fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         /* set it to the maximum buffer size value we can send with 1 credit */
 417         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 418                                SMB2_MAX_BUFFER_SIZE);
 419         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 420         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 421         /* BB Do we need to validate the SecurityMode? */
 422         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 423         server->capabilities = le32_to_cpu(rsp->Capabilities);
 424         /* Internal types */
 425         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 426
 427         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 428                                                &rsp->hdr);
 429         /*
 430          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 431          * for us will be
 432          *      ses->sectype = RawNTLMSSP;
 433          * but for time being this is our only auth choice so doesn't matter.
 434          * We just found a server which sets blob length to zero expecting raw.
 435          */
 436         if (blob_length == 0)
 437                 cifs_dbg(FYI, "missing security blob on negprot\n");
 438
 439         rc = cifs_enable_signing(server, ses->sign);
 440 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 441         if (rc)
 442                 goto neg_exit;
 443         if (blob_length)
 444                 rc = decode_neg_token_init(security_blob, blob_length,
 445                                    &server->sec_type);
 446         if (rc == 1)
 447                 rc = 0;
 448         else if (rc == 0) {
 449                 rc = -EIO;
 450                 goto neg_exit;
 451         }
 452 #endif
 453
 454 neg_exit:
 455         free_rsp_buf(resp_buftype, rsp);
 456         return rc;
 457 }
 458
 459 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 460 {
 461         int rc = 0;
 462         struct validate_negotiate_info_req vneg_inbuf;
 463         struct validate_negotiate_info_rsp *pneg_rsp;
 464         u32 rsplen;
 465
 466         cifs_dbg(FYI, "validate negotiate\n");
 467
 468         /*
 469          * validation ioctl must be signed, so no point sending this if we
 470          * can not sign it.  We could eventually change this to selectively
 471          * sign just this, the first and only signed request on a connection.
 472          * This is good enough for now since a user who wants better security
 473          * would also enable signing on the mount. Having validation of
 474          * negotiate info for signed connections helps reduce attack vectors
 475          */
 476         if (tcon->ses->server->sign == false)
 477                 return 0; /* validation requires signing */
 478
 479         vneg_inbuf.Capabilities =
 480                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 481         memcpy(vneg_inbuf.Guid, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 482
 483         if (tcon->ses->sign)
 484                 vneg_inbuf.SecurityMode =
 485                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 486         else if (global_secflags & CIFSSEC_MAY_SIGN)
 487                 vneg_inbuf.SecurityMode =
 488                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 489         else
 490                 vneg_inbuf.SecurityMode = 0;
 491
 492         vneg_inbuf.DialectCount = cpu_to_le16(1);
 493         vneg_inbuf.Dialects[0] =
 494                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 495
 496         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 497                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 498                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 499                 (char **)&pneg_rsp, &rsplen);
 500
 501         if (rc != 0) {
 502                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 503                 return -EIO;
 504         }
 505
 506         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 507                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 508                 return -EIO;
 509         }
 510
 511         /* check validate negotiate info response matches what we got earlier */
 512         if (pneg_rsp->Dialect !=
 513                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 514                 goto vneg_out;
 515
 516         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 517                 goto vneg_out;
 518
 519         /* do not validate server guid because not saved at negprot time yet */
 520
 521         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 522               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 523                 goto vneg_out;
 524
 525         /* validate negotiate successful */
 526         cifs_dbg(FYI, "validate negotiate info successful\n");
 527         return 0;
 528
 529 vneg_out:
 530         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 531         return -EIO;
 532 }
 533
 534 int
 535 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 536                 const struct nls_table *nls_cp)
 537 {
 538         struct smb2_sess_setup_req *req;
 539         struct smb2_sess_setup_rsp *rsp = NULL;
 540         struct kvec iov[2];
 541         int rc = 0;
 542         int resp_buftype;
 543         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 544         struct TCP_Server_Info *server = ses->server;
 545         u16 blob_length = 0;
 546         char *security_blob;
 547         char *ntlmssp_blob = NULL;
 548         bool use_spnego = false; /* else use raw ntlmssp */
 549
 550         cifs_dbg(FYI, "Session Setup\n");
 551
 552         if (!server) {
 553                 WARN(1, "%s: server is NULL!\n", __func__);
 554                 return -EIO;
 555         }
 556
 557         /*
 558          * If we are here due to reconnect, free per-smb session key
 559          * in case signing was required.
 560          */
 561         kfree(ses->auth_key.response);
 562         ses->auth_key.response = NULL;
 563
 564         /*
 565          * If memory allocation is successful, caller of this function
 566          * frees it.
 567          */
 568         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 569         if (!ses->ntlmssp)
 570                 return -ENOMEM;
 571         ses->ntlmssp->sesskey_per_smbsess = true;
 572
 573         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 574         ses->sectype = RawNTLMSSP;
 575
 576 ssetup_ntlmssp_authenticate:
 577         if (phase == NtLmChallenge)
 578                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 579
 580         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 581         if (rc)
 582                 return rc;
 583
 584         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 585         req->VcNumber = 0; /* MBZ */
 586         /* to enable echos and oplocks */
 587         req->hdr.CreditRequest = cpu_to_le16(3);
 588
 589         /* only one of SMB2 signing flags may be set in SMB2 request */
 590         if (server->sign)
 591                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 592         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 593                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 594         else
 595                 req->SecurityMode = 0;
 596
 597         req->Capabilities = 0;
 598         req->Channel = 0; /* MBZ */
 599
 600         iov[0].iov_base = (char *)req;
 601         /* 4 for rfc1002 length field and 1 for pad */
 602         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 603         if (phase == NtLmNegotiate) {
 604                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 605                                        GFP_KERNEL);
 606                 if (ntlmssp_blob == NULL) {
 607                         rc = -ENOMEM;
 608                         goto ssetup_exit;
 609                 }
 610                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 611                 if (use_spnego) {
 612                         /* blob_length = build_spnego_ntlmssp_blob(
 613                                         &security_blob,
 614                                         sizeof(struct _NEGOTIATE_MESSAGE),
 615                                         ntlmssp_blob); */
 616                         /* BB eventually need to add this */
 617                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 618                         rc = -EOPNOTSUPP;
 619                         kfree(ntlmssp_blob);
 620                         goto ssetup_exit;
 621                 } else {
 622                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 623                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 624                         security_blob = ntlmssp_blob;
 625                 }
 626         } else if (phase == NtLmAuthenticate) {
 627                 req->hdr.SessionId = ses->Suid;
 628                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 629                                        GFP_KERNEL);
 630                 if (ntlmssp_blob == NULL) {
 631                         rc = -ENOMEM;
 632                         goto ssetup_exit;
 633                 }
 634                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 635                                              nls_cp);
 636                 if (rc) {
 637                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 638                                  rc);
 639                         goto ssetup_exit; /* BB double check error handling */
 640                 }
 641                 if (use_spnego) {
 642                         /* blob_length = build_spnego_ntlmssp_blob(
 643                                                         &security_blob,
 644                                                         blob_length,
 645                                                         ntlmssp_blob); */
 646                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 647                         rc = -EOPNOTSUPP;
 648                         kfree(ntlmssp_blob);
 649                         goto ssetup_exit;
 650                 } else {
 651                         security_blob = ntlmssp_blob;
 652                 }
 653         } else {
 654                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 655                 rc = -EIO;
 656                 goto ssetup_exit;
 657         }
 658
 659         /* Testing shows that buffer offset must be at location of Buffer[0] */
 660         req->SecurityBufferOffset =
 661                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 662                                             1 /* pad */ - 4 /* rfc1001 len */);
 663         req->SecurityBufferLength = cpu_to_le16(blob_length);
 664         iov[1].iov_base = security_blob;
 665         iov[1].iov_len = blob_length;
 666
 667         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 668
 669         /* BB add code to build os and lm fields */
 670
 671         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 672                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 673
 674         kfree(security_blob);
 675         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 676         if (resp_buftype != CIFS_NO_BUFFER &&
 677             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 678                 if (phase != NtLmNegotiate) {
 679                         cifs_dbg(VFS, "Unexpected more processing error\n");
 680                         goto ssetup_exit;
 681                 }
 682                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 683                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 684                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 685                                  le16_to_cpu(rsp->SecurityBufferOffset));
 686                         rc = -EIO;
 687                         goto ssetup_exit;
 688                 }
 689
 690                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 691                 phase = NtLmChallenge; /* process ntlmssp challenge */
 692                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 693                 ses->Suid = rsp->hdr.SessionId;
 694                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 695                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 696         }
 697
 698         /*
 699          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 700          * but at least the raw NTLMSSP case works.
