fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2011
   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 &&
 123             (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
 124                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 125 out:
 126         pdu->StructureSize2 = cpu_to_le16(parmsize);
 127         return;
 128 }
 129
 130 static int
 131 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 132 {
 133         int rc = 0;
 134         struct nls_table *nls_codepage;
 135         struct cifs_ses *ses;
 136         struct TCP_Server_Info *server;
 137
 138         /*
 139          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 140          * check for tcp and smb session status done differently
 141          * for those three - in the calling routine.
 142          */
 143         if (tcon == NULL)
 144                 return rc;
 145
 146         if (smb2_command == SMB2_TREE_CONNECT)
 147                 return rc;
 148
 149         if (tcon->tidStatus == CifsExiting) {
 150                 /*
 151                  * only tree disconnect, open, and write,
 152                  * (and ulogoff which does not have tcon)
 153                  * are allowed as we start force umount.
 154                  */
 155                 if ((smb2_command != SMB2_WRITE) &&
 156                    (smb2_command != SMB2_CREATE) &&
 157                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 158                         cFYI(1, "can not send cmd %d while umounting",
 159                                 smb2_command);
 160                         return -ENODEV;
 161                 }
 162         }
 163         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 164             (!tcon->ses->server))
 165                 return -EIO;
 166
 167         ses = tcon->ses;
 168         server = ses->server;
 169
 170         /*
 171          * Give demultiplex thread up to 10 seconds to reconnect, should be
 172          * greater than cifs socket timeout which is 7 seconds
 173          */
 174         while (server->tcpStatus == CifsNeedReconnect) {
 175                 /*
 176                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 177                  * here since they are implicitly done when session drops.
 178                  */
 179                 switch (smb2_command) {
 180                 /*
 181                  * BB Should we keep oplock break and add flush to exceptions?
 182                  */
 183                 case SMB2_TREE_DISCONNECT:
 184                 case SMB2_CANCEL:
 185                 case SMB2_CLOSE:
 186                 case SMB2_OPLOCK_BREAK:
 187                         return -EAGAIN;
 188                 }
 189
 190                 wait_event_interruptible_timeout(server->response_q,
 191                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 192
 193                 /* are we still trying to reconnect? */
 194                 if (server->tcpStatus != CifsNeedReconnect)
 195                         break;
 196
 197                 /*
 198                  * on "soft" mounts we wait once. Hard mounts keep
 199                  * retrying until process is killed or server comes
 200                  * back on-line
 201                  */
 202                 if (!tcon->retry) {
 203                         cFYI(1, "gave up waiting on reconnect in smb_init");
 204                         return -EHOSTDOWN;
 205                 }
 206         }
 207
 208         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 209                 return rc;
 210
 211         nls_codepage = load_nls_default();
 212
 213         /*
 214          * need to prevent multiple threads trying to simultaneously reconnect
 215          * the same SMB session
 216          */
 217         mutex_lock(&tcon->ses->session_mutex);
 218         rc = cifs_negotiate_protocol(0, tcon->ses);
 219         if (!rc && tcon->ses->need_reconnect)
 220                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 221
 222         if (rc || !tcon->need_reconnect) {
 223                 mutex_unlock(&tcon->ses->session_mutex);
 224                 goto out;
 225         }
 226
 227         cifs_mark_open_files_invalid(tcon);
 228         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 229         mutex_unlock(&tcon->ses->session_mutex);
 230         cFYI(1, "reconnect tcon rc = %d", rc);
 231         if (rc)
 232                 goto out;
 233         atomic_inc(&tconInfoReconnectCount);
 234         /*
 235          * BB FIXME add code to check if wsize needs update due to negotiated
 236          * smb buffer size shrinking.
 237          */
 238 out:
 239         /*
 240          * Check if handle based operation so we know whether we can continue
 241          * or not without returning to caller to reset file handle.
 242          */
 243         /*
 244          * BB Is flush done by server on drop of tcp session? Should we special
 245          * case it and skip above?
 246          */
 247         switch (smb2_command) {
 248         case SMB2_FLUSH:
 249         case SMB2_READ:
 250         case SMB2_WRITE:
 251         case SMB2_LOCK:
 252         case SMB2_IOCTL:
 253         case SMB2_QUERY_DIRECTORY:
 254         case SMB2_CHANGE_NOTIFY:
 255         case SMB2_QUERY_INFO:
 256         case SMB2_SET_INFO:
 257                 return -EAGAIN;
 258         }
 259         unload_nls(nls_codepage);
 260         return rc;
 261 }
 262
 263 /*
 264  * Allocate and return pointer to an SMB request hdr, and set basic
 265  * SMB information in the SMB header. If the return code is zero, this
 266  * function must have filled in request_buf pointer.
 267  */
 268 static int
 269 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 270                 void **request_buf)
 271 {
 272         int rc = 0;
 273
 274         rc = smb2_reconnect(smb2_command, tcon);
 275         if (rc)
 276                 return rc;
 277
 278         /* BB eventually switch this to SMB2 specific small buf size */
 279         *request_buf = cifs_small_buf_get();
 280         if (*request_buf == NULL) {
 281                 /* BB should we add a retry in here if not a writepage? */
 282                 return -ENOMEM;
 283         }
 284
 285         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 286
 287         if (tcon != NULL) {
 288 #ifdef CONFIG_CIFS_STATS2
 289                 uint16_t com_code = le16_to_cpu(smb2_command);
 290                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 291 #endif
 292                 cifs_stats_inc(&tcon->num_smbs_sent);
 293         }
 294
 295         return rc;
 296 }
 297
 298 static void
 299 free_rsp_buf(int resp_buftype, void *rsp)
 300 {
 301         if (resp_buftype == CIFS_SMALL_BUFFER)
 302                 cifs_small_buf_release(rsp);
 303         else if (resp_buftype == CIFS_LARGE_BUFFER)
 304                 cifs_buf_release(rsp);
 305 }
 306
 307 #define SMB2_NUM_PROT 1
 308
 309 #define SMB2_PROT   0
 310 #define SMB21_PROT  1
 311 #define BAD_PROT 0xFFFF
 312
 313 #define SMB2_PROT_ID  0x0202
 314 #define SMB21_PROT_ID 0x0210
 315 #define BAD_PROT_ID   0xFFFF
 316
 317 static struct {
 318         int index;
 319         __le16 name;
 320 } smb2protocols[] = {
 321         {SMB2_PROT,  cpu_to_le16(SMB2_PROT_ID)},
 322         {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
 323         {BAD_PROT,   cpu_to_le16(BAD_PROT_ID)}
 324 };
 325
 326 /*
 327  *
 328  *      SMB2 Worker functions follow:
 329  *
 330  *      The general structure of the worker functions is:
 331  *      1) Call smb2_init (assembles SMB2 header)
 332  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 333  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 334  *      4) Decode SMB2 command specific fields in the fixed length area
 335  *      5) Decode variable length data area (if any for this SMB2 command type)
 336  *      6) Call free smb buffer
 337  *      7) return
 338  *
 339  */
 340
 341 int
 342 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 343 {
 344         struct smb2_negotiate_req *req;
 345         struct smb2_negotiate_rsp *rsp;
 346         struct kvec iov[1];
 347         int rc = 0;
 348         int resp_buftype;
 349         struct TCP_Server_Info *server;
 350         unsigned int sec_flags;
 351         u16 i;
 352         u16 temp = 0;
 353         int blob_offset, blob_length;
 354         char *security_blob;
 355         int flags = CIFS_NEG_OP;
 356
 357         cFYI(1, "Negotiate protocol");
 358
 359         if (ses->server)
 360                 server = ses->server;
 361         else {
 362                 rc = -EIO;
 363                 return rc;
 364         }
 365
 366         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 367         if (rc)
 368                 return rc;
 369
 370         /* if any of auth flags (ie not sign or seal) are overriden use them */
 371         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 372                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 373         else /* if override flags set only sign/seal OR them with global auth */
 374                 sec_flags = global_secflags | ses->overrideSecFlg;
 375
 376         cFYI(1, "sec_flags 0x%x", sec_flags);
 377
 378         req->hdr.SessionId = 0;
 379
 380         for (i = 0; i < SMB2_NUM_PROT; i++)
 381                 req->Dialects[i] = smb2protocols[i].name;
 382
 383         req->DialectCount = cpu_to_le16(i);
 384         inc_rfc1001_len(req, i * 2);
 385
 386         /* only one of SMB2 signing flags may be set in SMB2 request */
 387         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 388                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 389         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 390                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 391
 392         req->SecurityMode = cpu_to_le16(temp);
 393
 394         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
 395
 396         iov[0].iov_base = (char *)req;
 397         /* 4 for rfc1002 length field */
 398         iov[0].iov_len = get_rfc1002_length(req) + 4;
 399
 400         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 401
 402         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 403         /*
 404          * No tcon so can't do
 405          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 406          */
 407         if (rc != 0)
 408                 goto neg_exit;
 409
 410         if (rsp == NULL) {
 411                 rc = -EIO;
 412                 goto neg_exit;
 413         }
 414
 415         cFYI(1, "mode 0x%x", rsp->SecurityMode);
 416
 417         if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
 418                 cFYI(1, "negotiated smb2.1 dialect");
 419         else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
 420                 cFYI(1, "negotiated smb2 dialect");
 421         else {
 422                 cERROR(1, "Illegal dialect returned by server %d",
 423                            le16_to_cpu(rsp->DialectRevision));
 424                 rc = -EIO;
 425                 goto neg_exit;
 426         }
 427         server->dialect = le16_to_cpu(rsp->DialectRevision);
 428
 429         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 430         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 431         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 432         /* BB Do we need to validate the SecurityMode? */
 433         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 434         server->capabilities = le32_to_cpu(rsp->Capabilities);
 435         /* Internal types */
 436         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 437
 438         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 439                                                &rsp->hdr);
 440         if (blob_length == 0) {
 441                 cERROR(1, "missing security blob on negprot");
 442                 rc = -EIO;
 443                 goto neg_exit;
 444         }
 445
 446         cFYI(1, "sec_flags 0x%x", sec_flags);
 447         if (sec_flags & CIFSSEC_MUST_SIGN) {
 448                 cFYI(1, "Signing required");
 449                 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
 450                       SMB2_NEGOTIATE_SIGNING_ENABLED))) {
 451                         cERROR(1, "signing required but server lacks support");
 452                         rc = -EOPNOTSUPP;
 453                         goto neg_exit;
 454                 }
 455                 server->sec_mode |= SECMODE_SIGN_REQUIRED;
 456         } else if (sec_flags & CIFSSEC_MAY_SIGN) {
 457                 cFYI(1, "Signing optional");
 458                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 459                         cFYI(1, "Server requires signing");
 460                         server->sec_mode |= SECMODE_SIGN_REQUIRED;
 461                 } else {
 462                         server->sec_mode &=
 463                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 464                 }
 465         } else {
 466                 cFYI(1, "Signing disabled");
 467                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 468                         cERROR(1, "Server requires packet signing to be enabled"
 469                                   " in /proc/fs/cifs/SecurityFlags.");
 470                         rc = -EOPNOTSUPP;
 471                         goto neg_exit;
 472                 }
 473                 server->sec_mode &=
 474                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 475         }
 476
 477 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 478         rc = decode_neg_token_init(security_blob, blob_length,
 479                                    &server->sec_type);
 480         if (rc == 1)
 481                 rc = 0;
 482         else if (rc == 0) {
 483                 rc = -EIO;
 484                 goto neg_exit;
 485         }
 486 #endif
 487
 488 neg_exit:
 489         free_rsp_buf(resp_buftype, rsp);
 490         return rc;
 491 }
 492
 493 int
 494 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 495                 const struct nls_table *nls_cp)
 496 {
 497         struct smb2_sess_setup_req *req;
 498         struct smb2_sess_setup_rsp *rsp = NULL;
 499         struct kvec iov[2];
 500         int rc = 0;
 501         int resp_buftype;
 502         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 503         struct TCP_Server_Info *server;
 504         unsigned int sec_flags;
 505         u8 temp = 0;
 506         u16 blob_length = 0;
 507         char *security_blob;
 508         char *ntlmssp_blob = NULL;
 509         bool use_spnego = false; /* else use raw ntlmssp */
 510
 511         cFYI(1, "Session Setup");
 512
 513         if (ses->server)
 514                 server = ses->server;
 515         else {
 516                 rc = -EIO;
 517                 return rc;
 518         }
 519
 520         /*
 521          * If memory allocation is successful, caller of this function
 522          * frees it.
