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         unsigned int next = 0;
 857         char *name;
 858
 859         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 860         lc = (struct create_lease *)data_offset;
 861         do {
 862                 lc = (struct create_lease *)((char *)lc + next);
 863                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 864                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 865                     strncmp(name, "RqLs", 4)) {
 866                         next = le32_to_cpu(lc->ccontext.Next);
 867                         continue;
 868                 }
 869                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 870                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 871                 found = true;
 872                 break;
 873         } while (next != 0);
 874
 875         if (!found)
 876                 return 0;
 877
 878         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 879 }
 880
 881 int
 882 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 883           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 884           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 885           __u8 *oplock, struct smb2_file_all_info *buf)
 886 {
 887         struct smb2_create_req *req;
 888         struct smb2_create_rsp *rsp;
 889         struct TCP_Server_Info *server;
 890         struct cifs_ses *ses = tcon->ses;
 891         struct kvec iov[3];
 892         int resp_buftype;
 893         int uni_path_len;
 894         __le16 *copy_path = NULL;
 895         int copy_size;
 896         int rc = 0;
 897         int num_iovecs = 2;
 898
 899         cifs_dbg(FYI, "create/open\n");
 900
 901         if (ses && (ses->server))
 902                 server = ses->server;
 903         else
 904                 return -EIO;
 905
 906         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 907         if (rc)
 908                 return rc;
 909
 910         req->ImpersonationLevel = IL_IMPERSONATION;
 911         req->DesiredAccess = cpu_to_le32(desired_access);
 912         /* File attributes ignored on open (used in create though) */
 913         req->FileAttributes = cpu_to_le32(file_attributes);
 914         req->ShareAccess = FILE_SHARE_ALL_LE;
 915         req->CreateDisposition = cpu_to_le32(create_disposition);
 916         req->CreateOptions = cpu_to_le32(create_options);
 917         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 918         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 919                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 920
 921         iov[0].iov_base = (char *)req;
 922         /* 4 for rfc1002 length field */
 923         iov[0].iov_len = get_rfc1002_length(req) + 4;
 924
 925         /* MUST set path len (NameLength) to 0 opening root of share */
 926         if (uni_path_len >= 4) {
 927                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 928                 /* -1 since last byte is buf[0] which is sent below (path) */
 929                 iov[0].iov_len--;
 930                 if (uni_path_len % 8 != 0) {
 931                         copy_size = uni_path_len / 8 * 8;
 932                         if (copy_size < uni_path_len)
 933                                 copy_size += 8;
 934
 935                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 936                         if (!copy_path)
 937                                 return -ENOMEM;
 938                         memcpy((char *)copy_path, (const char *)path,
 939                                 uni_path_len);
 940                         uni_path_len = copy_size;
 941                         path = copy_path;
 942                 }
 943
 944                 iov[1].iov_len = uni_path_len;
 945                 iov[1].iov_base = path;
 946                 /*
 947                  * -1 since last byte is buf[0] which was counted in
 948                  * smb2_buf_len.
 949                  */
 950                 inc_rfc1001_len(req, uni_path_len - 1);
 951         } else {
 952                 iov[0].iov_len += 7;
 953                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 954                                 req->hdr.smb2_buf_length) + 8 - 1);
 955                 num_iovecs = 1;
 956                 req->NameLength = 0;
 957         }
 958
 959         if (!server->oplocks)
 960                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 961
 962         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 963             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 964                 req->RequestedOplockLevel = *oplock;
 965         else {
 966                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 967                 if (iov[num_iovecs].iov_base == NULL) {
 968                         cifs_small_buf_release(req);
 969                         kfree(copy_path);
 970                         return -ENOMEM;
 971                 }
 972                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
 973                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 974                 req->CreateContextsOffset = cpu_to_le32(
 975                         sizeof(struct smb2_create_req) - 4 - 8 +
 976                         iov[num_iovecs-1].iov_len);
 977                 req->CreateContextsLength = cpu_to_le32(
 978                         sizeof(struct create_lease));
 979                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 980                 num_iovecs++;
 981         }
 982
 983         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 984         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 985
 986         if (rc != 0) {
 987                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 988                 goto creat_exit;
 989         }
 990
 991         *persistent_fid = rsp->PersistentFileId;
 992         *volatile_fid = rsp->VolatileFileId;
 993
 994         if (buf) {
 995                 memcpy(buf, &rsp->CreationTime, 32);
 996                 buf->AllocationSize = rsp->AllocationSize;
 997                 buf->EndOfFile = rsp->EndofFile;
 998                 buf->Attributes = rsp->FileAttributes;
 999                 buf->NumberOfLinks = cpu_to_le32(1);
1000                 buf->DeletePending = 0;
1001         }
1002
1003         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1004                 *oplock = parse_lease_state(rsp);
1005         else
1006                 *oplock = rsp->OplockLevel;
1007 creat_exit:
1008         kfree(copy_path);
1009         free_rsp_buf(resp_buftype, rsp);
1010         return rc;
1011 }
1012
1013 /*
1014  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1015  */
1016 int
