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 static int
 882 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
 883 {
 884         struct smb2_create_req *req = iov[0].iov_base;
 885         unsigned int num = *num_iovec;
 886
 887         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
 888         if (iov[num].iov_base == NULL)
 889                 return -ENOMEM;
 890         iov[num].iov_len = sizeof(struct create_lease);
 891         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 892         if (!req->CreateContextsOffset)
 893                 req->CreateContextsOffset = cpu_to_le32(
 894                                 sizeof(struct smb2_create_req) - 4 +
 895                                 iov[num - 1].iov_len);
 896         req->CreateContextsLength = cpu_to_le32(
 897                                 le32_to_cpu(req->CreateContextsLength) +
 898                                 sizeof(struct create_lease));
 899         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 900         *num_iovec = num + 1;
 901         return 0;
 902 }
 903
 904 int
 905 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 906           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 907           __u32 create_disposition, __u32 create_options, __u8 *oplock,
 908           struct smb2_file_all_info *buf)
 909 {
 910         struct smb2_create_req *req;
 911         struct smb2_create_rsp *rsp;
 912         struct TCP_Server_Info *server;
 913         struct cifs_ses *ses = tcon->ses;
 914         struct kvec iov[3];
 915         int resp_buftype;
 916         int uni_path_len;
 917         __le16 *copy_path = NULL;
 918         int copy_size;
 919         int rc = 0;
 920         unsigned int num_iovecs = 2;
 921         __u32 file_attributes = 0;
 922
 923         cifs_dbg(FYI, "create/open\n");
 924
 925         if (ses && (ses->server))
 926                 server = ses->server;
 927         else
 928                 return -EIO;
 929
 930         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 931         if (rc)
 932                 return rc;
 933
 934         if (create_options & CREATE_OPTION_READONLY)
 935                 file_attributes |= ATTR_READONLY;
 936
 937         req->ImpersonationLevel = IL_IMPERSONATION;
 938         req->DesiredAccess = cpu_to_le32(desired_access);
 939         /* File attributes ignored on open (used in create though) */
 940         req->FileAttributes = cpu_to_le32(file_attributes);
 941         req->ShareAccess = FILE_SHARE_ALL_LE;
 942         req->CreateDisposition = cpu_to_le32(create_disposition);
 943         req->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
 944         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 945         /* do not count rfc1001 len field */
 946         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
 947
 948         iov[0].iov_base = (char *)req;
 949         /* 4 for rfc1002 length field */
 950         iov[0].iov_len = get_rfc1002_length(req) + 4;
 951
 952         /* MUST set path len (NameLength) to 0 opening root of share */
 953         req->NameLength = cpu_to_le16(uni_path_len - 2);
 954         /* -1 since last byte is buf[0] which is sent below (path) */
 955         iov[0].iov_len--;
 956         if (uni_path_len % 8 != 0) {
 957                 copy_size = uni_path_len / 8 * 8;
 958                 if (copy_size < uni_path_len)
 959                         copy_size += 8;
 960
 961                 copy_path = kzalloc(copy_size, GFP_KERNEL);
 962                 if (!copy_path)
 963                         return -ENOMEM;
 964                 memcpy((char *)copy_path, (const char *)path,
 965                         uni_path_len);
 966                 uni_path_len = copy_size;
 967                 path = copy_path;
 968         }
 969
 970         iov[1].iov_len = uni_path_len;
 971         iov[1].iov_base = path;
 972         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
 973         inc_rfc1001_len(req, uni_path_len - 1);
 974
 975         if (!server->oplocks)
 976                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 977
 978         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 979             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 980                 req->RequestedOplockLevel = *oplock;
 981         else {
 982                 rc = add_lease_context(iov, &num_iovecs, oplock);
 983                 if (rc) {
 984                         cifs_small_buf_release(req);
 985                         kfree(copy_path);
 986                         return rc;
 987                 }
 988         }
 989
 990         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 991         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 992
 993         if (rc != 0) {
 994                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 995                 goto creat_exit;
 996         }
 997
 998         *persistent_fid = rsp->PersistentFileId;
 999         *volatile_fid = rsp->VolatileFileId;
1000
1001         if (buf) {
1002                 memcpy(buf, &rsp->CreationTime, 32);
1003                 buf->AllocationSize = rsp->AllocationSize;
1004                 buf->EndOfFile = rsp->EndofFile;
1005                 buf->Attributes = rsp->FileAttributes;
1006                 buf->NumberOfLinks = cpu_to_le32(1);
1007                 buf->DeletePending = 0;
1008         }
1009
1010         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1011                 *oplock = parse_lease_state(rsp);
1012         else
1013                 *oplock = rsp->OplockLevel;
1014 creat_exit:
1015         kfree(copy_path);
1016         free_rsp_buf(resp_buftype, rsp);
1017         return rc;
1018 }
1019
1020 /*
1021  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1022  */
1023 int
1024 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1025            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1026            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1027 {
1028         struct smb2_ioctl_req *req;
1029         struct smb2_ioctl_rsp *rsp;
1030         struct TCP_Server_Info *server;
1031         struct cifs_ses *ses = tcon->ses;
1032         struct kvec iov[2];
1033         int resp_buftype;
1034         int num_iovecs;
1035         int rc = 0;
1036
1037         cifs_dbg(FYI, "SMB2 IOCTL\n");
