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TOMOYO Linux Cross Reference
Linux/fs/cifs/smb2pdu.c

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
  5  *                 Etersoft, 2012
  6  *   Author(s): Steve French (sfrench@us.ibm.com)
  7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
  8  *
  9  *   Contains the routines for constructing the SMB2 PDUs themselves
 10  *
 11  *   This library is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU Lesser General Public License as published
 13  *   by the Free Software Foundation; either version 2.1 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This library is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 19  *   the GNU Lesser General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU Lesser General Public License
 22  *   along with this library; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  */
 25 
 26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 27  /* Note that there are handle based routines which must be                   */
 28  /* treated slightly differently for reconnection purposes since we never     */
 29  /* want to reuse a stale file handle and only the caller knows the file info */
 30 
 31 #include <linux/fs.h>
 32 #include <linux/kernel.h>
 33 #include <linux/vfs.h>
 34 #include <linux/task_io_accounting_ops.h>
 35 #include <linux/uaccess.h>
 36 #include <linux/pagemap.h>
 37 #include <linux/xattr.h>
 38 #include "smb2pdu.h"
 39 #include "cifsglob.h"
 40 #include "cifsacl.h"
 41 #include "cifsproto.h"
 42 #include "smb2proto.h"
 43 #include "cifs_unicode.h"
 44 #include "cifs_debug.h"
 45 #include "ntlmssp.h"
 46 #include "smb2status.h"
 47 #include "smb2glob.h"
 48 #include "cifspdu.h"
 49 
 50 /*
 51  *  The following table defines the expected "StructureSize" of SMB2 requests
 52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 53  *
 54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 55  *  indexed by command in host byte order.
 56  */
 57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
 58         /* SMB2_NEGOTIATE */ 36,
 59         /* SMB2_SESSION_SETUP */ 25,
 60         /* SMB2_LOGOFF */ 4,
 61         /* SMB2_TREE_CONNECT */ 9,
 62         /* SMB2_TREE_DISCONNECT */ 4,
 63         /* SMB2_CREATE */ 57,
 64         /* SMB2_CLOSE */ 24,
 65         /* SMB2_FLUSH */ 24,
 66         /* SMB2_READ */ 49,
 67         /* SMB2_WRITE */ 49,
 68         /* SMB2_LOCK */ 48,
 69         /* SMB2_IOCTL */ 57,
 70         /* SMB2_CANCEL */ 4,
 71         /* SMB2_ECHO */ 4,
 72         /* SMB2_QUERY_DIRECTORY */ 33,
 73         /* SMB2_CHANGE_NOTIFY */ 32,
 74         /* SMB2_QUERY_INFO */ 41,
 75         /* SMB2_SET_INFO */ 33,
 76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
 77 };
 78 
 79 
 80 static void
 81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
 82                   const struct cifs_tcon *tcon)
 83 {
 84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
 85         char *temp = (char *)hdr;
 86         /* lookup word count ie StructureSize from table */
 87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
 88 
 89         /*
 90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 91          * largest operations (Create)
 92          */
 93         memset(temp, 0, 256);
 94 
 95         /* Note this is only network field converted to big endian */
 96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
 97                         - 4 /*  RFC 1001 length field itself not counted */);
 98 
 99         hdr->ProtocolId[0] = 0xFE;
100         hdr->ProtocolId[1] = 'S';
101         hdr->ProtocolId[2] = 'M';
102         hdr->ProtocolId[3] = 'B';
103         hdr->StructureSize = cpu_to_le16(64);
104         hdr->Command = smb2_cmd;
105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
107 
108         if (!tcon)
109                 goto out;
110 
111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
114         if ((tcon->ses) &&
115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
116                 hdr->CreditCharge = cpu_to_le16(1);
117         /* else CreditCharge MBZ */
118 
119         hdr->TreeId = tcon->tid;
120         /* Uid is not converted */
121         if (tcon->ses)
122                 hdr->SessionId = tcon->ses->Suid;
123 
124         /*
125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
126          * to pass the path on the Open SMB prefixed by \\server\share.
127          * Not sure when we would need to do the augmented path (if ever) and
128          * setting this flag breaks the SMB2 open operation since it is
129          * illegal to send an empty path name (without \\server\share prefix)
130          * when the DFS flag is set in the SMB open header. We could
131          * consider setting the flag on all operations other than open
132          * but it is safer to net set it for now.
133          */
134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
136 
137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
139 out:
140         pdu->StructureSize2 = cpu_to_le16(parmsize);
141         return;
142 }
143 
144 static int
145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
146 {
147         int rc = 0;
148         struct nls_table *nls_codepage;
149         struct cifs_ses *ses;
150         struct TCP_Server_Info *server;
151 
152         /*
153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
154          * check for tcp and smb session status done differently
155          * for those three - in the calling routine.
156          */
157         if (tcon == NULL)
158                 return rc;
159 
160         if (smb2_command == SMB2_TREE_CONNECT)
161                 return rc;
162 
163         if (tcon->tidStatus == CifsExiting) {
164                 /*
165                  * only tree disconnect, open, and write,
166                  * (and ulogoff which does not have tcon)
167                  * are allowed as we start force umount.
168                  */
169                 if ((smb2_command != SMB2_WRITE) &&
170                    (smb2_command != SMB2_CREATE) &&
171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
173                                  smb2_command);
174                         return -ENODEV;
175                 }
176         }
177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
178             (!tcon->ses->server))
179                 return -EIO;
180 
181         ses = tcon->ses;
182         server = ses->server;
183 
184         /*
185          * Give demultiplex thread up to 10 seconds to reconnect, should be
186          * greater than cifs socket timeout which is 7 seconds
187          */
188         while (server->tcpStatus == CifsNeedReconnect) {
189                 /*
190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
191                  * here since they are implicitly done when session drops.
192                  */
193                 switch (smb2_command) {
194                 /*
195                  * BB Should we keep oplock break and add flush to exceptions?
196                  */
197                 case SMB2_TREE_DISCONNECT:
198                 case SMB2_CANCEL:
199                 case SMB2_CLOSE:
200                 case SMB2_OPLOCK_BREAK:
201                         return -EAGAIN;
202                 }
203 
204                 wait_event_interruptible_timeout(server->response_q,
205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
206 
207                 /* are we still trying to reconnect? */
208                 if (server->tcpStatus != CifsNeedReconnect)
209                         break;
210 
211                 /*
212                  * on "soft" mounts we wait once. Hard mounts keep
213                  * retrying until process is killed or server comes
214                  * back on-line
215                  */
216                 if (!tcon->retry) {
217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
218                         return -EHOSTDOWN;
219                 }
220         }
221 
222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
223                 return rc;
224 
225         nls_codepage = load_nls_default();
226 
227         /*
228          * need to prevent multiple threads trying to simultaneously reconnect
229          * the same SMB session
230          */
231         mutex_lock(&tcon->ses->session_mutex);
232         rc = cifs_negotiate_protocol(0, tcon->ses);
233         if (!rc && tcon->ses->need_reconnect)
234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
235 
236         if (rc || !tcon->need_reconnect) {
237                 mutex_unlock(&tcon->ses->session_mutex);
238                 goto out;
239         }
240 
241         cifs_mark_open_files_invalid(tcon);
242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
243         mutex_unlock(&tcon->ses->session_mutex);
244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
245         if (rc)
246                 goto out;
247         atomic_inc(&tconInfoReconnectCount);
248         /*
249          * BB FIXME add code to check if wsize needs update due to negotiated
250          * smb buffer size shrinking.
251          */
252 out:
253         /*
254          * Check if handle based operation so we know whether we can continue
255          * or not without returning to caller to reset file handle.
256          */
257         /*
258          * BB Is flush done by server on drop of tcp session? Should we special
259          * case it and skip above?
260          */
261         switch (smb2_command) {
262         case SMB2_FLUSH:
263         case SMB2_READ:
264         case SMB2_WRITE:
265         case SMB2_LOCK:
266         case SMB2_IOCTL:
267         case SMB2_QUERY_DIRECTORY:
268         case SMB2_CHANGE_NOTIFY:
269         case SMB2_QUERY_INFO:
270         case SMB2_SET_INFO:
271                 return -EAGAIN;
272         }
273         unload_nls(nls_codepage);
274         return rc;
275 }
276 
277 /*
278  * Allocate and return pointer to an SMB request hdr, and set basic
279  * SMB information in the SMB header. If the return code is zero, this
280  * function must have filled in request_buf pointer.
