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         /* ClientGUID must be zero for SMB2.02 dialect */
 379         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 380                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 381         else
 382                 memcpy(req->ClientGUID, server->client_guid,
 383                         SMB2_CLIENT_GUID_SIZE);
 384
 385         iov[0].iov_base = (char *)req;
 386         /* 4 for rfc1002 length field */
 387         iov[0].iov_len = get_rfc1002_length(req) + 4;
 388
 389         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 390
 391         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 392         /*
 393          * No tcon so can't do
 394          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 395          */
 396         if (rc != 0)
 397                 goto neg_exit;
 398
 399         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 400
 401         /* BB we may eventually want to match the negotiated vs. requested
 402            dialect, even though we are only requesting one at a time */
 403         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 404                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 405         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 406                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 407         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 408                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 409         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 410                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 411         else {
 412                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 413                          le16_to_cpu(rsp->DialectRevision));
 414                 rc = -EIO;
 415                 goto neg_exit;
 416         }
 417         server->dialect = le16_to_cpu(rsp->DialectRevision);
 418
 419         /* SMB2 only has an extended negflavor */
 420         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 421         /* set it to the maximum buffer size value we can send with 1 credit */
 422         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 423                                SMB2_MAX_BUFFER_SIZE);
 424         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 425         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 426         /* BB Do we need to validate the SecurityMode? */
 427         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 428         server->capabilities = le32_to_cpu(rsp->Capabilities);
 429         /* Internal types */
 430         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 431
 432         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 433                                                &rsp->hdr);
 434         /*
 435          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 436          * for us will be
 437          *      ses->sectype = RawNTLMSSP;
 438          * but for time being this is our only auth choice so doesn't matter.
 439          * We just found a server which sets blob length to zero expecting raw.
 440          */
 441         if (blob_length == 0)
 442                 cifs_dbg(FYI, "missing security blob on negprot\n");
 443
 444         rc = cifs_enable_signing(server, ses->sign);
 445 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 446         if (rc)
 447                 goto neg_exit;
 448         if (blob_length)
 449                 rc = decode_neg_token_init(security_blob, blob_length,
 450                                    &server->sec_type);
 451         if (rc == 1)
 452                 rc = 0;
 453         else if (rc == 0) {
 454                 rc = -EIO;
 455                 goto neg_exit;
 456         }
 457 #endif
 458
 459 neg_exit:
 460         free_rsp_buf(resp_buftype, rsp);
 461         return rc;
 462 }
 463
 464 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 465 {
 466         int rc = 0;
 467         struct validate_negotiate_info_req vneg_inbuf;
 468         struct validate_negotiate_info_rsp *pneg_rsp;
 469         u32 rsplen;
 470
 471         cifs_dbg(FYI, "validate negotiate\n");
 472
 473         /*
 474          * validation ioctl must be signed, so no point sending this if we
 475          * can not sign it.  We could eventually change this to selectively
 476          * sign just this, the first and only signed request on a connection.
 477          * This is good enough for now since a user who wants better security
 478          * would also enable signing on the mount. Having validation of
 479          * negotiate info for signed connections helps reduce attack vectors
 480          */
 481         if (tcon->ses->server->sign == false)
 482                 return 0; /* validation requires signing */
 483
 484         vneg_inbuf.Capabilities =
 485                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 486         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 487                                         SMB2_CLIENT_GUID_SIZE);
 488
 489         if (tcon->ses->sign)
 490                 vneg_inbuf.SecurityMode =
 491                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 492         else if (global_secflags & CIFSSEC_MAY_SIGN)
 493                 vneg_inbuf.SecurityMode =
 494                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 495         else
 496                 vneg_inbuf.SecurityMode = 0;
 497
 498         vneg_inbuf.DialectCount = cpu_to_le16(1);
 499         vneg_inbuf.Dialects[0] =
 500                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 501
 502         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 503                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 504                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 505                 (char **)&pneg_rsp, &rsplen);
 506
 507         if (rc != 0) {
 508                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 509                 return -EIO;
 510         }
 511
 512         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 513                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 514                 return -EIO;
 515         }
 516
 517         /* check validate negotiate info response matches what we got earlier */
 518         if (pneg_rsp->Dialect !=
 519                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 520                 goto vneg_out;
 521
 522         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 523                 goto vneg_out;
 524
 525         /* do not validate server guid because not saved at negprot time yet */
 526
 527         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 528               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 529                 goto vneg_out;
 530
 531         /* validate negotiate successful */
 532         cifs_dbg(FYI, "validate negotiate info successful\n");
 533         return 0;
 534
 535 vneg_out:
 536         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 537         return -EIO;
 538 }
 539
 540 int
 541 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 542                 const struct nls_table *nls_cp)
 543 {
 544         struct smb2_sess_setup_req *req;
 545         struct smb2_sess_setup_rsp *rsp = NULL;
 546         struct kvec iov[2];
 547         int rc = 0;
 548         int resp_buftype;
 549         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 550         struct TCP_Server_Info *server = ses->server;
 551         u16 blob_length = 0;
 552         char *security_blob;
 553         char *ntlmssp_blob = NULL;
 554         bool use_spnego = false; /* else use raw ntlmssp */
 555
 556         cifs_dbg(FYI, "Session Setup\n");
 557
 558         if (!server) {
 559                 WARN(1, "%s: server is NULL!\n", __func__);
 560                 return -EIO;
 561         }
 562
 563         /*
 564          * If we are here due to reconnect, free per-smb session key
 565          * in case signing was required.
 566          */
 567         kfree(ses->auth_key.response);
 568         ses->auth_key.response = NULL;
 569
 570         /*
 571          * If memory allocation is successful, caller of this function
 572          * frees it.
 573          */
 574         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 575         if (!ses->ntlmssp)
 576                 return -ENOMEM;
 577         ses->ntlmssp->sesskey_per_smbsess = true;
 578
 579         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 580         ses->sectype = RawNTLMSSP;
 581
 582 ssetup_ntlmssp_authenticate:
 583         if (phase == NtLmChallenge)
 584                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 585
 586         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 587         if (rc)
 588                 return rc;
 589
 590         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 591         req->VcNumber = 0; /* MBZ */
 592         /* to enable echos and oplocks */
 593         req->hdr.CreditRequest = cpu_to_le16(3);
 594
 595         /* only one of SMB2 signing flags may be set in SMB2 request */
 596         if (server->sign)
 597                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 598         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 599                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 600         else
 601                 req->SecurityMode = 0;
 602
 603         req->Capabilities = 0;
 604         req->Channel = 0; /* MBZ */
 605
 606         iov[0].iov_base = (char *)req;
 607         /* 4 for rfc1002 length field and 1 for pad */
 608         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 609         if (phase == NtLmNegotiate) {
 610                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 611                                        GFP_KERNEL);
 612                 if (ntlmssp_blob == NULL) {
 613                         rc = -ENOMEM;
 614                         goto ssetup_exit;
 615                 }
 616                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 617                 if (use_spnego) {
 618                         /* blob_length = build_spnego_ntlmssp_blob(
 619                                         &security_blob,
 620                                         sizeof(struct _NEGOTIATE_MESSAGE),
 621                                         ntlmssp_blob); */
 622                         /* BB eventually need to add this */
 623                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 624                         rc = -EOPNOTSUPP;
 625                         kfree(ntlmssp_blob);
 626                         goto ssetup_exit;
 627                 } else {
 628                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 629                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 630                         security_blob = ntlmssp_blob;
 631                 }
 632         } else if (phase == NtLmAuthenticate) {
 633                 req->hdr.SessionId = ses->Suid;
 634                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 635                                        GFP_KERNEL);
 636                 if (ntlmssp_blob == NULL) {
 637                         rc = -ENOMEM;
 638                         goto ssetup_exit;
 639                 }
 640                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 641                                              nls_cp);
 642                 if (rc) {
 643                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 644                                  rc);
 645                         goto ssetup_exit; /* BB double check error handling */
 646                 }
 647                 if (use_spnego) {
 648                         /* blob_length = build_spnego_ntlmssp_blob(
 649                                                         &security_blob,
 650                                                         blob_length,
 651                                                         ntlmssp_blob); */
 652                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 653                         rc = -EOPNOTSUPP;
 654                         kfree(ntlmssp_blob);
 655                         goto ssetup_exit;
 656                 } else {
 657                         security_blob = ntlmssp_blob;
 658                 }
 659         } else {
 660                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 661                 rc = -EIO;
 662                 goto ssetup_exit;
 663         }
 664
 665         /* Testing shows that buffer offset must be at location of Buffer[0] */
 666         req->SecurityBufferOffset =
 667                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 668                                             1 /* pad */ - 4 /* rfc1001 len */);
 669         req->SecurityBufferLength = cpu_to_le16(blob_length);
 670         iov[1].iov_base = security_blob;
 671         iov[1].iov_len = blob_length;
 672
 673         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 674
 675         /* BB add code to build os and lm fields */
 676
 677         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 678                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 679
 680         kfree(security_blob);
 681         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 682         if (resp_buftype != CIFS_NO_BUFFER &&
 683             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 684                 if (phase != NtLmNegotiate) {
 685                         cifs_dbg(VFS, "Unexpected more processing error\n");
 686                         goto ssetup_exit;
 687                 }
 688                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 689                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 690                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 691                                  le16_to_cpu(rsp->SecurityBufferOffset));
 692                         rc = -EIO;
 693                         goto ssetup_exit;
 694                 }
 695
 696                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 697                 phase = NtLmChallenge; /* process ntlmssp challenge */
 698                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 699                 ses->Suid = rsp->hdr.SessionId;
 700                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 701                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 702         }
 703
 704         /*
 705          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 706          * but at least the raw NTLMSSP case works.
