fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server = ses->server;
 468         u16 blob_length = 0;
 469         char *security_blob;
 470         char *ntlmssp_blob = NULL;
 471         bool use_spnego = false; /* else use raw ntlmssp */
 472
 473         cifs_dbg(FYI, "Session Setup\n");
 474
 475         if (!server) {
 476                 WARN(1, "%s: server is NULL!\n", __func__);
 477                 return -EIO;
 478         }
 479
 480         /*
 481          * If memory allocation is successful, caller of this function
 482          * frees it.
 483          */
 484         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 485         if (!ses->ntlmssp)
 486                 return -ENOMEM;
 487
 488         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 489         ses->sectype = RawNTLMSSP;
 490
 491 ssetup_ntlmssp_authenticate:
 492         if (phase == NtLmChallenge)
 493                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 494
 495         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 496         if (rc)
 497                 return rc;
 498
 499         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 500         req->VcNumber = 0; /* MBZ */
 501         /* to enable echos and oplocks */
 502         req->hdr.CreditRequest = cpu_to_le16(3);
 503
 504         /* only one of SMB2 signing flags may be set in SMB2 request */
 505         if (server->sign)
 506                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 507         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 508                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 509         else
 510                 req->SecurityMode = 0;
 511
 512         req->Capabilities = 0;
 513         req->Channel = 0; /* MBZ */
 514
 515         iov[0].iov_base = (char *)req;
 516         /* 4 for rfc1002 length field and 1 for pad */
 517         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 518         if (phase == NtLmNegotiate) {
 519                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 520                                        GFP_KERNEL);
 521                 if (ntlmssp_blob == NULL) {
 522                         rc = -ENOMEM;
 523                         goto ssetup_exit;
 524                 }
 525                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 526                 if (use_spnego) {
 527                         /* blob_length = build_spnego_ntlmssp_blob(
 528                                         &security_blob,
 529                                         sizeof(struct _NEGOTIATE_MESSAGE),
 530                                         ntlmssp_blob); */
 531                         /* BB eventually need to add this */
 532                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 533                         rc = -EOPNOTSUPP;
 534                         kfree(ntlmssp_blob);
 535                         goto ssetup_exit;
 536                 } else {
 537                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 538                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 539                         security_blob = ntlmssp_blob;
 540                 }
 541         } else if (phase == NtLmAuthenticate) {
 542                 req->hdr.SessionId = ses->Suid;
 543                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 544                                        GFP_KERNEL);
 545                 if (ntlmssp_blob == NULL) {
 546                         rc = -ENOMEM;
 547                         goto ssetup_exit;
 548                 }
 549                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 550                                              nls_cp);
 551                 if (rc) {
 552                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 553                                  rc);
 554                         goto ssetup_exit; /* BB double check error handling */
 555                 }
 556                 if (use_spnego) {
 557                         /* blob_length = build_spnego_ntlmssp_blob(
 558                                                         &security_blob,
 559                                                         blob_length,
 560                                                         ntlmssp_blob); */
 561                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 562                         rc = -EOPNOTSUPP;
 563                         kfree(ntlmssp_blob);
 564                         goto ssetup_exit;
 565                 } else {
 566                         security_blob = ntlmssp_blob;
 567                 }
 568         } else {
 569                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 570                 rc = -EIO;
 571                 goto ssetup_exit;
 572         }
 573
 574         /* Testing shows that buffer offset must be at location of Buffer[0] */
 575         req->SecurityBufferOffset =
 576                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 577                                             1 /* pad */ - 4 /* rfc1001 len */);
 578         req->SecurityBufferLength = cpu_to_le16(blob_length);
 579         iov[1].iov_base = security_blob;
 580         iov[1].iov_len = blob_length;
 581
 582         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 583
 584         /* BB add code to build os and lm fields */
 585
 586         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 587                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 588
 589         kfree(security_blob);
 590         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 591         if (resp_buftype != CIFS_NO_BUFFER &&
 592             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 593                 if (phase != NtLmNegotiate) {
 594                         cifs_dbg(VFS, "Unexpected more processing error\n");
 595                         goto ssetup_exit;
 596                 }
 597                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 598                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 599                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 600                                  le16_to_cpu(rsp->SecurityBufferOffset));
 601                         rc = -EIO;
 602                         goto ssetup_exit;
 603                 }
 604
 605                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 606                 phase = NtLmChallenge; /* process ntlmssp challenge */
 607                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 608                 ses->Suid = rsp->hdr.SessionId;
 609                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 610                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 611         }
 612
 613         /*
 614          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 615          * but at least the raw NTLMSSP case works.