281  */
282 static int
283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
284                 void **request_buf)
285 {
286         int rc = 0;
287 
288         rc = smb2_reconnect(smb2_command, tcon);
289         if (rc)
290                 return rc;
291 
292         /* BB eventually switch this to SMB2 specific small buf size */
293         *request_buf = cifs_small_buf_get();
294         if (*request_buf == NULL) {
295                 /* BB should we add a retry in here if not a writepage? */
296                 return -ENOMEM;
297         }
298 
299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
300 
301         if (tcon != NULL) {
302 #ifdef CONFIG_CIFS_STATS2
303                 uint16_t com_code = le16_to_cpu(smb2_command);
304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
305 #endif
306                 cifs_stats_inc(&tcon->num_smbs_sent);
307         }
308 
309         return rc;
310 }
311 
312 static void
313 free_rsp_buf(int resp_buftype, void *rsp)
314 {
315         if (resp_buftype == CIFS_SMALL_BUFFER)
316                 cifs_small_buf_release(rsp);
317         else if (resp_buftype == CIFS_LARGE_BUFFER)
318                 cifs_buf_release(rsp);
319 }
320 
321 
322 /*
323  *
324  *      SMB2 Worker functions follow:
325  *
326  *      The general structure of the worker functions is:
327  *      1) Call smb2_init (assembles SMB2 header)
328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
330  *      4) Decode SMB2 command specific fields in the fixed length area
331  *      5) Decode variable length data area (if any for this SMB2 command type)
332  *      6) Call free smb buffer
333  *      7) return
334  *
335  */
336 
337 int
338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
339 {
340         struct smb2_negotiate_req *req;
341         struct smb2_negotiate_rsp *rsp;
342         struct kvec iov[1];
343         int rc = 0;
344         int resp_buftype;
345         struct TCP_Server_Info *server = ses->server;
346         int blob_offset, blob_length;
347         char *security_blob;
348         int flags = CIFS_NEG_OP;
349 
350         cifs_dbg(FYI, "Negotiate protocol\n");
351 
352         if (!server) {
353                 WARN(1, "%s: server is NULL!\n", __func__);
354                 return -EIO;
355         }
356 
357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
358         if (rc)
359                 return rc;
360 
361         req->hdr.SessionId = 0;
362 
363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
364 
365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
366         inc_rfc1001_len(req, 2);
367 
368         /* only one of SMB2 signing flags may be set in SMB2 request */
369         if (ses->sign)
370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
371         else if (global_secflags & CIFSSEC_MAY_SIGN)
372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
373         else
374                 req->SecurityMode = 0;
375 
376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
377 
378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
379 
380         iov[0].iov_base = (char *)req;
381         /* 4 for rfc1002 length field */
382         iov[0].iov_len = get_rfc1002_length(req) + 4;
383 
384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
385 
386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
387         /*
388          * No tcon so can't do
389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
390          */
391         if (rc != 0)
392                 goto neg_exit;
393 
394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
395 
396         /* BB we may eventually want to match the negotiated vs. requested
397            dialect, even though we are only requesting one at a time */
398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
406         else {
407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
408                          le16_to_cpu(rsp->DialectRevision));
409                 rc = -EIO;
410                 goto neg_exit;
411         }
412         server->dialect = le16_to_cpu(rsp->DialectRevision);
413 
414         /* SMB2 only has an extended negflavor */
415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
419         /* BB Do we need to validate the SecurityMode? */
420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
421         server->capabilities = le32_to_cpu(rsp->Capabilities);
422         /* Internal types */
423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
424 
425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
426                                                &rsp->hdr);
427         /*
428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
429          * for us will be
430          *      ses->sectype = RawNTLMSSP;
431          * but for time being this is our only auth choice so doesn't matter.
432          * We just found a server which sets blob length to zero expecting raw.
433          */
434         if (blob_length == 0)
435                 cifs_dbg(FYI, "missing security blob on negprot\n");
436 
437         rc = cifs_enable_signing(server, ses->sign);
438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
439         if (rc)
440                 goto neg_exit;
441         if (blob_length)
442                 rc = decode_neg_token_init(security_blob, blob_length,
443                                    &server->sec_type);
444         if (rc == 1)
445                 rc = 0;
446         else if (rc == 0) {
447                 rc = -EIO;
448                 goto neg_exit;
449         }
450 #endif
451 
452 neg_exit:
453         free_rsp_buf(resp_buftype, rsp);
454         return rc;
455 }
456 
457 int
458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
459                 const struct nls_table *nls_cp)
460 {
461         struct smb2_sess_setup_req *req;
462         struct smb2_sess_setup_rsp *rsp = NULL;
463         struct kvec iov[2];
464         int rc = 0;
465         int resp_buftype;
466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
467         struct TCP_Server_Info *server = ses->server;
468         u16 blob_length = 0;
469         char *security_blob;
470         char *ntlmssp_blob = NULL;
471         bool use_spnego = false; /* else use raw ntlmssp */
472 
473         cifs_dbg(FYI, "Session Setup\n");
474 
475         if (!server) {
476                 WARN(1, "%s: server is NULL!\n", __func__);
477                 return -EIO;
478         }
479 
480         /*
481          * If memory allocation is successful, caller of this function
482          * frees it.
483          */
484         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
485         if (!ses->ntlmssp)
486                 return -ENOMEM;
487 
488         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
489         ses->sectype = RawNTLMSSP;
490 
491 ssetup_ntlmssp_authenticate:
492         if (phase == NtLmChallenge)
493                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
494 
495         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
496         if (rc)
497                 return rc;
498 
499         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
500         req->VcNumber = 0; /* MBZ */
501         /* to enable echos and oplocks */
502         req->hdr.CreditRequest = cpu_to_le16(3);
503 
504         /* only one of SMB2 signing flags may be set in SMB2 request */
505         if (server->sign)
506                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
507         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
508                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
509         else
510                 req->SecurityMode = 0;
511 
512         req->Capabilities = 0;
513         req->Channel = 0; /* MBZ */
514 
515         iov[0].iov_base = (char *)req;
516         /* 4 for rfc1002 length field and 1 for pad */
517         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
518         if (phase == NtLmNegotiate) {
519                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
520                                        GFP_KERNEL);
521                 if (ntlmssp_blob == NULL) {
522                         rc = -ENOMEM;
523                         goto ssetup_exit;
524                 }
525                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
526                 if (use_spnego) {
527                         /* blob_length = build_spnego_ntlmssp_blob(
528                                         &security_blob,
529                                         sizeof(struct _NEGOTIATE_MESSAGE),
530                                         ntlmssp_blob); */
531                         /* BB eventually need to add this */
532                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
533                         rc = -EOPNOTSUPP;
534                         kfree(ntlmssp_blob);
535                         goto ssetup_exit;
536                 } else {
537                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
538                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
539                         security_blob = ntlmssp_blob;
540                 }
541         } else if (phase == NtLmAuthenticate) {
542                 req->hdr.SessionId = ses->Suid;
543                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
544                                        GFP_KERNEL);
545                 if (ntlmssp_blob == NULL) {
546                         rc = -ENOMEM;
547                         goto ssetup_exit;
548                 }
549                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
550                                              nls_cp);
551                 if (rc) {
552                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
553                                  rc);
554                         goto ssetup_exit; /* BB double check error handling */
555                 }
556                 if (use_spnego) {
557                         /* blob_length = build_spnego_ntlmssp_blob(
558                                                         &security_blob,
559                                                         blob_length,
560                                                         ntlmssp_blob); */
561                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
562                         rc = -EOPNOTSUPP;
563                         kfree(ntlmssp_blob);
564                         goto ssetup_exit;
565                 } else {
566                         security_blob = ntlmssp_blob;
567                 }
568         } else {
569                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
570                 rc = -EIO;
571                 goto ssetup_exit;
572         }
573 
574         /* Testing shows that buffer offset must be at location of Buffer[0] */
575         req->SecurityBufferOffset =
576                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
577                                             1 /* pad */ - 4 /* rfc1001 len */);
578         req->SecurityBufferLength = cpu_to_le16(blob_length);
579         iov[1].iov_base = security_blob;
580         iov[1].iov_len = blob_length;
581 
582         inc_rfc1001_len(req, blob_length - 1 /* pad */);
583 
584         /* BB add code to build os and lm fields */
585 
586         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
587                           CIFS_LOG_ERROR | CIFS_NEG_OP);
588 
589         kfree(security_blob);
590         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
591         if (resp_buftype != CIFS_NO_BUFFER &&
592             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
593                 if (phase != NtLmNegotiate) {
594                         cifs_dbg(VFS, "Unexpected more processing error\n");
595                         goto ssetup_exit;
596                 }
597                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
598                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
599                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
600                                  le16_to_cpu(rsp->SecurityBufferOffset));
601                         rc = -EIO;
602                         goto ssetup_exit;
603                 }
604 
605                 /* NTLMSSP Negotiate sent now processing challenge (response) */
606                 phase = NtLmChallenge; /* process ntlmssp challenge */
607                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
608                 ses->Suid = rsp->hdr.SessionId;
609                 rc = decode_ntlmssp_challenge(rsp->Buffer,
610                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
611         }
612 
613         /*
614          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
615          * but at least the raw NTLMSSP case works.
