fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 458 {
 459         int rc = 0;
 460         struct validate_negotiate_info_req vneg_inbuf;
 461         struct validate_negotiate_info_rsp *pneg_rsp;
 462         u32 rsplen;
 463
 464         cifs_dbg(FYI, "validate negotiate\n");
 465
 466         /*
 467          * validation ioctl must be signed, so no point sending this if we
 468          * can not sign it.  We could eventually change this to selectively
 469          * sign just this, the first and only signed request on a connection.
 470          * This is good enough for now since a user who wants better security
 471          * would also enable signing on the mount. Having validation of
 472          * negotiate info for signed connections helps reduce attack vectors
 473          */
 474         if (tcon->ses->server->sign == false)
 475                 return 0; /* validation requires signing */
 476
 477         vneg_inbuf.Capabilities =
 478                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 479         memcpy(vneg_inbuf.Guid, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 480
 481         if (tcon->ses->sign)
 482                 vneg_inbuf.SecurityMode =
 483                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 484         else if (global_secflags & CIFSSEC_MAY_SIGN)
 485                 vneg_inbuf.SecurityMode =
 486                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 487         else
 488                 vneg_inbuf.SecurityMode = 0;
 489
 490         vneg_inbuf.DialectCount = cpu_to_le16(1);
 491         vneg_inbuf.Dialects[0] =
 492                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 493
 494         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 495                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 496                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 497                 (char **)&pneg_rsp, &rsplen);
 498
 499         if (rc != 0) {
 500                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 501                 return -EIO;
 502         }
 503
 504         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 505                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 506                 return -EIO;
 507         }
 508
 509         /* check validate negotiate info response matches what we got earlier */
 510         if (pneg_rsp->Dialect !=
 511                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 512                 goto vneg_out;
 513
 514         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 515                 goto vneg_out;
 516
 517         /* do not validate server guid because not saved at negprot time yet */
 518
 519         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 520               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 521                 goto vneg_out;
 522
 523         /* validate negotiate successful */
 524         cifs_dbg(FYI, "validate negotiate info successful\n");
 525         return 0;
 526
 527 vneg_out:
 528         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 529         return -EIO;
 530 }
 531
 532 int
 533 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 534                 const struct nls_table *nls_cp)
 535 {
 536         struct smb2_sess_setup_req *req;
 537         struct smb2_sess_setup_rsp *rsp = NULL;
 538         struct kvec iov[2];
 539         int rc = 0;
 540         int resp_buftype;
 541         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 542         struct TCP_Server_Info *server = ses->server;
 543         u16 blob_length = 0;
 544         char *security_blob;
 545         char *ntlmssp_blob = NULL;
 546         bool use_spnego = false; /* else use raw ntlmssp */
 547
 548         cifs_dbg(FYI, "Session Setup\n");
 549
 550         if (!server) {
 551                 WARN(1, "%s: server is NULL!\n", __func__);
 552                 return -EIO;
 553         }
 554
 555         /*
 556          * If we are here due to reconnect, free per-smb session key
 557          * in case signing was required.
 558          */
 559         kfree(ses->auth_key.response);
 560         ses->auth_key.response = NULL;
 561
 562         /*
 563          * If memory allocation is successful, caller of this function
 564          * frees it.
 565          */
 566         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 567         if (!ses->ntlmssp)
 568                 return -ENOMEM;
 569         ses->ntlmssp->sesskey_per_smbsess = true;
 570
 571         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 572         ses->sectype = RawNTLMSSP;
 573
 574 ssetup_ntlmssp_authenticate:
 575         if (phase == NtLmChallenge)
 576                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 577
 578         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 579         if (rc)
 580                 return rc;
 581
 582         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 583         req->VcNumber = 0; /* MBZ */
 584         /* to enable echos and oplocks */
 585         req->hdr.CreditRequest = cpu_to_le16(3);
 586
 587         /* only one of SMB2 signing flags may be set in SMB2 request */
 588         if (server->sign)
 589                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 590         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 591                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 592         else
 593                 req->SecurityMode = 0;
 594
 595         req->Capabilities = 0;
 596         req->Channel = 0; /* MBZ */
 597
 598         iov[0].iov_base = (char *)req;
 599         /* 4 for rfc1002 length field and 1 for pad */
 600         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 601         if (phase == NtLmNegotiate) {
 602                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 603                                        GFP_KERNEL);
 604                 if (ntlmssp_blob == NULL) {
 605                         rc = -ENOMEM;
 606                         goto ssetup_exit;
 607                 }
 608                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 609                 if (use_spnego) {
 610                         /* blob_length = build_spnego_ntlmssp_blob(
 611                                         &security_blob,
 612                                         sizeof(struct _NEGOTIATE_MESSAGE),
 613                                         ntlmssp_blob); */
 614                         /* BB eventually need to add this */
 615                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 616                         rc = -EOPNOTSUPP;
 617                         kfree(ntlmssp_blob);
 618                         goto ssetup_exit;
 619                 } else {
 620                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 621                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 622                         security_blob = ntlmssp_blob;
 623                 }
 624         } else if (phase == NtLmAuthenticate) {
 625                 req->hdr.SessionId = ses->Suid;
 626                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 627                                        GFP_KERNEL);
 628                 if (ntlmssp_blob == NULL) {
 629                         rc = -ENOMEM;
 630                         goto ssetup_exit;
 631                 }
 632                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 633                                              nls_cp);
 634                 if (rc) {
 635                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 636                                  rc);
 637                         goto ssetup_exit; /* BB double check error handling */
 638                 }
 639                 if (use_spnego) {
 640                         /* blob_length = build_spnego_ntlmssp_blob(
 641                                                         &security_blob,
 642                                                         blob_length,
 643                                                         ntlmssp_blob); */
 644                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 645                         rc = -EOPNOTSUPP;
 646                         kfree(ntlmssp_blob);
 647                         goto ssetup_exit;
 648                 } else {
 649                         security_blob = ntlmssp_blob;
 650                 }
 651         } else {
 652                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 653                 rc = -EIO;
 654                 goto ssetup_exit;
 655         }
 656
 657         /* Testing shows that buffer offset must be at location of Buffer[0] */
 658         req->SecurityBufferOffset =
 659                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 660                                             1 /* pad */ - 4 /* rfc1001 len */);
 661         req->SecurityBufferLength = cpu_to_le16(blob_length);
 662         iov[1].iov_base = security_blob;
 663         iov[1].iov_len = blob_length;
 664
 665         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 666
 667         /* BB add code to build os and lm fields */
 668
 669         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 670                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 671
 672         kfree(security_blob);
 673         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 674         if (resp_buftype != CIFS_NO_BUFFER &&
 675             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 676                 if (phase != NtLmNegotiate) {
 677                         cifs_dbg(VFS, "Unexpected more processing error\n");
 678                         goto ssetup_exit;
 679                 }
 680                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 681                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 682                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 683                                  le16_to_cpu(rsp->SecurityBufferOffset));
 684                         rc = -EIO;
 685                         goto ssetup_exit;
 686                 }
 687
 688                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 689                 phase = NtLmChallenge; /* process ntlmssp challenge */
 690                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 691                 ses->Suid = rsp->hdr.SessionId;
 692                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 693                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 694         }
 695
 696         /*
 697          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 698          * but at least the raw NTLMSSP case works.
