;
1735         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1736         unsigned int credits_received = 1;
1737
1738         switch (mid->mid_state) {
1739         case MID_RESPONSE_RECEIVED:
1740                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1741                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1742                 if (wdata->result != 0)
1743                         break;
1744
1745                 written = le32_to_cpu(rsp->DataLength);
1746                 /*
1747                  * Mask off high 16 bits when bytes written as returned
1748                  * by the server is greater than bytes requested by the
1749                  * client. OS/2 servers are known to set incorrect
1750                  * CountHigh values.
1751                  */
1752                 if (written > wdata->bytes)
1753                         written &= 0xFFFF;
1754
1755                 if (written < wdata->bytes)
1756                         wdata->result = -ENOSPC;
1757                 else
1758                         wdata->bytes = written;
1759                 break;
1760         case MID_REQUEST_SUBMITTED:
1761         case MID_RETRY_NEEDED:
1762                 wdata->result = -EAGAIN;
1763                 break;
1764         default:
1765                 wdata->result = -EIO;
1766                 break;
1767         }
1768
1769         if (wdata->result)
1770                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1771
1772         queue_work(cifsiod_wq, &wdata->work);
1773         DeleteMidQEntry(mid);
1774         add_credits(tcon->ses->server, credits_received, 0);
1775 }
1776
1777 /* smb2_async_writev - send an async write, and set up mid to handle result */
1778 int
1779 smb2_async_writev(struct cifs_writedata *wdata)
1780 {
1781         int rc = -EACCES;
1782         struct smb2_write_req *req = NULL;
1783         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1784         struct kvec iov;
1785         struct smb_rqst rqst;
1786
1787         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1788         if (rc)
1789                 goto async_writev_out;
1790
1791         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1792
1793         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1794         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1795         req->WriteChannelInfoOffset = 0;
1796         req->WriteChannelInfoLength = 0;
1797         req->Channel = 0;
1798         req->Offset = cpu_to_le64(wdata->offset);
1799         /* 4 for rfc1002 length field */
1800         req->DataOffset = cpu_to_le16(
1801                                 offsetof(struct smb2_write_req, Buffer) - 4);
1802         req->RemainingBytes = 0;
1803
1804         /* 4 for rfc1002 length field and 1 for Buffer */
1805         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1806         iov.iov_base = req;
1807
1808         rqst.rq_iov = &iov;
1809         rqst.rq_nvec = 1;
1810         rqst.rq_pages = wdata->pages;
1811         rqst.rq_npages = wdata->nr_pages;
1812         rqst.rq_pagesz = wdata->pagesz;
1813         rqst.rq_tailsz = wdata->tailsz;
1814
1815         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1816                  wdata->offset, wdata->bytes);
1817
1818         req->Length = cpu_to_le32(wdata->bytes);
1819
1820         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1821
1822         kref_get(&wdata->refcount);
1823         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1824                                 smb2_writev_callback, wdata, 0);
1825
1826         if (rc) {
1827                 kref_put(&wdata->refcount, cifs_writedata_release);
1828                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1829         }
1830
1831 async_writev_out:
1832         cifs_small_buf_release(req);
1833         return rc;
1834 }
1835
1836 /*
1837  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1838  * The length field from io_parms must be at least 1 and indicates a number of
1839  * elements with data to write that begins with position 1 in iov array. All
1840  * data length is specified by count.
