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         /* set it to the maximum buffer size value we can send with 1 credit */
 417         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 418                                SMB2_MAX_BUFFER_SIZE);
 419         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 420         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 421         /* BB Do we need to validate the SecurityMode? */
 422         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 423         server->capabilities = le32_to_cpu(rsp->Capabilities);
 424         /* Internal types */
 425         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 426
 427         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 428                                                &rsp->hdr);
 429         /*
 430          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 431          * for us will be
 432          *      ses->sectype = RawNTLMSSP;
 433          * but for time being this is our only auth choice so doesn't matter.
 434          * We just found a server which sets blob length to zero expecting raw.
 435          */
 436         if (blob_length == 0)
 437                 cifs_dbg(FYI, "missing security blob on negprot\n");
 438
 439         rc = cifs_enable_signing(server, ses->sign);
 440 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 441         if (rc)
 442                 goto neg_exit;
 443         if (blob_length)
 444                 rc = decode_neg_token_init(security_blob, blob_length,
 445                                    &server->sec_type);
 446         if (rc == 1)
 447                 rc = 0;
 448         else if (rc == 0) {
 449                 rc = -EIO;
 450                 goto neg_exit;
 451         }
 452 #endif
 453
 454 neg_exit:
 455         free_rsp_buf(resp_buftype, rsp);
 456         return rc;
 457 }
 458
 459 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 460 {
 461         int rc = 0;
 462         struct validate_negotiate_info_req vneg_inbuf;
 463         struct validate_negotiate_info_rsp *pneg_rsp;
 464         u32 rsplen;
 465
 466         cifs_dbg(FYI, "validate negotiate\n");
 467
 468         /*
 469          * validation ioctl must be signed, so no point sending this if we
 470          * can not sign it.  We could eventually change this to selectively
 471          * sign just this, the first and only signed request on a connection.
 472          * This is good enough for now since a user who wants better security
 473          * would also enable signing on the mount. Having validation of
 474          * negotiate info for signed connections helps reduce attack vectors
 475          */
 476         if (tcon->ses->server->sign == false)
 477                 return 0; /* validation requires signing */
 478
 479         vneg_inbuf.Capabilities =
 480                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 481         memcpy(vneg_inbuf.Guid, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 482
 483         if (tcon->ses->sign)
 484                 vneg_inbuf.SecurityMode =
 485                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 486         else if (global_secflags & CIFSSEC_MAY_SIGN)
 487                 vneg_inbuf.SecurityMode =
 488                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 489         else
 490                 vneg_inbuf.SecurityMode = 0;
 491
 492         vneg_inbuf.DialectCount = cpu_to_le16(1);
 493         vneg_inbuf.Dialects[0] =
 494                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 495
 496         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 497                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 498                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 499                 (char **)&pneg_rsp, &rsplen);
 500
 501         if (rc != 0) {
 502                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 503                 return -EIO;
 504         }
 505
 506         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 507                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 508                 return -EIO;
 509         }
 510
 511         /* check validate negotiate info response matches what we got earlier */
 512         if (pneg_rsp->Dialect !=
 513                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 514                 goto vneg_out;
 515
 516         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 517                 goto vneg_out;
 518
 519         /* do not validate server guid because not saved at negprot time yet */
 520
 521         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 522               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 523                 goto vneg_out;
 524
 525         /* validate negotiate successful */
 526         cifs_dbg(FYI, "validate negotiate info successful\n");
 527         return 0;
 528
 529 vneg_out:
 530         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 531         return -EIO;
 532 }
 533
 534 int
 535 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 536                 const struct nls_table *nls_cp)
 537 {
 538         struct smb2_sess_setup_req *req;
 539         struct smb2_sess_setup_rsp *rsp = NULL;
 540         struct kvec iov[2];
 541         int rc = 0;
 542         int resp_buftype;
 543         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 544         struct TCP_Server_Info *server = ses->server;
 545         u16 blob_length = 0;
 546         char *security_blob;
 547         char *ntlmssp_blob = NULL;
 548         bool use_spnego = false; /* else use raw ntlmssp */
 549
 550         cifs_dbg(FYI, "Session Setup\n");
 551
 552         if (!server) {
 553                 WARN(1, "%s: server is NULL!\n", __func__);
 554                 return -EIO;
 555         }
 556
 557         /*
 558          * If we are here due to reconnect, free per-smb session key
 559          * in case signing was required.
 560          */
 561         kfree(ses->auth_key.response);
 562         ses->auth_key.response = NULL;
 563
 564         /*
 565          * If memory allocation is successful, caller of this function
 566          * frees it.
 567          */
 568         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 569         if (!ses->ntlmssp)
 570                 return -ENOMEM;
 571         ses->ntlmssp->sesskey_per_smbsess = true;
 572
 573         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 574         ses->sectype = RawNTLMSSP;
 575
 576 ssetup_ntlmssp_authenticate:
 577         if (phase == NtLmChallenge)
 578                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 579
 580         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 581         if (rc)
 582                 return rc;
 583
 584         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 585         req->VcNumber = 0; /* MBZ */
 586         /* to enable echos and oplocks */
 587         req->hdr.CreditRequest = cpu_to_le16(3);
 588
 589         /* only one of SMB2 signing flags may be set in SMB2 request */
 590         if (server->sign)
 591                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 592         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 593                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 594         else
 595                 req->SecurityMode = 0;
 596
 597         req->Capabilities = 0;
 598         req->Channel = 0; /* MBZ */
 599
 600         iov[0].iov_base = (char *)req;
 601         /* 4 for rfc1002 length field and 1 for pad */
 602         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 603         if (phase == NtLmNegotiate) {
 604                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 605                                        GFP_KERNEL);
 606                 if (ntlmssp_blob == NULL) {
 607                         rc = -ENOMEM;
 608                         goto ssetup_exit;
 609                 }
 610                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 611                 if (use_spnego) {
 612                         /* blob_length = build_spnego_ntlmssp_blob(
 613                                         &security_blob,
 614                                         sizeof(struct _NEGOTIATE_MESSAGE),
 615                                         ntlmssp_blob); */
 616                         /* BB eventually need to add this */
 617                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 618                         rc = -EOPNOTSUPP;
 619                         kfree(ntlmssp_blob);
 620                         goto ssetup_exit;
 621                 } else {
 622                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 623                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 624                         security_blob = ntlmssp_blob;
 625                 }
 626         } else if (phase == NtLmAuthenticate) {
 627                 req->hdr.SessionId = ses->Suid;
 628                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 629                                        GFP_KERNEL);
 630                 if (ntlmssp_blob == NULL) {
 631                         rc = -ENOMEM;
 632                         goto ssetup_exit;
 633                 }
 634                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 635                                              nls_cp);
 636                 if (rc) {
 637                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 638                                  rc);
 639                         goto ssetup_exit; /* BB double check error handling */
 640                 }
 641                 if (use_spnego) {
 642                         /* blob_length = build_spnego_ntlmssp_blob(
 643                                                         &security_blob,
 644                                                         blob_length,
 645                                                         ntlmssp_blob); */
 646                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 647                         rc = -EOPNOTSUPP;
 648                         kfree(ntlmssp_blob);
 649                         goto ssetup_exit;
 650                 } else {
 651                         security_blob = ntlmssp_blob;
 652                 }
 653         } else {
 654                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 655                 rc = -EIO;
 656                 goto ssetup_exit;
 657         }
 658
 659         /* Testing shows that buffer offset must be at location of Buffer[0] */
 660         req->SecurityBufferOffset =
 661                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 662                                             1 /* pad */ - 4 /* rfc1001 len */);
 663         req->SecurityBufferLength = cpu_to_le16(blob_length);
 664         iov[1].iov_base = security_blob;
 665         iov[1].iov_len = blob_length;
 666
 667         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 668
 669         /* BB add code to build os and lm fields */
 670
 671         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 672                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 673
 674         kfree(security_blob);
 675         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 676         if (resp_buftype != CIFS_NO_BUFFER &&
 677             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 678                 if (phase != NtLmNegotiate) {
 679                         cifs_dbg(VFS, "Unexpected more processing error\n");
 680                         goto ssetup_exit;
 681                 }
 682                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 683                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 684                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 685                                  le16_to_cpu(rsp->SecurityBufferOffset));
 686                         rc = -EIO;
 687                         goto ssetup_exit;
 688                 }
 689
 690                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 691                 phase = NtLmChallenge; /* process ntlmssp challenge */
 692                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 693                 ses->Suid = rsp->hdr.SessionId;
 694                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 695                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 696         }
 697
 698         /*
 699          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 700          * but at least the raw NTLMSSP case works.