 699          */
 700         /*
 701          * No tcon so can't do
 702          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 703          */
 704         if (rc != 0)
 705                 goto ssetup_exit;
 706
 707         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 708         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 709                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 710 ssetup_exit:
 711         free_rsp_buf(resp_buftype, rsp);
 712
 713         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 714         if ((phase == NtLmChallenge) && (rc == 0))
 715                 goto ssetup_ntlmssp_authenticate;
 716
 717         if (!rc) {
 718                 mutex_lock(&server->srv_mutex);
 719                 if (server->sign && server->ops->generate_signingkey) {
 720                         rc = server->ops->generate_signingkey(ses);
 721                         kfree(ses->auth_key.response);
 722                         ses->auth_key.response = NULL;
 723                         if (rc) {
 724                                 cifs_dbg(FYI,
 725                                         "SMB3 session key generation failed\n");
 726                                 mutex_unlock(&server->srv_mutex);
 727                                 goto keygen_exit;
 728                         }
 729                 }
 730                 if (!server->session_estab) {
 731                         server->sequence_number = 0x2;
 732                         server->session_estab = true;
 733                 }
 734                 mutex_unlock(&server->srv_mutex);
 735
 736                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 737                 spin_lock(&GlobalMid_Lock);
 738                 ses->status = CifsGood;
 739                 ses->need_reconnect = false;
 740                 spin_unlock(&GlobalMid_Lock);
 741         }
 742
 743 keygen_exit:
 744         if (!server->sign) {
 745                 kfree(ses->auth_key.response);
 746                 ses->auth_key.response = NULL;
 747         }
 748         kfree(ses->ntlmssp);
 749
 750         return rc;
 751 }
 752
 753 int
 754 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 755 {
 756         struct smb2_logoff_req *req; /* response is also trivial struct */
 757         int rc = 0;
 758         struct TCP_Server_Info *server;
 759
 760         cifs_dbg(FYI, "disconnect session %p\n", ses);
 761
 762         if (ses && (ses->server))
 763                 server = ses->server;
 764         else
 765                 return -EIO;
 766
 767         /* no need to send SMB logoff if uid already closed due to reconnect */
 768         if (ses->need_reconnect)
 769                 goto smb2_session_already_dead;
 770
 771         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 772         if (rc)
 773                 return rc;
 774
 775          /* since no tcon, smb2_init can not do this, so do here */
 776         req->hdr.SessionId = ses->Suid;
 777         if (server->sign)
 778                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 779
 780         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 781         /*
 782          * No tcon so can't do
 783          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 784          */
 785
 786 smb2_session_already_dead:
 787         return rc;
 788 }
 789
 790 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 791 {
 792         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 793 }
 794
 795 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 796
 797 /* These are similar values to what Windows uses */
 798 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 799 {
 800         tcon->max_chunks = 256;
 801         tcon->max_bytes_chunk = 1048576;
 802         tcon->max_bytes_copy = 16777216;
 803 }
 804
 805 int
 806 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 807           struct cifs_tcon *tcon, const struct nls_table *cp)
 808 {
 809         struct smb2_tree_connect_req *req;
 810         struct smb2_tree_connect_rsp *rsp = NULL;
 811         struct kvec iov[2];
 812         int rc = 0;
 813         int resp_buftype;
 814         int unc_path_len;
 815         struct TCP_Server_Info *server;
 816         __le16 *unc_path = NULL;
 817
 818         cifs_dbg(FYI, "TCON\n");
 819
 820         if ((ses->server) && tree)
 821                 server = ses->server;
 822         else
 823                 return -EIO;
 824
 825         if (tcon && tcon->bad_network_name)
 826                 return -ENOENT;
 827
 828         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 829         if (unc_path == NULL)
 830                 return -ENOMEM;
 831
 832         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 833         unc_path_len *= 2;
 834         if (unc_path_len < 2) {
 835                 kfree(unc_path);
 836                 return -EINVAL;
 837         }
 838
 839         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 840         if (rc) {
 841                 kfree(unc_path);
 842                 return rc;
 843         }
 844
 845         if (tcon == NULL) {
 846                 /* since no tcon, smb2_init can not do this, so do here */
 847                 req->hdr.SessionId = ses->Suid;
 848                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 849                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 850         }
 851
 852         iov[0].iov_base = (char *)req;
 853         /* 4 for rfc1002 length field and 1 for pad */
 854         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 855
 856         /* Testing shows that buffer offset must be at location of Buffer[0] */
 857         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 858                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 859         req->PathLength = cpu_to_le16(unc_path_len - 2);
 860         iov[1].iov_base = unc_path;
 861         iov[1].iov_len = unc_path_len;
 862
 863         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 864
 865         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 866         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 867
 868         if (rc != 0) {
 869                 if (tcon) {
 870                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 871                         tcon->need_reconnect = true;
 872                 }
 873                 goto tcon_error_exit;
 874         }
 875
 876         if (tcon == NULL) {
 877                 ses->ipc_tid = rsp->hdr.TreeId;
 878                 goto tcon_exit;
 879         }
 880
 881         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 882                 cifs_dbg(FYI, "connection to disk share\n");
 883         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 884                 tcon->ipc = true;
 885                 cifs_dbg(FYI, "connection to pipe share\n");
 886         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 887                 tcon->print = true;
 888                 cifs_dbg(FYI, "connection to printer\n");
 889         } else {
 890                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 891                 rc = -EOPNOTSUPP;
 892                 goto tcon_error_exit;
 893         }
 894
 895         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 896         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 897         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 898         tcon->tidStatus = CifsGood;
 899         tcon->need_reconnect = false;
 900         tcon->tid = rsp->hdr.TreeId;
 901         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 902
 903         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 904             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 905                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 906         init_copy_chunk_defaults(tcon);
 907         if (tcon->ses->server->ops->validate_negotiate)
 908                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 909 tcon_exit:
 910         free_rsp_buf(resp_buftype, rsp);
 911         kfree(unc_path);
 912         return rc;
 913
 914 tcon_error_exit:
 915         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 916                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 917                 tcon->bad_network_name = true;
 918         }
 919         goto tcon_exit;
 920 }
 921
 922 int
 923 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 924 {
 925         struct smb2_tree_disconnect_req *req; /* response is trivial */
 926         int rc = 0;
 927         struct TCP_Server_Info *server;
 928         struct cifs_ses *ses = tcon->ses;
 929
 930         cifs_dbg(FYI, "Tree Disconnect\n");
 931
 932         if (ses && (ses->server))
 933                 server = ses->server;
 934         else
 935                 return -EIO;
 936
 937         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 938                 return 0;
 939
 940         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 941         if (rc)
 942                 return rc;
 943
 944         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 945         if (rc)
 946                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 947
 948         return rc;
 949 }
 950
 951
 952 static struct create_durable *
 953 create_durable_buf(void)
 954 {
 955         struct create_durable *buf;
 956
 957         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 958         if (!buf)
 959                 return NULL;
 960
 961         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 962                                         (struct create_durable, Data));
 963         buf->ccontext.DataLength = cpu_to_le32(16);
 964         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 965                                 (struct create_durable, Name));
 966         buf->ccontext.NameLength = cpu_to_le16(4);
 967         buf->Name[0] = 'D';
 968         buf->Name[1] = 'H';
 969         buf->Name[2] = 'n';
 970         buf->Name[3] = 'Q';
 971         return buf;
 972 }
 973
 974 static struct create_durable *
 975 create_reconnect_durable_buf(struct cifs_fid *fid)
 976 {
 977         struct create_durable *buf;
 978
 979         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 980         if (!buf)
 981                 return NULL;
 982
 983         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 984                                         (struct create_durable, Data));
 985         buf->ccontext.DataLength = cpu_to_le32(16);
 986         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 987                                 (struct create_durable, Name));
 988         buf->ccontext.NameLength = cpu_to_le16(4);
 989         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 990         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 991         buf->Name[0] = 'D';
 992         buf->Name[1] = 'H';
 993         buf->Name[2] = 'n';
 994         buf->Name[3] = 'C';
 995         return buf;
 996 }
 997
 998 static __u8
 999 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1000                   unsigned int *epoch)
1001 {
1002         char *data_offset;
1003         struct create_context *cc;
1004         unsigned int next = 0;
1005         char *name;
1006