1841  */
1842 int
1843 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1844            unsigned int *nbytes, struct kvec *iov, int n_vec)
1845 {
1846         int rc = 0;
1847         struct smb2_write_req *req = NULL;
1848         struct smb2_write_rsp *rsp = NULL;
1849         int resp_buftype;
1850         *nbytes = 0;
1851
1852         if (n_vec < 1)
1853                 return rc;
1854
1855         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1856         if (rc)
1857                 return rc;
1858
1859         if (io_parms->tcon->ses->server == NULL)
1860                 return -ECONNABORTED;
1861
1862         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1863
1864         req->PersistentFileId = io_parms->persistent_fid;
1865         req->VolatileFileId = io_parms->volatile_fid;
1866         req->WriteChannelInfoOffset = 0;
1867         req->WriteChannelInfoLength = 0;
1868         req->Channel = 0;
1869         req->Length = cpu_to_le32(io_parms->length);
1870         req->Offset = cpu_to_le64(io_parms->offset);
1871         /* 4 for rfc1002 length field */
1872         req->DataOffset = cpu_to_le16(
1873                                 offsetof(struct smb2_write_req, Buffer) - 4);
1874         req->RemainingBytes = 0;
1875
1876         iov[0].iov_base = (char *)req;
1877         /* 4 for rfc1002 length field and 1 for Buffer */
1878         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1879
1880         /* length of entire message including data to be written */
1881         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1882
1883         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1884                           &resp_buftype, 0);
1885         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1886
1887         if (rc) {
1888                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1889                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1890         } else
1891                 *nbytes = le32_to_cpu(rsp->DataLength);
1892
1893         free_rsp_buf(resp_buftype, rsp);
1894         return rc;
1895 }
1896
1897 static unsigned int
1898 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1899 {
1900         int len;
1901         unsigned int entrycount = 0;
1902         unsigned int next_offset = 0;
1903         FILE_DIRECTORY_INFO *entryptr;
1904
1905         if (bufstart == NULL)
1906                 return 0;
1907
1908         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1909
1910         while (1) {
1911                 entryptr = (FILE_DIRECTORY_INFO *)
1912                                         ((char *)entryptr + next_offset);
1913
1914                 if ((char *)entryptr + size > end_of_buf) {
1915                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1916                         break;
1917                 }
1918
1919                 len = le32_to_cpu(entryptr->FileNameLength);
1920                 if ((char *)entryptr + len + size > end_of_buf) {
1921                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1922                                  end_of_buf);
1923                         break;
1924                 }
1925
1926                 *lastentry = (char *)entryptr;
1927                 entrycount++;
1928
1929                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1930                 if (!next_offset)
1931                         break;
1932         }
1933
1934         return entrycount;
1935 }
1936
1937 /*
1938  * Readdir/FindFirst
1939  */
1940 int
1941 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1942                      u64 persistent_fid, u64 volatile_fid, int index,
1943                      struct cifs_search_info *srch_inf)
1944 {
1945         struct smb2_query_directory_req *req;
1946         struct smb2_query_directory_rsp *rsp = NULL;
1947         struct kvec iov[2];
1948         int rc = 0;
1949         int len;
1950         int resp_buftype;
1951         unsigned char *bufptr;
1952         struct TCP_Server_Info *server;
1953         struct cifs_ses *ses = tcon->ses;
1954         __le16 asteriks = cpu_to_le16('*');
1955         char *end_of_smb;
1956         unsigned int output_size = CIFSMaxBufSize;
1957         size_t info_buf_size;
1958
1959         if (ses && (ses->server))
1960                 server = ses->server;
1961         else
1962                 return -EIO;
1963
1964         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1965         if (rc)
1966                 return rc;
1967
1968         switch (srch_inf->info_level) {
1969         case SMB_FIND_FILE_DIRECTORY_INFO:
1970                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1971                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1972                 break;
1973         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1974                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1975                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1976                 break;
1977         default:
1978                 cifs_dbg(VFS, "info level %u isn't supported\n",
1979                          srch_inf->info_level);
1980                 rc = -EINVAL;
1981                 goto qdir_exit;
1982         }
1983
1984         req->FileIndex = cpu_to_le32(index);
1985         req->PersistentFileId = persistent_fid;
1986         req->VolatileFileId = volatile_fid;
1987
1988         len = 0x2;
1989         bufptr = req->Buffer;
1990         memcpy(bufptr, &asteriks, len);
1991
1992         req->FileNameOffset =
1993                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1994         req->FileNameLength = cpu_to_le16(len);
1995         /*
1996          * BB could be 30 bytes or so longer if we used SMB2 specific
1997          * buffer lengths, but this is safe and close enough.
1998          */
1999         output_size = min_t(unsigned int, output_size, server->maxBuf);
2000         output_size = min_t(unsigned int, output_size, 2 << 15);
2001         req->OutputBufferLength = cpu_to_le32(output_size);
2002
2003         iov[0].iov_base = (char *)req;
2004         /* 4 for RFC1001 length and 1 for Buffer */
2005         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2006
2007         iov[1].iov_base = (char *)(req->Buffer);
2008         iov[1].iov_len = len;
2009
2010         inc_rfc1001_len(req, len - 1 /* Buffer */);
2011
2012         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2013         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2014
2015         if (rc) {
2016                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2017                 goto qdir_exit;
2018         }
2019
2020         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2021                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2022                           info_buf_size);
2023         if (rc)
2024                 goto qdir_exit;
2025
2026         srch_inf->unicode = true;
2027
2028         if (srch_inf->ntwrk_buf_start) {
2029                 if (srch_inf->smallBuf)
2030                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2031                 else
2032                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2033         }