 701          */
 702         /*
 703          * No tcon so can't do
 704          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 705          */
 706         if (rc != 0)
 707                 goto ssetup_exit;
 708
 709         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 710         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 711                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 712 ssetup_exit:
 713         free_rsp_buf(resp_buftype, rsp);
 714
 715         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 716         if ((phase == NtLmChallenge) && (rc == 0))
 717                 goto ssetup_ntlmssp_authenticate;
 718
 719         if (!rc) {
 720                 mutex_lock(&server->srv_mutex);
 721                 if (server->sign && server->ops->generate_signingkey) {
 722                         rc = server->ops->generate_signingkey(ses);
 723                         kfree(ses->auth_key.response);
 724                         ses->auth_key.response = NULL;
 725                         if (rc) {
 726                                 cifs_dbg(FYI,
 727                                         "SMB3 session key generation failed\n");
 728                                 mutex_unlock(&server->srv_mutex);
 729                                 goto keygen_exit;
 730                         }
 731                 }
 732                 if (!server->session_estab) {
 733                         server->sequence_number = 0x2;
 734                         server->session_estab = true;
 735                 }
 736                 mutex_unlock(&server->srv_mutex);
 737
 738                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 739                 spin_lock(&GlobalMid_Lock);
 740                 ses->status = CifsGood;
 741                 ses->need_reconnect = false;
 742                 spin_unlock(&GlobalMid_Lock);
 743         }
 744
 745 keygen_exit:
 746         if (!server->sign) {
 747                 kfree(ses->auth_key.response);
 748                 ses->auth_key.response = NULL;
 749         }
 750         kfree(ses->ntlmssp);
 751
 752         return rc;
 753 }
 754
 755 int
 756 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 757 {
 758         struct smb2_logoff_req *req; /* response is also trivial struct */
 759         int rc = 0;
 760         struct TCP_Server_Info *server;
 761
 762         cifs_dbg(FYI, "disconnect session %p\n", ses);
 763
 764         if (ses && (ses->server))
 765                 server = ses->server;
 766         else
 767                 return -EIO;
 768
 769         /* no need to send SMB logoff if uid already closed due to reconnect */
 770         if (ses->need_reconnect)
 771                 goto smb2_session_already_dead;
 772
 773         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 774         if (rc)
 775                 return rc;
 776
 777          /* since no tcon, smb2_init can not do this, so do here */
 778         req->hdr.SessionId = ses->Suid;
 779         if (server->sign)
 780                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 781
 782         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 783         /*
 784          * No tcon so can't do
 785          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 786          */
 787
 788 smb2_session_already_dead:
 789         return rc;
 790 }
 791
 792 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 793 {
 794         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 795 }
 796
 797 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 798
 799 /* These are similar values to what Windows uses */
 800 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 801 {
 802         tcon->max_chunks = 256;
 803         tcon->max_bytes_chunk = 1048576;
 804         tcon->max_bytes_copy = 16777216;
 805 }
 806
 807 int
 808 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 809           struct cifs_tcon *tcon, const struct nls_table *cp)
 810 {
 811         struct smb2_tree_connect_req *req;
 812         struct smb2_tree_connect_rsp *rsp = NULL;
 813         struct kvec iov[2];
 814         int rc = 0;
 815         int resp_buftype;
 816         int unc_path_len;
 817         struct TCP_Server_Info *server;
 818         __le16 *unc_path = NULL;
 819
 820         cifs_dbg(FYI, "TCON\n");
 821
 822         if ((ses->server) && tree)
 823                 server = ses->server;
 824         else
 825                 return -EIO;
 826
 827         if (tcon && tcon->bad_network_name)
 828                 return -ENOENT;
 829
 830         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 831         if (unc_path == NULL)
 832                 return -ENOMEM;
 833
 834         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 835         unc_path_len *= 2;
 836         if (unc_path_len < 2) {
 837                 kfree(unc_path);
 838                 return -EINVAL;
 839         }
 840
 841         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 842         if (rc) {
 843                 kfree(unc_path);
 844                 return rc;
 845         }
 846
 847         if (tcon == NULL) {
 848                 /* since no tcon, smb2_init can not do this, so do here */
 849                 req->hdr.SessionId = ses->Suid;
 850                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 851                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 852         }
 853
 854         iov[0].iov_base = (char *)req;
 855         /* 4 for rfc1002 length field and 1 for pad */
 856         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 857
 858         /* Testing shows that buffer offset must be at location of Buffer[0] */
 859         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 860                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 861         req->PathLength = cpu_to_le16(unc_path_len - 2);
 862         iov[1].iov_base = unc_path;
 863         iov[1].iov_len = unc_path_len;
 864
 865         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 866
 867         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 868         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 869
 870         if (rc != 0) {
 871                 if (tcon) {
 872                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 873                         tcon->need_reconnect = true;
 874                 }
 875                 goto tcon_error_exit;
 876         }
 877
 878         if (tcon == NULL) {
 879                 ses->ipc_tid = rsp->hdr.TreeId;
 880                 goto tcon_exit;
 881         }
 882
 883         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 884                 cifs_dbg(FYI, "connection to disk share\n");
 885         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 886                 tcon->ipc = true;
 887                 cifs_dbg(FYI, "connection to pipe share\n");
 888         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 889                 tcon->print = true;
 890                 cifs_dbg(FYI, "connection to printer\n");
 891         } else {
 892                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 893                 rc = -EOPNOTSUPP;
 894                 goto tcon_error_exit;
 895         }
 896
 897         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 898         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 899         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 900         tcon->tidStatus = CifsGood;
 901         tcon->need_reconnect = false;
 902         tcon->tid = rsp->hdr.TreeId;
 903         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 904
 905         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 906             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 907                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 908         init_copy_chunk_defaults(tcon);
 909         if (tcon->ses->server->ops->validate_negotiate)
 910                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 911 tcon_exit:
 912         free_rsp_buf(resp_buftype, rsp);
 913         kfree(unc_path);
 914         return rc;
 915
 916 tcon_error_exit:
 917         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 918                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 919                 tcon->bad_network_name = true;
 920         }
 921         goto tcon_exit;
 922 }
 923
 924 int
 925 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 926 {
 927         struct smb2_tree_disconnect_req *req; /* response is trivial */
 928         int rc = 0;
 929         struct TCP_Server_Info *server;
 930         struct cifs_ses *ses = tcon->ses;
 931
 932         cifs_dbg(FYI, "Tree Disconnect\n");
 933
 934         if (ses && (ses->server))
 935                 server = ses->server;
 936         else
 937                 return -EIO;
 938
 939         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 940                 return 0;
 941
 942         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 943         if (rc)
 944                 return rc;
 945
 946         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 947         if (rc)
 948                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 949
 950         return rc;
 951 }
 952
 953
 954 static struct create_durable *
 955 create_durable_buf(void)