1007         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1008         cc = (struct create_context *)data_offset;
1009         do {
1010                 cc = (struct create_context *)((char *)cc + next);
1011                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1012                 if (le16_to_cpu(cc->NameLength) != 4 ||
1013                     strncmp(name, "RqLs", 4)) {
1014                         next = le32_to_cpu(cc->Next);
1015                         continue;
1016                 }
1017                 return server->ops->parse_lease_buf(cc, epoch);
1018         } while (next != 0);
1019
1020         return 0;
1021 }
1022
1023 static int
1024 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1025                   unsigned int *num_iovec, __u8 *oplock)
1026 {
1027         struct smb2_create_req *req = iov[0].iov_base;
1028         unsigned int num = *num_iovec;
1029
1030         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1031         if (iov[num].iov_base == NULL)
1032                 return -ENOMEM;
1033         iov[num].iov_len = server->vals->create_lease_size;
1034         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1035         if (!req->CreateContextsOffset)
1036                 req->CreateContextsOffset = cpu_to_le32(
1037                                 sizeof(struct smb2_create_req) - 4 +
1038                                 iov[num - 1].iov_len);
1039         le32_add_cpu(&req->CreateContextsLength,
1040                      server->vals->create_lease_size);
1041         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1042         *num_iovec = num + 1;
1043         return 0;
1044 }
1045
1046 static int
1047 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1048                     struct cifs_open_parms *oparms)
1049 {
1050         struct smb2_create_req *req = iov[0].iov_base;
1051         unsigned int num = *num_iovec;
1052
1053         if (oparms->reconnect) {
1054                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1055                 /* indicate that we don't need to relock the file */
1056                 oparms->reconnect = false;
1057         } else
1058                 iov[num].iov_base = create_durable_buf();
1059         if (iov[num].iov_base == NULL)
1060                 return -ENOMEM;
1061         iov[num].iov_len = sizeof(struct create_durable);
1062         if (!req->CreateContextsOffset)
1063                 req->CreateContextsOffset =
1064                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1065                                                                 iov[1].iov_len);
1066         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1067         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1068         *num_iovec = num + 1;
1069         return 0;
1070 }
1071
1072 int
1073 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1074           __u8 *oplock, struct smb2_file_all_info *buf,
1075           struct smb2_err_rsp **err_buf)
1076 {
1077         struct smb2_create_req *req;
1078         struct smb2_create_rsp *rsp;
1079         struct TCP_Server_Info *server;
1080         struct cifs_tcon *tcon = oparms->tcon;
1081         struct cifs_ses *ses = tcon->ses;
1082         struct kvec iov[4];
1083         int resp_buftype;
1084         int uni_path_len;
1085         __le16 *copy_path = NULL;
1086         int copy_size;
1087         int rc = 0;
1088         unsigned int num_iovecs = 2;
1089         __u32 file_attributes = 0;
1090
1091         cifs_dbg(FYI, "create/open\n");
1092
1093         if (ses && (ses->server))
1094                 server = ses->server;
1095         else
1096                 return -EIO;
1097
1098         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1099         if (rc)
1100                 return rc;
1101
1102         if (oparms->create_options & CREATE_OPTION_READONLY)
1103                 file_attributes |= ATTR_READONLY;
1104
1105         req->ImpersonationLevel = IL_IMPERSONATION;
1106         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1107         /* File attributes ignored on open (used in create though) */
1108         req->FileAttributes = cpu_to_le32(file_attributes);
1109         req->ShareAccess = FILE_SHARE_ALL_LE;
1110         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1111         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1112         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1113         /* do not count rfc1001 len field */
1114         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1115
1116         iov[0].iov_base = (char *)req;
1117         /* 4 for rfc1002 length field */
1118         iov[0].iov_len = get_rfc1002_length(req) + 4;
1119
1120         /* MUST set path len (NameLength) to 0 opening root of share */
1121         req->NameLength = cpu_to_le16(uni_path_len - 2);
1122         /* -1 since last byte is buf[0] which is sent below (path) */
1123         iov[0].iov_len--;
1124         if (uni_path_len % 8 != 0) {
1125                 copy_size = uni_path_len / 8 * 8;
1126                 if (copy_size < uni_path_len)
1127                         copy_size += 8;
1128
1129                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1130                 if (!copy_path)
1131                         return -ENOMEM;
1132                 memcpy((char *)copy_path, (const char *)path,
1133                         uni_path_len);
1134                 uni_path_len = copy_size;
1135                 path = copy_path;
1136         }
1137
1138         iov[1].iov_len = uni_path_len;
1139         iov[1].iov_base = path;
1140         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1141         inc_rfc1001_len(req, uni_path_len - 1);
1142
1143         if (!server->oplocks)
1144                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1145
1146         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1147             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1148                 req->RequestedOplockLevel = *oplock;
1149         else {
1150                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1151                 if (rc) {
1152                         cifs_small_buf_release(req);
1153                         kfree(copy_path);
1154                         return rc;
1155                 }
1156         }
1157
1158         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1159                 /* need to set Next field of lease context if we request it */
1160                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1161                         struct create_context *ccontext =
1162                             (struct create_context *)iov[num_iovecs-1].iov_base;
1163                         ccontext->Next =
1164                                 cpu_to_le32(server->vals->create_lease_size);
1165                 }
1166                 rc = add_durable_context(iov, &num_iovecs, oparms);
1167                 if (rc) {
1168                         cifs_small_buf_release(req);
1169                         kfree(copy_path);
1170                         kfree(iov[num_iovecs-1].iov_base);
1171                         return rc;
1172                 }
1173         }
1174
1175         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1176         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1177
1178         if (rc != 0) {
1179                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1180                 if (err_buf)
1181                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1182                                            GFP_KERNEL);
1183                 goto creat_exit;
1184         }
1185
1186         oparms->fid->persistent_fid = rsp->PersistentFileId;
1187         oparms->fid->volatile_fid = rsp->VolatileFileId;
1188
1189         if (buf) {
1190                 memcpy(buf, &rsp->CreationTime, 32);
1191                 buf->AllocationSize = rsp->AllocationSize;
1192                 buf->EndOfFile = rsp->EndofFile;
1193                 buf->Attributes = rsp->FileAttributes;
1194                 buf->NumberOfLinks = cpu_to_le32(1);
1195                 buf->DeletePending = 0;
1196         }
1197
1198         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1199                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1200         else
1201                 *oplock = rsp->OplockLevel;
1202 creat_exit:
1203         kfree(copy_path);
1204         free_rsp_buf(resp_buftype, rsp);
1205         return rc;
1206 }
1207
1208 /*
1209  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1210  */
1211 int
1212 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1213            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1214            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1215 {
1216         struct smb2_ioctl_req *req;
1217         struct smb2_ioctl_rsp *rsp;
1218         struct TCP_Server_Info *server;
1219         struct cifs_ses *ses = tcon->ses;
1220         struct kvec iov[2];
1221         int resp_buftype;
1222         int num_iovecs;
1223         int rc = 0;
1224
1225         cifs_dbg(FYI, "SMB2 IOCTL\n");
1226
1227         *out_data = NULL;
1228         /* zero out returned data len, in case of error */
1229         if (plen)
1230                 *plen = 0;
1231
1232         if (ses && (ses->server))
1233                 server = ses->server;
1234         else
1235                 return -EIO;
1236
1237         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1238         if (rc)
1239                 return rc;
1240
1241         req->CtlCode = cpu_to_le32(opcode);
1242         req->PersistentFileId = persistent_fid;
1243         req->VolatileFileId = volatile_fid;
1244
1245         if (indatalen) {
1246                 req->InputCount = cpu_to_le32(indatalen);
1247                 /* do not set InputOffset if no input data */
1248                 req->InputOffset =
1249                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1250                 iov[1].iov_base = in_data;
1251                 iov[1].iov_len = indatalen;
1252                 num_iovecs = 2;
1253         } else
1254                 num_iovecs = 1;
1255
1256         req->OutputOffset = 0;
1257         req->OutputCount = 0; /* MBZ */
1258
1259         /*
1260          * Could increase MaxOutputResponse, but that would require more
1261          * than one credit. Windows typically sets this smaller, but for some
1262          * ioctls it may be useful to allow server to send more. No point
1263          * limiting what the server can send as long as fits in one credit
1264          */
1265         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1266
1267         if (is_fsctl)
1268                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1269         else
1270                 req->Flags = 0;
1271
1272         iov[0].iov_base = (char *)req;
1273
1274         /*
1275          * If no input data, the size of ioctl struct in
1276          * protocol spec still includes a 1 byte data buffer,
1277          * but if input data passed to ioctl, we do not
1278          * want to double count this, so we do not send
1279          * the dummy one byte of data in iovec[0] if sending
1280          * input data (in iovec[1]). We also must add 4 bytes
1281          * in first iovec to allow for rfc1002 length field.
