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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/uuid.h>
 37 #include <linux/pagemap.h>
 38 #include <linux/xattr.h>
 39 #include "smb2pdu.h"
 40 #include "cifsglob.h"
 41 #include "cifsacl.h"
 42 #include "cifsproto.h"
 43 #include "smb2proto.h"
 44 #include "cifs_unicode.h"
 45 #include "cifs_debug.h"
 46 #include "ntlmssp.h"
 47 #include "smb2status.h"
 48 #include "smb2glob.h"
 49 #include "cifspdu.h"
 50 #include "cifs_spnego.h"
 51 
 52 /*
 53  *  The following table defines the expected "StructureSize" of SMB2 requests
 54  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 55  *
 56  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 57  *  indexed by command in host byte order.
 58  */
 59 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
 60         /* SMB2_NEGOTIATE */ 36,
 61         /* SMB2_SESSION_SETUP */ 25,
 62         /* SMB2_LOGOFF */ 4,
 63         /* SMB2_TREE_CONNECT */ 9,
 64         /* SMB2_TREE_DISCONNECT */ 4,
 65         /* SMB2_CREATE */ 57,
 66         /* SMB2_CLOSE */ 24,
 67         /* SMB2_FLUSH */ 24,
 68         /* SMB2_READ */ 49,
 69         /* SMB2_WRITE */ 49,
 70         /* SMB2_LOCK */ 48,
 71         /* SMB2_IOCTL */ 57,
 72         /* SMB2_CANCEL */ 4,
 73         /* SMB2_ECHO */ 4,
 74         /* SMB2_QUERY_DIRECTORY */ 33,
 75         /* SMB2_CHANGE_NOTIFY */ 32,
 76         /* SMB2_QUERY_INFO */ 41,
 77         /* SMB2_SET_INFO */ 33,
 78         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
 79 };
 80 
 81 static int encryption_required(const struct cifs_tcon *tcon)
 82 {
 83         if (!tcon)
 84                 return 0;
 85         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
 86             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
 87                 return 1;
 88         if (tcon->seal &&
 89             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 90                 return 1;
 91         return 0;
 92 }
 93 
 94 static void
 95 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 96                   const struct cifs_tcon *tcon)
 97 {
 98         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 99         shdr->StructureSize = cpu_to_le16(64);
100         shdr->Command = smb2_cmd;
101         if (tcon && tcon->ses && tcon->ses->server) {
102                 struct TCP_Server_Info *server = tcon->ses->server;
103 
104                 spin_lock(&server->req_lock);
105                 /* Request up to 2 credits but don't go over the limit. */
106                 if (server->credits >= server->max_credits)
107                         shdr->CreditRequest = cpu_to_le16(0);
108                 else
109                         shdr->CreditRequest = cpu_to_le16(
110                                 min_t(int, server->max_credits -
111                                                 server->credits, 2));
112                 spin_unlock(&server->req_lock);
113         } else {
114                 shdr->CreditRequest = cpu_to_le16(2);
115         }
116         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
117 
118         if (!tcon)
119                 goto out;
120 
121         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
122         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
123         if ((tcon->ses) && (tcon->ses->server) &&
124             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
125                 shdr->CreditCharge = cpu_to_le16(1);
126         /* else CreditCharge MBZ */
127 
128         shdr->TreeId = tcon->tid;
129         /* Uid is not converted */
130         if (tcon->ses)
131                 shdr->SessionId = tcon->ses->Suid;
132 
133         /*
134          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
135          * to pass the path on the Open SMB prefixed by \\server\share.
136          * Not sure when we would need to do the augmented path (if ever) and
137          * setting this flag breaks the SMB2 open operation since it is
138          * illegal to send an empty path name (without \\server\share prefix)
139          * when the DFS flag is set in the SMB open header. We could
140          * consider setting the flag on all operations other than open
141          * but it is safer to net set it for now.
142          */
143 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
144                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
145 
146         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
147             !encryption_required(tcon))
148                 shdr->Flags |= SMB2_FLAGS_SIGNED;
149 out:
150         return;
151 }
152 
153 static int
154 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
155 {
156         int rc = 0;
157         struct nls_table *nls_codepage;
158         struct cifs_ses *ses;
159         struct TCP_Server_Info *server;
160 
161         /*
162          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
163          * check for tcp and smb session status done differently
164          * for those three - in the calling routine.
165          */
166         if (tcon == NULL)
167                 return rc;
168 
169         if (smb2_command == SMB2_TREE_CONNECT)
170                 return rc;
171 
172         if (tcon->tidStatus == CifsExiting) {
173                 /*
174                  * only tree disconnect, open, and write,
175                  * (and ulogoff which does not have tcon)
176                  * are allowed as we start force umount.
177                  */
178                 if ((smb2_command != SMB2_WRITE) &&
179                    (smb2_command != SMB2_CREATE) &&
180                    (smb2_command != SMB2_TREE_DISCONNECT)) {
181                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
182                                  smb2_command);
183                         return -ENODEV;
184                 }
185         }
186         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
187             (!tcon->ses->server))
188                 return -EIO;
189 
190         ses = tcon->ses;
191         server = ses->server;
192 
193         /*
194          * Give demultiplex thread up to 10 seconds to reconnect, should be
195          * greater than cifs socket timeout which is 7 seconds
196          */
197         while (server->tcpStatus == CifsNeedReconnect) {
198                 /*
199                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
200                  * here since they are implicitly done when session drops.
201                  */
202                 switch (smb2_command) {
203                 /*
204                  * BB Should we keep oplock break and add flush to exceptions?
205                  */
206                 case SMB2_TREE_DISCONNECT:
207                 case SMB2_CANCEL:
208                 case SMB2_CLOSE:
209                 case SMB2_OPLOCK_BREAK:
210                         return -EAGAIN;
211                 }
212 
213                 wait_event_interruptible_timeout(server->response_q,
214                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
215 
216                 /* are we still trying to reconnect? */
217                 if (server->tcpStatus != CifsNeedReconnect)
218                         break;
219 
220                 /*
221                  * on "soft" mounts we wait once. Hard mounts keep
222                  * retrying until process is killed or server comes
223                  * back on-line
224                  */
225                 if (!tcon->retry) {
226                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
227                         return -EHOSTDOWN;
228                 }
229         }
230 
231         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
232                 return rc;
233 
234         nls_codepage = load_nls_default();
235 
236         /*
237          * need to prevent multiple threads trying to simultaneously reconnect
238          * the same SMB session
239          */
240         mutex_lock(&tcon->ses->session_mutex);
241 
242         /*
243          * Recheck after acquire mutex. If another thread is negotiating
244          * and the server never sends an answer the socket will be closed
245          * and tcpStatus set to reconnect.