616          */
617         /*
618          * No tcon so can't do
619          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
620          */
621         if (rc != 0)
622                 goto ssetup_exit;
623 
624         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
625 ssetup_exit:
626         free_rsp_buf(resp_buftype, rsp);
627 
628         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
629         if ((phase == NtLmChallenge) && (rc == 0))
630                 goto ssetup_ntlmssp_authenticate;
631         return rc;
632 }
633 
634 int
635 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
636 {
637         struct smb2_logoff_req *req; /* response is also trivial struct */
638         int rc = 0;
639         struct TCP_Server_Info *server;
640 
641         cifs_dbg(FYI, "disconnect session %p\n", ses);
642 
643         if (ses && (ses->server))
644                 server = ses->server;
645         else
646                 return -EIO;
647 
648         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
649         if (rc)
650                 return rc;
651 
652          /* since no tcon, smb2_init can not do this, so do here */
653         req->hdr.SessionId = ses->Suid;
654         if (server->sign)
655                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
656 
657         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
658         /*
659          * No tcon so can't do
660          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
661          */
662         return rc;
663 }
664 
665 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
666 {
667         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
668 }
669 
670 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
671 
672 int
673 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
674           struct cifs_tcon *tcon, const struct nls_table *cp)
675 {
676         struct smb2_tree_connect_req *req;
677         struct smb2_tree_connect_rsp *rsp = NULL;
678         struct kvec iov[2];
679         int rc = 0;
680         int resp_buftype;
681         int unc_path_len;
682         struct TCP_Server_Info *server;
683         __le16 *unc_path = NULL;
684 
685         cifs_dbg(FYI, "TCON\n");
686 
687         if ((ses->server) && tree)
688                 server = ses->server;
689         else
690                 return -EIO;
691 
692         if (tcon && tcon->bad_network_name)
693                 return -ENOENT;
694 
695         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
696         if (unc_path == NULL)
697                 return -ENOMEM;
698 
699         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
700         unc_path_len *= 2;
701         if (unc_path_len < 2) {
702                 kfree(unc_path);
703                 return -EINVAL;
704         }
705 
706         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
707         if (rc) {
708                 kfree(unc_path);
709                 return rc;
710         }
711 
712         if (tcon == NULL) {
713                 /* since no tcon, smb2_init can not do this, so do here */
714                 req->hdr.SessionId = ses->Suid;
715                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
716                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
717         }
718 
719         iov[0].iov_base = (char *)req;
720         /* 4 for rfc1002 length field and 1 for pad */
721         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
722 
723         /* Testing shows that buffer offset must be at location of Buffer[0] */
724         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
725                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
726         req->PathLength = cpu_to_le16(unc_path_len - 2);
727         iov[1].iov_base = unc_path;
728         iov[1].iov_len = unc_path_len;
729 
730         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
731 
732         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
733         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
734 
735         if (rc != 0) {
736                 if (tcon) {
737                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
738                         tcon->need_reconnect = true;
739                 }
740                 goto tcon_error_exit;
741         }
742 
743         if (tcon == NULL) {
744                 ses->ipc_tid = rsp->hdr.TreeId;
745                 goto tcon_exit;
746         }
747 
748         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
749                 cifs_dbg(FYI, "connection to disk share\n");
750         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
751                 tcon->ipc = true;
752                 cifs_dbg(FYI, "connection to pipe share\n");
753         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
754                 tcon->print = true;
755                 cifs_dbg(FYI, "connection to printer\n");
756         } else {
757                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
758                 rc = -EOPNOTSUPP;
759                 goto tcon_error_exit;
760         }
761 
762         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
763         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
764         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
765         tcon->tidStatus = CifsGood;
766         tcon->need_reconnect = false;
767         tcon->tid = rsp->hdr.TreeId;
768         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
769 
770         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
771             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
772                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
773 
774 tcon_exit:
775         free_rsp_buf(resp_buftype, rsp);
776         kfree(unc_path);
777         return rc;
778 
779 tcon_error_exit:
780         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
781                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
782                 tcon->bad_network_name = true;
783         }
784         goto tcon_exit;
785 }
786 
787 int
788 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
789 {
790         struct smb2_tree_disconnect_req *req; /* response is trivial */
791         int rc = 0;
792         struct TCP_Server_Info *server;
793         struct cifs_ses *ses = tcon->ses;
794 
795         cifs_dbg(FYI, "Tree Disconnect\n");
796 
797         if (ses && (ses->server))
798                 server = ses->server;
799         else
800                 return -EIO;
801 
802         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
803                 return 0;
804 
805         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
806         if (rc)
807                 return rc;
808 
809         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
810         if (rc)
811                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
812 
813         return rc;
814 }
815 
816 static struct create_lease *
817 create_lease_buf(u8 *lease_key, u8 oplock)
818 {
819         struct create_lease *buf;
820 
821         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
822         if (!buf)
823                 return NULL;
824 
825         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
826         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
827         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
828                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
829                                            SMB2_LEASE_READ_CACHING;
830         else if (oplock == SMB2_OPLOCK_LEVEL_II)
831                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
832         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
833                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
834                                            SMB2_LEASE_READ_CACHING |
835                                            SMB2_LEASE_WRITE_CACHING;
836 
837         buf->ccontext.DataOffset = cpu_to_le16(offsetof
838                                         (struct create_lease, lcontext));
839         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
840         buf->ccontext.NameOffset = cpu_to_le16(offsetof
841                                 (struct create_lease, Name));
842         buf->ccontext.NameLength = cpu_to_le16(4);
843         buf->Name[0] = 'R';
844         buf->Name[1] = 'q';
845         buf->Name[2] = 'L';
846         buf->Name[3] = 's';
847         return buf;
848 }
849 
850 static struct create_durable *
851 create_durable_buf(void)
852 {
853         struct create_durable *buf;
854 
855         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
856         if (!buf)
857                 return NULL;
858 
859         buf->ccontext.DataOffset = cpu_to_le16(offsetof
860                                         (struct create_durable, Data));
861         buf->ccontext.DataLength = cpu_to_le32(16);
862         buf->ccontext.NameOffset = cpu_to_le16(offsetof
863                                 (struct create_durable, Name));
864         buf->ccontext.NameLength = cpu_to_le16(4);
865         buf->Name[0] = 'D';
866         buf->Name[1] = 'H';
867         buf->Name[2] = 'n';
868         buf->Name[3] = 'Q';
869         return buf;
870 }
871 
872 static struct create_durable *
873 create_reconnect_durable_buf(struct cifs_fid *fid)
874 {
875         struct create_durable *buf;
876 
877         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
878         if (!buf)
879                 return NULL;
880 
881         buf->ccontext.DataOffset = cpu_to_le16(offsetof
882                                         (struct create_durable, Data));
883         buf->ccontext.DataLength = cpu_to_le32(16);
884         buf->ccontext.NameOffset = cpu_to_le16(offsetof
885                                 (struct create_durable, Name));
886         buf->ccontext.NameLength = cpu_to_le16(4);
887         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
888         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
889         buf->Name[0] = 'D';
890         buf->Name[1] = 'H';
891         buf->Name[2] = 'n';
892         buf->Name[3] = 'C';
893         return buf;
894 }
895 
896 static __u8
897 parse_lease_state(struct smb2_create_rsp *rsp)
898 {
899         char *data_offset;
900         struct create_lease *lc;
901         bool found = false;
902         unsigned int next = 0;
903         char *name;
904 
905         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
906         lc = (struct create_lease *)data_offset;
907         do {
908                 lc = (struct create_lease *)((char *)lc + next);
909                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
910                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
911                     strncmp(name, "RqLs", 4)) {
