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->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)
 115                 hdr->CreditCharge = cpu_to_le16(1);
 116         /* else CreditCharge MBZ */
 117
 118         hdr->TreeId = tcon->tid;
 119         /* Uid is not converted */
 120         if (tcon->ses)
 121                 hdr->SessionId = tcon->ses->Suid;
 122         /* BB check following DFS flags BB */
 123         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
 124         if (tcon->share_flags & SHI1005_FLAGS_DFS)
 125                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
 126         /* BB how does SMB2 do case sensitive? */
 127         /* if (tcon->nocase)
 128                 hdr->Flags |= SMBFLG_CASELESS; */
 129         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 130                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 131 out:
 132         pdu->StructureSize2 = cpu_to_le16(parmsize);
 133         return;
 134 }
 135
 136 static int
 137 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 138 {
 139         int rc = 0;
 140         struct nls_table *nls_codepage;
 141         struct cifs_ses *ses;
 142         struct TCP_Server_Info *server;
 143
 144         /*
 145          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 146          * check for tcp and smb session status done differently
 147          * for those three - in the calling routine.
 148          */
 149         if (tcon == NULL)
 150                 return rc;
 151
 152         if (smb2_command == SMB2_TREE_CONNECT)
 153                 return rc;
 154
 155         if (tcon->tidStatus == CifsExiting) {
 156                 /*
 157                  * only tree disconnect, open, and write,
 158                  * (and ulogoff which does not have tcon)
 159                  * are allowed as we start force umount.
 160                  */
 161                 if ((smb2_command != SMB2_WRITE) &&
 162                    (smb2_command != SMB2_CREATE) &&
 163                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 164                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 165                                  smb2_command);
 166                         return -ENODEV;
 167                 }
 168         }
 169         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 170             (!tcon->ses->server))
 171                 return -EIO;
 172
 173         ses = tcon->ses;
 174         server = ses->server;
 175
 176         /*
 177          * Give demultiplex thread up to 10 seconds to reconnect, should be
 178          * greater than cifs socket timeout which is 7 seconds
 179          */
 180         while (server->tcpStatus == CifsNeedReconnect) {
 181                 /*
 182                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 183                  * here since they are implicitly done when session drops.
 184                  */
 185                 switch (smb2_command) {
 186                 /*
 187                  * BB Should we keep oplock break and add flush to exceptions?
 188                  */
 189                 case SMB2_TREE_DISCONNECT:
 190                 case SMB2_CANCEL:
 191                 case SMB2_CLOSE:
 192                 case SMB2_OPLOCK_BREAK:
 193                         return -EAGAIN;
 194                 }
 195
 196                 wait_event_interruptible_timeout(server->response_q,
 197                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 198
 199                 /* are we still trying to reconnect? */
 200                 if (server->tcpStatus != CifsNeedReconnect)
 201                         break;
 202
 203                 /*
 204                  * on "soft" mounts we wait once. Hard mounts keep
 205                  * retrying until process is killed or server comes
 206                  * back on-line
 207                  */
 208                 if (!tcon->retry) {
 209                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 210                         return -EHOSTDOWN;
 211                 }
 212         }
 213
 214         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 215                 return rc;
 216
 217         nls_codepage = load_nls_default();
 218
 219         /*
 220          * need to prevent multiple threads trying to simultaneously reconnect
 221          * the same SMB session
 222          */
 223         mutex_lock(&tcon->ses->session_mutex);
 224         rc = cifs_negotiate_protocol(0, tcon->ses);
 225         if (!rc && tcon->ses->need_reconnect)
 226                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 227
 228         if (rc || !tcon->need_reconnect) {
 229                 mutex_unlock(&tcon->ses->session_mutex);
 230                 goto out;
 231         }
 232
 233         cifs_mark_open_files_invalid(tcon);
 234         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 235         mutex_unlock(&tcon->ses->session_mutex);
 236         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 237         if (rc)
 238                 goto out;
 239         atomic_inc(&tconInfoReconnectCount);
 240         /*
 241          * BB FIXME add code to check if wsize needs update due to negotiated
 242          * smb buffer size shrinking.
 243          */
 244 out:
 245         /*
 246          * Check if handle based operation so we know whether we can continue
 247          * or not without returning to caller to reset file handle.
 248          */
 249         /*
 250          * BB Is flush done by server on drop of tcp session? Should we special
 251          * case it and skip above?
 252          */
 253         switch (smb2_command) {
 254         case SMB2_FLUSH:
 255         case SMB2_READ:
 256         case SMB2_WRITE:
 257         case SMB2_LOCK:
 258         case SMB2_IOCTL:
 259         case SMB2_QUERY_DIRECTORY:
 260         case SMB2_CHANGE_NOTIFY:
 261         case SMB2_QUERY_INFO:
 262         case SMB2_SET_INFO:
 263                 return -EAGAIN;
 264         }
 265         unload_nls(nls_codepage);
 266         return rc;
 267 }
 268
 269 /*
 270  * Allocate and return pointer to an SMB request hdr, and set basic
 271  * SMB information in the SMB header. If the return code is zero, this
 272  * function must have filled in request_buf pointer.
 273  */
 274 static int
 275 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 276                 void **request_buf)
 277 {
 278         int rc = 0;
 279
 280         rc = smb2_reconnect(smb2_command, tcon);
 281         if (rc)
 282                 return rc;
 283
 284         /* BB eventually switch this to SMB2 specific small buf size */
 285         *request_buf = cifs_small_buf_get();
 286         if (*request_buf == NULL) {
 287                 /* BB should we add a retry in here if not a writepage? */
 288                 return -ENOMEM;
 289         }
 290
 291         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 292
 293         if (tcon != NULL) {
 294 #ifdef CONFIG_CIFS_STATS2
 295                 uint16_t com_code = le16_to_cpu(smb2_command);
 296                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 297 #endif
 298                 cifs_stats_inc(&tcon->num_smbs_sent);
 299         }
 300
 301         return rc;
 302 }
 303
 304 static void
 305 free_rsp_buf(int resp_buftype, void *rsp)
 306 {
 307         if (resp_buftype == CIFS_SMALL_BUFFER)
 308                 cifs_small_buf_release(rsp);
 309         else if (resp_buftype == CIFS_LARGE_BUFFER)
 310                 cifs_buf_release(rsp);
 311 }
 312
 313
 314 /*
 315  *
 316  *      SMB2 Worker functions follow:
 317  *
 318  *      The general structure of the worker functions is:
 319  *      1) Call smb2_init (assembles SMB2 header)
 320  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 321  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 322  *      4) Decode SMB2 command specific fields in the fixed length area
 323  *      5) Decode variable length data area (if any for this SMB2 command type)
 324  *      6) Call free smb buffer
 325  *      7) return
 326  *
 327  */
 328
 329 int
 330 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 331 {
 332         struct smb2_negotiate_req *req;
 333         struct smb2_negotiate_rsp *rsp;
 334         struct kvec iov[1];
 335         int rc = 0;
 336         int resp_buftype;
 337         struct TCP_Server_Info *server = ses->server;
 338         int blob_offset, blob_length;
 339         char *security_blob;
 340         int flags = CIFS_NEG_OP;
 341
 342         cifs_dbg(FYI, "Negotiate protocol\n");
 343
 344         if (!server) {
 345                 WARN(1, "%s: server is NULL!\n", __func__);
 346                 return -EIO;
 347         }
 348
 349         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 350         if (rc)
 351                 return rc;
 352
 353         req->hdr.SessionId = 0;
 354
 355         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 356
 357         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 358         inc_rfc1001_len(req, 2);
 359
 360         /* only one of SMB2 signing flags may be set in SMB2 request */
 361         if (ses->sign)
 362                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 363         else if (global_secflags & CIFSSEC_MAY_SIGN)
 364                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 365         else
 366                 req->SecurityMode = 0;
 367
 368         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 369
 370         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 371
 372         iov[0].iov_base = (char *)req;
 373         /* 4 for rfc1002 length field */
 374         iov[0].iov_len = get_rfc1002_length(req) + 4;
 375
 376         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 377
 378         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 379         /*
 380          * No tcon so can't do
 381          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 382          */
 383         if (rc != 0)
 384                 goto neg_exit;
 385
 386         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 387
 388         /* BB we may eventually want to match the negotiated vs. requested
 389            dialect, even though we are only requesting one at a time */
 390         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 391                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 392         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 393                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 394         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 395                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 396         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 397                 cifs_dbg(FYI, "negotiated smb3.02 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         u16 blob_length = 0;
 457         char *security_blob;
 458         char *ntlmssp_blob = NULL;
 459         bool use_spnego = false; /* else use raw ntlmssp */
 460
 461         cifs_dbg(FYI, "Session Setup\n");
 462
 463         if (!server) {
 464                 WARN(1, "%s: server is NULL!\n", __func__);
 465                 return -EIO;
 466         }
 467
 468         /*
 469          * If memory allocation is successful, caller of this function
 470          * frees it.