 701          */
 702         /*
 703          * No tcon so can't do
 704          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 705          */
 706         if (rc != 0)
 707                 goto ssetup_exit;
 708
 709         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 710         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 711                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 712 ssetup_exit:
 713         free_rsp_buf(resp_buftype, rsp);
 714
 715         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 716         if ((phase == NtLmChallenge) && (rc == 0))
 717                 goto ssetup_ntlmssp_authenticate;
 718
 719         if (!rc) {
 720                 mutex_lock(&server->srv_mutex);
 721                 if (server->sign && server->ops->generate_signingkey) {
 722                         rc = server->ops->generate_signingkey(ses);
 723                         kfree(ses->auth_key.response);
 724                         ses->auth_key.response = NULL;
 725                         if (rc) {
 726                                 cifs_dbg(FYI,
 727                                         "SMB3 session key generation failed\n");
 728                                 mutex_unlock(&server->srv_mutex);
 729                                 goto keygen_exit;
 730                         }
 731                 }
 732                 if (!server->session_estab) {
 733                         server->sequence_number = 0x2;
 734                         server->session_estab = true;
 735                 }
 736                 mutex_unlock(&server->srv_mutex);
 737
 738                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 739                 spin_lock(&GlobalMid_Lock);
 740                 ses->status = CifsGood;
 741                 ses->need_reconnect = false;
 742                 spin_unlock(&GlobalMid_Lock);
 743         }
 744
 745 keygen_exit:
 746         if (!server->sign) {
 747                 kfree(ses->auth_key.response);
 748                 ses->auth_key.response = NULL;
 749         }
 750         kfree(ses->ntlmssp);
 751
 752         return rc;
 753 }
 754
 755 int
 756 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 757 {
 758         struct smb2_logoff_req *req; /* response is also trivial struct */
 759         int rc = 0;
 760         struct TCP_Server_Info *server;
 761
 762         cifs_dbg(FYI, "disconnect session %p\n", ses);
 763
 764         if (ses && (ses->server))
 765                 server = ses->server;
 766         else
 767                 return -EIO;
 768
 769         /* no need to send SMB logoff if uid already closed due to reconnect */
 770         if (ses->need_reconnect)
 771                 goto smb2_session_already_dead;
 772
 773         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 774         if (rc)
 775                 return rc;
 776
 777          /* since no tcon, smb2_init can not do this, so do here */
 778         req->hdr.SessionId = ses->Suid;
 779         if (server->sign)
 780                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 781
 782         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 783         /*
 784          * No tcon so can't do
 785          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 786          */
 787
 788 smb2_session_already_dead:
 789         return rc;
 790 }
 791
 792 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 793 {
 794         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 795 }
 796
 797 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 798
 799 /* These are similar values to what Windows uses */
 800 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 801 {
 802         tcon->max_chunks = 256;
 803         tcon->max_bytes_chunk = 1048576;
 804         tcon->max_bytes_copy = 16777216;
 805 }
 806
 807 int
 808 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 809           struct cifs_tcon *tcon, const struct nls_table *cp)
 810 {
 811         struct smb2_tree_connect_req *req;
 812         struct smb2_tree_connect_rsp *rsp = NULL;
 813         struct kvec iov[2];
 814         int rc = 0;
 815         int resp_buftype;
 816         int unc_path_len;
 817         struct TCP_Server_Info *server;
 818         __le16 *unc_path = NULL;
 819
 820         cifs_dbg(FYI, "TCON\n");
 821
 822         if ((ses->server) && tree)
 823                 server = ses->server;
 824         else
 825                 return -EIO;
 826
 827         if (tcon && tcon->bad_network_name)
 828                 return -ENOENT;
 829
 830         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 831         if (unc_path == NULL)
 832                 return -ENOMEM;
 833
 834         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 835         unc_path_len *= 2;
 836         if (unc_path_len < 2) {
 837                 kfree(unc_path);
 838                 return -EINVAL;
 839         }
 840
 841         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 842         if (rc) {
 843                 kfree(unc_path);
 844                 return rc;
 845         }
 846
 847         if (tcon == NULL) {
 848                 /* since no tcon, smb2_init can not do this, so do here */
 849                 req->hdr.SessionId = ses->Suid;
 850                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 851                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 852         }
 853
 854         iov[0].iov_base = (char *)req;
 855         /* 4 for rfc1002 length field and 1 for pad */
 856         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 857
 858         /* Testing shows that buffer offset must be at location of Buffer[0] */
 859         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 860                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 861         req->PathLength = cpu_to_le16(unc_path_len - 2);
 862         iov[1].iov_base = unc_path;
 863         iov[1].iov_len = unc_path_len;
 864
 865         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 866
 867         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 868         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 869
 870         if (rc != 0) {
 871                 if (tcon) {
 872                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 873                         tcon->need_reconnect = true;
 874                 }
 875                 goto tcon_error_exit;
 876         }
 877
 878         if (tcon == NULL) {
 879                 ses->ipc_tid = rsp->hdr.TreeId;
 880                 goto tcon_exit;
 881         }
 882
 883         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 884                 cifs_dbg(FYI, "connection to disk share\n");
 885         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 886                 tcon->ipc = true;
 887                 cifs_dbg(FYI, "connection to pipe share\n");
 888         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 889                 tcon->print = true;
 890                 cifs_dbg(FYI, "connection to printer\n");
 891         } else {
 892                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 893                 rc = -EOPNOTSUPP;
 894                 goto tcon_error_exit;
 895         }
 896
 897         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 898         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 899         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 900         tcon->tidStatus = CifsGood;
 901         tcon->need_reconnect = false;
 902         tcon->tid = rsp->hdr.TreeId;
 903         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 904
 905         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 906             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 907                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 908         init_copy_chunk_defaults(tcon);
 909         if (tcon->ses->server->ops->validate_negotiate)
 910                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 911 tcon_exit:
 912         free_rsp_buf(resp_buftype, rsp);
 913         kfree(unc_path);
 914         return rc;
 915
 916 tcon_error_exit:
 917         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 918                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 919                 if (tcon)
 920                         tcon->bad_network_name = true;
 921         }
 922         goto tcon_exit;
 923 }
 924
 925 int
 926 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 927 {
 928         struct smb2_tree_disconnect_req *req; /* response is trivial */
 929         int rc = 0;
 930         struct TCP_Server_Info *server;
 931         struct cifs_ses *ses = tcon->ses;
 932
 933         cifs_dbg(FYI, "Tree Disconnect\n");
 934
 935         if (ses && (ses->server))
 936                 server = ses->server;
 937         else
 938                 return -EIO;
 939
 940         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 941                 return 0;
 942
 943         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 944         if (rc)
 945                 return rc;
 946
 947         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 948         if (rc)
 949                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 950
 951         return rc;
 952 }
 953
 954
 955 static struct create_durable *
 956 create_durable_buf(void)
 957 {
 958         struct create_durable *buf;
 959
 960         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 961         if (!buf)
 962                 return NULL;
 963