 956 {
 957         struct create_durable *buf;
 958
 959         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 960         if (!buf)
 961                 return NULL;
 962
 963         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 964                                         (struct create_durable, Data));
 965         buf->ccontext.DataLength = cpu_to_le32(16);
 966         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 967                                 (struct create_durable, Name));
 968         buf->ccontext.NameLength = cpu_to_le16(4);
 969         buf->Name[0] = 'D';
 970         buf->Name[1] = 'H';
 971         buf->Name[2] = 'n';
 972         buf->Name[3] = 'Q';
 973         return buf;
 974 }
 975
 976 static struct create_durable *
 977 create_reconnect_durable_buf(struct cifs_fid *fid)
 978 {
 979         struct create_durable *buf;
 980
 981         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 982         if (!buf)
 983                 return NULL;
 984
 985         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 986                                         (struct create_durable, Data));
 987         buf->ccontext.DataLength = cpu_to_le32(16);
 988         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 989                                 (struct create_durable, Name));
 990         buf->ccontext.NameLength = cpu_to_le16(4);
 991         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 992         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
 993         buf->Name[0] = 'D';
 994         buf->Name[1] = 'H';
 995         buf->Name[2] = 'n';
 996         buf->Name[3] = 'C';
 997         return buf;
 998 }
 999
1000 static __u8
1001 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1002                   unsigned int *epoch)
1003 {
1004         char *data_offset;
1005         struct create_context *cc;
1006         unsigned int next = 0;
1007         char *name;
1008
1009         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1010         cc = (struct create_context *)data_offset;
1011         do {
1012                 cc = (struct create_context *)((char *)cc + next);
1013                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1014                 if (le16_to_cpu(cc->NameLength) != 4 ||
1015                     strncmp(name, "RqLs", 4)) {
1016                         next = le32_to_cpu(cc->Next);
1017                         continue;
1018                 }
1019                 return server->ops->parse_lease_buf(cc, epoch);
1020         } while (next != 0);
1021
1022         return 0;
1023 }
1024
1025 static int
1026 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1027                   unsigned int *num_iovec, __u8 *oplock)
1028 {
1029         struct smb2_create_req *req = iov[0].iov_base;
1030         unsigned int num = *num_iovec;
1031
1032         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1033         if (iov[num].iov_base == NULL)
1034                 return -ENOMEM;
1035         iov[num].iov_len = server->vals->create_lease_size;
1036         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1037         if (!req->CreateContextsOffset)
1038                 req->CreateContextsOffset = cpu_to_le32(
1039                                 sizeof(struct smb2_create_req) - 4 +
1040                                 iov[num - 1].iov_len);
1041         le32_add_cpu(&req->CreateContextsLength,
1042                      server->vals->create_lease_size);
1043         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1044         *num_iovec = num + 1;
1045         return 0;
1046 }
1047
1048 static int
1049 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1050                     struct cifs_open_parms *oparms)
1051 {
1052         struct smb2_create_req *req = iov[0].iov_base;
1053         unsigned int num = *num_iovec;
1054
1055         if (oparms->reconnect) {
1056                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1057                 /* indicate that we don't need to relock the file */
1058                 oparms->reconnect = false;
1059         } else
1060                 iov[num].iov_base = create_durable_buf();
1061         if (iov[num].iov_base == NULL)
1062                 return -ENOMEM;
1063         iov[num].iov_len = sizeof(struct create_durable);
1064         if (!req->CreateContextsOffset)
1065                 req->CreateContextsOffset =
1066                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1067                                                                 iov[1].iov_len);
1068         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1069         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1070         *num_iovec = num + 1;
1071         return 0;
1072 }
1073
1074 int
1075 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1076           __u8 *oplock, struct smb2_file_all_info *buf,
1077           struct smb2_err_rsp **err_buf)
1078 {
1079         struct smb2_create_req *req;
1080         struct smb2_create_rsp *rsp;
1081         struct TCP_Server_Info *server;
1082         struct cifs_tcon *tcon = oparms->tcon;
1083         struct cifs_ses *ses = tcon->ses;
1084         struct kvec iov[4];
1085         int resp_buftype;
1086         int uni_path_len;
1087         __le16 *copy_path = NULL;
1088         int copy_size;
1089         int rc = 0;
1090         unsigned int num_iovecs = 2;
1091         __u32 file_attributes = 0;
1092
1093         cifs_dbg(FYI, "create/open\n");
1094
1095         if (ses && (ses->server))
1096                 server = ses->server;
1097         else
1098                 return -EIO;
1099
1100         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1101         if (rc)
1102                 return rc;
1103
1104         if (oparms->create_options & CREATE_OPTION_READONLY)
1105                 file_attributes |= ATTR_READONLY;
1106
1107         req->ImpersonationLevel = IL_IMPERSONATION;
1108         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1109         /* File attributes ignored on open (used in create though) */
1110         req->FileAttributes = cpu_to_le32(file_attributes);
1111         req->ShareAccess = FILE_SHARE_ALL_LE;
1112         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1113         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1114         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1115         /* do not count rfc1001 len field */
1116         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1117
1118         iov[0].iov_base = (char *)req;
1119         /* 4 for rfc1002 length field */
1120         iov[0].iov_len = get_rfc1002_length(req) + 4;
1121
1122         /* MUST set path len (NameLength) to 0 opening root of share */
1123         req->NameLength = cpu_to_le16(uni_path_len - 2);
1124         /* -1 since last byte is buf[0] which is sent below (path) */
1125         iov[0].iov_len--;
1126         if (uni_path_len % 8 != 0) {
1127                 copy_size = uni_path_len / 8 * 8;
1128                 if (copy_size < uni_path_len)
1129                         copy_size += 8;
1130
1131                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1132                 if (!copy_path)
1133                         return -ENOMEM;
1134                 memcpy((char *)copy_path, (const char *)path,
1135                         uni_path_len);
1136                 uni_path_len = copy_size;
1137                 path = copy_path;
1138         }
1139
1140         iov[1].iov_len = uni_path_len;
1141         iov[1].iov_base = path;
1142         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1143         inc_rfc1001_len(req, uni_path_len - 1);
1144
1145         if (!server->oplocks)
1146                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1147
1148         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1149             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1150                 req->RequestedOplockLevel = *oplock;
1151         else {
1152                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1153                 if (rc) {
1154                         cifs_small_buf_release(req);
1155                         kfree(copy_path);
1156                         return rc;
1157                 }
1158         }
1159
1160         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1161                 /* need to set Next field of lease context if we request it */
1162                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1163                         struct create_context *ccontext =
1164                             (struct create_context *)iov[num_iovecs-1].iov_base;
1165                         ccontext->Next =
1166                                 cpu_to_le32(server->vals->create_lease_size);
1167                 }
1168                 rc = add_durable_context(iov, &num_iovecs, oparms);
1169                 if (rc) {
1170                         cifs_small_buf_release(req);
1171                         kfree(copy_path);
1172                         kfree(iov[num_iovecs-1].iov_base);
1173                         return rc;
1174                 }
1175         }
1176
1177         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1178         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1179
1180         if (rc != 0) {
1181                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1182                 if (err_buf)