 523          */
 524         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 525         if (!ses->ntlmssp)
 526                 return -ENOMEM;
 527
 528         ses->server->secType = RawNTLMSSP;
 529
 530 ssetup_ntlmssp_authenticate:
 531         if (phase == NtLmChallenge)
 532                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 533
 534         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 535         if (rc)
 536                 return rc;
 537
 538         /* if any of auth flags (ie not sign or seal) are overriden use them */
 539         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 540                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 541         else /* if override flags set only sign/seal OR them with global auth */
 542                 sec_flags = global_secflags | ses->overrideSecFlg;
 543
 544         cFYI(1, "sec_flags 0x%x", sec_flags);
 545
 546         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 547         req->VcNumber = 0; /* MBZ */
 548         /* to enable echos and oplocks */
 549         req->hdr.CreditRequest = cpu_to_le16(3);
 550
 551         /* only one of SMB2 signing flags may be set in SMB2 request */
 552         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 553                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 554         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 555                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 556         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 557                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 558
 559         req->SecurityMode = temp;
 560         req->Capabilities = 0;
 561         req->Channel = 0; /* MBZ */
 562
 563         iov[0].iov_base = (char *)req;
 564         /* 4 for rfc1002 length field and 1 for pad */
 565         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 566         if (phase == NtLmNegotiate) {
 567                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 568                                        GFP_KERNEL);
 569                 if (ntlmssp_blob == NULL) {
 570                         rc = -ENOMEM;
 571                         goto ssetup_exit;
 572                 }
 573                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 574                 if (use_spnego) {
 575                         /* blob_length = build_spnego_ntlmssp_blob(
 576                                         &security_blob,
 577                                         sizeof(struct _NEGOTIATE_MESSAGE),
 578                                         ntlmssp_blob); */
 579                         /* BB eventually need to add this */
 580                         cERROR(1, "spnego not supported for SMB2 yet");
 581                         rc = -EOPNOTSUPP;
 582                         kfree(ntlmssp_blob);
 583                         goto ssetup_exit;
 584                 } else {
 585                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 586                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 587                         security_blob = ntlmssp_blob;
 588                 }
 589         } else if (phase == NtLmAuthenticate) {
 590                 req->hdr.SessionId = ses->Suid;
 591                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 592                                        GFP_KERNEL);
 593                 if (ntlmssp_blob == NULL) {
 594                         cERROR(1, "failed to malloc ntlmssp blob");
 595                         rc = -ENOMEM;
 596                         goto ssetup_exit;
 597                 }
 598                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 599                                              nls_cp);
 600                 if (rc) {
 601                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
 602                         goto ssetup_exit; /* BB double check error handling */
 603                 }
 604                 if (use_spnego) {
 605                         /* blob_length = build_spnego_ntlmssp_blob(
 606                                                         &security_blob,
 607                                                         blob_length,
 608                                                         ntlmssp_blob); */
 609                         cERROR(1, "spnego not supported for SMB2 yet");
 610                         rc = -EOPNOTSUPP;
 611                         kfree(ntlmssp_blob);
 612                         goto ssetup_exit;
 613                 } else {
 614                         security_blob = ntlmssp_blob;
 615                 }
 616         } else {
 617                 cERROR(1, "illegal ntlmssp phase");
 618                 rc = -EIO;
 619                 goto ssetup_exit;
 620         }
 621
 622         /* Testing shows that buffer offset must be at location of Buffer[0] */
 623         req->SecurityBufferOffset =
 624                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 625                                             1 /* pad */ - 4 /* rfc1001 len */);
 626         req->SecurityBufferLength = cpu_to_le16(blob_length);
 627         iov[1].iov_base = security_blob;
 628         iov[1].iov_len = blob_length;
 629
 630         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 631
 632         /* BB add code to build os and lm fields */
 633
 634         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
 635
 636         kfree(security_blob);
 637         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 638         if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 639                 if (phase != NtLmNegotiate) {
 640                         cERROR(1, "Unexpected more processing error");
 641                         goto ssetup_exit;
 642                 }
 643                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 644                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 645                         cERROR(1, "Invalid security buffer offset %d",
 646                                   le16_to_cpu(rsp->SecurityBufferOffset));
 647                         rc = -EIO;
 648                         goto ssetup_exit;
 649                 }
 650
 651                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 652                 phase = NtLmChallenge; /* process ntlmssp challenge */
 653                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 654                 ses->Suid = rsp->hdr.SessionId;
 655                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 656                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 657         }
 658
 659         /*
 660          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 661          * but at least the raw NTLMSSP case works.
 662          */
 663         /*
 664          * No tcon so can't do
 665          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 666          */
 667         if (rc != 0)
 668                 goto ssetup_exit;
 669
 670         if (rsp == NULL) {
 671                 rc = -EIO;
 672                 goto ssetup_exit;
 673         }
 674
 675         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 676 ssetup_exit:
 677         free_rsp_buf(resp_buftype, rsp);
 678
 679         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 680         if ((phase == NtLmChallenge) && (rc == 0))
 681                 goto ssetup_ntlmssp_authenticate;
 682         return rc;
 683 }
 684
 685 int
 686 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 687 {
 688         struct smb2_logoff_req *req; /* response is also trivial struct */
 689         int rc = 0;
 690         struct TCP_Server_Info *server;
 691
 692         cFYI(1, "disconnect session %p", ses);
 693
 694         if (ses && (ses->server))
 695                 server = ses->server;
 696         else
 697                 return -EIO;
 698
 699         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 700         if (rc)
 701                 return rc;
 702
 703          /* since no tcon, smb2_init can not do this, so do here */
 704         req->hdr.SessionId = ses->Suid;
 705         if (server->sec_mode & SECMODE_SIGN_REQUIRED)
 706                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 707
 708         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 709         /*
 710          * No tcon so can't do
 711          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 712          */
 713         return rc;
 714 }
 715
 716 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 717 {
 718         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 719 }
 720
 721 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 722
 723 int
 724 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 725           struct cifs_tcon *tcon, const struct nls_table *cp)
 726 {
 727         struct smb2_tree_connect_req *req;
 728         struct smb2_tree_connect_rsp *rsp = NULL;
 729         struct kvec iov[2];
 730         int rc = 0;
 731         int resp_buftype;
 732         int unc_path_len;
 733         struct TCP_Server_Info *server;
 734         __le16 *unc_path = NULL;
 735
 736         cFYI(1, "TCON");
 737
 738         if ((ses->server) && tree)
 739                 server = ses->server;
 740         else
 741                 return -EIO;
 742
 743         if (tcon && tcon->bad_network_name)
 744                 return -ENOENT;
 745
 746         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 747         if (unc_path == NULL)
 748                 return -ENOMEM;
 749
 750         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 751         unc_path_len *= 2;
 752         if (unc_path_len < 2) {
 753                 kfree(unc_path);
 754                 return -EINVAL;
 755         }
 756
 757         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 758         if (rc) {
 759                 kfree(unc_path);
 760                 return rc;
 761         }
 762
 763         if (tcon == NULL) {
 764                 /* since no tcon, smb2_init can not do this, so do here */
 765                 req->hdr.SessionId = ses->Suid;
 766                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 767                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 768         }
