fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2012
   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         hdr->TreeId = tcon->tid;
 112         /* Uid is not converted */
 113         if (tcon->ses)
 114                 hdr->SessionId = tcon->ses->Suid;
 115         /* BB check following DFS flags BB */
 116         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
 117         if (tcon->share_flags & SHI1005_FLAGS_DFS)
 118                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
 119         /* BB how does SMB2 do case sensitive? */
 120         /* if (tcon->nocase)
 121                 hdr->Flags |= SMBFLG_CASELESS; */
 122         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 123                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 124 out:
 125         pdu->StructureSize2 = cpu_to_le16(parmsize);
 126         return;
 127 }
 128
 129 static int
 130 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 131 {
 132         int rc = 0;
 133         struct nls_table *nls_codepage;
 134         struct cifs_ses *ses;
 135         struct TCP_Server_Info *server;
 136
 137         /*
 138          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 139          * check for tcp and smb session status done differently
 140          * for those three - in the calling routine.
 141          */
 142         if (tcon == NULL)
 143                 return rc;
 144
 145         if (smb2_command == SMB2_TREE_CONNECT)
 146                 return rc;
 147
 148         if (tcon->tidStatus == CifsExiting) {
 149                 /*
 150                  * only tree disconnect, open, and write,
 151                  * (and ulogoff which does not have tcon)
 152                  * are allowed as we start force umount.
 153                  */
 154                 if ((smb2_command != SMB2_WRITE) &&
 155                    (smb2_command != SMB2_CREATE) &&
 156                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 157                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 158                                  smb2_command);
 159                         return -ENODEV;
 160                 }
 161         }
 162         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 163             (!tcon->ses->server))
 164                 return -EIO;
 165
 166         ses = tcon->ses;
 167         server = ses->server;
 168
 169         /*
 170          * Give demultiplex thread up to 10 seconds to reconnect, should be
 171          * greater than cifs socket timeout which is 7 seconds
 172          */
 173         while (server->tcpStatus == CifsNeedReconnect) {
 174                 /*
 175                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 176                  * here since they are implicitly done when session drops.
 177                  */
 178                 switch (smb2_command) {
 179                 /*
 180                  * BB Should we keep oplock break and add flush to exceptions?
 181                  */
 182                 case SMB2_TREE_DISCONNECT:
 183                 case SMB2_CANCEL:
 184                 case SMB2_CLOSE:
 185                 case SMB2_OPLOCK_BREAK:
 186                         return -EAGAIN;
 187                 }
 188
 189                 wait_event_interruptible_timeout(server->response_q,
 190                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 191
 192                 /* are we still trying to reconnect? */
 193                 if (server->tcpStatus != CifsNeedReconnect)
 194                         break;
 195
 196                 /*
 197                  * on "soft" mounts we wait once. Hard mounts keep
 198                  * retrying until process is killed or server comes
 199                  * back on-line
 200                  */
 201                 if (!tcon->retry) {
 202                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 203                         return -EHOSTDOWN;
 204                 }
 205         }
 206
 207         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 208                 return rc;
 209
 210         nls_codepage = load_nls_default();
 211
 212         /*
 213          * need to prevent multiple threads trying to simultaneously reconnect
 214          * the same SMB session
 215          */
 216         mutex_lock(&tcon->ses->session_mutex);
 217         rc = cifs_negotiate_protocol(0, tcon->ses);
 218         if (!rc && tcon->ses->need_reconnect)
 219                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 220
 221         if (rc || !tcon->need_reconnect) {
 222                 mutex_unlock(&tcon->ses->session_mutex);
 223                 goto out;
 224         }
 225
 226         cifs_mark_open_files_invalid(tcon);
 227         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 228         mutex_unlock(&tcon->ses->session_mutex);
 229         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 230         if (rc)
 231                 goto out;
 232         atomic_inc(&tconInfoReconnectCount);
 233         /*
 234          * BB FIXME add code to check if wsize needs update due to negotiated
 235          * smb buffer size shrinking.
 236          */
 237 out:
 238         /*
 239          * Check if handle based operation so we know whether we can continue
 240          * or not without returning to caller to reset file handle.
 241          */
 242         /*
 243          * BB Is flush done by server on drop of tcp session? Should we special
 244          * case it and skip above?
 245          */
 246         switch (smb2_command) {
 247         case SMB2_FLUSH:
 248         case SMB2_READ:
 249         case SMB2_WRITE:
 250         case SMB2_LOCK:
 251         case SMB2_IOCTL:
 252         case SMB2_QUERY_DIRECTORY:
 253         case SMB2_CHANGE_NOTIFY:
 254         case SMB2_QUERY_INFO:
 255         case SMB2_SET_INFO:
 256                 return -EAGAIN;
 257         }
 258         unload_nls(nls_codepage);
 259         return rc;
 260 }
 261
 262 /*
 263  * Allocate and return pointer to an SMB request hdr, and set basic
 264  * SMB information in the SMB header. If the return code is zero, this
 265  * function must have filled in request_buf pointer.
 266  */
 267 static int
 268 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 269                 void **request_buf)
 270 {
 271         int rc = 0;
 272
 273         rc = smb2_reconnect(smb2_command, tcon);
 274         if (rc)
 275                 return rc;
 276
 277         /* BB eventually switch this to SMB2 specific small buf size */
 278         *request_buf = cifs_small_buf_get();
 279         if (*request_buf == NULL) {
 280                 /* BB should we add a retry in here if not a writepage? */
 281                 return -ENOMEM;
 282         }
 283
 284         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 285
 286         if (tcon != NULL) {
 287 #ifdef CONFIG_CIFS_STATS2
 288                 uint16_t com_code = le16_to_cpu(smb2_command);
 289                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 290 #endif
 291                 cifs_stats_inc(&tcon->num_smbs_sent);
 292         }
 293
 294         return rc;
 295 }
 296
 297 static void
 298 free_rsp_buf(int resp_buftype, void *rsp)
 299 {
 300         if (resp_buftype == CIFS_SMALL_BUFFER)
 301                 cifs_small_buf_release(rsp);
 302         else if (resp_buftype == CIFS_LARGE_BUFFER)
 303                 cifs_buf_release(rsp);
 304 }
 305
 306
 307 /*
 308  *
 309  *      SMB2 Worker functions follow:
 310  *
 311  *      The general structure of the worker functions is:
 312  *      1) Call smb2_init (assembles SMB2 header)
 313  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 314  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 315  *      4) Decode SMB2 command specific fields in the fixed length area
 316  *      5) Decode variable length data area (if any for this SMB2 command type)
 317  *      6) Call free smb buffer
 318  *      7) return
 319  *
 320  */
 321
 322 int
 323 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 324 {
 325         struct smb2_negotiate_req *req;
 326         struct smb2_negotiate_rsp *rsp;
 327         struct kvec iov[1];
 328         int rc = 0;
 329         int resp_buftype;
 330         struct TCP_Server_Info *server = ses->server;
 331         unsigned int sec_flags;
 332         int blob_offset, blob_length;
 333         char *security_blob;
 334         int flags = CIFS_NEG_OP;
 335
 336         cifs_dbg(FYI, "Negotiate protocol\n");
 337
 338         if (!server) {
 339                 WARN(1, "%s: server is NULL!\n", __func__);
 340                 return -EIO;
 341         }
 342
 343         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 344         if (rc)
 345                 return rc;
 346
 347         /* if any of auth flags (ie not sign or seal) are overriden use them */
 348         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 349                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 350         else /* if override flags set only sign/seal OR them with global auth */
 351                 sec_flags = global_secflags | ses->overrideSecFlg;
 352
 353         cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
 354
 355         req->hdr.SessionId = 0;
 356
 357         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 358
 359         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 360         inc_rfc1001_len(req, 2);
 361
 362         /* only one of SMB2 signing flags may be set in SMB2 request */
 363         if (ses->sign)
 364                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 365         else if (global_secflags & CIFSSEC_MAY_SIGN)
 366                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 367         else
 368                 req->SecurityMode = 0;
 369
 370         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 371
 372         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 373
 374         iov[0].iov_base = (char *)req;
 375         /* 4 for rfc1002 length field */
 376         iov[0].iov_len = get_rfc1002_length(req) + 4;
 377
 378         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 379
 380         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 381         /*
 382          * No tcon so can't do