912                         next = le32_to_cpu(lc->ccontext.Next);
913                         continue;
914                 }
915                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
916                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
917                 found = true;
918                 break;
919         } while (next != 0);
920 
921         if (!found)
922                 return 0;
923 
924         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
925 }
926 
927 static int
928 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
929 {
930         struct smb2_create_req *req = iov[0].iov_base;
931         unsigned int num = *num_iovec;
932 
933         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
934         if (iov[num].iov_base == NULL)
935                 return -ENOMEM;
936         iov[num].iov_len = sizeof(struct create_lease);
937         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
938         if (!req->CreateContextsOffset)
939                 req->CreateContextsOffset = cpu_to_le32(
940                                 sizeof(struct smb2_create_req) - 4 +
941                                 iov[num - 1].iov_len);
942         req->CreateContextsLength = cpu_to_le32(
943                                 le32_to_cpu(req->CreateContextsLength) +
944                                 sizeof(struct create_lease));
945         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
946         *num_iovec = num + 1;
947         return 0;
948 }
949 
950 static int
951 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
952                     struct cifs_open_parms *oparms)
953 {
954         struct smb2_create_req *req = iov[0].iov_base;
955         unsigned int num = *num_iovec;
956 
957         if (oparms->reconnect) {
958                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
959                 /* indicate that we don't need to relock the file */
960                 oparms->reconnect = false;
961         } else
962                 iov[num].iov_base = create_durable_buf();
963         if (iov[num].iov_base == NULL)
964                 return -ENOMEM;
965         iov[num].iov_len = sizeof(struct create_durable);
966         if (!req->CreateContextsOffset)
967                 req->CreateContextsOffset =
968                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
969                                                                 iov[1].iov_len);
970         req->CreateContextsLength =
971                         cpu_to_le32(le32_to_cpu(req->CreateContextsLength) +
972                                                 sizeof(struct create_durable));
973         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
974         *num_iovec = num + 1;
975         return 0;
976 }
977 
978 int
979 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
980           __u8 *oplock, struct smb2_file_all_info *buf)
981 {
982         struct smb2_create_req *req;
983         struct smb2_create_rsp *rsp;
984         struct TCP_Server_Info *server;
985         struct cifs_tcon *tcon = oparms->tcon;
986         struct cifs_ses *ses = tcon->ses;
987         struct kvec iov[4];
988         int resp_buftype;
989         int uni_path_len;
990         __le16 *copy_path = NULL;
991         int copy_size;
992         int rc = 0;
993         unsigned int num_iovecs = 2;
994         __u32 file_attributes = 0;
995 
996         cifs_dbg(FYI, "create/open\n");
997 
998         if (ses && (ses->server))
999                 server = ses->server;
1000         else
1001                 return -EIO;
1002 
1003         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1004         if (rc)
1005                 return rc;
1006 
1007         if (oparms->create_options & CREATE_OPTION_READONLY)
1008                 file_attributes |= ATTR_READONLY;
1009 
1010         req->ImpersonationLevel = IL_IMPERSONATION;
1011         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1012         /* File attributes ignored on open (used in create though) */
1013         req->FileAttributes = cpu_to_le32(file_attributes);
1014         req->ShareAccess = FILE_SHARE_ALL_LE;
1015         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1016         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1017         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1018         /* do not count rfc1001 len field */
1019         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1020 
1021         iov[0].iov_base = (char *)req;
1022         /* 4 for rfc1002 length field */
1023         iov[0].iov_len = get_rfc1002_length(req) + 4;
1024 
1025         /* MUST set path len (NameLength) to 0 opening root of share */
1026         req->NameLength = cpu_to_le16(uni_path_len - 2);
1027         /* -1 since last byte is buf[0] which is sent below (path) */
1028         iov[0].iov_len--;
1029         if (uni_path_len % 8 != 0) {
1030                 copy_size = uni_path_len / 8 * 8;
1031                 if (copy_size < uni_path_len)
1032                         copy_size += 8;
1033 
1034                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1035                 if (!copy_path)
1036                         return -ENOMEM;
1037                 memcpy((char *)copy_path, (const char *)path,
1038                         uni_path_len);
1039                 uni_path_len = copy_size;
1040                 path = copy_path;
1041         }
1042 
1043         iov[1].iov_len = uni_path_len;
1044         iov[1].iov_base = path;
1045         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1046         inc_rfc1001_len(req, uni_path_len - 1);
1047 
1048         if (!server->oplocks)
1049                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1050 
1051         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1052             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1053                 req->RequestedOplockLevel = *oplock;
1054         else {
1055                 rc = add_lease_context(iov, &num_iovecs, oplock);
1056                 if (rc) {
1057                         cifs_small_buf_release(req);
1058                         kfree(copy_path);
1059                         return rc;
1060                 }
1061         }
1062 
1063         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1064                 /* need to set Next field of lease context if we request it */
1065                 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1066                         struct create_context *ccontext =
1067                             (struct create_context *)iov[num_iovecs-1].iov_base;
1068                         ccontext->Next =
1069                                 cpu_to_le32(sizeof(struct create_lease));
1070                 }
1071                 rc = add_durable_context(iov, &num_iovecs, oparms);
1072                 if (rc) {
1073                         cifs_small_buf_release(req);
1074                         kfree(copy_path);
1075                         kfree(iov[num_iovecs-1].iov_base);
1076                         return rc;
1077                 }
1078         }
1079 
1080         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1081         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1082 
1083         if (rc != 0) {
1084                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1085                 goto creat_exit;
1086         }
1087 
1088         oparms->fid->persistent_fid = rsp->PersistentFileId;
1089         oparms->fid->volatile_fid = rsp->VolatileFileId;
1090 
1091         if (buf) {
1092                 memcpy(buf, &rsp->CreationTime, 32);
1093                 buf->AllocationSize = rsp->AllocationSize;
1094                 buf->EndOfFile = rsp->EndofFile;
1095                 buf->Attributes = rsp->FileAttributes;
1096                 buf->NumberOfLinks = cpu_to_le32(1);
1097                 buf->DeletePending = 0;
1098         }
1099 
1100         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1101                 *oplock = parse_lease_state(rsp);
1102         else
1103                 *oplock = rsp->OplockLevel;
1104 creat_exit:
1105         kfree(copy_path);
1106         free_rsp_buf(resp_buftype, rsp);
1107         return rc;
1108 }
1109 
1110 /*
1111  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1112  */
1113 int
1114 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1115            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1116            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1117 {
1118         struct smb2_ioctl_req *req;
1119         struct smb2_ioctl_rsp *rsp;
1120         struct TCP_Server_Info *server;
1121         struct cifs_ses *ses = tcon->ses;
1122         struct kvec iov[2];
1123         int resp_buftype;
1124         int num_iovecs;
1125         int rc = 0;
1126 
1127         cifs_dbg(FYI, "SMB2 IOCTL\n");
1128 
1129         /* zero out returned data len, in case of error */
1130         if (plen)
1131                 *plen = 0;
1132 
1133         if (ses && (ses->server))
1134                 server = ses->server;
1135         else
1136                 return -EIO;
1137 
1138         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1139         if (rc)
1140                 return rc;
1141 
1142         req->CtlCode = cpu_to_le32(opcode);
1143         req->PersistentFileId = persistent_fid;
1144         req->VolatileFileId = volatile_fid;
1145 
1146         if (indatalen) {
1147                 req->InputCount = cpu_to_le32(indatalen);
1148                 /* do not set InputOffset if no input data */
1149                 req->InputOffset =
1150                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1151                 iov[1].iov_base = in_data;
1152                 iov[1].iov_len = indatalen;
1153                 num_iovecs = 2;
1154         } else
1155                 num_iovecs = 1;
1156 
1157         req->OutputOffset = 0;
1158         req->OutputCount = 0; /* MBZ */
1159 
1160         /*
1161          * Could increase MaxOutputResponse, but that would require more
1162          * than one credit. Windows typically sets this smaller, but for some
1163          * ioctls it may be useful to allow server to send more. No point
1164          * limiting what the server can send as long as fits in one credit
1165          */
1166         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1167 
1168         if (is_fsctl)
1169                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1170         else
1171                 req->Flags = 0;
1172 
1173         iov[0].iov_base = (char *)req;
1174         /* 4 for rfc1002 length field */
1175         iov[0].iov_len = get_rfc1002_length(req) + 4;
1176 
1177         if (indatalen)
1178                 inc_rfc1001_len(req, indatalen);
1179 
1180         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1181         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1182 