 707          */
 708         /*
 709          * No tcon so can't do
 710          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 711          */
 712         if (rc != 0)
 713                 goto ssetup_exit;
 714
 715         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 716         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 717                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 718 ssetup_exit:
 719         free_rsp_buf(resp_buftype, rsp);
 720
 721         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 722         if ((phase == NtLmChallenge) && (rc == 0))
 723                 goto ssetup_ntlmssp_authenticate;
 724
 725         if (!rc) {
 726                 mutex_lock(&server->srv_mutex);
 727                 if (server->sign && server->ops->generate_signingkey) {
 728                         rc = server->ops->generate_signingkey(ses);
 729                         kfree(ses->auth_key.response);
 730                         ses->auth_key.response = NULL;
 731                         if (rc) {
 732                                 cifs_dbg(FYI,
 733                                         "SMB3 session key generation failed\n");
 734                                 mutex_unlock(&server->srv_mutex);
 735                                 goto keygen_exit;
 736                         }
 737                 }
 738                 if (!server->session_estab) {
 739                         server->sequence_number = 0x2;
 740                         server->session_estab = true;
 741                 }
 742                 mutex_unlock(&server->srv_mutex);
 743
 744                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 745                 spin_lock(&GlobalMid_Lock);
 746                 ses->status = CifsGood;
 747                 ses->need_reconnect = false;
 748                 spin_unlock(&GlobalMid_Lock);
 749         }
 750
 751 keygen_exit:
 752         if (!server->sign) {
 753                 kfree(ses->auth_key.response);
 754                 ses->auth_key.response = NULL;
 755         }
 756         kfree(ses->ntlmssp);
 757
 758         return rc;
 759 }
 760
 761 int
 762 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 763 {
 764         struct smb2_logoff_req *req; /* response is also trivial struct */
 765         int rc = 0;
 766         struct TCP_Server_Info *server;
 767
 768         cifs_dbg(FYI, "disconnect session %p\n", ses);
 769
 770         if (ses && (ses->server))
 771                 server = ses->server;
 772         else
 773                 return -EIO;
 774
 775         /* no need to send SMB logoff if uid already closed due to reconnect */
 776         if (ses->need_reconnect)
 777                 goto smb2_session_already_dead;
 778
 779         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 780         if (rc)
 781                 return rc;
 782
 783          /* since no tcon, smb2_init can not do this, so do here */
 784         req->hdr.SessionId = ses->Suid;
 785         if (server->sign)
 786                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 787
 788         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 789         /*
 790          * No tcon so can't do
 791          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 792          */
 793
 794 smb2_session_already_dead:
 795         return rc;
 796 }
 797
 798 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 799 {
 800         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 801 }
 802
 803 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 804
 805 /* These are similar values to what Windows uses */
 806 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 807 {
 808         tcon->max_chunks = 256;
 809         tcon->max_bytes_chunk = 1048576;
 810         tcon->max_bytes_copy = 16777216;
 811 }
 812
 813 int
 814 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 815           struct cifs_tcon *tcon, const struct nls_table *cp)
 816 {
 817         struct smb2_tree_connect_req *req;
 818         struct smb2_tree_connect_rsp *rsp = NULL;
 819         struct kvec iov[2];
 820         int rc = 0;
 821         int resp_buftype;
 822         int unc_path_len;
 823         struct TCP_Server_Info *server;
 824         __le16 *unc_path = NULL;
 825
 826         cifs_dbg(FYI, "TCON\n");
 827
 828         if ((ses->server) && tree)
 829                 server = ses->server;
 830         else
 831                 return -EIO;
 832
 833         if (tcon && tcon->bad_network_name)
 834                 return -ENOENT;
 835
 836         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 837         if (unc_path == NULL)
 838                 return -ENOMEM;
 839
 840         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 841         unc_path_len *= 2;
 842         if (unc_path_len < 2) {
 843                 kfree(unc_path);
 844                 return -EINVAL;
 845         }
 846
 847         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 848         if (rc) {
 849                 kfree(unc_path);
 850                 return rc;
 851         }
 852
 853         if (tcon == NULL) {
 854                 /* since no tcon, smb2_init can not do this, so do here */
 855                 req->hdr.SessionId = ses->Suid;
 856                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 857                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 858         }
 859
 860         iov[0].iov_base = (char *)req;
 861         /* 4 for rfc1002 length field and 1 for pad */
 862         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 863
 864         /* Testing shows that buffer offset must be at location of Buffer[0] */
 865         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 866                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 867         req->PathLength = cpu_to_le16(unc_path_len - 2);
 868         iov[1].iov_base = unc_path;
 869         iov[1].iov_len = unc_path_len;
 870
 871         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 872
 873         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 874         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 875
 876         if (rc != 0) {
 877                 if (tcon) {
 878                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 879                         tcon->need_reconnect = true;
 880                 }
 881                 goto tcon_error_exit;
 882         }
 883
 884         if (tcon == NULL) {
 885                 ses->ipc_tid = rsp->hdr.TreeId;
 886                 goto tcon_exit;
 887         }
 888
 889         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 890                 cifs_dbg(FYI, "connection to disk share\n");
 891         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 892                 tcon->ipc = true;
 893                 cifs_dbg(FYI, "connection to pipe share\n");
 894         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 895                 tcon->print = true;
 896                 cifs_dbg(FYI, "connection to printer\n");
 897         } else {
 898                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 899                 rc = -EOPNOTSUPP;
 900                 goto tcon_error_exit;
 901         }
 902
 903         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 904         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 905         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 906         tcon->tidStatus = CifsGood;
 907         tcon->need_reconnect = false;
 908         tcon->tid = rsp->hdr.TreeId;
 909         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 910
 911         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 912             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 913                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 914         init_copy_chunk_defaults(tcon);
 915         if (tcon->ses->server->ops->validate_negotiate)
 916                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 917 tcon_exit:
 918         free_rsp_buf(resp_buftype, rsp);
 919         kfree(unc_path);
 920         return rc;
 921
 922 tcon_error_exit:
 923         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 924                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 925                 tcon->bad_network_name = true;
 926         }
 927         goto tcon_exit;
 928 }
 929
 930 int
 931 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 932 {
 933         struct smb2_tree_disconnect_req *req; /* response is trivial */
 934         int rc = 0;
 935         struct TCP_Server_Info *server;
 936         struct cifs_ses *ses = tcon->ses;
 937
 938         cifs_dbg(FYI, "Tree Disconnect\n");
 939
 940         if (ses && (ses->server))
 941                 server = ses->server;
 942         else
 943                 return -EIO;
 944
 945         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 946                 return 0;
 947
 948         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 949         if (rc)
 950                 return rc;
 951
 952         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 953         if (rc)
 954                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 955
 956         return rc;
 957 }
 958
 959
 960 static struct create_durable *
 961 create_durable_buf(void)
 962 {
 963         struct create_durable *buf;
 964
 965         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 966         if (!buf)