 383          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 384          */
 385         if (rc != 0)
 386                 goto neg_exit;
 387
 388         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 389
 390         /* BB we may eventually want to match the negotiated vs. requested
 391            dialect, even though we are only requesting one at a time */
 392         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 393                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 394         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 395                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 396         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 397                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 398         else {
 399                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 400                          le16_to_cpu(rsp->DialectRevision));
 401                 rc = -EIO;
 402                 goto neg_exit;
 403         }
 404         server->dialect = le16_to_cpu(rsp->DialectRevision);
 405
 406         /* SMB2 only has an extended negflavor */
 407         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 408         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 409         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 410         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 411         /* BB Do we need to validate the SecurityMode? */
 412         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 413         server->capabilities = le32_to_cpu(rsp->Capabilities);
 414         /* Internal types */
 415         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 416
 417         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 418                                                &rsp->hdr);
 419         if (blob_length == 0) {
 420                 cifs_dbg(VFS, "missing security blob on negprot\n");
 421                 rc = -EIO;
 422                 goto neg_exit;
 423         }
 424
 425         rc = cifs_enable_signing(server, ses->sign);
 426 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 427         if (rc)
 428                 goto neg_exit;
 429
 430         rc = decode_neg_token_init(security_blob, blob_length,
 431                                    &server->sec_type);
 432         if (rc == 1)
 433                 rc = 0;
 434         else if (rc == 0) {
 435                 rc = -EIO;
 436                 goto neg_exit;
 437         }
 438 #endif
 439
 440 neg_exit:
 441         free_rsp_buf(resp_buftype, rsp);
 442         return rc;
 443 }
 444
 445 int
 446 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 447                 const struct nls_table *nls_cp)
 448 {
 449         struct smb2_sess_setup_req *req;
 450         struct smb2_sess_setup_rsp *rsp = NULL;
 451         struct kvec iov[2];
 452         int rc = 0;
 453         int resp_buftype;
 454         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 455         struct TCP_Server_Info *server = ses->server;
 456         unsigned int sec_flags;
 457         u16 blob_length = 0;
 458         char *security_blob;
 459         char *ntlmssp_blob = NULL;
 460         bool use_spnego = false; /* else use raw ntlmssp */
 461
 462         cifs_dbg(FYI, "Session Setup\n");
 463
 464         if (!server) {
 465                 WARN(1, "%s: server is NULL!\n", __func__);
 466                 return -EIO;
 467         }
 468
 469         /*
 470          * If memory allocation is successful, caller of this function
 471          * frees it.
 472          */
 473         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 474         if (!ses->ntlmssp)
 475                 return -ENOMEM;
 476
 477         ses->server->secType = RawNTLMSSP;
 478
 479 ssetup_ntlmssp_authenticate:
 480         if (phase == NtLmChallenge)
 481                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 482
 483         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 484         if (rc)
 485                 return rc;
 486
 487         /* if any of auth flags (ie not sign or seal) are overriden use them */
 488         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 489                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 490         else /* if override flags set only sign/seal OR them with global auth */
 491                 sec_flags = global_secflags | ses->overrideSecFlg;
 492
 493         cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
 494
 495         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 496         req->VcNumber = 0; /* MBZ */
 497         /* to enable echos and oplocks */
 498         req->hdr.CreditRequest = cpu_to_le16(3);
 499
 500         /* only one of SMB2 signing flags may be set in SMB2 request */
 501         if (server->sign)
 502                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 503         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 504                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 505         else
 506                 req->SecurityMode = 0;
 507
 508         req->Capabilities = 0;
 509         req->Channel = 0; /* MBZ */
 510
 511         iov[0].iov_base = (char *)req;
 512         /* 4 for rfc1002 length field and 1 for pad */
 513         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 514         if (phase == NtLmNegotiate) {
 515                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 516                                        GFP_KERNEL);
 517                 if (ntlmssp_blob == NULL) {
 518                         rc = -ENOMEM;
 519                         goto ssetup_exit;
 520                 }
 521                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 522                 if (use_spnego) {
 523                         /* blob_length = build_spnego_ntlmssp_blob(
 524                                         &security_blob,
 525                                         sizeof(struct _NEGOTIATE_MESSAGE),
 526                                         ntlmssp_blob); */
 527                         /* BB eventually need to add this */
 528                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 529                         rc = -EOPNOTSUPP;
 530                         kfree(ntlmssp_blob);
 531                         goto ssetup_exit;
 532                 } else {
 533                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 534                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 535                         security_blob = ntlmssp_blob;
 536                 }
 537         } else if (phase == NtLmAuthenticate) {
 538                 req->hdr.SessionId = ses->Suid;
 539                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 540                                        GFP_KERNEL);
 541                 if (ntlmssp_blob == NULL) {
 542                         rc = -ENOMEM;
 543                         goto ssetup_exit;
 544                 }
 545                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 546                                              nls_cp);
 547                 if (rc) {
 548                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 549                                  rc);
 550                         goto ssetup_exit; /* BB double check error handling */
 551                 }
 552                 if (use_spnego) {
 553                         /* blob_length = build_spnego_ntlmssp_blob(
 554                                                         &security_blob,
 555                                                         blob_length,
 556                                                         ntlmssp_blob); */
 557                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 558                         rc = -EOPNOTSUPP;
 559                         kfree(ntlmssp_blob);
 560                         goto ssetup_exit;
 561                 } else {
 562                         security_blob = ntlmssp_blob;
 563                 }
 564         } else {
 565                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 566                 rc = -EIO;
 567                 goto ssetup_exit;
 568         }
 569
 570         /* Testing shows that buffer offset must be at location of Buffer[0] */
 571         req->SecurityBufferOffset =
 572                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 573                                             1 /* pad */ - 4 /* rfc1001 len */);
 574         req->SecurityBufferLength = cpu_to_le16(blob_length);
 575         iov[1].iov_base = security_blob;
 576         iov[1].iov_len = blob_length;
 577
 578         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 579
 580         /* BB add code to build os and lm fields */
 581
 582         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 583                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 584
 585         kfree(security_blob);
 586         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 587         if (resp_buftype != CIFS_NO_BUFFER &&
 588             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 589                 if (phase != NtLmNegotiate) {
 590                         cifs_dbg(VFS, "Unexpected more processing error\n");
 591                         goto ssetup_exit;
 592                 }
 593                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 594                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 595                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 596                                  le16_to_cpu(rsp->SecurityBufferOffset));
 597                         rc = -EIO;
 598                         goto ssetup_exit;
 599                 }
 600
 601                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 602                 phase = NtLmChallenge; /* process ntlmssp challenge */
 603                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 604                 ses->Suid = rsp->hdr.SessionId;
 605                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 606                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 607         }
 608
 609         /*
 610          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 611          * but at least the raw NTLMSSP case works.