2034         srch_inf->ntwrk_buf_start = (char *)rsp;
2035         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2036                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2037         /* 4 for rfc1002 length field */
2038         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2039         srch_inf->entries_in_buffer =
2040                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2041                                     &srch_inf->last_entry, info_buf_size);
2042         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2043         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2044                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2045                  srch_inf->srch_entries_start, srch_inf->last_entry);
2046         if (resp_buftype == CIFS_LARGE_BUFFER)
2047                 srch_inf->smallBuf = false;
2048         else if (resp_buftype == CIFS_SMALL_BUFFER)
2049                 srch_inf->smallBuf = true;
2050         else
2051                 cifs_dbg(VFS, "illegal search buffer type\n");
2052
2053         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2054                 srch_inf->endOfSearch = 1;
2055         else
2056                 srch_inf->endOfSearch = 0;
2057
2058         return rc;
2059
2060 qdir_exit:
2061         free_rsp_buf(resp_buftype, rsp);
2062         return rc;
2063 }
2064
2065 static int
2066 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2067                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2068                unsigned int num, void **data, unsigned int *size)
2069 {
2070         struct smb2_set_info_req *req;
2071         struct smb2_set_info_rsp *rsp = NULL;
2072         struct kvec *iov;
2073         int rc = 0;
2074         int resp_buftype;
2075         unsigned int i;
2076         struct TCP_Server_Info *server;
2077         struct cifs_ses *ses = tcon->ses;
2078
2079         if (ses && (ses->server))
2080                 server = ses->server;
2081         else
2082                 return -EIO;
2083
2084         if (!num)
2085                 return -EINVAL;
2086
2087         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2088         if (!iov)
2089                 return -ENOMEM;
2090
2091         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2092         if (rc) {
2093                 kfree(iov);
2094                 return rc;
2095         }
2096
2097         req->hdr.ProcessId = cpu_to_le32(pid);
2098
2099         req->InfoType = SMB2_O_INFO_FILE;
2100         req->FileInfoClass = info_class;
2101         req->PersistentFileId = persistent_fid;
2102         req->VolatileFileId = volatile_fid;
2103
2104         /* 4 for RFC1001 length and 1 for Buffer */
2105         req->BufferOffset =
2106                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2107         req->BufferLength = cpu_to_le32(*size);
2108
2109         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2110
2111         memcpy(req->Buffer, *data, *size);
2112
2113         iov[0].iov_base = (char *)req;
2114         /* 4 for RFC1001 length */
2115         iov[0].iov_len = get_rfc1002_length(req) + 4;
2116
2117         for (i = 1; i < num; i++) {
2118                 inc_rfc1001_len(req, size[i]);
2119                 le32_add_cpu(&req->BufferLength, size[i]);
2120                 iov[i].iov_base = (char *)data[i];
2121                 iov[i].iov_len = size[i];
2122         }
2123
2124         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2125         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2126
2127         if (rc != 0) {
2128                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2129                 goto out;
2130         }
2131 out:
2132         free_rsp_buf(resp_buftype, rsp);
2133         kfree(iov);
2134         return rc;
2135 }
2136
2137 int
2138 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2139             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2140 {
2141         struct smb2_file_rename_info info;
2142         void **data;
2143         unsigned int size[2];
2144         int rc;
2145         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2146
2147         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2148         if (!data)
2149                 return -ENOMEM;
2150
2151         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2152                               /* 0 = fail if target already exists */
2153         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2154         info.FileNameLength = cpu_to_le32(len);
2155
2156         data[0] = &info;
2157         size[0] = sizeof(struct smb2_file_rename_info);
2158
2159         data[1] = target_file;
2160         size[1] = len + 2 /* null */;
2161
2162         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2163                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2164                            size);
2165         kfree(data);
2166         return rc;
2167 }
2168
2169 int
2170 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2171                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2172 {
2173         struct smb2_file_link_info info;
2174         void **data;
2175         unsigned int size[2];
2176         int rc;
2177         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2178
2179         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2180         if (!data)
2181                 return -ENOMEM;
2182
2183         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2184                               /* 0 = fail if link already exists */
2185         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2186         info.FileNameLength = cpu_to_le32(len);
2187
2188         data[0] = &info;
2189         size[0] = sizeof(struct smb2_file_link_info);
2190
2191         data[1] = target_file;
2192         size[1] = len + 2 /* null */;
2193
2194         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2195                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2196         kfree(data);
2197         return rc;
2198 }
2199
2200 int
2201 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2202              u64 volatile_fid, u32 pid, __le64 *eof)
2203 {
2204         struct smb2_file_eof_info info;
2205         void *data;
2206         unsigned int size;
2207
2208         info.EndOfFile = *eof;
2209
2210         data = &info;
2211         size = sizeof(struct smb2_file_eof_info);
2212
2213         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2214                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2215 }
2216
2217 int
2218 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2219               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2220 {
2221         unsigned int size;
2222         size = sizeof(FILE_BASIC_INFO);
2223         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2224                              current->tgid, FILE_BASIC_INFORMATION, 1,
2225                              (void **)&buf, &size);
2226 }
2227
2228 int
2229 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2230                   const u64 persistent_fid, const u64 volatile_fid,