1282          */
1283
1284         if (indatalen) {
1285                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1286                 inc_rfc1001_len(req, indatalen - 1);
1287         } else
1288                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1289
1290
1291         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1292         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1293
1294         if ((rc != 0) && (rc != -EINVAL)) {
1295                 if (tcon)
1296                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1297                 goto ioctl_exit;
1298         } else if (rc == -EINVAL) {
1299                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1300                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1301                         if (tcon)
1302                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1303                         goto ioctl_exit;
1304                 }
1305         }
1306
1307         /* check if caller wants to look at return data or just return rc */
1308         if ((plen == NULL) || (out_data == NULL))
1309                 goto ioctl_exit;
1310
1311         *plen = le32_to_cpu(rsp->OutputCount);
1312
1313         /* We check for obvious errors in the output buffer length and offset */
1314         if (*plen == 0)
1315                 goto ioctl_exit; /* server returned no data */
1316         else if (*plen > 0xFF00) {
1317                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1318                 *plen = 0;
1319                 rc = -EIO;
1320                 goto ioctl_exit;
1321         }
1322
1323         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1324                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1325                         le32_to_cpu(rsp->OutputOffset));
1326                 *plen = 0;
1327                 rc = -EIO;
1328                 goto ioctl_exit;
1329         }
1330
1331         *out_data = kmalloc(*plen, GFP_KERNEL);
1332         if (*out_data == NULL) {
1333                 rc = -ENOMEM;
1334                 goto ioctl_exit;
1335         }
1336
1337         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1338                *plen);
1339 ioctl_exit:
1340         free_rsp_buf(resp_buftype, rsp);
1341         return rc;
1342 }
1343
1344 /*
1345  *   Individual callers to ioctl worker function follow
1346  */
1347
1348 int
1349 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1350                      u64 persistent_fid, u64 volatile_fid)
1351 {
1352         int rc;
1353         char *res_key = NULL;
1354         struct  compress_ioctl fsctl_input;
1355         char *ret_data = NULL;
1356
1357         fsctl_input.CompressionState =
1358                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1359
1360         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1361                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1362                         (char *)&fsctl_input /* data input */,
1363                         2 /* in data len */, &ret_data /* out data */, NULL);
1364
1365         cifs_dbg(FYI, "set compression rc %d\n", rc);
1366         kfree(res_key);
1367
1368         return rc;
1369 }
1370
1371 int
1372 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1373            u64 persistent_fid, u64 volatile_fid)
1374 {
1375         struct smb2_close_req *req;
1376         struct smb2_close_rsp *rsp;
1377         struct TCP_Server_Info *server;
1378         struct cifs_ses *ses = tcon->ses;
1379         struct kvec iov[1];
1380         int resp_buftype;
1381         int rc = 0;
1382
1383         cifs_dbg(FYI, "Close\n");
1384
1385         if (ses && (ses->server))
1386                 server = ses->server;
1387         else
1388                 return -EIO;
1389
1390         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1391         if (rc)
1392                 return rc;
1393
1394         req->PersistentFileId = persistent_fid;
1395         req->VolatileFileId = volatile_fid;
1396
1397         iov[0].iov_base = (char *)req;
1398         /* 4 for rfc1002 length field */
1399         iov[0].iov_len = get_rfc1002_length(req) + 4;
1400
1401         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1402         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1403
1404         if (rc != 0) {
1405                 if (tcon)
1406                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1407                 goto close_exit;
1408         }
1409
1410         /* BB FIXME - decode close response, update inode for caching */
1411
1412 close_exit:
1413         free_rsp_buf(resp_buftype, rsp);
1414         return rc;
1415 }
1416
1417 static int
1418 validate_buf(unsigned int offset, unsigned int buffer_length,
1419              struct smb2_hdr *hdr, unsigned int min_buf_size)
1420
1421 {
1422         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1423         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1424         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1425         char *end_of_buf = begin_of_buf + buffer_length;
1426
1427
1428         if (buffer_length < min_buf_size) {
1429                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1430                          buffer_length, min_buf_size);
1431                 return -EINVAL;
1432         }
1433
1434         /* check if beyond RFC1001 maximum length */
1435         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1436                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1437                          buffer_length, smb_len);
1438                 return -EINVAL;
1439         }
1440
1441         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1442                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1443                 return -EINVAL;
1444         }
1445
1446         return 0;
1447 }
1448
1449 /*
1450  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1451  * Caller must free buffer.
1452  */
1453 static int
1454 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1455                       struct smb2_hdr *hdr, unsigned int minbufsize,
1456                       char *data)
1457
1458 {
1459         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1460         int rc;
1461
1462         if (!data)
1463                 return -EINVAL;
1464
1465         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1466         if (rc)
1467                 return rc;
1468
1469         memcpy(data, begin_of_buf, buffer_length);
1470
1471         return 0;
1472 }
1473
1474 static int
1475 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1476            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1477            size_t output_len, size_t min_len, void *data)
1478 {
1479         struct smb2_query_info_req *req;
1480         struct smb2_query_info_rsp *rsp = NULL;
1481         struct kvec iov[2];
1482         int rc = 0;
1483         int resp_buftype;
1484         struct TCP_Server_Info *server;
1485         struct cifs_ses *ses = tcon->ses;
1486
1487         cifs_dbg(FYI, "Query Info\n");
1488
1489         if (ses && (ses->server))
1490                 server = ses->server;
1491         else
1492                 return -EIO;
1493
1494         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1495         if (rc)
1496                 return rc;
1497
1498         req->InfoType = SMB2_O_INFO_FILE;
1499         req->FileInfoClass = info_class;
1500         req->PersistentFileId = persistent_fid;
1501         req->VolatileFileId = volatile_fid;
1502         /* 4 for rfc1002 length field and 1 for Buffer */
1503         req->InputBufferOffset =
1504                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1505         req->OutputBufferLength = cpu_to_le32(output_len);
1506
1507         iov[0].iov_base = (char *)req;
1508         /* 4 for rfc1002 length field */
1509         iov[0].iov_len = get_rfc1002_length(req) + 4;
1510
1511         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1512         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1513
1514         if (rc) {
1515                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1516                 goto qinf_exit;
1517         }
1518
1519         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1520                                    le32_to_cpu(rsp->OutputBufferLength),
1521                                    &rsp->hdr, min_len, data);
1522
1523 qinf_exit:
1524         free_rsp_buf(resp_buftype, rsp);
1525         return rc;
1526 }
1527
1528 int
1529 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1530                 u64 persistent_fid, u64 volatile_fid,
1531                 struct smb2_file_all_info *data)
1532 {
1533         return query_info(xid, tcon, persistent_fid, volatile_fid,
1534                           FILE_ALL_INFORMATION,
1535                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1536                           sizeof(struct smb2_file_all_info), data);
1537 }
1538
1539 int
1540 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1541                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1542 {
1543         return query_info(xid, tcon, persistent_fid, volatile_fid,
1544                           FILE_INTERNAL_INFORMATION,
1545                           sizeof(struct smb2_file_internal_info),
1546                           sizeof(struct smb2_file_internal_info), uniqueid);
1547 }
1548
1549 /*
1550  * This is a no-op for now. We're not really interested in the reply, but
1551  * rather in the fact that the server sent one and that server->lstrp
1552  * gets updated.