1038
1039         /* zero out returned data len, in case of error */
1040         if (plen)
1041                 *plen = 0;
1042
1043         if (ses && (ses->server))
1044                 server = ses->server;
1045         else
1046                 return -EIO;
1047
1048         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1049         if (rc)
1050                 return rc;
1051
1052         req->CtlCode = cpu_to_le32(opcode);
1053         req->PersistentFileId = persistent_fid;
1054         req->VolatileFileId = volatile_fid;
1055
1056         if (indatalen) {
1057                 req->InputCount = cpu_to_le32(indatalen);
1058                 /* do not set InputOffset if no input data */
1059                 req->InputOffset =
1060                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1061                 iov[1].iov_base = in_data;
1062                 iov[1].iov_len = indatalen;
1063                 num_iovecs = 2;
1064         } else
1065                 num_iovecs = 1;
1066
1067         req->OutputOffset = 0;
1068         req->OutputCount = 0; /* MBZ */
1069
1070         /*
1071          * Could increase MaxOutputResponse, but that would require more
1072          * than one credit. Windows typically sets this smaller, but for some
1073          * ioctls it may be useful to allow server to send more. No point
1074          * limiting what the server can send as long as fits in one credit
1075          */
1076         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1077
1078         if (is_fsctl)
1079                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1080         else
1081                 req->Flags = 0;
1082
1083         iov[0].iov_base = (char *)req;
1084         /* 4 for rfc1002 length field */
1085         iov[0].iov_len = get_rfc1002_length(req) + 4;
1086
1087         if (indatalen)
1088                 inc_rfc1001_len(req, indatalen);
1089
1090         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1091         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1092
1093         if (rc != 0) {
1094                 if (tcon)
1095                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1096                 goto ioctl_exit;
1097         }
1098
1099         /* check if caller wants to look at return data or just return rc */
1100         if ((plen == NULL) || (out_data == NULL))
1101                 goto ioctl_exit;
1102
1103         *plen = le32_to_cpu(rsp->OutputCount);
1104
1105         /* We check for obvious errors in the output buffer length and offset */
1106         if (*plen == 0)
1107                 goto ioctl_exit; /* server returned no data */
1108         else if (*plen > 0xFF00) {
1109                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1110                 *plen = 0;
1111                 rc = -EIO;
1112                 goto ioctl_exit;
1113         }
1114
1115         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1116                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1117                         le32_to_cpu(rsp->OutputOffset));
1118                 *plen = 0;
1119                 rc = -EIO;
1120                 goto ioctl_exit;
1121         }
1122
1123         *out_data = kmalloc(*plen, GFP_KERNEL);
1124         if (*out_data == NULL) {
1125                 rc = -ENOMEM;
1126                 goto ioctl_exit;
1127         }
1128
1129         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1130                *plen);
1131 ioctl_exit:
1132         free_rsp_buf(resp_buftype, rsp);
1133         return rc;
1134 }
1135
1136 int
1137 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1138            u64 persistent_fid, u64 volatile_fid)
1139 {
1140         struct smb2_close_req *req;
1141         struct smb2_close_rsp *rsp;
1142         struct TCP_Server_Info *server;
1143         struct cifs_ses *ses = tcon->ses;
1144         struct kvec iov[1];
1145         int resp_buftype;
1146         int rc = 0;
1147
1148         cifs_dbg(FYI, "Close\n");
1149
1150         if (ses && (ses->server))
1151                 server = ses->server;
1152         else
1153                 return -EIO;
1154
1155         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1156         if (rc)
1157                 return rc;
1158
1159         req->PersistentFileId = persistent_fid;
1160         req->VolatileFileId = volatile_fid;
1161
1162         iov[0].iov_base = (char *)req;
1163         /* 4 for rfc1002 length field */
1164         iov[0].iov_len = get_rfc1002_length(req) + 4;
1165
1166         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1167         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1168
1169         if (rc != 0) {
1170                 if (tcon)
1171                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1172                 goto close_exit;
1173         }
1174
1175         /* BB FIXME - decode close response, update inode for caching */
1176
1177 close_exit:
1178         free_rsp_buf(resp_buftype, rsp);
1179         return rc;
1180 }
1181
1182 static int
1183 validate_buf(unsigned int offset, unsigned int buffer_length,
1184              struct smb2_hdr *hdr, unsigned int min_buf_size)
1185
1186 {
1187         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1188         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1189         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1190         char *end_of_buf = begin_of_buf + buffer_length;
1191
1192
1193         if (buffer_length < min_buf_size) {
1194                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1195                          buffer_length, min_buf_size);
1196                 return -EINVAL;
1197         }
1198
1199         /* check if beyond RFC1001 maximum length */
1200         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1201                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1202                          buffer_length, smb_len);
1203                 return -EINVAL;
1204         }
1205
1206         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1207                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1208                 return -EINVAL;
1209         }
1210
1211         return 0;
1212 }
1213
1214 /*
1215  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1216  * Caller must free buffer.