1183         if (rc != 0) {
1184                 if (tcon)
1185                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1186                 goto ioctl_exit;
1187         }
1188 
1189         /* check if caller wants to look at return data or just return rc */
1190         if ((plen == NULL) || (out_data == NULL))
1191                 goto ioctl_exit;
1192 
1193         *plen = le32_to_cpu(rsp->OutputCount);
1194 
1195         /* We check for obvious errors in the output buffer length and offset */
1196         if (*plen == 0)
1197                 goto ioctl_exit; /* server returned no data */
1198         else if (*plen > 0xFF00) {
1199                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1200                 *plen = 0;
1201                 rc = -EIO;
1202                 goto ioctl_exit;
1203         }
1204 
1205         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1206                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1207                         le32_to_cpu(rsp->OutputOffset));
1208                 *plen = 0;
1209                 rc = -EIO;
1210                 goto ioctl_exit;
1211         }
1212 
1213         *out_data = kmalloc(*plen, GFP_KERNEL);
1214         if (*out_data == NULL) {
1215                 rc = -ENOMEM;
1216                 goto ioctl_exit;
1217         }
1218 
1219         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1220                *plen);
1221 ioctl_exit:
1222         free_rsp_buf(resp_buftype, rsp);
1223         return rc;
1224 }
1225 
1226 int
1227 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1228            u64 persistent_fid, u64 volatile_fid)
1229 {
1230         struct smb2_close_req *req;
1231         struct smb2_close_rsp *rsp;
1232         struct TCP_Server_Info *server;
1233         struct cifs_ses *ses = tcon->ses;
1234         struct kvec iov[1];
1235         int resp_buftype;
1236         int rc = 0;
1237 
1238         cifs_dbg(FYI, "Close\n");
1239 
1240         if (ses && (ses->server))
1241                 server = ses->server;
1242         else
1243                 return -EIO;
1244 
1245         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1246         if (rc)
1247                 return rc;
1248 
1249         req->PersistentFileId = persistent_fid;
1250         req->VolatileFileId = volatile_fid;
1251 
1252         iov[0].iov_base = (char *)req;
1253         /* 4 for rfc1002 length field */
1254         iov[0].iov_len = get_rfc1002_length(req) + 4;
1255 
1256         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1257         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1258 
1259         if (rc != 0) {
1260                 if (tcon)
1261                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1262                 goto close_exit;
1263         }
1264 
1265         /* BB FIXME - decode close response, update inode for caching */
1266 
1267 close_exit:
1268         free_rsp_buf(resp_buftype, rsp);
1269         return rc;
1270 }
1271 
1272 static int
1273 validate_buf(unsigned int offset, unsigned int buffer_length,
1274              struct smb2_hdr *hdr, unsigned int min_buf_size)
1275 
1276 {
1277         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1278         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1279         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1280         char *end_of_buf = begin_of_buf + buffer_length;
1281 
1282 
1283         if (buffer_length < min_buf_size) {
1284                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1285                          buffer_length, min_buf_size);
1286                 return -EINVAL;
1287         }
1288 
1289         /* check if beyond RFC1001 maximum length */
1290         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1291                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1292                          buffer_length, smb_len);
1293                 return -EINVAL;
1294         }
1295 
1296         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1297                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1298                 return -EINVAL;
1299         }
1300 
1301         return 0;
1302 }
1303 
1304 /*
1305  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1306  * Caller must free buffer.
1307  */
1308 static int
1309 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1310                       struct smb2_hdr *hdr, unsigned int minbufsize,
1311                       char *data)
1312 
1313 {
1314         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1315         int rc;
1316 
1317         if (!data)
1318                 return -EINVAL;
1319 
1320         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1321         if (rc)
1322                 return rc;
1323 
1324         memcpy(data, begin_of_buf, buffer_length);
1325 
1326         return 0;
1327 }
1328 
1329 static int
1330 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1331            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1332            size_t output_len, size_t min_len, void *data)
1333 {
1334         struct smb2_query_info_req *req;
1335         struct smb2_query_info_rsp *rsp = NULL;
1336         struct kvec iov[2];
1337         int rc = 0;
1338         int resp_buftype;
1339         struct TCP_Server_Info *server;
1340         struct cifs_ses *ses = tcon->ses;
1341 
1342         cifs_dbg(FYI, "Query Info\n");
1343 
1344         if (ses && (ses->server))
1345                 server = ses->server;
1346         else
1347                 return -EIO;
1348 
1349         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1350         if (rc)
1351                 return rc;
1352 
1353         req->InfoType = SMB2_O_INFO_FILE;
1354         req->FileInfoClass = info_class;
1355         req->PersistentFileId = persistent_fid;
1356         req->VolatileFileId = volatile_fid;
1357         /* 4 for rfc1002 length field and 1 for Buffer */
1358         req->InputBufferOffset =
1359                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1360         req->OutputBufferLength = cpu_to_le32(output_len);
1361 
1362         iov[0].iov_base = (char *)req;
1363         /* 4 for rfc1002 length field */
1364         iov[0].iov_len = get_rfc1002_length(req) + 4;
1365 
1366         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1367         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1368 
1369         if (rc) {
1370                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1371                 goto qinf_exit;
1372         }
1373 
1374         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1375                                    le32_to_cpu(rsp->OutputBufferLength),
1376                                    &rsp->hdr, min_len, data);
1377 
1378 qinf_exit:
1379         free_rsp_buf(resp_buftype, rsp);
1380         return rc;
1381 }
1382 
1383 int
1384 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1385                 u64 persistent_fid, u64 volatile_fid,
1386                 struct smb2_file_all_info *data)
1387 {
1388         return query_info(xid, tcon, persistent_fid, volatile_fid,
1389                           FILE_ALL_INFORMATION,
1390                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1391                           sizeof(struct smb2_file_all_info), data);
1392 }
1393 
1394 int
1395 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1396                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1397 {
1398         return query_info(xid, tcon, persistent_fid, volatile_fid,
1399                           FILE_INTERNAL_INFORMATION,
1400                           sizeof(struct smb2_file_internal_info),
1401                           sizeof(struct smb2_file_internal_info), uniqueid);
1402 }
1403 
1404 /*
1405  * This is a no-op for now. We're not really interested in the reply, but
1406  * rather in the fact that the server sent one and that server->lstrp
1407  * gets updated.
1408  *
1409  * FIXME: maybe we should consider checking that the reply matches request?
1410  */
1411 static void
1412 smb2_echo_callback(struct mid_q_entry *mid)
1413 {
1414         struct TCP_Server_Info *server = mid->callback_data;
1415         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1416         unsigned int credits_received = 1;
1417 
1418         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1419                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1420 
1421         DeleteMidQEntry(mid);
1422         add_credits(server, credits_received, CIFS_ECHO_OP);
1423 }
1424 
1425 int
1426 SMB2_echo(struct TCP_Server_Info *server)
1427 {
1428         struct smb2_echo_req *req;
1429         int rc = 0;
1430         struct kvec iov;
1431         struct smb_rqst rqst = { .rq_iov = &iov,
1432                                  .rq_nvec = 1 };
1433 
1434         cifs_dbg(FYI, "In echo request\n");
1435 
1436         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1437         if (rc)
1438                 return rc;
1439 
1440         req->hdr.CreditRequest = cpu_to_le16(1);
1441 
1442         iov.iov_base = (char *)req;
1443         /* 4 for rfc1002 length field */
1444         iov.iov_len = get_rfc1002_length(req) + 4;
1445 
1446         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1447                              CIFS_ECHO_OP);
1448         if (rc)
1449                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1450 
1451         cifs_small_buf_release(req);
1452         return rc;
1453 }
1454 
1455 int
1456 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1457            u64 volatile_fid)
1458 {
1459         struct smb2_flush_req *req;
1460         struct TCP_Server_Info *server;
1461         struct cifs_ses *ses = tcon->ses;
1462         struct kvec iov[1];
1463         int resp_buftype;
1464         int rc = 0;
1465 
1466         cifs_dbg(FYI, "Flush\n");
1467 
1468         if (ses && (ses->server))
1469                 server = ses->server;
1470         else
1471                 return -EIO;
1472 
1473         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1474         if (rc)
1475                 return rc;
1476 
1477         req->PersistentFileId = persistent_fid;
1478         req->VolatileFileId = volatile_fid;
1479 
1480         iov[0].iov_base = (char *)req;
1481         /* 4 for rfc1002 length field */
1482         iov[0].iov_len = get_rfc1002_length(req) + 4;
1483 
1484         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1485 
1486         if ((rc != 0) && tcon)
1487                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1488 
1489         free_rsp_buf(resp_buftype, iov[0].iov_base);
1490         return rc;
1491 }
1492 
1493 /*
1494  * To form a chain of read requests, any read requests after the first should
1495  * have the end_of_chain boolean set to true.