 471          */
 472         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 473         if (!ses->ntlmssp)
 474                 return -ENOMEM;
 475
 476         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 477         ses->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         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 488         req->VcNumber = 0; /* MBZ */
 489         /* to enable echos and oplocks */
 490         req->hdr.CreditRequest = cpu_to_le16(3);
 491
 492         /* only one of SMB2 signing flags may be set in SMB2 request */
 493         if (server->sign)
 494                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 495         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 496                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 497         else
 498                 req->SecurityMode = 0;
 499
 500         req->Capabilities = 0;
 501         req->Channel = 0; /* MBZ */
 502
 503         iov[0].iov_base = (char *)req;
 504         /* 4 for rfc1002 length field and 1 for pad */
 505         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 506         if (phase == NtLmNegotiate) {
 507                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 508                                        GFP_KERNEL);
 509                 if (ntlmssp_blob == NULL) {
 510                         rc = -ENOMEM;
 511                         goto ssetup_exit;
 512                 }
 513                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 514                 if (use_spnego) {
 515                         /* blob_length = build_spnego_ntlmssp_blob(
 516                                         &security_blob,
 517                                         sizeof(struct _NEGOTIATE_MESSAGE),
 518                                         ntlmssp_blob); */
 519                         /* BB eventually need to add this */
 520                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 521                         rc = -EOPNOTSUPP;
 522                         kfree(ntlmssp_blob);
 523                         goto ssetup_exit;
 524                 } else {
 525                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 526                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 527                         security_blob = ntlmssp_blob;
 528                 }
 529         } else if (phase == NtLmAuthenticate) {
 530                 req->hdr.SessionId = ses->Suid;
 531                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 532                                        GFP_KERNEL);
 533                 if (ntlmssp_blob == NULL) {
 534                         rc = -ENOMEM;
 535                         goto ssetup_exit;
 536                 }
 537                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 538                                              nls_cp);
 539                 if (rc) {
 540                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 541                                  rc);
 542                         goto ssetup_exit; /* BB double check error handling */
 543                 }
 544                 if (use_spnego) {
 545                         /* blob_length = build_spnego_ntlmssp_blob(
 546                                                         &security_blob,
 547                                                         blob_length,
 548                                                         ntlmssp_blob); */
 549                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 550                         rc = -EOPNOTSUPP;
 551                         kfree(ntlmssp_blob);
 552                         goto ssetup_exit;
 553                 } else {
 554                         security_blob = ntlmssp_blob;
 555                 }
 556         } else {
 557                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 558                 rc = -EIO;
 559                 goto ssetup_exit;
 560         }
 561
 562         /* Testing shows that buffer offset must be at location of Buffer[0] */
 563         req->SecurityBufferOffset =
 564                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 565                                             1 /* pad */ - 4 /* rfc1001 len */);
 566         req->SecurityBufferLength = cpu_to_le16(blob_length);
 567         iov[1].iov_base = security_blob;
 568         iov[1].iov_len = blob_length;
 569
 570         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 571
 572         /* BB add code to build os and lm fields */
 573
 574         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 575                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 576
 577         kfree(security_blob);
 578         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 579         if (resp_buftype != CIFS_NO_BUFFER &&
 580             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 581                 if (phase != NtLmNegotiate) {
 582                         cifs_dbg(VFS, "Unexpected more processing error\n");
 583                         goto ssetup_exit;
 584                 }
 585                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 586                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 587                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 588                                  le16_to_cpu(rsp->SecurityBufferOffset));
 589                         rc = -EIO;
 590                         goto ssetup_exit;
 591                 }
 592
 593                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 594                 phase = NtLmChallenge; /* process ntlmssp challenge */
 595                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 596                 ses->Suid = rsp->hdr.SessionId;
 597                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 598                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 599         }
 600
 601         /*
 602          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 603          * but at least the raw NTLMSSP case works.