1217  */
1218 static int
1219 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1220                       struct smb2_hdr *hdr, unsigned int minbufsize,
1221                       char *data)
1222
1223 {
1224         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1225         int rc;
1226
1227         if (!data)
1228                 return -EINVAL;
1229
1230         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1231         if (rc)
1232                 return rc;
1233
1234         memcpy(data, begin_of_buf, buffer_length);
1235
1236         return 0;
1237 }
1238
1239 static int
1240 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1241            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1242            size_t output_len, size_t min_len, void *data)
1243 {
1244         struct smb2_query_info_req *req;
1245         struct smb2_query_info_rsp *rsp = NULL;
1246         struct kvec iov[2];
1247         int rc = 0;
1248         int resp_buftype;
1249         struct TCP_Server_Info *server;
1250         struct cifs_ses *ses = tcon->ses;
1251
1252         cifs_dbg(FYI, "Query Info\n");
1253
1254         if (ses && (ses->server))
1255                 server = ses->server;
1256         else
1257                 return -EIO;
1258
1259         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1260         if (rc)
1261                 return rc;
1262
1263         req->InfoType = SMB2_O_INFO_FILE;
1264         req->FileInfoClass = info_class;
1265         req->PersistentFileId = persistent_fid;
1266         req->VolatileFileId = volatile_fid;
1267         /* 4 for rfc1002 length field and 1 for Buffer */
1268         req->InputBufferOffset =
1269                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1270         req->OutputBufferLength = cpu_to_le32(output_len);
1271
1272         iov[0].iov_base = (char *)req;
1273         /* 4 for rfc1002 length field */
1274         iov[0].iov_len = get_rfc1002_length(req) + 4;
1275
1276         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1277         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1278
1279         if (rc) {
1280                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1281                 goto qinf_exit;
1282         }
1283
1284         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1285                                    le32_to_cpu(rsp->OutputBufferLength),
1286                                    &rsp->hdr, min_len, data);
1287
1288 qinf_exit:
1289         free_rsp_buf(resp_buftype, rsp);
1290         return rc;
1291 }
1292
1293 int
1294 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1295                 u64 persistent_fid, u64 volatile_fid,
1296                 struct smb2_file_all_info *data)
1297 {
1298         return query_info(xid, tcon, persistent_fid, volatile_fid,
1299                           FILE_ALL_INFORMATION,
1300                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1301                           sizeof(struct smb2_file_all_info), data);
1302 }
1303
1304 int
1305 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1306                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1307 {
1308         return query_info(xid, tcon, persistent_fid, volatile_fid,
1309                           FILE_INTERNAL_INFORMATION,
1310                           sizeof(struct smb2_file_internal_info),
1311                           sizeof(struct smb2_file_internal_info), uniqueid);
1312 }
1313
1314 /*
1315  * This is a no-op for now. We're not really interested in the reply, but
1316  * rather in the fact that the server sent one and that server->lstrp
1317  * gets updated.
1318  *
1319  * FIXME: maybe we should consider checking that the reply matches request?
1320  */
1321 static void
1322 smb2_echo_callback(struct mid_q_entry *mid)
1323 {
1324         struct TCP_Server_Info *server = mid->callback_data;
1325         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1326         unsigned int credits_received = 1;
1327
1328         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1329                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1330
1331         DeleteMidQEntry(mid);
1332         add_credits(server, credits_received, CIFS_ECHO_OP);
1333 }
1334
1335 int
1336 SMB2_echo(struct TCP_Server_Info *server)
1337 {
1338         struct smb2_echo_req *req;
1339         int rc = 0;
1340         struct kvec iov;
1341         struct smb_rqst rqst = { .rq_iov = &iov,
1342                                  .rq_nvec = 1 };
1343
1344         cifs_dbg(FYI, "In echo request\n");
1345
1346         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1347         if (rc)
1348                 return rc;
1349
1350         req->hdr.CreditRequest = cpu_to_le16(1);
1351
1352         iov.iov_base = (char *)req;
1353         /* 4 for rfc1002 length field */
1354         iov.iov_len = get_rfc1002_length(req) + 4;
1355
1356         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1357                              CIFS_ECHO_OP);
1358         if (rc)
1359                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1360
1361         cifs_small_buf_release(req);
1362         return rc;
1363 }
1364
1365 int
1366 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1367            u64 volatile_fid)
1368 {
1369         struct smb2_flush_req *req;
1370         struct TCP_Server_Info *server;
1371         struct cifs_ses *ses = tcon->ses;
1372         struct kvec iov[1];
1373         int resp_buftype;
1374         int rc = 0;
1375
1376         cifs_dbg(FYI, "Flush\n");
1377
1378         if (ses && (ses->server))
1379                 server = ses->server;
1380         else
1381                 return -EIO;
1382
1383         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1384         if (rc)
1385                 return rc;
1386
1387         req->PersistentFileId = persistent_fid;
1388         req->VolatileFileId = volatile_fid;
1389
1390         iov[0].iov_base = (char *)req;
1391         /* 4 for rfc1002 length field */
1392         iov[0].iov_len = get_rfc1002_length(req) + 4;
1393
1394         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1395
1396         if ((rc != 0) && tcon)
1397                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1398
1399         free_rsp_buf(resp_buftype, iov[0].iov_base);
1400         return rc;
1401 }
1402
1403 /*
1404  * To form a chain of read requests, any read requests after the first should
1405  * have the end_of_chain boolean set to true.