1183                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1184                                            GFP_KERNEL);
1185                 goto creat_exit;
1186         }
1187
1188         oparms->fid->persistent_fid = rsp->PersistentFileId;
1189         oparms->fid->volatile_fid = rsp->VolatileFileId;
1190
1191         if (buf) {
1192                 memcpy(buf, &rsp->CreationTime, 32);
1193                 buf->AllocationSize = rsp->AllocationSize;
1194                 buf->EndOfFile = rsp->EndofFile;
1195                 buf->Attributes = rsp->FileAttributes;
1196                 buf->NumberOfLinks = cpu_to_le32(1);
1197                 buf->DeletePending = 0;
1198         }
1199
1200         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1201                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1202         else
1203                 *oplock = rsp->OplockLevel;
1204 creat_exit:
1205         kfree(copy_path);
1206         free_rsp_buf(resp_buftype, rsp);
1207         return rc;
1208 }
1209
1210 /*
1211  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1212  */
1213 int
1214 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1215            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1216            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1217 {
1218         struct smb2_ioctl_req *req;
1219         struct smb2_ioctl_rsp *rsp;
1220         struct TCP_Server_Info *server;
1221         struct cifs_ses *ses = tcon->ses;
1222         struct kvec iov[2];
1223         int resp_buftype;
1224         int num_iovecs;
1225         int rc = 0;
1226
1227         cifs_dbg(FYI, "SMB2 IOCTL\n");
1228
1229         *out_data = NULL;
1230         /* zero out returned data len, in case of error */
1231         if (plen)
1232                 *plen = 0;
1233
1234         if (ses && (ses->server))
1235                 server = ses->server;
1236         else
1237                 return -EIO;
1238
1239         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1240         if (rc)
1241                 return rc;
1242
1243         req->CtlCode = cpu_to_le32(opcode);
1244         req->PersistentFileId = persistent_fid;
1245         req->VolatileFileId = volatile_fid;
1246
1247         if (indatalen) {
1248                 req->InputCount = cpu_to_le32(indatalen);
1249                 /* do not set InputOffset if no input data */
1250                 req->InputOffset =
1251                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1252                 iov[1].iov_base = in_data;
1253                 iov[1].iov_len = indatalen;
1254                 num_iovecs = 2;
1255         } else
1256                 num_iovecs = 1;
1257
1258         req->OutputOffset = 0;
1259         req->OutputCount = 0; /* MBZ */
1260
1261         /*
1262          * Could increase MaxOutputResponse, but that would require more
1263          * than one credit. Windows typically sets this smaller, but for some
1264          * ioctls it may be useful to allow server to send more. No point
1265          * limiting what the server can send as long as fits in one credit
1266          */
1267         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1268
1269         if (is_fsctl)
1270                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1271         else
1272                 req->Flags = 0;
1273
1274         iov[0].iov_base = (char *)req;
1275
1276         /*
1277          * If no input data, the size of ioctl struct in
1278          * protocol spec still includes a 1 byte data buffer,
1279          * but if input data passed to ioctl, we do not
1280          * want to double count this, so we do not send
1281          * the dummy one byte of data in iovec[0] if sending
1282          * input data (in iovec[1]). We also must add 4 bytes
1283          * in first iovec to allow for rfc1002 length field.
1284          */
1285
1286         if (indatalen) {
1287                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1288                 inc_rfc1001_len(req, indatalen - 1);
1289         } else
1290                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1291
1292
1293         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1294         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1295
1296         if ((rc != 0) && (rc != -EINVAL)) {
1297                 if (tcon)
1298                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1299                 goto ioctl_exit;
1300         } else if (rc == -EINVAL) {
1301                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1302                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1303                         if (tcon)
1304                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1305                         goto ioctl_exit;
1306                 }
1307         }
1308
1309         /* check if caller wants to look at return data or just return rc */
1310         if ((plen == NULL) || (out_data == NULL))
1311                 goto ioctl_exit;
1312
1313         *plen = le32_to_cpu(rsp->OutputCount);
1314
1315         /* We check for obvious errors in the output buffer length and offset */
1316         if (*plen == 0)
1317                 goto ioctl_exit; /* server returned no data */
1318         else if (*plen > 0xFF00) {
1319                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1320                 *plen = 0;
1321                 rc = -EIO;
1322                 goto ioctl_exit;
1323         }
1324
1325         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1326                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1327                         le32_to_cpu(rsp->OutputOffset));
1328                 *plen = 0;
1329                 rc = -EIO;
1330                 goto ioctl_exit;
1331         }
1332
1333         *out_data = kmalloc(*plen, GFP_KERNEL);
1334         if (*out_data == NULL) {
1335                 rc = -ENOMEM;
1336                 goto ioctl_exit;
1337         }
1338
1339         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1340                *plen);
1341 ioctl_exit:
1342         free_rsp_buf(resp_buftype, rsp);
1343         return rc;
1344 }
1345
1346 /*
1347  *   Individual callers to ioctl worker function follow
1348  */
1349
1350 int
1351 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1352                      u64 persistent_fid, u64 volatile_fid)
1353 {
1354         int rc;
1355         char *res_key = NULL;
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         kfree(res_key);
1369
1370         return rc;
1371 }
1372
1373 int
1374 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1375            u64 persistent_fid, u64 volatile_fid)
1376 {
1377         struct smb2_close_req *req;
1378         struct smb2_close_rsp *rsp;
1379         struct TCP_Server_Info *server;
1380         struct cifs_ses *ses = tcon->ses;
1381         struct kvec iov[1];
1382         int resp_buftype;
1383         int rc = 0;
1384
1385         cifs_dbg(FYI, "Close\n");
1386
1387         if (ses && (ses->server))
1388                 server = ses->server;
1389         else
1390                 return -EIO;
1391
1392         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1393         if (rc)
1394                 return rc;
1395
1396         req->PersistentFileId = persistent_fid;
1397         req->VolatileFileId = volatile_fid;
1398
1399         iov[0].iov_base = (char *)req;
1400         /* 4 for rfc1002 length field */
1401         iov[0].iov_len = get_rfc1002_length(req) + 4;
1402
1403         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1404         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1405
1406         if (rc != 0) {
1407                 if (tcon)
1408                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1409                 goto close_exit;
1410         }
1411
1412         /* BB FIXME - decode close response, update inode for caching */
1413
1414 close_exit:
1415         free_rsp_buf(resp_buftype, rsp);
1416         return rc;
1417 }
1418
1419 static int
1420 validate_buf(unsigned int offset, unsigned int buffer_length,
1421              struct smb2_hdr *hdr, unsigned int min_buf_size)
1422
1423 {
1424         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1425         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1426         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1427         char *end_of_buf = begin_of_buf + buffer_length;
1428
1429
1430         if (buffer_length < min_buf_size) {
1431                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1432                          buffer_length, min_buf_size);
1433                 return -EINVAL;
1434         }
1435
1436         /* check if beyond RFC1001 maximum length */
1437         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1438                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1439                          buffer_length, smb_len);
1440                 return -EINVAL;
1441         }
1442
1443         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1444                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1445                 return -EINVAL;
1446         }
1447
1448         return 0;
1449 }
1450
1451 /*
1452  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1453  * Caller must free buffer.