 604          */
 605         /*
 606          * No tcon so can't do
 607          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 608          */
 609         if (rc != 0)
 610                 goto ssetup_exit;
 611
 612         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 613 ssetup_exit:
 614         free_rsp_buf(resp_buftype, rsp);
 615
 616         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 617         if ((phase == NtLmChallenge) && (rc == 0))
 618                 goto ssetup_ntlmssp_authenticate;
 619         return rc;
 620 }
 621
 622 int
 623 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 624 {
 625         struct smb2_logoff_req *req; /* response is also trivial struct */
 626         int rc = 0;
 627         struct TCP_Server_Info *server;
 628
 629         cifs_dbg(FYI, "disconnect session %p\n", ses);
 630
 631         if (ses && (ses->server))
 632                 server = ses->server;
 633         else
 634                 return -EIO;
 635
 636         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 637         if (rc)
 638                 return rc;
 639
 640          /* since no tcon, smb2_init can not do this, so do here */
 641         req->hdr.SessionId = ses->Suid;
 642         if (server->sign)
 643                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 644
 645         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 646         /*
 647          * No tcon so can't do
 648          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 649          */
 650         return rc;
 651 }
 652
 653 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 654 {
 655         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 656 }
 657
 658 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 659
 660 int
 661 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 662           struct cifs_tcon *tcon, const struct nls_table *cp)
 663 {
 664         struct smb2_tree_connect_req *req;
 665         struct smb2_tree_connect_rsp *rsp = NULL;
 666         struct kvec iov[2];
 667         int rc = 0;
 668         int resp_buftype;
 669         int unc_path_len;
 670         struct TCP_Server_Info *server;
 671         __le16 *unc_path = NULL;
 672
 673         cifs_dbg(FYI, "TCON\n");
 674
 675         if ((ses->server) && tree)
 676                 server = ses->server;
 677         else
 678                 return -EIO;
 679
 680         if (tcon && tcon->bad_network_name)
 681                 return -ENOENT;
 682
 683         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 684         if (unc_path == NULL)
 685                 return -ENOMEM;
 686
 687         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 688         unc_path_len *= 2;
 689         if (unc_path_len < 2) {
 690                 kfree(unc_path);
 691                 return -EINVAL;
 692         }
 693
 694         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 695         if (rc) {
 696                 kfree(unc_path);
 697                 return rc;
 698         }
 699
 700         if (tcon == NULL) {
 701                 /* since no tcon, smb2_init can not do this, so do here */
 702                 req->hdr.SessionId = ses->Suid;
 703                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 704                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 705         }
 706
 707         iov[0].iov_base = (char *)req;
 708         /* 4 for rfc1002 length field and 1 for pad */
 709         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 710
 711         /* Testing shows that buffer offset must be at location of Buffer[0] */
 712         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 713                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 714         req->PathLength = cpu_to_le16(unc_path_len - 2);
 715         iov[1].iov_base = unc_path;
 716         iov[1].iov_len = unc_path_len;
 717
 718         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 719
 720         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 721         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 722
 723         if (rc != 0) {
 724                 if (tcon) {
 725                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 726                         tcon->need_reconnect = true;
 727                 }
 728                 goto tcon_error_exit;
 729         }
 730
 731         if (tcon == NULL) {
 732                 ses->ipc_tid = rsp->hdr.TreeId;
 733                 goto tcon_exit;
 734         }
 735
 736         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 737                 cifs_dbg(FYI, "connection to disk share\n");
 738         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 739                 tcon->ipc = true;
 740                 cifs_dbg(FYI, "connection to pipe share\n");
 741         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 742                 tcon->print = true;
 743                 cifs_dbg(FYI, "connection to printer\n");
 744         } else {
 745                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 746                 rc = -EOPNOTSUPP;
 747                 goto tcon_error_exit;
 748         }
 749
 750         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 751         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 752         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 753         tcon->tidStatus = CifsGood;
 754         tcon->need_reconnect = false;
 755         tcon->tid = rsp->hdr.TreeId;
 756         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 757
 758         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 759             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 760                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 761
 762 tcon_exit:
 763         free_rsp_buf(resp_buftype, rsp);
 764         kfree(unc_path);
 765         return rc;
 766
 767 tcon_error_exit:
 768         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 769                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 770                 tcon->bad_network_name = true;
 771         }
 772         goto tcon_exit;
 773 }
 774
 775 int
 776 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 777 {
 778         struct smb2_tree_disconnect_req *req; /* response is trivial */
 779         int rc = 0;
 780         struct TCP_Server_Info *server;
 781         struct cifs_ses *ses = tcon->ses;
 782
 783         cifs_dbg(FYI, "Tree Disconnect\n");
 784
 785         if (ses && (ses->server))
 786                 server = ses->server;
 787         else
 788                 return -EIO;
 789
 790         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 791                 return 0;
 792
 793         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 794         if (rc)
 795                 return rc;
 796
 797         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 798         if (rc)
 799                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 800
 801         return rc;
 802 }
 803
 804 static struct create_lease *
 805 create_lease_buf(u8 *lease_key, u8 oplock)
 806 {
 807         struct create_lease *buf;
 808
 809         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 810         if (!buf)
 811                 return NULL;
 812
 813         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 814         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 815         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 816                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 817                                            SMB2_LEASE_READ_CACHING;
 818         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 819                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 820         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 821                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 822                                            SMB2_LEASE_READ_CACHING |
 823                                            SMB2_LEASE_WRITE_CACHING;
 824
 825         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 826                                         (struct create_lease, lcontext));
 827         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 828         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 829                                 (struct create_lease, Name));
 830         buf->ccontext.NameLength = cpu_to_le16(4);
 831         buf->Name[0] = 'R';
 832         buf->Name[1] = 'q';
 833         buf->Name[2] = 'L';
 834         buf->Name[3] = 's';
 835         return buf;
 836 }
 837
 838 static __u8
 839 parse_lease_state(struct smb2_create_rsp *rsp)
 840 {
 841         char *data_offset;
 842         struct create_lease *lc;
 843         bool found = false;
 844
 845         data_offset = (char *)rsp;
 846         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 847         lc = (struct create_lease *)data_offset;
 848         do {
 849                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 850                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 851                     strncmp(name, "RqLs", 4)) {
 852                         lc = (struct create_lease *)((char *)lc
 853                                         + le32_to_cpu(lc->ccontext.Next));
 854                         continue;
 855                 }
 856                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 857                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 858                 found = true;
 859                 break;
 860         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 861
 862         if (!found)
 863                 return 0;
 864
 865         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 866 }
 867
 868 int
 869 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 870           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 871           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 872           __u8 *oplock, struct smb2_file_all_info *buf)
 873 {
 874         struct smb2_create_req *req;
 875         struct smb2_create_rsp *rsp;
 876         struct TCP_Server_Info *server;
 877         struct cifs_ses *ses = tcon->ses;
 878         struct kvec iov[3];
 879         int resp_buftype;
 880         int uni_path_len;
 881         __le16 *copy_path = NULL;
 882         int copy_size;
 883         int rc = 0;
 884         int num_iovecs = 2;
 885
 886         cifs_dbg(FYI, "create/open\n");
 887
 888         if (ses && (ses->server))
 889                 server = ses->server;
 890         else
 891                 return -EIO;
 892
 893         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 894         if (rc)
 895                 return rc;
 896
 897         req->ImpersonationLevel = IL_IMPERSONATION;
 898         req->DesiredAccess = cpu_to_le32(desired_access);
 899         /* File attributes ignored on open (used in create though) */
 900         req->FileAttributes = cpu_to_le32(file_attributes);
 901         req->ShareAccess = FILE_SHARE_ALL_LE;
 902         req->CreateDisposition = cpu_to_le32(create_disposition);
 903         req->CreateOptions = cpu_to_le32(create_options);
 904         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 905         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 906                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 907
 908         iov[0].iov_base = (char *)req;
 909         /* 4 for rfc1002 length field */
 910         iov[0].iov_len = get_rfc1002_length(req) + 4;
 911
 912         /* MUST set path len (NameLength) to 0 opening root of share */
 913         if (uni_path_len >= 4) {
 914                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 915                 /* -1 since last byte is buf[0] which is sent below (path) */
 916                 iov[0].iov_len--;
 917                 if (uni_path_len % 8 != 0) {
 918                         copy_size = uni_path_len / 8 * 8;
 919                         if (copy_size < uni_path_len)
 920                                 copy_size += 8;
 921
 922                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 923                         if (!copy_path)
 924                                 return -ENOMEM;
 925                         memcpy((char *)copy_path, (const char *)path,
 926                                 uni_path_len);
 927                         uni_path_len = copy_size;
 928                         path = copy_path;
 929                 }
 930
 931                 iov[1].iov_len = uni_path_len;
 932                 iov[1].iov_base = path;
 933                 /*
 934                  * -1 since last byte is buf[0] which was counted in
 935                  * smb2_buf_len.
