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