1454  */
1455 static int
1456 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1457                       struct smb2_hdr *hdr, unsigned int minbufsize,
1458                       char *data)
1459
1460 {
1461         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1462         int rc;
1463
1464         if (!data)
1465                 return -EINVAL;
1466
1467         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1468         if (rc)
1469                 return rc;
1470
1471         memcpy(data, begin_of_buf, buffer_length);
1472
1473         return 0;
1474 }
1475
1476 static int
1477 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1478            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1479            size_t output_len, size_t min_len, void *data)
1480 {
1481         struct smb2_query_info_req *req;
1482         struct smb2_query_info_rsp *rsp = NULL;
1483         struct kvec iov[2];
1484         int rc = 0;
1485         int resp_buftype;
1486         struct TCP_Server_Info *server;
1487         struct cifs_ses *ses = tcon->ses;
1488
1489         cifs_dbg(FYI, "Query Info\n");
1490
1491         if (ses && (ses->server))
1492                 server = ses->server;
1493         else
1494                 return -EIO;
1495
1496         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1497         if (rc)
1498                 return rc;
1499
1500         req->InfoType = SMB2_O_INFO_FILE;
1501         req->FileInfoClass = info_class;
1502         req->PersistentFileId = persistent_fid;
1503         req->VolatileFileId = volatile_fid;
1504         /* 4 for rfc1002 length field and 1 for Buffer */
1505         req->InputBufferOffset =
1506                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1507         req->OutputBufferLength = cpu_to_le32(output_len);
1508
1509         iov[0].iov_base = (char *)req;
1510         /* 4 for rfc1002 length field */
1511         iov[0].iov_len = get_rfc1002_length(req) + 4;
1512
1513         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1514         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1515
1516         if (rc) {
1517                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1518                 goto qinf_exit;
1519         }
1520
1521         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1522                                    le32_to_cpu(rsp->OutputBufferLength),
1523                                    &rsp->hdr, min_len, data);
1524
1525 qinf_exit:
1526         free_rsp_buf(resp_buftype, rsp);
1527         return rc;
1528 }
1529
1530 int
1531 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1532                 u64 persistent_fid, u64 volatile_fid,
1533                 struct smb2_file_all_info *data)
1534 {
1535         return query_info(xid, tcon, persistent_fid, volatile_fid,
1536                           FILE_ALL_INFORMATION,
1537                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1538                           sizeof(struct smb2_file_all_info), data);
1539 }
1540
1541 int
1542 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1543                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1544 {
1545         return query_info(xid, tcon, persistent_fid, volatile_fid,
1546                           FILE_INTERNAL_INFORMATION,
1547                           sizeof(struct smb2_file_internal_info),
1548                           sizeof(struct smb2_file_internal_info), uniqueid);
1549 }
1550
1551 /*
1552  * This is a no-op for now. We're not really interested in the reply, but
1553  * rather in the fact that the server sent one and that server->lstrp
1554  * gets updated.
1555  *
1556  * FIXME: maybe we should consider checking that the reply matches request?
1557  */
1558 static void
1559 smb2_echo_callback(struct mid_q_entry *mid)
1560 {
1561         struct TCP_Server_Info *server = mid->callback_data;
1562         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1563         unsigned int credits_received = 1;
1564
1565         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1566                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1567
1568         DeleteMidQEntry(mid);
1569         add_credits(server, credits_received, CIFS_ECHO_OP);
1570 }
1571
1572 int
1573 SMB2_echo(struct TCP_Server_Info *server)
1574 {
1575         struct smb2_echo_req *req;
1576         int rc = 0;
1577         struct kvec iov;
1578         struct smb_rqst rqst = { .rq_iov = &iov,
1579                                  .rq_nvec = 1 };
1580
1581         cifs_dbg(FYI, "In echo request\n");
1582
1583         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1584         if (rc)
1585                 return rc;
1586
1587         req->hdr.CreditRequest = cpu_to_le16(1);
1588
1589         iov.iov_base = (char *)req;
1590         /* 4 for rfc1002 length field */
1591         iov.iov_len = get_rfc1002_length(req) + 4;
1592
1593         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1594                              CIFS_ECHO_OP);
1595         if (rc)
1596                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1597
1598         cifs_small_buf_release(req);
1599         return rc;
1600 }
1601
1602 int
1603 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1604            u64 volatile_fid)
1605 {
1606         struct smb2_flush_req *req;
1607         struct TCP_Server_Info *server;
1608         struct cifs_ses *ses = tcon->ses;
1609         struct kvec iov[1];
1610         int resp_buftype;
1611         int rc = 0;
1612
1613         cifs_dbg(FYI, "Flush\n");
1614
1615         if (ses && (ses->server))
1616                 server = ses->server;
1617         else
1618                 return -EIO;
1619
1620         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1621         if (rc)
1622                 return rc;
1623
1624         req->PersistentFileId = persistent_fid;
1625         req->VolatileFileId = volatile_fid;
1626
1627         iov[0].iov_base = (char *)req;
1628         /* 4 for rfc1002 length field */
1629         iov[0].iov_len = get_rfc1002_length(req) + 4;
1630
1631         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1632
1633         if ((rc != 0) && tcon)
1634                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1635
1636         free_rsp_buf(resp_buftype, iov[0].iov_base);
1637         return rc;
1638 }
1639
1640 /*
1641  * To form a chain of read requests, any read requests after the first should
1642  * have the end_of_chain boolean set to true.
1643  */
1644 static int
1645 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1646                   unsigned int remaining_bytes, int request_type)
1647 {
1648         int rc = -EACCES;
1649         struct smb2_read_req *req = NULL;
1650
1651         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1652         if (rc)
1653                 return rc;
1654         if (io_parms->tcon->ses->server == NULL)
1655                 return -ECONNABORTED;
1656
1657         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1658
1659         req->PersistentFileId = io_parms->persistent_fid;
1660         req->VolatileFileId = io_parms->volatile_fid;
1661         req->ReadChannelInfoOffset = 0; /* reserved */
1662         req->ReadChannelInfoLength = 0; /* reserved */
1663         req->Channel = 0; /* reserved */
1664         req->MinimumCount = 0;
1665         req->Length = cpu_to_le32(io_parms->length);
1666         req->Offset = cpu_to_le64(io_parms->offset);
1667
1668         if (request_type & CHAINED_REQUEST) {
1669                 if (!(request_type & END_OF_CHAIN)) {
1670                         /* 4 for rfc1002 length field */
1671                         req->hdr.NextCommand =
1672                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1673                 } else /* END_OF_CHAIN */
1674                         req->hdr.NextCommand = 0;
1675                 if (request_type & RELATED_REQUEST) {
1676                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1677                         /*
1678                          * Related requests use info from previous read request
1679                          * in chain.
1680                          */
1681                         req->hdr.SessionId = 0xFFFFFFFF;
1682                         req->hdr.TreeId = 0xFFFFFFFF;
1683                         req->PersistentFileId = 0xFFFFFFFF;
1684                         req->VolatileFileId = 0xFFFFFFFF;
1685                 }
1686         }
1687         if (remaining_bytes > io_parms->length)
1688                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1689         else
1690                 req->RemainingBytes = 0;
1691
1692         iov[0].iov_base = (char *)req;
1693         /* 4 for rfc1002 length field */
1694         iov[0].iov_len = get_rfc1002_length(req) + 4;
1695         return rc;
1696 }
1697
1698 static void
1699 smb2_readv_callback(struct mid_q_entry *mid)
1700 {
1701         struct cifs_readdata *rdata = mid->callback_data;
1702         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1703         struct TCP_Server_Info *server = tcon->ses->server;
1704         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1705         unsigned int credits_received = 1;
1706         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1707                                  .rq_nvec = 1,
1708                                  .rq_pages = rdata->pages,
1709                                  .rq_npages = rdata->nr_pages,
1710                                  .rq_pagesz = rdata->pagesz,
1711                                  .rq_tailsz = rdata->tailsz };
1712