 936                  */
 937                 inc_rfc1001_len(req, uni_path_len - 1);
 938         } else {
 939                 iov[0].iov_len += 7;
 940                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 941                                 req->hdr.smb2_buf_length) + 8 - 1);
 942                 num_iovecs = 1;
 943                 req->NameLength = 0;
 944         }
 945
 946         if (!server->oplocks)
 947                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 948
 949         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 950             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 951                 req->RequestedOplockLevel = *oplock;
 952         else {
 953                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 954                 if (iov[num_iovecs].iov_base == NULL) {
 955                         cifs_small_buf_release(req);
 956                         kfree(copy_path);
 957                         return -ENOMEM;
 958                 }
 959                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
 960                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 961                 req->CreateContextsOffset = cpu_to_le32(
 962                         sizeof(struct smb2_create_req) - 4 - 8 +
 963                         iov[num_iovecs-1].iov_len);
 964                 req->CreateContextsLength = cpu_to_le32(
 965                         sizeof(struct create_lease));
 966                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 967                 num_iovecs++;
 968         }
 969
 970         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 971         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 972
 973         if (rc != 0) {
 974                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 975                 goto creat_exit;
 976         }
 977
 978         *persistent_fid = rsp->PersistentFileId;
 979         *volatile_fid = rsp->VolatileFileId;
 980
 981         if (buf) {
 982                 memcpy(buf, &rsp->CreationTime, 32);
 983                 buf->AllocationSize = rsp->AllocationSize;
 984                 buf->EndOfFile = rsp->EndofFile;
 985                 buf->Attributes = rsp->FileAttributes;
 986                 buf->NumberOfLinks = cpu_to_le32(1);
 987                 buf->DeletePending = 0;
 988         }
 989
 990         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
 991                 *oplock = parse_lease_state(rsp);
 992         else
 993                 *oplock = rsp->OplockLevel;
 994 creat_exit:
 995         kfree(copy_path);
 996         free_rsp_buf(resp_buftype, rsp);
 997         return rc;
 998 }
 999
1000 int
1001 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1002            u64 persistent_fid, u64 volatile_fid)
1003 {
1004         struct smb2_close_req *req;
1005         struct smb2_close_rsp *rsp;
1006         struct TCP_Server_Info *server;
1007         struct cifs_ses *ses = tcon->ses;
1008         struct kvec iov[1];
1009         int resp_buftype;
1010         int rc = 0;
1011
1012         cifs_dbg(FYI, "Close\n");
1013
1014         if (ses && (ses->server))
1015                 server = ses->server;
1016         else
1017                 return -EIO;
1018
1019         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1020         if (rc)
1021                 return rc;
1022
1023         req->PersistentFileId = persistent_fid;
1024         req->VolatileFileId = volatile_fid;
1025
1026         iov[0].iov_base = (char *)req;
1027         /* 4 for rfc1002 length field */
1028         iov[0].iov_len = get_rfc1002_length(req) + 4;
1029
1030         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1031         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1032
1033         if (rc != 0) {
1034                 if (tcon)
1035                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1036                 goto close_exit;
1037         }
1038
1039         /* BB FIXME - decode close response, update inode for caching */
1040
1041 close_exit:
1042         free_rsp_buf(resp_buftype, rsp);
1043         return rc;
1044 }
1045
1046 static int
1047 validate_buf(unsigned int offset, unsigned int buffer_length,
1048              struct smb2_hdr *hdr, unsigned int min_buf_size)
1049
1050 {
1051         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1052         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1053         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1054         char *end_of_buf = begin_of_buf + buffer_length;
1055
1056
1057         if (buffer_length < min_buf_size) {
1058                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1059                          buffer_length, min_buf_size);
1060                 return -EINVAL;
1061         }
1062
1063         /* check if beyond RFC1001 maximum length */
1064         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1065                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1066                          buffer_length, smb_len);
1067                 return -EINVAL;
1068         }
1069
1070         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1071                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1072                 return -EINVAL;
1073         }
1074
1075         return 0;
1076 }
1077
1078 /*
1079  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1080  * Caller must free buffer.
1081  */
1082 static int
1083 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1084                       struct smb2_hdr *hdr, unsigned int minbufsize,
1085                       char *data)
1086
1087 {
1088         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1089         int rc;
1090
1091         if (!data)
1092                 return -EINVAL;
1093
1094         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1095         if (rc)
1096                 return rc;
1097
1098         memcpy(data, begin_of_buf, buffer_length);
1099
1100         return 0;
1101 }
1102
1103 static int
1104 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1105            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1106            size_t output_len, size_t min_len, void *data)
1107 {
1108         struct smb2_query_info_req *req;
1109         struct smb2_query_info_rsp *rsp = NULL;
1110         struct kvec iov[2];
1111         int rc = 0;
1112         int resp_buftype;
1113         struct TCP_Server_Info *server;
1114         struct cifs_ses *ses = tcon->ses;
1115
1116         cifs_dbg(FYI, "Query Info\n");
1117
1118         if (ses && (ses->server))
1119                 server = ses->server;
1120         else
1121                 return -EIO;
1122
1123         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1124         if (rc)
1125                 return rc;
1126
1127         req->InfoType = SMB2_O_INFO_FILE;
1128         req->FileInfoClass = info_class;
1129         req->PersistentFileId = persistent_fid;
1130         req->VolatileFileId = volatile_fid;
1131         /* 4 for rfc1002 length field and 1 for Buffer */
1132         req->InputBufferOffset =
1133                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1134         req->OutputBufferLength = cpu_to_le32(output_len);
1135
1136         iov[0].iov_base = (char *)req;
1137         /* 4 for rfc1002 length field */
1138         iov[0].iov_len = get_rfc1002_length(req) + 4;
1139
1140         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1141         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1142
1143         if (rc) {
1144                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1145                 goto qinf_exit;
1146         }
1147
1148         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1149                                    le32_to_cpu(rsp->OutputBufferLength),
1150                                    &rsp->hdr, min_len, data);
1151
1152 qinf_exit:
1153         free_rsp_buf(resp_buftype, rsp);
1154         return rc;
1155 }
1156
1157 int
1158 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1159                 u64 persistent_fid, u64 volatile_fid,
1160                 struct smb2_file_all_info *data)
1161 {
1162         return query_info(xid, tcon, persistent_fid, volatile_fid,
1163                           FILE_ALL_INFORMATION,
1164                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1165                           sizeof(struct smb2_file_all_info), data);
1166 }
1167
1168 int
1169 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1170                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1171 {
1172         return query_info(xid, tcon, persistent_fid, volatile_fid,
1173                           FILE_INTERNAL_INFORMATION,
1174                           sizeof(struct smb2_file_internal_info),
1175                           sizeof(struct smb2_file_internal_info), uniqueid);
1176 }
1177
1178 /*
1179  * This is a no-op for now. We're not really interested in the reply, but
1180  * rather in the fact that the server sent one and that server->lstrp
1181  * gets updated.