 612          */
 613         /*
 614          * No tcon so can't do
 615          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 616          */
 617         if (rc != 0)
 618                 goto ssetup_exit;
 619
 620         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 621 ssetup_exit:
 622         free_rsp_buf(resp_buftype, rsp);
 623
 624         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 625         if ((phase == NtLmChallenge) && (rc == 0))
 626                 goto ssetup_ntlmssp_authenticate;
 627         return rc;
 628 }
 629
 630 int
 631 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 632 {
 633         struct smb2_logoff_req *req; /* response is also trivial struct */
 634         int rc = 0;
 635         struct TCP_Server_Info *server;
 636
 637         cifs_dbg(FYI, "disconnect session %p\n", ses);
 638
 639         if (ses && (ses->server))
 640                 server = ses->server;
 641         else
 642                 return -EIO;
 643
 644         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 645         if (rc)
 646                 return rc;
 647
 648          /* since no tcon, smb2_init can not do this, so do here */
 649         req->hdr.SessionId = ses->Suid;
 650         if (server->sign)
 651                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 652
 653         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 654         /*
 655          * No tcon so can't do
 656          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 657          */
 658         return rc;
 659 }
 660
 661 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 662 {
 663         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 664 }
 665
 666 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 667
 668 int
 669 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 670           struct cifs_tcon *tcon, const struct nls_table *cp)
 671 {
 672         struct smb2_tree_connect_req *req;
 673         struct smb2_tree_connect_rsp *rsp = NULL;
 674         struct kvec iov[2];
 675         int rc = 0;
 676         int resp_buftype;
 677         int unc_path_len;
 678         struct TCP_Server_Info *server;
 679         __le16 *unc_path = NULL;
 680
 681         cifs_dbg(FYI, "TCON\n");
 682
 683         if ((ses->server) && tree)
 684                 server = ses->server;
 685         else
 686                 return -EIO;
 687
 688         if (tcon && tcon->bad_network_name)
 689                 return -ENOENT;
 690
 691         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 692         if (unc_path == NULL)
 693                 return -ENOMEM;
 694
 695         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 696         unc_path_len *= 2;
 697         if (unc_path_len < 2) {
 698                 kfree(unc_path);
 699                 return -EINVAL;
 700         }
 701
 702         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 703         if (rc) {
 704                 kfree(unc_path);
 705                 return rc;
 706         }
 707
 708         if (tcon == NULL) {
 709                 /* since no tcon, smb2_init can not do this, so do here */
 710                 req->hdr.SessionId = ses->Suid;
 711                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 712                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 713         }
 714
 715         iov[0].iov_base = (char *)req;
 716         /* 4 for rfc1002 length field and 1 for pad */
 717         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 718
 719         /* Testing shows that buffer offset must be at location of Buffer[0] */
 720         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 721                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 722         req->PathLength = cpu_to_le16(unc_path_len - 2);
 723         iov[1].iov_base = unc_path;
 724         iov[1].iov_len = unc_path_len;
 725
 726         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 727
 728         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 729         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 730
 731         if (rc != 0) {
 732                 if (tcon) {
 733                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 734                         tcon->need_reconnect = true;
 735                 }
 736                 goto tcon_error_exit;
 737         }
 738
 739         if (tcon == NULL) {
 740                 ses->ipc_tid = rsp->hdr.TreeId;
 741                 goto tcon_exit;
 742         }
 743
 744         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 745                 cifs_dbg(FYI, "connection to disk share\n");
 746         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 747                 tcon->ipc = true;
 748                 cifs_dbg(FYI, "connection to pipe share\n");
 749         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 750                 tcon->print = true;
 751                 cifs_dbg(FYI, "connection to printer\n");
 752         } else {
 753                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 754                 rc = -EOPNOTSUPP;
 755                 goto tcon_error_exit;
 756         }
 757
 758         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 759         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 760         tcon->tidStatus = CifsGood;
 761         tcon->need_reconnect = false;
 762         tcon->tid = rsp->hdr.TreeId;
 763         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 764
 765         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 766             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 767                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 768
 769 tcon_exit:
 770         free_rsp_buf(resp_buftype, rsp);
 771         kfree(unc_path);
 772         return rc;
 773
 774 tcon_error_exit:
 775         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 776                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 777                 tcon->bad_network_name = true;
 778         }
 779         goto tcon_exit;
 780 }
 781
 782 int
 783 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 784 {
 785         struct smb2_tree_disconnect_req *req; /* response is trivial */
 786         int rc = 0;
 787         struct TCP_Server_Info *server;
 788         struct cifs_ses *ses = tcon->ses;
 789
 790         cifs_dbg(FYI, "Tree Disconnect\n");
 791
 792         if (ses && (ses->server))
 793                 server = ses->server;
 794         else
 795                 return -EIO;
 796
 797         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 798                 return 0;
 799
 800         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 801         if (rc)
 802                 return rc;
 803
 804         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 805         if (rc)
 806                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 807
 808         return rc;
 809 }
 810
 811 static struct create_lease *
 812 create_lease_buf(u8 *lease_key, u8 oplock)
 813 {
 814         struct create_lease *buf;
 815
 816         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 817         if (!buf)
 818                 return NULL;
 819
 820         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 821         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 822         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 823                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 824                                            SMB2_LEASE_READ_CACHING;
 825         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 826                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 827         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 828                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 829                                            SMB2_LEASE_READ_CACHING |
 830                                            SMB2_LEASE_WRITE_CACHING;
 831
 832         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 833                                         (struct create_lease, lcontext));
 834         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 835         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 836                                 (struct create_lease, Name));
 837         buf->ccontext.NameLength = cpu_to_le16(4);
 838         buf->Name[0] = 'R';
 839         buf->Name[1] = 'q';
 840         buf->Name[2] = 'L';
 841         buf->Name[3] = 's';
 842         return buf;
 843 }
 844
 845 static __u8
 846 parse_lease_state(struct smb2_create_rsp *rsp)
 847 {
 848         char *data_offset;
 849         struct create_lease *lc;
 850         bool found = false;
 851
 852         data_offset = (char *)rsp;
 853         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 854         lc = (struct create_lease *)data_offset;
 855         do {
 856                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 857                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 858                     strncmp(name, "RqLs", 4)) {
 859                         lc = (struct create_lease *)((char *)lc
 860                                         + le32_to_cpu(lc->ccontext.Next));
 861                         continue;
 862                 }
 863                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 864                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 865                 found = true;
 866                 break;
 867         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 868
 869         if (!found)
 870                 return 0;
 871
 872         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 873 }
 874
 875 int
 876 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 877           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 878           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 879           __u8 *oplock, struct smb2_file_all_info *buf)
 880 {
 881         struct smb2_create_req *req;
 882         struct smb2_create_rsp *rsp;
 883         struct TCP_Server_Info *server;
 884         struct cifs_ses *ses = tcon->ses;
 885         struct kvec iov[3];
 886         int resp_buftype;
 887         int uni_path_len;
 888         __le16 *copy_path = NULL;
 889         int copy_size;
 890         int rc = 0;
 891         int num_iovecs = 2;
 892
 893         cifs_dbg(FYI, "create/open\n");
 894
 895         if (ses && (ses->server))
 896                 server = ses->server;
 897         else
 898                 return -EIO;
 899
 900         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 901         if (rc)
 902                 return rc;
 903
 904         req->ImpersonationLevel = IL_IMPERSONATION;
 905         req->DesiredAccess = cpu_to_le32(desired_access);
 906         /* File attributes ignored on open (used in create though) */
 907         req->FileAttributes = cpu_to_le32(file_attributes);
 908         req->ShareAccess = FILE_SHARE_ALL_LE;
 909         req->CreateDisposition = cpu_to_le32(create_disposition);
 910         req->CreateOptions = cpu_to_le32(create_options);
 911         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 912         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 913                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 914
 915         iov[0].iov_base = (char *)req;
 916         /* 4 for rfc1002 length field */
 917         iov[0].iov_len = get_rfc1002_length(req) + 4;
 918
 919         /* MUST set path len (NameLength) to 0 opening root of share */
 920         if (uni_path_len >= 4) {
 921                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 922                 /* -1 since last byte is buf[0] which is sent below (path) */
 923                 iov[0].iov_len--;
 924                 if (uni_path_len % 8 != 0) {
 925                         copy_size = uni_path_len / 8 * 8;
 926                         if (copy_size < uni_path_len)
 927                                 copy_size += 8;
 928
 929                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 930                         if (!copy_path)
 931                                 return -ENOMEM;
 932                         memcpy((char *)copy_path, (const char *)path,
 933                                 uni_path_len);
 934                         uni_path_len = copy_size;
 935                         path = copy_path;
 936                 }
 937
 938                 iov[1].iov_len = uni_path_len;
 939                 iov[1].iov_base = path;
 940                 /*
 941                  * -1 since last byte is buf[0] which was counted in
 942                  * smb2_buf_len.