1406  */
1407 static int
1408 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1409                   unsigned int remaining_bytes, int request_type)
1410 {
1411         int rc = -EACCES;
1412         struct smb2_read_req *req = NULL;
1413
1414         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1415         if (rc)
1416                 return rc;
1417         if (io_parms->tcon->ses->server == NULL)
1418                 return -ECONNABORTED;
1419
1420         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1421
1422         req->PersistentFileId = io_parms->persistent_fid;
1423         req->VolatileFileId = io_parms->volatile_fid;
1424         req->ReadChannelInfoOffset = 0; /* reserved */
1425         req->ReadChannelInfoLength = 0; /* reserved */
1426         req->Channel = 0; /* reserved */
1427         req->MinimumCount = 0;
1428         req->Length = cpu_to_le32(io_parms->length);
1429         req->Offset = cpu_to_le64(io_parms->offset);
1430
1431         if (request_type & CHAINED_REQUEST) {
1432                 if (!(request_type & END_OF_CHAIN)) {
1433                         /* 4 for rfc1002 length field */
1434                         req->hdr.NextCommand =
1435                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1436                 } else /* END_OF_CHAIN */
1437                         req->hdr.NextCommand = 0;
1438                 if (request_type & RELATED_REQUEST) {
1439                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1440                         /*
1441                          * Related requests use info from previous read request
1442                          * in chain.
1443                          */
1444                         req->hdr.SessionId = 0xFFFFFFFF;
1445                         req->hdr.TreeId = 0xFFFFFFFF;
1446                         req->PersistentFileId = 0xFFFFFFFF;
1447                         req->VolatileFileId = 0xFFFFFFFF;
1448                 }
1449         }
1450         if (remaining_bytes > io_parms->length)
1451                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1452         else
1453                 req->RemainingBytes = 0;
1454
1455         iov[0].iov_base = (char *)req;
1456         /* 4 for rfc1002 length field */
1457         iov[0].iov_len = get_rfc1002_length(req) + 4;
1458         return rc;
1459 }
1460
1461 static void
1462 smb2_readv_callback(struct mid_q_entry *mid)
1463 {
1464         struct cifs_readdata *rdata = mid->callback_data;
1465         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1466         struct TCP_Server_Info *server = tcon->ses->server;
1467         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1468         unsigned int credits_received = 1;
1469         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1470                                  .rq_nvec = 1,
1471                                  .rq_pages = rdata->pages,
1472                                  .rq_npages = rdata->nr_pages,
1473                                  .rq_pagesz = rdata->pagesz,
1474                                  .rq_tailsz = rdata->tailsz };
1475
1476         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1477                  __func__, mid->mid, mid->mid_state, rdata->result,
1478                  rdata->bytes);
1479
1480         switch (mid->mid_state) {
1481         case MID_RESPONSE_RECEIVED:
1482                 credits_received = le16_to_cpu(buf->CreditRequest);
1483                 /* result already set, check signature */
1484                 if (server->sign) {
1485                         int rc;
1486
1487                         rc = smb2_verify_signature(&rqst, server);
1488                         if (rc)
1489                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1490                                          rc);
1491                 }
1492                 /* FIXME: should this be counted toward the initiating task? */
1493                 task_io_account_read(rdata->bytes);
1494                 cifs_stats_bytes_read(tcon, rdata->bytes);
1495                 break;
1496         case MID_REQUEST_SUBMITTED:
1497         case MID_RETRY_NEEDED:
1498                 rdata->result = -EAGAIN;
1499                 break;
1500         default:
1501                 if (rdata->result != -ENODATA)
1502                         rdata->result = -EIO;
1503         }
1504
1505         if (rdata->result)
1506                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1507
1508         queue_work(cifsiod_wq, &rdata->work);
1509         DeleteMidQEntry(mid);
1510         add_credits(server, credits_received, 0);
1511 }
1512
1513 /* smb2_async_readv - send an async write, and set up mid to handle result */
1514 int
1515 smb2_async_readv(struct cifs_readdata *rdata)
1516 {
1517         int rc;
1518         struct smb2_hdr *buf;
1519         struct cifs_io_parms io_parms;
1520         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1521                                  .rq_nvec = 1 };
1522
1523         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1524                  __func__, rdata->offset, rdata->bytes);
1525
1526         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1527         io_parms.offset = rdata->offset;
1528         io_parms.length = rdata->bytes;
1529         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1530         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1531         io_parms.pid = rdata->pid;
1532         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1533         if (rc)
1534                 return rc;
1535
1536         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1537         /* 4 for rfc1002 length field */
1538         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1539
1540         kref_get(&rdata->refcount);
1541         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1542                              cifs_readv_receive, smb2_readv_callback,
1543                              rdata, 0);
1544         if (rc) {
1545                 kref_put(&rdata->refcount, cifs_readdata_release);
1546                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1547         }
1548
1549         cifs_small_buf_release(buf);
1550         return rc;
1551 }
1552
1553 int
1554 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1555           unsigned int *nbytes, char **buf, int *buf_type)
1556 {
1557         int resp_buftype, rc = -EACCES;
1558         struct smb2_read_rsp *rsp = NULL;
1559         struct kvec iov[1];
1560
1561         *nbytes = 0;
1562         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1563         if (rc)
1564                 return rc;
1565
1566         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1567                           &resp_buftype, CIFS_LOG_ERROR);
1568
1569         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1570
1571         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1572                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1573                 return 0;
1574         }
1575
1576         if (rc) {
1577                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1578                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1579         } else {
1580                 *nbytes = le32_to_cpu(rsp->DataLength);
1581                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1582                     (*nbytes > io_parms->length)) {
1583                         cifs_dbg(FYI, "bad length %d for count %d\n",
1584                                  *nbytes, io_parms->length);
1585                         rc = -EIO;
1586                         *nbytes = 0;
1587                 }
1588         }
1589
1590         if (*buf) {
1591                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1592                        *nbytes);
1593                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1594         } else if (resp_buftype != CIFS_NO_BUFFER) {
1595                 *buf = iov[0].iov_base;
1596                 if (resp_buftype == CIFS_SMALL_BUFFER)
1597                         *buf_type = CIFS_SMALL_BUFFER;
1598                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1599                         *buf_type = CIFS_LARGE_BUFFER;
1600         }
1601         return rc;
1602 }
1603
1604 /*
1605  * Check the mid_state and signature on received buffer (if any), and queue the
1606  * workqueue completion task.