1713         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1714                  __func__, mid->mid, mid->mid_state, rdata->result,
1715                  rdata->bytes);
1716
1717         switch (mid->mid_state) {
1718         case MID_RESPONSE_RECEIVED:
1719                 credits_received = le16_to_cpu(buf->CreditRequest);
1720                 /* result already set, check signature */
1721                 if (server->sign) {
1722                         int rc;
1723
1724                         rc = smb2_verify_signature(&rqst, server);
1725                         if (rc)
1726                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1727                                          rc);
1728                 }
1729                 /* FIXME: should this be counted toward the initiating task? */
1730                 task_io_account_read(rdata->bytes);
1731                 cifs_stats_bytes_read(tcon, rdata->bytes);
1732                 break;
1733         case MID_REQUEST_SUBMITTED:
1734         case MID_RETRY_NEEDED:
1735                 rdata->result = -EAGAIN;
1736                 break;
1737         default:
1738                 if (rdata->result != -ENODATA)
1739                         rdata->result = -EIO;
1740         }
1741
1742         if (rdata->result)
1743                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1744
1745         queue_work(cifsiod_wq, &rdata->work);
1746         DeleteMidQEntry(mid);
1747         add_credits(server, credits_received, 0);
1748 }
1749
1750 /* smb2_async_readv - send an async write, and set up mid to handle result */
1751 int
1752 smb2_async_readv(struct cifs_readdata *rdata)
1753 {
1754         int rc;
1755         struct smb2_hdr *buf;
1756         struct cifs_io_parms io_parms;
1757         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1758                                  .rq_nvec = 1 };
1759
1760         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1761                  __func__, rdata->offset, rdata->bytes);
1762
1763         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1764         io_parms.offset = rdata->offset;
1765         io_parms.length = rdata->bytes;
1766         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1767         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1768         io_parms.pid = rdata->pid;
1769         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1770         if (rc)
1771                 return rc;
1772
1773         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1774         /* 4 for rfc1002 length field */
1775         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1776
1777         kref_get(&rdata->refcount);
1778         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1779                              cifs_readv_receive, smb2_readv_callback,
1780                              rdata, 0);
1781         if (rc) {
1782                 kref_put(&rdata->refcount, cifs_readdata_release);
1783                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1784         }
1785
1786         cifs_small_buf_release(buf);
1787         return rc;
1788 }
1789
1790 int
1791 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1792           unsigned int *nbytes, char **buf, int *buf_type)
1793 {
1794         int resp_buftype, rc = -EACCES;
1795         struct smb2_read_rsp *rsp = NULL;
1796         struct kvec iov[1];
1797
1798         *nbytes = 0;
1799         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1800         if (rc)
1801                 return rc;
1802
1803         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1804                           &resp_buftype, CIFS_LOG_ERROR);
1805
1806         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1807
1808         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1809                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1810                 return 0;
1811         }
1812
1813         if (rc) {
1814                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1815                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1816         } else {
1817                 *nbytes = le32_to_cpu(rsp->DataLength);
1818                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1819                     (*nbytes > io_parms->length)) {
1820                         cifs_dbg(FYI, "bad length %d for count %d\n",
1821                                  *nbytes, io_parms->length);
1822                         rc = -EIO;
1823                         *nbytes = 0;
1824                 }
1825         }
1826
1827         if (*buf) {
1828                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1829                        *nbytes);
1830                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1831         } else if (resp_buftype != CIFS_NO_BUFFER) {
1832                 *buf = iov[0].iov_base;
1833                 if (resp_buftype == CIFS_SMALL_BUFFER)
1834                         *buf_type = CIFS_SMALL_BUFFER;
1835                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1836                         *buf_type = CIFS_LARGE_BUFFER;
1837         }
1838         return rc;
1839 }
1840
1841 /*
1842  * Check the mid_state and signature on received buffer (if any), and queue the
1843  * workqueue completion task.
1844  */
1845 static void
1846 smb2_writev_callback(struct mid_q_entry *mid)
1847 {
1848         struct cifs_writedata *wdata = mid->callback_data;
1849         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1850         unsigned int written;
1851         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1852         unsigned int credits_received = 1;
1853
1854         switch (mid->mid_state) {
1855         case MID_RESPONSE_RECEIVED:
1856                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1857                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1858                 if (wdata->result != 0)
1859                         break;
1860
1861                 written = le32_to_cpu(rsp->DataLength);
1862                 /*
1863                  * Mask off high 16 bits when bytes written as returned
1864                  * by the server is greater than bytes requested by the
1865                  * client. OS/2 servers are known to set incorrect
1866                  * CountHigh values.
1867                  */
1868                 if (written > wdata->bytes)
1869                         written &= 0xFFFF;
1870
1871                 if (written < wdata->bytes)
1872                         wdata->result = -ENOSPC;
1873                 else
1874                         wdata->bytes = written;
1875                 break;
1876         case MID_REQUEST_SUBMITTED:
1877         case MID_RETRY_NEEDED:
1878                 wdata->result = -EAGAIN;
1879                 break;
1880         default:
1881                 wdata->result = -EIO;
1882                 break;
1883         }
1884
1885         if (wdata->result)
1886                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1887
1888         queue_work(cifsiod_wq, &wdata->work);
1889         DeleteMidQEntry(mid);
1890         add_credits(tcon->ses->server, credits_received, 0);
1891 }
1892
1893 /* smb2_async_writev - send an async write, and set up mid to handle result */
1894 int
1895 smb2_async_writev(struct cifs_writedata *wdata,
1896                   void (*release)(struct kref *kref))
1897 {
1898         int rc = -EACCES;
1899         struct smb2_write_req *req = NULL;
1900         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1901         struct kvec iov;
1902         struct smb_rqst rqst;
1903
1904         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1905         if (rc)
1906                 goto async_writev_out;
1907
1908         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1909
1910         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1911         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1912         req->WriteChannelInfoOffset = 0;
1913         req->WriteChannelInfoLength = 0;
1914         req->Channel = 0;
1915         req->Offset = cpu_to_le64(wdata->offset);
1916         /* 4 for rfc1002 length field */
1917         req->DataOffset = cpu_to_le16(
1918                                 offsetof(struct smb2_write_req, Buffer) - 4);
1919         req->RemainingBytes = 0;
1920
1921         /* 4 for rfc1002 length field and 1 for Buffer */
1922         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1923         iov.iov_base = req;
1924
1925         rqst.rq_iov = &iov;
1926         rqst.rq_nvec = 1;
1927         rqst.rq_pages = wdata->pages;
1928         rqst.rq_npages = wdata->nr_pages;
1929         rqst.rq_pagesz = wdata->pagesz;
1930         rqst.rq_tailsz = wdata->tailsz;
1931
1932         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1933                  wdata->offset, wdata->bytes);
1934
1935         req->Length = cpu_to_le32(wdata->bytes);
1936
1937         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1938
1939         kref_get(&wdata->refcount);
1940         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1941                                 smb2_writev_callback, wdata, 0);
1942
1943         if (rc) {
1944                 kref_put(&wdata->refcount, release);
1945                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1946         }
1947
1948 async_writev_out:
1949         cifs_small_buf_release(req);
1950         return rc;
1951 }
1952
1953 /*
1954  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1955  * The length field from io_parms must be at least 1 and indicates a number of
1956  * elements with data to write that begins with position 1 in iov array. All
1957  * data length is specified by count.