 943                  */
 944                 inc_rfc1001_len(req, uni_path_len - 1);
 945         } else {
 946                 iov[0].iov_len += 7;
 947                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 948                                 req->hdr.smb2_buf_length) + 8 - 1);
 949                 num_iovecs = 1;
 950                 req->NameLength = 0;
 951         }
 952
 953         if (!server->oplocks)
 954                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 955
 956         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 957             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 958                 req->RequestedOplockLevel = *oplock;
 959         else {
 960                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 961                 if (iov[num_iovecs].iov_base == NULL) {
 962                         cifs_small_buf_release(req);
 963                         kfree(copy_path);
 964                         return -ENOMEM;
 965                 }
 966                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
 967                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 968                 req->CreateContextsOffset = cpu_to_le32(
 969                         sizeof(struct smb2_create_req) - 4 - 8 +
 970                         iov[num_iovecs-1].iov_len);
 971                 req->CreateContextsLength = cpu_to_le32(
 972                         sizeof(struct create_lease));
 973                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 974                 num_iovecs++;
 975         }
 976
 977         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 978         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 979
 980         if (rc != 0) {
 981                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 982                 goto creat_exit;
 983         }
 984
 985         *persistent_fid = rsp->PersistentFileId;
 986         *volatile_fid = rsp->VolatileFileId;
 987
 988         if (buf) {
 989                 memcpy(buf, &rsp->CreationTime, 32);
 990                 buf->AllocationSize = rsp->AllocationSize;
 991                 buf->EndOfFile = rsp->EndofFile;
 992                 buf->Attributes = rsp->FileAttributes;
 993                 buf->NumberOfLinks = cpu_to_le32(1);
 994                 buf->DeletePending = 0;
 995         }
 996
 997         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
 998                 *oplock = parse_lease_state(rsp);
 999         else
1000                 *oplock = rsp->OplockLevel;
1001 creat_exit:
1002         kfree(copy_path);
1003         free_rsp_buf(resp_buftype, rsp);
1004         return rc;
1005 }
1006
1007 int
1008 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1009            u64 persistent_fid, u64 volatile_fid)
1010 {
1011         struct smb2_close_req *req;
1012         struct smb2_close_rsp *rsp;
1013         struct TCP_Server_Info *server;
1014         struct cifs_ses *ses = tcon->ses;
1015         struct kvec iov[1];
1016         int resp_buftype;
1017         int rc = 0;
1018
1019         cifs_dbg(FYI, "Close\n");
1020
1021         if (ses && (ses->server))
1022                 server = ses->server;
1023         else
1024                 return -EIO;
1025
1026         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1027         if (rc)
1028                 return rc;
1029
1030         req->PersistentFileId = persistent_fid;
1031         req->VolatileFileId = volatile_fid;
1032
1033         iov[0].iov_base = (char *)req;
1034         /* 4 for rfc1002 length field */
1035         iov[0].iov_len = get_rfc1002_length(req) + 4;
1036
1037         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1038         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1039
1040         if (rc != 0) {
1041                 if (tcon)
1042                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1043                 goto close_exit;
1044         }
1045
1046         /* BB FIXME - decode close response, update inode for caching */
1047
1048 close_exit:
1049         free_rsp_buf(resp_buftype, rsp);
1050         return rc;
1051 }
1052
1053 static int
1054 validate_buf(unsigned int offset, unsigned int buffer_length,
1055              struct smb2_hdr *hdr, unsigned int min_buf_size)
1056
1057 {
1058         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1059         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1060         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1061         char *end_of_buf = begin_of_buf + buffer_length;
1062
1063
1064         if (buffer_length < min_buf_size) {
1065                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1066                          buffer_length, min_buf_size);
1067                 return -EINVAL;
1068         }
1069
1070         /* check if beyond RFC1001 maximum length */
1071         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1072                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1073                          buffer_length, smb_len);
1074                 return -EINVAL;
1075         }
1076
1077         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1078                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1079                 return -EINVAL;
1080         }
1081
1082         return 0;
1083 }
1084
1085 /*
1086  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1087  * Caller must free buffer.