 967                 return NULL;
 968
 969         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 970                                         (struct create_durable, Data));
 971         buf->ccontext.DataLength = cpu_to_le32(16);
 972         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 973                                 (struct create_durable, Name));
 974         buf->ccontext.NameLength = cpu_to_le16(4);
 975         buf->Name[0] = 'D';
 976         buf->Name[1] = 'H';
 977         buf->Name[2] = 'n';
 978         buf->Name[3] = 'Q';
 979         return buf;
 980 }
 981
 982 static struct create_durable *
 983 create_reconnect_durable_buf(struct cifs_fid *fid)
 984 {
 985         struct create_durable *buf;
 986
 987         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 988         if (!buf)
 989                 return NULL;
 990
 991         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 992                                         (struct create_durable, Data));
 993         buf->ccontext.DataLength = cpu_to_le32(16);
 994         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 995                                 (struct create_durable, Name));
 996         buf->ccontext.NameLength = cpu_to_le16(4);
 997         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 998         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 999         buf->Name[0] = 'D';
1000         buf->Name[1] = 'H';
1001         buf->Name[2] = 'n';
1002         buf->Name[3] = 'C';
1003         return buf;
1004 }
1005
1006 static __u8
1007 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1008                   unsigned int *epoch)
1009 {
1010         char *data_offset;
1011         struct create_context *cc;
1012         unsigned int next = 0;
1013         char *name;
1014
1015         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1016         cc = (struct create_context *)data_offset;
1017         do {
1018                 cc = (struct create_context *)((char *)cc + next);
1019                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1020                 if (le16_to_cpu(cc->NameLength) != 4 ||
1021                     strncmp(name, "RqLs", 4)) {
1022                         next = le32_to_cpu(cc->Next);
1023                         continue;
1024                 }
1025                 return server->ops->parse_lease_buf(cc, epoch);
1026         } while (next != 0);
1027
1028         return 0;
1029 }
1030
1031 static int
1032 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1033                   unsigned int *num_iovec, __u8 *oplock)
1034 {
1035         struct smb2_create_req *req = iov[0].iov_base;
1036         unsigned int num = *num_iovec;
1037
1038         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1039         if (iov[num].iov_base == NULL)
1040                 return -ENOMEM;
1041         iov[num].iov_len = server->vals->create_lease_size;
1042         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1043         if (!req->CreateContextsOffset)
1044                 req->CreateContextsOffset = cpu_to_le32(
1045                                 sizeof(struct smb2_create_req) - 4 +
1046                                 iov[num - 1].iov_len);
1047         le32_add_cpu(&req->CreateContextsLength,
1048                      server->vals->create_lease_size);
1049         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1050         *num_iovec = num + 1;
1051         return 0;
1052 }
1053
1054 static int
1055 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1056                     struct cifs_open_parms *oparms)
1057 {
1058         struct smb2_create_req *req = iov[0].iov_base;
1059         unsigned int num = *num_iovec;
1060
1061         if (oparms->reconnect) {
1062                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1063                 /* indicate that we don't need to relock the file */
1064                 oparms->reconnect = false;
1065         } else
1066                 iov[num].iov_base = create_durable_buf();
1067         if (iov[num].iov_base == NULL)
1068                 return -ENOMEM;
1069         iov[num].iov_len = sizeof(struct create_durable);
1070         if (!req->CreateContextsOffset)
1071                 req->CreateContextsOffset =
1072                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1073                                                                 iov[1].iov_len);
1074         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1075         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1076         *num_iovec = num + 1;
1077         return 0;
1078 }
1079
1080 int
1081 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1082           __u8 *oplock, struct smb2_file_all_info *buf,
1083           struct smb2_err_rsp **err_buf)
1084 {
1085         struct smb2_create_req *req;
1086         struct smb2_create_rsp *rsp;
1087         struct TCP_Server_Info *server;
1088         struct cifs_tcon *tcon = oparms->tcon;
1089         struct cifs_ses *ses = tcon->ses;
1090         struct kvec iov[4];
1091         int resp_buftype;
1092         int uni_path_len;
1093         __le16 *copy_path = NULL;
1094         int copy_size;
1095         int rc = 0;
1096         unsigned int num_iovecs = 2;
1097         __u32 file_attributes = 0;
1098
1099         cifs_dbg(FYI, "create/open\n");
1100
1101         if (ses && (ses->server))
1102                 server = ses->server;
1103         else
1104                 return -EIO;
1105
1106         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1107         if (rc)
1108                 return rc;
1109
1110         if (oparms->create_options & CREATE_OPTION_READONLY)
1111                 file_attributes |= ATTR_READONLY;
1112
1113         req->ImpersonationLevel = IL_IMPERSONATION;
1114         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1115         /* File attributes ignored on open (used in create though) */
1116         req->FileAttributes = cpu_to_le32(file_attributes);
1117         req->ShareAccess = FILE_SHARE_ALL_LE;
1118         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1119         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1120         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1121         /* do not count rfc1001 len field */
1122         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1123
1124         iov[0].iov_base = (char *)req;
1125         /* 4 for rfc1002 length field */
1126         iov[0].iov_len = get_rfc1002_length(req) + 4;
1127
1128         /* MUST set path len (NameLength) to 0 opening root of share */
1129         req->NameLength = cpu_to_le16(uni_path_len - 2);
1130         /* -1 since last byte is buf[0] which is sent below (path) */
1131         iov[0].iov_len--;
1132         if (uni_path_len % 8 != 0) {
1133                 copy_size = uni_path_len / 8 * 8;
1134                 if (copy_size < uni_path_len)
1135                         copy_size += 8;
1136
1137                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1138                 if (!copy_path)
1139                         return -ENOMEM;
1140                 memcpy((char *)copy_path, (const char *)path,
1141                         uni_path_len);
1142                 uni_path_len = copy_size;
1143                 path = copy_path;
1144         }
1145
1146         iov[1].iov_len = uni_path_len;
1147         iov[1].iov_base = path;
1148         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1149         inc_rfc1001_len(req, uni_path_len - 1);
1150
1151         if (!server->oplocks)
1152                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1153
1154         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1155             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1156                 req->RequestedOplockLevel = *oplock;
1157         else {
1158                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1159                 if (rc) {
1160                         cifs_small_buf_release(req);
1161                         kfree(copy_path);
1162                         return rc;
1163                 }
1164         }
1165
1166         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1167                 /* need to set Next field of lease context if we request it */
1168                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1169                         struct create_context *ccontext =
1170                             (struct create_context *)iov[num_iovecs-1].iov_base;
1171                         ccontext->Next =
1172                                 cpu_to_le32(server->vals->create_lease_size);
1173                 }
1174                 rc = add_durable_context(iov, &num_iovecs, oparms);
1175                 if (rc) {
1176                         cifs_small_buf_release(req);
1177                         kfree(copy_path);
1178                         kfree(iov[num_iovecs-1].iov_base);
1179                         return rc;
1180                 }
1181         }
1182
1183         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1184         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1185
1186         if (rc != 0) {
1187                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1188                 if (err_buf)
1189                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1190                                            GFP_KERNEL);
1191                 goto creat_exit;
1192         }
1193
1194         oparms->fid->persistent_fid = rsp->PersistentFileId;