1958  */
1959 int
1960 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1961            unsigned int *nbytes, struct kvec *iov, int n_vec)
1962 {
1963         int rc = 0;
1964         struct smb2_write_req *req = NULL;
1965         struct smb2_write_rsp *rsp = NULL;
1966         int resp_buftype;
1967         *nbytes = 0;
1968
1969         if (n_vec < 1)
1970                 return rc;
1971
1972         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1973         if (rc)
1974                 return rc;
1975
1976         if (io_parms->tcon->ses->server == NULL)
1977                 return -ECONNABORTED;
1978
1979         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1980
1981         req->PersistentFileId = io_parms->persistent_fid;
1982         req->VolatileFileId = io_parms->volatile_fid;
1983         req->WriteChannelInfoOffset = 0;
1984         req->WriteChannelInfoLength = 0;
1985         req->Channel = 0;
1986         req->Length = cpu_to_le32(io_parms->length);
1987         req->Offset = cpu_to_le64(io_parms->offset);
1988         /* 4 for rfc1002 length field */
1989         req->DataOffset = cpu_to_le16(
1990                                 offsetof(struct smb2_write_req, Buffer) - 4);
1991         req->RemainingBytes = 0;
1992
1993         iov[0].iov_base = (char *)req;
1994         /* 4 for rfc1002 length field and 1 for Buffer */
1995         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1996
1997         /* length of entire message including data to be written */
1998         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1999
2000         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2001                           &resp_buftype, 0);
2002         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2003
2004         if (rc) {
2005                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2006                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2007         } else
2008                 *nbytes = le32_to_cpu(rsp->DataLength);
2009
2010         free_rsp_buf(resp_buftype, rsp);
2011         return rc;
2012 }
2013
2014 static unsigned int
2015 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2016 {
2017         int len;
2018         unsigned int entrycount = 0;
2019         unsigned int next_offset = 0;
2020         FILE_DIRECTORY_INFO *entryptr;
2021
2022         if (bufstart == NULL)
2023                 return 0;
2024
2025         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2026
2027         while (1) {
2028                 entryptr = (FILE_DIRECTORY_INFO *)
2029                                         ((char *)entryptr + next_offset);
2030
2031                 if ((char *)entryptr + size > end_of_buf) {
2032                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2033                         break;
2034                 }
2035
2036                 len = le32_to_cpu(entryptr->FileNameLength);
2037                 if ((char *)entryptr + len + size > end_of_buf) {
2038                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2039                                  end_of_buf);
2040                         break;
2041                 }
2042
2043                 *lastentry = (char *)entryptr;
2044                 entrycount++;
2045
2046                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2047                 if (!next_offset)
2048                         break;
2049         }
2050
2051         return entrycount;
2052 }
2053
2054 /*
2055  * Readdir/FindFirst
2056  */
2057 int
2058 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2059                      u64 persistent_fid, u64 volatile_fid, int index,
2060                      struct cifs_search_info *srch_inf)
2061 {
2062         struct smb2_query_directory_req *req;
2063         struct smb2_query_directory_rsp *rsp = NULL;
2064         struct kvec iov[2];
2065         int rc = 0;
2066         int len;
2067         int resp_buftype;
2068         unsigned char *bufptr;
2069         struct TCP_Server_Info *server;
2070         struct cifs_ses *ses = tcon->ses;
2071         __le16 asteriks = cpu_to_le16('*');
2072         char *end_of_smb;
2073         unsigned int output_size = CIFSMaxBufSize;
2074         size_t info_buf_size;
2075
2076         if (ses && (ses->server))
2077                 server = ses->server;
2078         else
2079                 return -EIO;
2080
2081         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2082         if (rc)
2083                 return rc;
2084
2085         switch (srch_inf->info_level) {
2086         case SMB_FIND_FILE_DIRECTORY_INFO:
2087                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2088                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2089                 break;
2090         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2091                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2092                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2093                 break;
2094         default:
2095                 cifs_dbg(VFS, "info level %u isn't supported\n",
2096                          srch_inf->info_level);
2097                 rc = -EINVAL;
2098                 goto qdir_exit;
2099         }
2100
2101         req->FileIndex = cpu_to_le32(index);
2102         req->PersistentFileId = persistent_fid;
2103         req->VolatileFileId = volatile_fid;
2104
2105         len = 0x2;
2106         bufptr = req->Buffer;
2107         memcpy(bufptr, &asteriks, len);
2108
2109         req->FileNameOffset =
2110                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2111         req->FileNameLength = cpu_to_le16(len);
2112         /*
2113          * BB could be 30 bytes or so longer if we used SMB2 specific
2114          * buffer lengths, but this is safe and close enough.
2115          */
2116         output_size = min_t(unsigned int, output_size, server->maxBuf);
2117         output_size = min_t(unsigned int, output_size, 2 << 15);
2118         req->OutputBufferLength = cpu_to_le32(output_size);
2119
2120         iov[0].iov_base = (char *)req;
2121         /* 4 for RFC1001 length and 1 for Buffer */
2122         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2123
2124         iov[1].iov_base = (char *)(req->Buffer);
2125         iov[1].iov_len = len;
2126
2127         inc_rfc1001_len(req, len - 1 /* Buffer */);
2128
2129         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2130         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2131
2132         if (rc) {
2133                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2134                 goto qdir_exit;
2135         }
2136
2137         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2138                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2139                           info_buf_size);
2140         if (rc)
2141                 goto qdir_exit;
2142
2143         srch_inf->unicode = true;
2144
2145         if (srch_inf->ntwrk_buf_start) {
2146                 if (srch_inf->smallBuf)
2147                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2148                 else
2149                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2150         }
2151         srch_inf->ntwrk_buf_start = (char *)rsp;
2152         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2153                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2154         /* 4 for rfc1002 length field */
2155         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2156         srch_inf->entries_in_buffer =
2157                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2158                                     &srch_inf->last_entry, info_buf_size);
2159         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2160         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2161                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2162                  srch_inf->srch_entries_start, srch_inf->last_entry);
2163         if (resp_buftype == CIFS_LARGE_BUFFER)
2164                 srch_inf->smallBuf = false;
2165         else if (resp_buftype == CIFS_SMALL_BUFFER)
2166                 srch_inf->smallBuf = true;
2167         else
2168                 cifs_dbg(VFS, "illegal search buffer type\n");
2169
2170         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2171                 srch_inf->endOfSearch = 1;
2172         else
2173                 srch_inf->endOfSearch = 0;
2174
2175         return rc;
2176
2177 qdir_exit:
2178         free_rsp_buf(resp_buftype, rsp);
2179         return rc;
2180 }
2181
2182 static int
2183 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2184                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2185                unsigned int num, void **data, unsigned int *size)
2186 {
2187         struct smb2_set_info_req *req;
2188         struct smb2_set_info_rsp *rsp = NULL;
2189         struct kvec *iov;
2190         int rc = 0;
2191         int resp_buftype;
2192         unsigned int i;
2193         struct TCP_Server_Info *server;
2194         struct cifs_ses *ses = tcon->ses;
2195
2196         if (ses && (ses->server))
2197                 server = ses->server;
2198         else
2199                 return -EIO;
2200
2201         if (!num)
2202                 return -EINVAL;
2203
2204         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2205         if (!iov)
2206                 return -ENOMEM;
2207
2208         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2209         if (rc) {
2210                 kfree(iov);
2211                 return rc;
2212         }
2213
2214         req->hdr.ProcessId = cpu_to_le32(pid);
2215
2216         req->InfoType = SMB2_O_INFO_FILE;
2217         req->FileInfoClass = info_class;
2218         req->PersistentFileId = persistent_fid;
2219         req->VolatileFileId = volatile_fid;
2220
2221         /* 4 for RFC1001 length and 1 for Buffer */
2222         req->BufferOffset =
2223                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2224         req->BufferLength = cpu_to_le32(*size);
2225
2226         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2227
2228         memcpy(req->Buffer, *data, *size);
2229
2230         iov[0].iov_base = (char *)req;
2231         /* 4 for RFC1001 length */
2232         iov[0].iov_len = get_rfc1002_length(req) + 4;
2233
2234         for (i = 1; i < num; i++) {
2235                 inc_rfc1001_len(req, size[i]);
2236                 le32_add_cpu(&req->BufferLength, size[i]);
2237                 iov[i].iov_base = (char *)data[i];
2238                 iov[i].iov_len = size[i];
2239         }
2240
2241         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2242         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2243
2244         if (rc != 0)
2245                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2246
2247         free_rsp_buf(resp_buftype, rsp);
2248         kfree(iov);
2249         return rc;
2250 }
2251
2252 int
2253 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2254             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2255 {
2256         struct smb2_file_rename_info info;
2257         void **data;
2258         unsigned int size[2];
2259         int rc;
2260         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2261
2262         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2263         if (!data)
2264                 return -ENOMEM;
2265
2266         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2267                               /* 0 = fail if target already exists */
2268         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2269         info.FileNameLength = cpu_to_le32(len);
2270
2271         data[0] = &info;
2272         size[0] = sizeof(struct smb2_file_rename_info);
2273
2274         data[1] = target_file;
2275         size[1] = len + 2 /* null */;
2276
2277         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2278                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2279                            size);
2280         kfree(data);
2281         return rc;
2282 }
2283
2284 int