 769
 770         iov[0].iov_base = (char *)req;
 771         /* 4 for rfc1002 length field and 1 for pad */
 772         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 773
 774         /* Testing shows that buffer offset must be at location of Buffer[0] */
 775         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 776                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 777         req->PathLength = cpu_to_le16(unc_path_len - 2);
 778         iov[1].iov_base = unc_path;
 779         iov[1].iov_len = unc_path_len;
 780
 781         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 782
 783         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 784         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 785
 786         if (rc != 0) {
 787                 if (tcon) {
 788                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 789                         tcon->need_reconnect = true;
 790                 }
 791                 goto tcon_error_exit;
 792         }
 793
 794         if (rsp == NULL) {
 795                 rc = -EIO;
 796                 goto tcon_exit;
 797         }
 798
 799         if (tcon == NULL) {
 800                 ses->ipc_tid = rsp->hdr.TreeId;
 801                 goto tcon_exit;
 802         }
 803
 804         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 805                 cFYI(1, "connection to disk share");
 806         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 807                 tcon->ipc = true;
 808                 cFYI(1, "connection to pipe share");
 809         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 810                 tcon->print = true;
 811                 cFYI(1, "connection to printer");
 812         } else {
 813                 cERROR(1, "unknown share type %d", rsp->ShareType);
 814                 rc = -EOPNOTSUPP;
 815                 goto tcon_error_exit;
 816         }
 817
 818         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 819         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 820         tcon->tidStatus = CifsGood;
 821         tcon->need_reconnect = false;
 822         tcon->tid = rsp->hdr.TreeId;
 823         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 824
 825         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 826             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 827                 cERROR(1, "DFS capability contradicts DFS flag");
 828
 829 tcon_exit:
 830         free_rsp_buf(resp_buftype, rsp);
 831         kfree(unc_path);
 832         return rc;
 833
 834 tcon_error_exit:
 835         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 836                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
 837                 tcon->bad_network_name = true;
 838         }
 839         goto tcon_exit;
 840 }
 841
 842 int
 843 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 844 {
 845         struct smb2_tree_disconnect_req *req; /* response is trivial */
 846         int rc = 0;
 847         struct TCP_Server_Info *server;
 848         struct cifs_ses *ses = tcon->ses;
 849
 850         cFYI(1, "Tree Disconnect");
 851
 852         if (ses && (ses->server))
 853                 server = ses->server;
 854         else
 855                 return -EIO;
 856
 857         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 858                 return 0;
 859
 860         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 861         if (rc)
 862                 return rc;
 863
 864         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 865         if (rc)
 866                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 867
 868         return rc;
 869 }
 870
 871 int
 872 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 873           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 874           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 875           __u8 *oplock, struct smb2_file_all_info *buf)
 876 {
 877         struct smb2_create_req *req;
 878         struct smb2_create_rsp *rsp;
 879         struct TCP_Server_Info *server;
 880         struct cifs_ses *ses = tcon->ses;
 881         struct kvec iov[2];
 882         int resp_buftype;
 883         int uni_path_len;
 884         int rc = 0;
 885         int num_iovecs = 2;
 886
 887         cFYI(1, "create/open");
 888
 889         if (ses && (ses->server))
 890                 server = ses->server;
 891         else
 892                 return -EIO;
 893
 894         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 895         if (rc)
 896                 return rc;
 897
 898         if (server->oplocks)
 899                 req->RequestedOplockLevel = *oplock;
 900         else
 901                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
 902         req->ImpersonationLevel = IL_IMPERSONATION;
 903         req->DesiredAccess = cpu_to_le32(desired_access);
 904         /* File attributes ignored on open (used in create though) */
 905         req->FileAttributes = cpu_to_le32(file_attributes);
 906         req->ShareAccess = FILE_SHARE_ALL_LE;
 907         req->CreateDisposition = cpu_to_le32(create_disposition);
 908         req->CreateOptions = cpu_to_le32(create_options);
 909         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 910         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 911                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 912
 913         iov[0].iov_base = (char *)req;
 914         /* 4 for rfc1002 length field */
 915         iov[0].iov_len = get_rfc1002_length(req) + 4;
 916
 917         /* MUST set path len (NameLength) to 0 opening root of share */
 918         if (uni_path_len >= 4) {
 919                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 920                 /* -1 since last byte is buf[0] which is sent below (path) */
 921                 iov[0].iov_len--;
 922                 iov[1].iov_len = uni_path_len;
 923                 iov[1].iov_base = path;
 924                 /*
 925                  * -1 since last byte is buf[0] which was counted in
 926                  * smb2_buf_len.
 927                  */
 928                 inc_rfc1001_len(req, uni_path_len - 1);
 929         } else {
 930                 num_iovecs = 1;
 931                 req->NameLength = 0;
 932         }
 933
 934         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 935         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 936
 937         if (rc != 0) {
 938                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 939                 goto creat_exit;
 940         }
 941
 942         if (rsp == NULL) {
 943                 rc = -EIO;
 944                 goto creat_exit;
 945         }
 946         *persistent_fid = rsp->PersistentFileId;
 947         *volatile_fid = rsp->VolatileFileId;
 948
 949         if (buf) {
 950                 memcpy(buf, &rsp->CreationTime, 32);
 951                 buf->AllocationSize = rsp->AllocationSize;
 952                 buf->EndOfFile = rsp->EndofFile;
 953                 buf->Attributes = rsp->FileAttributes;
 954                 buf->NumberOfLinks = cpu_to_le32(1);
 955                 buf->DeletePending = 0;
 956         }
 957
 958         *oplock = rsp->OplockLevel;
 959 creat_exit:
 960         free_rsp_buf(resp_buftype, rsp);
 961         return rc;
 962 }
 963
 964 int
 965 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
 966            u64 persistent_fid, u64 volatile_fid)
 967 {
 968         struct smb2_close_req *req;
 969         struct smb2_close_rsp *rsp;
 970         struct TCP_Server_Info *server;
 971         struct cifs_ses *ses = tcon->ses;
 972         struct kvec iov[1];
 973         int resp_buftype;
 974         int rc = 0;
 975
 976         cFYI(1, "Close");
 977
 978         if (ses && (ses->server))
 979                 server = ses->server;
 980         else
 981                 return -EIO;
 982
 983         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
 984         if (rc)
 985                 return rc;
 986
 987         req->PersistentFileId = persistent_fid;
 988         req->VolatileFileId = volatile_fid;
 989
 990         iov[0].iov_base = (char *)req;
 991         /* 4 for rfc1002 length field */
 992         iov[0].iov_len = get_rfc1002_length(req) + 4;
 993
 994         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
 995         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
 996
 997         if (rc != 0) {
 998                 if (tcon)
 999                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1000                 goto close_exit;
1001         }
1002
1003         if (rsp == NULL) {
1004                 rc = -EIO;
1005                 goto close_exit;
1006         }
1007
1008         /* BB FIXME - decode close response, update inode for caching */
1009
1010 close_exit:
1011         free_rsp_buf(resp_buftype, rsp);
1012         return rc;
1013 }
1014
1015 static int
1016 validate_buf(unsigned int offset, unsigned int buffer_length,
1017              struct smb2_hdr *hdr, unsigned int min_buf_size)
1018
1019 {
1020         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1021         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1022         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1023         char *end_of_buf = begin_of_buf + buffer_length;
1024
1025
1026         if (buffer_length < min_buf_size) {
1027                 cERROR(1, "buffer length %d smaller than minimum size %d",
1028                            buffer_length, min_buf_size);
1029                 return -EINVAL;
1030         }
1031
1032         /* check if beyond RFC1001 maximum length */
1033         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1034                 cERROR(1, "buffer length %d or smb length %d too large",
1035                            buffer_length, smb_len);
1036                 return -EINVAL;
1037         }
1038
1039         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1040                 cERROR(1, "illegal server response, bad offset to data");
1041                 return -EINVAL;
1042         }
1043
1044         return 0;
1045 }
1046
1047 /*
1048  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1049  * Caller must free buffer.