1195         oparms->fid->volatile_fid = rsp->VolatileFileId;
1196
1197         if (buf) {
1198                 memcpy(buf, &rsp->CreationTime, 32);
1199                 buf->AllocationSize = rsp->AllocationSize;
1200                 buf->EndOfFile = rsp->EndofFile;
1201                 buf->Attributes = rsp->FileAttributes;
1202                 buf->NumberOfLinks = cpu_to_le32(1);
1203                 buf->DeletePending = 0;
1204         }
1205
1206         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1207                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1208         else
1209                 *oplock = rsp->OplockLevel;
1210 creat_exit:
1211         kfree(copy_path);
1212         free_rsp_buf(resp_buftype, rsp);
1213         return rc;
1214 }
1215
1216 /*
1217  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1218  */
1219 int
1220 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1221            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1222            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1223 {
1224         struct smb2_ioctl_req *req;
1225         struct smb2_ioctl_rsp *rsp;
1226         struct TCP_Server_Info *server;
1227         struct cifs_ses *ses = tcon->ses;
1228         struct kvec iov[2];
1229         int resp_buftype;
1230         int num_iovecs;
1231         int rc = 0;
1232
1233         cifs_dbg(FYI, "SMB2 IOCTL\n");
1234
1235         *out_data = NULL;
1236         /* zero out returned data len, in case of error */
1237         if (plen)
1238                 *plen = 0;
1239
1240         if (ses && (ses->server))
1241                 server = ses->server;
1242         else
1243                 return -EIO;
1244
1245         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1246         if (rc)
1247                 return rc;
1248
1249         req->CtlCode = cpu_to_le32(opcode);
1250         req->PersistentFileId = persistent_fid;
1251         req->VolatileFileId = volatile_fid;
1252
1253         if (indatalen) {
1254                 req->InputCount = cpu_to_le32(indatalen);
1255                 /* do not set InputOffset if no input data */
1256                 req->InputOffset =
1257                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1258                 iov[1].iov_base = in_data;
1259                 iov[1].iov_len = indatalen;
1260                 num_iovecs = 2;
1261         } else
1262                 num_iovecs = 1;
1263
1264         req->OutputOffset = 0;
1265         req->OutputCount = 0; /* MBZ */
1266
1267         /*
1268          * Could increase MaxOutputResponse, but that would require more
1269          * than one credit. Windows typically sets this smaller, but for some
1270          * ioctls it may be useful to allow server to send more. No point
1271          * limiting what the server can send as long as fits in one credit
1272          */
1273         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1274
1275         if (is_fsctl)
1276                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1277         else
1278                 req->Flags = 0;
1279
1280         iov[0].iov_base = (char *)req;
1281
1282         /*
1283          * If no input data, the size of ioctl struct in
1284          * protocol spec still includes a 1 byte data buffer,
1285          * but if input data passed to ioctl, we do not
1286          * want to double count this, so we do not send
1287          * the dummy one byte of data in iovec[0] if sending
1288          * input data (in iovec[1]). We also must add 4 bytes
1289          * in first iovec to allow for rfc1002 length field.
1290          */
1291
1292         if (indatalen) {
1293                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1294                 inc_rfc1001_len(req, indatalen - 1);
1295         } else
1296                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1297
1298
1299         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1300         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1301
1302         if ((rc != 0) && (rc != -EINVAL)) {
1303                 if (tcon)
1304                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1305                 goto ioctl_exit;
1306         } else if (rc == -EINVAL) {
1307                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1308                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1309                         if (tcon)
1310                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1311                         goto ioctl_exit;
1312                 }
1313         }
1314
1315         /* check if caller wants to look at return data or just return rc */
1316         if ((plen == NULL) || (out_data == NULL))
1317                 goto ioctl_exit;
1318
1319         *plen = le32_to_cpu(rsp->OutputCount);
1320
1321         /* We check for obvious errors in the output buffer length and offset */
1322         if (*plen == 0)
1323                 goto ioctl_exit; /* server returned no data */
1324         else if (*plen > 0xFF00) {
1325                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1326                 *plen = 0;
1327                 rc = -EIO;
1328                 goto ioctl_exit;
1329         }
1330
1331         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1332                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1333                         le32_to_cpu(rsp->OutputOffset));
1334                 *plen = 0;
1335                 rc = -EIO;
1336                 goto ioctl_exit;
1337         }
1338
1339         *out_data = kmalloc(*plen, GFP_KERNEL);
1340         if (*out_data == NULL) {
1341                 rc = -ENOMEM;
1342                 goto ioctl_exit;
1343         }
1344
1345         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1346                *plen);
1347 ioctl_exit:
1348         free_rsp_buf(resp_buftype, rsp);
1349         return rc;
1350 }
1351
1352 /*
1353  *   Individual callers to ioctl worker function follow
1354  */
1355
1356 int
1357 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1358                      u64 persistent_fid, u64 volatile_fid)
1359 {
1360         int rc;
1361         struct  compress_ioctl fsctl_input;
1362         char *ret_data = NULL;
1363
1364         fsctl_input.CompressionState =
1365                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1366
1367         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1368                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1369                         (char *)&fsctl_input /* data input */,
1370                         2 /* in data len */, &ret_data /* out data */, NULL);
1371
1372         cifs_dbg(FYI, "set compression rc %d\n", rc);
1373
1374         return rc;
1375 }
1376
1377 int
1378 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1379            u64 persistent_fid, u64 volatile_fid)
1380 {
1381         struct smb2_close_req *req;
1382         struct smb2_close_rsp *rsp;
1383         struct TCP_Server_Info *server;
1384         struct cifs_ses *ses = tcon->ses;
1385         struct kvec iov[1];
1386         int resp_buftype;
1387         int rc = 0;
1388
1389         cifs_dbg(FYI, "Close\n");
1390
1391         if (ses && (ses->server))
1392                 server = ses->server;
1393         else
1394                 return -EIO;
1395
1396         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1397         if (rc)
1398                 return rc;
1399
1400         req->PersistentFileId = persistent_fid;
1401         req->VolatileFileId = volatile_fid;
1402
1403         iov[0].iov_base = (char *)req;
1404         /* 4 for rfc1002 length field */
1405         iov[0].iov_len = get_rfc1002_length(req) + 4;
1406
1407         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1408         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1409
1410         if (rc != 0) {
1411                 if (tcon)
1412                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1413                 goto close_exit;
1414         }
1415
1416         /* BB FIXME - decode close response, update inode for caching */
1417
1418 close_exit:
1419         free_rsp_buf(resp_buftype, rsp);
1420         return rc;
1421 }
1422
1423 static int
1424 validate_buf(unsigned int offset, unsigned int buffer_length,
1425              struct smb2_hdr *hdr, unsigned int min_buf_size)
1426
1427 {
1428         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1429         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1430         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1431         char *end_of_buf = begin_of_buf + buffer_length;
1432
1433
1434         if (buffer_length < min_buf_size) {
1435                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1436                          buffer_length, min_buf_size);
1437                 return -EINVAL;
1438         }
1439
1440         /* check if beyond RFC1001 maximum length */
1441         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1442                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1443                          buffer_length, smb_len);
1444                 return -EINVAL;
1445         }
1446
1447         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1448                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1449                 return -EINVAL;
1450         }
1451
1452         return 0;
1453 }
1454
1455 /*
1456  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1457  * Caller must free buffer.