1017 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1018            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1019            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1020 {
1021         struct smb2_ioctl_req *req;
1022         struct smb2_ioctl_rsp *rsp;
1023         struct TCP_Server_Info *server;
1024         struct cifs_ses *ses = tcon->ses;
1025         struct kvec iov[2];
1026         int resp_buftype;
1027         int num_iovecs;
1028         int rc = 0;
1029
1030         cifs_dbg(FYI, "SMB2 IOCTL\n");
1031
1032         /* zero out returned data len, in case of error */
1033         if (plen)
1034                 *plen = 0;
1035
1036         if (ses && (ses->server))
1037                 server = ses->server;
1038         else
1039                 return -EIO;
1040
1041         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1042         if (rc)
1043                 return rc;
1044
1045         req->CtlCode = cpu_to_le32(opcode);
1046         req->PersistentFileId = persistent_fid;
1047         req->VolatileFileId = volatile_fid;
1048
1049         if (indatalen) {
1050                 req->InputCount = cpu_to_le32(indatalen);
1051                 /* do not set InputOffset if no input data */
1052                 req->InputOffset =
1053                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1054                 iov[1].iov_base = in_data;
1055                 iov[1].iov_len = indatalen;
1056                 num_iovecs = 2;
1057         } else
1058                 num_iovecs = 1;
1059
1060         req->OutputOffset = 0;
1061         req->OutputCount = 0; /* MBZ */
1062
1063         /*
1064          * Could increase MaxOutputResponse, but that would require more
1065          * than one credit. Windows typically sets this smaller, but for some
1066          * ioctls it may be useful to allow server to send more. No point
1067          * limiting what the server can send as long as fits in one credit
1068          */
1069         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1070
1071         if (is_fsctl)
1072                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1073         else
1074                 req->Flags = 0;
1075
1076         iov[0].iov_base = (char *)req;
1077         /* 4 for rfc1002 length field */
1078         iov[0].iov_len = get_rfc1002_length(req) + 4;
1079
1080         if (indatalen)
1081                 inc_rfc1001_len(req, indatalen);
1082
1083         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1084         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1085
1086         if (rc != 0) {
1087                 if (tcon)
1088                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1089                 goto ioctl_exit;
1090         }
1091
1092         /* check if caller wants to look at return data or just return rc */
1093         if ((plen == NULL) || (out_data == NULL))
1094                 goto ioctl_exit;
1095
1096         *plen = le32_to_cpu(rsp->OutputCount);
1097
1098         /* We check for obvious errors in the output buffer length and offset */
1099         if (*plen == 0)
1100                 goto ioctl_exit; /* server returned no data */
1101         else if (*plen > 0xFF00) {
1102                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1103                 *plen = 0;
1104                 rc = -EIO;
1105                 goto ioctl_exit;
1106         }
1107
1108         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1109                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1110                         le32_to_cpu(rsp->OutputOffset));
1111                 *plen = 0;
1112                 rc = -EIO;
1113                 goto ioctl_exit;
1114         }
1115
1116         *out_data = kmalloc(*plen, GFP_KERNEL);
1117         if (*out_data == NULL) {
1118                 rc = -ENOMEM;
1119                 goto ioctl_exit;
1120         }
1121
1122         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1123                *plen);
1124 ioctl_exit:
1125         free_rsp_buf(resp_buftype, rsp);
1126         return rc;
1127 }
1128
1129 int
1130 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1131            u64 persistent_fid, u64 volatile_fid)
1132 {
1133         struct smb2_close_req *req;
1134         struct smb2_close_rsp *rsp;
1135         struct TCP_Server_Info *server;
1136         struct cifs_ses *ses = tcon->ses;
1137         struct kvec iov[1];
1138         int resp_buftype;
1139         int rc = 0;
1140
1141         cifs_dbg(FYI, "Close\n");
1142
1143         if (ses && (ses->server))
1144                 server = ses->server;
1145         else
1146                 return -EIO;
1147
1148         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1149         if (rc)
1150                 return rc;
1151
1152         req->PersistentFileId = persistent_fid;
1153         req->VolatileFileId = volatile_fid;
1154
1155         iov[0].iov_base = (char *)req;
1156         /* 4 for rfc1002 length field */
1157         iov[0].iov_len = get_rfc1002_length(req) + 4;
1158
1159         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1160         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1161
1162         if (rc != 0) {
1163                 if (tcon)
1164                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1165                 goto close_exit;
1166         }
1167
1168         /* BB FIXME - decode close response, update inode for caching */
1169
1170 close_exit:
1171         free_rsp_buf(resp_buftype, rsp);
1172         return rc;
1173 }
1174
1175 static int
1176 validate_buf(unsigned int offset, unsigned int buffer_length,
1177              struct smb2_hdr *hdr, unsigned int min_buf_size)
1178
1179 {
1180         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1181         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1182         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1183         char *end_of_buf = begin_of_buf + buffer_length;
1184
1185
1186         if (buffer_length < min_buf_size) {
1187                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1188                          buffer_length, min_buf_size);
1189                 return -EINVAL;
1190         }
1191
1192         /* check if beyond RFC1001 maximum length */
1193         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1194                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1195                          buffer_length, smb_len);
1196                 return -EINVAL;
1197         }
1198
1199         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1200                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1201                 return -EINVAL;
1202         }
1203
1204         return 0;
1205 }
1206
1207 /*
1208  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1209  * Caller must free buffer.