1553  *
1554  * FIXME: maybe we should consider checking that the reply matches request?
1555  */
1556 static void
1557 smb2_echo_callback(struct mid_q_entry *mid)
1558 {
1559         struct TCP_Server_Info *server = mid->callback_data;
1560         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1561         unsigned int credits_received = 1;
1562
1563         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1564                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1565
1566         DeleteMidQEntry(mid);
1567         add_credits(server, credits_received, CIFS_ECHO_OP);
1568 }
1569
1570 int
1571 SMB2_echo(struct TCP_Server_Info *server)
1572 {
1573         struct smb2_echo_req *req;
1574         int rc = 0;
1575         struct kvec iov;
1576         struct smb_rqst rqst = { .rq_iov = &iov,
1577                                  .rq_nvec = 1 };
1578
1579         cifs_dbg(FYI, "In echo request\n");
1580
1581         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1582         if (rc)
1583                 return rc;
1584
1585         req->hdr.CreditRequest = cpu_to_le16(1);
1586
1587         iov.iov_base = (char *)req;
1588         /* 4 for rfc1002 length field */
1589         iov.iov_len = get_rfc1002_length(req) + 4;
1590
1591         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1592                              CIFS_ECHO_OP);
1593         if (rc)
1594                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1595
1596         cifs_small_buf_release(req);
1597         return rc;
1598 }
1599
1600 int
1601 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1602            u64 volatile_fid)
1603 {
1604         struct smb2_flush_req *req;
1605         struct TCP_Server_Info *server;
1606         struct cifs_ses *ses = tcon->ses;
1607         struct kvec iov[1];
1608         int resp_buftype;
1609         int rc = 0;
1610
1611         cifs_dbg(FYI, "Flush\n");
1612
1613         if (ses && (ses->server))
1614                 server = ses->server;
1615         else
1616                 return -EIO;
1617
1618         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1619         if (rc)
1620                 return rc;
1621
1622         req->PersistentFileId = persistent_fid;
1623         req->VolatileFileId = volatile_fid;
1624
1625         iov[0].iov_base = (char *)req;
1626         /* 4 for rfc1002 length field */
1627         iov[0].iov_len = get_rfc1002_length(req) + 4;
1628
1629         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1630
1631         if ((rc != 0) && tcon)
1632                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1633
1634         free_rsp_buf(resp_buftype, iov[0].iov_base);
1635         return rc;
1636 }
1637
1638 /*
1639  * To form a chain of read requests, any read requests after the first should
1640  * have the end_of_chain boolean set to true.
1641  */
1642 static int
1643 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1644                   unsigned int remaining_bytes, int request_type)
1645 {
1646         int rc = -EACCES;
1647         struct smb2_read_req *req = NULL;
1648
1649         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1650         if (rc)
1651                 return rc;
1652         if (io_parms->tcon->ses->server == NULL)
1653                 return -ECONNABORTED;
1654
1655         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1656
1657         req->PersistentFileId = io_parms->persistent_fid;
1658         req->VolatileFileId = io_parms->volatile_fid;
1659         req->ReadChannelInfoOffset = 0; /* reserved */
1660         req->ReadChannelInfoLength = 0; /* reserved */
1661         req->Channel = 0; /* reserved */
1662         req->MinimumCount = 0;
1663         req->Length = cpu_to_le32(io_parms->length);
1664         req->Offset = cpu_to_le64(io_parms->offset);
1665
1666         if (request_type & CHAINED_REQUEST) {
1667                 if (!(request_type & END_OF_CHAIN)) {
1668                         /* 4 for rfc1002 length field */
1669                         req->hdr.NextCommand =
1670                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1671                 } else /* END_OF_CHAIN */
1672                         req->hdr.NextCommand = 0;
1673                 if (request_type & RELATED_REQUEST) {
1674                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1675                         /*
1676                          * Related requests use info from previous read request
1677                          * in chain.
1678                          */
1679                         req->hdr.SessionId = 0xFFFFFFFF;
1680                         req->hdr.TreeId = 0xFFFFFFFF;
1681                         req->PersistentFileId = 0xFFFFFFFF;
1682                         req->VolatileFileId = 0xFFFFFFFF;
1683                 }
1684         }
1685         if (remaining_bytes > io_parms->length)
1686                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1687         else
1688                 req->RemainingBytes = 0;
1689
1690         iov[0].iov_base = (char *)req;
1691         /* 4 for rfc1002 length field */
1692         iov[0].iov_len = get_rfc1002_length(req) + 4;
1693         return rc;
1694 }
1695
1696 static void
1697 smb2_readv_callback(struct mid_q_entry *mid)
1698 {
1699         struct cifs_readdata *rdata = mid->callback_data;
1700         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1701         struct TCP_Server_Info *server = tcon->ses->server;
1702         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1703         unsigned int credits_received = 1;
1704         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1705                                  .rq_nvec = 1,
1706                                  .rq_pages = rdata->pages,
1707                                  .rq_npages = rdata->nr_pages,
1708                                  .rq_pagesz = rdata->pagesz,
1709                                  .rq_tailsz = rdata->tailsz };
1710
1711         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1712                  __func__, mid->mid, mid->mid_state, rdata->result,
1713                  rdata->bytes);
1714
1715         switch (mid->mid_state) {
1716         case MID_RESPONSE_RECEIVED:
1717                 credits_received = le16_to_cpu(buf->CreditRequest);
1718                 /* result already set, check signature */
1719                 if (server->sign) {
1720                         int rc;
1721
1722                         rc = smb2_verify_signature(&rqst, server);
1723                         if (rc)
1724                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1725                                          rc);
1726                 }
1727                 /* FIXME: should this be counted toward the initiating task? */
1728                 task_io_account_read(rdata->bytes);
1729                 cifs_stats_bytes_read(tcon, rdata->bytes);
1730                 break;
1731         case MID_REQUEST_SUBMITTED:
1732         case MID_RETRY_NEEDED:
1733                 rdata->result = -EAGAIN;
1734                 break;
1735         default:
1736                 if (rdata->result != -ENODATA)
1737                         rdata->result = -EIO;
1738         }
1739
1740         if (rdata->result)
1741                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1742
1743         queue_work(cifsiod_wq, &rdata->work);
1744         DeleteMidQEntry(mid);
1745         add_credits(server, credits_received, 0);
1746 }
1747
1748 /* smb2_async_readv - send an async write, and set up mid to handle result */
1749 int
1750 smb2_async_readv(struct cifs_readdata *rdata)
1751 {
1752         int rc;
1753         struct smb2_hdr *buf;
1754         struct cifs_io_parms io_parms;
1755         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1756                                  .rq_nvec = 1 };
1757
1758         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1759                  __func__, rdata->offset, rdata->bytes);
1760
1761         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1762         io_parms.offset = rdata->offset;
1763         io_parms.length = rdata->bytes;
1764         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1765         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1766         io_parms.pid = rdata->pid;
1767         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1768         if (rc)
1769                 return rc;
1770
1771         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1772         /* 4 for rfc1002 length field */
1773         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1774
1775         kref_get(&rdata->refcount);
1776         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1777                              cifs_readv_receive, smb2_readv_callback,
1778                              rdata, 0);
1779         if (rc) {
1780                 kref_put(&rdata->refcount, cifs_readdata_release);
1781                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1782         }
1783
1784         cifs_small_buf_release(buf);
1785         return rc;
1786 }
1787
1788 int
1789 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1790           unsigned int *nbytes, char **buf, int *buf_type)
1791 {
1792         int resp_buftype, rc = -EACCES;
1793         struct smb2_read_rsp *rsp = NULL;
1794         struct kvec iov[1];
1795
1796         *nbytes = 0;
1797         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1798         if (rc)
1799                 return rc;
1800
1801         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1802                           &resp_buftype, CIFS_LOG_ERROR);
1803
1804         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1805
1806         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1807                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1808                 return 0;
1809         }
1810
1811         if (rc) {
1812                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1813                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1814         } else {
1815                 *nbytes = le32_to_cpu(rsp->DataLength);
1816                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1817                     (*nbytes > io_parms->length)) {
1818                         cifs_dbg(FYI, "bad length %d for count %d\n",
1819                                  *nbytes, io_parms->length);
1820                         rc = -EIO;
1821                         *nbytes = 0;
1822                 }
1823         }
1824
1825         if (*buf) {
1826                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1827                        *nbytes);
1828                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1829         } else if (resp_buftype != CIFS_NO_BUFFER) {
1830                 *buf = iov[0].iov_base;
1831                 if (resp_buftype == CIFS_SMALL_BUFFER)
1832                         *buf_type = CIFS_SMALL_BUFFER;
1833                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1834                         *buf_type = CIFS_LARGE_BUFFER;
1835         }
1836         return rc;
1837 }
1838
1839 /*
1840  * Check the mid_state and signature on received buffer (if any), and queue the
1841  * workqueue completion task.