1458  */
1459 static int
1460 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1461                       struct smb2_hdr *hdr, unsigned int minbufsize,
1462                       char *data)
1463
1464 {
1465         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1466         int rc;
1467
1468         if (!data)
1469                 return -EINVAL;
1470
1471         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1472         if (rc)
1473                 return rc;
1474
1475         memcpy(data, begin_of_buf, buffer_length);
1476
1477         return 0;
1478 }
1479
1480 static int
1481 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1482            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1483            size_t output_len, size_t min_len, void *data)
1484 {
1485         struct smb2_query_info_req *req;
1486         struct smb2_query_info_rsp *rsp = NULL;
1487         struct kvec iov[2];
1488         int rc = 0;
1489         int resp_buftype;
1490         struct TCP_Server_Info *server;
1491         struct cifs_ses *ses = tcon->ses;
1492
1493         cifs_dbg(FYI, "Query Info\n");
1494
1495         if (ses && (ses->server))
1496                 server = ses->server;
1497         else
1498                 return -EIO;
1499
1500         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1501         if (rc)
1502                 return rc;
1503
1504         req->InfoType = SMB2_O_INFO_FILE;
1505         req->FileInfoClass = info_class;
1506         req->PersistentFileId = persistent_fid;
1507         req->VolatileFileId = volatile_fid;
1508         /* 4 for rfc1002 length field and 1 for Buffer */
1509         req->InputBufferOffset =
1510                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1511         req->OutputBufferLength = cpu_to_le32(output_len);
1512
1513         iov[0].iov_base = (char *)req;
1514         /* 4 for rfc1002 length field */
1515         iov[0].iov_len = get_rfc1002_length(req) + 4;
1516
1517         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1518         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1519
1520         if (rc) {
1521                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1522                 goto qinf_exit;
1523         }
1524
1525         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1526                                    le32_to_cpu(rsp->OutputBufferLength),
1527                                    &rsp->hdr, min_len, data);
1528
1529 qinf_exit:
1530         free_rsp_buf(resp_buftype, rsp);
1531         return rc;
1532 }
1533
1534 int
1535 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1536                 u64 persistent_fid, u64 volatile_fid,
1537                 struct smb2_file_all_info *data)
1538 {
1539         return query_info(xid, tcon, persistent_fid, volatile_fid,
1540                           FILE_ALL_INFORMATION,
1541                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1542                           sizeof(struct smb2_file_all_info), data);
1543 }
1544
1545 int
1546 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1547                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1548 {
1549         return query_info(xid, tcon, persistent_fid, volatile_fid,
1550                           FILE_INTERNAL_INFORMATION,
1551                           sizeof(struct smb2_file_internal_info),
1552                           sizeof(struct smb2_file_internal_info), uniqueid);
1553 }
1554
1555 /*
1556  * This is a no-op for now. We're not really interested in the reply, but
1557  * rather in the fact that the server sent one and that server->lstrp
1558  * gets updated.
1559  *
1560  * FIXME: maybe we should consider checking that the reply matches request?
1561  */
1562 static void
1563 smb2_echo_callback(struct mid_q_entry *mid)
1564 {
1565         struct TCP_Server_Info *server = mid->callback_data;
1566         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1567         unsigned int credits_received = 1;
1568
1569         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1570                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1571
1572         DeleteMidQEntry(mid);
1573         add_credits(server, credits_received, CIFS_ECHO_OP);
1574 }
1575
1576 int
1577 SMB2_echo(struct TCP_Server_Info *server)
1578 {
1579         struct smb2_echo_req *req;
1580         int rc = 0;
1581         struct kvec iov;
1582         struct smb_rqst rqst = { .rq_iov = &iov,
1583                                  .rq_nvec = 1 };
1584
1585         cifs_dbg(FYI, "In echo request\n");
1586
1587         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1588         if (rc)
1589                 return rc;
1590
1591         req->hdr.CreditRequest = cpu_to_le16(1);
1592
1593         iov.iov_base = (char *)req;
1594         /* 4 for rfc1002 length field */
1595         iov.iov_len = get_rfc1002_length(req) + 4;
1596
1597         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1598                              CIFS_ECHO_OP);
1599         if (rc)
1600                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1601
1602         cifs_small_buf_release(req);
1603         return rc;
1604 }
1605
1606 int
1607 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1608            u64 volatile_fid)
1609 {
1610         struct smb2_flush_req *req;
1611         struct TCP_Server_Info *server;
1612         struct cifs_ses *ses = tcon->ses;
1613         struct kvec iov[1];
1614         int resp_buftype;
1615         int rc = 0;
1616
1617         cifs_dbg(FYI, "Flush\n");
1618
1619         if (ses && (ses->server))
1620                 server = ses->server;
1621         else
1622                 return -EIO;
1623
1624         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1625         if (rc)
1626                 return rc;
1627
1628         req->PersistentFileId = persistent_fid;
1629         req->VolatileFileId = volatile_fid;
1630
1631         iov[0].iov_base = (char *)req;
1632         /* 4 for rfc1002 length field */
1633         iov[0].iov_len = get_rfc1002_length(req) + 4;
1634
1635         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1636
1637         if ((rc != 0) && tcon)
1638                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1639
1640         free_rsp_buf(resp_buftype, iov[0].iov_base);
1641         return rc;
1642 }
1643
1644 /*
1645  * To form a chain of read requests, any read requests after the first should
1646  * have the end_of_chain boolean set to true.
1647  */
1648 static int
1649 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1650                   unsigned int remaining_bytes, int request_type)
1651 {
1652         int rc = -EACCES;
1653         struct smb2_read_req *req = NULL;
1654
1655         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1656         if (rc)
1657                 return rc;
1658         if (io_parms->tcon->ses->server == NULL)
1659                 return -ECONNABORTED;
1660
1661         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1662
1663         req->PersistentFileId = io_parms->persistent_fid;
1664         req->VolatileFileId = io_parms->volatile_fid;
1665         req->ReadChannelInfoOffset = 0; /* reserved */
1666         req->ReadChannelInfoLength = 0; /* reserved */
1667         req->Channel = 0; /* reserved */
1668         req->MinimumCount = 0;
1669         req->Length = cpu_to_le32(io_parms->length);
1670         req->Offset = cpu_to_le64(io_parms->offset);
1671
1672         if (request_type & CHAINED_REQUEST) {
1673                 if (!(request_type & END_OF_CHAIN)) {
1674                         /* 4 for rfc1002 length field */
1675                         req->hdr.NextCommand =
1676                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1677                 } else /* END_OF_CHAIN */
1678                         req->hdr.NextCommand = 0;
1679                 if (request_type & RELATED_REQUEST) {
1680                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1681                         /*
1682                          * Related requests use info from previous read request
1683                          * in chain.