1088  */
1089 static int
1090 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1091                       struct smb2_hdr *hdr, unsigned int minbufsize,
1092                       char *data)
1093
1094 {
1095         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1096         int rc;
1097
1098         if (!data)
1099                 return -EINVAL;
1100
1101         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1102         if (rc)
1103                 return rc;
1104
1105         memcpy(data, begin_of_buf, buffer_length);
1106
1107         return 0;
1108 }
1109
1110 static int
1111 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1112            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1113            size_t output_len, size_t min_len, void *data)
1114 {
1115         struct smb2_query_info_req *req;
1116         struct smb2_query_info_rsp *rsp = NULL;
1117         struct kvec iov[2];
1118         int rc = 0;
1119         int resp_buftype;
1120         struct TCP_Server_Info *server;
1121         struct cifs_ses *ses = tcon->ses;
1122
1123         cifs_dbg(FYI, "Query Info\n");
1124
1125         if (ses && (ses->server))
1126                 server = ses->server;
1127         else
1128                 return -EIO;
1129
1130         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1131         if (rc)
1132                 return rc;
1133
1134         req->InfoType = SMB2_O_INFO_FILE;
1135         req->FileInfoClass = info_class;
1136         req->PersistentFileId = persistent_fid;
1137         req->VolatileFileId = volatile_fid;
1138         /* 4 for rfc1002 length field and 1 for Buffer */
1139         req->InputBufferOffset =
1140                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1141         req->OutputBufferLength = cpu_to_le32(output_len);
1142
1143         iov[0].iov_base = (char *)req;
1144         /* 4 for rfc1002 length field */
1145         iov[0].iov_len = get_rfc1002_length(req) + 4;
1146
1147         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1148         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1149
1150         if (rc) {
1151                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1152                 goto qinf_exit;
1153         }
1154
1155         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1156                                    le32_to_cpu(rsp->OutputBufferLength),
1157                                    &rsp->hdr, min_len, data);
1158
1159 qinf_exit:
1160         free_rsp_buf(resp_buftype, rsp);
1161         return rc;
1162 }
1163
1164 int
1165 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1166                 u64 persistent_fid, u64 volatile_fid,
1167                 struct smb2_file_all_info *data)
1168 {
1169         return query_info(xid, tcon, persistent_fid, volatile_fid,
1170                           FILE_ALL_INFORMATION,
1171                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1172                           sizeof(struct smb2_file_all_info), data);
1173 }
1174
1175 int
1176 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1177                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1178 {
1179         return query_info(xid, tcon, persistent_fid, volatile_fid,
1180                           FILE_INTERNAL_INFORMATION,
1181                           sizeof(struct smb2_file_internal_info),
1182                           sizeof(struct smb2_file_internal_info), uniqueid);
1183 }
1184
1185 /*
1186  * This is a no-op for now. We're not really interested in the reply, but
1187  * rather in the fact that the server sent one and that server->lstrp
1188  * gets updated.
1189  *
1190  * FIXME: maybe we should consider checking that the reply matches request?
1191  */
1192 static void
1193 smb2_echo_callback(struct mid_q_entry *mid)
1194 {
1195         struct TCP_Server_Info *server = mid->callback_data;
1196         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1197         unsigned int credits_received = 1;
1198
1199         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1200                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1201
1202         DeleteMidQEntry(mid);
1203         add_credits(server, credits_received, CIFS_ECHO_OP);
1204 }
1205
1206 int
1207 SMB2_echo(struct TCP_Server_Info *server)
1208 {
1209         struct smb2_echo_req *req;
1210         int rc = 0;
1211         struct kvec iov;
1212         struct smb_rqst rqst = { .rq_iov = &iov,
1213                                  .rq_nvec = 1 };
1214
1215         cifs_dbg(FYI, "In echo request\n");
1216
1217         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1218         if (rc)
1219                 return rc;
1220
1221         req->hdr.CreditRequest = cpu_to_le16(1);
1222
1223         iov.iov_base = (char *)req;
1224         /* 4 for rfc1002 length field */
1225         iov.iov_len = get_rfc1002_length(req) + 4;
1226
1227         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1228                              CIFS_ECHO_OP);
1229         if (rc)
1230                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1231
1232         cifs_small_buf_release(req);
1233         return rc;
1234 }
1235
1236 int
1237 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1238            u64 volatile_fid)
1239 {
1240         struct smb2_flush_req *req;
1241         struct TCP_Server_Info *server;
1242         struct cifs_ses *ses = tcon->ses;
1243         struct kvec iov[1];
1244         int resp_buftype;
1245         int rc = 0;
1246
1247         cifs_dbg(FYI, "Flush\n");
1248
1249         if (ses && (ses->server))
1250                 server = ses->server;
1251         else
1252                 return -EIO;
1253
1254         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1255         if (rc)
1256                 return rc;
1257
1258         req->PersistentFileId = persistent_fid;
1259         req->VolatileFileId = volatile_fid;
1260
1261         iov[0].iov_base = (char *)req;
1262         /* 4 for rfc1002 length field */
1263         iov[0].iov_len = get_rfc1002_length(req) + 4;
1264
1265         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1266
1267         if ((rc != 0) && tcon)
1268                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1269
1270         free_rsp_buf(resp_buftype, iov[0].iov_base);
1271         return rc;
1272 }
1273
1274 /*
1275  * To form a chain of read requests, any read requests after the first should
1276  * have the end_of_chain boolean set to true.
1277  */
1278 static int
1279 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1280                   unsigned int remaining_bytes, int request_type)
1281 {
1282         int rc = -EACCES;
1283         struct smb2_read_req *req = NULL;
1284
1285         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1286         if (rc)
1287                 return rc;
1288         if (io_parms->tcon->ses->server == NULL)
1289                 return -ECONNABORTED;
1290
1291         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1292
1293         req->PersistentFileId = io_parms->persistent_fid;
1294         req->VolatileFileId = io_parms->volatile_fid;
1295         req->ReadChannelInfoOffset = 0; /* reserved */
1296         req->ReadChannelInfoLength = 0; /* reserved */
1297         req->Channel = 0; /* reserved */
1298         req->MinimumCount = 0;
1299         req->Length = cpu_to_le32(io_parms->length);
1300         req->Offset = cpu_to_le64(io_parms->offset);
1301
1302         if (request_type & CHAINED_REQUEST) {
1303                 if (!(request_type & END_OF_CHAIN)) {
1304                         /* 4 for rfc1002 length field */
1305                         req->hdr.NextCommand =
1306                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1307                 } else /* END_OF_CHAIN */
1308                         req->hdr.NextCommand = 0;
1309                 if (request_type & RELATED_REQUEST) {
1310                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1311                         /*
1312                          * Related requests use info from previous read request
1313                          * in chain.