 616          */
 617         /*
 618          * No tcon so can't do
 619          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 620          */
 621         if (rc != 0)
 622                 goto ssetup_exit;
 623
 624         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 625 ssetup_exit:
 626         free_rsp_buf(resp_buftype, rsp);
 627
 628         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 629         if ((phase == NtLmChallenge) && (rc == 0))
 630                 goto ssetup_ntlmssp_authenticate;
 631         return rc;
 632 }
 633
 634 int
 635 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 636 {
 637         struct smb2_logoff_req *req; /* response is also trivial struct */
 638         int rc = 0;
 639         struct TCP_Server_Info *server;
 640
 641         cifs_dbg(FYI, "disconnect session %p\n", ses);
 642
 643         if (ses && (ses->server))
 644                 server = ses->server;
 645         else
 646                 return -EIO;
 647
 648         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 649         if (rc)
 650                 return rc;
 651
 652          /* since no tcon, smb2_init can not do this, so do here */
 653         req->hdr.SessionId = ses->Suid;
 654         if (server->sign)
 655                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 656
 657         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 658         /*
 659          * No tcon so can't do
 660          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 661          */
 662         return rc;
 663 }
 664
 665 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 666 {
 667         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 668 }
 669
 670 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 671
 672 int
 673 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 674           struct cifs_tcon *tcon, const struct nls_table *cp)
 675 {
 676         struct smb2_tree_connect_req *req;
 677         struct smb2_tree_connect_rsp *rsp = NULL;
 678         struct kvec iov[2];
 679         int rc = 0;
 680         int resp_buftype;
 681         int unc_path_len;
 682         struct TCP_Server_Info *server;
 683         __le16 *unc_path = NULL;
 684
 685         cifs_dbg(FYI, "TCON\n");
 686
 687         if ((ses->server) && tree)
 688                 server = ses->server;
 689         else
 690                 return -EIO;
 691
 692         if (tcon && tcon->bad_network_name)
 693                 return -ENOENT;
 694
 695         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 696         if (unc_path == NULL)
 697                 return -ENOMEM;
 698
 699         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 700         unc_path_len *= 2;
 701         if (unc_path_len < 2) {
 702                 kfree(unc_path);
 703                 return -EINVAL;
 704         }
 705
 706         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 707         if (rc) {
 708                 kfree(unc_path);
 709                 return rc;
 710         }
 711
 712         if (tcon == NULL) {
 713                 /* since no tcon, smb2_init can not do this, so do here */
 714                 req->hdr.SessionId = ses->Suid;
 715                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 716                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 717         }
 718
 719         iov[0].iov_base = (char *)req;
 720         /* 4 for rfc1002 length field and 1 for pad */
 721         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 722
 723         /* Testing shows that buffer offset must be at location of Buffer[0] */
 724         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 725                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 726         req->PathLength = cpu_to_le16(unc_path_len - 2);
 727         iov[1].iov_base = unc_path;
 728         iov[1].iov_len = unc_path_len;
 729
 730         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 731
 732         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 733         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 734
 735         if (rc != 0) {
 736                 if (tcon) {
 737                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 738                         tcon->need_reconnect = true;
 739                 }
 740                 goto tcon_error_exit;
 741         }
 742
 743         if (tcon == NULL) {
 744                 ses->ipc_tid = rsp->hdr.TreeId;
 745                 goto tcon_exit;
 746         }
 747
 748         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 749                 cifs_dbg(FYI, "connection to disk share\n");
 750         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 751                 tcon->ipc = true;
 752                 cifs_dbg(FYI, "connection to pipe share\n");
 753         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 754                 tcon->print = true;
 755                 cifs_dbg(FYI, "connection to printer\n");
 756         } else {
 757                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 758                 rc = -EOPNOTSUPP;
 759                 goto tcon_error_exit;
 760         }
 761
 762         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 763         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 764         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 765         tcon->tidStatus = CifsGood;
 766         tcon->need_reconnect = false;
 767         tcon->tid = rsp->hdr.TreeId;
 768         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 769
 770         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 771             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 772                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 773
 774 tcon_exit:
 775         free_rsp_buf(resp_buftype, rsp);
 776         kfree(unc_path);
 777         return rc;
 778
 779 tcon_error_exit:
 780         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 781                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 782                 tcon->bad_network_name = true;
 783         }
 784         goto tcon_exit;
 785 }
 786
 787 int
 788 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 789 {
 790         struct smb2_tree_disconnect_req *req; /* response is trivial */
 791         int rc = 0;
 792         struct TCP_Server_Info *server;
 793         struct cifs_ses *ses = tcon->ses;
 794
 795         cifs_dbg(FYI, "Tree Disconnect\n");
 796
 797         if (ses && (ses->server))
 798                 server = ses->server;
 799         else
 800                 return -EIO;
 801
 802         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 803                 return 0;
 804
 805         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 806         if (rc)
 807                 return rc;
 808
 809         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 810         if (rc)
 811                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 812
 813         return rc;
 814 }
 815
 816 static struct create_lease *
 817 create_lease_buf(u8 *lease_key, u8 oplock)
 818 {
 819         struct create_lease *buf;
 820
 821         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 822         if (!buf)
 823                 return NULL;
 824
 825         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 826         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 827         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 828                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 829                                            SMB2_LEASE_READ_CACHING;
 830         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 831                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 832         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 833                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 834                                            SMB2_LEASE_READ_CACHING |
 835                                            SMB2_LEASE_WRITE_CACHING;
 836
 837         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 838                                         (struct create_lease, lcontext));
 839         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 840         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 841                                 (struct create_lease, Name));
 842         buf->ccontext.NameLength = cpu_to_le16(4);
 843         buf->Name[0] = 'R';
 844         buf->Name[1] = 'q';
 845         buf->Name[2] = 'L';
 846         buf->Name[3] = 's';
 847         return buf;
 848 }
 849
 850 static __u8
 851 parse_lease_state(struct smb2_create_rsp *rsp)
 852 {
 853         char *data_offset;
 854         struct create_lease *lc;
 855         bool found = false;
 856
 857         data_offset = (char *)rsp;
 858         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 859         lc = (struct create_lease *)data_offset;
 860         do {
 861                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 862                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 863                     strncmp(name, "RqLs", 4)) {
 864                         lc = (struct create_lease *)((char *)lc
 865                                         + le32_to_cpu(lc->ccontext.Next));
 866                         continue;
 867                 }
 868                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 869                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 870                 found = true;
 871                 break;
 872         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 873
 874         if (!found)
 875                 return 0;
 876
 877         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 878 }
 879
 880 int
 881 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 882           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 883           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 884           __u8 *oplock, struct smb2_file_all_info *buf)
 885 {
 886         struct smb2_create_req *req;
 887         struct smb2_create_rsp *rsp;
 888         struct TCP_Server_Info *server;
 889         struct cifs_ses *ses = tcon->ses;
 890         struct kvec iov[3];
 891         int resp_buftype;
 892         int uni_path_len;
 893         __le16 *copy_path = NULL;
 894         int copy_size;
 895         int rc = 0;
 896         int num_iovecs = 2;
 897
 898         cifs_dbg(FYI, "create/open\n");
 899
 900         if (ses && (ses->server))
 901                 server = ses->server;
 902         else
 903                 return -EIO;
 904
 905         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 906         if (rc)
 907                 return rc;
 908
 909         req->ImpersonationLevel = IL_IMPERSONATION;
 910         req->DesiredAccess = cpu_to_le32(desired_access);
 911         /* File attributes ignored on open (used in create though) */
 912         req->FileAttributes = cpu_to_le32(file_attributes);
 913         req->ShareAccess = FILE_SHARE_ALL_LE;
 914         req->CreateDisposition = cpu_to_le32(create_disposition);
 915         req->CreateOptions = cpu_to_le32(create_options);
 916         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 917         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 918                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 919
 920         iov[0].iov_base = (char *)req;
 921         /* 4 for rfc1002 length field */
 922         iov[0].iov_len = get_rfc1002_length(req) + 4;
 923
 924         /* MUST set path len (NameLength) to 0 opening root of share */
 925         if (uni_path_len >= 4) {
 926                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 927                 /* -1 since last byte is buf[0] which is sent below (path) */
 928                 iov[0].iov_len--;
 929                 if (uni_path_len % 8 != 0) {
 930                         copy_size = uni_path_len / 8 * 8;
 931                         if (copy_size < uni_path_len)
 932                                 copy_size += 8;
 933
 934                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 935                         if (!copy_path)
 936                                 return -ENOMEM;
 937                         memcpy((char *)copy_path, (const char *)path,
 938                                 uni_path_len);
 939                         uni_path_len = copy_size;
 940                         path = copy_path;
 941                 }
 942
 943                 iov[1].iov_len = uni_path_len;
 944                 iov[1].iov_base = path;
 945                 /*
 946                  * -1 since last byte is buf[0] which was counted in
 947                  * smb2_buf_len.