1210  */
1211 static int
1212 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1213                       struct smb2_hdr *hdr, unsigned int minbufsize,
1214                       char *data)
1215
1216 {
1217         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1218         int rc;
1219
1220         if (!data)
1221                 return -EINVAL;
1222
1223         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1224         if (rc)
1225                 return rc;
1226
1227         memcpy(data, begin_of_buf, buffer_length);
1228
1229         return 0;
1230 }
1231
1232 static int
1233 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1234            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1235            size_t output_len, size_t min_len, void *data)
1236 {
1237         struct smb2_query_info_req *req;
1238         struct smb2_query_info_rsp *rsp = NULL;
1239         struct kvec iov[2];
1240         int rc = 0;
1241         int resp_buftype;
1242         struct TCP_Server_Info *server;
1243         struct cifs_ses *ses = tcon->ses;
1244
1245         cifs_dbg(FYI, "Query Info\n");
1246
1247         if (ses && (ses->server))
1248                 server = ses->server;
1249         else
1250                 return -EIO;
1251
1252         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1253         if (rc)
1254                 return rc;
1255
1256         req->InfoType = SMB2_O_INFO_FILE;
1257         req->FileInfoClass = info_class;
1258         req->PersistentFileId = persistent_fid;
1259         req->VolatileFileId = volatile_fid;
1260         /* 4 for rfc1002 length field and 1 for Buffer */
1261         req->InputBufferOffset =
1262                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1263         req->OutputBufferLength = cpu_to_le32(output_len);
1264
1265         iov[0].iov_base = (char *)req;
1266         /* 4 for rfc1002 length field */
1267         iov[0].iov_len = get_rfc1002_length(req) + 4;
1268
1269         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1270         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1271
1272         if (rc) {
1273                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1274                 goto qinf_exit;
1275         }
1276
1277         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1278                                    le32_to_cpu(rsp->OutputBufferLength),
1279                                    &rsp->hdr, min_len, data);
1280
1281 qinf_exit:
1282         free_rsp_buf(resp_buftype, rsp);
1283         return rc;
1284 }
1285
1286 int
1287 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1288                 u64 persistent_fid, u64 volatile_fid,
1289                 struct smb2_file_all_info *data)
1290 {
1291         return query_info(xid, tcon, persistent_fid, volatile_fid,
1292                           FILE_ALL_INFORMATION,
1293                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1294                           sizeof(struct smb2_file_all_info), data);
1295 }
1296
1297 int
1298 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1299                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1300 {
1301         return query_info(xid, tcon, persistent_fid, volatile_fid,
1302                           FILE_INTERNAL_INFORMATION,
1303                           sizeof(struct smb2_file_internal_info),
1304                           sizeof(struct smb2_file_internal_info), uniqueid);
1305 }
1306
1307 /*
1308  * This is a no-op for now. We're not really interested in the reply, but
1309  * rather in the fact that the server sent one and that server->lstrp
1310  * gets updated.
1311  *
1312  * FIXME: maybe we should consider checking that the reply matches request?
1313  */
1314 static void
1315 smb2_echo_callback(struct mid_q_entry *mid)
1316 {
1317         struct TCP_Server_Info *server = mid->callback_data;
1318         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1319         unsigned int credits_received = 1;
1320
1321         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1322                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1323
1324         DeleteMidQEntry(mid);
1325         add_credits(server, credits_received, CIFS_ECHO_OP);
1326 }
1327
1328 int
1329 SMB2_echo(struct TCP_Server_Info *server)
1330 {
1331         struct smb2_echo_req *req;
1332         int rc = 0;
1333         struct kvec iov;
1334         struct smb_rqst rqst = { .rq_iov = &iov,
1335                                  .rq_nvec = 1 };
1336
1337         cifs_dbg(FYI, "In echo request\n");
1338
1339         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1340         if (rc)
1341                 return rc;
1342
1343         req->hdr.CreditRequest = cpu_to_le16(1);
1344
1345         iov.iov_base = (char *)req;
1346         /* 4 for rfc1002 length field */
1347         iov.iov_len = get_rfc1002_length(req) + 4;
1348
1349         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1350                              CIFS_ECHO_OP);
1351         if (rc)
1352                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1353
1354         cifs_small_buf_release(req);
1355         return rc;
1356 }
1357
1358 int
1359 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1360            u64 volatile_fid)
1361 {
1362         struct smb2_flush_req *req;
1363         struct TCP_Server_Info *server;
1364         struct cifs_ses *ses = tcon->ses;
1365         struct kvec iov[1];
1366         int resp_buftype;
1367         int rc = 0;
1368
1369         cifs_dbg(FYI, "Flush\n");
1370
1371         if (ses && (ses->server))
1372                 server = ses->server;
1373         else
1374                 return -EIO;
1375
1376         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1377         if (rc)
1378                 return rc;
1379
1380         req->PersistentFileId = persistent_fid;
1381         req->VolatileFileId = volatile_fid;
1382
1383         iov[0].iov_base = (char *)req;
1384         /* 4 for rfc1002 length field */
1385         iov[0].iov_len = get_rfc1002_length(req) + 4;
1386
1387         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1388
1389         if ((rc != 0) && tcon)
1390                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1391
1392         free_rsp_buf(resp_buftype, iov[0].iov_base);
1393         return rc;
1394 }
1395
1396 /*
1397  * To form a chain of read requests, any read requests after the first should
1398  * have the end_of_chain boolean set to true.