1314                          */
1315                         req->hdr.SessionId = 0xFFFFFFFF;
1316                         req->hdr.TreeId = 0xFFFFFFFF;
1317                         req->PersistentFileId = 0xFFFFFFFF;
1318                         req->VolatileFileId = 0xFFFFFFFF;
1319                 }
1320         }
1321         if (remaining_bytes > io_parms->length)
1322                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1323         else
1324                 req->RemainingBytes = 0;
1325
1326         iov[0].iov_base = (char *)req;
1327         /* 4 for rfc1002 length field */
1328         iov[0].iov_len = get_rfc1002_length(req) + 4;
1329         return rc;
1330 }
1331
1332 static void
1333 smb2_readv_callback(struct mid_q_entry *mid)
1334 {
1335         struct cifs_readdata *rdata = mid->callback_data;
1336         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1337         struct TCP_Server_Info *server = tcon->ses->server;
1338         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1339         unsigned int credits_received = 1;
1340         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1341                                  .rq_nvec = 1,
1342                                  .rq_pages = rdata->pages,
1343                                  .rq_npages = rdata->nr_pages,
1344                                  .rq_pagesz = rdata->pagesz,
1345                                  .rq_tailsz = rdata->tailsz };
1346
1347         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1348                  __func__, mid->mid, mid->mid_state, rdata->result,
1349                  rdata->bytes);
1350
1351         switch (mid->mid_state) {
1352         case MID_RESPONSE_RECEIVED:
1353                 credits_received = le16_to_cpu(buf->CreditRequest);
1354                 /* result already set, check signature */
1355                 if (server->sign) {
1356                         int rc;
1357
1358                         rc = smb2_verify_signature(&rqst, server);
1359                         if (rc)
1360                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1361                                          rc);
1362                 }
1363                 /* FIXME: should this be counted toward the initiating task? */
1364                 task_io_account_read(rdata->bytes);
1365                 cifs_stats_bytes_read(tcon, rdata->bytes);
1366                 break;
1367         case MID_REQUEST_SUBMITTED:
1368         case MID_RETRY_NEEDED:
1369                 rdata->result = -EAGAIN;
1370                 break;
1371         default:
1372                 if (rdata->result != -ENODATA)
1373                         rdata->result = -EIO;
1374         }
1375
1376         if (rdata->result)
1377                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1378
1379         queue_work(cifsiod_wq, &rdata->work);
1380         DeleteMidQEntry(mid);
1381         add_credits(server, credits_received, 0);
1382 }
1383
1384 /* smb2_async_readv - send an async write, and set up mid to handle result */
1385 int
1386 smb2_async_readv(struct cifs_readdata *rdata)
1387 {
1388         int rc;
1389         struct smb2_hdr *buf;
1390         struct cifs_io_parms io_parms;
1391         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1392                                  .rq_nvec = 1 };
1393
1394         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1395                  __func__, rdata->offset, rdata->bytes);
1396
1397         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1398         io_parms.offset = rdata->offset;
1399         io_parms.length = rdata->bytes;
1400         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1401         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1402         io_parms.pid = rdata->pid;
1403         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1404         if (rc)
1405                 return rc;
1406
1407         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1408         /* 4 for rfc1002 length field */
1409         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1410
1411         kref_get(&rdata->refcount);
1412         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1413                              cifs_readv_receive, smb2_readv_callback,
1414                              rdata, 0);
1415         if (rc) {
1416                 kref_put(&rdata->refcount, cifs_readdata_release);
1417                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1418         }
1419
1420         cifs_small_buf_release(buf);
1421         return rc;
1422 }
1423
1424 int
1425 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1426           unsigned int *nbytes, char **buf, int *buf_type)
1427 {
1428         int resp_buftype, rc = -EACCES;
1429         struct smb2_read_rsp *rsp = NULL;
1430         struct kvec iov[1];
1431
1432         *nbytes = 0;
1433         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1434         if (rc)
1435                 return rc;
1436
1437         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1438                           &resp_buftype, CIFS_LOG_ERROR);
1439
1440         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1441
1442         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1443                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1444                 return 0;
1445         }
1446
1447         if (rc) {
1448                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1449                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1450         } else {
1451                 *nbytes = le32_to_cpu(rsp->DataLength);
1452                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1453                     (*nbytes > io_parms->length)) {
1454                         cifs_dbg(FYI, "bad length %d for count %d\n",
1455                                  *nbytes, io_parms->length);
1456                         rc = -EIO;
1457                         *nbytes = 0;
1458                 }
1459         }
1460
1461         if (*buf) {
1462                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1463                        *nbytes);
1464                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1465         } else if (resp_buftype != CIFS_NO_BUFFER) {
1466                 *buf = iov[0].iov_base;
1467                 if (resp_buftype == CIFS_SMALL_BUFFER)
1468                         *buf_type = CIFS_SMALL_BUFFER;
1469                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1470                         *buf_type = CIFS_LARGE_BUFFER;
1471         }
1472         return rc;
1473 }
1474
1475 /*
1476  * Check the mid_state and signature on received buffer (if any), and queue the
1477  * workqueue completion task.
1478  */
1479 static void
1480 smb2_writev_callback(struct mid_q_entry *mid)
1481 {
1482         struct cifs_writedata *wdata = mid->callback_data;
1483         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1484         unsigned int written;
1485         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1486         unsigned int credits_received = 1;
1487
1488         switch (mid->mid_state) {
1489         case MID_RESPONSE_RECEIVED:
1490                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1491                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1492                 if (wdata->result != 0)
1493                         break;
1494
1495                 written = le32_to_cpu(rsp->DataLength);
1496                 /*
1497                  * Mask off high 16 bits when bytes written as returned
1498                  * by the server is greater than bytes requested by the
1499                  * client. OS/2 servers are known to set incorrect
1500                  * CountHigh values.
1501                  */
1502                 if (written > wdata->bytes)
1503                         written &= 0xFFFF;
1504
1505                 if (written < wdata->bytes)
1506                         wdata->result = -ENOSPC;
1507                 else
1508                         wdata->bytes = written;
1509                 break;
1510         case MID_REQUEST_SUBMITTED:
1511         case MID_RETRY_NEEDED:
1512                 wdata->result = -EAGAIN;
1513                 break;
1514         default:
1515                 wdata->result = -EIO;
1516                 break;
1517         }
1518
1519         if (wdata->result)
1520                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1521
1522         queue_work(cifsiod_wq, &wdata->work);
1523         DeleteMidQEntry(mid);
1524         add_credits(tcon->ses->server, credits_received, 0);
1525 }
1526
1527 /* smb2_async_writev - send an async write, and set up mid to handle result */
1528 int
1529 smb2_async_writev(struct cifs_writedata *wdata)
1530 {
1531         int rc = -EACCES;
1532         struct smb2_write_req *req = NULL;
1533         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1534         struct kvec iov;
1535         struct smb_rqst rqst;
1536
1537         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1538         if (rc)
1539                 goto async_writev_out;
1540
1541         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1542
1543         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1544         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1545         req->WriteChannelInfoOffset = 0;
1546         req->WriteChannelInfoLength = 0;
1547         req->Channel = 0;
1548         req->Offset = cpu_to_le64(wdata->offset);
1549         /* 4 for rfc1002 length field */
1550         req->DataOffset = cpu_to_le16(
1551                                 offsetof(struct smb2_write_req, Buffer) - 4);
1552         req->RemainingBytes = 0;
1553
1554         /* 4 for rfc1002 length field and 1 for Buffer */
1555         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1556         iov.iov_base = req;
1557
1558         rqst.rq_iov = &iov;
1559         rqst.rq_nvec = 1;
1560         rqst.rq_pages = wdata->pages;
1561         rqst.rq_npages = wdata->nr_pages;
1562         rqst.rq_pagesz = wdata->pagesz;
1563         rqst.rq_tailsz = wdata->tailsz;
1564
1565         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1566                  wdata->offset, wdata->bytes);
1567
1568         req->Length = cpu_to_le32(wdata->bytes);
1569
1570         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1571
1572         kref_get(&wdata->refcount);
1573         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1574                                 smb2_writev_callback, wdata, 0);
1575
1576         if (rc) {
1577                 kref_put(&wdata->refcount, cifs_writedata_release);
1578                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1579         }
1580
1581 async_writev_out:
1582         cifs_small_buf_release(req);
1583         return rc;
1584 }
1585
1586 /*
1587  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1588  * The length field from io_parms must be at least 1 and indicates a number of
1589  * elements with data to write that begins with position 1 in iov array. All
1590  * data length is specified by count.