246          */
247         if (server->tcpStatus == CifsNeedReconnect) {
248                 rc = -EHOSTDOWN;
249                 mutex_unlock(&tcon->ses->session_mutex);
250                 goto out;
251         }
252 
253         rc = cifs_negotiate_protocol(0, tcon->ses);
254         if (!rc && tcon->ses->need_reconnect)
255                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
256 
257         if (rc || !tcon->need_reconnect) {
258                 mutex_unlock(&tcon->ses->session_mutex);
259                 goto out;
260         }
261 
262         cifs_mark_open_files_invalid(tcon);
263         if (tcon->use_persistent)
264                 tcon->need_reopen_files = true;
265 
266         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
267         mutex_unlock(&tcon->ses->session_mutex);
268 
269         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
270         if (rc)
271                 goto out;
272 
273         if (smb2_command != SMB2_INTERNAL_CMD)
274                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
275 
276         atomic_inc(&tconInfoReconnectCount);
277 out:
278         /*
279          * Check if handle based operation so we know whether we can continue
280          * or not without returning to caller to reset file handle.
281          */
282         /*
283          * BB Is flush done by server on drop of tcp session? Should we special
284          * case it and skip above?
285          */
286         switch (smb2_command) {
287         case SMB2_FLUSH:
288         case SMB2_READ:
289         case SMB2_WRITE:
290         case SMB2_LOCK:
291         case SMB2_IOCTL:
292         case SMB2_QUERY_DIRECTORY:
293         case SMB2_CHANGE_NOTIFY:
294         case SMB2_QUERY_INFO:
295         case SMB2_SET_INFO:
296                 rc = -EAGAIN;
297         }
298         unload_nls(nls_codepage);
299         return rc;
300 }
301 
302 static void
303 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
304                unsigned int *total_len)
305 {
306         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
307         /* lookup word count ie StructureSize from table */
308         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
309 
310         /*
311          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
312          * largest operations (Create)
313          */
314         memset(buf, 0, 256);
315 
316         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
317         spdu->StructureSize2 = cpu_to_le16(parmsize);
318 
319         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
320 }
321 
322 /* init request without RFC1001 length at the beginning */
323 static int
324 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
325                     void **request_buf, unsigned int *total_len)
326 {
327         int rc;
328         struct smb2_sync_hdr *shdr;
329 
330         rc = smb2_reconnect(smb2_command, tcon);
331         if (rc)
332                 return rc;
333 
334         /* BB eventually switch this to SMB2 specific small buf size */
335         *request_buf = cifs_small_buf_get();
336         if (*request_buf == NULL) {
337                 /* BB should we add a retry in here if not a writepage? */
338                 return -ENOMEM;
339         }
340 
341         shdr = (struct smb2_sync_hdr *)(*request_buf);
342 
343         fill_small_buf(smb2_command, tcon, shdr, total_len);
344 
345         if (tcon != NULL) {
346 #ifdef CONFIG_CIFS_STATS2
347                 uint16_t com_code = le16_to_cpu(smb2_command);
348 
349                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
350 #endif
351                 cifs_stats_inc(&tcon->num_smbs_sent);
352         }
353 
354         return rc;
355 }
356 
357 /*
358  * Allocate and return pointer to an SMB request hdr, and set basic
359  * SMB information in the SMB header. If the return code is zero, this
360  * function must have filled in request_buf pointer. The returned buffer
361  * has RFC1001 length at the beginning.
362  */
363 static int
364 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
365                 void **request_buf)
366 {
367         int rc;
368         unsigned int total_len;
369         struct smb2_pdu *pdu;
370 
371         rc = smb2_reconnect(smb2_command, tcon);
372         if (rc)
373                 return rc;
374 
375         /* BB eventually switch this to SMB2 specific small buf size */
376         *request_buf = cifs_small_buf_get();
377         if (*request_buf == NULL) {
378                 /* BB should we add a retry in here if not a writepage? */
379                 return -ENOMEM;
380         }
381 
382         pdu = (struct smb2_pdu *)(*request_buf);
383 
384         fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
385 
386         /* Note this is only network field converted to big endian */
387         pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
388 
389         if (tcon != NULL) {
390 #ifdef CONFIG_CIFS_STATS2
391                 uint16_t com_code = le16_to_cpu(smb2_command);
392                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
393 #endif
394                 cifs_stats_inc(&tcon->num_smbs_sent);
395         }
396 
397         return rc;
398 }
399 
400 #ifdef CONFIG_CIFS_SMB311
401 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
402 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
403 
404 
405 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
406 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
407 
408 static void
409 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
410 {
411         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
412         pneg_ctxt->DataLength = cpu_to_le16(38);
413         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
414         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
415         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
416         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
417 }
418 
419 static void
420 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
421 {
422         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
423         pneg_ctxt->DataLength = cpu_to_le16(6);
424         pneg_ctxt->CipherCount = cpu_to_le16(2);
425         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
426         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
427 }
428 
429 static void
430 assemble_neg_contexts(struct smb2_negotiate_req *req)
431 {
432 
433         /* +4 is to account for the RFC1001 len field */
434         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
435 
436         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
437         /* Add 2 to size to round to 8 byte boundary */
438         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
439         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
440         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
441         req->NegotiateContextCount = cpu_to_le16(2);
442         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context)
443                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
444 }
445 #else
446 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
447 {
448         return;
449 }
450 #endif /* SMB311 */
451 
452 /*
453  *
454  *      SMB2 Worker functions follow:
455  *
456  *      The general structure of the worker functions is:
457  *      1) Call smb2_init (assembles SMB2 header)
458  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
459  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
460  *      4) Decode SMB2 command specific fields in the fixed length area
461  *      5) Decode variable length data area (if any for this SMB2 command type)
462  *      6) Call free smb buffer
463  *      7) return
464  *
465  */
466 
467 int
468 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
469 {
470         struct smb2_negotiate_req *req;
471         struct smb2_negotiate_rsp *rsp;
472         struct kvec iov[1];
473         struct kvec rsp_iov;
474         int rc = 0;
475         int resp_buftype;
476         struct TCP_Server_Info *server = ses->server;
477         int blob_offset, blob_length;
478         char *security_blob;
479         int flags = CIFS_NEG_OP;
480 
481         cifs_dbg(FYI, "Negotiate protocol\n");
482 
483         if (!server) {
484                 WARN(1, "%s: server is NULL!\n", __func__);
485                 return -EIO;