1399  */
1400 static int
1401 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1402                   unsigned int remaining_bytes, int request_type)
1403 {
1404         int rc = -EACCES;
1405         struct smb2_read_req *req = NULL;
1406
1407         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1408         if (rc)
1409                 return rc;
1410         if (io_parms->tcon->ses->server == NULL)
1411                 return -ECONNABORTED;
1412
1413         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1414
1415         req->PersistentFileId = io_parms->persistent_fid;
1416         req->VolatileFileId = io_parms->volatile_fid;
1417         req->ReadChannelInfoOffset = 0; /* reserved */
1418         req->ReadChannelInfoLength = 0; /* reserved */
1419         req->Channel = 0; /* reserved */
1420         req->MinimumCount = 0;
1421         req->Length = cpu_to_le32(io_parms->length);
1422         req->Offset = cpu_to_le64(io_parms->offset);
1423
1424         if (request_type & CHAINED_REQUEST) {
1425                 if (!(request_type & END_OF_CHAIN)) {
1426                         /* 4 for rfc1002 length field */
1427                         req->hdr.NextCommand =
1428                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1429                 } else /* END_OF_CHAIN */
1430                         req->hdr.NextCommand = 0;
1431                 if (request_type & RELATED_REQUEST) {
1432                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1433                         /*
1434                          * Related requests use info from previous read request
1435                          * in chain.
1436                          */
1437                         req->hdr.SessionId = 0xFFFFFFFF;
1438                         req->hdr.TreeId = 0xFFFFFFFF;
1439                         req->PersistentFileId = 0xFFFFFFFF;
1440                         req->VolatileFileId = 0xFFFFFFFF;
1441                 }
1442         }
1443         if (remaining_bytes > io_parms->length)
1444                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1445         else
1446                 req->RemainingBytes = 0;
1447
1448         iov[0].iov_base = (char *)req;
1449         /* 4 for rfc1002 length field */
1450         iov[0].iov_len = get_rfc1002_length(req) + 4;
1451         return rc;
1452 }
1453
1454 static void
1455 smb2_readv_callback(struct mid_q_entry *mid)
1456 {
1457         struct cifs_readdata *rdata = mid->callback_data;
1458         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1459         struct TCP_Server_Info *server = tcon->ses->server;
1460         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1461         unsigned int credits_received = 1;
1462         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1463                                  .rq_nvec = 1,
1464                                  .rq_pages = rdata->pages,
1465                                  .rq_npages = rdata->nr_pages,
1466                                  .rq_pagesz = rdata->pagesz,
1467                                  .rq_tailsz = rdata->tailsz };
1468
1469         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1470                  __func__, mid->mid, mid->mid_state, rdata->result,
1471                  rdata->bytes);
1472
1473         switch (mid->mid_state) {
1474         case MID_RESPONSE_RECEIVED:
1475                 credits_received = le16_to_cpu(buf->CreditRequest);
1476                 /* result already set, check signature */
1477                 if (server->sign) {
1478                         int rc;
1479
1480                         rc = smb2_verify_signature(&rqst, server);
1481                         if (rc)
1482                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1483                                          rc);
1484                 }
1485                 /* FIXME: should this be counted toward the initiating task? */
1486                 task_io_account_read(rdata->bytes);
1487                 cifs_stats_bytes_read(tcon, rdata->bytes);
1488                 break;
1489         case MID_REQUEST_SUBMITTED:
1490         case MID_RETRY_NEEDED:
1491                 rdata->result = -EAGAIN;
1492                 break;
1493         default:
1494                 if (rdata->result != -ENODATA)
1495                         rdata->result = -EIO;
1496         }
1497
1498         if (rdata->result)
1499                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1500
1501         queue_work(cifsiod_wq, &rdata->work);
1502         DeleteMidQEntry(mid);
1503         add_credits(server, credits_received, 0);
1504 }
1505
1506 /* smb2_async_readv - send an async write, and set up mid to handle result */
1507 int
1508 smb2_async_readv(struct cifs_readdata *rdata)
1509 {
1510         int rc;
1511         struct smb2_hdr *buf;
1512         struct cifs_io_parms io_parms;
1513         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1514                                  .rq_nvec = 1 };
1515
1516         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1517                  __func__, rdata->offset, rdata->bytes);
1518
1519         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1520         io_parms.offset = rdata->offset;
1521         io_parms.length = rdata->bytes;
1522         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1523         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1524         io_parms.pid = rdata->pid;
1525         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1526         if (rc)
1527                 return rc;
1528
1529         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1530         /* 4 for rfc1002 length field */
1531         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1532
1533         kref_get(&rdata->refcount);
1534         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1535                              cifs_readv_receive, smb2_readv_callback,
1536                              rdata, 0);
1537         if (rc) {
1538                 kref_put(&rdata->refcount, cifs_readdata_release);
1539                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1540         }
1541
1542         cifs_small_buf_release(buf);
1543         return rc;
1544 }
1545
1546 int
1547 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1548           unsigned int *nbytes, char **buf, int *buf_type)
1549 {
1550         int resp_buftype, rc = -EACCES;
1551         struct smb2_read_rsp *rsp = NULL;
1552         struct kvec iov[1];
1553
1554         *nbytes = 0;
1555         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1556         if (rc)
1557                 return rc;
1558
1559         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1560                           &resp_buftype, CIFS_LOG_ERROR);
1561
1562         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1563
1564         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1565                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1566                 return 0;
1567         }
1568
1569         if (rc) {
1570                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1571                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1572         } else {
1573                 *nbytes = le32_to_cpu(rsp->DataLength);
1574                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1575                     (*nbytes > io_parms->length)) {
1576                         cifs_dbg(FYI, "bad length %d for count %d\n",
1577                                  *nbytes, io_parms->length);
1578                         rc = -EIO;
1579                         *nbytes = 0;
1580                 }
1581         }
1582
1583         if (*buf) {
1584                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1585                        *nbytes);
1586                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1587         } else if (resp_buftype != CIFS_NO_BUFFER) {
1588                 *buf = iov[0].iov_base;
1589                 if (resp_buftype == CIFS_SMALL_BUFFER)
1590                         *buf_type = CIFS_SMALL_BUFFER;
1591                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1592                         *buf_type = CIFS_LARGE_BUFFER;
1593         }
1594         return rc;
1595 }
1596
1597 /*
1598  * Check the mid_state and signature on received buffer (if any), and queue the
1599  * workqueue completion task.