1684                          */
1685                         req->hdr.SessionId = 0xFFFFFFFF;
1686                         req->hdr.TreeId = 0xFFFFFFFF;
1687                         req->PersistentFileId = 0xFFFFFFFF;
1688                         req->VolatileFileId = 0xFFFFFFFF;
1689                 }
1690         }
1691         if (remaining_bytes > io_parms->length)
1692                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1693         else
1694                 req->RemainingBytes = 0;
1695
1696         iov[0].iov_base = (char *)req;
1697         /* 4 for rfc1002 length field */
1698         iov[0].iov_len = get_rfc1002_length(req) + 4;
1699         return rc;
1700 }
1701
1702 static void
1703 smb2_readv_callback(struct mid_q_entry *mid)
1704 {
1705         struct cifs_readdata *rdata = mid->callback_data;
1706         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1707         struct TCP_Server_Info *server = tcon->ses->server;
1708         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1709         unsigned int credits_received = 1;
1710         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1711                                  .rq_nvec = 1,
1712                                  .rq_pages = rdata->pages,
1713                                  .rq_npages = rdata->nr_pages,
1714                                  .rq_pagesz = rdata->pagesz,
1715                                  .rq_tailsz = rdata->tailsz };
1716
1717         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1718                  __func__, mid->mid, mid->mid_state, rdata->result,
1719                  rdata->bytes);
1720
1721         switch (mid->mid_state) {
1722         case MID_RESPONSE_RECEIVED:
1723                 credits_received = le16_to_cpu(buf->CreditRequest);
1724                 /* result already set, check signature */
1725                 if (server->sign) {
1726                         int rc;
1727
1728                         rc = smb2_verify_signature(&rqst, server);
1729                         if (rc)
1730                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1731                                          rc);
1732                 }
1733                 /* FIXME: should this be counted toward the initiating task? */
1734                 task_io_account_read(rdata->bytes);
1735                 cifs_stats_bytes_read(tcon, rdata->bytes);
1736                 break;
1737         case MID_REQUEST_SUBMITTED:
1738         case MID_RETRY_NEEDED:
1739                 rdata->result = -EAGAIN;
1740                 break;
1741         default:
1742                 if (rdata->result != -ENODATA)
1743                         rdata->result = -EIO;
1744         }
1745
1746         if (rdata->result)
1747                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1748
1749         queue_work(cifsiod_wq, &rdata->work);
1750         DeleteMidQEntry(mid);
1751         add_credits(server, credits_received, 0);
1752 }
1753
1754 /* smb2_async_readv - send an async write, and set up mid to handle result */
1755 int
1756 smb2_async_readv(struct cifs_readdata *rdata)
1757 {
1758         int rc;
1759         struct smb2_hdr *buf;
1760         struct cifs_io_parms io_parms;
1761         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1762                                  .rq_nvec = 1 };
1763
1764         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1765                  __func__, rdata->offset, rdata->bytes);
1766
1767         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1768         io_parms.offset = rdata->offset;
1769         io_parms.length = rdata->bytes;
1770         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1771         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1772         io_parms.pid = rdata->pid;
1773         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1774         if (rc)
1775                 return rc;
1776
1777         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1778         /* 4 for rfc1002 length field */
1779         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1780
1781         kref_get(&rdata->refcount);
1782         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1783                              cifs_readv_receive, smb2_readv_callback,
1784                              rdata, 0);
1785         if (rc) {
1786                 kref_put(&rdata->refcount, cifs_readdata_release);
1787                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1788         }
1789
1790         cifs_small_buf_release(buf);
1791         return rc;
1792 }
1793
1794 int
1795 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1796           unsigned int *nbytes, char **buf, int *buf_type)
1797 {
1798         int resp_buftype, rc = -EACCES;
1799         struct smb2_read_rsp *rsp = NULL;
1800         struct kvec iov[1];
1801
1802         *nbytes = 0;
1803         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1804         if (rc)
1805                 return rc;
1806
1807         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1808                           &resp_buftype, CIFS_LOG_ERROR);
1809
1810         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1811
1812         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1813                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1814                 return 0;
1815         }
1816
1817         if (rc) {
1818                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1819                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1820         } else {
1821                 *nbytes = le32_to_cpu(rsp->DataLength);
1822                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1823                     (*nbytes > io_parms->length)) {
1824                         cifs_dbg(FYI, "bad length %d for count %d\n",
1825                                  *nbytes, io_parms->length);
1826                         rc = -EIO;
1827                         *nbytes = 0;
1828                 }
1829         }
1830
1831         if (*buf) {
1832                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1833                        *nbytes);
1834                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1835         } else if (resp_buftype != CIFS_NO_BUFFER) {
1836                 *buf = iov[0].iov_base;
1837                 if (resp_buftype == CIFS_SMALL_BUFFER)
1838                         *buf_type = CIFS_SMALL_BUFFER;
1839                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1840                         *buf_type = CIFS_LARGE_BUFFER;
1841         }
1842         return rc;
1843 }
1844
1845 /*
1846  * Check the mid_state and signature on received buffer (if any), and queue the
1847  * workqueue completion task.
1848  */
1849 static void
1850 smb2_writev_callback(struct mid_q_entry *mid)
1851 {
1852         struct cifs_writedata *wdata = mid->callback_data;
1853         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1854         unsigned int written;
1855         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1856         unsigned int credits_received = 1;
1857
1858         switch (mid->mid_state) {
1859         case MID_RESPONSE_RECEIVED:
1860                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1861                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1862                 if (wdata->result != 0)
1863                         break;
1864
1865                 written = le32_to_cpu(rsp->DataLength);
1866                 /*
1867                  * Mask off high 16 bits when bytes written as returned
1868                  * by the server is greater than bytes requested by the
1869                  * client. OS/2 servers are known to set incorrect
1870                  * CountHigh values.
1871                  */
1872                 if (written > wdata->bytes)
1873                         written &= 0xFFFF;
1874
1875                 if (written < wdata->bytes)
1876                         wdata->result = -ENOSPC;
1877                 else
1878                         wdata->bytes = written;
1879                 break;
1880         case MID_REQUEST_SUBMITTED:
1881         case MID_RETRY_NEEDED:
1882                 wdata->result = -EAGAIN;
1883                 break;
1884         default:
1885                 wdata->result = -EIO;
1886                 break;
1887         }
1888
1889         if (wdata->result)
1890                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1891
1892         queue_work(cifsiod_wq, &wdata->work);
1893         DeleteMidQEntry(mid);
1894         add_credits(tcon->ses->server, credits_received, 0);
1895 }
1896
1897 /* smb2_async_writev - send an async write, and set up mid to handle result */
1898 int
1899 smb2_async_writev(struct cifs_writedata *wdata,
1900                   void (*release)(struct kref *kref))
1901 {
1902         int rc = -EACCES;
1903         struct smb2_write_req *req = NULL;
1904         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1905         struct kvec iov;
1906         struct smb_rqst rqst;
1907
1908         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1909         if (rc)
1910                 goto async_writev_out;
1911
1912         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1913
1914         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1915         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1916         req->WriteChannelInfoOffset = 0;
1917         req->WriteChannelInfoLength = 0;
1918         req->Channel = 0;
1919         req->Offset = cpu_to_le64(wdata->offset);
1920         /* 4 for rfc1002 length field */
1921         req->DataOffset = cpu_to_le16(
1922                                 offsetof(struct smb2_write_req, Buffer) - 4);
1923         req->RemainingBytes = 0;
1924
1925         /* 4 for rfc1002 length field and 1 for Buffer */
1926         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1927         iov.iov_base = req;
1928
1929         rqst.rq_iov = &iov;
1930         rqst.rq_nvec = 1;
1931         rqst.rq_pages = wdata->pages;
1932         rqst.rq_npages = wdata->nr_pages;
1933         rqst.rq_pagesz = wdata->pagesz;
1934         rqst.rq_tailsz = wdata->tailsz;
1935
1936         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1937                  wdata->offset, wdata->bytes);
1938
1939         req->Length = cpu_to_le32(wdata->bytes);
1940
1941         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1942
1943         kref_get(&wdata->refcount);
1944         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1945                                 smb2_writev_callback, wdata, 0);
1946
1947         if (rc) {
1948                 kref_put(&wdata->refcount, release);
1949                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1950         }
1951
1952 async_writev_out:
1953         cifs_small_buf_release(req);
1954         return rc;
1955 }
1956
1957 /*
1958  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1959  * The length field from io_parms must be at least 1 and indicates a number of
1960  * elements with data to write that begins with position 1 in iov array. All
1961  * data length is specified by count.
