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
  49 /*
  50  *  The following table defines the expected "StructureSize" of SMB2 requests
  51  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  52  *
  53  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  54  *  indexed by command in host byte order.
  55  */
  56 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  57         /* SMB2_NEGOTIATE */ 36,
  58         /* SMB2_SESSION_SETUP */ 25,
  59         /* SMB2_LOGOFF */ 4,
  60         /* SMB2_TREE_CONNECT */ 9,
  61         /* SMB2_TREE_DISCONNECT */ 4,
  62         /* SMB2_CREATE */ 57,
  63         /* SMB2_CLOSE */ 24,
  64         /* SMB2_FLUSH */ 24,
  65         /* SMB2_READ */ 49,
  66         /* SMB2_WRITE */ 49,
  67         /* SMB2_LOCK */ 48,
  68         /* SMB2_IOCTL */ 57,
  69         /* SMB2_CANCEL */ 4,
  70         /* SMB2_ECHO */ 4,
  71         /* SMB2_QUERY_DIRECTORY */ 33,
  72         /* SMB2_CHANGE_NOTIFY */ 32,
  73         /* SMB2_QUERY_INFO */ 41,
  74         /* SMB2_SET_INFO */ 33,
  75         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  76 };
  77
  78
  79 static void
  80 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  81                   const struct cifs_tcon *tcon)
  82 {
  83         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  84         char *temp = (char *)hdr;
  85         /* lookup word count ie StructureSize from table */
  86         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  87
  88         /*
  89          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  90          * largest operations (Create)
  91          */
  92         memset(temp, 0, 256);
  93
  94         /* Note this is only network field converted to big endian */
  95         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  96                         - 4 /*  RFC 1001 length field itself not counted */);
  97
  98         hdr->ProtocolId[0] = 0xFE;
  99         hdr->ProtocolId[1] = 'S';
 100         hdr->ProtocolId[2] = 'M';
 101         hdr->ProtocolId[3] = 'B';
 102         hdr->StructureSize = cpu_to_le16(64);
 103         hdr->Command = smb2_cmd;
 104         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 105         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 106
 107         if (!tcon)
 108                 goto out;
 109
 110         hdr->TreeId = tcon->tid;
 111         /* Uid is not converted */
 112         if (tcon->ses)
 113                 hdr->SessionId = tcon->ses->Suid;
 114         /* BB check following DFS flags BB */
 115         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
 116         if (tcon->share_flags & SHI1005_FLAGS_DFS)
 117                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
 118         /* BB how does SMB2 do case sensitive? */
 119         /* if (tcon->nocase)
 120                 hdr->Flags |= SMBFLG_CASELESS; */
 121         /* if (tcon->ses && tcon->ses->server &&
 122             (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
 123                 hdr->Flags |= SMB2_FLAGS_SIGNED; */
 124 out:
 125         pdu->StructureSize2 = cpu_to_le16(parmsize);
 126         return;
 127 }
 128
 129 static int
 130 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 131 {
 132         int rc = 0;
 133         struct nls_table *nls_codepage;
 134         struct cifs_ses *ses;
 135         struct TCP_Server_Info *server;
 136
 137         /*
 138          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 139          * check for tcp and smb session status done differently
 140          * for those three - in the calling routine.
 141          */
 142         if (tcon == NULL)
 143                 return rc;
 144
 145         if (smb2_command == SMB2_TREE_CONNECT)
 146                 return rc;
 147
 148         if (tcon->tidStatus == CifsExiting) {
 149                 /*
 150                  * only tree disconnect, open, and write,
 151                  * (and ulogoff which does not have tcon)
 152                  * are allowed as we start force umount.
 153                  */
 154                 if ((smb2_command != SMB2_WRITE) &&
 155                    (smb2_command != SMB2_CREATE) &&
 156                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 157                         cFYI(1, "can not send cmd %d while umounting",
 158                                 smb2_command);
 159                         return -ENODEV;
 160                 }
 161         }
 162         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 163             (!tcon->ses->server))
 164                 return -EIO;
 165
 166         ses = tcon->ses;
 167         server = ses->server;
 168
 169         /*
 170          * Give demultiplex thread up to 10 seconds to reconnect, should be
 171          * greater than cifs socket timeout which is 7 seconds
 172          */
 173         while (server->tcpStatus == CifsNeedReconnect) {
 174                 /*
 175                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 176                  * here since they are implicitly done when session drops.
 177                  */
 178                 switch (smb2_command) {
 179                 /*
 180                  * BB Should we keep oplock break and add flush to exceptions?
 181                  */
 182                 case SMB2_TREE_DISCONNECT:
 183                 case SMB2_CANCEL:
 184                 case SMB2_CLOSE:
 185                 case SMB2_OPLOCK_BREAK:
 186                         return -EAGAIN;
 187                 }
 188
 189                 wait_event_interruptible_timeout(server->response_q,
 190                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 191
 192                 /* are we still trying to reconnect? */
 193                 if (server->tcpStatus != CifsNeedReconnect)
 194                         break;
 195
 196                 /*
 197                  * on "soft" mounts we wait once. Hard mounts keep
 198                  * retrying until process is killed or server comes
 199                  * back on-line
 200                  */
 201                 if (!tcon->retry) {
 202                         cFYI(1, "gave up waiting on reconnect in smb_init");
 203                         return -EHOSTDOWN;
 204                 }
 205         }
 206
 207         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 208                 return rc;
 209
 210         nls_codepage = load_nls_default();
 211
 212         /*
 213          * need to prevent multiple threads trying to simultaneously reconnect
 214          * the same SMB session
 215          */
 216         mutex_lock(&tcon->ses->session_mutex);
 217         rc = cifs_negotiate_protocol(0, tcon->ses);
 218         if (!rc && tcon->ses->need_reconnect)
 219                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 220
 221         if (rc || !tcon->need_reconnect) {
 222                 mutex_unlock(&tcon->ses->session_mutex);
 223                 goto out;
 224         }
 225
 226         cifs_mark_open_files_invalid(tcon);
 227         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 228         mutex_unlock(&tcon->ses->session_mutex);
 229         cFYI(1, "reconnect tcon rc = %d", rc);
 230         if (rc)
 231                 goto out;
 232         atomic_inc(&tconInfoReconnectCount);
 233         /*
 234          * BB FIXME add code to check if wsize needs update due to negotiated
 235          * smb buffer size shrinking.