1600  */
1601 static void
1602 smb2_writev_callback(struct mid_q_entry *mid)
1603 {
1604         struct cifs_writedata *wdata = mid->callback_data;
1605         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1606         unsigned int written;
1607         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1608         unsigned int credits_received = 1;
1609
1610         switch (mid->mid_state) {
1611         case MID_RESPONSE_RECEIVED:
1612                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1613                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1614                 if (wdata->result != 0)
1615                         break;
1616
1617                 written = le32_to_cpu(rsp->DataLength);
1618                 /*
1619                  * Mask off high 16 bits when bytes written as returned
1620                  * by the server is greater than bytes requested by the
1621                  * client. OS/2 servers are known to set incorrect
1622                  * CountHigh values.
1623                  */
1624                 if (written > wdata->bytes)
1625                         written &= 0xFFFF;
1626
1627                 if (written < wdata->bytes)
1628                         wdata->result = -ENOSPC;
1629                 else
1630                         wdata->bytes = written;
1631                 break;
1632         case MID_REQUEST_SUBMITTED:
1633         case MID_RETRY_NEEDED:
1634                 wdata->result = -EAGAIN;
1635                 break;
1636         default:
1637                 wdata->result = -EIO;
1638                 break;
1639         }
1640
1641         if (wdata->result)
1642                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1643
1644         queue_work(cifsiod_wq, &wdata->work);
1645         DeleteMidQEntry(mid);
1646         add_credits(tcon->ses->server, credits_received, 0);
1647 }
1648
1649 /* smb2_async_writev - send an async write, and set up mid to handle result */
1650 int
1651 smb2_async_writev(struct cifs_writedata *wdata)
1652 {
1653         int rc = -EACCES;
1654         struct smb2_write_req *req = NULL;
1655         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1656         struct kvec iov;
1657         struct smb_rqst rqst;
1658
1659         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1660         if (rc)
1661                 goto async_writev_out;
1662
1663         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1664
1665         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1666         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1667         req->WriteChannelInfoOffset = 0;
1668         req->WriteChannelInfoLength = 0;
1669         req->Channel = 0;
1670         req->Offset = cpu_to_le64(wdata->offset);
1671         /* 4 for rfc1002 length field */
1672         req->DataOffset = cpu_to_le16(
1673                                 offsetof(struct smb2_write_req, Buffer) - 4);
1674         req->RemainingBytes = 0;
1675
1676         /* 4 for rfc1002 length field and 1 for Buffer */
1677         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1678         iov.iov_base = req;
1679
1680         rqst.rq_iov = &iov;
1681         rqst.rq_nvec = 1;
1682         rqst.rq_pages = wdata->pages;
1683         rqst.rq_npages = wdata->nr_pages;
1684         rqst.rq_pagesz = wdata->pagesz;
1685         rqst.rq_tailsz = wdata->tailsz;
1686
1687         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1688                  wdata->offset, wdata->bytes);
1689
1690         req->Length = cpu_to_le32(wdata->bytes);
1691
1692         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1693
1694         kref_get(&wdata->refcount);
1695         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1696                                 smb2_writev_callback, wdata, 0);
1697
1698         if (rc) {
1699                 kref_put(&wdata->refcount, cifs_writedata_release);
1700                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1701         }
1702
1703 async_writev_out:
1704         cifs_small_buf_release(req);
1705         return rc;
1706 }
1707
1708 /*
1709  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1710  * The length field from io_parms must be at least 1 and indicates a number of
1711  * elements with data to write that begins with position 1 in iov array. All
1712  * data length is specified by count.