1050  */
1051 static int
1052 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1053                       struct smb2_hdr *hdr, unsigned int minbufsize,
1054                       char *data)
1055
1056 {
1057         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1058         int rc;
1059
1060         if (!data)
1061                 return -EINVAL;
1062
1063         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1064         if (rc)
1065                 return rc;
1066
1067         memcpy(data, begin_of_buf, buffer_length);
1068
1069         return 0;
1070 }
1071
1072 static int
1073 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1074            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1075            size_t output_len, size_t min_len, void *data)
1076 {
1077         struct smb2_query_info_req *req;
1078         struct smb2_query_info_rsp *rsp = NULL;
1079         struct kvec iov[2];
1080         int rc = 0;
1081         int resp_buftype;
1082         struct TCP_Server_Info *server;
1083         struct cifs_ses *ses = tcon->ses;
1084
1085         cFYI(1, "Query Info");
1086
1087         if (ses && (ses->server))
1088                 server = ses->server;
1089         else
1090                 return -EIO;
1091
1092         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1093         if (rc)
1094                 return rc;
1095
1096         req->InfoType = SMB2_O_INFO_FILE;
1097         req->FileInfoClass = info_class;
1098         req->PersistentFileId = persistent_fid;
1099         req->VolatileFileId = volatile_fid;
1100         /* 4 for rfc1002 length field and 1 for Buffer */
1101         req->InputBufferOffset =
1102                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1103         req->OutputBufferLength = cpu_to_le32(output_len);
1104
1105         iov[0].iov_base = (char *)req;
1106         /* 4 for rfc1002 length field */
1107         iov[0].iov_len = get_rfc1002_length(req) + 4;
1108
1109         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1110         if (rc) {
1111                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1112                 goto qinf_exit;
1113         }
1114
1115         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1116
1117         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1118                                    le32_to_cpu(rsp->OutputBufferLength),
1119                                    &rsp->hdr, min_len, data);
1120
1121 qinf_exit:
1122         free_rsp_buf(resp_buftype, rsp);
1123         return rc;
1124 }
1125
1126 int
1127 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1128                 u64 persistent_fid, u64 volatile_fid,
1129                 struct smb2_file_all_info *data)
1130 {
1131         return query_info(xid, tcon, persistent_fid, volatile_fid,
1132                           FILE_ALL_INFORMATION,
1133                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1134                           sizeof(struct smb2_file_all_info), data);
1135 }
1136
1137 int
1138 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1139                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1140 {
1141         return query_info(xid, tcon, persistent_fid, volatile_fid,
1142                           FILE_INTERNAL_INFORMATION,
1143                           sizeof(struct smb2_file_internal_info),
1144                           sizeof(struct smb2_file_internal_info), uniqueid);
1145 }
1146
1147 /*
1148  * This is a no-op for now. We're not really interested in the reply, but
1149  * rather in the fact that the server sent one and that server->lstrp
1150  * gets updated.
1151  *
1152  * FIXME: maybe we should consider checking that the reply matches request?
1153  */
1154 static void
1155 smb2_echo_callback(struct mid_q_entry *mid)
1156 {
1157         struct TCP_Server_Info *server = mid->callback_data;
1158         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1159         unsigned int credits_received = 1;
1160
1161         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1162                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1163
1164         DeleteMidQEntry(mid);
1165         add_credits(server, credits_received, CIFS_ECHO_OP);
1166 }
1167
1168 int
1169 SMB2_echo(struct TCP_Server_Info *server)
1170 {
1171         struct smb2_echo_req *req;
1172         int rc = 0;
1173         struct kvec iov;
1174         struct smb_rqst rqst = { .rq_iov = &iov,
1175                                  .rq_nvec = 1 };
1176
1177         cFYI(1, "In echo request");
1178
1179         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1180         if (rc)
1181                 return rc;
1182
1183         req->hdr.CreditRequest = cpu_to_le16(1);
1184
1185         iov.iov_base = (char *)req;
1186         /* 4 for rfc1002 length field */
1187         iov.iov_len = get_rfc1002_length(req) + 4;
1188
1189         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1190                              CIFS_ECHO_OP);
1191         if (rc)
1192                 cFYI(1, "Echo request failed: %d", rc);
1193
1194         cifs_small_buf_release(req);
1195         return rc;
1196 }
1197
1198 int
1199 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1200            u64 volatile_fid)
1201 {
1202         struct smb2_flush_req *req;
1203         struct TCP_Server_Info *server;
1204         struct cifs_ses *ses = tcon->ses;
1205         struct kvec iov[1];
1206         int resp_buftype;
1207         int rc = 0;
1208
1209         cFYI(1, "Flush");
1210
1211         if (ses && (ses->server))
1212                 server = ses->server;
1213         else
1214                 return -EIO;
1215
1216         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1217         if (rc)
1218                 return rc;
1219
1220         req->PersistentFileId = persistent_fid;
1221         req->VolatileFileId = volatile_fid;
1222
1223         iov[0].iov_base = (char *)req;
1224         /* 4 for rfc1002 length field */
1225         iov[0].iov_len = get_rfc1002_length(req) + 4;
1226
1227         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1228
1229         if ((rc != 0) && tcon)
1230                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1231
1232         free_rsp_buf(resp_buftype, iov[0].iov_base);
1233         return rc;
1234 }
1235
1236 /*
1237  * To form a chain of read requests, any read requests after the first should
1238  * have the end_of_chain boolean set to true.
1239  */
1240 static int
1241 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1242                   unsigned int remaining_bytes, int request_type)
1243 {
1244         int rc = -EACCES;
1245         struct smb2_read_req *req = NULL;
1246
1247         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1248         if (rc)
1249                 return rc;
1250         if (io_parms->tcon->ses->server == NULL)
1251                 return -ECONNABORTED;
1252
1253         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1254
1255         req->PersistentFileId = io_parms->persistent_fid;
1256         req->VolatileFileId = io_parms->volatile_fid;
1257         req->ReadChannelInfoOffset = 0; /* reserved */
1258         req->ReadChannelInfoLength = 0; /* reserved */
1259         req->Channel = 0; /* reserved */
1260         req->MinimumCount = 0;
1261         req->Length = cpu_to_le32(io_parms->length);
1262         req->Offset = cpu_to_le64(io_parms->offset);
1263
1264         if (request_type & CHAINED_REQUEST) {
1265                 if (!(request_type & END_OF_CHAIN)) {
1266                         /* 4 for rfc1002 length field */
1267                         req->hdr.NextCommand =
1268                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1269                 } else /* END_OF_CHAIN */
1270                         req->hdr.NextCommand = 0;
1271                 if (request_type & RELATED_REQUEST) {
1272                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1273                         /*
1274                          * Related requests use info from previous read request
1275                          * in chain.