 236          */
 237 out:
 238         /*
 239          * Check if handle based operation so we know whether we can continue
 240          * or not without returning to caller to reset file handle.
 241          */
 242         /*
 243          * BB Is flush done by server on drop of tcp session? Should we special
 244          * case it and skip above?
 245          */
 246         switch (smb2_command) {
 247         case SMB2_FLUSH:
 248         case SMB2_READ:
 249         case SMB2_WRITE:
 250         case SMB2_LOCK:
 251         case SMB2_IOCTL:
 252         case SMB2_QUERY_DIRECTORY:
 253         case SMB2_CHANGE_NOTIFY:
 254         case SMB2_QUERY_INFO:
 255         case SMB2_SET_INFO:
 256                 return -EAGAIN;
 257         }
 258         unload_nls(nls_codepage);
 259         return rc;
 260 }
 261
 262 /*
 263  * Allocate and return pointer to an SMB request hdr, and set basic
 264  * SMB information in the SMB header. If the return code is zero, this
 265  * function must have filled in request_buf pointer.
 266  */
 267 static int
 268 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 269                 void **request_buf)
 270 {
 271         int rc = 0;
 272
 273         rc = smb2_reconnect(smb2_command, tcon);
 274         if (rc)
 275                 return rc;
 276
 277         /* BB eventually switch this to SMB2 specific small buf size */
 278         *request_buf = cifs_small_buf_get();
 279         if (*request_buf == NULL) {
 280                 /* BB should we add a retry in here if not a writepage? */
 281                 return -ENOMEM;
 282         }
 283
 284         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 285
 286         if (tcon != NULL) {
 287 #ifdef CONFIG_CIFS_STATS2
 288                 uint16_t com_code = le16_to_cpu(smb2_command);
 289                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 290 #endif
 291                 cifs_stats_inc(&tcon->num_smbs_sent);
 292         }
 293
 294         return rc;
 295 }
 296
 297 static void
 298 free_rsp_buf(int resp_buftype, void *rsp)
 299 {
 300         if (resp_buftype == CIFS_SMALL_BUFFER)
 301                 cifs_small_buf_release(rsp);
 302         else if (resp_buftype == CIFS_LARGE_BUFFER)
 303                 cifs_buf_release(rsp);
 304 }
 305
 306 #define SMB2_NUM_PROT 1
 307
 308 #define SMB2_PROT   0
 309 #define SMB21_PROT  1
 310 #define BAD_PROT 0xFFFF
 311
 312 #define SMB2_PROT_ID  0x0202
 313 #define SMB21_PROT_ID 0x0210
 314 #define BAD_PROT_ID   0xFFFF
 315
 316 static struct {
 317         int index;
 318         __le16 name;
 319 } smb2protocols[] = {
 320         {SMB2_PROT,  cpu_to_le16(SMB2_PROT_ID)},
 321         {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
 322         {BAD_PROT,   cpu_to_le16(BAD_PROT_ID)}
 323 };
 324
 325 /*
 326  *
 327  *      SMB2 Worker functions follow:
 328  *
 329  *      The general structure of the worker functions is:
 330  *      1) Call smb2_init (assembles SMB2 header)
 331  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 332  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 333  *      4) Decode SMB2 command specific fields in the fixed length area
 334  *      5) Decode variable length data area (if any for this SMB2 command type)
 335  *      6) Call free smb buffer
 336  *      7) return
 337  *
 338  */
 339
 340 int
 341 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 342 {
 343         struct smb2_negotiate_req *req;
 344         struct smb2_negotiate_rsp *rsp;
 345         struct kvec iov[1];
 346         int rc = 0;
 347         int resp_buftype;
 348         struct TCP_Server_Info *server;
 349         unsigned int sec_flags;
 350         u16 i;
 351         u16 temp = 0;
 352         int blob_offset, blob_length;
 353         char *security_blob;
 354         int flags = CIFS_NEG_OP;
 355
 356         cFYI(1, "Negotiate protocol");
 357
 358         if (ses->server)
 359                 server = ses->server;
 360         else {
 361                 rc = -EIO;
 362                 return rc;
 363         }
 364
 365         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 366         if (rc)
 367                 return rc;
 368
 369         /* if any of auth flags (ie not sign or seal) are overriden use them */
 370         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 371                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 372         else /* if override flags set only sign/seal OR them with global auth */
 373                 sec_flags = global_secflags | ses->overrideSecFlg;
 374
 375         cFYI(1, "sec_flags 0x%x", sec_flags);
 376
 377         req->hdr.SessionId = 0;
 378
 379         for (i = 0; i < SMB2_NUM_PROT; i++)
 380                 req->Dialects[i] = smb2protocols[i].name;
 381
 382         req->DialectCount = cpu_to_le16(i);
 383         inc_rfc1001_len(req, i * 2);
 384
 385         /* only one of SMB2 signing flags may be set in SMB2 request */
 386         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 387                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 388         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 389                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 390
 391         req->SecurityMode = cpu_to_le16(temp);
 392
 393         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
 394
 395         iov[0].iov_base = (char *)req;
 396         /* 4 for rfc1002 length field */
 397         iov[0].iov_len = get_rfc1002_length(req) + 4;
 398
 399         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 400
 401         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 402         /*
 403          * No tcon so can't do
 404          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 405          */
 406         if (rc != 0)
 407                 goto neg_exit;
 408
 409         if (rsp == NULL) {
 410                 rc = -EIO;
 411                 goto neg_exit;
 412         }
 413
 414         cFYI(1, "mode 0x%x", rsp->SecurityMode);
 415
 416         if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
 417                 cFYI(1, "negotiated smb2.1 dialect");
 418         else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
 419                 cFYI(1, "negotiated smb2 dialect");
 420         else {
 421                 cERROR(1, "Illegal dialect returned by server %d",
 422                            le16_to_cpu(rsp->DialectRevision));
 423                 rc = -EIO;
 424                 goto neg_exit;
 425         }
 426         server->dialect = le16_to_cpu(rsp->DialectRevision);
 427
 428         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 429         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 430         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 431         /* BB Do we need to validate the SecurityMode? */
 432         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 433         server->capabilities = le32_to_cpu(rsp->Capabilities);
 434         /* Internal types */
 435         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 436
 437         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 438                                                &rsp->hdr);
 439         if (blob_length == 0) {
 440                 cERROR(1, "missing security blob on negprot");
 441                 rc = -EIO;
 442                 goto neg_exit;
 443         }
 444 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 445         rc = decode_neg_token_init(security_blob, blob_length,
 446                                    &server->sec_type);
 447         if (rc == 1)
 448                 rc = 0;
 449         else if (rc == 0) {
 450                 rc = -EIO;
 451                 goto neg_exit;
 452         }
 453 #endif
 454
 455 neg_exit:
 456         free_rsp_buf(resp_buftype, rsp);