1182  *
1183  * FIXME: maybe we should consider checking that the reply matches request?
1184  */
1185 static void
1186 smb2_echo_callback(struct mid_q_entry *mid)
1187 {
1188         struct TCP_Server_Info *server = mid->callback_data;
1189         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1190         unsigned int credits_received = 1;
1191
1192         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1193                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1194
1195         DeleteMidQEntry(mid);
1196         add_credits(server, credits_received, CIFS_ECHO_OP);
1197 }
1198
1199 int
1200 SMB2_echo(struct TCP_Server_Info *server)
1201 {
1202         struct smb2_echo_req *req;
1203         int rc = 0;
1204         struct kvec iov;
1205         struct smb_rqst rqst = { .rq_iov = &iov,
1206                                  .rq_nvec = 1 };
1207
1208         cifs_dbg(FYI, "In echo request\n");
1209
1210         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1211         if (rc)
1212                 return rc;
1213
1214         req->hdr.CreditRequest = cpu_to_le16(1);
1215
1216         iov.iov_base = (char *)req;
1217         /* 4 for rfc1002 length field */
1218         iov.iov_len = get_rfc1002_length(req) + 4;
1219
1220         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1221                              CIFS_ECHO_OP);
1222         if (rc)
1223                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1224
1225         cifs_small_buf_release(req);
1226         return rc;
1227 }
1228
1229 int
1230 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1231            u64 volatile_fid)
1232 {
1233         struct smb2_flush_req *req;
1234         struct TCP_Server_Info *server;
1235         struct cifs_ses *ses = tcon->ses;
1236         struct kvec iov[1];
1237         int resp_buftype;
1238         int rc = 0;
1239
1240         cifs_dbg(FYI, "Flush\n");
1241
1242         if (ses && (ses->server))
1243                 server = ses->server;
1244         else
1245                 return -EIO;
1246
1247         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1248         if (rc)
1249                 return rc;
1250
1251         req->PersistentFileId = persistent_fid;
1252         req->VolatileFileId = volatile_fid;
1253
1254         iov[0].iov_base = (char *)req;
1255         /* 4 for rfc1002 length field */
1256         iov[0].iov_len = get_rfc1002_length(req) + 4;
1257
1258         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1259
1260         if ((rc != 0) && tcon)
1261                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1262
1263         free_rsp_buf(resp_buftype, iov[0].iov_base);
1264         return rc;
1265 }
1266
1267 /*
1268  * To form a chain of read requests, any read requests after the first should
1269  * have the end_of_chain boolean set to true.
1270  */
1271 static int
1272 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1273                   unsigned int remaining_bytes, int request_type)
1274 {
1275         int rc = -EACCES;
1276         struct smb2_read_req *req = NULL;
1277
1278         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1279         if (rc)
1280                 return rc;
1281         if (io_parms->tcon->ses->server == NULL)
1282                 return -ECONNABORTED;
1283
1284         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1285
1286         req->PersistentFileId = io_parms->persistent_fid;
1287         req->VolatileFileId = io_parms->volatile_fid;
1288         req->ReadChannelInfoOffset = 0; /* reserved */
1289         req->ReadChannelInfoLength = 0; /* reserved */
1290         req->Channel = 0; /* reserved */
1291         req->MinimumCount = 0;
1292         req->Length = cpu_to_le32(io_parms->length);
1293         req->Offset = cpu_to_le64(io_parms->offset);
1294
1295         if (request_type & CHAINED_REQUEST) {
1296                 if (!(request_type & END_OF_CHAIN)) {
1297                         /* 4 for rfc1002 length field */
1298                         req->hdr.NextCommand =
1299                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1300                 } else /* END_OF_CHAIN */
1301                         req->hdr.NextCommand = 0;
1302                 if (request_type & RELATED_REQUEST) {
1303                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1304                         /*
1305                          * Related requests use info from previous read request
1306                          * in chain.
1307                          */
1308                         req->hdr.SessionId = 0xFFFFFFFF;
1309                         req->hdr.TreeId = 0xFFFFFFFF;
1310                         req->PersistentFileId = 0xFFFFFFFF;
1311                         req->VolatileFileId = 0xFFFFFFFF;
1312                 }
1313         }
1314         if (remaining_bytes > io_parms->length)
1315                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1316         else
1317                 req->RemainingBytes = 0;
1318
1319         iov[0].iov_base = (char *)req;
1320         /* 4 for rfc1002 length field */
1321         iov[0].iov_len = get_rfc1002_length(req) + 4;
1322         return rc;
1323 }
1324
1325 static void
1326 smb2_readv_callback(struct mid_q_entry *mid)
1327 {
1328         struct cifs_readdata *rdata = mid->callback_data;
1329         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1330         struct TCP_Server_Info *server = tcon->ses->server;
1331         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1332         unsigned int credits_received = 1;
1333         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1334                                  .rq_nvec = 1,
1335                                  .rq_pages = rdata->pages,
1336                                  .rq_npages = rdata->nr_pages,
1337                                  .rq_pagesz = rdata->pagesz,
1338                                  .rq_tailsz = rdata->tailsz };
1339
1340         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1341                  __func__, mid->mid, mid->mid_state, rdata->result,
1342                  rdata->bytes);
1343
1344         switch (mid->mid_state) {
1345         case MID_RESPONSE_RECEIVED:
1346                 credits_received = le16_to_cpu(buf->CreditRequest);
1347                 /* result already set, check signature */
1348                 if (server->sign) {
1349                         int rc;
1350
1351                         rc = smb2_verify_signature(&rqst, server);
1352                         if (rc)
1353                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1354                                          rc);
1355                 }
1356                 /* FIXME: should this be counted toward the initiating task? */
1357                 task_io_account_read(rdata->bytes);
1358                 cifs_stats_bytes_read(tcon, rdata->bytes);
1359                 break;
1360         case MID_REQUEST_SUBMITTED:
1361         case MID_RETRY_NEEDED:
1362                 rdata->result = -EAGAIN;
1363                 break;
1364         default:
1365                 if (rdata->result != -ENODATA)
1366                         rdata->result = -EIO;
1367         }
1368
1369         if (rdata->result)
1370                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1371
1372         queue_work(cifsiod_wq, &rdata->work);
1373         DeleteMidQEntry(mid);
1374         add_credits(server, credits_received, 0);
1375 }
1376
1377 /* smb2_async_readv - send an async write, and set up mid to handle result */
1378 int
1379 smb2_async_readv(struct cifs_readdata *rdata)
1380 {
1381         int rc;
1382         struct smb2_hdr *buf;
1383         struct cifs_io_parms io_parms;
1384         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1385                                  .rq_nvec = 1 };