1607  */
1608 static void
1609 smb2_writev_callback(struct mid_q_entry *mid)
1610 {
1611         struct cifs_writedata *wdata = mid->callback_data;
1612         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1613         unsigned int written;
1614         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1615         unsigned int credits_received = 1;
1616
1617         switch (mid->mid_state) {
1618         case MID_RESPONSE_RECEIVED:
1619                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1620                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1621                 if (wdata->result != 0)
1622                         break;
1623
1624                 written = le32_to_cpu(rsp->DataLength);
1625                 /*
1626                  * Mask off high 16 bits when bytes written as returned
1627                  * by the server is greater than bytes requested by the
1628                  * client. OS/2 servers are known to set incorrect
1629                  * CountHigh values.
1630                  */
1631                 if (written > wdata->bytes)
1632                         written &= 0xFFFF;
1633
1634                 if (written < wdata->bytes)
1635                         wdata->result = -ENOSPC;
1636                 else
1637                         wdata->bytes = written;
1638                 break;
1639         case MID_REQUEST_SUBMITTED:
1640         case MID_RETRY_NEEDED:
1641                 wdata->result = -EAGAIN;
1642                 break;
1643         default:
1644                 wdata->result = -EIO;
1645                 break;
1646         }
1647
1648         if (wdata->result)
1649                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1650
1651         queue_work(cifsiod_wq, &wdata->work);
1652         DeleteMidQEntry(mid);
1653         add_credits(tcon->ses->server, credits_received, 0);
1654 }
1655
1656 /* smb2_async_writev - send an async write, and set up mid to handle result */
1657 int
1658 smb2_async_writev(struct cifs_writedata *wdata)
1659 {
1660         int rc = -EACCES;
1661         struct smb2_write_req *req = NULL;
1662         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1663         struct kvec iov;
1664         struct smb_rqst rqst;
1665
1666         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1667         if (rc)
1668                 goto async_writev_out;
1669
1670         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1671
1672         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1673         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1674         req->WriteChannelInfoOffset = 0;
1675         req->WriteChannelInfoLength = 0;
1676         req->Channel = 0;
1677         req->Offset = cpu_to_le64(wdata->offset);
1678         /* 4 for rfc1002 length field */
1679         req->DataOffset = cpu_to_le16(
1680                                 offsetof(struct smb2_write_req, Buffer) - 4);
1681         req->RemainingBytes = 0;
1682
1683         /* 4 for rfc1002 length field and 1 for Buffer */
1684         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1685         iov.iov_base = req;
1686
1687         rqst.rq_iov = &iov;
1688         rqst.rq_nvec = 1;
1689         rqst.rq_pages = wdata->pages;
1690         rqst.rq_npages = wdata->nr_pages;
1691         rqst.rq_pagesz = wdata->pagesz;
1692         rqst.rq_tailsz = wdata->tailsz;
1693
1694         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1695                  wdata->offset, wdata->bytes);
1696
1697         req->Length = cpu_to_le32(wdata->bytes);
1698
1699         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1700
1701         kref_get(&wdata->refcount);
1702         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1703                                 smb2_writev_callback, wdata, 0);
1704
1705         if (rc) {
1706                 kref_put(&wdata->refcount, cifs_writedata_release);
1707                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1708         }
1709
1710 async_writev_out:
1711         cifs_small_buf_release(req);
1712         return rc;
1713 }
1714
1715 /*
1716  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1717  * The length field from io_parms must be at least 1 and indicates a number of
1718  * elements with data to write that begins with position 1 in iov array. All
1719  * data length is specified by count.