1276                          */
1277                         req->hdr.SessionId = 0xFFFFFFFF;
1278                         req->hdr.TreeId = 0xFFFFFFFF;
1279                         req->PersistentFileId = 0xFFFFFFFF;
1280                         req->VolatileFileId = 0xFFFFFFFF;
1281                 }
1282         }
1283         if (remaining_bytes > io_parms->length)
1284                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1285         else
1286                 req->RemainingBytes = 0;
1287
1288         iov[0].iov_base = (char *)req;
1289         /* 4 for rfc1002 length field */
1290         iov[0].iov_len = get_rfc1002_length(req) + 4;
1291         return rc;
1292 }
1293
1294 static void
1295 smb2_readv_callback(struct mid_q_entry *mid)
1296 {
1297         struct cifs_readdata *rdata = mid->callback_data;
1298         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1299         struct TCP_Server_Info *server = tcon->ses->server;
1300         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
1301         unsigned int credits_received = 1;
1302         struct smb_rqst rqst = { .rq_iov = rdata->iov,
1303                                  .rq_nvec = rdata->nr_iov };
1304
1305         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1306                 mid->mid, mid->mid_state, rdata->result, rdata->bytes);
1307
1308         switch (mid->mid_state) {
1309         case MID_RESPONSE_RECEIVED:
1310                 credits_received = le16_to_cpu(buf->CreditRequest);
1311                 /* result already set, check signature */
1312                 if (server->sec_mode &
1313                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1314                         int rc;
1315
1316                         rc = smb2_verify_signature(&rqst, server);
1317                         if (rc)
1318                                 cERROR(1, "SMB signature verification returned "
1319                                        "error = %d", rc);
1320                 }
1321                 /* FIXME: should this be counted toward the initiating task? */
1322                 task_io_account_read(rdata->bytes);
1323                 cifs_stats_bytes_read(tcon, rdata->bytes);
1324                 break;
1325         case MID_REQUEST_SUBMITTED:
1326         case MID_RETRY_NEEDED:
1327                 rdata->result = -EAGAIN;
1328                 break;
1329         default:
1330                 if (rdata->result != -ENODATA)
1331                         rdata->result = -EIO;
1332         }
1333
1334         if (rdata->result)
1335                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1336
1337         queue_work(cifsiod_wq, &rdata->work);
1338         DeleteMidQEntry(mid);
1339         add_credits(server, credits_received, 0);
1340 }
1341
1342 /* smb2_async_readv - send an async write, and set up mid to handle result */
1343 int
1344 smb2_async_readv(struct cifs_readdata *rdata)
1345 {
1346         int rc;
1347         struct smb2_hdr *buf;
1348         struct cifs_io_parms io_parms;
1349         struct smb_rqst rqst = { .rq_iov = rdata->iov,
1350                                  .rq_nvec = 1 };
1351
1352         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1353                 rdata->offset, rdata->bytes);
1354
1355         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1356         io_parms.offset = rdata->offset;
1357         io_parms.length = rdata->bytes;
1358         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1359         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1360         io_parms.pid = rdata->pid;
1361         rc = smb2_new_read_req(&rdata->iov[0], &io_parms, 0, 0);
1362         if (rc)
1363                 return rc;
1364
1365         buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
1366         /* 4 for rfc1002 length field */
1367         rdata->iov[0].iov_len = get_rfc1002_length(rdata->iov[0].iov_base) + 4;
1368
1369         kref_get(&rdata->refcount);
1370         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1371                              cifs_readv_receive, smb2_readv_callback,
1372                              rdata, 0);
1373         if (rc)
1374                 kref_put(&rdata->refcount, cifs_readdata_release);
1375
1376         cifs_small_buf_release(buf);
1377         return rc;
1378 }
1379
1380 int
1381 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1382           unsigned int *nbytes, char **buf, int *buf_type)
1383 {
1384         int resp_buftype, rc = -EACCES;
1385         struct smb2_read_rsp *rsp = NULL;
1386         struct kvec iov[1];
1387
1388         *nbytes = 0;
1389         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1390         if (rc)
1391                 return rc;
1392
1393         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1394                           &resp_buftype, CIFS_LOG_ERROR);
1395
1396         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1397
1398         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1399                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1400                 return 0;
1401         }
1402
1403         if (rc) {
1404                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1405                 cERROR(1, "Send error in read = %d", rc);
1406         } else {
1407                 *nbytes = le32_to_cpu(rsp->DataLength);
1408                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1409                     (*nbytes > io_parms->length)) {
1410                         cFYI(1, "bad length %d for count %d", *nbytes,
1411                                 io_parms->length);
1412                         rc = -EIO;
1413                         *nbytes = 0;
1414                 }
1415         }
1416
1417         if (*buf) {
1418                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1419                        *nbytes);
1420                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1421         } else if (resp_buftype != CIFS_NO_BUFFER) {
1422                 *buf = iov[0].iov_base;
1423                 if (resp_buftype == CIFS_SMALL_BUFFER)
1424                         *buf_type = CIFS_SMALL_BUFFER;
1425                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1426                         *buf_type = CIFS_LARGE_BUFFER;
1427         }
1428         return rc;
1429 }
1430
1431 /*
1432  * Check the mid_state and signature on received buffer (if any), and queue the
1433  * workqueue completion task.
1434  */
1435 static void
1436 smb2_writev_callback(struct mid_q_entry *mid)
1437 {
1438         struct cifs_writedata *wdata = mid->callback_data;
1439         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1440         unsigned int written;
1441         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1442         unsigned int credits_received = 1;
1443
1444         switch (mid->mid_state) {
1445         case MID_RESPONSE_RECEIVED:
1446                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1447                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1448                 if (wdata->result != 0)
1449                         break;
1450
1451                 written = le32_to_cpu(rsp->DataLength);
1452                 /*
1453                  * Mask off high 16 bits when bytes written as returned
1454                  * by the server is greater than bytes requested by the
1455                  * client. OS/2 servers are known to set incorrect
1456                  * CountHigh values.
1457                  */
1458                 if (written > wdata->bytes)
1459                         written &= 0xFFFF;
1460
1461                 if (written < wdata->bytes)
1462                         wdata->result = -ENOSPC;
1463                 else
1464                         wdata->bytes = written;
1465                 break;
1466         case MID_REQUEST_SUBMITTED:
1467         case MID_RETRY_NEEDED:
1468                 wdata->result = -EAGAIN;
1469                 break;
1470         default:
1471                 wdata->result = -EIO;
1472                 break;
1473         }
1474
1475         if (wdata->result)
1476                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1477
1478         queue_work(cifsiod_wq, &wdata->work);
1479         DeleteMidQEntry(mid);
1480         add_credits(tcon->ses->server, credits_received, 0);
1481 }
1482
1483 /* smb2_async_writev - send an async write, and set up mid to handle result */
1484 int
1485 smb2_async_writev(struct cifs_writedata *wdata)
1486 {
1487         int i, rc = -EACCES;
1488         struct smb2_write_req *req = NULL;
1489         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1490         struct kvec *iov = NULL;
1491         struct smb_rqst rqst;
1492
1493         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1494         if (rc)
1495                 goto async_writev_out;
1496
1497         /* 1 iov per page + 1 for header */
1498         iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS);
1499         if (iov == NULL) {
1500                 rc = -ENOMEM;
1501                 goto async_writev_out;
1502         }
1503         rqst.rq_iov = iov;
1504         rqst.rq_nvec = wdata->nr_pages + 1;
1505
1506         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1507
1508         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1509         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1510         req->WriteChannelInfoOffset = 0;
1511         req->WriteChannelInfoLength = 0;
1512         req->Channel = 0;
1513         req->Offset = cpu_to_le64(wdata->offset);
1514         /* 4 for rfc1002 length field */
1515         req->DataOffset = cpu_to_le16(
1516                                 offsetof(struct smb2_write_req, Buffer) - 4);
1517         req->RemainingBytes = 0;
1518
1519         /* 4 for rfc1002 length field and 1 for Buffer */
1520         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1521         iov[0].iov_base = (char *)req;
1522
1523         /*
1524          * This function should marshal up the page array into the kvec
1525          * array, reserving [0] for the header. It should kmap the pages
1526          * and set the iov_len properly for each one. It may also set
1527          * wdata->bytes too.