1591  */
1592 int
1593 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1594            unsigned int *nbytes, struct kvec *iov, int n_vec)
1595 {
1596         int rc = 0;
1597         struct smb2_write_req *req = NULL;
1598         struct smb2_write_rsp *rsp = NULL;
1599         int resp_buftype;
1600         *nbytes = 0;
1601
1602         if (n_vec < 1)
1603                 return rc;
1604
1605         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1606         if (rc)
1607                 return rc;
1608
1609         if (io_parms->tcon->ses->server == NULL)
1610                 return -ECONNABORTED;
1611
1612         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1613
1614         req->PersistentFileId = io_parms->persistent_fid;
1615         req->VolatileFileId = io_parms->volatile_fid;
1616         req->WriteChannelInfoOffset = 0;
1617         req->WriteChannelInfoLength = 0;
1618         req->Channel = 0;
1619         req->Length = cpu_to_le32(io_parms->length);
1620         req->Offset = cpu_to_le64(io_parms->offset);
1621         /* 4 for rfc1002 length field */
1622         req->DataOffset = cpu_to_le16(
1623                                 offsetof(struct smb2_write_req, Buffer) - 4);
1624         req->RemainingBytes = 0;
1625
1626         iov[0].iov_base = (char *)req;
1627         /* 4 for rfc1002 length field and 1 for Buffer */
1628         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1629
1630         /* length of entire message including data to be written */
1631         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1632
1633         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1634                           &resp_buftype, 0);
1635         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1636
1637         if (rc) {
1638                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1639                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1640         } else
1641                 *nbytes = le32_to_cpu(rsp->DataLength);
1642
1643         free_rsp_buf(resp_buftype, rsp);
1644         return rc;
1645 }
1646
1647 static unsigned int
1648 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1649 {
1650         int len;
1651         unsigned int entrycount = 0;
1652         unsigned int next_offset = 0;
1653         FILE_DIRECTORY_INFO *entryptr;
1654
1655         if (bufstart == NULL)
1656                 return 0;
1657
1658         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1659
1660         while (1) {
1661                 entryptr = (FILE_DIRECTORY_INFO *)
1662                                         ((char *)entryptr + next_offset);
1663
1664                 if ((char *)entryptr + size > end_of_buf) {
1665                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1666                         break;
1667                 }
1668
1669                 len = le32_to_cpu(entryptr->FileNameLength);
1670                 if ((char *)entryptr + len + size > end_of_buf) {
1671                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1672                                  end_of_buf);
1673                         break;
1674                 }
1675
1676                 *lastentry = (char *)entryptr;
1677                 entrycount++;
1678
1679                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1680                 if (!next_offset)
1681                         break;
1682         }
1683
1684         return entrycount;
1685 }
1686
1687 /*
1688  * Readdir/FindFirst
1689  */
1690 int
1691 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1692                      u64 persistent_fid, u64 volatile_fid, int index,
1693                      struct cifs_search_info *srch_inf)
1694 {
1695         struct smb2_query_directory_req *req;
1696         struct smb2_query_directory_rsp *rsp = NULL;
1697         struct kvec iov[2];
1698         int rc = 0;
1699         int len;
1700         int resp_buftype;
1701         unsigned char *bufptr;
1702         struct TCP_Server_Info *server;
1703         struct cifs_ses *ses = tcon->ses;
1704         __le16 asteriks = cpu_to_le16('*');
1705         char *end_of_smb;
1706         unsigned int output_size = CIFSMaxBufSize;
1707         size_t info_buf_size;
1708
1709         if (ses && (ses->server))
1710                 server = ses->server;
1711         else
1712                 return -EIO;
1713
1714         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1715         if (rc)
1716                 return rc;
1717
1718         switch (srch_inf->info_level) {
1719         case SMB_FIND_FILE_DIRECTORY_INFO:
1720                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1721                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1722                 break;
1723         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1724                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1725                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1726                 break;
1727         default:
1728                 cifs_dbg(VFS, "info level %u isn't supported\n",
1729                          srch_inf->info_level);
1730                 rc = -EINVAL;
1731                 goto qdir_exit;
1732         }
1733
1734         req->FileIndex = cpu_to_le32(index);
1735         req->PersistentFileId = persistent_fid;
1736         req->VolatileFileId = volatile_fid;
1737
1738         len = 0x2;
1739         bufptr = req->Buffer;
1740         memcpy(bufptr, &asteriks, len);
1741
1742         req->FileNameOffset =
1743                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1744         req->FileNameLength = cpu_to_le16(len);
1745         /*
1746          * BB could be 30 bytes or so longer if we used SMB2 specific
1747          * buffer lengths, but this is safe and close enough.
1748          */
1749         output_size = min_t(unsigned int, output_size, server->maxBuf);
1750         output_size = min_t(unsigned int, output_size, 2 << 15);
1751         req->OutputBufferLength = cpu_to_le32(output_size);
1752
1753         iov[0].iov_base = (char *)req;
1754         /* 4 for RFC1001 length and 1 for Buffer */
1755         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1756
1757         iov[1].iov_base = (char *)(req->Buffer);
1758         iov[1].iov_len = len;
1759
1760         inc_rfc1001_len(req, len - 1 /* Buffer */);
1761
1762         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1763         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1764
1765         if (rc) {
1766                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1767                 goto qdir_exit;
1768         }
1769
1770         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1771                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1772                           info_buf_size);
1773         if (rc)
1774                 goto qdir_exit;
1775
1776         srch_inf->unicode = true;
1777
1778         if (srch_inf->ntwrk_buf_start) {
1779                 if (srch_inf->smallBuf)
1780                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1781                 else
1782                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1783         }
1784         srch_inf->ntwrk_buf_start = (char *)rsp;
1785         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1786                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1787         /* 4 for rfc1002 length field */
1788         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1789         srch_inf->entries_in_buffer =
1790                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1791                                     &srch_inf->last_entry, info_buf_size);
1792         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1793         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1794                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1795                  srch_inf->srch_entries_start, srch_inf->last_entry);
1796         if (resp_buftype == CIFS_LARGE_BUFFER)
1797                 srch_inf->smallBuf = false;
1798         else if (resp_buftype == CIFS_SMALL_BUFFER)
1799                 srch_inf->smallBuf = true;
1800         else
1801                 cifs_dbg(VFS, "illegal search buffer type\n");
1802
1803         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1804                 srch_inf->endOfSearch = 1;
1805         else
1806                 srch_inf->endOfSearch = 0;
1807
1808         return rc;
1809
1810 qdir_exit:
1811         free_rsp_buf(resp_buftype, rsp);
1812         return rc;
1813 }
1814
1815 static int
1816 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1817                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1818                unsigned int num, void **data, unsigned int *size)
1819 {
1820         struct smb2_set_info_req *req;
1821         struct smb2_set_info_rsp *rsp = NULL;
1822         struct kvec *iov;
1823         int rc = 0;
1824         int resp_buftype;
1825         unsigned int i;
1826         struct TCP_Server_Info *server;
1827         struct cifs_ses *ses = tcon->ses;
1828
1829         if (ses && (ses->server))
1830                 server = ses->server;
1831         else
1832                 return -EIO;
1833
1834         if (!num)
1835                 return -EINVAL;
1836
1837         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1838         if (!iov)
1839                 return -ENOMEM;
1840
1841         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1842         if (rc) {
1843                 kfree(iov);
1844                 return rc;
1845         }
1846
1847         req->hdr.ProcessId = cpu_to_le32(pid);
1848
1849         req->InfoType = SMB2_O_INFO_FILE;
1850         req->FileInfoClass = info_class;
1851         req->PersistentFileId = persistent_fid;
1852         req->VolatileFileId = volatile_fid;
1853
1854         /* 4 for RFC1001 length and 1 for Buffer */
1855         req->BufferOffset =
1856                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1857         req->BufferLength = cpu_to_le32(*size);
1858
1859         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1860
1861         memcpy(req->Buffer, *data, *size);
1862
1863         iov[0].iov_base = (char *)req;
1864         /* 4 for RFC1001 length */
1865         iov[0].iov_len = get_rfc1002_length(req) + 4;
1866
1867         for (i = 1; i < num; i++) {
1868                 inc_rfc1001_len(req, size[i]);
1869                 le32_add_cpu(&req->BufferLength, size[i]);
1870                 iov[i].iov_base = (char *)data[i];
1871                 iov[i].iov_len = size[i];
1872         }
1873
1874         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1875         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1876
1877         if (rc != 0) {