 948                  */
 949                 inc_rfc1001_len(req, uni_path_len - 1);
 950         } else {
 951                 iov[0].iov_len += 7;
 952                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 953                                 req->hdr.smb2_buf_length) + 8 - 1);
 954                 num_iovecs = 1;
 955                 req->NameLength = 0;
 956         }
 957
 958         if (!server->oplocks)
 959                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 960
 961         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 962             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 963                 req->RequestedOplockLevel = *oplock;
 964         else {
 965                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 966                 if (iov[num_iovecs].iov_base == NULL) {
 967                         cifs_small_buf_release(req);
 968                         kfree(copy_path);
 969                         return -ENOMEM;
 970                 }
 971                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
 972                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 973                 req->CreateContextsOffset = cpu_to_le32(
 974                         sizeof(struct smb2_create_req) - 4 - 8 +
 975                         iov[num_iovecs-1].iov_len);
 976                 req->CreateContextsLength = cpu_to_le32(
 977                         sizeof(struct create_lease));
 978                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 979                 num_iovecs++;
 980         }
 981
 982         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 983         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 984
 985         if (rc != 0) {
 986                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 987                 goto creat_exit;
 988         }
 989
 990         *persistent_fid = rsp->PersistentFileId;
 991         *volatile_fid = rsp->VolatileFileId;
 992
 993         if (buf) {
 994                 memcpy(buf, &rsp->CreationTime, 32);
 995                 buf->AllocationSize = rsp->AllocationSize;
 996                 buf->EndOfFile = rsp->EndofFile;
 997                 buf->Attributes = rsp->FileAttributes;
 998                 buf->NumberOfLinks = cpu_to_le32(1);
 999                 buf->DeletePending = 0;
1000         }
1001
1002         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1003                 *oplock = parse_lease_state(rsp);
1004         else
1005                 *oplock = rsp->OplockLevel;
1006 creat_exit:
1007         kfree(copy_path);
1008         free_rsp_buf(resp_buftype, rsp);
1009         return rc;
1010 }
1011
1012 /*
1013  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1014  */
1015 int
1016 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1017            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1018            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1019 {
1020         struct smb2_ioctl_req *req;
1021         struct smb2_ioctl_rsp *rsp;
1022         struct TCP_Server_Info *server;
1023         struct cifs_ses *ses = tcon->ses;
1024         struct kvec iov[2];
1025         int resp_buftype;
1026         int num_iovecs;
1027         int rc = 0;
1028
1029         cifs_dbg(FYI, "SMB2 IOCTL\n");
1030
1031         /* zero out returned data len, in case of error */
1032         if (plen)
1033                 *plen = 0;
1034
1035         if (ses && (ses->server))
1036                 server = ses->server;
1037         else
1038                 return -EIO;
1039
1040         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1041         if (rc)
1042                 return rc;
1043
1044         req->CtlCode = cpu_to_le32(opcode);
1045         req->PersistentFileId = persistent_fid;
1046         req->VolatileFileId = volatile_fid;
1047
1048         if (indatalen) {
1049                 req->InputCount = cpu_to_le32(indatalen);
1050                 /* do not set InputOffset if no input data */
1051                 req->InputOffset =
1052                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1053                 iov[1].iov_base = in_data;
1054                 iov[1].iov_len = indatalen;
1055                 num_iovecs = 2;
1056         } else
1057                 num_iovecs = 1;
1058
1059         req->OutputOffset = 0;
1060         req->OutputCount = 0; /* MBZ */
1061
1062         /*
1063          * Could increase MaxOutputResponse, but that would require more
1064          * than one credit. Windows typically sets this smaller, but for some
1065          * ioctls it may be useful to allow server to send more. No point
1066          * limiting what the server can send as long as fits in one credit
1067          */
1068         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1069
1070         if (is_fsctl)
1071                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1072         else
1073                 req->Flags = 0;
1074
1075         iov[0].iov_base = (char *)req;
1076         /* 4 for rfc1002 length field */
1077         iov[0].iov_len = get_rfc1002_length(req) + 4;
1078
1079         if (indatalen)
1080                 inc_rfc1001_len(req, indatalen);
1081
1082         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1083         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1084
1085         if (rc != 0) {
1086                 if (tcon)
1087                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1088                 goto ioctl_exit;
1089         }
1090
1091         /* check if caller wants to look at return data or just return rc */
1092         if ((plen == NULL) || (out_data == NULL))
1093                 goto ioctl_exit;
1094
1095         *plen = le32_to_cpu(rsp->OutputCount);
1096
1097         /* We check for obvious errors in the output buffer length and offset */
1098         if (*plen == 0)
1099                 goto ioctl_exit; /* server returned no data */
1100         else if (*plen > 0xFF00) {
1101                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1102                 *plen = 0;
1103                 rc = -EIO;
1104                 goto ioctl_exit;
1105         }
1106
1107         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1108                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1109                         le32_to_cpu(rsp->OutputOffset));
1110                 *plen = 0;
1111                 rc = -EIO;
1112                 goto ioctl_exit;
1113         }
1114
1115         *out_data = kmalloc(*plen, GFP_KERNEL);
1116         if (*out_data == NULL) {
1117                 rc = -ENOMEM;
1118                 goto ioctl_exit;
1119         }
1120
1121         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1122                *plen);
1123 ioctl_exit:
1124         free_rsp_buf(resp_buftype, rsp);
1125         return rc;
1126 }
1127
1128 int
1129 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1130            u64 persistent_fid, u64 volatile_fid)
1131 {
1132         struct smb2_close_req *req;
1133         struct smb2_close_rsp *rsp;
1134         struct TCP_Server_Info *server;
1135         struct cifs_ses *ses = tcon->ses;
1136         struct kvec iov[1];
1137         int resp_buftype;
1138         int rc = 0;
1139
1140         cifs_dbg(FYI, "Close\n");
1141
1142         if (ses && (ses->server))
1143                 server = ses->server;
1144         else
1145                 return -EIO;
1146
1147         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1148         if (rc)
1149                 return rc;
1150
1151         req->PersistentFileId = persistent_fid;
1152         req->VolatileFileId = volatile_fid;
1153
1154         iov[0].iov_base = (char *)req;
1155         /* 4 for rfc1002 length field */
1156         iov[0].iov_len = get_rfc1002_length(req) + 4;
1157
1158         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1159         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1160
1161         if (rc != 0) {
1162                 if (tcon)
1163                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1164                 goto close_exit;
1165         }
1166
1167         /* BB FIXME - decode close response, update inode for caching */
1168
1169 close_exit:
1170         free_rsp_buf(resp_buftype, rsp);
1171         return rc;
1172 }
1173
1174 static int
1175 validate_buf(unsigned int offset, unsigned int buffer_length,
1176              struct smb2_hdr *hdr, unsigned int min_buf_size)
1177
1178 {
1179         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1180         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1181         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1182         char *end_of_buf = begin_of_buf + buffer_length;
1183
1184
1185         if (buffer_length < min_buf_size) {
1186                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1187                          buffer_length, min_buf_size);
1188                 return -EINVAL;
1189         }
1190
1191         /* check if beyond RFC1001 maximum length */
1192         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1193                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1194                          buffer_length, smb_len);
1195                 return -EINVAL;
1196         }
1197
1198         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1199                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1200                 return -EINVAL;
1201         }
1202
1203         return 0;
1204 }
1205
1206 /*
1207  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1208  * Caller must free buffer.