 457         return rc;
 458 }
 459
 460 int
 461 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 462                 const struct nls_table *nls_cp)
 463 {
 464         struct smb2_sess_setup_req *req;
 465         struct smb2_sess_setup_rsp *rsp = NULL;
 466         struct kvec iov[2];
 467         int rc = 0;
 468         int resp_buftype;
 469         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 470         struct TCP_Server_Info *server;
 471         unsigned int sec_flags;
 472         u8 temp = 0;
 473         u16 blob_length = 0;
 474         char *security_blob;
 475         char *ntlmssp_blob = NULL;
 476         bool use_spnego = false; /* else use raw ntlmssp */
 477
 478         cFYI(1, "Session Setup");
 479
 480         if (ses->server)
 481                 server = ses->server;
 482         else {
 483                 rc = -EIO;
 484                 return rc;
 485         }
 486
 487         /*
 488          * If memory allocation is successful, caller of this function
 489          * frees it.
 490          */
 491         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 492         if (!ses->ntlmssp)
 493                 return -ENOMEM;
 494
 495         ses->server->secType = RawNTLMSSP;
 496
 497 ssetup_ntlmssp_authenticate:
 498         if (phase == NtLmChallenge)
 499                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 500
 501         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 502         if (rc)
 503                 return rc;
 504
 505         /* if any of auth flags (ie not sign or seal) are overriden use them */
 506         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 507                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 508         else /* if override flags set only sign/seal OR them with global auth */
 509                 sec_flags = global_secflags | ses->overrideSecFlg;
 510
 511         cFYI(1, "sec_flags 0x%x", sec_flags);
 512
 513         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 514         req->VcNumber = 0; /* MBZ */
 515         /* to enable echos and oplocks */
 516         req->hdr.CreditRequest = cpu_to_le16(3);
 517
 518         /* only one of SMB2 signing flags may be set in SMB2 request */
 519         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 520                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 521         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 522                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 523         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 524                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 525
 526         req->SecurityMode = temp;
 527         req->Capabilities = 0;
 528         req->Channel = 0; /* MBZ */
 529
 530         iov[0].iov_base = (char *)req;
 531         /* 4 for rfc1002 length field and 1 for pad */
 532         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 533         if (phase == NtLmNegotiate) {
 534                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 535                                        GFP_KERNEL);
 536                 if (ntlmssp_blob == NULL) {
 537                         rc = -ENOMEM;
 538                         goto ssetup_exit;
 539                 }
 540                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 541                 if (use_spnego) {
 542                         /* blob_length = build_spnego_ntlmssp_blob(
 543                                         &security_blob,
 544                                         sizeof(struct _NEGOTIATE_MESSAGE),
 545                                         ntlmssp_blob); */
 546                         /* BB eventually need to add this */
 547                         cERROR(1, "spnego not supported for SMB2 yet");
 548                         rc = -EOPNOTSUPP;
 549                         kfree(ntlmssp_blob);
 550                         goto ssetup_exit;
 551                 } else {
 552                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 553                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 554                         security_blob = ntlmssp_blob;
 555                 }
 556         } else if (phase == NtLmAuthenticate) {
 557                 req->hdr.SessionId = ses->Suid;
 558                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 559                                        GFP_KERNEL);
 560                 if (ntlmssp_blob == NULL) {
 561                         cERROR(1, "failed to malloc ntlmssp blob");
 562                         rc = -ENOMEM;
 563                         goto ssetup_exit;
 564                 }
 565                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 566                                              nls_cp);
 567                 if (rc) {
 568                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
 569                         goto ssetup_exit; /* BB double check error handling */
 570                 }
 571                 if (use_spnego) {
 572                         /* blob_length = build_spnego_ntlmssp_blob(
 573                                                         &security_blob,
 574                                                         blob_length,
 575                                                         ntlmssp_blob); */
 576                         cERROR(1, "spnego not supported for SMB2 yet");
 577                         rc = -EOPNOTSUPP;
 578                         kfree(ntlmssp_blob);
 579                         goto ssetup_exit;
 580                 } else {
 581                         security_blob = ntlmssp_blob;
 582                 }
 583         } else {
 584                 cERROR(1, "illegal ntlmssp phase");
 585                 rc = -EIO;
 586                 goto ssetup_exit;
 587         }
 588
 589         /* Testing shows that buffer offset must be at location of Buffer[0] */
 590         req->SecurityBufferOffset =
 591                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 592                                             1 /* pad */ - 4 /* rfc1001 len */);
 593         req->SecurityBufferLength = cpu_to_le16(blob_length);
 594         iov[1].iov_base = security_blob;
 595         iov[1].iov_len = blob_length;
 596
 597         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 598
 599         /* BB add code to build os and lm fields */
 600
 601         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
 602
 603         kfree(security_blob);
 604         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 605         if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 606                 if (phase != NtLmNegotiate) {
 607                         cERROR(1, "Unexpected more processing error");
 608                         goto ssetup_exit;
 609                 }
 610                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 611                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 612                         cERROR(1, "Invalid security buffer offset %d",
 613                                   le16_to_cpu(rsp->SecurityBufferOffset));
 614                         rc = -EIO;
 615                         goto ssetup_exit;
 616                 }
 617
 618                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 619                 phase = NtLmChallenge; /* process ntlmssp challenge */
 620                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 621                 ses->Suid = rsp->hdr.SessionId;
 622                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 623                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 624         }
 625
 626         /*
 627          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 628          * but at least the raw NTLMSSP case works.