1496  */
1497 static int
1498 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1499                   unsigned int remaining_bytes, int request_type)
1500 {
1501         int rc = -EACCES;
1502         struct smb2_read_req *req = NULL;
1503 
1504         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1505         if (rc)
1506                 return rc;
1507         if (io_parms->tcon->ses->server == NULL)
1508                 return -ECONNABORTED;
1509 
1510         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1511 
1512         req->PersistentFileId = io_parms->persistent_fid;
1513         req->VolatileFileId = io_parms->volatile_fid;
1514         req->ReadChannelInfoOffset = 0; /* reserved */
1515         req->ReadChannelInfoLength = 0; /* reserved */
1516         req->Channel = 0; /* reserved */
1517         req->MinimumCount = 0;
1518         req->Length = cpu_to_le32(io_parms->length);
1519         req->Offset = cpu_to_le64(io_parms->offset);
1520 
1521         if (request_type & CHAINED_REQUEST) {
1522                 if (!(request_type & END_OF_CHAIN)) {
1523                         /* 4 for rfc1002 length field */
1524                         req->hdr.NextCommand =
1525                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1526                 } else /* END_OF_CHAIN */
1527                         req->hdr.NextCommand = 0;
1528                 if (request_type & RELATED_REQUEST) {
1529                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1530                         /*
1531                          * Related requests use info from previous read request
1532                          * in chain.
1533                          */
1534                         req->hdr.SessionId = 0xFFFFFFFF;
1535                         req->hdr.TreeId = 0xFFFFFFFF;
1536                         req->PersistentFileId = 0xFFFFFFFF;
1537                         req->VolatileFileId = 0xFFFFFFFF;
1538                 }
1539         }
1540         if (remaining_bytes > io_parms->length)
1541                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1542         else
1543                 req->RemainingBytes = 0;
1544 
1545         iov[0].iov_base = (char *)req;
1546         /* 4 for rfc1002 length field */
1547         iov[0].iov_len = get_rfc1002_length(req) + 4;
1548         return rc;
1549 }
1550 
1551 static void
1552 smb2_readv_callback(struct mid_q_entry *mid)
1553 {
1554         struct cifs_readdata *rdata = mid->callback_data;
1555         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1556         struct TCP_Server_Info *server = tcon->ses->server;
1557         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1558         unsigned int credits_received = 1;
1559         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1560                                  .rq_nvec = 1,
1561                                  .rq_pages = rdata->pages,
1562                                  .rq_npages = rdata->nr_pages,
1563                                  .rq_pagesz = rdata->pagesz,
1564                                  .rq_tailsz = rdata->tailsz };
1565 
1566         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1567                  __func__, mid->mid, mid->mid_state, rdata->result,
1568                  rdata->bytes);
1569 
1570         switch (mid->mid_state) {
1571         case MID_RESPONSE_RECEIVED:
1572                 credits_received = le16_to_cpu(buf->CreditRequest);
1573                 /* result already set, check signature */
1574                 if (server->sign) {
1575                         int rc;
1576 
1577                         rc = smb2_verify_signature(&rqst, server);
1578                         if (rc)
1579                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1580                                          rc);
1581                 }
1582                 /* FIXME: should this be counted toward the initiating task? */
1583                 task_io_account_read(rdata->bytes);
1584                 cifs_stats_bytes_read(tcon, rdata->bytes);
1585                 break;
1586         case MID_REQUEST_SUBMITTED:
1587         case MID_RETRY_NEEDED:
1588                 rdata->result = -EAGAIN;
1589                 break;
1590         default:
1591                 if (rdata->result != -ENODATA)
1592                         rdata->result = -EIO;
1593         }
1594 
1595         if (rdata->result)
1596                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1597 
1598         queue_work(cifsiod_wq, &rdata->work);
1599         DeleteMidQEntry(mid);
1600         add_credits(server, credits_received, 0);
1601 }
1602 
1603 /* smb2_async_readv - send an async write, and set up mid to handle result */
1604 int
1605 smb2_async_readv(struct cifs_readdata *rdata)
1606 {
1607         int rc;
1608         struct smb2_hdr *buf;
1609         struct cifs_io_parms io_parms;
1610         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1611                                  .rq_nvec = 1 };
1612 
1613         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1614                  __func__, rdata->offset, rdata->bytes);
1615 
1616         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1617         io_parms.offset = rdata->offset;
1618         io_parms.length = rdata->bytes;
1619         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1620         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1621         io_parms.pid = rdata->pid;
1622         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1623         if (rc)
1624                 return rc;
1625 
1626         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1627         /* 4 for rfc1002 length field */
1628         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1629 
1630         kref_get(&rdata->refcount);
1631         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1632                              cifs_readv_receive, smb2_readv_callback,
1633                              rdata, 0);
1634         if (rc) {
1635                 kref_put(&rdata->refcount, cifs_readdata_release);
1636                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1637         }
1638 
1639         cifs_small_buf_release(buf);
1640         return rc;
1641 }
1642 
1643 int
1644 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1645           unsigned int *nbytes, char **buf, int *buf_type)
1646 {
1647         int resp_buftype, rc = -EACCES;
1648         struct smb2_read_rsp *rsp = NULL;
1649         struct kvec iov[1];
1650 
1651         *nbytes = 0;
1652         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1653         if (rc)
1654                 return rc;
1655 
1656         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1657                           &resp_buftype, CIFS_LOG_ERROR);
1658 
1659         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1660 
1661         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1662                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1663                 return 0;
1664         }
1665 
1666         if (rc) {
1667                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1668                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1669         } else {
1670                 *nbytes = le32_to_cpu(rsp->DataLength);
1671                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1672                     (*nbytes > io_parms->length)) {
1673                         cifs_dbg(FYI, "bad length %d for count %d\n",
1674                                  *nbytes, io_parms->length);
1675                         rc = -EIO;
1676                         *nbytes = 0;
1677                 }
1678         }
1679 
1680         if (*buf) {
1681                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1682                        *nbytes);
1683                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1684         } else if (resp_buftype != CIFS_NO_BUFFER) {
1685                 *buf = iov[0].iov_base;
1686                 if (resp_buftype == CIFS_SMALL_BUFFER)
1687                         *buf_type = CIFS_SMALL_BUFFER;
1688                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1689                         *buf_type = CIFS_LARGE_BUFFER;
1690         }
1691         return rc;
1692 }
1693 
1694 /*
1695  * Check the mid_state and signature on received buffer (if any), and queue the
1696  * workqueue completion task.
1697  */
1698 static void
1699 smb2_writev_callback(struct mid_q_entry *mid)
1700 {
1701         struct cifs_writedata *wdata = mid->callback_data;
1702         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1703         unsigned int written;
1704         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1705         unsigned int credits_received = 1;
1706 
1707         switch (mid->mid_state) {
1708         case MID_RESPONSE_RECEIVED:
1709                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1710                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1711                 if (wdata->result != 0)
1712                         break;
1713 
1714                 written = le32_to_cpu(rsp->DataLength);
1715                 /*
1716                  * Mask off high 16 bits when bytes written as returned
1717                  * by the server is greater than bytes requested by the
1718                  * client. OS/2 servers are known to set incorrect
1719                  * CountHigh values.
1720                  */
1721                 if (written > wdata->bytes)
1722                         written &= 0xFFFF;
1723 
1724                 if (written < wdata->bytes)
1725                         wdata->result = -ENOSPC;
1726                 else
1727                         wdata->bytes = written;
1728                 break;
1729         case MID_REQUEST_SUBMITTED:
1730         case MID_RETRY_NEEDED:
1731                 wdata->result = -EAGAIN;
1732                 break;
1733         default:
1734                 wdata->result = -EIO;
1735                 break;
1736         }
1737 
1738         if (wdata->result)
1739                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1740 
1741         queue_work(cifsiod_wq, &wdata->work);
1742         DeleteMidQEntry(mid);
1743         add_credits(tcon->ses->server, credits_received, 0);
1744 }
1745 
1746 /* smb2_async_writev - send an async write, and set up mid to handle result */
1747 int
1748 smb2_async_writev(struct cifs_writedata *wdata)
1749 {
1750         int rc = -EACCES;
1751         struct smb2_write_req *req = NULL;
1752         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1753         struct kvec iov;
1754         struct smb_rqst rqst;
1755 
1756         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1757         if (rc)
1758                 goto async_writev_out;
1759 
1760         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1761 
1762         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1763         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1764         req->WriteChannelInfoOffset = 0;
1765         req->WriteChannelInfoLength = 0;
1766         req->Channel = 0;
1767         req->Offset = cpu_to_le64(wdata->offset);
1768         /* 4 for rfc1002 length field */
1769         req->DataOffset = cpu_to_le16(
1770                                 offsetof(struct smb2_write_req, Buffer) - 4);
1771         req->RemainingBytes = 0;
1772 
1773         /* 4 for rfc1002 length field and 1 for Buffer */
1774         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1775         iov.iov_base = req;
1776 
1777         rqst.rq_iov = &iov;
1778         rqst.rq_nvec = 1;
1779         rqst.rq_pages = wdata->pages;
1780         rqst.rq_npages = wdata->nr_pages;
1781         rqst.rq_pagesz = wdata->pagesz;
1782         rqst.rq_tailsz = wdata->tailsz;
1783 
1784         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1785                  wdata->offset, wdata->bytes);
1786 
1787         req->Length = cpu_to_le32(wdata->bytes);
1788 
1789         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1790 
1791         kref_get(&wdata->refcount);
1792         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1793                                 smb2_writev_callback, wdata, 0);
1794 
1795         if (rc) {
1796                 kref_put(&wdata->refcount, cifs_writedata_release);
1797                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1798         }
1799 
1800 async_writev_out:
1801         cifs_small_buf_release(req);
1802         return rc;
1803 }
1804 
1805 /*
1806  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1807  * The length field from io_parms must be at least 1 and indicates a number of
1808  * elements with data to write that begins with position 1 in iov array. All
1809  * data length is specified by count.