2285 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2286                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2287 {
2288         struct smb2_file_link_info info;
2289         void **data;
2290         unsigned int size[2];
2291         int rc;
2292         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2293
2294         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2295         if (!data)
2296                 return -ENOMEM;
2297
2298         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2299                               /* 0 = fail if link already exists */
2300         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2301         info.FileNameLength = cpu_to_le32(len);
2302
2303         data[0] = &info;
2304         size[0] = sizeof(struct smb2_file_link_info);
2305
2306         data[1] = target_file;
2307         size[1] = len + 2 /* null */;
2308
2309         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2310                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2311         kfree(data);
2312         return rc;
2313 }
2314
2315 int
2316 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2317              u64 volatile_fid, u32 pid, __le64 *eof)
2318 {
2319         struct smb2_file_eof_info info;
2320         void *data;
2321         unsigned int size;
2322
2323         info.EndOfFile = *eof;
2324
2325         data = &info;
2326         size = sizeof(struct smb2_file_eof_info);
2327
2328         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2329                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2330 }
2331
2332 int
2333 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2334               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2335 {
2336         unsigned int size;
2337         size = sizeof(FILE_BASIC_INFO);
2338         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2339                              current->tgid, FILE_BASIC_INFORMATION, 1,
2340                              (void **)&buf, &size);
2341 }
2342
2343 int
2344 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2345                   const u64 persistent_fid, const u64 volatile_fid,
2346                   __u8 oplock_level)
2347 {
2348         int rc;
2349         struct smb2_oplock_break *req = NULL;
2350
2351         cifs_dbg(FYI, "SMB2_oplock_break\n");
2352         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2353
2354         if (rc)
2355                 return rc;
2356
2357         req->VolatileFid = volatile_fid;
2358         req->PersistentFid = persistent_fid;
2359         req->OplockLevel = oplock_level;
2360         req->hdr.CreditRequest = cpu_to_le16(1);
2361
2362         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2363         /* SMB2 buffer freed by function above */
2364
2365         if (rc) {
2366                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2367                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2368         }
2369
2370         return rc;
2371 }
2372
2373 static void
2374 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2375                         struct kstatfs *kst)
2376 {
2377         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2378                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2379         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2380         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2381         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2382         return;
2383 }
2384
2385 static int
2386 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2387                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2388 {
2389         int rc;
2390         struct smb2_query_info_req *req;
2391
2392         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2393
2394         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2395                 return -EIO;
2396
2397         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2398         if (rc)
2399                 return rc;
2400
2401         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2402         req->FileInfoClass = level;
2403         req->PersistentFileId = persistent_fid;
2404         req->VolatileFileId = volatile_fid;
2405         /* 4 for rfc1002 length field and 1 for pad */
2406         req->InputBufferOffset =
2407                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2408         req->OutputBufferLength = cpu_to_le32(
2409                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2410
2411         iov->iov_base = (char *)req;
2412         /* 4 for rfc1002 length field */
2413         iov->iov_len = get_rfc1002_length(req) + 4;
2414         return 0;
2415 }
2416
2417 int
2418 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2419               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2420 {
2421         struct smb2_query_info_rsp *rsp = NULL;
2422         struct kvec iov;
2423         int rc = 0;
2424         int resp_buftype;
2425         struct cifs_ses *ses = tcon->ses;
2426         struct smb2_fs_full_size_info *info = NULL;
2427
2428         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2429                                 sizeof(struct smb2_fs_full_size_info),
2430                                 persistent_fid, volatile_fid);
2431         if (rc)
2432                 return rc;
2433
2434         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2435         if (rc) {
2436                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2437                 goto qfsinf_exit;
2438         }
2439         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2440
2441         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2442                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2443         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2444                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2445                           sizeof(struct smb2_fs_full_size_info));
2446         if (!rc)
2447                 copy_fs_info_to_kstatfs(info, fsdata);
2448
2449 qfsinf_exit:
2450         free_rsp_buf(resp_buftype, iov.iov_base);
2451         return rc;
2452 }
2453
2454 int
2455 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2456               u64 persistent_fid, u64 volatile_fid, int level)
2457 {
2458         struct smb2_query_info_rsp *rsp = NULL;
2459         struct kvec iov;
2460         int rc = 0;
2461         int resp_buftype, max_len, min_len;
2462         struct cifs_ses *ses = tcon->ses;
2463         unsigned int rsp_len, offset;
2464
2465         if (level == FS_DEVICE_INFORMATION) {
2466                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2467                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2468         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2469                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2470                 min_len = MIN_FS_ATTR_INFO_SIZE;
2471         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2472                 max_len = sizeof(struct smb3_fs_ss_info);
2473                 min_len = sizeof(struct smb3_fs_ss_info);
2474         } else {
2475                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2476                 return -EINVAL;
2477         }
2478
2479         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2480                                 persistent_fid, volatile_fid);
2481         if (rc)
2482                 return rc;
2483
2484         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2485         if (rc) {
2486                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2487                 goto qfsattr_exit;
2488         }
2489         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2490
2491         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2492         offset = le16_to_cpu(rsp->OutputBufferOffset);
2493         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2494         if (rc)
2495                 goto qfsattr_exit;
2496
2497         if (level == FS_ATTRIBUTE_INFORMATION)
2498                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2499                         + (char *)&rsp->hdr, min_t(unsigned int,
2500                         rsp_len, max_len));
2501         else if (level == FS_DEVICE_INFORMATION)
2502                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2503                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2504         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2505                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2506                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2507                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2508                 tcon->perf_sector_size =
2509                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2510         }
2511
2512 qfsattr_exit:
2513         free_rsp_buf(resp_buftype, iov.iov_base);
2514         return rc;
2515 }
2516
2517 int
2518 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2519            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2520            const __u32 num_lock, struct smb2_lock_element *buf)
2521 {
2522         int rc = 0;
2523         struct smb2_lock_req *req = NULL;
2524         struct kvec iov[2];
2525         int resp_buf_type;
2526         unsigned int count;
2527
2528         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2529
2530         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2531         if (rc)
2532                 return rc;
2533
2534         req->hdr.ProcessId = cpu_to_le32(pid);
2535         req->LockCount = cpu_to_le16(num_lock);
2536
2537         req->PersistentFileId = persist_fid;
2538         req->VolatileFileId = volatile_fid;
2539
2540         count = num_lock * sizeof(struct smb2_lock_element);
2541         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2542
2543         iov[0].iov_base = (char *)req;
2544         /* 4 for rfc1002 length field and count for all locks */
2545         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2546         iov[1].iov_base = (char *)buf;
2547         iov[1].iov_len = count;
2548
2549         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2550         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2551         if (rc) {
2552                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2553                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2554         }
2555
2556         return rc;
2557 }
2558
2559 int
2560 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2561           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2562           const __u64 length, const __u64 offset, const __u32 lock_flags,
2563           const bool wait)
2564 {
2565         struct smb2_lock_element lock;
2566
2567         lock.Offset = cpu_to_le64(offset);
2568         lock.Length = cpu_to_le64(length);
2569         lock.Flags = cpu_to_le32(lock_flags);
2570         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2571                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2572
2573         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2574 }
2575
2576 int
2577 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2578                  __u8 *lease_key, const __le32 lease_state)
2579 {
2580         int rc;
2581         struct smb2_lease_ack *req = NULL;
2582
2583         cifs_dbg(FYI, "SMB2_lease_break\n");
2584         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2585
2586         if (rc)
2587                 return rc;
2588
2589         req->hdr.CreditRequest = cpu_to_le16(1);
2590         req->StructureSize = cpu_to_le16(36);
2591         inc_rfc1001_len(req, 12);
2592
2593         memcpy(req->LeaseKey, lease_key, 16);
2594         req->LeaseState = lease_state;
2595
2596         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2597         /* SMB2 buffer freed by function above */
2598
2599         if (rc) {
2600                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2601                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2602         }
2603
2604         return rc;
2605 }