486         }
487 
488         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
489         if (rc)
490                 return rc;
491 
492         req->hdr.sync_hdr.SessionId = 0;
493 
494         if (strcmp(ses->server->vals->version_string,
495                    SMB3ANY_VERSION_STRING) == 0) {
496                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
497                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
498                 req->DialectCount = cpu_to_le16(2);
499                 inc_rfc1001_len(req, 4);
500         } else if (strcmp(ses->server->vals->version_string,
501                    SMBDEFAULT_VERSION_STRING) == 0) {
502                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
503                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
504                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
505                 req->DialectCount = cpu_to_le16(3);
506                 inc_rfc1001_len(req, 6);
507         } else {
508                 /* otherwise send specific dialect */
509                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
510                 req->DialectCount = cpu_to_le16(1);
511                 inc_rfc1001_len(req, 2);
512         }
513 
514         /* only one of SMB2 signing flags may be set in SMB2 request */
515         if (ses->sign)
516                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
517         else if (global_secflags & CIFSSEC_MAY_SIGN)
518                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
519         else
520                 req->SecurityMode = 0;
521 
522         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
523 
524         /* ClientGUID must be zero for SMB2.02 dialect */
525         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
526                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
527         else {
528                 memcpy(req->ClientGUID, server->client_guid,
529                         SMB2_CLIENT_GUID_SIZE);
530                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
531                         assemble_neg_contexts(req);
532         }
533         iov[0].iov_base = (char *)req;
534         /* 4 for rfc1002 length field */
535         iov[0].iov_len = get_rfc1002_length(req) + 4;
536 
537         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
538         cifs_small_buf_release(req);
539         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
540         /*
541          * No tcon so can't do
542          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
543          */
544         if (rc == -EOPNOTSUPP) {
545                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
546                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
547                         " older servers\n");
548                 goto neg_exit;
549         } else if (rc != 0)
550                 goto neg_exit;
551 
552         if (strcmp(ses->server->vals->version_string,
553                    SMB3ANY_VERSION_STRING) == 0) {
554                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
555                         cifs_dbg(VFS,
556                                 "SMB2 dialect returned but not requested\n");
557                         return -EIO;
558                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
559                         cifs_dbg(VFS,
560                                 "SMB2.1 dialect returned but not requested\n");
561                         return -EIO;
562                 }
563         } else if (strcmp(ses->server->vals->version_string,
564                    SMBDEFAULT_VERSION_STRING) == 0) {
565                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
566                         cifs_dbg(VFS,
567                                 "SMB2 dialect returned but not requested\n");
568                         return -EIO;
569                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
570                         /* ops set to 3.0 by default for default so update */
571                         ses->server->ops = &smb21_operations;
572                 }
573         } else if (le16_to_cpu(rsp->DialectRevision) !=
574                                 ses->server->vals->protocol_id) {
575                 /* if requested single dialect ensure returned dialect matched */
576                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
577                         le16_to_cpu(rsp->DialectRevision));
578                 return -EIO;
579         }
580 
581         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
582 
583         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
584                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
585         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
586                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
587         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
588                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
589         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
590                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
591 #ifdef CONFIG_CIFS_SMB311
592         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
593                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
594 #endif /* SMB311 */
595         else {
596                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
597                          le16_to_cpu(rsp->DialectRevision));
598                 rc = -EIO;
599                 goto neg_exit;
600         }
601         server->dialect = le16_to_cpu(rsp->DialectRevision);
602 
603         /* BB: add check that dialect was valid given dialect(s) we asked for */
604 
605         /* SMB2 only has an extended negflavor */
606         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
607         /* set it to the maximum buffer size value we can send with 1 credit */
608         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
609                                SMB2_MAX_BUFFER_SIZE);
610         server->max_read = le32_to_cpu(rsp->MaxReadSize);
611         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
612         /* BB Do we need to validate the SecurityMode? */
613         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
614         server->capabilities = le32_to_cpu(rsp->Capabilities);
615         /* Internal types */
616         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
617 
618         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
619                                                &rsp->hdr);
620         /*
621          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
622          * for us will be
623          *      ses->sectype = RawNTLMSSP;
624          * but for time being this is our only auth choice so doesn't matter.
625          * We just found a server which sets blob length to zero expecting raw.
626          */
627         if (blob_length == 0) {
628                 cifs_dbg(FYI, "missing security blob on negprot\n");
629                 server->sec_ntlmssp = true;
630         }
631 
632         rc = cifs_enable_signing(server, ses->sign);
633         if (rc)
634                 goto neg_exit;
635         if (blob_length) {
636                 rc = decode_negTokenInit(security_blob, blob_length, server);
637                 if (rc == 1)
638                         rc = 0;
639                 else if (rc == 0)
640                         rc = -EIO;
641         }
642 neg_exit:
643         free_rsp_buf(resp_buftype, rsp);
644         return rc;
645 }
646 
647 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
648 {
649         int rc = 0;
650         struct validate_negotiate_info_req vneg_inbuf;
651         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
652         u32 rsplen;
653         u32 inbuflen; /* max of 4 dialects */
654 
655         cifs_dbg(FYI, "validate negotiate\n");
656 
657         /*
658          * validation ioctl must be signed, so no point sending this if we
659          * can not sign it (ie are not known user).  Even if signing is not
660          * required (enabled but not negotiated), in those cases we selectively
661          * sign just this, the first and only signed request on a connection.
662          * Having validation of negotiate info  helps reduce attack vectors.