 629          */
 630         /*
 631          * No tcon so can't do
 632          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 633          */
 634         if (rc != 0)
 635                 goto ssetup_exit;
 636
 637         if (rsp == NULL) {
 638                 rc = -EIO;
 639                 goto ssetup_exit;
 640         }
 641
 642         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 643 ssetup_exit:
 644         free_rsp_buf(resp_buftype, rsp);
 645
 646         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 647         if ((phase == NtLmChallenge) && (rc == 0))
 648                 goto ssetup_ntlmssp_authenticate;
 649         return rc;
 650 }
 651
 652 int
 653 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 654 {
 655         struct smb2_logoff_req *req; /* response is also trivial struct */
 656         int rc = 0;
 657         struct TCP_Server_Info *server;
 658
 659         cFYI(1, "disconnect session %p", ses);
 660
 661         if (ses && (ses->server))
 662                 server = ses->server;
 663         else
 664                 return -EIO;
 665
 666         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 667         if (rc)
 668                 return rc;
 669
 670          /* since no tcon, smb2_init can not do this, so do here */
 671         req->hdr.SessionId = ses->Suid;
 672
 673         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 674         /*
 675          * No tcon so can't do
 676          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 677          */
 678         return rc;
 679 }
 680
 681 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 682 {
 683         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 684 }
 685
 686 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 687
 688 int
 689 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 690           struct cifs_tcon *tcon, const struct nls_table *cp)
 691 {
 692         struct smb2_tree_connect_req *req;
 693         struct smb2_tree_connect_rsp *rsp = NULL;
 694         struct kvec iov[2];
 695         int rc = 0;
 696         int resp_buftype;
 697         int unc_path_len;
 698         struct TCP_Server_Info *server;
 699         __le16 *unc_path = NULL;
 700
 701         cFYI(1, "TCON");
 702
 703         if ((ses->server) && tree)
 704                 server = ses->server;
 705         else
 706                 return -EIO;
 707
 708         if (tcon && tcon->bad_network_name)
 709                 return -ENOENT;
 710
 711         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 712         if (unc_path == NULL)
 713                 return -ENOMEM;
 714
 715         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 716         unc_path_len *= 2;
 717         if (unc_path_len < 2) {
 718                 kfree(unc_path);
 719                 return -EINVAL;
 720         }
 721
 722         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 723         if (rc) {
 724                 kfree(unc_path);
 725                 return rc;
 726         }
 727
 728         if (tcon == NULL) {
 729                 /* since no tcon, smb2_init can not do this, so do here */
 730                 req->hdr.SessionId = ses->Suid;
 731                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 732                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 733         }
 734
 735         iov[0].iov_base = (char *)req;
 736         /* 4 for rfc1002 length field and 1 for pad */
 737         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 738
 739         /* Testing shows that buffer offset must be at location of Buffer[0] */
 740         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 741                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 742         req->PathLength = cpu_to_le16(unc_path_len - 2);
 743         iov[1].iov_base = unc_path;
 744         iov[1].iov_len = unc_path_len;
 745
 746         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 747
 748         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 749         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 750
 751         if (rc != 0) {
 752                 if (tcon) {
 753                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 754                         tcon->need_reconnect = true;
 755                 }
 756                 goto tcon_error_exit;
 757         }
 758
 759         if (rsp == NULL) {
 760                 rc = -EIO;
 761                 goto tcon_exit;
 762         }
 763
 764         if (tcon == NULL) {
 765                 ses->ipc_tid = rsp->hdr.TreeId;
 766                 goto tcon_exit;
 767         }
 768
 769         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 770                 cFYI(1, "connection to disk share");
 771         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 772                 tcon->ipc = true;
 773                 cFYI(1, "connection to pipe share");
 774         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 775                 tcon->print = true;
 776                 cFYI(1, "connection to printer");
 777         } else {
 778                 cERROR(1, "unknown share type %d", rsp->ShareType);
 779                 rc = -EOPNOTSUPP;
 780                 goto tcon_error_exit;
 781         }
 782
 783         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 784         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 785         tcon->tidStatus = CifsGood;
 786         tcon->need_reconnect = false;
 787         tcon->tid = rsp->hdr.TreeId;
 788         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 789
 790         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 791             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 792                 cERROR(1, "DFS capability contradicts DFS flag");
 793
 794 tcon_exit:
 795         free_rsp_buf(resp_buftype, rsp);
 796         kfree(unc_path);
 797         return rc;
 798
 799 tcon_error_exit:
 800         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 801                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
 802                 tcon->bad_network_name = true;
 803         }
 804         goto tcon_exit;
 805 }
 806
 807 int
 808 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 809 {
 810         struct smb2_tree_disconnect_req *req; /* response is trivial */
 811         int rc = 0;
 812         struct TCP_Server_Info *server;
 813         struct cifs_ses *ses = tcon->ses;
 814
 815         cFYI(1, "Tree Disconnect");
 816
 817         if (ses && (ses->server))
 818                 server = ses->server;
 819         else
 820                 return -EIO;
 821
 822         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 823                 return 0;
 824