1962  */
1963 int
1964 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1965            unsigned int *nbytes, struct kvec *iov, int n_vec)
1966 {
1967         int rc = 0;
1968         struct smb2_write_req *req = NULL;
1969         struct smb2_write_rsp *rsp = NULL;
1970         int resp_buftype;
1971         *nbytes = 0;
1972
1973         if (n_vec < 1)
1974                 return rc;
1975
1976         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1977         if (rc)
1978                 return rc;
1979
1980         if (io_parms->tcon->ses->server == NULL)
1981                 return -ECONNABORTED;
1982
1983         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1984
1985         req->PersistentFileId = io_parms->persistent_fid;
1986         req->VolatileFileId = io_parms->volatile_fid;
1987         req->WriteChannelInfoOffset = 0;
1988         req->WriteChannelInfoLength = 0;
1989         req->Channel = 0;
1990         req->Length = cpu_to_le32(io_parms->length);
1991         req->Offset = cpu_to_le64(io_parms->offset);
1992         /* 4 for rfc1002 length field */
1993         req->DataOffset = cpu_to_le16(
1994                                 offsetof(struct smb2_write_req, Buffer) - 4);
1995         req->RemainingBytes = 0;
1996
1997         iov[0].iov_base = (char *)req;
1998         /* 4 for rfc1002 length field and 1 for Buffer */
1999         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2000
2001         /* length of entire message including data to be written */
2002         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2003
2004         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2005                           &resp_buftype, 0);
2006         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2007
2008         if (rc) {
2009                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2010                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2011         } else
2012                 *nbytes = le32_to_cpu(rsp->DataLength);
2013
2014         free_rsp_buf(resp_buftype, rsp);
2015         return rc;
2016 }
2017
2018 static unsigned int
2019 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2020 {
2021         int len;
2022         unsigned int entrycount = 0;
2023         unsigned int next_offset = 0;
2024         FILE_DIRECTORY_INFO *entryptr;
2025
2026         if (bufstart == NULL)
2027                 return 0;
2028
2029         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2030
2031         while (1) {
2032                 entryptr = (FILE_DIRECTORY_INFO *)
2033                                         ((char *)entryptr + next_offset);
2034
2035                 if ((char *)entryptr + size > end_of_buf) {
2036                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2037                         break;
2038                 }
2039
2040                 len = le32_to_cpu(entryptr->FileNameLength);
2041                 if ((char *)entryptr + len + size > end_of_buf) {
2042                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2043                                  end_of_buf);
2044                         break;
2045                 }
2046
2047                 *lastentry = (char *)entryptr;
2048                 entrycount++;
2049
2050                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2051                 if (!next_offset)
2052                         break;
2053         }
2054
2055         return entrycount;
2056 }
2057
2058 /*
2059  * Readdir/FindFirst
2060  */
2061 int
2062 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2063                      u64 persistent_fid, u64 volatile_fid, int index,
2064                      struct cifs_search_info *srch_inf)
2065 {
2066         struct smb2_query_directory_req *req;
2067         struct smb2_query_directory_rsp *rsp = NULL;
2068         struct kvec iov[2];
2069         int rc = 0;
2070         int len;
2071         int resp_buftype;
2072         unsigned char *bufptr;
2073         struct TCP_Server_Info *server;
2074         struct cifs_ses *ses = tcon->ses;
2075         __le16 asteriks = cpu_to_le16('*');
2076         char *end_of_smb;
2077         unsigned int output_size = CIFSMaxBufSize;
2078         size_t info_buf_size;
2079
2080         if (ses && (ses->server))
2081                 server = ses->server;
2082         else
2083                 return -EIO;
2084
2085         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2086         if (rc)
2087                 return rc;
2088
2089         switch (srch_inf->info_level) {
2090         case SMB_FIND_FILE_DIRECTORY_INFO:
2091                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2092                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2093                 break;
2094         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2095                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2096                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2097                 break;
2098         default:
2099                 cifs_dbg(VFS, "info level %u isn't supported\n",
2100                          srch_inf->info_level);
2101                 rc = -EINVAL;
2102                 goto qdir_exit;
2103         }
2104
2105         req->FileIndex = cpu_to_le32(index);
2106         req->PersistentFileId = persistent_fid;
2107         req->VolatileFileId = volatile_fid;
2108
2109         len = 0x2;
2110         bufptr = req->Buffer;
2111         memcpy(bufptr, &asteriks, len);
2112
2113         req->FileNameOffset =
2114                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2115         req->FileNameLength = cpu_to_le16(len);
2116         /*
2117          * BB could be 30 bytes or so longer if we used SMB2 specific
2118          * buffer lengths, but this is safe and close enough.
2119          */
2120         output_size = min_t(unsigned int, output_size, server->maxBuf);
2121         output_size = min_t(unsigned int, output_size, 2 << 15);
2122         req->OutputBufferLength = cpu_to_le32(output_size);
2123
2124         iov[0].iov_base = (char *)req;
2125         /* 4 for RFC1001 length and 1 for Buffer */
2126         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2127
2128         iov[1].iov_base = (char *)(req->Buffer);
2129         iov[1].iov_len = len;
2130
2131         inc_rfc1001_len(req, len - 1 /* Buffer */);
2132
2133         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2134         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2135
2136         if (rc) {
2137                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2138                 goto qdir_exit;
2139         }
2140
2141         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2142                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2143                           info_buf_size);
2144         if (rc)
2145                 goto qdir_exit;
2146
2147         srch_inf->unicode = true;
2148
2149         if (srch_inf->ntwrk_buf_start) {
2150                 if (srch_inf->smallBuf)
2151                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2152                 else
2153                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2154         }
2155         srch_inf->ntwrk_buf_start = (char *)rsp;
2156         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2157                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2158         /* 4 for rfc1002 length field */
2159         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2160         srch_inf->entries_in_buffer =
2161                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2162                                     &srch_inf->last_entry, info_buf_size);
2163         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2164         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2165                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2166                  srch_inf->srch_entries_start, srch_inf->last_entry);
2167         if (resp_buftype == CIFS_LARGE_BUFFER)
2168                 srch_inf->smallBuf = false;
2169         else if (resp_buftype == CIFS_SMALL_BUFFER)
2170                 srch_inf->smallBuf = true;
2171         else
2172                 cifs_dbg(VFS, "illegal search buffer type\n");
2173
2174         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2175                 srch_inf->endOfSearch = 1;
2176         else
2177                 srch_inf->endOfSearch = 0;
2178
2179         return rc;
2180
2181 qdir_exit:
2182         free_rsp_buf(resp_buftype, rsp);
2183         return rc;
2184 }
2185
2186 static int
2187 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2188                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2189                unsigned int num, void **data, unsigned int *size)
2190 {
2191         struct smb2_set_info_req *req;
2192         struct smb2_set_info_rsp *rsp = NULL;
2193         struct kvec *iov;
2194         int rc = 0;
2195         int resp_buftype;
2196         unsigned int i;
2197         struct TCP_Server_Info *server;
2198         struct cifs_ses *ses = tcon->ses;
2199
2200         if (ses && (ses->server))
2201                 server = ses->server;
2202         else
2203                 return -EIO;
2204
2205         if (!num)
2206                 return -EINVAL;
2207
2208         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2209         if (!iov)
2210                 return -ENOMEM;
2211
2212         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2213         if (rc) {
2214                 kfree(iov);
2215                 return rc;
2216         }
2217
2218         req->hdr.ProcessId = cpu_to_le32(pid);
2219
2220         req->InfoType = SMB2_O_INFO_FILE;
2221         req->FileInfoClass = info_class;
2222         req->PersistentFileId = persistent_fid;
2223         req->VolatileFileId = volatile_fid;
2224
2225         /* 4 for RFC1001 length and 1 for Buffer */
2226         req->BufferOffset =
2227                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2228         req->BufferLength = cpu_to_le32(*size);
2229
2230         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2231
2232         memcpy(req->Buffer, *data, *size);
2233
2234         iov[0].iov_base = (char *)req;
2235         /* 4 for RFC1001 length */
2236         iov[0].iov_len = get_rfc1002_length(req) + 4;
2237
2238         for (i = 1; i < num; i++) {
2239                 inc_rfc1001_len(req, size[i]);
2240                 le32_add_cpu(&req->BufferLength, size[i]);
2241                 iov[i].iov_base = (char *)data[i];
2242                 iov[i].iov_len = size[i];
2243         }
2244
2245         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2246         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2247
2248         if (rc != 0)
2249                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2250
2251         free_rsp_buf(resp_buftype, rsp);
2252         kfree(iov);
2253         return rc;
2254 }
2255
2256 int
2257 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2258             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2259 {
2260         struct smb2_file_rename_info info;
2261         void **data;
2262         unsigned int size[2];
2263         int rc;
2264         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2265
2266         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2267         if (!data)
2268                 return -ENOMEM;
2269
2270         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2271                               /* 0 = fail if target already exists */
2272         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2273         info.FileNameLength = cpu_to_le32(len);
2274
2275         data[0] = &info;
2276         size[0] = sizeof(struct smb2_file_rename_info);
2277
2278         data[1] = target_file;
2279         size[1] = len + 2 /* null */;
2280
2281         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2282                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2283                            size);
2284         kfree(data);
2285         return rc;
2286 }
2287
2288 int