663          */
664         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
665                 return 0; /* validation requires signing */
666 
667         if (tcon->ses->user_name == NULL) {
668                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
669                 return 0; /* validation requires signing */
670         }
671 
672         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
673                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
674 
675         vneg_inbuf.Capabilities =
676                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
677         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
678                                         SMB2_CLIENT_GUID_SIZE);
679 
680         if (tcon->ses->sign)
681                 vneg_inbuf.SecurityMode =
682                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
683         else if (global_secflags & CIFSSEC_MAY_SIGN)
684                 vneg_inbuf.SecurityMode =
685                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
686         else
687                 vneg_inbuf.SecurityMode = 0;
688 
689 
690         if (strcmp(tcon->ses->server->vals->version_string,
691                 SMB3ANY_VERSION_STRING) == 0) {
692                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
693                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
694                 vneg_inbuf.DialectCount = cpu_to_le16(2);
695                 /* structure is big enough for 3 dialects, sending only 2 */
696                 inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
697         } else if (strcmp(tcon->ses->server->vals->version_string,
698                 SMBDEFAULT_VERSION_STRING) == 0) {
699                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
700                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
701                 vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
702                 vneg_inbuf.DialectCount = cpu_to_le16(3);
703                 /* structure is big enough for 3 dialects */
704                 inbuflen = sizeof(struct validate_negotiate_info_req);
705         } else {
706                 /* otherwise specific dialect was requested */
707                 vneg_inbuf.Dialects[0] =
708                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
709                 vneg_inbuf.DialectCount = cpu_to_le16(1);
710                 /* structure is big enough for 3 dialects, sending only 1 */
711                 inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
712         }
713 
714         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
715                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
716                 false /* use_ipc */,
717                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
718                 (char **)&pneg_rsp, &rsplen);
719 
720         if (rc != 0) {
721                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
722                 return -EIO;
723         }
724 
725         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
726                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
727                          rsplen);
728 
729                 /* relax check since Mac returns max bufsize allowed on ioctl */
730                 if ((rsplen > CIFSMaxBufSize)
731                      || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
732                         goto err_rsp_free;
733         }
734 
735         /* check validate negotiate info response matches what we got earlier */
736         if (pneg_rsp->Dialect !=
737                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
738                 goto vneg_out;
739 
740         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
741                 goto vneg_out;
742 
743         /* do not validate server guid because not saved at negprot time yet */
744 
745         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
746               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
747                 goto vneg_out;
748 
749         /* validate negotiate successful */
750         cifs_dbg(FYI, "validate negotiate info successful\n");
751         kfree(pneg_rsp);
752         return 0;
753 
754 vneg_out:
755         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
756 err_rsp_free:
757         kfree(pneg_rsp);
758         return -EIO;
759 }
760 
761 enum securityEnum
762 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
763 {
764         switch (requested) {
765         case Kerberos:
766         case RawNTLMSSP:
767                 return requested;
768         case NTLMv2:
769                 return RawNTLMSSP;
770         case Unspecified:
771                 if (server->sec_ntlmssp &&
772                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
773                         return RawNTLMSSP;
774                 if ((server->sec_kerberos || server->sec_mskerberos) &&
775                         (global_secflags & CIFSSEC_MAY_KRB5))
776                         return Kerberos;
777                 /* Fallthrough */
778         default:
779                 return Unspecified;
780         }
781 }
782 
783 struct SMB2_sess_data {
784         unsigned int xid;
785         struct cifs_ses *ses;
786         struct nls_table *nls_cp;
787         void (*func)(struct SMB2_sess_data *);
788         int result;
789         u64 previous_session;
790 
791         /* we will send the SMB in three pieces:
792          * a fixed length beginning part, an optional
793          * SPNEGO blob (which can be zero length), and a
794          * last part which will include the strings
795          * and rest of bcc area. This allows us to avoid
796          * a large buffer 17K allocation
797          */
798         int buf0_type;
799         struct kvec iov[2];
800 };
801 
802 static int
803 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
804 {
805         int rc;
806         struct cifs_ses *ses = sess_data->ses;
807         struct smb2_sess_setup_req *req;
808         struct TCP_Server_Info *server = ses->server;
809 
810         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
811         if (rc)
812                 return rc;
813 
814         /* First session, not a reauthenticate */
815         req->hdr.sync_hdr.SessionId = 0;
816 
817         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
818         req->PreviousSessionId = sess_data->previous_session;
819 
820         req->Flags = 0; /* MBZ */
821         /* to enable echos and oplocks */
822         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
823 
824         /* only one of SMB2 signing flags may be set in SMB2 request */
825         if (server->sign)
826                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
827         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
828                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
829         else
830                 req->SecurityMode = 0;
831 
832         req->Capabilities = 0;
833         req->Channel = 0; /* MBZ */
834 
835         sess_data->iov[0].iov_base = (char *)req;
836         /* 4 for rfc1002 length field and 1 for pad */
837         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
838         /*
839          * This variable will be used to clear the buffer
840          * allocated above in case of any error in the calling function.
841          */
842         sess_data->buf0_type = CIFS_SMALL_BUFFER;
843 
844         return 0;
845 }
846 
847 static void
848 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
849 {
850         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
851         sess_data->buf0_type = CIFS_NO_BUFFER;
852 }
853 
854 static int
855 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
856 {
857         int rc;
858         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
859         struct kvec rsp_iov = { NULL, 0 };
860 
861         /* Testing shows that buffer offset must be at location of Buffer[0] */
862         req->SecurityBufferOffset =
863                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
864                         1 /* pad */ - 4 /* rfc1001 len */);
865         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
866 
867         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
868 
869         /* BB add code to build os and lm fields */
870 
871         rc = SendReceive2(sess_data->xid, sess_data->ses,
872                                 sess_data->iov, 2,
873                                 &sess_data->buf0_type,
874                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
875         cifs_small_buf_release(sess_data->iov[0].iov_base);
876         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
877 
878         return rc;
879 }
880 
881 static int
882 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
883 {
884         int rc = 0;
885         struct cifs_ses *ses = sess_data->ses;
886 
887         mutex_lock(&ses->server->srv_mutex);
888         if (ses->server->ops->generate_signingkey) {
889                 rc = ses->server->ops->generate_signingkey(ses);
890                 if (rc) {
891                         cifs_dbg(FYI,
892                                 "SMB3 session key generation failed\n");
893                         mutex_unlock(&ses->server->srv_mutex);
894                         return rc;
895                 }
896         }
897         if (!ses->server->session_estab) {
898                 ses->server->sequence_number = 0x2;
899                 ses->server->session_estab = true;
900         }
901         mutex_unlock(&ses->server->srv_mutex);
902 
903         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
904         spin_lock(&GlobalMid_Lock);
905         ses->status = CifsGood;
906         ses->need_reconnect = false;
907         spin_unlock(&GlobalMid_Lock);
908         return rc;
909 }
910 
911 #ifdef CONFIG_CIFS_UPCALL
912 static void
913 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
914 {
915         int rc;
916         struct cifs_ses *ses = sess_data->ses;
917         struct cifs_spnego_msg *msg;
918         struct key *spnego_key = NULL;
919         struct smb2_sess_setup_rsp *rsp = NULL;
920 
921         rc = SMB2_sess_alloc_buffer(sess_data);
922         if (rc)
923                 goto out;
924 
925         spnego_key = cifs_get_spnego_key(ses);
926         if (IS_ERR(spnego_key)) {
927                 rc = PTR_ERR(spnego_key);
928                 spnego_key = NULL;
929                 goto out;
930         }
931 
932         msg = spnego_key->payload.data[0];
933         /*
934          * check version field to make sure that cifs.upcall is
935          * sending us a response in an expected form
936          */
937         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
938                 cifs_dbg(VFS,
939                           "bad cifs.upcall version. Expected %d got %d",
940                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
941                 rc = -EKEYREJECTED;
942                 goto out_put_spnego_key;
943         }
944 
945         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
946                                          GFP_KERNEL);
947         if (!ses->auth_key.response) {
948                 cifs_dbg(VFS,
949                         "Kerberos can't allocate (%u bytes) memory",
950                         msg->sesskey_len);
951                 rc = -ENOMEM;
952                 goto out_put_spnego_key;
953         }
954         ses->auth_key.len = msg->sesskey_len;
955 
956         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
957         sess_data->iov[1].iov_len = msg->secblob_len;
958 
959         rc = SMB2_sess_sendreceive(sess_data);
960         if (rc)
961                 goto out_put_spnego_key;
962 
963         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
964         ses->Suid = rsp->hdr.sync_hdr.SessionId;
965 
966         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
967 
968         rc = SMB2_sess_establish_session(sess_data);
969 out_put_spnego_key:
970         key_invalidate(spnego_key);
971         key_put(spnego_key);
972 out:
973         sess_data->result = rc;
974         sess_data->func = NULL;
975         SMB2_sess_free_buffer(sess_data);
976 }
977 #else
978 static void
979 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
980 {
981         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
982         sess_data->result = -EOPNOTSUPP;
983         sess_data->func = NULL;
984 }
985 #endif
986 
987 static void
988 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
989 
990 static void
991 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
992 {
993         int rc;
994         struct cifs_ses *ses = sess_data->ses;
995         struct smb2_sess_setup_rsp *rsp = NULL;
996         char *ntlmssp_blob = NULL;
997         bool use_spnego = false; /* else use raw ntlmssp */
998         u16 blob_length = 0;
999 
1000         /*
1001          * If memory allocation is successful, caller of this function
1002          * frees it.