 964         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 965                                         (struct create_durable, Data));
 966         buf->ccontext.DataLength = cpu_to_le32(16);
 967         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 968                                 (struct create_durable, Name));
 969         buf->ccontext.NameLength = cpu_to_le16(4);
 970         buf->Name[0] = 'D';
 971         buf->Name[1] = 'H';
 972         buf->Name[2] = 'n';
 973         buf->Name[3] = 'Q';
 974         return buf;
 975 }
 976
 977 static struct create_durable *
 978 create_reconnect_durable_buf(struct cifs_fid *fid)
 979 {
 980         struct create_durable *buf;
 981
 982         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 983         if (!buf)
 984                 return NULL;
 985
 986         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 987                                         (struct create_durable, Data));
 988         buf->ccontext.DataLength = cpu_to_le32(16);
 989         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 990                                 (struct create_durable, Name));
 991         buf->ccontext.NameLength = cpu_to_le16(4);
 992         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 993         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 994         buf->Name[0] = 'D';
 995         buf->Name[1] = 'H';
 996         buf->Name[2] = 'n';
 997         buf->Name[3] = 'C';
 998         return buf;
 999 }
1000
1001 static __u8
1002 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1003                   unsigned int *epoch)
1004 {
1005         char *data_offset;
1006         struct create_context *cc;
1007         unsigned int next = 0;
1008         char *name;
1009
1010         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1011         cc = (struct create_context *)data_offset;
1012         do {
1013                 cc = (struct create_context *)((char *)cc + next);
1014                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1015                 if (le16_to_cpu(cc->NameLength) != 4 ||
1016                     strncmp(name, "RqLs", 4)) {
1017                         next = le32_to_cpu(cc->Next);
1018                         continue;
1019                 }
1020                 return server->ops->parse_lease_buf(cc, epoch);
1021         } while (next != 0);
1022
1023         return 0;
1024 }
1025
1026 static int
1027 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1028                   unsigned int *num_iovec, __u8 *oplock)
1029 {
1030         struct smb2_create_req *req = iov[0].iov_base;
1031         unsigned int num = *num_iovec;
1032
1033         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1034         if (iov[num].iov_base == NULL)
1035                 return -ENOMEM;
1036         iov[num].iov_len = server->vals->create_lease_size;
1037         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1038         if (!req->CreateContextsOffset)
1039                 req->CreateContextsOffset = cpu_to_le32(
1040                                 sizeof(struct smb2_create_req) - 4 +
1041                                 iov[num - 1].iov_len);
1042         le32_add_cpu(&req->CreateContextsLength,
1043                      server->vals->create_lease_size);
1044         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1045         *num_iovec = num + 1;
1046         return 0;
1047 }
1048
1049 static int
1050 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1051                     struct cifs_open_parms *oparms)
1052 {
1053         struct smb2_create_req *req = iov[0].iov_base;
1054         unsigned int num = *num_iovec;
1055
1056         if (oparms->reconnect) {
1057                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1058                 /* indicate that we don't need to relock the file */
1059                 oparms->reconnect = false;
1060         } else
1061                 iov[num].iov_base = create_durable_buf();
1062         if (iov[num].iov_base == NULL)
1063                 return -ENOMEM;
1064         iov[num].iov_len = sizeof(struct create_durable);
1065         if (!req->CreateContextsOffset)
1066                 req->CreateContextsOffset =
1067                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1068                                                                 iov[1].iov_len);
1069         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1070         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1071         *num_iovec = num + 1;
1072         return 0;
1073 }
1074
1075 int
1076 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1077           __u8 *oplock, struct smb2_file_all_info *buf,
1078           struct smb2_err_rsp **err_buf)
1079 {
1080         struct smb2_create_req *req;
1081         struct smb2_create_rsp *rsp;
1082         struct TCP_Server_Info *server;
1083         struct cifs_tcon *tcon = oparms->tcon;
1084         struct cifs_ses *ses = tcon->ses;
1085         struct kvec iov[4];
1086         int resp_buftype;
1087         int uni_path_len;
1088         __le16 *copy_path = NULL;
1089         int copy_size;
1090         int rc = 0;
1091         unsigned int num_iovecs = 2;
1092         __u32 file_attributes = 0;
1093         char *dhc_buf = NULL, *lc_buf = NULL;
1094
1095         cifs_dbg(FYI, "create/open\n");
1096
1097         if (ses && (ses->server))
1098                 server = ses->server;
1099         else
1100                 return -EIO;
1101
1102         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1103         if (rc)
1104                 return rc;
1105
1106         if (oparms->create_options & CREATE_OPTION_READONLY)
1107                 file_attributes |= ATTR_READONLY;
1108
1109         req->ImpersonationLevel = IL_IMPERSONATION;
1110         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1111         /* File attributes ignored on open (used in create though) */
1112         req->FileAttributes = cpu_to_le32(file_attributes);
1113         req->ShareAccess = FILE_SHARE_ALL_LE;
1114         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1115         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1116         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1117         /* do not count rfc1001 len field */
1118         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1119
1120         iov[0].iov_base = (char *)req;
1121         /* 4 for rfc1002 length field */
1122         iov[0].iov_len = get_rfc1002_length(req) + 4;
1123
1124         /* MUST set path len (NameLength) to 0 opening root of share */
1125         req->NameLength = cpu_to_le16(uni_path_len - 2);
1126         /* -1 since last byte is buf[0] which is sent below (path) */
1127         iov[0].iov_len--;
1128         if (uni_path_len % 8 != 0) {
1129                 copy_size = uni_path_len / 8 * 8;
1130                 if (copy_size < uni_path_len)
1131                         copy_size += 8;
1132
1133                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1134                 if (!copy_path)
1135                         return -ENOMEM;
1136                 memcpy((char *)copy_path, (const char *)path,
1137                         uni_path_len);
1138                 uni_path_len = copy_size;
1139                 path = copy_path;
1140         }
1141
1142         iov[1].iov_len = uni_path_len;
1143         iov[1].iov_base = path;
1144         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1145         inc_rfc1001_len(req, uni_path_len - 1);
1146
1147         if (!server->oplocks)
1148                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1149
1150         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1151             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1152                 req->RequestedOplockLevel = *oplock;
1153         else {
1154                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1155                 if (rc) {
1156                         cifs_small_buf_release(req);
1157                         kfree(copy_path);
1158                         return rc;
1159                 }
1160                 lc_buf = iov[num_iovecs-1].iov_base;
1161         }
1162
1163         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1164                 /* need to set Next field of lease context if we request it */
1165                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1166                         struct create_context *ccontext =
1167                             (struct create_context *)iov[num_iovecs-1].iov_base;
1168                         ccontext->Next =
1169                                 cpu_to_le32(server->vals->create_lease_size);
1170                 }
1171                 rc = add_durable_context(iov, &num_iovecs, oparms);
1172                 if (rc) {
1173                         cifs_small_buf_release(req);
1174                         kfree(copy_path);
1175                         kfree(lc_buf);
1176                         return rc;
1177                 }
1178                 dhc_buf = iov[num_iovecs-1].iov_base;
1179         }
1180
1181         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1182         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1183
1184         if (rc != 0) {
1185                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1186                 if (err_buf)
1187                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1188                                            GFP_KERNEL);
1189                 goto creat_exit;
1190         }
1191
1192         oparms->fid->persistent_fid = rsp->PersistentFileId;