1386
1387         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1388                  __func__, rdata->offset, rdata->bytes);
1389
1390         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1391         io_parms.offset = rdata->offset;
1392         io_parms.length = rdata->bytes;
1393         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1394         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1395         io_parms.pid = rdata->pid;
1396         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1397         if (rc)
1398                 return rc;
1399
1400         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1401         /* 4 for rfc1002 length field */
1402         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1403
1404         kref_get(&rdata->refcount);
1405         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1406                              cifs_readv_receive, smb2_readv_callback,
1407                              rdata, 0);
1408         if (rc) {
1409                 kref_put(&rdata->refcount, cifs_readdata_release);
1410                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1411         }
1412
1413         cifs_small_buf_release(buf);
1414         return rc;
1415 }
1416
1417 int
1418 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1419           unsigned int *nbytes, char **buf, int *buf_type)
1420 {
1421         int resp_buftype, rc = -EACCES;
1422         struct smb2_read_rsp *rsp = NULL;
1423         struct kvec iov[1];
1424
1425         *nbytes = 0;
1426         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1427         if (rc)
1428                 return rc;
1429
1430         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1431                           &resp_buftype, CIFS_LOG_ERROR);
1432
1433         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1434
1435         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1436                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1437                 return 0;
1438         }
1439
1440         if (rc) {
1441                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1442                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1443         } else {
1444                 *nbytes = le32_to_cpu(rsp->DataLength);
1445                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1446                     (*nbytes > io_parms->length)) {
1447                         cifs_dbg(FYI, "bad length %d for count %d\n",
1448                                  *nbytes, io_parms->length);
1449                         rc = -EIO;
1450                         *nbytes = 0;
1451                 }
1452         }
1453
1454         if (*buf) {
1455                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1456                        *nbytes);
1457                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1458         } else if (resp_buftype != CIFS_NO_BUFFER) {
1459                 *buf = iov[0].iov_base;
1460                 if (resp_buftype == CIFS_SMALL_BUFFER)
1461                         *buf_type = CIFS_SMALL_BUFFER;
1462                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1463                         *buf_type = CIFS_LARGE_BUFFER;
1464         }
1465         return rc;
1466 }
1467
1468 /*
1469  * Check the mid_state and signature on received buffer (if any), and queue the
1470  * workqueue completion task.
1471  */
1472 static void
1473 smb2_writev_callback(struct mid_q_entry *mid)
1474 {
1475         struct cifs_writedata *wdata = mid->callback_data;
1476         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1477         unsigned int written;
1478         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1479         unsigned int credits_received = 1;
1480
1481         switch (mid->mid_state) {
1482         case MID_RESPONSE_RECEIVED:
1483                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1484                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1485                 if (wdata->result != 0)
1486                         break;
1487
1488                 written = le32_to_cpu(rsp->DataLength);
1489                 /*
1490                  * Mask off high 16 bits when bytes written as returned
1491                  * by the server is greater than bytes requested by the
1492                  * client. OS/2 servers are known to set incorrect
1493                  * CountHigh values.
1494                  */
1495                 if (written > wdata->bytes)
1496                         written &= 0xFFFF;
1497
1498                 if (written < wdata->bytes)
1499                         wdata->result = -ENOSPC;
1500                 else
1501                         wdata->bytes = written;
1502                 break;
1503         case MID_REQUEST_SUBMITTED:
1504         case MID_RETRY_NEEDED:
1505                 wdata->result = -EAGAIN;
1506                 break;
1507         default:
1508                 wdata->result = -EIO;
1509                 break;
1510         }
1511
1512         if (wdata->result)
1513                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1514
1515         queue_work(cifsiod_wq, &wdata->work);
1516         DeleteMidQEntry(mid);
1517         add_credits(tcon->ses->server, credits_received, 0);
1518 }
1519
1520 /* smb2_async_writev - send an async write, and set up mid to handle result */
1521 int
1522 smb2_async_writev(struct cifs_writedata *wdata)
1523 {
1524         int rc = -EACCES;
1525         struct smb2_write_req *req = NULL;
1526         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1527         struct kvec iov;
1528         struct smb_rqst rqst;
1529
1530         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1531         if (rc)
1532                 goto async_writev_out;
1533
1534         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1535
1536         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1537         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1538         req->WriteChannelInfoOffset = 0;
1539         req->WriteChannelInfoLength = 0;
1540         req->Channel = 0;
1541         req->Offset = cpu_to_le64(wdata->offset);
1542         /* 4 for rfc1002 length field */
1543         req->DataOffset = cpu_to_le16(
1544                                 offsetof(struct smb2_write_req, Buffer) - 4);
1545         req->RemainingBytes = 0;
1546
1547         /* 4 for rfc1002 length field and 1 for Buffer */
1548         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1549         iov.iov_base = req;
1550
1551         rqst.rq_iov = &iov;
1552         rqst.rq_nvec = 1;
1553         rqst.rq_pages = wdata->pages;
1554         rqst.rq_npages = wdata->nr_pages;
1555         rqst.rq_pagesz = wdata->pagesz;
1556         rqst.rq_tailsz = wdata->tailsz;
1557
1558         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1559                  wdata->offset, wdata->bytes);
1560
1561         req->Length = cpu_to_le32(wdata->bytes);
1562
1563         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1564
1565         kref_get(&wdata->refcount);
1566         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1567                                 smb2_writev_callback, wdata, 0);
1568
1569         if (rc) {
1570                 kref_put(&wdata->refcount, cifs_writedata_release);
1571                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1572         }
1573
1574 async_writev_out:
1575         cifs_small_buf_release(req);
1576         return rc;
1577 }
1578
1579 /*
1580  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1581  * The length field from io_parms must be at least 1 and indicates a number of
1582  * elements with data to write that begins with position 1 in iov array. All
1583  * data length is specified by count.