1842  */
1843 static void
1844 smb2_writev_callback(struct mid_q_entry *mid)
1845 {
1846         struct cifs_writedata *wdata = mid->callback_data;
1847         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1848         unsigned int written;
1849         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1850         unsigned int credits_received = 1;
1851
1852         switch (mid->mid_state) {
1853         case MID_RESPONSE_RECEIVED:
1854                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1855                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1856                 if (wdata->result != 0)
1857                         break;
1858
1859                 written = le32_to_cpu(rsp->DataLength);
1860                 /*
1861                  * Mask off high 16 bits when bytes written as returned
1862                  * by the server is greater than bytes requested by the
1863                  * client. OS/2 servers are known to set incorrect
1864                  * CountHigh values.
1865                  */
1866                 if (written > wdata->bytes)
1867                         written &= 0xFFFF;
1868
1869                 if (written < wdata->bytes)
1870                         wdata->result = -ENOSPC;
1871                 else
1872                         wdata->bytes = written;
1873                 break;
1874         case MID_REQUEST_SUBMITTED:
1875         case MID_RETRY_NEEDED:
1876                 wdata->result = -EAGAIN;
1877                 break;
1878         default:
1879                 wdata->result = -EIO;
1880                 break;
1881         }
1882
1883         if (wdata->result)
1884                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1885
1886         queue_work(cifsiod_wq, &wdata->work);
1887         DeleteMidQEntry(mid);
1888         add_credits(tcon->ses->server, credits_received, 0);
1889 }
1890
1891 /* smb2_async_writev - send an async write, and set up mid to handle result */
1892 int
1893 smb2_async_writev(struct cifs_writedata *wdata)
1894 {
1895         int rc = -EACCES;
1896         struct smb2_write_req *req = NULL;
1897         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1898         struct kvec iov;
1899         struct smb_rqst rqst;
1900
1901         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1902         if (rc)
1903                 goto async_writev_out;
1904
1905         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1906
1907         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1908         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1909         req->WriteChannelInfoOffset = 0;
1910         req->WriteChannelInfoLength = 0;
1911         req->Channel = 0;
1912         req->Offset = cpu_to_le64(wdata->offset);
1913         /* 4 for rfc1002 length field */
1914         req->DataOffset = cpu_to_le16(
1915                                 offsetof(struct smb2_write_req, Buffer) - 4);
1916         req->RemainingBytes = 0;
1917
1918         /* 4 for rfc1002 length field and 1 for Buffer */
1919         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1920         iov.iov_base = req;
1921
1922         rqst.rq_iov = &iov;
1923         rqst.rq_nvec = 1;
1924         rqst.rq_pages = wdata->pages;
1925         rqst.rq_npages = wdata->nr_pages;
1926         rqst.rq_pagesz = wdata->pagesz;
1927         rqst.rq_tailsz = wdata->tailsz;
1928
1929         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1930                  wdata->offset, wdata->bytes);
1931
1932         req->Length = cpu_to_le32(wdata->bytes);
1933
1934         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1935
1936         kref_get(&wdata->refcount);
1937         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1938                                 smb2_writev_callback, wdata, 0);
1939
1940         if (rc) {
1941                 kref_put(&wdata->refcount, cifs_writedata_release);
1942                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1943         }
1944
1945 async_writev_out:
1946         cifs_small_buf_release(req);
1947         return rc;
1948 }
1949
1950 /*
1951  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1952  * The length field from io_parms must be at least 1 and indicates a number of
1953  * elements with data to write that begins with position 1 in iov array. All
1954  * data length is specified by count.