2289 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2290                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2291 {
2292         struct smb2_file_link_info info;
2293         void **data;
2294         unsigned int size[2];
2295         int rc;
2296         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2297
2298         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2299         if (!data)
2300                 return -ENOMEM;
2301
2302         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2303                               /* 0 = fail if link already exists */
2304         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2305         info.FileNameLength = cpu_to_le32(len);
2306
2307         data[0] = &info;
2308         size[0] = sizeof(struct smb2_file_link_info);
2309
2310         data[1] = target_file;
2311         size[1] = len + 2 /* null */;
2312
2313         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2314                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2315         kfree(data);
2316         return rc;
2317 }
2318
2319 int
2320 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2321              u64 volatile_fid, u32 pid, __le64 *eof)
2322 {
2323         struct smb2_file_eof_info info;
2324         void *data;
2325         unsigned int size;
2326
2327         info.EndOfFile = *eof;
2328
2329         data = &info;
2330         size = sizeof(struct smb2_file_eof_info);
2331
2332         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2333                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2334 }
2335
2336 int
2337 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2338               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2339 {
2340         unsigned int size;
2341         size = sizeof(FILE_BASIC_INFO);
2342         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2343                              current->tgid, FILE_BASIC_INFORMATION, 1,
2344                              (void **)&buf, &size);
2345 }
2346
2347 int
2348 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2349                   const u64 persistent_fid, const u64 volatile_fid,
2350                   __u8 oplock_level)
2351 {
2352         int rc;
2353         struct smb2_oplock_break *req = NULL;
2354
2355         cifs_dbg(FYI, "SMB2_oplock_break\n");
2356         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2357
2358         if (rc)
2359                 return rc;
2360
2361         req->VolatileFid = volatile_fid;
2362         req->PersistentFid = persistent_fid;
2363         req->OplockLevel = oplock_level;
2364         req->hdr.CreditRequest = cpu_to_le16(1);
2365
2366         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2367         /* SMB2 buffer freed by function above */
2368
2369         if (rc) {
2370                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2371                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2372         }
2373
2374         return rc;
2375 }
2376
2377 static void
2378 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2379                         struct kstatfs *kst)
2380 {
2381         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2382                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2383         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2384         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2385         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2386         return;
2387 }
2388
2389 static int
2390 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2391                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2392 {
2393         int rc;
2394         struct smb2_query_info_req *req;
2395
2396         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2397
2398         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2399                 return -EIO;
2400
2401         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2402         if (rc)
2403                 return rc;
2404
2405         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2406         req->FileInfoClass = level;
2407         req->PersistentFileId = persistent_fid;
2408         req->VolatileFileId = volatile_fid;
2409         /* 4 for rfc1002 length field and 1 for pad */
2410         req->InputBufferOffset =
2411                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2412         req->OutputBufferLength = cpu_to_le32(
2413                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2414
2415         iov->iov_base = (char *)req;
2416         /* 4 for rfc1002 length field */
2417         iov->iov_len = get_rfc1002_length(req) + 4;
2418         return 0;
2419 }
2420
2421 int
2422 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2423               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2424 {
2425         struct smb2_query_info_rsp *rsp = NULL;
2426         struct kvec iov;
2427         int rc = 0;
2428         int resp_buftype;
2429         struct cifs_ses *ses = tcon->ses;
2430         struct smb2_fs_full_size_info *info = NULL;
2431
2432         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2433                                 sizeof(struct smb2_fs_full_size_info),
2434                                 persistent_fid, volatile_fid);
2435         if (rc)
2436                 return rc;
2437
2438         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2439         if (rc) {
2440                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2441                 goto qfsinf_exit;
2442         }
2443         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2444
2445         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2446                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2447         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2448                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2449                           sizeof(struct smb2_fs_full_size_info));
2450         if (!rc)
2451                 copy_fs_info_to_kstatfs(info, fsdata);
2452
2453 qfsinf_exit:
2454         free_rsp_buf(resp_buftype, iov.iov_base);
2455         return rc;
2456 }
2457
2458 int
2459 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2460               u64 persistent_fid, u64 volatile_fid, int level)
2461 {
2462         struct smb2_query_info_rsp *rsp = NULL;
2463         struct kvec iov;
2464         int rc = 0;
2465         int resp_buftype, max_len, min_len;
2466         struct cifs_ses *ses = tcon->ses;
2467         unsigned int rsp_len, offset;
2468
2469         if (level == FS_DEVICE_INFORMATION) {
2470                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2471                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2472         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2473                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2474                 min_len = MIN_FS_ATTR_INFO_SIZE;
2475         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2476                 max_len = sizeof(struct smb3_fs_ss_info);
2477                 min_len = sizeof(struct smb3_fs_ss_info);
2478         } else {
2479                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2480                 return -EINVAL;
2481         }
2482
2483         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2484                                 persistent_fid, volatile_fid);
2485         if (rc)
2486                 return rc;
2487
2488         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2489         if (rc) {
2490                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2491                 goto qfsattr_exit;
2492         }
2493         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2494
2495         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2496         offset = le16_to_cpu(rsp->OutputBufferOffset);
2497         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2498         if (rc)
2499                 goto qfsattr_exit;
2500
2501         if (level == FS_ATTRIBUTE_INFORMATION)
2502                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2503                         + (char *)&rsp->hdr, min_t(unsigned int,
2504                         rsp_len, max_len));
2505         else if (level == FS_DEVICE_INFORMATION)
2506                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2507                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2508         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2509                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2510                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2511                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2512                 tcon->perf_sector_size =
2513                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2514         }
2515
2516 qfsattr_exit:
2517         free_rsp_buf(resp_buftype, iov.iov_base);
2518         return rc;
2519 }
2520
2521 int
2522 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2523            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2524            const __u32 num_lock, struct smb2_lock_element *buf)
2525 {
2526         int rc = 0;
2527         struct smb2_lock_req *req = NULL;
2528         struct kvec iov[2];
2529         int resp_buf_type;
2530         unsigned int count;
2531
2532         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2533
2534         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2535         if (rc)
2536                 return rc;
2537
2538         req->hdr.ProcessId = cpu_to_le32(pid);
2539         req->LockCount = cpu_to_le16(num_lock);
2540
2541         req->PersistentFileId = persist_fid;
2542         req->VolatileFileId = volatile_fid;
2543
2544         count = num_lock * sizeof(struct smb2_lock_element);
2545         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2546
2547         iov[0].iov_base = (char *)req;
2548         /* 4 for rfc1002 length field and count for all locks */
2549         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2550         iov[1].iov_base = (char *)buf;
2551         iov[1].iov_len = count;
2552
2553         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2554         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2555         if (rc) {
2556                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2557                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2558         }
2559
2560         return rc;
2561 }
2562
2563 int
2564 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2565           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2566           const __u64 length, const __u64 offset, const __u32 lock_flags,
2567           const bool wait)
2568 {
2569         struct smb2_lock_element lock;
2570
2571         lock.Offset = cpu_to_le64(offset);
2572         lock.Length = cpu_to_le64(length);
2573         lock.Flags = cpu_to_le32(lock_flags);
2574         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2575                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2576
2577         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2578 }
2579
2580 int
2581 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2582                  __u8 *lease_key, const __le32 lease_state)
2583 {
2584         int rc;
2585         struct smb2_lease_ack *req = NULL;
2586
2587         cifs_dbg(FYI, "SMB2_lease_break\n");
2588         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2589
2590         if (rc)
2591                 return rc;
2592
2593         req->hdr.CreditRequest = cpu_to_le16(1);
2594         req->StructureSize = cpu_to_le16(36);
2595         inc_rfc1001_len(req, 12);
2596
2597         memcpy(req->LeaseKey, lease_key, 16);
2598         req->LeaseState = lease_state;
2599
2600         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2601         /* SMB2 buffer freed by function above */
2602
2603         if (rc) {
2604                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2605                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2606         }
2607
2608         return rc;
2609 }