1193         oparms->fid->volatile_fid = rsp->VolatileFileId;
1194
1195         if (buf) {
1196                 memcpy(buf, &rsp->CreationTime, 32);
1197                 buf->AllocationSize = rsp->AllocationSize;
1198                 buf->EndOfFile = rsp->EndofFile;
1199                 buf->Attributes = rsp->FileAttributes;
1200                 buf->NumberOfLinks = cpu_to_le32(1);
1201                 buf->DeletePending = 0;
1202         }
1203
1204         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1205                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1206         else
1207                 *oplock = rsp->OplockLevel;
1208 creat_exit:
1209         kfree(copy_path);
1210         kfree(lc_buf);
1211         kfree(dhc_buf);
1212         free_rsp_buf(resp_buftype, rsp);
1213         return rc;
1214 }
1215
1216 /*
1217  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1218  */
1219 int
1220 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1221            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1222            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1223 {
1224         struct smb2_ioctl_req *req;
1225         struct smb2_ioctl_rsp *rsp;
1226         struct TCP_Server_Info *server;
1227         struct cifs_ses *ses = tcon->ses;
1228         struct kvec iov[2];
1229         int resp_buftype;
1230         int num_iovecs;
1231         int rc = 0;
1232
1233         cifs_dbg(FYI, "SMB2 IOCTL\n");
1234
1235         *out_data = NULL;
1236         /* zero out returned data len, in case of error */
1237         if (plen)
1238                 *plen = 0;
1239
1240         if (ses && (ses->server))
1241                 server = ses->server;
1242         else
1243                 return -EIO;
1244
1245         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1246         if (rc)
1247                 return rc;
1248
1249         req->CtlCode = cpu_to_le32(opcode);
1250         req->PersistentFileId = persistent_fid;
1251         req->VolatileFileId = volatile_fid;
1252
1253         if (indatalen) {
1254                 req->InputCount = cpu_to_le32(indatalen);
1255                 /* do not set InputOffset if no input data */
1256                 req->InputOffset =
1257                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1258                 iov[1].iov_base = in_data;
1259                 iov[1].iov_len = indatalen;
1260                 num_iovecs = 2;
1261         } else
1262                 num_iovecs = 1;
1263
1264         req->OutputOffset = 0;
1265         req->OutputCount = 0; /* MBZ */
1266
1267         /*
1268          * Could increase MaxOutputResponse, but that would require more
1269          * than one credit. Windows typically sets this smaller, but for some
1270          * ioctls it may be useful to allow server to send more. No point
1271          * limiting what the server can send as long as fits in one credit
1272          */
1273         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1274
1275         if (is_fsctl)
1276                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1277         else
1278                 req->Flags = 0;
1279
1280         iov[0].iov_base = (char *)req;
1281
1282         /*
1283          * If no input data, the size of ioctl struct in
1284          * protocol spec still includes a 1 byte data buffer,
1285          * but if input data passed to ioctl, we do not
1286          * want to double count this, so we do not send
1287          * the dummy one byte of data in iovec[0] if sending
1288          * input data (in iovec[1]). We also must add 4 bytes
1289          * in first iovec to allow for rfc1002 length field.
1290          */
1291
1292         if (indatalen) {
1293                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1294                 inc_rfc1001_len(req, indatalen - 1);
1295         } else
1296                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1297
1298
1299         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1300         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1301
1302         if ((rc != 0) && (rc != -EINVAL)) {
1303                 if (tcon)
1304                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1305                 goto ioctl_exit;
1306         } else if (rc == -EINVAL) {
1307                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1308                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1309                         if (tcon)
1310                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1311                         goto ioctl_exit;
1312                 }
1313         }
1314
1315         /* check if caller wants to look at return data or just return rc */
1316         if ((plen == NULL) || (out_data == NULL))
1317                 goto ioctl_exit;
1318
1319         *plen = le32_to_cpu(rsp->OutputCount);
1320
1321         /* We check for obvious errors in the output buffer length and offset */
1322         if (*plen == 0)
1323                 goto ioctl_exit; /* server returned no data */
1324         else if (*plen > 0xFF00) {
1325                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1326                 *plen = 0;
1327                 rc = -EIO;
1328                 goto ioctl_exit;
1329         }
1330
1331         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1332                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1333                         le32_to_cpu(rsp->OutputOffset));
1334                 *plen = 0;
1335                 rc = -EIO;
1336                 goto ioctl_exit;
1337         }
1338
1339         *out_data = kmalloc(*plen, GFP_KERNEL);
1340         if (*out_data == NULL) {
1341                 rc = -ENOMEM;
1342                 goto ioctl_exit;
1343         }
1344
1345         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1346                *plen);
1347 ioctl_exit:
1348         free_rsp_buf(resp_buftype, rsp);
1349         return rc;
1350 }
1351
1352 /*
1353  *   Individual callers to ioctl worker function follow
1354  */
1355
1356 int
1357 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1358                      u64 persistent_fid, u64 volatile_fid)
1359 {
1360         int rc;
1361         char *res_key = NULL;
1362         struct  compress_ioctl fsctl_input;
1363         char *ret_data = NULL;
1364
1365         fsctl_input.CompressionState =
1366                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1367
1368         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1369                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1370                         (char *)&fsctl_input /* data input */,
1371                         2 /* in data len */, &ret_data /* out data */, NULL);
1372
1373         cifs_dbg(FYI, "set compression rc %d\n", rc);
1374         kfree(res_key);
1375
1376         return rc;
1377 }
1378
1379 int
1380 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1381            u64 persistent_fid, u64 volatile_fid)
1382 {
1383         struct smb2_close_req *req;
1384         struct smb2_close_rsp *rsp;
1385         struct TCP_Server_Info *server;
1386         struct cifs_ses *ses = tcon->ses;
1387         struct kvec iov[1];
1388         int resp_buftype;
1389         int rc = 0;
1390
1391         cifs_dbg(FYI, "Close\n");
1392
1393         if (ses && (ses->server))
1394                 server = ses->server;
1395         else
1396                 return -EIO;
1397
1398         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1399         if (rc)
1400                 return rc;
1401
1402         req->PersistentFileId = persistent_fid;
1403         req->VolatileFileId = volatile_fid;
1404
1405         iov[0].iov_base = (char *)req;
1406         /* 4 for rfc1002 length field */
1407         iov[0].iov_len = get_rfc1002_length(req) + 4;
1408
1409         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1410         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1411
1412         if (rc != 0) {
1413                 if (tcon)
1414                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1415                 goto close_exit;
1416         }
1417
1418         /* BB FIXME - decode close response, update inode for caching */
1419
1420 close_exit:
1421         free_rsp_buf(resp_buftype, rsp);
1422         return rc;
1423 }
1424
1425 static int
1426 validate_buf(unsigned int offset, unsigned int buffer_length,
1427              struct smb2_hdr *hdr, unsigned int min_buf_size)
1428
1429 {
1430         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1431         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1432         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1433         char *end_of_buf = begin_of_buf + buffer_length;
1434
1435
1436         if (buffer_length < min_buf_size) {
1437                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1438                          buffer_length, min_buf_size);
1439                 return -EINVAL;
1440         }
1441
1442         /* check if beyond RFC1001 maximum length */
1443         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1444                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1445                          buffer_length, smb_len);
1446                 return -EINVAL;
1447         }
1448
1449         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1450                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1451                 return -EINVAL;
1452         }
1453
1454         return 0;
1455 }
1456
1457 /*
1458  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1459  * Caller must free buffer.