 825         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 826         if (rc)
 827                 return rc;
 828
 829         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 830         if (rc)
 831                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 832
 833         return rc;
 834 }
 835
 836 int
 837 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 838           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 839           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 840           struct smb2_file_all_info *buf)
 841 {
 842         struct smb2_create_req *req;
 843         struct smb2_create_rsp *rsp;
 844         struct TCP_Server_Info *server;
 845         struct cifs_ses *ses = tcon->ses;
 846         struct kvec iov[2];
 847         int resp_buftype;
 848         int uni_path_len;
 849         int rc = 0;
 850         int num_iovecs = 2;
 851
 852         cFYI(1, "create/open");
 853
 854         if (ses && (ses->server))
 855                 server = ses->server;
 856         else
 857                 return -EIO;
 858
 859         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 860         if (rc)
 861                 return rc;
 862
 863         /* if (server->oplocks)
 864                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
 865         else */
 866                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
 867         req->ImpersonationLevel = IL_IMPERSONATION;
 868         req->DesiredAccess = cpu_to_le32(desired_access);
 869         /* File attributes ignored on open (used in create though) */
 870         req->FileAttributes = cpu_to_le32(file_attributes);
 871         req->ShareAccess = FILE_SHARE_ALL_LE;
 872         req->CreateDisposition = cpu_to_le32(create_disposition);
 873         req->CreateOptions = cpu_to_le32(create_options);
 874         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 875         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 876                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 877
 878         iov[0].iov_base = (char *)req;
 879         /* 4 for rfc1002 length field */
 880         iov[0].iov_len = get_rfc1002_length(req) + 4;
 881
 882         /* MUST set path len (NameLength) to 0 opening root of share */
 883         if (uni_path_len >= 4) {
 884                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 885                 /* -1 since last byte is buf[0] which is sent below (path) */
 886                 iov[0].iov_len--;
 887                 iov[1].iov_len = uni_path_len;
 888                 iov[1].iov_base = path;
 889                 /*
 890                  * -1 since last byte is buf[0] which was counted in
 891                  * smb2_buf_len.
 892                  */
 893                 inc_rfc1001_len(req, uni_path_len - 1);
 894         } else {
 895                 num_iovecs = 1;
 896                 req->NameLength = 0;
 897         }
 898
 899         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 900         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 901
 902         if (rc != 0) {
 903                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 904                 goto creat_exit;
 905         }
 906
 907         if (rsp == NULL) {
 908                 rc = -EIO;
 909                 goto creat_exit;
 910         }
 911         *persistent_fid = rsp->PersistentFileId;
 912         *volatile_fid = rsp->VolatileFileId;
 913
 914         if (buf) {
 915                 memcpy(buf, &rsp->CreationTime, 32);
 916                 buf->AllocationSize = rsp->AllocationSize;
 917                 buf->EndOfFile = rsp->EndofFile;
 918                 buf->Attributes = rsp->FileAttributes;
 919                 buf->NumberOfLinks = cpu_to_le32(1);
 920                 buf->DeletePending = 0;
 921         }
 922 creat_exit:
 923         free_rsp_buf(resp_buftype, rsp);
 924         return rc;
 925 }
 926
 927 int
 928 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
 929            u64 persistent_fid, u64 volatile_fid)
 930 {
 931         struct smb2_close_req *req;
 932         struct smb2_close_rsp *rsp;
 933         struct TCP_Server_Info *server;
 934         struct cifs_ses *ses = tcon->ses;
 935         struct kvec iov[1];
 936         int resp_buftype;
 937         int rc = 0;
 938
 939         cFYI(1, "Close");
 940
 941         if (ses && (ses->server))
 942                 server = ses->server;
 943         else
 944                 return -EIO;
 945
 946         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
 947         if (rc)
 948                 return rc;
 949
 950         req->PersistentFileId = persistent_fid;
 951         req->VolatileFileId = volatile_fid;
 952
 953         iov[0].iov_base = (char *)req;
 954         /* 4 for rfc1002 length field */
 955         iov[0].iov_len = get_rfc1002_length(req) + 4;
 956
 957         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
 958         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
 959
 960         if (rc != 0) {
 961                 if (tcon)
 962                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
 963                 goto close_exit;
 964         }
 965
 966         if (rsp == NULL) {
 967                 rc = -EIO;
 968                 goto close_exit;
 969         }
 970
 971         /* BB FIXME - decode close response, update inode for caching */
 972
 973 close_exit:
 974         free_rsp_buf(resp_buftype, rsp);
 975         return rc;
 976 }
 977
 978 static int
 979 validate_buf(unsigned int offset, unsigned int buffer_length,
 980              struct smb2_hdr *hdr, unsigned int min_buf_size)
 981
 982 {
 983         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
 984         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
 985         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
 986         char *end_of_buf = begin_of_buf + buffer_length;
 987
 988
 989         if (buffer_length < min_buf_size) {
 990                 cERROR(1, "buffer length %d smaller than minimum size %d",
 991                            buffer_length, min_buf_size);
 992                 return -EINVAL;
 993         }
 994
 995         /* check if beyond RFC1001 maximum length */
 996         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
 997                 cERROR(1, "buffer length %d or smb length %d too large",
 998                            buffer_length, smb_len);
 999                 return -EINVAL;
1000         }
1001
1002         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1003                 cERROR(1, "illegal server response, bad offset to data");
1004                 return -EINVAL;
1005         }
1006
1007         return 0;
1008 }
1009
1010 /*
1011  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1012  * Caller must free buffer.