1003          */
1004         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1005         if (!ses->ntlmssp) {
1006                 rc = -ENOMEM;
1007                 goto out_err;
1008         }
1009         ses->ntlmssp->sesskey_per_smbsess = true;
1010 
1011         rc = SMB2_sess_alloc_buffer(sess_data);
1012         if (rc)
1013                 goto out_err;
1014 
1015         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1016                                GFP_KERNEL);
1017         if (ntlmssp_blob == NULL) {
1018                 rc = -ENOMEM;
1019                 goto out;
1020         }
1021 
1022         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1023         if (use_spnego) {
1024                 /* BB eventually need to add this */
1025                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1026                 rc = -EOPNOTSUPP;
1027                 goto out;
1028         } else {
1029                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1030                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1031         }
1032         sess_data->iov[1].iov_base = ntlmssp_blob;
1033         sess_data->iov[1].iov_len = blob_length;
1034 
1035         rc = SMB2_sess_sendreceive(sess_data);
1036         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1037 
1038         /* If true, rc here is expected and not an error */
1039         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1040                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1041                 rc = 0;
1042 
1043         if (rc)
1044                 goto out;
1045 
1046         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
1047                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1048                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1049                         le16_to_cpu(rsp->SecurityBufferOffset));
1050                 rc = -EIO;
1051                 goto out;
1052         }
1053         rc = decode_ntlmssp_challenge(rsp->Buffer,
1054                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1055         if (rc)
1056                 goto out;
1057 
1058         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1059 
1060 
1061         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1062         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1063 
1064 out:
1065         kfree(ntlmssp_blob);
1066         SMB2_sess_free_buffer(sess_data);
1067         if (!rc) {
1068                 sess_data->result = 0;
1069                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1070                 return;
1071         }
1072 out_err:
1073         kfree(ses->ntlmssp);
1074         ses->ntlmssp = NULL;
1075         sess_data->result = rc;
1076         sess_data->func = NULL;
1077 }
1078 
1079 static void
1080 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1081 {
1082         int rc;
1083         struct cifs_ses *ses = sess_data->ses;
1084         struct smb2_sess_setup_req *req;
1085         struct smb2_sess_setup_rsp *rsp = NULL;
1086         unsigned char *ntlmssp_blob = NULL;
1087         bool use_spnego = false; /* else use raw ntlmssp */
1088         u16 blob_length = 0;
1089 
1090         rc = SMB2_sess_alloc_buffer(sess_data);
1091         if (rc)
1092                 goto out;
1093 
1094         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1095         req->hdr.sync_hdr.SessionId = ses->Suid;
1096 
1097         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1098                                         sess_data->nls_cp);
1099         if (rc) {
1100                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1101                 goto out;
1102         }
1103 
1104         if (use_spnego) {
1105                 /* BB eventually need to add this */
1106                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1107                 rc = -EOPNOTSUPP;
1108                 goto out;
1109         }
1110         sess_data->iov[1].iov_base = ntlmssp_blob;
1111         sess_data->iov[1].iov_len = blob_length;
1112 
1113         rc = SMB2_sess_sendreceive(sess_data);
1114         if (rc)
1115                 goto out;
1116 
1117         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1118 
1119         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1120         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1121 
1122         rc = SMB2_sess_establish_session(sess_data);
1123 out:
1124         kfree(ntlmssp_blob);
1125         SMB2_sess_free_buffer(sess_data);
1126         kfree(ses->ntlmssp);
1127         ses->ntlmssp = NULL;
1128         sess_data->result = rc;
1129         sess_data->func = NULL;
1130 }
1131 
1132 static int
1133 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1134 {
1135         int type;
1136 
1137         type = smb2_select_sectype(ses->server, ses->sectype);
1138         cifs_dbg(FYI, "sess setup type %d\n", type);
1139         if (type == Unspecified) {
1140                 cifs_dbg(VFS,
1141                         "Unable to select appropriate authentication method!");
1142                 return -EINVAL;
1143         }
1144 
1145         switch (type) {
1146         case Kerberos:
1147                 sess_data->func = SMB2_auth_kerberos;
1148                 break;
1149         case RawNTLMSSP:
1150                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1151                 break;
1152         default:
1153                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1154                 return -EOPNOTSUPP;
1155         }
1156 
1157         return 0;
1158 }
1159 
1160 int
1161 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1162                 const struct nls_table *nls_cp)
1163 {
1164         int rc = 0;
1165         struct TCP_Server_Info *server = ses->server;
1166         struct SMB2_sess_data *sess_data;
1167 
1168         cifs_dbg(FYI, "Session Setup\n");
1169 
1170         if (!server) {
1171                 WARN(1, "%s: server is NULL!\n", __func__);
1172                 return -EIO;
1173         }
1174 
1175         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1176         if (!sess_data)
1177                 return -ENOMEM;
1178 
1179         rc = SMB2_select_sec(ses, sess_data);
1180         if (rc)
1181                 goto out;
1182         sess_data->xid = xid;
1183         sess_data->ses = ses;
1184         sess_data->buf0_type = CIFS_NO_BUFFER;
1185         sess_data->nls_cp = (struct nls_table *) nls_cp;
1186 
1187         while (sess_data->func)
1188                 sess_data->func(sess_data);
1189 
1190         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1191                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1192         rc = sess_data->result;
1193 out:
1194         kfree(sess_data);
1195         return rc;
1196 }
1197 
1198 int
1199 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1200 {
1201         struct smb2_logoff_req *req; /* response is also trivial struct */
1202         int rc = 0;
1203         struct TCP_Server_Info *server;
1204         int flags = 0;
1205 
1206         cifs_dbg(FYI, "disconnect session %p\n", ses);
1207 
1208         if (ses && (ses->server))
1209                 server = ses->server;
1210         else
1211                 return -EIO;
1212 
1213         /* no need to send SMB logoff if uid already closed due to reconnect */
1214         if (ses->need_reconnect)
1215                 goto smb2_session_already_dead;
1216 
1217         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1218         if (rc)
1219                 return rc;
1220 
1221          /* since no tcon, smb2_init can not do this, so do here */
1222         req->hdr.sync_hdr.SessionId = ses->Suid;
1223 
1224         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1225                 flags |= CIFS_TRANSFORM_REQ;
1226         else if (server->sign)
1227                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1228 
1229         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1230         cifs_small_buf_release(req);
1231         /*
1232          * No tcon so can't do
1233          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1234          */
1235 
1236 smb2_session_already_dead:
1237         return rc;