1460  */
1461 static int
1462 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1463                       struct smb2_hdr *hdr, unsigned int minbufsize,
1464                       char *data)
1465
1466 {
1467         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1468         int rc;
1469
1470         if (!data)
1471                 return -EINVAL;
1472
1473         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1474         if (rc)
1475                 return rc;
1476
1477         memcpy(data, begin_of_buf, buffer_length);
1478
1479         return 0;
1480 }
1481
1482 static int
1483 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1484            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1485            size_t output_len, size_t min_len, void *data)
1486 {
1487         struct smb2_query_info_req *req;
1488         struct smb2_query_info_rsp *rsp = NULL;
1489         struct kvec iov[2];
1490         int rc = 0;
1491         int resp_buftype;
1492         struct TCP_Server_Info *server;
1493         struct cifs_ses *ses = tcon->ses;
1494
1495         cifs_dbg(FYI, "Query Info\n");
1496
1497         if (ses && (ses->server))
1498                 server = ses->server;
1499         else
1500                 return -EIO;
1501
1502         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1503         if (rc)
1504                 return rc;
1505
1506         req->InfoType = SMB2_O_INFO_FILE;
1507         req->FileInfoClass = info_class;
1508         req->PersistentFileId = persistent_fid;
1509         req->VolatileFileId = volatile_fid;
1510         /* 4 for rfc1002 length field and 1 for Buffer */
1511         req->InputBufferOffset =
1512                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1513         req->OutputBufferLength = cpu_to_le32(output_len);
1514
1515         iov[0].iov_base = (char *)req;
1516         /* 4 for rfc1002 length field */
1517         iov[0].iov_len = get_rfc1002_length(req) + 4;
1518
1519         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1520         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1521
1522         if (rc) {
1523                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1524                 goto qinf_exit;
1525         }
1526
1527         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1528                                    le32_to_cpu(rsp->OutputBufferLength),
1529                                    &rsp->hdr, min_len, data);
1530
1531 qinf_exit:
1532         free_rsp_buf(resp_buftype, rsp);
1533         return rc;
1534 }
1535
1536 int
1537 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1538                 u64 persistent_fid, u64 volatile_fid,
1539                 struct smb2_file_all_info *data)
1540 {
1541         return query_info(xid, tcon, persistent_fid, volatile_fid,
1542                           FILE_ALL_INFORMATION,
1543                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1544                           sizeof(struct smb2_file_all_info), data);
1545 }
1546
1547 int
1548 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1549                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1550 {
1551         return query_info(xid, tcon, persistent_fid, volatile_fid,
1552                           FILE_INTERNAL_INFORMATION,
1553                           sizeof(struct smb2_file_internal_info),
1554                           sizeof(struct smb2_file_internal_info), uniqueid);
1555 }
1556
1557 /*
1558  * This is a no-op for now. We're not really interested in the reply, but
1559  * rather in the fact that the server sent one and that server->lstrp
1560  * gets updated.
1561  *
1562  * FIXME: maybe we should consider checking that the reply matches request?
1563  */
1564 static void
1565 smb2_echo_callback(struct mid_q_entry *mid)
1566 {
1567         struct TCP_Server_Info *server = mid->callback_data;
1568         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1569         unsigned int credits_received = 1;
1570
1571         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1572                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1573
1574         DeleteMidQEntry(mid);
1575         add_credits(server, credits_received, CIFS_ECHO_OP);
1576 }
1577
1578 int
1579 SMB2_echo(struct TCP_Server_Info *server)
1580 {
1581         struct smb2_echo_req *req;
1582         int rc = 0;
1583         struct kvec iov;
1584         struct smb_rqst rqst = { .rq_iov = &iov,
1585                                  .rq_nvec = 1 };
1586
1587         cifs_dbg(FYI, "In echo request\n");
1588
1589         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1590         if (rc)
1591                 return rc;
1592
1593         req->hdr.CreditRequest = cpu_to_le16(1);
1594
1595         iov.iov_base = (char *)req;
1596         /* 4 for rfc1002 length field */
1597         iov.iov_len = get_rfc1002_length(req) + 4;
1598
1599         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1600                              CIFS_ECHO_OP);
1601         if (rc)
1602                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1603
1604         cifs_small_buf_release(req);
1605         return rc;
1606 }
1607
1608 int
1609 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1610            u64 volatile_fid)
1611 {
1612         struct smb2_flush_req *req;
1613         struct TCP_Server_Info *server;
1614         struct cifs_ses *ses = tcon->ses;
1615         struct kvec iov[1];
1616         int resp_buftype;
1617         int rc = 0;
1618
1619         cifs_dbg(FYI, "Flush\n");
1620
1621         if (ses && (ses->server))
1622                 server = ses->server;
1623         else
1624                 return -EIO;
1625
1626         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1627         if (rc)
1628                 return rc;
1629
1630         req->PersistentFileId = persistent_fid;
1631         req->VolatileFileId = volatile_fid;
1632
1633         iov[0].iov_base = (char *)req;
1634         /* 4 for rfc1002 length field */
1635         iov[0].iov_len = get_rfc1002_length(req) + 4;
1636
1637         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1638
1639         if ((rc != 0) && tcon)
1640                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1641
1642         free_rsp_buf(resp_buftype, iov[0].iov_base);
1643         return rc;
1644 }
1645
1646 /*
1647  * To form a chain of read requests, any read requests after the first should
1648  * have the end_of_chain boolean set to true.
1649  */
1650 static int
1651 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1652                   unsigned int remaining_bytes, int request_type)
1653 {
1654         int rc = -EACCES;
1655         struct smb2_read_req *req = NULL;
1656
1657         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1658         if (rc)
1659                 return rc;
1660         if (io_parms->tcon->ses->server == NULL)
1661                 return -ECONNABORTED;
1662
1663         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1664
1665         req->PersistentFileId = io_parms->persistent_fid;
1666         req->VolatileFileId = io_parms->volatile_fid;
1667         req->ReadChannelInfoOffset = 0; /* reserved */
1668         req->ReadChannelInfoLength = 0; /* reserved */
1669         req->Channel = 0; /* reserved */
1670         req->MinimumCount = 0;
1671         req->Length = cpu_to_le32(io_parms->length);
1672         req->Offset = cpu_to_le64(io_parms->offset);
1673
1674         if (request_type & CHAINED_REQUEST) {
1675                 if (!(request_type & END_OF_CHAIN)) {
1676                         /* 4 for rfc1002 length field */
1677                         req->hdr.NextCommand =
1678                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1679                 } else /* END_OF_CHAIN */
1680                         req->hdr.NextCommand = 0;
1681                 if (request_type & RELATED_REQUEST) {
1682                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1683                         /*
1684                          * Related requests use info from previous read request
1685                          * in chain.