1878                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1879                 goto out;
1880         }
1881 out:
1882         free_rsp_buf(resp_buftype, rsp);
1883         kfree(iov);
1884         return rc;
1885 }
1886
1887 int
1888 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1889             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1890 {
1891         struct smb2_file_rename_info info;
1892         void **data;
1893         unsigned int size[2];
1894         int rc;
1895         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1896
1897         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1898         if (!data)
1899                 return -ENOMEM;
1900
1901         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1902                               /* 0 = fail if target already exists */
1903         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1904         info.FileNameLength = cpu_to_le32(len);
1905
1906         data[0] = &info;
1907         size[0] = sizeof(struct smb2_file_rename_info);
1908
1909         data[1] = target_file;
1910         size[1] = len + 2 /* null */;
1911
1912         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1913                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1914                            size);
1915         kfree(data);
1916         return rc;
1917 }
1918
1919 int
1920 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1921                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1922 {
1923         struct smb2_file_link_info info;
1924         void **data;
1925         unsigned int size[2];
1926         int rc;
1927         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1928
1929         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1930         if (!data)
1931                 return -ENOMEM;
1932
1933         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1934                               /* 0 = fail if link already exists */
1935         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1936         info.FileNameLength = cpu_to_le32(len);
1937
1938         data[0] = &info;
1939         size[0] = sizeof(struct smb2_file_link_info);
1940
1941         data[1] = target_file;
1942         size[1] = len + 2 /* null */;
1943
1944         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1945                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1946         kfree(data);
1947         return rc;
1948 }
1949
1950 int
1951 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1952              u64 volatile_fid, u32 pid, __le64 *eof)
1953 {
1954         struct smb2_file_eof_info info;
1955         void *data;
1956         unsigned int size;
1957
1958         info.EndOfFile = *eof;
1959
1960         data = &info;
1961         size = sizeof(struct smb2_file_eof_info);
1962
1963         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1964                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1965 }
1966
1967 int
1968 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1969               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
1970 {
1971         unsigned int size;
1972         size = sizeof(FILE_BASIC_INFO);
1973         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
1974                              current->tgid, FILE_BASIC_INFORMATION, 1,
1975                              (void **)&buf, &size);
1976 }
1977
1978 int
1979 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
1980                   const u64 persistent_fid, const u64 volatile_fid,
1981                   __u8 oplock_level)
1982 {
1983         int rc;
1984         struct smb2_oplock_break *req = NULL;
1985
1986         cifs_dbg(FYI, "SMB2_oplock_break\n");
1987         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
1988
1989         if (rc)
1990                 return rc;
1991
1992         req->VolatileFid = volatile_fid;
1993         req->PersistentFid = persistent_fid;
1994         req->OplockLevel = oplock_level;
1995         req->hdr.CreditRequest = cpu_to_le16(1);
1996
1997         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
1998         /* SMB2 buffer freed by function above */
1999
2000         if (rc) {
2001                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2002                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2003         }
2004
2005         return rc;
2006 }
2007
2008 static void
2009 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2010                         struct kstatfs *kst)
2011 {
2012         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2013                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2014         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2015         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2016         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2017         return;
2018 }
2019
2020 static int
2021 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2022                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2023 {
2024         int rc;
2025         struct smb2_query_info_req *req;
2026
2027         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2028
2029         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2030                 return -EIO;
2031
2032         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2033         if (rc)
2034                 return rc;
2035
2036         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2037         req->FileInfoClass = level;
2038         req->PersistentFileId = persistent_fid;
2039         req->VolatileFileId = volatile_fid;
2040         /* 4 for rfc1002 length field and 1 for pad */
2041         req->InputBufferOffset =
2042                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2043         req->OutputBufferLength = cpu_to_le32(
2044                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2045
2046         iov->iov_base = (char *)req;
2047         /* 4 for rfc1002 length field */
2048         iov->iov_len = get_rfc1002_length(req) + 4;
2049         return 0;
2050 }
2051
2052 int
2053 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2054               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2055 {
2056         struct smb2_query_info_rsp *rsp = NULL;
2057         struct kvec iov;
2058         int rc = 0;
2059         int resp_buftype;
2060         struct cifs_ses *ses = tcon->ses;
2061         struct smb2_fs_full_size_info *info = NULL;
2062
2063         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2064                                 sizeof(struct smb2_fs_full_size_info),
2065                                 persistent_fid, volatile_fid);
2066         if (rc)
2067                 return rc;
2068
2069         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2070         if (rc) {
2071                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2072                 goto qinf_exit;
2073         }
2074         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2075
2076         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2077                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2078         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2079                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2080                           sizeof(struct smb2_fs_full_size_info));
2081         if (!rc)
2082                 copy_fs_info_to_kstatfs(info, fsdata);
2083
2084 qinf_exit:
2085         free_rsp_buf(resp_buftype, iov.iov_base);
2086         return rc;
2087 }
2088
2089 int
2090 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2091            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2092            const __u32 num_lock, struct smb2_lock_element *buf)
2093 {
2094         int rc = 0;
2095         struct smb2_lock_req *req = NULL;
2096         struct kvec iov[2];
2097         int resp_buf_type;
2098         unsigned int count;
2099
2100         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2101
2102         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2103         if (rc)
2104                 return rc;
2105
2106         req->hdr.ProcessId = cpu_to_le32(pid);
2107         req->LockCount = cpu_to_le16(num_lock);
2108
2109         req->PersistentFileId = persist_fid;
2110         req->VolatileFileId = volatile_fid;
2111
2112         count = num_lock * sizeof(struct smb2_lock_element);
2113         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2114
2115         iov[0].iov_base = (char *)req;
2116         /* 4 for rfc1002 length field and count for all locks */
2117         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2118         iov[1].iov_base = (char *)buf;
2119         iov[1].iov_len = count;
2120
2121         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2122         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2123         if (rc) {
2124                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2125                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2126         }
2127
2128         return rc;
2129 }
2130
2131 int
2132 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2133           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2134           const __u64 length, const __u64 offset, const __u32 lock_flags,
2135           const bool wait)
2136 {
2137         struct smb2_lock_element lock;
2138
2139         lock.Offset = cpu_to_le64(offset);
2140         lock.Length = cpu_to_le64(length);
2141         lock.Flags = cpu_to_le32(lock_flags);
2142         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2143                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2144
2145         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2146 }
2147
2148 int
2149 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2150                  __u8 *lease_key, const __le32 lease_state)
2151 {
2152         int rc;
2153         struct smb2_lease_ack *req = NULL;
2154
2155         cifs_dbg(FYI, "SMB2_lease_break\n");
2156         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2157
2158         if (rc)
2159                 return rc;
2160
2161         req->hdr.CreditRequest = cpu_to_le16(1);
2162         req->StructureSize = cpu_to_le16(36);
2163         inc_rfc1001_len(req, 12);
2164
2165         memcpy(req->LeaseKey, lease_key, 16);
2166         req->LeaseState = lease_state;
2167
2168         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2169         /* SMB2 buffer freed by function above */
2170
2171         if (rc) {
2172                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2173                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2174         }
2175
2176         return rc;
2177 }