1209  */
1210 static int
1211 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1212                       struct smb2_hdr *hdr, unsigned int minbufsize,
1213                       char *data)
1214
1215 {
1216         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1217         int rc;
1218
1219         if (!data)
1220                 return -EINVAL;
1221
1222         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1223         if (rc)
1224                 return rc;
1225
1226         memcpy(data, begin_of_buf, buffer_length);
1227
1228         return 0;
1229 }
1230
1231 static int
1232 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1233            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1234            size_t output_len, size_t min_len, void *data)
1235 {
1236         struct smb2_query_info_req *req;
1237         struct smb2_query_info_rsp *rsp = NULL;
1238         struct kvec iov[2];
1239         int rc = 0;
1240         int resp_buftype;
1241         struct TCP_Server_Info *server;
1242         struct cifs_ses *ses = tcon->ses;
1243
1244         cifs_dbg(FYI, "Query Info\n");
1245
1246         if (ses && (ses->server))
1247                 server = ses->server;
1248         else
1249                 return -EIO;
1250
1251         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1252         if (rc)
1253                 return rc;
1254
1255         req->InfoType = SMB2_O_INFO_FILE;
1256         req->FileInfoClass = info_class;
1257         req->PersistentFileId = persistent_fid;
1258         req->VolatileFileId = volatile_fid;
1259         /* 4 for rfc1002 length field and 1 for Buffer */
1260         req->InputBufferOffset =
1261                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1262         req->OutputBufferLength = cpu_to_le32(output_len);
1263
1264         iov[0].iov_base = (char *)req;
1265         /* 4 for rfc1002 length field */
1266         iov[0].iov_len = get_rfc1002_length(req) + 4;
1267
1268         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1269         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1270
1271         if (rc) {
1272                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1273                 goto qinf_exit;
1274         }
1275
1276         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1277                                    le32_to_cpu(rsp->OutputBufferLength),
1278                                    &rsp->hdr, min_len, data);
1279
1280 qinf_exit:
1281         free_rsp_buf(resp_buftype, rsp);
1282         return rc;
1283 }
1284
1285 int
1286 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1287                 u64 persistent_fid, u64 volatile_fid,
1288                 struct smb2_file_all_info *data)
1289 {
1290         return query_info(xid, tcon, persistent_fid, volatile_fid,
1291                           FILE_ALL_INFORMATION,
1292                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1293                           sizeof(struct smb2_file_all_info), data);
1294 }
1295
1296 int
1297 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1298                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1299 {
1300         return query_info(xid, tcon, persistent_fid, volatile_fid,
1301                           FILE_INTERNAL_INFORMATION,
1302                           sizeof(struct smb2_file_internal_info),
1303                           sizeof(struct smb2_file_internal_info), uniqueid);
1304 }
1305
1306 /*
1307  * This is a no-op for now. We're not really interested in the reply, but
1308  * rather in the fact that the server sent one and that server->lstrp
1309  * gets updated.
1310  *
1311  * FIXME: maybe we should consider checking that the reply matches request?
1312  */
1313 static void
1314 smb2_echo_callback(struct mid_q_entry *mid)
1315 {
1316         struct TCP_Server_Info *server = mid->callback_data;
1317         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1318         unsigned int credits_received = 1;
1319
1320         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1321                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1322
1323         DeleteMidQEntry(mid);
1324         add_credits(server, credits_received, CIFS_ECHO_OP);
1325 }
1326
1327 int
1328 SMB2_echo(struct TCP_Server_Info *server)
1329 {
1330         struct smb2_echo_req *req;
1331         int rc = 0;
1332         struct kvec iov;
1333         struct smb_rqst rqst = { .rq_iov = &iov,
1334                                  .rq_nvec = 1 };
1335
1336         cifs_dbg(FYI, "In echo request\n");
1337
1338         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1339         if (rc)
1340                 return rc;
1341
1342         req->hdr.CreditRequest = cpu_to_le16(1);
1343
1344         iov.iov_base = (char *)req;
1345         /* 4 for rfc1002 length field */
1346         iov.iov_len = get_rfc1002_length(req) + 4;
1347
1348         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1349                              CIFS_ECHO_OP);
1350         if (rc)
1351                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1352
1353         cifs_small_buf_release(req);
1354         return rc;
1355 }
1356
1357 int
1358 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1359            u64 volatile_fid)
1360 {
1361         struct smb2_flush_req *req;
1362         struct TCP_Server_Info *server;
1363         struct cifs_ses *ses = tcon->ses;
1364         struct kvec iov[1];
1365         int resp_buftype;
1366         int rc = 0;
1367
1368         cifs_dbg(FYI, "Flush\n");
1369
1370         if (ses && (ses->server))
1371                 server = ses->server;
1372         else
1373                 return -EIO;
1374
1375         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1376         if (rc)
1377                 return rc;
1378
1379         req->PersistentFileId = persistent_fid;
1380         req->VolatileFileId = volatile_fid;
1381
1382         iov[0].iov_base = (char *)req;
1383         /* 4 for rfc1002 length field */
1384         iov[0].iov_len = get_rfc1002_length(req) + 4;
1385
1386         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1387
1388         if ((rc != 0) && tcon)
1389                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1390
1391         free_rsp_buf(resp_buftype, iov[0].iov_base);
1392         return rc;
1393 }
1394
1395 /*
1396  * To form a chain of read requests, any read requests after the first should
1397  * have the end_of_chain boolean set to true.