1955  */
1956 int
1957 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1958            unsigned int *nbytes, struct kvec *iov, int n_vec)
1959 {
1960         int rc = 0;
1961         struct smb2_write_req *req = NULL;
1962         struct smb2_write_rsp *rsp = NULL;
1963         int resp_buftype;
1964         *nbytes = 0;
1965
1966         if (n_vec < 1)
1967                 return rc;
1968
1969         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1970         if (rc)
1971                 return rc;
1972
1973         if (io_parms->tcon->ses->server == NULL)
1974                 return -ECONNABORTED;
1975
1976         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1977
1978         req->PersistentFileId = io_parms->persistent_fid;
1979         req->VolatileFileId = io_parms->volatile_fid;
1980         req->WriteChannelInfoOffset = 0;
1981         req->WriteChannelInfoLength = 0;
1982         req->Channel = 0;
1983         req->Length = cpu_to_le32(io_parms->length);
1984         req->Offset = cpu_to_le64(io_parms->offset);
1985         /* 4 for rfc1002 length field */
1986         req->DataOffset = cpu_to_le16(
1987                                 offsetof(struct smb2_write_req, Buffer) - 4);
1988         req->RemainingBytes = 0;
1989
1990         iov[0].iov_base = (char *)req;
1991         /* 4 for rfc1002 length field and 1 for Buffer */
1992         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1993
1994         /* length of entire message including data to be written */
1995         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1996
1997         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1998                           &resp_buftype, 0);
1999         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2000
2001         if (rc) {
2002                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2003                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2004         } else
2005                 *nbytes = le32_to_cpu(rsp->DataLength);
2006
2007         free_rsp_buf(resp_buftype, rsp);
2008         return rc;
2009 }
2010
2011 static unsigned int
2012 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2013 {
2014         int len;
2015         unsigned int entrycount = 0;
2016         unsigned int next_offset = 0;
2017         FILE_DIRECTORY_INFO *entryptr;
2018
2019         if (bufstart == NULL)
2020                 return 0;
2021
2022         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2023
2024         while (1) {
2025                 entryptr = (FILE_DIRECTORY_INFO *)
2026                                         ((char *)entryptr + next_offset);
2027
2028                 if ((char *)entryptr + size > end_of_buf) {
2029                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2030                         break;
2031                 }
2032
2033                 len = le32_to_cpu(entryptr->FileNameLength);
2034                 if ((char *)entryptr + len + size > end_of_buf) {
2035                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2036                                  end_of_buf);
2037                         break;
2038                 }
2039
2040                 *lastentry = (char *)entryptr;
2041                 entrycount++;
2042
2043                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2044                 if (!next_offset)
2045                         break;
2046         }
2047
2048         return entrycount;
2049 }
2050
2051 /*
2052  * Readdir/FindFirst
2053  */
2054 int
2055 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2056                      u64 persistent_fid, u64 volatile_fid, int index,
2057                      struct cifs_search_info *srch_inf)
2058 {
2059         struct smb2_query_directory_req *req;
2060         struct smb2_query_directory_rsp *rsp = NULL;
2061         struct kvec iov[2];
2062         int rc = 0;
2063         int len;
2064         int resp_buftype;
2065         unsigned char *bufptr;
2066         struct TCP_Server_Info *server;
2067         struct cifs_ses *ses = tcon->ses;
2068         __le16 asteriks = cpu_to_le16('*');
2069         char *end_of_smb;
2070         unsigned int output_size = CIFSMaxBufSize;
2071         size_t info_buf_size;
2072
2073         if (ses && (ses->server))
2074                 server = ses->server;
2075         else
2076                 return -EIO;
2077
2078         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2079         if (rc)
2080                 return rc;
2081
2082         switch (srch_inf->info_level) {
2083         case SMB_FIND_FILE_DIRECTORY_INFO:
2084                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2085                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2086                 break;
2087         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2088                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2089                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2090                 break;
2091         default:
2092                 cifs_dbg(VFS, "info level %u isn't supported\n",
2093                          srch_inf->info_level);
2094                 rc = -EINVAL;
2095                 goto qdir_exit;
2096         }
2097
2098         req->FileIndex = cpu_to_le32(index);
2099         req->PersistentFileId = persistent_fid;
2100         req->VolatileFileId = volatile_fid;
2101
2102         len = 0x2;
2103         bufptr = req->Buffer;
2104         memcpy(bufptr, &asteriks, len);
2105
2106         req->FileNameOffset =
2107                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2108         req->FileNameLength = cpu_to_le16(len);
2109         /*
2110          * BB could be 30 bytes or so longer if we used SMB2 specific
2111          * buffer lengths, but this is safe and close enough.
2112          */
2113         output_size = min_t(unsigned int, output_size, server->maxBuf);
2114         output_size = min_t(unsigned int, output_size, 2 << 15);
2115         req->OutputBufferLength = cpu_to_le32(output_size);
2116
2117         iov[0].iov_base = (char *)req;
2118         /* 4 for RFC1001 length and 1 for Buffer */
2119         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2120
2121         iov[1].iov_base = (char *)(req->Buffer);
2122         iov[1].iov_len = len;
2123
2124         inc_rfc1001_len(req, len - 1 /* Buffer */);
2125
2126         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2127         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2128
2129         if (rc) {
2130                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2131                 goto qdir_exit;
2132         }
2133
2134         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2135                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2136                           info_buf_size);
2137         if (rc)
2138                 goto qdir_exit;
2139
2140         srch_inf->unicode = true;
2141
2142         if (srch_inf->ntwrk_buf_start) {
2143                 if (srch_inf->smallBuf)
2144                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2145                 else
2146                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2147         }
2148         srch_inf->ntwrk_buf_start = (char *)rsp;
2149         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2150                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2151         /* 4 for rfc1002 length field */
2152         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2153         srch_inf->entries_in_buffer =
2154                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2155                                     &srch_inf->last_entry, info_buf_size);
2156         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2157         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2158                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2159                  srch_inf->srch_entries_start, srch_inf->last_entry);
2160         if (resp_buftype == CIFS_LARGE_BUFFER)
2161                 srch_inf->smallBuf = false;
2162         else if (resp_buftype == CIFS_SMALL_BUFFER)
2163                 srch_inf->smallBuf = true;
2164         else
2165                 cifs_dbg(VFS, "illegal search buffer type\n");
2166
2167         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2168                 srch_inf->endOfSearch = 1;
2169         else
2170                 srch_inf->endOfSearch = 0;
2171
2172         return rc;
2173
2174 qdir_exit:
2175         free_rsp_buf(resp_buftype, rsp);
2176         return rc;
2177 }
2178
2179 static int
2180 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2181                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2182                unsigned int num, void **data, unsigned int *size)
2183 {
2184         struct smb2_set_info_req *req;
2185         struct smb2_set_info_rsp *rsp = NULL;
2186         struct kvec *iov;
2187         int rc = 0;
2188         int resp_buftype;
2189         unsigned int i;
2190         struct TCP_Server_Info *server;
2191         struct cifs_ses *ses = tcon->ses;
2192
2193         if (ses && (ses->server))
2194                 server = ses->server;
2195         else
2196                 return -EIO;
2197
2198         if (!num)
2199                 return -EINVAL;
2200
2201         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2202         if (!iov)
2203                 return -ENOMEM;
2204
2205         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2206         if (rc) {
2207                 kfree(iov);
2208                 return rc;
2209         }
2210
2211         req->hdr.ProcessId = cpu_to_le32(pid);
2212
2213         req->InfoType = SMB2_O_INFO_FILE;
2214         req->FileInfoClass = info_class;
2215         req->PersistentFileId = persistent_fid;
2216         req->VolatileFileId = volatile_fid;
2217
2218         /* 4 for RFC1001 length and 1 for Buffer */
2219         req->BufferOffset =
2220                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2221         req->BufferLength = cpu_to_le32(*size);
2222
2223         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2224
2225         memcpy(req->Buffer, *data, *size);
2226
2227         iov[0].iov_base = (char *)req;
2228         /* 4 for RFC1001 length */
2229         iov[0].iov_len = get_rfc1002_length(req) + 4;
2230
2231         for (i = 1; i < num; i++) {
2232                 inc_rfc1001_len(req, size[i]);
2233                 le32_add_cpu(&req->BufferLength, size[i]);
2234                 iov[i].iov_base = (char *)data[i];
2235                 iov[i].iov_len = size[i];
2236         }
2237
2238         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2239         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2240
2241         if (rc != 0)
2242                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2243
2244         free_rsp_buf(resp_buftype, rsp);
2245         kfree(iov);
2246         return rc;
2247 }
2248
2249 int
2250 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2251             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2252 {
2253         struct smb2_file_rename_info info;
2254         void **data;
2255         unsigned int size[2];
2256         int rc;
2257         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2258
2259         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2260         if (!data)
2261                 return -ENOMEM;
2262
2263         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2264                               /* 0 = fail if target already exists */
2265         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2266         info.FileNameLength = cpu_to_le32(len);
2267
2268         data[0] = &info;
2269         size[0] = sizeof(struct smb2_file_rename_info);
2270
2271         data[1] = target_file;
2272         size[1] = len + 2 /* null */;
2273
2274         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2275                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2276                            size);
2277         kfree(data);
2278         return rc;
2279 }
2280
2281 int