2231                   __u8 oplock_level)
2232 {
2233         int rc;
2234         struct smb2_oplock_break *req = NULL;
2235
2236         cifs_dbg(FYI, "SMB2_oplock_break\n");
2237         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2238
2239         if (rc)
2240                 return rc;
2241
2242         req->VolatileFid = volatile_fid;
2243         req->PersistentFid = persistent_fid;
2244         req->OplockLevel = oplock_level;
2245         req->hdr.CreditRequest = cpu_to_le16(1);
2246
2247         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2248         /* SMB2 buffer freed by function above */
2249
2250         if (rc) {
2251                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2252                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2253         }
2254
2255         return rc;
2256 }
2257
2258 static void
2259 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2260                         struct kstatfs *kst)
2261 {
2262         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2263                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2264         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2265         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2266         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2267         return;
2268 }
2269
2270 static int
2271 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2272                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2273 {
2274         int rc;
2275         struct smb2_query_info_req *req;
2276
2277         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2278
2279         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2280                 return -EIO;
2281
2282         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2283         if (rc)
2284                 return rc;
2285
2286         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2287         req->FileInfoClass = level;
2288         req->PersistentFileId = persistent_fid;
2289         req->VolatileFileId = volatile_fid;
2290         /* 4 for rfc1002 length field and 1 for pad */
2291         req->InputBufferOffset =
2292                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2293         req->OutputBufferLength = cpu_to_le32(
2294                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2295
2296         iov->iov_base = (char *)req;
2297         /* 4 for rfc1002 length field */
2298         iov->iov_len = get_rfc1002_length(req) + 4;
2299         return 0;
2300 }
2301
2302 int
2303 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2304               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2305 {
2306         struct smb2_query_info_rsp *rsp = NULL;
2307         struct kvec iov;
2308         int rc = 0;
2309         int resp_buftype;
2310         struct cifs_ses *ses = tcon->ses;
2311         struct smb2_fs_full_size_info *info = NULL;
2312
2313         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2314                                 sizeof(struct smb2_fs_full_size_info),
2315                                 persistent_fid, volatile_fid);
2316         if (rc)
2317                 return rc;
2318
2319         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2320         if (rc) {
2321                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2322                 goto qinf_exit;
2323         }
2324         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2325
2326         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2327                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2328         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2329                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2330                           sizeof(struct smb2_fs_full_size_info));
2331         if (!rc)
2332                 copy_fs_info_to_kstatfs(info, fsdata);
2333
2334 qinf_exit:
2335         free_rsp_buf(resp_buftype, iov.iov_base);
2336         return rc;
2337 }
2338
2339 int
2340 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2341            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2342            const __u32 num_lock, struct smb2_lock_element *buf)
2343 {
2344         int rc = 0;
2345         struct smb2_lock_req *req = NULL;
2346         struct kvec iov[2];
2347         int resp_buf_type;
2348         unsigned int count;
2349
2350         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2351
2352         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2353         if (rc)
2354                 return rc;
2355
2356         req->hdr.ProcessId = cpu_to_le32(pid);
2357         req->LockCount = cpu_to_le16(num_lock);
2358
2359         req->PersistentFileId = persist_fid;
2360         req->VolatileFileId = volatile_fid;
2361
2362         count = num_lock * sizeof(struct smb2_lock_element);
2363         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2364
2365         iov[0].iov_base = (char *)req;
2366         /* 4 for rfc1002 length field and count for all locks */
2367         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2368         iov[1].iov_base = (char *)buf;
2369         iov[1].iov_len = count;
2370
2371         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2372         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2373         if (rc) {
2374                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2375                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2376         }
2377
2378         return rc;
2379 }
2380
2381 int
2382 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2383           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2384           const __u64 length, const __u64 offset, const __u32 lock_flags,
2385           const bool wait)
2386 {
2387         struct smb2_lock_element lock;
2388
2389         lock.Offset = cpu_to_le64(offset);
2390         lock.Length = cpu_to_le64(length);
2391         lock.Flags = cpu_to_le32(lock_flags);
2392         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2393                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2394
2395         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2396 }
2397
2398 int
2399 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2400                  __u8 *lease_key, const __le32 lease_state)
2401 {
2402         int rc;
2403         struct smb2_lease_ack *req = NULL;
2404
2405         cifs_dbg(FYI, "SMB2_lease_break\n");
2406         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2407
2408         if (rc)
2409                 return rc;
2410
2411         req->hdr.CreditRequest = cpu_to_le16(1);
2412         req->StructureSize = cpu_to_le16(36);
2413         inc_rfc1001_len(req, 12);
2414
2415         memcpy(req->LeaseKey, lease_key, 16);
2416         req->LeaseState = lease_state;
2417
2418         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2419         /* SMB2 buffer freed by function above */
2420
2421         if (rc) {
2422                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2423                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2424         }
2425
2426         return rc;
2427 }