1238 }
1239 
1240 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1241 {
1242         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1243 }
1244 
1245 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1246 
1247 /* These are similar values to what Windows uses */
1248 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1249 {
1250         tcon->max_chunks = 256;
1251         tcon->max_bytes_chunk = 1048576;
1252         tcon->max_bytes_copy = 16777216;
1253 }
1254 
1255 int
1256 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1257           struct cifs_tcon *tcon, const struct nls_table *cp)
1258 {
1259         struct smb2_tree_connect_req *req;
1260         struct smb2_tree_connect_rsp *rsp = NULL;
1261         struct kvec iov[2];
1262         struct kvec rsp_iov = { NULL, 0 };
1263         int rc = 0;
1264         int resp_buftype;
1265         int unc_path_len;
1266         __le16 *unc_path = NULL;
1267         int flags = 0;
1268 
1269         cifs_dbg(FYI, "TCON\n");
1270 
1271         if (!(ses->server) || !tree)
1272                 return -EIO;
1273 
1274         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1275         if (unc_path == NULL)
1276                 return -ENOMEM;
1277 
1278         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1279         unc_path_len *= 2;
1280         if (unc_path_len < 2) {
1281                 kfree(unc_path);
1282                 return -EINVAL;
1283         }
1284 
1285         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1286         if (tcon)
1287                 tcon->tid = 0;
1288 
1289         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1290         if (rc) {
1291                 kfree(unc_path);
1292                 return rc;
1293         }
1294 
1295         if (tcon == NULL) {
1296                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1297                         flags |= CIFS_TRANSFORM_REQ;
1298 
1299                 /* since no tcon, smb2_init can not do this, so do here */
1300                 req->hdr.sync_hdr.SessionId = ses->Suid;
1301                 if (ses->server->sign)
1302                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1303         } else if (encryption_required(tcon))
1304                 flags |= CIFS_TRANSFORM_REQ;
1305 
1306         iov[0].iov_base = (char *)req;
1307         /* 4 for rfc1002 length field and 1 for pad */
1308         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1309 
1310         /* Testing shows that buffer offset must be at location of Buffer[0] */
1311         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1312                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1313         req->PathLength = cpu_to_le16(unc_path_len - 2);
1314         iov[1].iov_base = unc_path;
1315         iov[1].iov_len = unc_path_len;
1316 
1317         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1318 
1319         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1320         cifs_small_buf_release(req);
1321         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1322 
1323         if (rc != 0) {
1324                 if (tcon) {
1325                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1326                         tcon->need_reconnect = true;
1327                 }
1328                 goto tcon_error_exit;
1329         }
1330 
1331         if (tcon == NULL) {
1332                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1333                 goto tcon_exit;
1334         }
1335 
1336         switch (rsp->ShareType) {
1337         case SMB2_SHARE_TYPE_DISK:
1338                 cifs_dbg(FYI, "connection to disk share\n");
1339                 break;
1340         case SMB2_SHARE_TYPE_PIPE:
1341                 tcon->ipc = true;
1342                 cifs_dbg(FYI, "connection to pipe share\n");
1343                 break;
1344         case SMB2_SHARE_TYPE_PRINT:
1345                 tcon->ipc = true;
1346                 cifs_dbg(FYI, "connection to printer\n");
1347                 break;
1348         default:
1349                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1350                 rc = -EOPNOTSUPP;
1351                 goto tcon_error_exit;
1352         }
1353 
1354         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1355         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1356         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1357         tcon->tidStatus = CifsGood;
1358         tcon->need_reconnect = false;
1359         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1360         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1361 
1362         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1363             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1364                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1365 
1366         if (tcon->seal &&
1367             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1368                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1369 
1370         init_copy_chunk_defaults(tcon);
1371         if (tcon->ses->server->ops->validate_negotiate)
1372                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1373 tcon_exit:
1374         free_rsp_buf(resp_buftype, rsp);
1375         kfree(unc_path);
1376         return rc;
1377 
1378 tcon_error_exit:
1379         if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1380                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1381         }
1382         goto tcon_exit;
1383 }
1384 
1385 int
1386 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1387 {
1388         struct smb2_tree_disconnect_req *req; /* response is trivial */
1389         int rc = 0;
1390         struct cifs_ses *ses = tcon->ses;
1391         int flags = 0;
1392 
1393         cifs_dbg(FYI, "Tree Disconnect\n");
1394 
1395         if (!ses || !(ses->server))
1396                 return -EIO;
1397 
1398         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1399                 return 0;
1400 
1401         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1402         if (rc)
1403                 return rc;
1404 
1405         if (encryption_required(tcon))
1406                 flags |= CIFS_TRANSFORM_REQ;
1407 
1408         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1409         cifs_small_buf_release(req);
1410         if (rc)
1411                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1412 
1413         return rc;
1414 }
1415 
1416 
1417 static struct create_durable *
1418 create_durable_buf(void)
1419 {
1420         struct create_durable *buf;
1421 
1422         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1423         if (!buf)
1424                 return NULL;
1425 
1426         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1427                                         (struct create_durable, Data));
1428         buf->ccontext.DataLength = cpu_to_le32(16);
1429         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1430                                 (struct create_durable, Name));
1431         buf->ccontext.NameLength = cpu_to_le16(4);
1432         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1433         buf->Name[0] = 'D';
1434         buf->Name[1] = 'H';
1435         buf->Name[2] = 'n';
1436         buf->Name[3] = 'Q';
1437         return buf;
1438 }
1439 
1440 static struct create_durable *
1441 create_reconnect_durable_buf(struct cifs_fid *fid)
1442 {
1443         struct create_durable *buf;
1444 
1445         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1446         if (!buf)
1447                 return NULL;
1448 
1449         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1450                                         (struct create_durable, Data));
1451         buf->ccontext.DataLength = cpu_to_le32(16);
1452         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1453                                 (struct create_durable, Name));
1454         buf->ccontext.NameLength = cpu_to_le16(4);
1455         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1456         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1457         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1458         buf->Name[0] = 'D';