1713  */
1714 int
1715 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1716            unsigned int *nbytes, struct kvec *iov, int n_vec)
1717 {
1718         int rc = 0;
1719         struct smb2_write_req *req = NULL;
1720         struct smb2_write_rsp *rsp = NULL;
1721         int resp_buftype;
1722         *nbytes = 0;
1723
1724         if (n_vec < 1)
1725                 return rc;
1726
1727         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1728         if (rc)
1729                 return rc;
1730
1731         if (io_parms->tcon->ses->server == NULL)
1732                 return -ECONNABORTED;
1733
1734         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1735
1736         req->PersistentFileId = io_parms->persistent_fid;
1737         req->VolatileFileId = io_parms->volatile_fid;
1738         req->WriteChannelInfoOffset = 0;
1739         req->WriteChannelInfoLength = 0;
1740         req->Channel = 0;
1741         req->Length = cpu_to_le32(io_parms->length);
1742         req->Offset = cpu_to_le64(io_parms->offset);
1743         /* 4 for rfc1002 length field */
1744         req->DataOffset = cpu_to_le16(
1745                                 offsetof(struct smb2_write_req, Buffer) - 4);
1746         req->RemainingBytes = 0;
1747
1748         iov[0].iov_base = (char *)req;
1749         /* 4 for rfc1002 length field and 1 for Buffer */
1750         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1751
1752         /* length of entire message including data to be written */
1753         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1754
1755         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1756                           &resp_buftype, 0);
1757         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1758
1759         if (rc) {
1760                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1761                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1762         } else
1763                 *nbytes = le32_to_cpu(rsp->DataLength);
1764
1765         free_rsp_buf(resp_buftype, rsp);
1766         return rc;
1767 }
1768
1769 static unsigned int
1770 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1771 {
1772         int len;
1773         unsigned int entrycount = 0;
1774         unsigned int next_offset = 0;
1775         FILE_DIRECTORY_INFO *entryptr;
1776
1777         if (bufstart == NULL)
1778                 return 0;
1779
1780         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1781
1782         while (1) {
1783                 entryptr = (FILE_DIRECTORY_INFO *)
1784                                         ((char *)entryptr + next_offset);
1785
1786                 if ((char *)entryptr + size > end_of_buf) {
1787                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1788                         break;
1789                 }
1790
1791                 len = le32_to_cpu(entryptr->FileNameLength);
1792                 if ((char *)entryptr + len + size > end_of_buf) {
1793                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1794                                  end_of_buf);
1795                         break;
1796                 }
1797
1798                 *lastentry = (char *)entryptr;
1799                 entrycount++;
1800
1801                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1802                 if (!next_offset)
1803                         break;
1804         }
1805
1806         return entrycount;
1807 }
1808
1809 /*
1810  * Readdir/FindFirst
1811  */
1812 int
1813 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1814                      u64 persistent_fid, u64 volatile_fid, int index,
1815                      struct cifs_search_info *srch_inf)
1816 {
1817         struct smb2_query_directory_req *req;
1818         struct smb2_query_directory_rsp *rsp = NULL;
1819         struct kvec iov[2];
1820         int rc = 0;
1821         int len;
1822         int resp_buftype;
1823         unsigned char *bufptr;
1824         struct TCP_Server_Info *server;
1825         struct cifs_ses *ses = tcon->ses;
1826         __le16 asteriks = cpu_to_le16('*');
1827         char *end_of_smb;
1828         unsigned int output_size = CIFSMaxBufSize;
1829         size_t info_buf_size;
1830
1831         if (ses && (ses->server))
1832                 server = ses->server;
1833         else
1834                 return -EIO;
1835
1836         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1837         if (rc)
1838                 return rc;
1839
1840         switch (srch_inf->info_level) {
1841         case SMB_FIND_FILE_DIRECTORY_INFO:
1842                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1843                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1844                 break;
1845         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1846                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1847                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1848                 break;
1849         default:
1850                 cifs_dbg(VFS, "info level %u isn't supported\n",
1851                          srch_inf->info_level);
1852                 rc = -EINVAL;
1853                 goto qdir_exit;
1854         }
1855
1856         req->FileIndex = cpu_to_le32(index);
1857         req->PersistentFileId = persistent_fid;
1858         req->VolatileFileId = volatile_fid;
1859
1860         len = 0x2;
1861         bufptr = req->Buffer;
1862         memcpy(bufptr, &asteriks, len);
1863
1864         req->FileNameOffset =
1865                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1866         req->FileNameLength = cpu_to_le16(len);
1867         /*
1868          * BB could be 30 bytes or so longer if we used SMB2 specific
1869          * buffer lengths, but this is safe and close enough.