1013  */
1014 static int
1015 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1016                       struct smb2_hdr *hdr, unsigned int minbufsize,
1017                       char *data)
1018
1019 {
1020         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1021         int rc;
1022
1023         if (!data)
1024                 return -EINVAL;
1025
1026         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1027         if (rc)
1028                 return rc;
1029
1030         memcpy(data, begin_of_buf, buffer_length);
1031
1032         return 0;
1033 }
1034
1035 static int
1036 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1037            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1038            size_t output_len, size_t min_len, void *data)
1039 {
1040         struct smb2_query_info_req *req;
1041         struct smb2_query_info_rsp *rsp = NULL;
1042         struct kvec iov[2];
1043         int rc = 0;
1044         int resp_buftype;
1045         struct TCP_Server_Info *server;
1046         struct cifs_ses *ses = tcon->ses;
1047
1048         cFYI(1, "Query Info");
1049
1050         if (ses && (ses->server))
1051                 server = ses->server;
1052         else
1053                 return -EIO;
1054
1055         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1056         if (rc)
1057                 return rc;
1058
1059         req->InfoType = SMB2_O_INFO_FILE;
1060         req->FileInfoClass = info_class;
1061         req->PersistentFileId = persistent_fid;
1062         req->VolatileFileId = volatile_fid;
1063         /* 4 for rfc1002 length field and 1 for Buffer */
1064         req->InputBufferOffset =
1065                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1066         req->OutputBufferLength = cpu_to_le32(output_len);
1067
1068         iov[0].iov_base = (char *)req;
1069         /* 4 for rfc1002 length field */
1070         iov[0].iov_len = get_rfc1002_length(req) + 4;
1071
1072         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1073         if (rc) {
1074                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1075                 goto qinf_exit;
1076         }
1077
1078         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1079
1080         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1081                                    le32_to_cpu(rsp->OutputBufferLength),
1082                                    &rsp->hdr, min_len, data);
1083
1084 qinf_exit:
1085         free_rsp_buf(resp_buftype, rsp);
1086         return rc;
1087 }
1088
1089 int
1090 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1091                 u64 persistent_fid, u64 volatile_fid,
1092                 struct smb2_file_all_info *data)
1093 {
1094         return query_info(xid, tcon, persistent_fid, volatile_fid,
1095                           FILE_ALL_INFORMATION,
1096                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1097                           sizeof(struct smb2_file_all_info), data);
1098 }
1099
1100 int
1101 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1102                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1103 {
1104         return query_info(xid, tcon, persistent_fid, volatile_fid,
1105                           FILE_INTERNAL_INFORMATION,
1106                           sizeof(struct smb2_file_internal_info),
1107                           sizeof(struct smb2_file_internal_info), uniqueid);
1108 }
1109
1110 /*
1111  * This is a no-op for now. We're not really interested in the reply, but
1112  * rather in the fact that the server sent one and that server->lstrp
1113  * gets updated.
1114  *
1115  * FIXME: maybe we should consider checking that the reply matches request?
1116  */
1117 static void
1118 smb2_echo_callback(struct mid_q_entry *mid)
1119 {
1120         struct TCP_Server_Info *server = mid->callback_data;
1121         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1122         unsigned int credits_received = 1;
1123
1124         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1125                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1126
1127         DeleteMidQEntry(mid);
1128         add_credits(server, credits_received, CIFS_ECHO_OP);
1129 }
1130
1131 int
1132 SMB2_echo(struct TCP_Server_Info *server)
1133 {
1134         struct smb2_echo_req *req;
1135         int rc = 0;
1136         struct kvec iov;
1137
1138         cFYI(1, "In echo request");
1139
1140         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1141         if (rc)
1142                 return rc;
1143
1144         req->hdr.CreditRequest = cpu_to_le16(1);
1145
1146         iov.iov_base = (char *)req;
1147         /* 4 for rfc1002 length field */
1148         iov.iov_len = get_rfc1002_length(req) + 4;
1149
1150         rc = cifs_call_async(server, &iov, 1, NULL, smb2_echo_callback, server,
1151                              CIFS_ECHO_OP);
1152         if (rc)
1153                 cFYI(1, "Echo request failed: %d", rc);
1154
1155         cifs_small_buf_release(req);
1156         return rc;
1157 }
1158
1159 int
1160 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1161            u64 volatile_fid)
1162 {
1163         struct smb2_flush_req *req;
1164         struct TCP_Server_Info *server;
1165         struct cifs_ses *ses = tcon->ses;
1166         struct kvec iov[1];
1167         int resp_buftype;
1168         int rc = 0;
1169
1170         cFYI(1, "Flush");
1171
1172         if (ses && (ses->server))
1173                 server = ses->server;
1174         else
1175                 return -EIO;
1176
1177         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1178         if (rc)
1179                 return rc;
1180
1181         req->PersistentFileId = persistent_fid;
1182         req->VolatileFileId = volatile_fid;
1183
1184         iov[0].iov_base = (char *)req;
1185         /* 4 for rfc1002 length field */
1186         iov[0].iov_len = get_rfc1002_length(req) + 4;
1187
1188         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1189
1190         if ((rc != 0) && tcon)
1191                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1192
1193         free_rsp_buf(resp_buftype, iov[0].iov_base);
1194         return rc;
1195 }
1196
1197 /*
1198  * To form a chain of read requests, any read requests after the first should
1199  * have the end_of_chain boolean set to true.