1459         buf->Name[1] = 'H';
1460         buf->Name[2] = 'n';
1461         buf->Name[3] = 'C';
1462         return buf;
1463 }
1464 
1465 static __u8
1466 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1467                   unsigned int *epoch)
1468 {
1469         char *data_offset;
1470         struct create_context *cc;
1471         unsigned int next;
1472         unsigned int remaining;
1473         char *name;
1474 
1475         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1476         remaining = le32_to_cpu(rsp->CreateContextsLength);
1477         cc = (struct create_context *)data_offset;
1478         while (remaining >= sizeof(struct create_context)) {
1479                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1480                 if (le16_to_cpu(cc->NameLength) == 4 &&
1481                     strncmp(name, "RqLs", 4) == 0)
1482                         return server->ops->parse_lease_buf(cc, epoch);
1483 
1484                 next = le32_to_cpu(cc->Next);
1485                 if (!next)
1486                         break;
1487                 remaining -= next;
1488                 cc = (struct create_context *)((char *)cc + next);
1489         }
1490 
1491         return 0;
1492 }
1493 
1494 static int
1495 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1496                   unsigned int *num_iovec, __u8 *oplock)
1497 {
1498         struct smb2_create_req *req = iov[0].iov_base;
1499         unsigned int num = *num_iovec;
1500 
1501         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1502         if (iov[num].iov_base == NULL)
1503                 return -ENOMEM;
1504         iov[num].iov_len = server->vals->create_lease_size;
1505         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1506         if (!req->CreateContextsOffset)
1507                 req->CreateContextsOffset = cpu_to_le32(
1508                                 sizeof(struct smb2_create_req) - 4 +
1509                                 iov[num - 1].iov_len);
1510         le32_add_cpu(&req->CreateContextsLength,
1511                      server->vals->create_lease_size);
1512         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1513         *num_iovec = num + 1;
1514         return 0;
1515 }
1516 
1517 static struct create_durable_v2 *
1518 create_durable_v2_buf(struct cifs_fid *pfid)
1519 {
1520         struct create_durable_v2 *buf;
1521 
1522         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1523         if (!buf)
1524                 return NULL;
1525 
1526         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1527                                         (struct create_durable_v2, dcontext));
1528         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1529         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1530                                 (struct create_durable_v2, Name));
1531         buf->ccontext.NameLength = cpu_to_le16(4);
1532 
1533         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1534         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1535         generate_random_uuid(buf->dcontext.CreateGuid);
1536         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1537 
1538         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1539         buf->Name[0] = 'D';
1540         buf->Name[1] = 'H';
1541         buf->Name[2] = '2';
1542         buf->Name[3] = 'Q';
1543         return buf;
1544 }
1545 
1546 static struct create_durable_handle_reconnect_v2 *
1547 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1548 {
1549         struct create_durable_handle_reconnect_v2 *buf;
1550 
1551         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1552                         GFP_KERNEL);
1553         if (!buf)
1554                 return NULL;
1555 
1556         buf->ccontext.DataOffset =
1557                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1558                                      dcontext));
1559         buf->ccontext.DataLength =
1560                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1561         buf->ccontext.NameOffset =
1562                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1563                             Name));
1564         buf->ccontext.NameLength = cpu_to_le16(4);
1565 
1566         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1567         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1568         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1569         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1570 
1571         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1572         buf->Name[0] = 'D';
1573         buf->Name[1] = 'H';
1574         buf->Name[2] = '2';
1575         buf->Name[3] = 'C';
1576         return buf;
1577 }
1578 
1579 static int
1580 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1581                     struct cifs_open_parms *oparms)
1582 {
1583         struct smb2_create_req *req = iov[0].iov_base;
1584         unsigned int num = *num_iovec;
1585 
1586         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1587         if (iov[num].iov_base == NULL)
1588                 return -ENOMEM;
1589         iov[num].iov_len = sizeof(struct create_durable_v2);
1590         if (!req->CreateContextsOffset)
1591                 req->CreateContextsOffset =
1592                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1593                                                                 iov[1].iov_len);
1594         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1595         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1596         *num_iovec = num + 1;
1597         return 0;
1598 }
1599 
1600 static int
1601 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1602                     struct cifs_open_parms *oparms)
1603 {
1604         struct smb2_create_req *req = iov[0].iov_base;
1605         unsigned int num = *num_iovec;
1606 
1607         /* indicate that we don't need to relock the file */
1608         oparms->reconnect = false;
1609 
1610         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1611         if (iov[num].iov_base == NULL)
1612                 return -ENOMEM;
1613         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1614         if (!req->CreateContextsOffset)
1615                 req->CreateContextsOffset =
1616                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1617                                                                 iov[1].iov_len);
1618         le32_add_cpu(&req->CreateContextsLength,
1619                         sizeof(struct create_durable_handle_reconnect_v2));
1620         inc_rfc1001_len(&req->hdr,
1621                         sizeof(struct create_durable_handle_reconnect_v2));
1622         *num_iovec = num + 1;
1623         return 0;
1624 }
1625 
1626 static int
1627 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1628                     struct cifs_open_parms *oparms, bool use_persistent)
1629 {
1630         struct smb2_create_req *req = iov[0].iov_base;
1631         unsigned int num = *num_iovec;
1632 
1633         if (use_persistent) {
1634                 if (oparms->reconnect)
1635                         return add_durable_reconnect_v2_context(iov, num_iovec,
1636                                                                 oparms);
1637                 else
1638                         return add_durable_v2_context(iov, num_iovec, oparms);
1639         }
1640 
1641         if (oparms->reconnect) {
1642                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1643                 /* indicate that we don't need to relock the file */
1644                 oparms->reconnect = false;
1645         } else
1646                 iov[num].iov_base = create_durable_buf();
1647         if (iov[num].iov_base == NULL)
1648                 return -ENOMEM;
1649         iov[num].iov_len = sizeof(struct create_durable);
1650         if (!req->CreateContextsOffset)
1651                 req->CreateContextsOffset =
1652                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1653                                                                 iov[1].iov_len);
1654         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1655         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1656         *num_iovec = num + 1;