1870          */
1871         output_size = min_t(unsigned int, output_size, server->maxBuf);
1872         output_size = min_t(unsigned int, output_size, 2 << 15);
1873         req->OutputBufferLength = cpu_to_le32(output_size);
1874
1875         iov[0].iov_base = (char *)req;
1876         /* 4 for RFC1001 length and 1 for Buffer */
1877         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1878
1879         iov[1].iov_base = (char *)(req->Buffer);
1880         iov[1].iov_len = len;
1881
1882         inc_rfc1001_len(req, len - 1 /* Buffer */);
1883
1884         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1885         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1886
1887         if (rc) {
1888                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1889                 goto qdir_exit;
1890         }
1891
1892         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1893                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1894                           info_buf_size);
1895         if (rc)
1896                 goto qdir_exit;
1897
1898         srch_inf->unicode = true;
1899
1900         if (srch_inf->ntwrk_buf_start) {
1901                 if (srch_inf->smallBuf)
1902                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1903                 else
1904                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1905         }
1906         srch_inf->ntwrk_buf_start = (char *)rsp;
1907         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1908                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1909         /* 4 for rfc1002 length field */
1910         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1911         srch_inf->entries_in_buffer =
1912                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1913                                     &srch_inf->last_entry, info_buf_size);
1914         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1915         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1916                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1917                  srch_inf->srch_entries_start, srch_inf->last_entry);
1918         if (resp_buftype == CIFS_LARGE_BUFFER)
1919                 srch_inf->smallBuf = false;
1920         else if (resp_buftype == CIFS_SMALL_BUFFER)
1921                 srch_inf->smallBuf = true;
1922         else
1923                 cifs_dbg(VFS, "illegal search buffer type\n");
1924
1925         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1926                 srch_inf->endOfSearch = 1;
1927         else
1928                 srch_inf->endOfSearch = 0;
1929
1930         return rc;
1931
1932 qdir_exit:
1933         free_rsp_buf(resp_buftype, rsp);
1934         return rc;
1935 }
1936
1937 static int
1938 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1939                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1940                unsigned int num, void **data, unsigned int *size)
1941 {
1942         struct smb2_set_info_req *req;
1943         struct smb2_set_info_rsp *rsp = NULL;
1944         struct kvec *iov;
1945         int rc = 0;
1946         int resp_buftype;
1947         unsigned int i;
1948         struct TCP_Server_Info *server;
1949         struct cifs_ses *ses = tcon->ses;
1950
1951         if (ses && (ses->server))
1952                 server = ses->server;
1953         else
1954                 return -EIO;
1955
1956         if (!num)
1957                 return -EINVAL;
1958
1959         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1960         if (!iov)
1961                 return -ENOMEM;
1962
1963         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1964         if (rc) {
1965                 kfree(iov);
1966                 return rc;
1967         }
1968
1969         req->hdr.ProcessId = cpu_to_le32(pid);
1970
1971         req->InfoType = SMB2_O_INFO_FILE;
1972         req->FileInfoClass = info_class;
1973         req->PersistentFileId = persistent_fid;
1974         req->VolatileFileId = volatile_fid;
1975
1976         /* 4 for RFC1001 length and 1 for Buffer */
1977         req->BufferOffset =
1978                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1979         req->BufferLength = cpu_to_le32(*size);
1980
1981         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1982
1983         memcpy(req->Buffer, *data, *size);
1984
1985         iov[0].iov_base = (char *)req;
1986         /* 4 for RFC1001 length */
1987         iov[0].iov_len = get_rfc1002_length(req) + 4;
1988
1989         for (i = 1; i < num; i++) {
1990                 inc_rfc1001_len(req, size[i]);
1991                 le32_add_cpu(&req->BufferLength, size[i]);
1992                 iov[i].iov_base = (char *)data[i];
1993                 iov[i].iov_len = size[i];
1994         }
1995
1996         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1997         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1998
1999         if (rc != 0) {
2000                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2001                 goto out;
2002         }
2003 out:
2004         free_rsp_buf(resp_buftype, rsp);
2005         kfree(iov);
2006         return rc;
2007 }
2008
2009 int
2010 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2011             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2012 {
2013         struct smb2_file_rename_info info;
2014         void **data;
2015         unsigned int size[2];
2016         int rc;
2017         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2018
2019         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2020         if (!data)
2021                 return -ENOMEM;
2022
2023         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2024                               /* 0 = fail if target already exists */
2025         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2026         info.FileNameLength = cpu_to_le32(len);
2027
2028         data[0] = &info;
2029         size[0] = sizeof(struct smb2_file_rename_info);
2030
2031         data[1] = target_file;
2032         size[1] = len + 2 /* null */;
2033
2034         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2035                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2036                            size);
2037         kfree(data);
2038         return rc;
2039 }
2040
2041 int
2042 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2043                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2044 {
2045         struct smb2_file_link_info info;
2046         void **data;
2047         unsigned int size[2];
2048         int rc;
2049         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2050
2051         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2052         if (!data)
2053                 return -ENOMEM;
2054
2055         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2056                               /* 0 = fail if link already exists */
2057         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2058         info.FileNameLength = cpu_to_le32(len);
2059
2060         data[0] = &info;
2061         size[0] = sizeof(struct smb2_file_link_info);
2062
2063         data[1] = target_file;
2064         size[1] = len + 2 /* null */;
2065
2066         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2067                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2068         kfree(data);
2069         return rc;
2070 }
2071
2072 int
2073 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2074              u64 volatile_fid, u32 pid, __le64 *eof)
2075 {
2076         struct smb2_file_eof_info info;
2077         void *data;
2078         unsigned int size;
2079
2080         info.EndOfFile = *eof;
2081
2082         data = &info;
2083         size = sizeof(struct smb2_file_eof_info);
2084