1398  */
1399 static int
1400 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1401                   unsigned int remaining_bytes, int request_type)
1402 {
1403         int rc = -EACCES;
1404         struct smb2_read_req *req = NULL;
1405
1406         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1407         if (rc)
1408                 return rc;
1409         if (io_parms->tcon->ses->server == NULL)
1410                 return -ECONNABORTED;
1411
1412         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1413
1414         req->PersistentFileId = io_parms->persistent_fid;
1415         req->VolatileFileId = io_parms->volatile_fid;
1416         req->ReadChannelInfoOffset = 0; /* reserved */
1417         req->ReadChannelInfoLength = 0; /* reserved */
1418         req->Channel = 0; /* reserved */
1419         req->MinimumCount = 0;
1420         req->Length = cpu_to_le32(io_parms->length);
1421         req->Offset = cpu_to_le64(io_parms->offset);
1422
1423         if (request_type & CHAINED_REQUEST) {
1424                 if (!(request_type & END_OF_CHAIN)) {
1425                         /* 4 for rfc1002 length field */
1426                         req->hdr.NextCommand =
1427                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1428                 } else /* END_OF_CHAIN */
1429                         req->hdr.NextCommand = 0;
1430                 if (request_type & RELATED_REQUEST) {
1431                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1432                         /*
1433                          * Related requests use info from previous read request
1434                          * in chain.
1435                          */
1436                         req->hdr.SessionId = 0xFFFFFFFF;
1437                         req->hdr.TreeId = 0xFFFFFFFF;
1438                         req->PersistentFileId = 0xFFFFFFFF;
1439                         req->VolatileFileId = 0xFFFFFFFF;
1440                 }
1441         }
1442         if (remaining_bytes > io_parms->length)
1443                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1444         else
1445                 req->RemainingBytes = 0;
1446
1447         iov[0].iov_base = (char *)req;
1448         /* 4 for rfc1002 length field */
1449         iov[0].iov_len = get_rfc1002_length(req) + 4;
1450         return rc;
1451 }
1452
1453 static void
1454 smb2_readv_callback(struct mid_q_entry *mid)
1455 {
1456         struct cifs_readdata *rdata = mid->callback_data;
1457         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1458         struct TCP_Server_Info *server = tcon->ses->server;
1459         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1460         unsigned int credits_received = 1;
1461         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1462                                  .rq_nvec = 1,
1463                                  .rq_pages = rdata->pages,
1464                                  .rq_npages = rdata->nr_pages,
1465                                  .rq_pagesz = rdata->pagesz,
1466                                  .rq_tailsz = rdata->tailsz };
1467
1468         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1469                  __func__, mid->mid, mid->mid_state, rdata->result,
1470                  rdata->bytes);
1471
1472         switch (mid->mid_state) {
1473         case MID_RESPONSE_RECEIVED:
1474                 credits_received = le16_to_cpu(buf->CreditRequest);
1475                 /* result already set, check signature */
1476                 if (server->sign) {
1477                         int rc;
1478
1479                         rc = smb2_verify_signature(&rqst, server);
1480                         if (rc)
1481                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1482                                          rc);
1483                 }
1484                 /* FIXME: should this be counted toward the initiating task? */
1485                 task_io_account_read(rdata->bytes);
1486                 cifs_stats_bytes_read(tcon, rdata->bytes);
1487                 break;
1488         case MID_REQUEST_SUBMITTED:
1489         case MID_RETRY_NEEDED:
1490                 rdata->result = -EAGAIN;
1491                 break;
1492         default:
1493                 if (rdata->result != -ENODATA)
1494                         rdata->result = -EIO;
1495         }
1496
1497         if (rdata->result)
1498                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1499
1500         queue_work(cifsiod_wq, &rdata->work);
1501         DeleteMidQEntry(mid);
1502         add_credits(server, credits_received, 0);
1503 }
1504
1505 /* smb2_async_readv - send an async write, and set up mid to handle result */
1506 int
1507 smb2_async_readv(struct cifs_readdata *rdata)
1508 {
1509         int rc;
1510         struct smb2_hdr *buf;
1511         struct cifs_io_parms io_parms;
1512         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1513                                  .rq_nvec = 1 };
1514
1515         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1516                  __func__, rdata->offset, rdata->bytes);
1517
1518         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1519         io_parms.offset = rdata->offset;
1520         io_parms.length = rdata->bytes;
1521         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1522         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1523         io_parms.pid = rdata->pid;
1524         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1525         if (rc)
1526                 return rc;
1527
1528         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1529         /* 4 for rfc1002 length field */
1530         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1531
1532         kref_get(&rdata->refcount);
1533         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1534                              cifs_readv_receive, smb2_readv_callback,
1535                              rdata, 0);
1536         if (rc) {
1537                 kref_put(&rdata->refcount, cifs_readdata_release);
1538                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1539         }
1540
1541         cifs_small_buf_release(buf);
1542         return rc;
1543 }
1544
1545 int
1546 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1547           unsigned int *nbytes, char **buf, int *buf_type)
1548 {
1549         int resp_buftype, rc = -EACCES;
1550         struct smb2_read_rsp *rsp = NULL;
1551         struct kvec iov[1];
1552
1553         *nbytes = 0;
1554         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1555         if (rc)
1556                 return rc;
1557
1558         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1559                           &resp_buftype, CIFS_LOG_ERROR);
1560
1561         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1562
1563         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1564                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1565                 return 0;
1566         }
1567
1568         if (rc) {
1569                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1570                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1571         } else {
1572                 *nbytes = le32_to_cpu(rsp->DataLength);
1573                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1574                     (*nbytes > io_parms->length)) {
1575                         cifs_dbg(FYI, "bad length %d for count %d\n",
1576                                  *nbytes, io_parms->length);
1577                         rc = -EIO;
1578                         *nbytes = 0;
1579                 }
1580         }
1581
1582         if (*buf) {
1583                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1584                        *nbytes);
1585                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1586         } else if (resp_buftype != CIFS_NO_BUFFER) {
1587                 *buf = iov[0].iov_base;
1588                 if (resp_buftype == CIFS_SMALL_BUFFER)
1589                         *buf_type = CIFS_SMALL_BUFFER;
1590                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1591                         *buf_type = CIFS_LARGE_BUFFER;
1592         }
1593         return rc;
1594 }
1595
1596 /*
1597  * Check the mid_state and signature on received buffer (if any), and queue the
1598  * workqueue completion task.