1584  */
1585 int
1586 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1587            unsigned int *nbytes, struct kvec *iov, int n_vec)
1588 {
1589         int rc = 0;
1590         struct smb2_write_req *req = NULL;
1591         struct smb2_write_rsp *rsp = NULL;
1592         int resp_buftype;
1593         *nbytes = 0;
1594
1595         if (n_vec < 1)
1596                 return rc;
1597
1598         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1599         if (rc)
1600                 return rc;
1601
1602         if (io_parms->tcon->ses->server == NULL)
1603                 return -ECONNABORTED;
1604
1605         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1606
1607         req->PersistentFileId = io_parms->persistent_fid;
1608         req->VolatileFileId = io_parms->volatile_fid;
1609         req->WriteChannelInfoOffset = 0;
1610         req->WriteChannelInfoLength = 0;
1611         req->Channel = 0;
1612         req->Length = cpu_to_le32(io_parms->length);
1613         req->Offset = cpu_to_le64(io_parms->offset);
1614         /* 4 for rfc1002 length field */
1615         req->DataOffset = cpu_to_le16(
1616                                 offsetof(struct smb2_write_req, Buffer) - 4);
1617         req->RemainingBytes = 0;
1618
1619         iov[0].iov_base = (char *)req;
1620         /* 4 for rfc1002 length field and 1 for Buffer */
1621         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1622
1623         /* length of entire message including data to be written */
1624         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1625
1626         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1627                           &resp_buftype, 0);
1628         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1629
1630         if (rc) {
1631                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1632                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1633         } else
1634                 *nbytes = le32_to_cpu(rsp->DataLength);
1635
1636         free_rsp_buf(resp_buftype, rsp);
1637         return rc;
1638 }
1639
1640 static unsigned int
1641 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1642 {
1643         int len;
1644         unsigned int entrycount = 0;
1645         unsigned int next_offset = 0;
1646         FILE_DIRECTORY_INFO *entryptr;
1647
1648         if (bufstart == NULL)
1649                 return 0;
1650
1651         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1652
1653         while (1) {
1654                 entryptr = (FILE_DIRECTORY_INFO *)
1655                                         ((char *)entryptr + next_offset);
1656
1657                 if ((char *)entryptr + size > end_of_buf) {
1658                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1659                         break;
1660                 }
1661
1662                 len = le32_to_cpu(entryptr->FileNameLength);
1663                 if ((char *)entryptr + len + size > end_of_buf) {
1664                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1665                                  end_of_buf);
1666                         break;
1667                 }
1668
1669                 *lastentry = (char *)entryptr;
1670                 entrycount++;
1671
1672                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1673                 if (!next_offset)
1674                         break;
1675         }
1676
1677         return entrycount;
1678 }
1679
1680 /*
1681  * Readdir/FindFirst
1682  */
1683 int
1684 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1685                      u64 persistent_fid, u64 volatile_fid, int index,
1686                      struct cifs_search_info *srch_inf)
1687 {
1688         struct smb2_query_directory_req *req;
1689         struct smb2_query_directory_rsp *rsp = NULL;
1690         struct kvec iov[2];
1691         int rc = 0;
1692         int len;
1693         int resp_buftype;
1694         unsigned char *bufptr;
1695         struct TCP_Server_Info *server;
1696         struct cifs_ses *ses = tcon->ses;
1697         __le16 asteriks = cpu_to_le16('*');
1698         char *end_of_smb;
1699         unsigned int output_size = CIFSMaxBufSize;
1700         size_t info_buf_size;
1701
1702         if (ses && (ses->server))
1703                 server = ses->server;
1704         else
1705                 return -EIO;
1706
1707         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1708         if (rc)
1709                 return rc;
1710
1711         switch (srch_inf->info_level) {
1712         case SMB_FIND_FILE_DIRECTORY_INFO:
1713                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1714                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1715                 break;
1716         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1717                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1718                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1719                 break;
1720         default:
1721                 cifs_dbg(VFS, "info level %u isn't supported\n",
1722                          srch_inf->info_level);
1723                 rc = -EINVAL;
1724                 goto qdir_exit;
1725         }
1726
1727         req->FileIndex = cpu_to_le32(index);
1728         req->PersistentFileId = persistent_fid;
1729         req->VolatileFileId = volatile_fid;
1730
1731         len = 0x2;
1732         bufptr = req->Buffer;
1733         memcpy(bufptr, &asteriks, len);
1734
1735         req->FileNameOffset =
1736                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1737         req->FileNameLength = cpu_to_le16(len);
1738         /*
1739          * BB could be 30 bytes or so longer if we used SMB2 specific
1740          * buffer lengths, but this is safe and close enough.
1741          */
1742         output_size = min_t(unsigned int, output_size, server->maxBuf);
1743         output_size = min_t(unsigned int, output_size, 2 << 15);
1744         req->OutputBufferLength = cpu_to_le32(output_size);
1745
1746         iov[0].iov_base = (char *)req;
1747         /* 4 for RFC1001 length and 1 for Buffer */
1748         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1749
1750         iov[1].iov_base = (char *)(req->Buffer);
1751         iov[1].iov_len = len;
1752
1753         inc_rfc1001_len(req, len - 1 /* Buffer */);
1754
1755         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1756         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1757
1758         if (rc) {
1759                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1760                 goto qdir_exit;
1761         }
1762
1763         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1764                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1765                           info_buf_size);
1766         if (rc)
1767                 goto qdir_exit;
1768
1769         srch_inf->unicode = true;
1770
1771         if (srch_inf->ntwrk_buf_start) {
1772                 if (srch_inf->smallBuf)
1773                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1774                 else
1775                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1776         }
1777         srch_inf->ntwrk_buf_start = (char *)rsp;
1778         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1779                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1780         /* 4 for rfc1002 length field */
1781         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1782         srch_inf->entries_in_buffer =
1783                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1784                                     &srch_inf->last_entry, info_buf_size);
1785         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1786         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1787                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1788                  srch_inf->srch_entries_start, srch_inf->last_entry);
1789         if (resp_buftype == CIFS_LARGE_BUFFER)
1790                 srch_inf->smallBuf = false;
1791         else if (resp_buftype == CIFS_SMALL_BUFFER)
1792                 srch_inf->smallBuf = true;
1793         else
1794                 cifs_dbg(VFS, "illegal search buffer type\n");
1795
1796         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1797                 srch_inf->endOfSearch = 1;
1798         else
1799                 srch_inf->endOfSearch = 0;
1800
1801         return rc;
1802
1803 qdir_exit:
1804         free_rsp_buf(resp_buftype, rsp);
1805         return rc;
1806 }
1807
1808 static int
1809 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1810                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1811                unsigned int num, void **data, unsigned int *size)
1812 {
1813         struct smb2_set_info_req *req;
1814         struct smb2_set_info_rsp *rsp = NULL;
1815         struct kvec *iov;
1816         int rc = 0;
1817         int resp_buftype;
1818         unsigned int i;
1819         struct TCP_Server_Info *server;
1820         struct cifs_ses *ses = tcon->ses;
1821
1822         if (ses && (ses->server))
1823                 server = ses->server;
1824         else
1825                 return -EIO;
1826
1827         if (!num)
1828                 return -EINVAL;
1829
1830         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1831         if (!iov)
1832                 return -ENOMEM;
1833
1834         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1835         if (rc) {
1836                 kfree(iov);
1837                 return rc;
1838         }
1839
1840         req->hdr.ProcessId = cpu_to_le32(pid);
1841
1842         req->InfoType = SMB2_O_INFO_FILE;
1843         req->FileInfoClass = info_class;
1844         req->PersistentFileId = persistent_fid;
1845         req->VolatileFileId = volatile_fid;
1846
1847         /* 4 for RFC1001 length and 1 for Buffer */
1848         req->BufferOffset =
1849                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1850         req->BufferLength = cpu_to_le32(*size);
1851
1852         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1853
1854         memcpy(req->Buffer, *data, *size);
1855
1856         iov[0].iov_base = (char *)req;
1857         /* 4 for RFC1001 length */
1858         iov[0].iov_len = get_rfc1002_length(req) + 4;
1859
1860         for (i = 1; i < num; i++) {
1861                 inc_rfc1001_len(req, size[i]);
1862                 le32_add_cpu(&req->BufferLength, size[i]);
1863                 iov[i].iov_base = (char *)data[i];
1864                 iov[i].iov_len = size[i];
1865         }
1866
1867         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1868         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1869
1870         if (rc != 0) {