1200  */
1201 static int
1202 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1203                   unsigned int remaining_bytes, int request_type)
1204 {
1205         int rc = -EACCES;
1206         struct smb2_read_req *req = NULL;
1207
1208         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1209         if (rc)
1210                 return rc;
1211         if (io_parms->tcon->ses->server == NULL)
1212                 return -ECONNABORTED;
1213
1214         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1215
1216         req->PersistentFileId = io_parms->persistent_fid;
1217         req->VolatileFileId = io_parms->volatile_fid;
1218         req->ReadChannelInfoOffset = 0; /* reserved */
1219         req->ReadChannelInfoLength = 0; /* reserved */
1220         req->Channel = 0; /* reserved */
1221         req->MinimumCount = 0;
1222         req->Length = cpu_to_le32(io_parms->length);
1223         req->Offset = cpu_to_le64(io_parms->offset);
1224
1225         if (request_type & CHAINED_REQUEST) {
1226                 if (!(request_type & END_OF_CHAIN)) {
1227                         /* 4 for rfc1002 length field */
1228                         req->hdr.NextCommand =
1229                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1230                 } else /* END_OF_CHAIN */
1231                         req->hdr.NextCommand = 0;
1232                 if (request_type & RELATED_REQUEST) {
1233                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1234                         /*
1235                          * Related requests use info from previous read request
1236                          * in chain.
1237                          */
1238                         req->hdr.SessionId = 0xFFFFFFFF;
1239                         req->hdr.TreeId = 0xFFFFFFFF;
1240                         req->PersistentFileId = 0xFFFFFFFF;
1241                         req->VolatileFileId = 0xFFFFFFFF;
1242                 }
1243         }
1244         if (remaining_bytes > io_parms->length)
1245                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1246         else
1247                 req->RemainingBytes = 0;
1248
1249         iov[0].iov_base = (char *)req;
1250         /* 4 for rfc1002 length field */
1251         iov[0].iov_len = get_rfc1002_length(req) + 4;
1252         return rc;
1253 }
1254
1255 static void
1256 smb2_readv_callback(struct mid_q_entry *mid)
1257 {
1258         struct cifs_readdata *rdata = mid->callback_data;
1259         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1260         struct TCP_Server_Info *server = tcon->ses->server;
1261         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
1262         unsigned int credits_received = 1;
1263
1264         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1265                 mid->mid, mid->mid_state, rdata->result, rdata->bytes);
1266
1267         switch (mid->mid_state) {
1268         case MID_RESPONSE_RECEIVED:
1269                 credits_received = le16_to_cpu(buf->CreditRequest);
1270                 /* result already set, check signature */
1271                 /* if (server->sec_mode &
1272                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1273                         if (smb2_verify_signature(mid->resp_buf, server))
1274                                 cERROR(1, "Unexpected SMB signature"); */
1275                 /* FIXME: should this be counted toward the initiating task? */
1276                 task_io_account_read(rdata->bytes);
1277                 cifs_stats_bytes_read(tcon, rdata->bytes);
1278                 break;
1279         case MID_REQUEST_SUBMITTED:
1280         case MID_RETRY_NEEDED:
1281                 rdata->result = -EAGAIN;
1282                 break;
1283         default:
1284                 if (rdata->result != -ENODATA)
1285                         rdata->result = -EIO;
1286         }
1287
1288         if (rdata->result)
1289                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1290
1291         queue_work(cifsiod_wq, &rdata->work);
1292         DeleteMidQEntry(mid);
1293         add_credits(server, credits_received, 0);
1294 }
1295
1296 /* smb2_async_readv - send an async write, and set up mid to handle result */
1297 int
1298 smb2_async_readv(struct cifs_readdata *rdata)
1299 {
1300         int rc;
1301         struct smb2_hdr *buf;
1302         struct cifs_io_parms io_parms;
1303
1304         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1305                 rdata->offset, rdata->bytes);
1306
1307         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1308         io_parms.offset = rdata->offset;
1309         io_parms.length = rdata->bytes;
1310         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1311         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1312         io_parms.pid = rdata->pid;
1313         rc = smb2_new_read_req(&rdata->iov[0], &io_parms, 0, 0);
1314         if (rc)
1315                 return rc;
1316
1317         buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
1318         /* 4 for rfc1002 length field */
1319         rdata->iov[0].iov_len = get_rfc1002_length(rdata->iov[0].iov_base) + 4;
1320
1321         kref_get(&rdata->refcount);
1322         rc = cifs_call_async(io_parms.tcon->ses->server, rdata->iov, 1,
1323                              cifs_readv_receive, smb2_readv_callback,
1324                              rdata, 0);
1325         if (rc)
1326                 kref_put(&rdata->refcount, cifs_readdata_release);
1327
1328         cifs_small_buf_release(buf);
1329         return rc;
1330 }
1331
1332 int
1333 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1334           unsigned int *nbytes, char **buf, int *buf_type)
1335 {
1336         int resp_buftype, rc = -EACCES;
1337         struct smb2_read_rsp *rsp = NULL;
1338         struct kvec iov[1];
1339
1340         *nbytes = 0;
1341         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1342         if (rc)
1343                 return rc;
1344
1345         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1346                           &resp_buftype, CIFS_LOG_ERROR);
1347
1348         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1349
1350         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1351                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1352                 return 0;
1353         }
1354
1355         if (rc) {
1356                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1357                 cERROR(1, "Send error in read = %d", rc);
1358         } else {
1359                 *nbytes = le32_to_cpu(rsp->DataLength);
1360                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1361                     (*nbytes > io_parms->length)) {
1362                         cFYI(1, "bad length %d for count %d", *nbytes,
1363                                 io_parms->length);
1364                         rc = -EIO;
1365                         *nbytes = 0;
1366                 }
1367         }
1368
1369         if (*buf) {
1370                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1371                        *nbytes);
1372                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1373         } else if (resp_buftype != CIFS_NO_BUFFER) {
1374                 *buf = iov[0].iov_base;
1375                 if (resp_buftype == CIFS_SMALL_BUFFER)
1376                         *buf_type = CIFS_SMALL_BUFFER;
1377                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1378                         *buf_type = CIFS_LARGE_BUFFER;
1379         }
1380         return rc;
1381 }
1382
1383 /*
1384  * Check the mid_state and signature on received buffer (if any), and queue the
1385  * workqueue completion task.