1599  */
1600 static void
1601 smb2_writev_callback(struct mid_q_entry *mid)
1602 {
1603         struct cifs_writedata *wdata = mid->callback_data;
1604         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1605         unsigned int written;
1606         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1607         unsigned int credits_received = 1;
1608
1609         switch (mid->mid_state) {
1610         case MID_RESPONSE_RECEIVED:
1611                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1612                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1613                 if (wdata->result != 0)
1614                         break;
1615
1616                 written = le32_to_cpu(rsp->DataLength);
1617                 /*
1618                  * Mask off high 16 bits when bytes written as returned
1619                  * by the server is greater than bytes requested by the
1620                  * client. OS/2 servers are known to set incorrect
1621                  * CountHigh values.
1622                  */
1623                 if (written > wdata->bytes)
1624                         written &= 0xFFFF;
1625
1626                 if (written < wdata->bytes)
1627                         wdata->result = -ENOSPC;
1628                 else
1629                         wdata->bytes = written;
1630                 break;
1631         case MID_REQUEST_SUBMITTED:
1632         case MID_RETRY_NEEDED:
1633                 wdata->result = -EAGAIN;
1634                 break;
1635         default:
1636                 wdata->result = -EIO;
1637                 break;
1638         }
1639
1640         if (wdata->result)
1641                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1642
1643         queue_work(cifsiod_wq, &wdata->work);
1644         DeleteMidQEntry(mid);
1645         add_credits(tcon->ses->server, credits_received, 0);
1646 }
1647
1648 /* smb2_async_writev - send an async write, and set up mid to handle result */
1649 int
1650 smb2_async_writev(struct cifs_writedata *wdata)
1651 {
1652         int rc = -EACCES;
1653         struct smb2_write_req *req = NULL;
1654         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1655         struct kvec iov;
1656         struct smb_rqst rqst;
1657
1658         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1659         if (rc)
1660                 goto async_writev_out;
1661
1662         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1663
1664         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1665         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1666         req->WriteChannelInfoOffset = 0;
1667         req->WriteChannelInfoLength = 0;
1668         req->Channel = 0;
1669         req->Offset = cpu_to_le64(wdata->offset);
1670         /* 4 for rfc1002 length field */
1671         req->DataOffset = cpu_to_le16(
1672                                 offsetof(struct smb2_write_req, Buffer) - 4);
1673         req->RemainingBytes = 0;
1674
1675         /* 4 for rfc1002 length field and 1 for Buffer */
1676         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1677         iov.iov_base = req;
1678
1679         rqst.rq_iov = &iov;
1680         rqst.rq_nvec = 1;
1681         rqst.rq_pages = wdata->pages;
1682         rqst.rq_npages = wdata->nr_pages;
1683         rqst.rq_pagesz = wdata->pagesz;
1684         rqst.rq_tailsz = wdata->tailsz;
1685
1686         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1687                  wdata->offset, wdata->bytes);
1688
1689         req->Length = cpu_to_le32(wdata->bytes);
1690
1691         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1692
1693         kref_get(&wdata->refcount);
1694         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1695                                 smb2_writev_callback, wdata, 0);
1696
1697         if (rc) {
1698                 kref_put(&wdata->refcount, cifs_writedata_release);
1699                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1700         }
1701
1702 async_writev_out:
1703         cifs_small_buf_release(req);
1704         return rc;
1705 }
1706
1707 /*
1708  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1709  * The length field from io_parms must be at least 1 and indicates a number of
1710  * elements with data to write that begins with position 1 in iov array. All
1711  * data length is specified by count.
1712  */
1713 int
1714 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1715            unsigned int *nbytes, struct kvec *iov, int n_vec)
1716 {
1717         int rc = 0;
1718         struct smb2_write_req *req = NULL;
1719         struct smb2_write_rsp *rsp = NULL;
1720         int resp_buftype;
1721         *nbytes = 0;
1722
1723         if (n_vec < 1)
1724                 return rc;
1725
1726         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1727         if (rc)
1728                 return rc;
1729
1730         if (io_parms->tcon->ses->server == NULL)
1731                 return -ECONNABORTED;
1732
1733         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1734
1735         req->PersistentFileId = io_parms->persistent_fid;
1736         req->VolatileFileId = io_parms->volatile_fid;
1737         req->WriteChannelInfoOffset = 0;
1738         req->WriteChannelInfoLength = 0;
1739         req->Channel = 0;
1740         req->Length = cpu_to_le32(io_parms->length);
1741         req->Offset = cpu_to_le64(io_parms->offset);
1742         /* 4 for rfc1002 length field */
1743         req->DataOffset = cpu_to_le16(
1744                                 offsetof(struct smb2_write_req, Buffer) - 4);
1745         req->RemainingBytes = 0;
1746
1747         iov[0].iov_base = (char *)req;
1748         /* 4 for rfc1002 length field and 1 for Buffer */
1749         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1750
1751         /* length of entire message including data to be written */
1752         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1753
1754         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1755                           &resp_buftype, 0);
1756         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1757
1758         if (rc) {
1759                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1760                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1761         } else
1762                 *nbytes = le32_to_cpu(rsp->DataLength);
1763
1764         free_rsp_buf(resp_buftype, rsp);
1765         return rc;
1766 }
1767
1768 static unsigned int
1769 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1770 {
1771         int len;
1772         unsigned int entrycount = 0;
1773         unsigned int next_offset = 0;
1774         FILE_DIRECTORY_INFO *entryptr;
1775
1776         if (bufstart == NULL)
1777                 return 0;
1778
1779         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1780
1781         while (1) {
1782                 entryptr = (FILE_DIRECTORY_INFO *)
1783                                         ((char *)entryptr + next_offset);
1784
1785                 if ((char *)entryptr + size > end_of_buf) {
1786                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1787                         break;
1788                 }
1789
1790                 len = le32_to_cpu(entryptr->FileNameLength);
1791                 if ((char *)entryptr + len + size > end_of_buf) {
1792                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1793                                  end_of_buf);
1794                         break;
1795                 }
1796
1797                 *lastentry = (char *)entryptr;
1798                 entrycount++;
1799
1800                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1801                 if (!next_offset)
1802                         break;
1803         }
1804
1805         return entrycount;
1806 }
1807
1808 /*
1809  * Readdir/FindFirst
1810  */
1811 int
1812 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1813                      u64 persistent_fid, u64 volatile_fid, int index,
1814                      struct cifs_search_info *srch_inf)
1815 {
1816         struct smb2_query_directory_req *req;
1817         struct smb2_query_directory_rsp *rsp = NULL;
1818         struct kvec iov[2];
1819         int rc = 0;
1820         int len;
1821         int resp_buftype;
1822         unsigned char *bufptr;
1823         struct TCP_Server_Info *server;
1824         struct cifs_ses *ses = tcon->ses;
1825         __le16 asteriks = cpu_to_le16('*');
1826         char *end_of_smb;
1827         unsigned int output_size = CIFSMaxBufSize;
1828         size_t info_buf_size;
1829
1830         if (ses && (ses->server))