1871                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1872                 goto out;
1873         }
1874 out:
1875         free_rsp_buf(resp_buftype, rsp);
1876         kfree(iov);
1877         return rc;
1878 }
1879
1880 int
1881 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1882             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1883 {
1884         struct smb2_file_rename_info info;
1885         void **data;
1886         unsigned int size[2];
1887         int rc;
1888         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1889
1890         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1891         if (!data)
1892                 return -ENOMEM;
1893
1894         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1895                               /* 0 = fail if target already exists */
1896         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1897         info.FileNameLength = cpu_to_le32(len);
1898
1899         data[0] = &info;
1900         size[0] = sizeof(struct smb2_file_rename_info);
1901
1902         data[1] = target_file;
1903         size[1] = len + 2 /* null */;
1904
1905         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1906                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1907                            size);
1908         kfree(data);
1909         return rc;
1910 }
1911
1912 int
1913 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1914                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1915 {
1916         struct smb2_file_link_info info;
1917         void **data;
1918         unsigned int size[2];
1919         int rc;
1920         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1921
1922         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1923         if (!data)
1924                 return -ENOMEM;
1925
1926         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1927                               /* 0 = fail if link already exists */
1928         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1929         info.FileNameLength = cpu_to_le32(len);
1930
1931         data[0] = &info;
1932         size[0] = sizeof(struct smb2_file_link_info);
1933
1934         data[1] = target_file;
1935         size[1] = len + 2 /* null */;
1936
1937         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1938                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1939         kfree(data);
1940         return rc;
1941 }
1942
1943 int
1944 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1945              u64 volatile_fid, u32 pid, __le64 *eof)
1946 {
1947         struct smb2_file_eof_info info;
1948         void *data;
1949         unsigned int size;
1950
1951         info.EndOfFile = *eof;
1952
1953         data = &info;
1954         size = sizeof(struct smb2_file_eof_info);
1955
1956         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1957                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1958 }
1959
1960 int
1961 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1962               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
1963 {
1964         unsigned int size;
1965         size = sizeof(FILE_BASIC_INFO);
1966         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
1967                              current->tgid, FILE_BASIC_INFORMATION, 1,
1968                              (void **)&buf, &size);
1969 }
1970
1971 int
1972 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
1973                   const u64 persistent_fid, const u64 volatile_fid,
1974                   __u8 oplock_level)
1975 {
1976         int rc;
1977         struct smb2_oplock_break *req = NULL;
1978
1979         cifs_dbg(FYI, "SMB2_oplock_break\n");
1980         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
1981
1982         if (rc)
1983                 return rc;
1984
1985         req->VolatileFid = volatile_fid;
1986         req->PersistentFid = persistent_fid;
1987         req->OplockLevel = oplock_level;
1988         req->hdr.CreditRequest = cpu_to_le16(1);
1989
1990         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
1991         /* SMB2 buffer freed by function above */
1992
1993         if (rc) {
1994                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
1995                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
1996         }
1997
1998         return rc;
1999 }
2000
2001 static void
2002 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2003                         struct kstatfs *kst)
2004 {
2005         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2006                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2007         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2008         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2009         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2010         return;
2011 }
2012
2013 static int
2014 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2015                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2016 {
2017         int rc;
2018         struct smb2_query_info_req *req;
2019
2020         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2021
2022         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2023                 return -EIO;
2024
2025         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2026         if (rc)
2027                 return rc;
2028
2029         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2030         req->FileInfoClass = level;
2031         req->PersistentFileId = persistent_fid;
2032         req->VolatileFileId = volatile_fid;
2033         /* 4 for rfc1002 length field and 1 for pad */
2034         req->InputBufferOffset =
2035                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2036         req->OutputBufferLength = cpu_to_le32(
2037                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2038
2039         iov->iov_base = (char *)req;
2040         /* 4 for rfc1002 length field */
2041         iov->iov_len = get_rfc1002_length(req) + 4;
2042         return 0;
2043 }
2044
2045 int
2046 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2047               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2048 {
2049         struct smb2_query_info_rsp *rsp = NULL;
2050         struct kvec iov;
2051         int rc = 0;
2052         int resp_buftype;
2053         struct cifs_ses *ses = tcon->ses;
2054         struct smb2_fs_full_size_info *info = NULL;
2055
2056         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2057                                 sizeof(struct smb2_fs_full_size_info),
2058                                 persistent_fid, volatile_fid);
2059         if (rc)
2060                 return rc;
2061
2062         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2063         if (rc) {
2064                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2065                 goto qinf_exit;
2066         }
2067         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2068
2069         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2070                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2071         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2072                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2073                           sizeof(struct smb2_fs_full_size_info));
2074         if (!rc)
2075                 copy_fs_info_to_kstatfs(info, fsdata);
2076
2077 qinf_exit:
2078         free_rsp_buf(resp_buftype, iov.iov_base);
2079         return rc;
2080 }
2081
2082 int
2083 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2084            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2085            const __u32 num_lock, struct smb2_lock_element *buf)
2086 {
2087         int rc = 0;
2088         struct smb2_lock_req *req = NULL;
2089         struct kvec iov[2];
2090         int resp_buf_type;
2091         unsigned int count;
2092
2093         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2094
2095         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2096         if (rc)
2097                 return rc;
2098
2099         req->hdr.ProcessId = cpu_to_le32(pid);
2100         req->LockCount = cpu_to_le16(num_lock);
2101
2102         req->PersistentFileId = persist_fid;
2103         req->VolatileFileId = volatile_fid;
2104
2105         count = num_lock * sizeof(struct smb2_lock_element);
2106         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2107
2108         iov[0].iov_base = (char *)req;
2109         /* 4 for rfc1002 length field and count for all locks */
2110         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2111         iov[1].iov_base = (char *)buf;
2112         iov[1].iov_len = count;
2113
2114         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2115         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2116         if (rc) {
2117                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2118                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2119         }
2120
2121         return rc;
2122 }
2123
2124 int
2125 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2126           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2127           const __u64 length, const __u64 offset, const __u32 lock_flags,
2128           const bool wait)
2129 {
2130         struct smb2_lock_element lock;
2131
2132         lock.Offset = cpu_to_le64(offset);
2133         lock.Length = cpu_to_le64(length);
2134         lock.Flags = cpu_to_le32(lock_flags);
2135         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2136                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2137
2138         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2139 }
2140
2141 int
2142 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2143                  __u8 *lease_key, const __le32 lease_state)
2144 {
2145         int rc;
2146         struct smb2_lease_ack *req = NULL;
2147
2148         cifs_dbg(FYI, "SMB2_lease_break\n");
2149         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2150
2151         if (rc)
2152                 return rc;
2153
2154         req->hdr.CreditRequest = cpu_to_le16(1);
2155         req->StructureSize = cpu_to_le16(36);
2156         inc_rfc1001_len(req, 12);
2157
2158         memcpy(req->LeaseKey, lease_key, 16);
2159         req->LeaseState = lease_state;
2160
2161         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2162         /* SMB2 buffer freed by function above */
2163
2164         if (rc) {
2165                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2166                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2167         }
2168
2169         return rc;
2170 }