1686                          */
1687                         req->hdr.SessionId = 0xFFFFFFFF;
1688                         req->hdr.TreeId = 0xFFFFFFFF;
1689                         req->PersistentFileId = 0xFFFFFFFF;
1690                         req->VolatileFileId = 0xFFFFFFFF;
1691                 }
1692         }
1693         if (remaining_bytes > io_parms->length)
1694                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1695         else
1696                 req->RemainingBytes = 0;
1697
1698         iov[0].iov_base = (char *)req;
1699         /* 4 for rfc1002 length field */
1700         iov[0].iov_len = get_rfc1002_length(req) + 4;
1701         return rc;
1702 }
1703
1704 static void
1705 smb2_readv_callback(struct mid_q_entry *mid)
1706 {
1707         struct cifs_readdata *rdata = mid->callback_data;
1708         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1709         struct TCP_Server_Info *server = tcon->ses->server;
1710         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1711         unsigned int credits_received = 1;
1712         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1713                                  .rq_nvec = 1,
1714                                  .rq_pages = rdata->pages,
1715                                  .rq_npages = rdata->nr_pages,
1716                                  .rq_pagesz = rdata->pagesz,
1717                                  .rq_tailsz = rdata->tailsz };
1718
1719         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1720                  __func__, mid->mid, mid->mid_state, rdata->result,
1721                  rdata->bytes);
1722
1723         switch (mid->mid_state) {
1724         case MID_RESPONSE_RECEIVED:
1725                 credits_received = le16_to_cpu(buf->CreditRequest);
1726                 /* result already set, check signature */
1727                 if (server->sign) {
1728                         int rc;
1729
1730                         rc = smb2_verify_signature(&rqst, server);
1731                         if (rc)
1732                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1733                                          rc);
1734                 }
1735                 /* FIXME: should this be counted toward the initiating task? */
1736                 task_io_account_read(rdata->bytes);
1737                 cifs_stats_bytes_read(tcon, rdata->bytes);
1738                 break;
1739         case MID_REQUEST_SUBMITTED:
1740         case MID_RETRY_NEEDED:
1741                 rdata->result = -EAGAIN;
1742                 break;
1743         default:
1744                 if (rdata->result != -ENODATA)
1745                         rdata->result = -EIO;
1746         }
1747
1748         if (rdata->result)
1749                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1750
1751         queue_work(cifsiod_wq, &rdata->work);
1752         DeleteMidQEntry(mid);
1753         add_credits(server, credits_received, 0);
1754 }
1755
1756 /* smb2_async_readv - send an async write, and set up mid to handle result */
1757 int
1758 smb2_async_readv(struct cifs_readdata *rdata)
1759 {
1760         int rc;
1761         struct smb2_hdr *buf;
1762         struct cifs_io_parms io_parms;
1763         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1764                                  .rq_nvec = 1 };
1765
1766         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1767                  __func__, rdata->offset, rdata->bytes);
1768
1769         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1770         io_parms.offset = rdata->offset;
1771         io_parms.length = rdata->bytes;
1772         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1773         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1774         io_parms.pid = rdata->pid;
1775         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1776         if (rc)
1777                 return rc;
1778
1779         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1780         /* 4 for rfc1002 length field */
1781         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1782
1783         kref_get(&rdata->refcount);
1784         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1785                              cifs_readv_receive, smb2_readv_callback,
1786                              rdata, 0);
1787         if (rc) {
1788                 kref_put(&rdata->refcount, cifs_readdata_release);
1789                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1790         }
1791
1792         cifs_small_buf_release(buf);
1793         return rc;
1794 }
1795
1796 int
1797 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1798           unsigned int *nbytes, char **buf, int *buf_type)
1799 {
1800         int resp_buftype, rc = -EACCES;
1801         struct smb2_read_rsp *rsp = NULL;
1802         struct kvec iov[1];
1803
1804         *nbytes = 0;
1805         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1806         if (rc)
1807                 return rc;
1808
1809         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1810                           &resp_buftype, CIFS_LOG_ERROR);
1811
1812         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1813
1814         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1815                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1816                 return 0;
1817         }
1818
1819         if (rc) {
1820                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1821                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1822         } else {
1823                 *nbytes = le32_to_cpu(rsp->DataLength);
1824                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1825                     (*nbytes > io_parms->length)) {
1826                         cifs_dbg(FYI, "bad length %d for count %d\n",
1827                                  *nbytes, io_parms->length);
1828                         rc = -EIO;
1829                         *nbytes = 0;
1830                 }
1831         }
1832
1833         if (*buf) {
1834                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1835                        *nbytes);
1836                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1837         } else if (resp_buftype != CIFS_NO_BUFFER) {
1838                 *buf = iov[0].iov_base;
1839                 if (resp_buftype == CIFS_SMALL_BUFFER)
1840                         *buf_type = CIFS_SMALL_BUFFER;
1841                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1842                         *buf_type = CIFS_LARGE_BUFFER;
1843         }
1844         return rc;
1845 }
1846
1847 /*
1848  * Check the mid_state and signature on received buffer (if any), and queue the
1849  * workqueue completion task.
1850  */
1851 static void
1852 smb2_writev_callback(struct mid_q_entry *mid)
1853 {
1854         struct cifs_writedata *wdata = mid->callback_data;
1855         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1856         unsigned int written;
1857         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1858         unsigned int credits_received = 1;
1859
1860         switch (mid->mid_state) {
1861         case MID_RESPONSE_RECEIVED:
1862                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1863                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1864                 if (wdata->result != 0)
1865                         break;
1866
1867                 written = le32_to_cpu(rsp->DataLength);
1868                 /*
1869                  * Mask off high 16 bits when bytes written as returned
1870                  * by the server is greater than bytes requested by the
1871                  * client. OS/2 servers are known to set incorrect
1872                  * CountHigh values.
1873                  */
1874                 if (written > wdata->bytes)
1875                         written &= 0xFFFF;
1876
1877                 if (written < wdata->bytes)
1878                         wdata->result = -ENOSPC;
1879                 else
1880                         wdata->bytes = written;
1881                 break;
1882         case MID_REQUEST_SUBMITTED:
1883         case MID_RETRY_NEEDED:
1884                 wdata->result = -EAGAIN;
1885                 break;
1886         default:
1887                 wdata->result = -EIO;
1888                 break;
1889         }
1890
1891         if (wdata->result)
1892                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1893
1894         queue_work(cifsiod_wq, &wdata->work);
1895         DeleteMidQEntry(mid);
1896         add_credits(tcon->ses->server, credits_received, 0);
1897 }
1898
1899 /* smb2_async_writev - send an async write, and set up mid to handle result */
1900 int
1901 smb2_async_writev(struct cifs_writedata *wdata,
1902                   void (*release)(struct kref *kref))
1903 {
1904         int rc = -EACCES;
1905         struct smb2_write_req *req = NULL;
1906         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1907         struct kvec iov;
1908         struct smb_rqst rqst;
1909
1910         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1911         if (rc)
1912                 goto async_writev_out;
1913
1914         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1915
1916         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1917         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1918         req->WriteChannelInfoOffset = 0;
1919         req->WriteChannelInfoLength = 0;
1920         req->Channel = 0;
1921         req->Offset = cpu_to_le64(wdata->offset);
1922         /* 4 for rfc1002 length field */
1923         req->DataOffset = cpu_to_le16(
1924                                 offsetof(struct smb2_write_req, Buffer) - 4);
1925         req->RemainingBytes = 0;
1926
1927         /* 4 for rfc1002 length field and 1 for Buffer */
1928         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1929         iov.iov_base = req;
1930
1931         rqst.rq_iov = &iov;
1932         rqst.rq_nvec = 1;
1933         rqst.rq_pages = wdata->pages;
1934         rqst.rq_npages = wdata->nr_pages;
1935         rqst.rq_pagesz = wdata->pagesz;
1936         rqst.rq_tailsz = wdata->tailsz;
1937
1938         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1939                  wdata->offset, wdata->bytes);
1940
1941         req->Length = cpu_to_le32(wdata->bytes);
1942
1943         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1944
1945         kref_get(&wdata->refcount);
1946         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1947                                 smb2_writev_callback, wdata, 0);
1948
1949         if (rc) {
1950                 kref_put(&wdata->refcount, release);
1951                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1952         }
1953
1954 async_writev_out:
1955         cifs_small_buf_release(req);
1956         return rc;
1957 }
1958
1959 /*
1960  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1961  * The length field from io_parms must be at least 1 and indicates a number of
1962  * elements with data to write that begins with position 1 in iov array. All
1963  * data length is specified by count.