1528          */
1529         cifs_kmap_lock();
1530         wdata->marshal_iov(iov, wdata);
1531         cifs_kmap_unlock();
1532
1533         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1534
1535         req->Length = cpu_to_le32(wdata->bytes);
1536
1537         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1538
1539         kref_get(&wdata->refcount);
1540         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1541                                 smb2_writev_callback, wdata, 0);
1542
1543         if (rc)
1544                 kref_put(&wdata->refcount, cifs_writedata_release);
1545
1546         /* send is done, unmap pages */
1547         for (i = 0; i < wdata->nr_pages; i++)
1548                 kunmap(wdata->pages[i]);
1549
1550 async_writev_out:
1551         cifs_small_buf_release(req);
1552         kfree(iov);
1553         return rc;
1554 }
1555
1556 /*
1557  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1558  * The length field from io_parms must be at least 1 and indicates a number of
1559  * elements with data to write that begins with position 1 in iov array. All
1560  * data length is specified by count.
1561  */
1562 int
1563 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1564            unsigned int *nbytes, struct kvec *iov, int n_vec)
1565 {
1566         int rc = 0;
1567         struct smb2_write_req *req = NULL;
1568         struct smb2_write_rsp *rsp = NULL;
1569         int resp_buftype;
1570         *nbytes = 0;
1571
1572         if (n_vec < 1)
1573                 return rc;
1574
1575         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1576         if (rc)
1577                 return rc;
1578
1579         if (io_parms->tcon->ses->server == NULL)
1580                 return -ECONNABORTED;
1581
1582         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1583
1584         req->PersistentFileId = io_parms->persistent_fid;
1585         req->VolatileFileId = io_parms->volatile_fid;
1586         req->WriteChannelInfoOffset = 0;
1587         req->WriteChannelInfoLength = 0;
1588         req->Channel = 0;
1589         req->Length = cpu_to_le32(io_parms->length);
1590         req->Offset = cpu_to_le64(io_parms->offset);
1591         /* 4 for rfc1002 length field */
1592         req->DataOffset = cpu_to_le16(
1593                                 offsetof(struct smb2_write_req, Buffer) - 4);
1594         req->RemainingBytes = 0;
1595
1596         iov[0].iov_base = (char *)req;
1597         /* 4 for rfc1002 length field and 1 for Buffer */
1598         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1599
1600         /* length of entire message including data to be written */
1601         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1602
1603         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1604                           &resp_buftype, 0);
1605
1606         if (rc) {
1607                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1608                 cERROR(1, "Send error in write = %d", rc);
1609         } else {
1610                 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1611                 *nbytes = le32_to_cpu(rsp->DataLength);
1612                 free_rsp_buf(resp_buftype, rsp);
1613         }
1614         return rc;
1615 }
1616
1617 static unsigned int
1618 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1619 {
1620         int len;
1621         unsigned int entrycount = 0;
1622         unsigned int next_offset = 0;
1623         FILE_DIRECTORY_INFO *entryptr;
1624
1625         if (bufstart == NULL)
1626                 return 0;
1627
1628         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1629
1630         while (1) {
1631                 entryptr = (FILE_DIRECTORY_INFO *)
1632                                         ((char *)entryptr + next_offset);
1633
1634                 if ((char *)entryptr + size > end_of_buf) {
1635                         cERROR(1, "malformed search entry would overflow");
1636                         break;
1637                 }
1638
1639                 len = le32_to_cpu(entryptr->FileNameLength);
1640                 if ((char *)entryptr + len + size > end_of_buf) {
1641                         cERROR(1, "directory entry name would overflow frame "
1642                                   "end of buf %p", end_of_buf);
1643                         break;
1644                 }
1645
1646                 *lastentry = (char *)entryptr;
1647                 entrycount++;
1648
1649                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1650                 if (!next_offset)
1651                         break;
1652         }
1653
1654         return entrycount;
1655 }
1656
1657 /*
1658  * Readdir/FindFirst
1659  */
1660 int
1661 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1662                      u64 persistent_fid, u64 volatile_fid, int index,
1663                      struct cifs_search_info *srch_inf)
1664 {
1665         struct smb2_query_directory_req *req;
1666         struct smb2_query_directory_rsp *rsp = NULL;
1667         struct kvec iov[2];
1668         int rc = 0;
1669         int len;
1670         int resp_buftype;
1671         unsigned char *bufptr;
1672         struct TCP_Server_Info *server;
1673         struct cifs_ses *ses = tcon->ses;
1674         __le16 asteriks = cpu_to_le16('*');
1675         char *end_of_smb;
1676         unsigned int output_size = CIFSMaxBufSize;
1677         size_t info_buf_size;
1678
1679         if (ses && (ses->server))
1680                 server = ses->server;
1681         else
1682                 return -EIO;
1683
1684         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1685         if (rc)
1686                 return rc;
1687
1688         switch (srch_inf->info_level) {
1689         case SMB_FIND_FILE_DIRECTORY_INFO:
1690                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1691                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1692                 break;
1693         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1694                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1695                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1696                 break;
1697         default:
1698                 cERROR(1, "info level %u isn't supported",
1699                        srch_inf->info_level);
1700                 rc = -EINVAL;
1701                 goto qdir_exit;
1702         }
1703
1704         req->FileIndex = cpu_to_le32(index);
1705         req->PersistentFileId = persistent_fid;
1706         req->VolatileFileId = volatile_fid;
1707
1708         len = 0x2;
1709         bufptr = req->Buffer;
1710         memcpy(bufptr, &asteriks, len);
1711
1712         req->FileNameOffset =
1713                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1714         req->FileNameLength = cpu_to_le16(len);
1715         /*
1716          * BB could be 30 bytes or so longer if we used SMB2 specific
1717          * buffer lengths, but this is safe and close enough.