1810  */
1811 int
1812 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1813            unsigned int *nbytes, struct kvec *iov, int n_vec)
1814 {
1815         int rc = 0;
1816         struct smb2_write_req *req = NULL;
1817         struct smb2_write_rsp *rsp = NULL;
1818         int resp_buftype;
1819         *nbytes = 0;
1820 
1821         if (n_vec < 1)
1822                 return rc;
1823 
1824         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1825         if (rc)
1826                 return rc;
1827 
1828         if (io_parms->tcon->ses->server == NULL)
1829                 return -ECONNABORTED;
1830 
1831         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1832 
1833         req->PersistentFileId = io_parms->persistent_fid;
1834         req->VolatileFileId = io_parms->volatile_fid;
1835         req->WriteChannelInfoOffset = 0;
1836         req->WriteChannelInfoLength = 0;
1837         req->Channel = 0;
1838         req->Length = cpu_to_le32(io_parms->length);
1839         req->Offset = cpu_to_le64(io_parms->offset);
1840         /* 4 for rfc1002 length field */
1841         req->DataOffset = cpu_to_le16(
1842                                 offsetof(struct smb2_write_req, Buffer) - 4);
1843         req->RemainingBytes = 0;
1844 
1845         iov[0].iov_base = (char *)req;
1846         /* 4 for rfc1002 length field and 1 for Buffer */
1847         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1848 
1849         /* length of entire message including data to be written */
1850         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1851 
1852         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1853                           &resp_buftype, 0);
1854         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1855 
1856         if (rc) {
1857                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1858                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1859         } else
1860                 *nbytes = le32_to_cpu(rsp->DataLength);
1861 
1862         free_rsp_buf(resp_buftype, rsp);
1863         return rc;
1864 }
1865 
1866 static unsigned int
1867 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1868 {
1869         int len;
1870         unsigned int entrycount = 0;
1871         unsigned int next_offset = 0;
1872         FILE_DIRECTORY_INFO *entryptr;
1873 
1874         if (bufstart == NULL)
1875                 return 0;
1876 
1877         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1878 
1879         while (1) {
1880                 entryptr = (FILE_DIRECTORY_INFO *)
1881                                         ((char *)entryptr + next_offset);
1882 
1883                 if ((char *)entryptr + size > end_of_buf) {
1884                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1885                         break;
1886                 }
1887 
1888                 len = le32_to_cpu(entryptr->FileNameLength);
1889                 if ((char *)entryptr + len + size > end_of_buf) {
1890                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1891                                  end_of_buf);
1892                         break;
1893                 }
1894 
1895                 *lastentry = (char *)entryptr;
1896                 entrycount++;
1897 
1898                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1899                 if (!next_offset)
1900                         break;
1901         }
1902 
1903         return entrycount;
1904 }
1905 
1906 /*
1907  * Readdir/FindFirst
1908  */
1909 int
1910 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1911                      u64 persistent_fid, u64 volatile_fid, int index,
1912                      struct cifs_search_info *srch_inf)
1913 {
1914         struct smb2_query_directory_req *req;
1915         struct smb2_query_directory_rsp *rsp = NULL;
1916         struct kvec iov[2];
1917         int rc = 0;
1918         int len;
1919         int resp_buftype;
1920         unsigned char *bufptr;
1921         struct TCP_Server_Info *server;
1922         struct cifs_ses *ses = tcon->ses;
1923         __le16 asteriks = cpu_to_le16('*');
1924         char *end_of_smb;
1925         unsigned int output_size = CIFSMaxBufSize;
1926         size_t info_buf_size;
1927 
1928         if (ses && (ses->server))
1929                 server = ses->server;
1930         else
1931                 return -EIO;
1932 
1933         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1934         if (rc)
1935                 return rc;
1936 
1937         switch (srch_inf->info_level) {
1938         case SMB_FIND_FILE_DIRECTORY_INFO:
1939                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1940                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1941                 break;
1942         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1943                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1944                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1945                 break;
1946         default:
1947                 cifs_dbg(VFS, "info level %u isn't supported\n",
1948                          srch_inf->info_level);
1949                 rc = -EINVAL;
1950                 goto qdir_exit;
1951         }
1952 
1953         req->FileIndex = cpu_to_le32(index);
1954         req->PersistentFileId = persistent_fid;
1955         req->VolatileFileId = volatile_fid;
1956 
1957         len = 0x2;
1958         bufptr = req->Buffer;
1959         memcpy(bufptr, &asteriks, len);
1960 
1961         req->FileNameOffset =
1962                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1963         req->FileNameLength = cpu_to_le16(len);
1964         /*
1965          * BB could be 30 bytes or so longer if we used SMB2 specific
1966          * buffer lengths, but this is safe and close enough.
1967          */
1968         output_size = min_t(unsigned int, output_size, server->maxBuf);
1969         output_size = min_t(unsigned int, output_size, 2 << 15);
1970         req->OutputBufferLength = cpu_to_le32(output_size);
1971 
1972         iov[0].iov_base = (char *)req;
1973         /* 4 for RFC1001 length and 1 for Buffer */
1974         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1975 
1976         iov[1].iov_base = (char *)(req->Buffer);
1977         iov[1].iov_len = len;
1978 
1979         inc_rfc1001_len(req, len - 1 /* Buffer */);
1980 
1981         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1982         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1983 
1984         if (rc) {
1985                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1986                 goto qdir_exit;
1987         }
1988 
1989         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1990                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1991                           info_buf_size);
1992         if (rc)
1993                 goto qdir_exit;
1994 
1995         srch_inf->unicode = true;
1996 
1997         if (srch_inf->ntwrk_buf_start) {
1998                 if (srch_inf->smallBuf)
1999                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2000                 else
2001                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2002         }
2003         srch_inf->ntwrk_buf_start = (char *)rsp;
2004         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2005                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2006         /* 4 for rfc1002 length field */
2007         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2008         srch_inf->entries_in_buffer =
2009                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2010                                     &srch_inf->last_entry, info_buf_size);
2011         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2012         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2013                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2014                  srch_inf->srch_entries_start, srch_inf->last_entry);
2015         if (resp_buftype == CIFS_LARGE_BUFFER)
2016                 srch_inf->smallBuf = false;
2017         else if (resp_buftype == CIFS_SMALL_BUFFER)
2018                 srch_inf->smallBuf = true;
2019         else
2020                 cifs_dbg(VFS, "illegal search buffer type\n");
2021 
2022         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2023                 srch_inf->endOfSearch = 1;
2024         else
2025                 srch_inf->endOfSearch = 0;
2026 
2027         return rc;
2028 
2029 qdir_exit:
2030         free_rsp_buf(resp_buftype, rsp);
2031         return rc;
2032 }
2033 
2034 static int
2035 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2036                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2037                unsigned int num, void **data, unsigned int *size)
2038 {
2039         struct smb2_set_info_req *req;
2040         struct smb2_set_info_rsp *rsp = NULL;
2041         struct kvec *iov;
2042         int rc = 0;
2043         int resp_buftype;
2044         unsigned int i;
2045         struct TCP_Server_Info *server;
2046         struct cifs_ses *ses = tcon->ses;
2047 
2048         if (ses && (ses->server))
2049                 server = ses->server;
2050         else
2051                 return -EIO;
2052 
2053         if (!num)
2054                 return -EINVAL;
2055 
2056         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2057         if (!iov)
2058                 return -ENOMEM;
2059 
2060         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2061         if (rc) {
2062                 kfree(iov);
2063                 return rc;
2064         }
2065 
2066         req->hdr.ProcessId = cpu_to_le32(pid);
2067 
2068         req->InfoType = SMB2_O_INFO_FILE;
2069         req->FileInfoClass = info_class;
2070         req->PersistentFileId = persistent_fid;
2071         req->VolatileFileId = volatile_fid;
2072 
2073         /* 4 for RFC1001 length and 1 for Buffer */
2074         req->BufferOffset =
2075                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2076         req->BufferLength = cpu_to_le32(*size);
2077 
2078         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2079 
2080         memcpy(req->Buffer, *data, *size);
2081 
2082         iov[0].iov_base = (char *)req;
2083         /* 4 for RFC1001 length */
2084         iov[0].iov_len = get_rfc1002_length(req) + 4;
2085 
2086         for (i = 1; i < num; i++) {
2087                 inc_rfc1001_len(req, size[i]);
2088                 le32_add_cpu(&req->BufferLength, size[i]);
2089                 iov[i].iov_base = (char *)data[i];
2090                 iov[i].iov_len = size[i];
2091         }
2092 
2093         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2094         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2095 
2096         if (rc != 0) {