1964  */
1965 int
1966 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1967            unsigned int *nbytes, struct kvec *iov, int n_vec)
1968 {
1969         int rc = 0;
1970         struct smb2_write_req *req = NULL;
1971         struct smb2_write_rsp *rsp = NULL;
1972         int resp_buftype;
1973         *nbytes = 0;
1974
1975         if (n_vec < 1)
1976                 return rc;
1977
1978         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1979         if (rc)
1980                 return rc;
1981
1982         if (io_parms->tcon->ses->server == NULL)
1983                 return -ECONNABORTED;
1984
1985         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1986
1987         req->PersistentFileId = io_parms->persistent_fid;
1988         req->VolatileFileId = io_parms->volatile_fid;
1989         req->WriteChannelInfoOffset = 0;
1990         req->WriteChannelInfoLength = 0;
1991         req->Channel = 0;
1992         req->Length = cpu_to_le32(io_parms->length);
1993         req->Offset = cpu_to_le64(io_parms->offset);
1994         /* 4 for rfc1002 length field */
1995         req->DataOffset = cpu_to_le16(
1996                                 offsetof(struct smb2_write_req, Buffer) - 4);
1997         req->RemainingBytes = 0;
1998
1999         iov[0].iov_base = (char *)req;
2000         /* 4 for rfc1002 length field and 1 for Buffer */
2001         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2002
2003         /* length of entire message including data to be written */
2004         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2005
2006         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2007                           &resp_buftype, 0);
2008         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2009
2010         if (rc) {
2011                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2012                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2013         } else
2014                 *nbytes = le32_to_cpu(rsp->DataLength);
2015
2016         free_rsp_buf(resp_buftype, rsp);
2017         return rc;
2018 }
2019
2020 static unsigned int
2021 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2022 {
2023         int len;
2024         unsigned int entrycount = 0;
2025         unsigned int next_offset = 0;
2026         FILE_DIRECTORY_INFO *entryptr;
2027
2028         if (bufstart == NULL)
2029                 return 0;
2030
2031         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2032
2033         while (1) {
2034                 entryptr = (FILE_DIRECTORY_INFO *)
2035                                         ((char *)entryptr + next_offset);
2036
2037                 if ((char *)entryptr + size > end_of_buf) {
2038                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2039                         break;
2040                 }
2041
2042                 len = le32_to_cpu(entryptr->FileNameLength);
2043                 if ((char *)entryptr + len + size > end_of_buf) {
2044                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2045                                  end_of_buf);
2046                         break;
2047                 }
2048
2049                 *lastentry = (char *)entryptr;
2050                 entrycount++;
2051
2052                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2053                 if (!next_offset)
2054                         break;
2055         }
2056
2057         return entrycount;
2058 }
2059
2060 /*
2061  * Readdir/FindFirst
2062  */
2063 int
2064 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2065                      u64 persistent_fid, u64 volatile_fid, int index,
2066                      struct cifs_search_info *srch_inf)
2067 {
2068         struct smb2_query_directory_req *req;
2069         struct smb2_query_directory_rsp *rsp = NULL;
2070         struct kvec iov[2];
2071         int rc = 0;
2072         int len;
2073         int resp_buftype;
2074         unsigned char *bufptr;
2075         struct TCP_Server_Info *server;
2076         struct cifs_ses *ses = tcon->ses;
2077         __le16 asteriks = cpu_to_le16('*');
2078         char *end_of_smb;
2079         unsigned int output_size = CIFSMaxBufSize;
2080         size_t info_buf_size;
2081
2082         if (ses && (ses->server))
2083                 server = ses->server;
2084         else
2085                 return -EIO;
2086
2087         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2088         if (rc)
2089                 return rc;
2090
2091         switch (srch_inf->info_level) {
2092         case SMB_FIND_FILE_DIRECTORY_INFO:
2093                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2094                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2095                 break;
2096         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2097                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2098                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2099                 break;
2100         default:
2101                 cifs_dbg(VFS, "info level %u isn't supported\n",
2102                          srch_inf->info_level);
2103                 rc = -EINVAL;
2104                 goto qdir_exit;
2105         }
2106
2107         req->FileIndex = cpu_to_le32(index);
2108         req->PersistentFileId = persistent_fid;
2109         req->VolatileFileId = volatile_fid;
2110
2111         len = 0x2;
2112         bufptr = req->Buffer;
2113         memcpy(bufptr, &asteriks, len);
2114
2115         req->FileNameOffset =
2116                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2117         req->FileNameLength = cpu_to_le16(len);
2118         /*
2119          * BB could be 30 bytes or so longer if we used SMB2 specific
2120          * buffer lengths, but this is safe and close enough.
2121          */
2122         output_size = min_t(unsigned int, output_size, server->maxBuf);
2123         output_size = min_t(unsigned int, output_size, 2 << 15);
2124         req->OutputBufferLength = cpu_to_le32(output_size);
2125
2126         iov[0].iov_base = (char *)req;
2127         /* 4 for RFC1001 length and 1 for Buffer */
2128         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2129
2130         iov[1].iov_base = (char *)(req->Buffer);
2131         iov[1].iov_len = len;
2132
2133         inc_rfc1001_len(req, len - 1 /* Buffer */);
2134
2135         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2136         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2137
2138         if (rc) {
2139                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2140                         srch_inf->endOfSearch = true;
2141                         rc = 0;
2142                 }
2143                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2144                 goto qdir_exit;
2145         }
2146
2147         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2148                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2149                           info_buf_size);
2150         if (rc)
2151                 goto qdir_exit;
2152
2153         srch_inf->unicode = true;
2154
2155         if (srch_inf->ntwrk_buf_start) {
2156                 if (srch_inf->smallBuf)
2157                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2158                 else
2159                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2160         }
2161         srch_inf->ntwrk_buf_start = (char *)rsp;
2162         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2163                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2164         /* 4 for rfc1002 length field */
2165         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2166         srch_inf->entries_in_buffer =
2167                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2168                                     &srch_inf->last_entry, info_buf_size);
2169         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2170         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2171                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2172                  srch_inf->srch_entries_start, srch_inf->last_entry);
2173         if (resp_buftype == CIFS_LARGE_BUFFER)
2174                 srch_inf->smallBuf = false;
2175         else if (resp_buftype == CIFS_SMALL_BUFFER)
2176                 srch_inf->smallBuf = true;
2177         else
2178                 cifs_dbg(VFS, "illegal search buffer type\n");
2179
2180         return rc;
2181
2182 qdir_exit:
2183         free_rsp_buf(resp_buftype, rsp);
2184         return rc;
2185 }
2186
2187 static int
2188 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2189                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2190                unsigned int num, void **data, unsigned int *size)
2191 {
2192         struct smb2_set_info_req *req;
2193         struct smb2_set_info_rsp *rsp = NULL;
2194         struct kvec *iov;
2195         int rc = 0;
2196         int resp_buftype;
2197         unsigned int i;
2198         struct TCP_Server_Info *server;
2199         struct cifs_ses *ses = tcon->ses;
2200
2201         if (ses && (ses->server))
2202                 server = ses->server;
2203         else
2204                 return -EIO;
2205
2206         if (!num)
2207                 return -EINVAL;
2208
2209         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2210         if (!iov)
2211                 return -ENOMEM;
2212
2213         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2214         if (rc) {
2215                 kfree(iov);
2216                 return rc;
2217         }
2218
2219         req->hdr.ProcessId = cpu_to_le32(pid);
2220
2221         req->InfoType = SMB2_O_INFO_FILE;
2222         req->FileInfoClass = info_class;
2223         req->PersistentFileId = persistent_fid;
2224         req->VolatileFileId = volatile_fid;
2225
2226         /* 4 for RFC1001 length and 1 for Buffer */
2227         req->BufferOffset =
2228                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2229         req->BufferLength = cpu_to_le32(*size);
2230
2231         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2232
2233         memcpy(req->Buffer, *data, *size);
2234
2235         iov[0].iov_base = (char *)req;
2236         /* 4 for RFC1001 length */
2237         iov[0].iov_len = get_rfc1002_length(req) + 4;
2238
2239         for (i = 1; i < num; i++) {
2240                 inc_rfc1001_len(req, size[i]);
2241                 le32_add_cpu(&req->BufferLength, size[i]);
2242                 iov[i].iov_base = (char *)data[i];
2243                 iov[i].iov_len = size[i];
2244         }
2245
2246         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2247         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2248
2249         if (rc != 0)
2250                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2251
2252         free_rsp_buf(resp_buftype, rsp);
2253         kfree(iov);
2254         return rc;
2255 }
2256
2257 int
2258 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2259             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2260 {
2261         struct smb2_file_rename_info info;
2262         void **data;
2263         unsigned int size[2];
2264         int rc;
2265         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2266
2267         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2268         if (!data)
2269                 return -ENOMEM;
2270
2271         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2272                               /* 0 = fail if target already exists */
2273         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2274         info.FileNameLength = cpu_to_le32(len);
2275
2276         data[0] = &info;
2277         size[0] = sizeof(struct smb2_file_rename_info);
2278
2279         data[1] = target_file;
2280         size[1] = len + 2 /* null */;
2281
2282         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2283                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2284                            size);
2285         kfree(data);
2286         return rc;
2287 }
2288
2289 int