1831                 server = ses->server;
1832         else
1833                 return -EIO;
1834
1835         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1836         if (rc)
1837                 return rc;
1838
1839         switch (srch_inf->info_level) {
1840         case SMB_FIND_FILE_DIRECTORY_INFO:
1841                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1842                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1843                 break;
1844         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1845                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1846                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1847                 break;
1848         default:
1849                 cifs_dbg(VFS, "info level %u isn't supported\n",
1850                          srch_inf->info_level);
1851                 rc = -EINVAL;
1852                 goto qdir_exit;
1853         }
1854
1855         req->FileIndex = cpu_to_le32(index);
1856         req->PersistentFileId = persistent_fid;
1857         req->VolatileFileId = volatile_fid;
1858
1859         len = 0x2;
1860         bufptr = req->Buffer;
1861         memcpy(bufptr, &asteriks, len);
1862
1863         req->FileNameOffset =
1864                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1865         req->FileNameLength = cpu_to_le16(len);
1866         /*
1867          * BB could be 30 bytes or so longer if we used SMB2 specific
1868          * buffer lengths, but this is safe and close enough.
1869          */
1870         output_size = min_t(unsigned int, output_size, server->maxBuf);
1871         output_size = min_t(unsigned int, output_size, 2 << 15);
1872         req->OutputBufferLength = cpu_to_le32(output_size);
1873
1874         iov[0].iov_base = (char *)req;
1875         /* 4 for RFC1001 length and 1 for Buffer */
1876         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1877
1878         iov[1].iov_base = (char *)(req->Buffer);
1879         iov[1].iov_len = len;
1880
1881         inc_rfc1001_len(req, len - 1 /* Buffer */);
1882
1883         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1884         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1885
1886         if (rc) {
1887                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1888                 goto qdir_exit;
1889         }
1890
1891         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1892                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1893                           info_buf_size);
1894         if (rc)
1895                 goto qdir_exit;
1896
1897         srch_inf->unicode = true;
1898
1899         if (srch_inf->ntwrk_buf_start) {
1900                 if (srch_inf->smallBuf)
1901                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1902                 else
1903                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1904         }
1905         srch_inf->ntwrk_buf_start = (char *)rsp;
1906         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1907                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1908         /* 4 for rfc1002 length field */
1909         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1910         srch_inf->entries_in_buffer =
1911                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1912                                     &srch_inf->last_entry, info_buf_size);
1913         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1914         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1915                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1916                  srch_inf->srch_entries_start, srch_inf->last_entry);
1917         if (resp_buftype == CIFS_LARGE_BUFFER)
1918                 srch_inf->smallBuf = false;
1919         else if (resp_buftype == CIFS_SMALL_BUFFER)
1920                 srch_inf->smallBuf = true;
1921         else
1922                 cifs_dbg(VFS, "illegal search buffer type\n");
1923
1924         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1925                 srch_inf->endOfSearch = 1;
1926         else
1927                 srch_inf->endOfSearch = 0;
1928
1929         return rc;
1930
1931 qdir_exit:
1932         free_rsp_buf(resp_buftype, rsp);
1933         return rc;
1934 }
1935
1936 static int
1937 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1938                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1939                unsigned int num, void **data, unsigned int *size)
1940 {
1941         struct smb2_set_info_req *req;
1942         struct smb2_set_info_rsp *rsp = NULL;
1943         struct kvec *iov;
1944         int rc = 0;
1945         int resp_buftype;
1946         unsigned int i;
1947         struct TCP_Server_Info *server;
1948         struct cifs_ses *ses = tcon->ses;
1949
1950         if (ses && (ses->server))
1951                 server = ses->server;
1952         else
1953                 return -EIO;
1954
1955         if (!num)
1956                 return -EINVAL;
1957
1958         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1959         if (!iov)
1960                 return -ENOMEM;
1961
1962         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1963         if (rc) {
1964                 kfree(iov);
1965                 return rc;
1966         }
1967
1968         req->hdr.ProcessId = cpu_to_le32(pid);
1969
1970         req->InfoType = SMB2_O_INFO_FILE;
1971         req->FileInfoClass = info_class;
1972         req->PersistentFileId = persistent_fid;
1973         req->VolatileFileId = volatile_fid;
1974
1975         /* 4 for RFC1001 length and 1 for Buffer */
1976         req->BufferOffset =
1977                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1978         req->BufferLength = cpu_to_le32(*size);
1979
1980         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1981
1982         memcpy(req->Buffer, *data, *size);
1983
1984         iov[0].iov_base = (char *)req;
1985         /* 4 for RFC1001 length */
1986         iov[0].iov_len = get_rfc1002_length(req) + 4;
1987
1988         for (i = 1; i < num; i++) {
1989                 inc_rfc1001_len(req, size[i]);
1990                 le32_add_cpu(&req->BufferLength, size[i]);
1991                 iov[i].iov_base = (char *)data[i];
1992                 iov[i].iov_len = size[i];
1993         }
1994
1995         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1996         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1997
1998         if (rc != 0) {
1999                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2000                 goto out;
2001         }
2002 out:
2003         free_rsp_buf(resp_buftype, rsp);
2004         kfree(iov);
2005         return rc;
2006 }
2007
2008 int
2009 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2010             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2011 {
2012         struct smb2_file_rename_info info;
2013         void **data;
2014         unsigned int size[2];
2015         int rc;
2016         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2017
2018         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2019         if (!data)
2020                 return -ENOMEM;
2021
2022         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2023                               /* 0 = fail if target already exists */
2024         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2025         info.FileNameLength = cpu_to_le32(len);
2026
2027         data[0] = &info;
2028         size[0] = sizeof(struct smb2_file_rename_info);
2029
2030         data[1] = target_file;
2031         size[1] = len + 2 /* null */;
2032
2033         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2034                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2035                            size);
2036         kfree(data);
2037         return rc;
2038 }
2039
2040 int
2041 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2042                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2043 {
2044         struct smb2_file_link_info info;
2045         void **data;
2046         unsigned int size[2];
2047         int rc;
2048         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2049
2050         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2051         if (!data)
2052                 return -ENOMEM;
2053
2054         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2055                               /* 0 = fail if link already exists */
2056         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2057         info.FileNameLength = cpu_to_le32(len);
2058