1386  */
1387 static void
1388 smb2_writev_callback(struct mid_q_entry *mid)
1389 {
1390         struct cifs_writedata *wdata = mid->callback_data;
1391         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1392         unsigned int written;
1393         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1394         unsigned int credits_received = 1;
1395
1396         switch (mid->mid_state) {
1397         case MID_RESPONSE_RECEIVED:
1398                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1399                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1400                 if (wdata->result != 0)
1401                         break;
1402
1403                 written = le32_to_cpu(rsp->DataLength);
1404                 /*
1405                  * Mask off high 16 bits when bytes written as returned
1406                  * by the server is greater than bytes requested by the
1407                  * client. OS/2 servers are known to set incorrect
1408                  * CountHigh values.
1409                  */
1410                 if (written > wdata->bytes)
1411                         written &= 0xFFFF;
1412
1413                 if (written < wdata->bytes)
1414                         wdata->result = -ENOSPC;
1415                 else
1416                         wdata->bytes = written;
1417                 break;
1418         case MID_REQUEST_SUBMITTED:
1419         case MID_RETRY_NEEDED:
1420                 wdata->result = -EAGAIN;
1421                 break;
1422         default:
1423                 wdata->result = -EIO;
1424                 break;
1425         }
1426
1427         if (wdata->result)
1428                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1429
1430         queue_work(cifsiod_wq, &wdata->work);
1431         DeleteMidQEntry(mid);
1432         add_credits(tcon->ses->server, credits_received, 0);
1433 }
1434
1435 /* smb2_async_writev - send an async write, and set up mid to handle result */
1436 int
1437 smb2_async_writev(struct cifs_writedata *wdata)
1438 {
1439         int i, rc = -EACCES;
1440         struct smb2_write_req *req = NULL;
1441         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1442         struct kvec *iov = NULL;
1443
1444         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1445         if (rc)
1446                 goto async_writev_out;
1447
1448         /* 1 iov per page + 1 for header */
1449         iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS);
1450         if (iov == NULL) {
1451                 rc = -ENOMEM;
1452                 goto async_writev_out;
1453         }
1454
1455         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1456
1457         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1458         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1459         req->WriteChannelInfoOffset = 0;
1460         req->WriteChannelInfoLength = 0;
1461         req->Channel = 0;
1462         req->Offset = cpu_to_le64(wdata->offset);
1463         /* 4 for rfc1002 length field */
1464         req->DataOffset = cpu_to_le16(
1465                                 offsetof(struct smb2_write_req, Buffer) - 4);
1466         req->RemainingBytes = 0;
1467
1468         /* 4 for rfc1002 length field and 1 for Buffer */
1469         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1470         iov[0].iov_base = (char *)req;
1471
1472         /*
1473          * This function should marshal up the page array into the kvec
1474          * array, reserving [0] for the header. It should kmap the pages
1475          * and set the iov_len properly for each one. It may also set
1476          * wdata->bytes too.
1477          */
1478         cifs_kmap_lock();
1479         wdata->marshal_iov(iov, wdata);
1480         cifs_kmap_unlock();
1481
1482         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1483
1484         req->Length = cpu_to_le32(wdata->bytes);
1485
1486         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1487
1488         kref_get(&wdata->refcount);
1489         rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1,
1490                              NULL, smb2_writev_callback, wdata, 0);
1491
1492         if (rc)
1493                 kref_put(&wdata->refcount, cifs_writedata_release);
1494
1495         /* send is done, unmap pages */
1496         for (i = 0; i < wdata->nr_pages; i++)
1497                 kunmap(wdata->pages[i]);
1498
1499 async_writev_out:
1500         cifs_small_buf_release(req);
1501         kfree(iov);
1502         return rc;
1503 }
1504
1505 /*
1506  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1507  * The length field from io_parms must be at least 1 and indicates a number of
1508  * elements with data to write that begins with position 1 in iov array. All
1509  * data length is specified by count.
1510  */
1511 int
1512 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1513            unsigned int *nbytes, struct kvec *iov, int n_vec)
1514 {
1515         int rc = 0;
1516         struct smb2_write_req *req = NULL;
1517         struct smb2_write_rsp *rsp = NULL;
1518         int resp_buftype;
1519         *nbytes = 0;
1520
1521         if (n_vec < 1)
1522                 return rc;
1523
1524         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1525         if (rc)
1526                 return rc;
1527
1528         if (io_parms->tcon->ses->server == NULL)
1529                 return -ECONNABORTED;
1530
1531         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1532
1533         req->PersistentFileId = io_parms->persistent_fid;
1534         req->VolatileFileId = io_parms->volatile_fid;
1535         req->WriteChannelInfoOffset = 0;
1536         req->WriteChannelInfoLength = 0;
1537         req->Channel = 0;
1538         req->Length = cpu_to_le32(io_parms->length);
1539         req->Offset = cpu_to_le64(io_parms->offset);
1540         /* 4 for rfc1002 length field */
1541         req->DataOffset = cpu_to_le16(
1542                                 offsetof(struct smb2_write_req, Buffer) - 4);
1543         req->RemainingBytes = 0;
1544
1545         iov[0].iov_base = (char *)req;
1546         /* 4 for rfc1002 length field and 1 for Buffer */
1547         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1548
1549         /* length of entire message including data to be written */
1550         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1551
1552         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1553                           &resp_buftype, 0);
1554
1555         if (rc) {
1556                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1557                 cERROR(1, "Send error in write = %d", rc);
1558         } else {
1559                 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1560                 *nbytes = le32_to_cpu(rsp->DataLength);
1561                 free_rsp_buf(resp_buftype, rsp);
1562         }
1563         return rc;
1564 }