2290 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2291                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2292 {
2293         struct smb2_file_link_info info;
2294         void **data;
2295         unsigned int size[2];
2296         int rc;
2297         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2298
2299         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2300         if (!data)
2301                 return -ENOMEM;
2302
2303         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2304                               /* 0 = fail if link already exists */
2305         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2306         info.FileNameLength = cpu_to_le32(len);
2307
2308         data[0] = &info;
2309         size[0] = sizeof(struct smb2_file_link_info);
2310
2311         data[1] = target_file;
2312         size[1] = len + 2 /* null */;
2313
2314         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2315                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2316         kfree(data);
2317         return rc;
2318 }
2319
2320 int
2321 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2322              u64 volatile_fid, u32 pid, __le64 *eof)
2323 {
2324         struct smb2_file_eof_info info;
2325         void *data;
2326         unsigned int size;
2327
2328         info.EndOfFile = *eof;
2329
2330         data = &info;
2331         size = sizeof(struct smb2_file_eof_info);
2332
2333         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2334                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2335 }
2336
2337 int
2338 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2339               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2340 {
2341         unsigned int size;
2342         size = sizeof(FILE_BASIC_INFO);
2343         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2344                              current->tgid, FILE_BASIC_INFORMATION, 1,
2345                              (void **)&buf, &size);
2346 }
2347
2348 int
2349 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2350                   const u64 persistent_fid, const u64 volatile_fid,
2351                   __u8 oplock_level)
2352 {
2353         int rc;
2354         struct smb2_oplock_break *req = NULL;
2355
2356         cifs_dbg(FYI, "SMB2_oplock_break\n");
2357         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2358
2359         if (rc)
2360                 return rc;
2361
2362         req->VolatileFid = volatile_fid;
2363         req->PersistentFid = persistent_fid;
2364         req->OplockLevel = oplock_level;
2365         req->hdr.CreditRequest = cpu_to_le16(1);
2366
2367         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2368         /* SMB2 buffer freed by function above */
2369
2370         if (rc) {
2371                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2372                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2373         }
2374
2375         return rc;
2376 }
2377
2378 static void
2379 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2380                         struct kstatfs *kst)
2381 {
2382         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2383                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2384         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2385         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2386         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2387         return;
2388 }
2389
2390 static int
2391 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2392                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2393 {
2394         int rc;
2395         struct smb2_query_info_req *req;
2396
2397         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2398
2399         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2400                 return -EIO;
2401
2402         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2403         if (rc)
2404                 return rc;
2405
2406         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2407         req->FileInfoClass = level;
2408         req->PersistentFileId = persistent_fid;
2409         req->VolatileFileId = volatile_fid;
2410         /* 4 for rfc1002 length field and 1 for pad */
2411         req->InputBufferOffset =
2412                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2413         req->OutputBufferLength = cpu_to_le32(
2414                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2415
2416         iov->iov_base = (char *)req;
2417         /* 4 for rfc1002 length field */
2418         iov->iov_len = get_rfc1002_length(req) + 4;
2419         return 0;
2420 }
2421
2422 int
2423 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2424               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2425 {
2426         struct smb2_query_info_rsp *rsp = NULL;
2427         struct kvec iov;
2428         int rc = 0;
2429         int resp_buftype;
2430         struct cifs_ses *ses = tcon->ses;
2431         struct smb2_fs_full_size_info *info = NULL;
2432
2433         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2434                                 sizeof(struct smb2_fs_full_size_info),
2435                                 persistent_fid, volatile_fid);
2436         if (rc)
2437                 return rc;
2438
2439         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2440         if (rc) {
2441                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2442                 goto qfsinf_exit;
2443         }
2444         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2445
2446         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2447                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2448         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2449                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2450                           sizeof(struct smb2_fs_full_size_info));
2451         if (!rc)
2452                 copy_fs_info_to_kstatfs(info, fsdata);
2453
2454 qfsinf_exit:
2455         free_rsp_buf(resp_buftype, iov.iov_base);
2456         return rc;
2457 }
2458
2459 int
2460 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2461               u64 persistent_fid, u64 volatile_fid, int level)
2462 {
2463         struct smb2_query_info_rsp *rsp = NULL;
2464         struct kvec iov;
2465         int rc = 0;
2466         int resp_buftype, max_len, min_len;
2467         struct cifs_ses *ses = tcon->ses;
2468         unsigned int rsp_len, offset;
2469
2470         if (level == FS_DEVICE_INFORMATION) {
2471                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2472                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2473         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2474                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2475                 min_len = MIN_FS_ATTR_INFO_SIZE;
2476         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2477                 max_len = sizeof(struct smb3_fs_ss_info);
2478                 min_len = sizeof(struct smb3_fs_ss_info);
2479         } else {
2480                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2481                 return -EINVAL;
2482         }
2483
2484         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2485                                 persistent_fid, volatile_fid);
2486         if (rc)
2487                 return rc;
2488
2489         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2490         if (rc) {
2491                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2492                 goto qfsattr_exit;
2493         }
2494         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2495
2496         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2497         offset = le16_to_cpu(rsp->OutputBufferOffset);
2498         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2499         if (rc)
2500                 goto qfsattr_exit;
2501
2502         if (level == FS_ATTRIBUTE_INFORMATION)
2503                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2504                         + (char *)&rsp->hdr, min_t(unsigned int,
2505                         rsp_len, max_len));
2506         else if (level == FS_DEVICE_INFORMATION)
2507                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2508                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2509         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2510                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2511                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2512                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2513                 tcon->perf_sector_size =
2514                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2515         }
2516
2517 qfsattr_exit:
2518         free_rsp_buf(resp_buftype, iov.iov_base);
2519         return rc;
2520 }
2521
2522 int
2523 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2524            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2525            const __u32 num_lock, struct smb2_lock_element *buf)
2526 {
2527         int rc = 0;
2528         struct smb2_lock_req *req = NULL;
2529         struct kvec iov[2];
2530         int resp_buf_type;
2531         unsigned int count;
2532
2533         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2534
2535         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2536         if (rc)
2537                 return rc;
2538
2539         req->hdr.ProcessId = cpu_to_le32(pid);
2540         req->LockCount = cpu_to_le16(num_lock);
2541
2542         req->PersistentFileId = persist_fid;
2543         req->VolatileFileId = volatile_fid;
2544
2545         count = num_lock * sizeof(struct smb2_lock_element);
2546         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2547
2548         iov[0].iov_base = (char *)req;
2549         /* 4 for rfc1002 length field and count for all locks */
2550         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2551         iov[1].iov_base = (char *)buf;
2552         iov[1].iov_len = count;
2553
2554         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2555         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2556         if (rc) {
2557                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2558                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2559         }
2560
2561         return rc;
2562 }
2563
2564 int
2565 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2566           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2567           const __u64 length, const __u64 offset, const __u32 lock_flags,
2568           const bool wait)
2569 {
2570         struct smb2_lock_element lock;
2571
2572         lock.Offset = cpu_to_le64(offset);
2573         lock.Length = cpu_to_le64(length);
2574         lock.Flags = cpu_to_le32(lock_flags);
2575         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2576                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2577
2578         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2579 }
2580
2581 int
2582 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2583                  __u8 *lease_key, const __le32 lease_state)
2584 {
2585         int rc;
2586         struct smb2_lease_ack *req = NULL;
2587
2588         cifs_dbg(FYI, "SMB2_lease_break\n");
2589         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2590
2591         if (rc)
2592                 return rc;
2593
2594         req->hdr.CreditRequest = cpu_to_le16(1);
2595         req->StructureSize = cpu_to_le16(36);
2596         inc_rfc1001_len(req, 12);
2597
2598         memcpy(req->LeaseKey, lease_key, 16);
2599         req->LeaseState = lease_state;
2600
2601         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2602         /* SMB2 buffer freed by function above */
2603
2604         if (rc) {
2605                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2606                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2607         }
2608
2609         return rc;
2610 }