1720  */
1721 int
1722 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1723            unsigned int *nbytes, struct kvec *iov, int n_vec)
1724 {
1725         int rc = 0;
1726         struct smb2_write_req *req = NULL;
1727         struct smb2_write_rsp *rsp = NULL;
1728         int resp_buftype;
1729         *nbytes = 0;
1730
1731         if (n_vec < 1)
1732                 return rc;
1733
1734         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1735         if (rc)
1736                 return rc;
1737
1738         if (io_parms->tcon->ses->server == NULL)
1739                 return -ECONNABORTED;
1740
1741         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1742
1743         req->PersistentFileId = io_parms->persistent_fid;
1744         req->VolatileFileId = io_parms->volatile_fid;
1745         req->WriteChannelInfoOffset = 0;
1746         req->WriteChannelInfoLength = 0;
1747         req->Channel = 0;
1748         req->Length = cpu_to_le32(io_parms->length);
1749         req->Offset = cpu_to_le64(io_parms->offset);
1750         /* 4 for rfc1002 length field */
1751         req->DataOffset = cpu_to_le16(
1752                                 offsetof(struct smb2_write_req, Buffer) - 4);
1753         req->RemainingBytes = 0;
1754
1755         iov[0].iov_base = (char *)req;
1756         /* 4 for rfc1002 length field and 1 for Buffer */
1757         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1758
1759         /* length of entire message including data to be written */
1760         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1761
1762         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1763                           &resp_buftype, 0);
1764         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1765
1766         if (rc) {
1767                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1768                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1769         } else
1770                 *nbytes = le32_to_cpu(rsp->DataLength);
1771
1772         free_rsp_buf(resp_buftype, rsp);
1773         return rc;
1774 }
1775
1776 static unsigned int
1777 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1778 {
1779         int len;
1780         unsigned int entrycount = 0;
1781         unsigned int next_offset = 0;
1782         FILE_DIRECTORY_INFO *entryptr;
1783
1784         if (bufstart == NULL)
1785                 return 0;
1786
1787         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1788
1789         while (1) {
1790                 entryptr = (FILE_DIRECTORY_INFO *)
1791                                         ((char *)entryptr + next_offset);
1792
1793                 if ((char *)entryptr + size > end_of_buf) {
1794                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1795                         break;
1796                 }
1797
1798                 len = le32_to_cpu(entryptr->FileNameLength);
1799                 if ((char *)entryptr + len + size > end_of_buf) {
1800                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1801                                  end_of_buf);
1802                         break;
1803                 }
1804
1805                 *lastentry = (char *)entryptr;
1806                 entrycount++;
1807
1808                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1809                 if (!next_offset)
1810                         break;
1811         }
1812
1813         return entrycount;
1814 }
1815
1816 /*
1817  * Readdir/FindFirst
1818  */
1819 int
1820 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1821                      u64 persistent_fid, u64 volatile_fid, int index,
1822                      struct cifs_search_info *srch_inf)
1823 {
1824         struct smb2_query_directory_req *req;
1825         struct smb2_query_directory_rsp *rsp = NULL;
1826         struct kvec iov[2];
1827         int rc = 0;
1828         int len;
1829         int resp_buftype;
1830         unsigned char *bufptr;
1831         struct TCP_Server_Info *server;
1832         struct cifs_ses *ses = tcon->ses;
1833         __le16 asteriks = cpu_to_le16('*');
1834         char *end_of_smb;
1835         unsigned int output_size = CIFSMaxBufSize;
1836         size_t info_buf_size;
1837
1838         if (ses && (ses->server))
1839                 server = ses->server;
1840         else
1841                 return -EIO;
1842
1843         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1844         if (rc)
1845                 return rc;
1846
1847         switch (srch_inf->info_level) {
1848         case SMB_FIND_FILE_DIRECTORY_INFO:
1849                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1850                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1851                 break;
1852         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1853                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1854                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1855                 break;
1856         default:
1857                 cifs_dbg(VFS, "info level %u isn't supported\n",
1858                          srch_inf->info_level);
1859                 rc = -EINVAL;
1860                 goto qdir_exit;
1861         }
1862
1863         req->FileIndex = cpu_to_le32(index);
1864         req->PersistentFileId = persistent_fid;
1865         req->VolatileFileId = volatile_fid;
1866
1867         len = 0x2;
1868         bufptr = req->Buffer;
1869         memcpy(bufptr, &asteriks, len);
1870
1871         req->FileNameOffset =
1872                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1873         req->FileNameLength = cpu_to_le16(len);
1874         /*
1875          * BB could be 30 bytes or so longer if we used SMB2 specific
1876          * buffer lengths, but this is safe and close enough.