2282 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2283                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2284 {
2285         struct smb2_file_link_info info;
2286         void **data;
2287         unsigned int size[2];
2288         int rc;
2289         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2290
2291         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2292         if (!data)
2293                 return -ENOMEM;
2294
2295         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2296                               /* 0 = fail if link already exists */
2297         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2298         info.FileNameLength = cpu_to_le32(len);
2299
2300         data[0] = &info;
2301         size[0] = sizeof(struct smb2_file_link_info);
2302
2303         data[1] = target_file;
2304         size[1] = len + 2 /* null */;
2305
2306         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2307                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2308         kfree(data);
2309         return rc;
2310 }
2311
2312 int
2313 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2314              u64 volatile_fid, u32 pid, __le64 *eof)
2315 {
2316         struct smb2_file_eof_info info;
2317         void *data;
2318         unsigned int size;
2319
2320         info.EndOfFile = *eof;
2321
2322         data = &info;
2323         size = sizeof(struct smb2_file_eof_info);
2324
2325         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2326                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2327 }
2328
2329 int
2330 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2331               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2332 {
2333         unsigned int size;
2334         size = sizeof(FILE_BASIC_INFO);
2335         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2336                              current->tgid, FILE_BASIC_INFORMATION, 1,
2337                              (void **)&buf, &size);
2338 }
2339
2340 int
2341 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2342                   const u64 persistent_fid, const u64 volatile_fid,
2343                   __u8 oplock_level)
2344 {
2345         int rc;
2346         struct smb2_oplock_break *req = NULL;
2347
2348         cifs_dbg(FYI, "SMB2_oplock_break\n");
2349         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2350
2351         if (rc)
2352                 return rc;
2353
2354         req->VolatileFid = volatile_fid;
2355         req->PersistentFid = persistent_fid;
2356         req->OplockLevel = oplock_level;
2357         req->hdr.CreditRequest = cpu_to_le16(1);
2358
2359         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2360         /* SMB2 buffer freed by function above */
2361
2362         if (rc) {
2363                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2364                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2365         }
2366
2367         return rc;
2368 }
2369
2370 static void
2371 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2372                         struct kstatfs *kst)
2373 {
2374         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2375                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2376         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2377         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2378         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2379         return;
2380 }
2381
2382 static int
2383 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2384                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2385 {
2386         int rc;
2387         struct smb2_query_info_req *req;
2388
2389         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2390
2391         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2392                 return -EIO;
2393
2394         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2395         if (rc)
2396                 return rc;
2397
2398         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2399         req->FileInfoClass = level;
2400         req->PersistentFileId = persistent_fid;
2401         req->VolatileFileId = volatile_fid;
2402         /* 4 for rfc1002 length field and 1 for pad */
2403         req->InputBufferOffset =
2404                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2405         req->OutputBufferLength = cpu_to_le32(
2406                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2407
2408         iov->iov_base = (char *)req;
2409         /* 4 for rfc1002 length field */
2410         iov->iov_len = get_rfc1002_length(req) + 4;
2411         return 0;
2412 }
2413
2414 int
2415 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2416               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2417 {
2418         struct smb2_query_info_rsp *rsp = NULL;
2419         struct kvec iov;
2420         int rc = 0;
2421         int resp_buftype;
2422         struct cifs_ses *ses = tcon->ses;
2423         struct smb2_fs_full_size_info *info = NULL;
2424
2425         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2426                                 sizeof(struct smb2_fs_full_size_info),
2427                                 persistent_fid, volatile_fid);
2428         if (rc)
2429                 return rc;
2430
2431         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2432         if (rc) {
2433                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2434                 goto qfsinf_exit;
2435         }
2436         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2437
2438         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2439                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2440         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2441                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2442                           sizeof(struct smb2_fs_full_size_info));
2443         if (!rc)
2444                 copy_fs_info_to_kstatfs(info, fsdata);
2445
2446 qfsinf_exit:
2447         free_rsp_buf(resp_buftype, iov.iov_base);
2448         return rc;
2449 }
2450
2451 int
2452 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2453               u64 persistent_fid, u64 volatile_fid, int level)
2454 {
2455         struct smb2_query_info_rsp *rsp = NULL;
2456         struct kvec iov;
2457         int rc = 0;
2458         int resp_buftype, max_len, min_len;
2459         struct cifs_ses *ses = tcon->ses;
2460         unsigned int rsp_len, offset;
2461
2462         if (level == FS_DEVICE_INFORMATION) {
2463                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2464                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2465         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2466                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2467                 min_len = MIN_FS_ATTR_INFO_SIZE;
2468         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2469                 max_len = sizeof(struct smb3_fs_ss_info);
2470                 min_len = sizeof(struct smb3_fs_ss_info);
2471         } else {
2472                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2473                 return -EINVAL;
2474         }
2475
2476         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2477                                 persistent_fid, volatile_fid);
2478         if (rc)
2479                 return rc;
2480
2481         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2482         if (rc) {
2483                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2484                 goto qfsattr_exit;
2485         }
2486         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2487
2488         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2489         offset = le16_to_cpu(rsp->OutputBufferOffset);
2490         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2491         if (rc)
2492                 goto qfsattr_exit;
2493
2494         if (level == FS_ATTRIBUTE_INFORMATION)
2495                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2496                         + (char *)&rsp->hdr, min_t(unsigned int,
2497                         rsp_len, max_len));
2498         else if (level == FS_DEVICE_INFORMATION)
2499                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2500                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2501         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2502                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2503                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2504                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2505                 tcon->perf_sector_size =
2506                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2507         }
2508
2509 qfsattr_exit:
2510         free_rsp_buf(resp_buftype, iov.iov_base);
2511         return rc;
2512 }
2513
2514 int
2515 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2516            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2517            const __u32 num_lock, struct smb2_lock_element *buf)
2518 {
2519         int rc = 0;
2520         struct smb2_lock_req *req = NULL;
2521         struct kvec iov[2];
2522         int resp_buf_type;
2523         unsigned int count;
2524
2525         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2526
2527         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2528         if (rc)
2529                 return rc;
2530
2531         req->hdr.ProcessId = cpu_to_le32(pid);
2532         req->LockCount = cpu_to_le16(num_lock);
2533
2534         req->PersistentFileId = persist_fid;
2535         req->VolatileFileId = volatile_fid;
2536
2537         count = num_lock * sizeof(struct smb2_lock_element);
2538         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2539
2540         iov[0].iov_base = (char *)req;
2541         /* 4 for rfc1002 length field and count for all locks */
2542         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2543         iov[1].iov_base = (char *)buf;
2544         iov[1].iov_len = count;
2545
2546         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2547         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2548         if (rc) {
2549                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2550                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2551         }
2552
2553         return rc;
2554 }
2555
2556 int
2557 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2558           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2559           const __u64 length, const __u64 offset, const __u32 lock_flags,
2560           const bool wait)
2561 {
2562         struct smb2_lock_element lock;
2563
2564         lock.Offset = cpu_to_le64(offset);
2565         lock.Length = cpu_to_le64(length);
2566         lock.Flags = cpu_to_le32(lock_flags);
2567         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2568                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2569
2570         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2571 }
2572
2573 int
2574 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2575                  __u8 *lease_key, const __le32 lease_state)
2576 {
2577         int rc;
2578         struct smb2_lease_ack *req = NULL;
2579
2580         cifs_dbg(FYI, "SMB2_lease_break\n");
2581         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2582
2583         if (rc)
2584                 return rc;
2585
2586         req->hdr.CreditRequest = cpu_to_le16(1);
2587         req->StructureSize = cpu_to_le16(36);
2588         inc_rfc1001_len(req, 12);
2589
2590         memcpy(req->LeaseKey, lease_key, 16);
2591         req->LeaseState = lease_state;
2592
2593         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2594         /* SMB2 buffer freed by function above */
2595
2596         if (rc) {
2597                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2598                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2599         }
2600
2601         return rc;
2602 }