2059         data[0] = &info;
2060         size[0] = sizeof(struct smb2_file_link_info);
2061
2062         data[1] = target_file;
2063         size[1] = len + 2 /* null */;
2064
2065         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2066                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2067         kfree(data);
2068         return rc;
2069 }
2070
2071 int
2072 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2073              u64 volatile_fid, u32 pid, __le64 *eof)
2074 {
2075         struct smb2_file_eof_info info;
2076         void *data;
2077         unsigned int size;
2078
2079         info.EndOfFile = *eof;
2080
2081         data = &info;
2082         size = sizeof(struct smb2_file_eof_info);
2083
2084         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2085                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2086 }
2087
2088 int
2089 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2090               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2091 {
2092         unsigned int size;
2093         size = sizeof(FILE_BASIC_INFO);
2094         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2095                              current->tgid, FILE_BASIC_INFORMATION, 1,
2096                              (void **)&buf, &size);
2097 }
2098
2099 int
2100 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2101                   const u64 persistent_fid, const u64 volatile_fid,
2102                   __u8 oplock_level)
2103 {
2104         int rc;
2105         struct smb2_oplock_break *req = NULL;
2106
2107         cifs_dbg(FYI, "SMB2_oplock_break\n");
2108         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2109
2110         if (rc)
2111                 return rc;
2112
2113         req->VolatileFid = volatile_fid;
2114         req->PersistentFid = persistent_fid;
2115         req->OplockLevel = oplock_level;
2116         req->hdr.CreditRequest = cpu_to_le16(1);
2117
2118         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2119         /* SMB2 buffer freed by function above */
2120
2121         if (rc) {
2122                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2123                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2124         }
2125
2126         return rc;
2127 }
2128
2129 static void
2130 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2131                         struct kstatfs *kst)
2132 {
2133         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2134                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2135         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2136         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2137         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2138         return;
2139 }
2140
2141 static int
2142 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2143                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2144 {
2145         int rc;
2146         struct smb2_query_info_req *req;
2147
2148         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2149
2150         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2151                 return -EIO;
2152
2153         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2154         if (rc)
2155                 return rc;
2156
2157         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2158         req->FileInfoClass = level;
2159         req->PersistentFileId = persistent_fid;
2160         req->VolatileFileId = volatile_fid;
2161         /* 4 for rfc1002 length field and 1 for pad */
2162         req->InputBufferOffset =
2163                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2164         req->OutputBufferLength = cpu_to_le32(
2165                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2166
2167         iov->iov_base = (char *)req;
2168         /* 4 for rfc1002 length field */
2169         iov->iov_len = get_rfc1002_length(req) + 4;
2170         return 0;
2171 }
2172
2173 int
2174 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2175               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2176 {
2177         struct smb2_query_info_rsp *rsp = NULL;
2178         struct kvec iov;
2179         int rc = 0;
2180         int resp_buftype;
2181         struct cifs_ses *ses = tcon->ses;
2182         struct smb2_fs_full_size_info *info = NULL;
2183
2184         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2185                                 sizeof(struct smb2_fs_full_size_info),
2186                                 persistent_fid, volatile_fid);
2187         if (rc)
2188                 return rc;
2189
2190         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2191         if (rc) {
2192                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2193                 goto qinf_exit;
2194         }
2195         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2196
2197         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2198                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2199         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2200                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2201                           sizeof(struct smb2_fs_full_size_info));
2202         if (!rc)
2203                 copy_fs_info_to_kstatfs(info, fsdata);
2204
2205 qinf_exit:
2206         free_rsp_buf(resp_buftype, iov.iov_base);
2207         return rc;
2208 }
2209
2210 int
2211 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2212            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2213            const __u32 num_lock, struct smb2_lock_element *buf)
2214 {
2215         int rc = 0;
2216         struct smb2_lock_req *req = NULL;
2217         struct kvec iov[2];
2218         int resp_buf_type;
2219         unsigned int count;
2220
2221         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2222
2223         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2224         if (rc)
2225                 return rc;
2226
2227         req->hdr.ProcessId = cpu_to_le32(pid);
2228         req->LockCount = cpu_to_le16(num_lock);
2229
2230         req->PersistentFileId = persist_fid;
2231         req->VolatileFileId = volatile_fid;
2232
2233         count = num_lock * sizeof(struct smb2_lock_element);
2234         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2235
2236         iov[0].iov_base = (char *)req;
2237         /* 4 for rfc1002 length field and count for all locks */
2238         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2239         iov[1].iov_base = (char *)buf;
2240         iov[1].iov_len = count;
2241
2242         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2243         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2244         if (rc) {
2245                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2246                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2247         }
2248
2249         return rc;
2250 }
2251
2252 int
2253 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2254           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2255           const __u64 length, const __u64 offset, const __u32 lock_flags,
2256           const bool wait)
2257 {
2258         struct smb2_lock_element lock;
2259
2260         lock.Offset = cpu_to_le64(offset);
2261         lock.Length = cpu_to_le64(length);
2262         lock.Flags = cpu_to_le32(lock_flags);
2263         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2264                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2265
2266         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2267 }
2268
2269 int
2270 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2271                  __u8 *lease_key, const __le32 lease_state)
2272 {
2273         int rc;
2274         struct smb2_lease_ack *req = NULL;
2275
2276         cifs_dbg(FYI, "SMB2_lease_break\n");
2277         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2278
2279         if (rc)
2280                 return rc;
2281
2282         req->hdr.CreditRequest = cpu_to_le16(1);
2283         req->StructureSize = cpu_to_le16(36);
2284         inc_rfc1001_len(req, 12);
2285
2286         memcpy(req->LeaseKey, lease_key, 16);
2287         req->LeaseState = lease_state;
2288
2289         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2290         /* SMB2 buffer freed by function above */
2291
2292         if (rc) {
2293                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2294                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2295         }
2296
2297         return rc;
2298 }