1718          */
1719         output_size = min_t(unsigned int, output_size, server->maxBuf);
1720         output_size = min_t(unsigned int, output_size, 2 << 15);
1721         req->OutputBufferLength = cpu_to_le32(output_size);
1722
1723         iov[0].iov_base = (char *)req;
1724         /* 4 for RFC1001 length and 1 for Buffer */
1725         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1726
1727         iov[1].iov_base = (char *)(req->Buffer);
1728         iov[1].iov_len = len;
1729
1730         inc_rfc1001_len(req, len - 1 /* Buffer */);
1731
1732         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1733         if (rc) {
1734                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1735                 goto qdir_exit;
1736         }
1737         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1738
1739         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1740                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1741                           info_buf_size);
1742         if (rc)
1743                 goto qdir_exit;
1744
1745         srch_inf->unicode = true;
1746
1747         if (srch_inf->ntwrk_buf_start) {
1748                 if (srch_inf->smallBuf)
1749                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1750                 else
1751                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1752         }
1753         srch_inf->ntwrk_buf_start = (char *)rsp;
1754         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1755                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1756         /* 4 for rfc1002 length field */
1757         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1758         srch_inf->entries_in_buffer =
1759                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1760                                     &srch_inf->last_entry, info_buf_size);
1761         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1762         cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
1763                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1764                 srch_inf->srch_entries_start, srch_inf->last_entry);
1765         if (resp_buftype == CIFS_LARGE_BUFFER)
1766                 srch_inf->smallBuf = false;
1767         else if (resp_buftype == CIFS_SMALL_BUFFER)
1768                 srch_inf->smallBuf = true;
1769         else
1770                 cERROR(1, "illegal search buffer type");
1771
1772         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1773                 srch_inf->endOfSearch = 1;
1774         else
1775                 srch_inf->endOfSearch = 0;
1776
1777         return rc;
1778
1779 qdir_exit:
1780         free_rsp_buf(resp_buftype, rsp);
1781         return rc;
1782 }
1783
1784 static int
1785 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1786                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1787                unsigned int num, void **data, unsigned int *size)
1788 {
1789         struct smb2_set_info_req *req;
1790         struct smb2_set_info_rsp *rsp = NULL;
1791         struct kvec *iov;
1792         int rc = 0;
1793         int resp_buftype;
1794         unsigned int i;
1795         struct TCP_Server_Info *server;
1796         struct cifs_ses *ses = tcon->ses;
1797
1798         if (ses && (ses->server))
1799                 server = ses->server;
1800         else
1801                 return -EIO;
1802
1803         if (!num)
1804                 return -EINVAL;
1805
1806         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1807         if (!iov)
1808                 return -ENOMEM;
1809
1810         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1811         if (rc) {
1812                 kfree(iov);
1813                 return rc;
1814         }
1815
1816         req->hdr.ProcessId = cpu_to_le32(pid);
1817
1818         req->InfoType = SMB2_O_INFO_FILE;
1819         req->FileInfoClass = info_class;
1820         req->PersistentFileId = persistent_fid;
1821         req->VolatileFileId = volatile_fid;
1822
1823         /* 4 for RFC1001 length and 1 for Buffer */
1824         req->BufferOffset =
1825                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1826         req->BufferLength = cpu_to_le32(*size);
1827
1828         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1829
1830         memcpy(req->Buffer, *data, *size);
1831
1832         iov[0].iov_base = (char *)req;
1833         /* 4 for RFC1001 length */
1834         iov[0].iov_len = get_rfc1002_length(req) + 4;
1835
1836         for (i = 1; i < num; i++) {
1837                 inc_rfc1001_len(req, size[i]);
1838                 le32_add_cpu(&req->BufferLength, size[i]);
1839                 iov[i].iov_base = (char *)data[i];
1840                 iov[i].iov_len = size[i];
1841         }
1842
1843         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1844         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1845
1846         if (rc != 0) {
1847                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1848                 goto out;
1849         }
1850
1851         if (rsp == NULL) {
1852                 rc = -EIO;
1853                 goto out;
1854         }
1855
1856 out:
1857         free_rsp_buf(resp_buftype, rsp);
1858         kfree(iov);
1859         return rc;
1860 }
1861
1862 int
1863 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1864             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1865 {
1866         struct smb2_file_rename_info info;
1867         void **data;
1868         unsigned int size[2];
1869         int rc;
1870         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1871
1872         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1873         if (!data)
1874                 return -ENOMEM;
1875
1876         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1877                               /* 0 = fail if target already exists */
1878         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1879         info.FileNameLength = cpu_to_le32(len);
1880
1881         data[0] = &info;
1882         size[0] = sizeof(struct smb2_file_rename_info);
1883
1884         data[1] = target_file;
1885         size[1] = len + 2 /* null */;
1886
1887         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1888                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1889                            size);
1890         kfree(data);
1891         return rc;
1892 }
1893
1894 int
1895 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1896                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1897 {
1898         struct smb2_file_link_info info;
1899         void **data;
1900         unsigned int size[2];
1901         int rc;
1902         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1903
1904         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1905         if (!data)
1906                 return -ENOMEM;
1907
1908         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1909                               /* 0 = fail if link already exists */
1910         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1911         info.FileNameLength = cpu_to_le32(len);
1912
1913         data[0] = &info;
1914         size[0] = sizeof(struct smb2_file_link_info);
1915
1916         data[1] = target_file;
1917         size[1] = len + 2 /* null */;
1918
1919         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1920                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1921         kfree(data);
1922         return rc;
1923 }
1924
1925 int
1926 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1927              u64 volatile_fid, u32 pid, __le64 *eof)
1928 {
1929         struct smb2_file_eof_info info;
1930         void *data;
1931         unsigned int size;
1932
1933         info.EndOfFile = *eof;
1934
1935         data = &info;
1936         size = sizeof(struct smb2_file_eof_info);
1937
1938         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1939                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1940 }
1941
1942 int
1943 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1944               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
1945 {
1946         unsigned int size;
1947         size = sizeof(FILE_BASIC_INFO);
1948         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
1949                              current->tgid, FILE_BASIC_INFORMATION, 1,
1950                              (void **)&buf, &size);
1951 }
1952
1953 int
1954 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
1955                   const u64 persistent_fid, const u64 volatile_fid,
1956                   __u8 oplock_level)
1957 {
1958         int rc;
1959         struct smb2_oplock_break *req = NULL;
1960
1961         cFYI(1, "SMB2_oplock_break");
1962         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
1963
1964         if (rc)
1965                 return rc;
1966
1967         req->VolatileFid = volatile_fid;
1968         req->PersistentFid = persistent_fid;
1969         req->OplockLevel = oplock_level;
1970         req->hdr.CreditRequest = cpu_to_le16(1);
1971
1972         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
1973         /* SMB2 buffer freed by function above */
1974
1975         if (rc) {
1976                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
1977                 cFYI(1, "Send error in Oplock Break = %d", rc);
1978         }
1979
1980         return rc;
1981 }
1982
1983 static void
1984 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
1985                         struct kstatfs *kst)
1986 {
1987         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
1988                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
1989         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
1990         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
1991         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
1992         return;
1993 }
1994
1995 static int
1996 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
1997                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
1998 {
1999         int rc;
2000         struct smb2_query_info_req *req;
2001
2002         cFYI(1, "Query FSInfo level %d", level);
2003
2004         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2005                 return -EIO;
2006
2007         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2008         if (rc)
2009                 return rc;
2010
2011         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2012         req->FileInfoClass = level;
2013         req->PersistentFileId = persistent_fid;
2014         req->VolatileFileId = volatile_fid;
2015         /* 4 for rfc1002 length field and 1 for pad */
2016         req->InputBufferOffset =
2017                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2018         req->OutputBufferLength = cpu_to_le32(
2019                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2020
2021         iov->iov_base = (char *)req;
2022         /* 4 for rfc1002 length field */
2023         iov->iov_len = get_rfc1002_length(req) + 4;
2024         return 0;
2025 }
2026
2027 int
2028 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2029               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2030 {
2031         struct smb2_query_info_rsp *rsp = NULL;
2032         struct kvec iov;
2033         int rc = 0;
2034         int resp_buftype;
2035         struct cifs_ses *ses = tcon->ses;
2036         struct smb2_fs_full_size_info *info = NULL;
2037
2038         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2039                                 sizeof(struct smb2_fs_full_size_info),
2040                                 persistent_fid, volatile_fid);
2041         if (rc)
2042                 return rc;
2043
2044         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2045         if (rc) {
2046                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2047                 goto qinf_exit;
2048         }
2049         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2050
2051         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2052                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2053         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2054                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2055                           sizeof(struct smb2_fs_full_size_info));
2056         if (!rc)
2057                 copy_fs_info_to_kstatfs(info, fsdata);
2058
2059 qinf_exit:
2060         free_rsp_buf(resp_buftype, iov.iov_base);
2061         return rc;
2062 }