2085         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2086                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2087 }
2088
2089 int
2090 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2091               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2092 {
2093         unsigned int size;
2094         size = sizeof(FILE_BASIC_INFO);
2095         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2096                              current->tgid, FILE_BASIC_INFORMATION, 1,
2097                              (void **)&buf, &size);
2098 }
2099
2100 int
2101 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2102                   const u64 persistent_fid, const u64 volatile_fid,
2103                   __u8 oplock_level)
2104 {
2105         int rc;
2106         struct smb2_oplock_break *req = NULL;
2107
2108         cifs_dbg(FYI, "SMB2_oplock_break\n");
2109         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2110
2111         if (rc)
2112                 return rc;
2113
2114         req->VolatileFid = volatile_fid;
2115         req->PersistentFid = persistent_fid;
2116         req->OplockLevel = oplock_level;
2117         req->hdr.CreditRequest = cpu_to_le16(1);
2118
2119         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2120         /* SMB2 buffer freed by function above */
2121
2122         if (rc) {
2123                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2124                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2125         }
2126
2127         return rc;
2128 }
2129
2130 static void
2131 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2132                         struct kstatfs *kst)
2133 {
2134         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2135                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2136         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2137         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2138         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2139         return;
2140 }
2141
2142 static int
2143 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2144                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2145 {
2146         int rc;
2147         struct smb2_query_info_req *req;
2148
2149         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2150
2151         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2152                 return -EIO;
2153
2154         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2155         if (rc)
2156                 return rc;
2157
2158         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2159         req->FileInfoClass = level;
2160         req->PersistentFileId = persistent_fid;
2161         req->VolatileFileId = volatile_fid;
2162         /* 4 for rfc1002 length field and 1 for pad */
2163         req->InputBufferOffset =
2164                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2165         req->OutputBufferLength = cpu_to_le32(
2166                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2167
2168         iov->iov_base = (char *)req;
2169         /* 4 for rfc1002 length field */
2170         iov->iov_len = get_rfc1002_length(req) + 4;
2171         return 0;
2172 }
2173
2174 int
2175 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2176               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2177 {
2178         struct smb2_query_info_rsp *rsp = NULL;
2179         struct kvec iov;
2180         int rc = 0;
2181         int resp_buftype;
2182         struct cifs_ses *ses = tcon->ses;
2183         struct smb2_fs_full_size_info *info = NULL;
2184
2185         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2186                                 sizeof(struct smb2_fs_full_size_info),
2187                                 persistent_fid, volatile_fid);
2188         if (rc)
2189                 return rc;
2190
2191         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2192         if (rc) {
2193                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2194                 goto qinf_exit;
2195         }
2196         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2197
2198         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2199                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2200         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2201                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2202                           sizeof(struct smb2_fs_full_size_info));
2203         if (!rc)
2204                 copy_fs_info_to_kstatfs(info, fsdata);
2205
2206 qinf_exit:
2207         free_rsp_buf(resp_buftype, iov.iov_base);
2208         return rc;
2209 }
2210
2211 int
2212 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2213            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2214            const __u32 num_lock, struct smb2_lock_element *buf)
2215 {
2216         int rc = 0;
2217         struct smb2_lock_req *req = NULL;
2218         struct kvec iov[2];
2219         int resp_buf_type;
2220         unsigned int count;
2221
2222         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2223
2224         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2225         if (rc)
2226                 return rc;
2227
2228         req->hdr.ProcessId = cpu_to_le32(pid);
2229         req->LockCount = cpu_to_le16(num_lock);
2230
2231         req->PersistentFileId = persist_fid;
2232         req->VolatileFileId = volatile_fid;
2233
2234         count = num_lock * sizeof(struct smb2_lock_element);
2235         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2236
2237         iov[0].iov_base = (char *)req;
2238         /* 4 for rfc1002 length field and count for all locks */
2239         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2240         iov[1].iov_base = (char *)buf;
2241         iov[1].iov_len = count;
2242
2243         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2244         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2245         if (rc) {
2246                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2247                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2248         }
2249
2250         return rc;
2251 }
2252
2253 int
2254 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2255           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2256           const __u64 length, const __u64 offset, const __u32 lock_flags,
2257           const bool wait)
2258 {
2259         struct smb2_lock_element lock;
2260
2261         lock.Offset = cpu_to_le64(offset);
2262         lock.Length = cpu_to_le64(length);
2263         lock.Flags = cpu_to_le32(lock_flags);
2264         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2265                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2266
2267         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2268 }
2269
2270 int
2271 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2272                  __u8 *lease_key, const __le32 lease_state)
2273 {
2274         int rc;
2275         struct smb2_lease_ack *req = NULL;
2276
2277         cifs_dbg(FYI, "SMB2_lease_break\n");
2278         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2279
2280         if (rc)
2281                 return rc;
2282
2283         req->hdr.CreditRequest = cpu_to_le16(1);
2284         req->StructureSize = cpu_to_le16(36);
2285         inc_rfc1001_len(req, 12);
2286
2287         memcpy(req->LeaseKey, lease_key, 16);
2288         req->LeaseState = lease_state;
2289
2290         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2291         /* SMB2 buffer freed by function above */
2292
2293         if (rc) {
2294                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2295                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2296         }
2297
2298         return rc;
2299 }