1877          */
1878         output_size = min_t(unsigned int, output_size, server->maxBuf);
1879         output_size = min_t(unsigned int, output_size, 2 << 15);
1880         req->OutputBufferLength = cpu_to_le32(output_size);
1881
1882         iov[0].iov_base = (char *)req;
1883         /* 4 for RFC1001 length and 1 for Buffer */
1884         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1885
1886         iov[1].iov_base = (char *)(req->Buffer);
1887         iov[1].iov_len = len;
1888
1889         inc_rfc1001_len(req, len - 1 /* Buffer */);
1890
1891         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1892         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1893
1894         if (rc) {
1895                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1896                 goto qdir_exit;
1897         }
1898
1899         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1900                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1901                           info_buf_size);
1902         if (rc)
1903                 goto qdir_exit;
1904
1905         srch_inf->unicode = true;
1906
1907         if (srch_inf->ntwrk_buf_start) {
1908                 if (srch_inf->smallBuf)
1909                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1910                 else
1911                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1912         }
1913         srch_inf->ntwrk_buf_start = (char *)rsp;
1914         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1915                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1916         /* 4 for rfc1002 length field */
1917         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1918         srch_inf->entries_in_buffer =
1919                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1920                                     &srch_inf->last_entry, info_buf_size);
1921         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1922         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1923                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1924                  srch_inf->srch_entries_start, srch_inf->last_entry);
1925         if (resp_buftype == CIFS_LARGE_BUFFER)
1926                 srch_inf->smallBuf = false;
1927         else if (resp_buftype == CIFS_SMALL_BUFFER)
1928                 srch_inf->smallBuf = true;
1929         else
1930                 cifs_dbg(VFS, "illegal search buffer type\n");
1931
1932         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1933                 srch_inf->endOfSearch = 1;
1934         else
1935                 srch_inf->endOfSearch = 0;
1936
1937         return rc;
1938
1939 qdir_exit:
1940         free_rsp_buf(resp_buftype, rsp);
1941         return rc;
1942 }
1943
1944 static int
1945 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1946                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1947                unsigned int num, void **data, unsigned int *size)
1948 {
1949         struct smb2_set_info_req *req;
1950         struct smb2_set_info_rsp *rsp = NULL;
1951         struct kvec *iov;
1952         int rc = 0;
1953         int resp_buftype;
1954         unsigned int i;
1955         struct TCP_Server_Info *server;
1956         struct cifs_ses *ses = tcon->ses;
1957
1958         if (ses && (ses->server))
1959                 server = ses->server;
1960         else
1961                 return -EIO;
1962
1963         if (!num)
1964                 return -EINVAL;
1965
1966         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1967         if (!iov)
1968                 return -ENOMEM;
1969
1970         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1971         if (rc) {
1972                 kfree(iov);
1973                 return rc;
1974         }
1975
1976         req->hdr.ProcessId = cpu_to_le32(pid);
1977
1978         req->InfoType = SMB2_O_INFO_FILE;
1979         req->FileInfoClass = info_class;
1980         req->PersistentFileId = persistent_fid;
1981         req->VolatileFileId = volatile_fid;
1982
1983         /* 4 for RFC1001 length and 1 for Buffer */
1984         req->BufferOffset =
1985                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1986         req->BufferLength = cpu_to_le32(*size);
1987
1988         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1989
1990         memcpy(req->Buffer, *data, *size);
1991
1992         iov[0].iov_base = (char *)req;
1993         /* 4 for RFC1001 length */
1994         iov[0].iov_len = get_rfc1002_length(req) + 4;
1995
1996         for (i = 1; i < num; i++) {
1997                 inc_rfc1001_len(req, size[i]);
1998                 le32_add_cpu(&req->BufferLength, size[i]);
1999                 iov[i].iov_base = (char *)data[i];
2000                 iov[i].iov_len = size[i];
2001         }
2002
2003         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2004         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2005
2006         if (rc != 0) {
2007                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2008                 goto out;
2009         }
2010 out:
2011         free_rsp_buf(resp_buftype, rsp);
2012         kfree(iov);
2013         return rc;
2014 }
2015
2016 int
2017 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2018             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2019 {
2020         struct smb2_file_rename_info info;
2021         void **data;
2022         unsigned int size[2];
2023         int rc;
2024         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2025
2026         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2027         if (!data)
2028                 return -ENOMEM;
2029
2030         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2031                               /* 0 = fail if target already exists */
2032         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2033         info.FileNameLength = cpu_to_le32(len);
2034
2035         data[0] = &info;
2036         size[0] = sizeof(struct smb2_file_rename_info);
2037
2038         data[1] = target_file;
2039         size[1] = len + 2 /* null */;
2040
2041         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2042                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2043                            size);
2044         kfree(data);
2045         return rc;
2046 }
2047
2048 int
2049 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2050                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2051 {
2052         struct smb2_file_link_info info;
2053         void **data;
2054         unsigned int size[2];
2055         int rc;
2056         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2057
2058         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2059         if (!data)
2060                 return -ENOMEM;
2061
2062         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2063                               /* 0 = fail if link already exists */
2064         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2065         info.FileNameLength = cpu_to_le32(len);
2066
2067         data[0] = &info;
2068         size[0] = sizeof(struct smb2_file_link_info);
2069
2070         data[1] = target_file;
2071         size[1] = len + 2 /* null */;
2072
2073         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2074                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2075         kfree(data);
2076         return rc;
2077 }
2078
2079 int
2080 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2081              u64 volatile_fid, u32 pid, __le64 *eof)
2082 {
2083         struct smb2_file_eof_info info;
2084         void *data;
2085         unsigned int size;
2086
2087         info.EndOfFile = *eof;
2088
2089         data = &info;
2090         size = sizeof(struct smb2_file_eof_info);
2091