2097                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2098                 goto out;
2099         }
2100 out:
2101         free_rsp_buf(resp_buftype, rsp);
2102         kfree(iov);
2103         return rc;
2104 }
2105 
2106 int
2107 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2108             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2109 {
2110         struct smb2_file_rename_info info;
2111         void **data;
2112         unsigned int size[2];
2113         int rc;
2114         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2115 
2116         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2117         if (!data)
2118                 return -ENOMEM;
2119 
2120         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2121                               /* 0 = fail if target already exists */
2122         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2123         info.FileNameLength = cpu_to_le32(len);
2124 
2125         data[0] = &info;
2126         size[0] = sizeof(struct smb2_file_rename_info);
2127 
2128         data[1] = target_file;
2129         size[1] = len + 2 /* null */;
2130 
2131         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2132                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2133                            size);
2134         kfree(data);
2135         return rc;
2136 }
2137 
2138 int
2139 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2140                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2141 {
2142         struct smb2_file_link_info info;
2143         void **data;
2144         unsigned int size[2];
2145         int rc;
2146         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2147 
2148         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2149         if (!data)
2150                 return -ENOMEM;
2151 
2152         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2153                               /* 0 = fail if link already exists */
2154         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2155         info.FileNameLength = cpu_to_le32(len);
2156 
2157         data[0] = &info;
2158         size[0] = sizeof(struct smb2_file_link_info);
2159 
2160         data[1] = target_file;
2161         size[1] = len + 2 /* null */;
2162 
2163         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2164                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2165         kfree(data);
2166         return rc;
2167 }
2168 
2169 int
2170 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2171              u64 volatile_fid, u32 pid, __le64 *eof)
2172 {
2173         struct smb2_file_eof_info info;
2174         void *data;
2175         unsigned int size;
2176 
2177         info.EndOfFile = *eof;
2178 
2179         data = &info;
2180         size = sizeof(struct smb2_file_eof_info);
2181 
2182         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2183                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2184 }
2185 
2186 int
2187 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2188               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2189 {
2190         unsigned int size;
2191         size = sizeof(FILE_BASIC_INFO);
2192         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2193                              current->tgid, FILE_BASIC_INFORMATION, 1,
2194                              (void **)&buf, &size);
2195 }
2196 
2197 int
2198 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2199                   const u64 persistent_fid, const u64 volatile_fid,
2200                   __u8 oplock_level)
2201 {
2202         int rc;
2203         struct smb2_oplock_break *req = NULL;
2204 
2205         cifs_dbg(FYI, "SMB2_oplock_break\n");
2206         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2207 
2208         if (rc)
2209                 return rc;
2210 
2211         req->VolatileFid = volatile_fid;
2212         req->PersistentFid = persistent_fid;
2213         req->OplockLevel = oplock_level;
2214         req->hdr.CreditRequest = cpu_to_le16(1);
2215 
2216         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2217         /* SMB2 buffer freed by function above */
2218 
2219         if (rc) {
2220                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2221                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2222         }
2223 
2224         return rc;
2225 }
2226 
2227 static void
2228 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2229                         struct kstatfs *kst)
2230 {
2231         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2232                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2233         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2234         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2235         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2236         return;
2237 }
2238 
2239 static int
2240 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2241                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2242 {
2243         int rc;
2244         struct smb2_query_info_req *req;
2245 
2246         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2247 
2248         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2249                 return -EIO;
2250 
2251         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2252         if (rc)
2253                 return rc;
2254 
2255         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2256         req->FileInfoClass = level;
2257         req->PersistentFileId = persistent_fid;
2258         req->VolatileFileId = volatile_fid;
2259         /* 4 for rfc1002 length field and 1 for pad */
2260         req->InputBufferOffset =
2261                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2262         req->OutputBufferLength = cpu_to_le32(
2263                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2264 
2265         iov->iov_base = (char *)req;
2266         /* 4 for rfc1002 length field */
2267         iov->iov_len = get_rfc1002_length(req) + 4;
2268         return 0;
2269 }
2270 
2271 int
2272 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2273               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2274 {
2275         struct smb2_query_info_rsp *rsp = NULL;
2276         struct kvec iov;
2277         int rc = 0;
2278         int resp_buftype;
2279         struct cifs_ses *ses = tcon->ses;
2280         struct smb2_fs_full_size_info *info = NULL;
2281 
2282         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2283                                 sizeof(struct smb2_fs_full_size_info),
2284                                 persistent_fid, volatile_fid);
2285         if (rc)
2286                 return rc;
2287 
2288         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2289         if (rc) {
2290                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2291                 goto qinf_exit;
2292         }
2293         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2294 
2295         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2296                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2297         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2298                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2299                           sizeof(struct smb2_fs_full_size_info));
2300         if (!rc)
2301                 copy_fs_info_to_kstatfs(info, fsdata);
2302 
2303 qinf_exit:
2304         free_rsp_buf(resp_buftype, iov.iov_base);
2305         return rc;
2306 }
2307 
2308 int
2309 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2310            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2311            const __u32 num_lock, struct smb2_lock_element *buf)
2312 {
2313         int rc = 0;
2314         struct smb2_lock_req *req = NULL;
2315         struct kvec iov[2];
2316         int resp_buf_type;
2317         unsigned int count;
2318 
2319         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2320 
2321         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2322         if (rc)
2323                 return rc;
2324 
2325         req->hdr.ProcessId = cpu_to_le32(pid);
2326         req->LockCount = cpu_to_le16(num_lock);
2327 
2328         req->PersistentFileId = persist_fid;
2329         req->VolatileFileId = volatile_fid;
2330 
2331         count = num_lock * sizeof(struct smb2_lock_element);
2332         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2333 
2334         iov[0].iov_base = (char *)req;
2335         /* 4 for rfc1002 length field and count for all locks */
2336         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2337         iov[1].iov_base = (char *)buf;
2338         iov[1].iov_len = count;
2339 
2340         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2341         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2342         if (rc) {
2343                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2344                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2345         }
2346 
2347         return rc;
2348 }
2349 
2350 int
2351 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2352           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2353           const __u64 length, const __u64 offset, const __u32 lock_flags,
2354           const bool wait)
2355 {
2356         struct smb2_lock_element lock;
2357 
2358         lock.Offset = cpu_to_le64(offset);
2359         lock.Length = cpu_to_le64(length);
2360         lock.Flags = cpu_to_le32(lock_flags);
2361         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2362                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2363 
2364         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2365 }
2366 
2367 int
2368 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2369                  __u8 *lease_key, const __le32 lease_state)
2370 {
2371         int rc;
2372         struct smb2_lease_ack *req = NULL;
2373 
2374         cifs_dbg(FYI, "SMB2_lease_break\n");
2375         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2376 
2377         if (rc)
2378                 return rc;
2379 
2380         req->hdr.CreditRequest = cpu_to_le16(1);
2381         req->StructureSize = cpu_to_le16(36);
2382         inc_rfc1001_len(req, 12);
2383 
2384         memcpy(req->LeaseKey, lease_key, 16);
2385         req->LeaseState = lease_state;
2386 
2387         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2388         /* SMB2 buffer freed by function above */
2389 
2390         if (rc) {
2391                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2392                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2393         }
2394 
2395         return rc;
2396 }
2397 

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