2092         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2093                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2094 }
2095
2096 int
2097 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2098               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2099 {
2100         unsigned int size;
2101         size = sizeof(FILE_BASIC_INFO);
2102         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2103                              current->tgid, FILE_BASIC_INFORMATION, 1,
2104                              (void **)&buf, &size);
2105 }
2106
2107 int
2108 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2109                   const u64 persistent_fid, const u64 volatile_fid,
2110                   __u8 oplock_level)
2111 {
2112         int rc;
2113         struct smb2_oplock_break *req = NULL;
2114
2115         cifs_dbg(FYI, "SMB2_oplock_break\n");
2116         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2117
2118         if (rc)
2119                 return rc;
2120
2121         req->VolatileFid = volatile_fid;
2122         req->PersistentFid = persistent_fid;
2123         req->OplockLevel = oplock_level;
2124         req->hdr.CreditRequest = cpu_to_le16(1);
2125
2126         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2127         /* SMB2 buffer freed by function above */
2128
2129         if (rc) {
2130                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2131                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2132         }
2133
2134         return rc;
2135 }
2136
2137 static void
2138 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2139                         struct kstatfs *kst)
2140 {
2141         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2142                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2143         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2144         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2145         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2146         return;
2147 }
2148
2149 static int
2150 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2151                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2152 {
2153         int rc;
2154         struct smb2_query_info_req *req;
2155
2156         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2157
2158         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2159                 return -EIO;
2160
2161         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2162         if (rc)
2163                 return rc;
2164
2165         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2166         req->FileInfoClass = level;
2167         req->PersistentFileId = persistent_fid;
2168         req->VolatileFileId = volatile_fid;
2169         /* 4 for rfc1002 length field and 1 for pad */
2170         req->InputBufferOffset =
2171                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2172         req->OutputBufferLength = cpu_to_le32(
2173                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2174
2175         iov->iov_base = (char *)req;
2176         /* 4 for rfc1002 length field */
2177         iov->iov_len = get_rfc1002_length(req) + 4;
2178         return 0;
2179 }
2180
2181 int
2182 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2183               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2184 {
2185         struct smb2_query_info_rsp *rsp = NULL;
2186         struct kvec iov;
2187         int rc = 0;
2188         int resp_buftype;
2189         struct cifs_ses *ses = tcon->ses;
2190         struct smb2_fs_full_size_info *info = NULL;
2191
2192         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2193                                 sizeof(struct smb2_fs_full_size_info),
2194                                 persistent_fid, volatile_fid);
2195         if (rc)
2196                 return rc;
2197
2198         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2199         if (rc) {
2200                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2201                 goto qinf_exit;
2202         }
2203         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2204
2205         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2206                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2207         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2208                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2209                           sizeof(struct smb2_fs_full_size_info));
2210         if (!rc)
2211                 copy_fs_info_to_kstatfs(info, fsdata);
2212
2213 qinf_exit:
2214         free_rsp_buf(resp_buftype, iov.iov_base);
2215         return rc;
2216 }
2217
2218 int
2219 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2220            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2221            const __u32 num_lock, struct smb2_lock_element *buf)
2222 {
2223         int rc = 0;
2224         struct smb2_lock_req *req = NULL;
2225         struct kvec iov[2];
2226         int resp_buf_type;
2227         unsigned int count;
2228
2229         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2230
2231         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2232         if (rc)
2233                 return rc;
2234
2235         req->hdr.ProcessId = cpu_to_le32(pid);
2236         req->LockCount = cpu_to_le16(num_lock);
2237
2238         req->PersistentFileId = persist_fid;
2239         req->VolatileFileId = volatile_fid;
2240
2241         count = num_lock * sizeof(struct smb2_lock_element);
2242         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2243
2244         iov[0].iov_base = (char *)req;
2245         /* 4 for rfc1002 length field and count for all locks */
2246         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2247         iov[1].iov_base = (char *)buf;
2248         iov[1].iov_len = count;
2249
2250         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2251         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2252         if (rc) {
2253                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2254                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2255         }
2256
2257         return rc;
2258 }
2259
2260 int
2261 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2262           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2263           const __u64 length, const __u64 offset, const __u32 lock_flags,
2264           const bool wait)
2265 {
2266         struct smb2_lock_element lock;
2267
2268         lock.Offset = cpu_to_le64(offset);
2269         lock.Length = cpu_to_le64(length);
2270         lock.Flags = cpu_to_le32(lock_flags);
2271         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2272                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2273
2274         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2275 }
2276
2277 int
2278 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2279                  __u8 *lease_key, const __le32 lease_state)
2280 {
2281         int rc;
2282         struct smb2_lease_ack *req = NULL;
2283
2284         cifs_dbg(FYI, "SMB2_lease_break\n");
2285         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2286
2287         if (rc)
2288                 return rc;
2289
2290         req->hdr.CreditRequest = cpu_to_le16(1);
2291         req->StructureSize = cpu_to_le16(36);
2292         inc_rfc1001_len(req, 12);
2293
2294         memcpy(req->LeaseKey, lease_key, 16);
2295         req->LeaseState = lease_state;
2296
2297         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2298         /* SMB2 buffer freed by function above */
2299
2300         if (rc) {
2301                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2302                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2303         }
2304
2305         return rc;
2306 }