1657         return 0;
1658 }
1659 
1660 static int
1661 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1662                             const char *treename, const __le16 *path)
1663 {
1664         int treename_len, path_len;
1665         struct nls_table *cp;
1666         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1667 
1668         /*
1669          * skip leading "\\"
1670          */
1671         treename_len = strlen(treename);
1672         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1673                 return -EINVAL;
1674 
1675         treename += 2;
1676         treename_len -= 2;
1677 
1678         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1679 
1680         /*
1681          * make room for one path separator between the treename and
1682          * path
1683          */
1684         *out_len = treename_len + 1 + path_len;
1685 
1686         /*
1687          * final path needs to be null-terminated UTF16 with a
1688          * size aligned to 8
1689          */
1690 
1691         *out_size = roundup((*out_len+1)*2, 8);
1692         *out_path = kzalloc(*out_size, GFP_KERNEL);
1693         if (!*out_path)
1694                 return -ENOMEM;
1695 
1696         cp = load_nls_default();
1697         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1698         UniStrcat(*out_path, sep);
1699         UniStrcat(*out_path, path);
1700         unload_nls(cp);
1701 
1702         return 0;
1703 }
1704 
1705 int
1706 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1707           __u8 *oplock, struct smb2_file_all_info *buf,
1708           struct smb2_err_rsp **err_buf)
1709 {
1710         struct smb2_create_req *req;
1711         struct smb2_create_rsp *rsp;
1712         struct TCP_Server_Info *server;
1713         struct cifs_tcon *tcon = oparms->tcon;
1714         struct cifs_ses *ses = tcon->ses;
1715         struct kvec iov[4];
1716         struct kvec rsp_iov = {NULL, 0};
1717         int resp_buftype;
1718         int uni_path_len;
1719         __le16 *copy_path = NULL;
1720         int copy_size;
1721         int rc = 0;
1722         unsigned int n_iov = 2;
1723         __u32 file_attributes = 0;
1724         char *dhc_buf = NULL, *lc_buf = NULL;
1725         int flags = 0;
1726 
1727         cifs_dbg(FYI, "create/open\n");
1728 
1729         if (ses && (ses->server))
1730                 server = ses->server;
1731         else
1732                 return -EIO;
1733 
1734         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1735         if (rc)
1736                 return rc;
1737 
1738         if (encryption_required(tcon))
1739                 flags |= CIFS_TRANSFORM_REQ;
1740 
1741         if (oparms->create_options & CREATE_OPTION_READONLY)
1742                 file_attributes |= ATTR_READONLY;
1743         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1744                 file_attributes |= ATTR_SYSTEM;
1745 
1746         req->ImpersonationLevel = IL_IMPERSONATION;
1747         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1748         /* File attributes ignored on open (used in create though) */
1749         req->FileAttributes = cpu_to_le32(file_attributes);
1750         req->ShareAccess = FILE_SHARE_ALL_LE;
1751         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1752         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1753 
1754         iov[0].iov_base = (char *)req;
1755         /* 4 for rfc1002 length field */
1756         iov[0].iov_len = get_rfc1002_length(req) + 4;
1757         /* -1 since last byte is buf[0] which is sent below (path) */
1758         iov[0].iov_len--;
1759 
1760         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1761 
1762         /* [MS-SMB2] 2.2.13 NameOffset:
1763          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1764          * the SMB2 header, the file name includes a prefix that will
1765          * be processed during DFS name normalization as specified in
1766          * section 3.3.5.9. Otherwise, the file name is relative to
1767          * the share that is identified by the TreeId in the SMB2
1768          * header.
1769          */
1770         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1771                 int name_len;
1772 
1773                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1774                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1775                                                  &name_len,
1776                                                  tcon->treeName, path);
1777                 if (rc)
1778                         return rc;
1779                 req->NameLength = cpu_to_le16(name_len * 2);
1780                 uni_path_len = copy_size;
1781                 path = copy_path;
1782         } else {
1783                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1784                 /* MUST set path len (NameLength) to 0 opening root of share */
1785                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1786                 if (uni_path_len % 8 != 0) {
1787                         copy_size = roundup(uni_path_len, 8);
1788                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1789                         if (!copy_path)
1790                                 return -ENOMEM;
1791                         memcpy((char *)copy_path, (const char *)path,
1792                                uni_path_len);
1793                         uni_path_len = copy_size;
1794                         path = copy_path;
1795                 }
1796         }
1797 
1798         iov[1].iov_len = uni_path_len;
1799         iov[1].iov_base = path;
1800         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1801         inc_rfc1001_len(req, uni_path_len - 1);
1802 
1803         if (!server->oplocks)
1804                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1805 
1806         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1807             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1808                 req->RequestedOplockLevel = *oplock;
1809         else {
1810                 rc = add_lease_context(server, iov, &n_iov, oplock);
1811                 if (rc) {
1812                         cifs_small_buf_release(req);
1813                         kfree(copy_path);
1814                         return rc;
1815                 }
1816                 lc_buf = iov[n_iov-1].iov_base;
1817         }
1818 
1819         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1820                 /* need to set Next field of lease context if we request it */
1821                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1822                         struct create_context *ccontext =
1823                             (struct create_context *)iov[n_iov-1].iov_base;
1824                         ccontext->Next =
1825                                 cpu_to_le32(server->vals->create_lease_size);
1826                 }
1827 
1828                 rc = add_durable_context(iov, &n_iov, oparms,
1829                                         tcon->use_persistent);
1830                 if (rc) {
1831                         cifs_small_buf_release(req);
1832                         kfree(copy_path);
1833                         kfree(lc_buf);
1834                         return rc;
1835                 }
1836                 dhc_buf = iov[n_iov-1].iov_base;
1837         }
1838 
1839         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1840         cifs_small_buf_release(req);
1841         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1842 
1843         if (rc != 0) {
1844                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1845                 if (err_buf && rsp)
1846                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1847                                            GFP_KERNEL);
1848                 goto creat_exit;
1849         }
1850 
1851         oparms->fid->persistent_fid = rsp->PersistentFileId;
1852         oparms->fid->volatile_fid = rsp->VolatileFileId;
1853 
1854         if (buf) {
1855                 memcpy(buf, &rsp->CreationTime, 32);
1856                 buf->AllocationSize = rsp->AllocationSize;
1857                 buf->EndOfFile = rsp->EndofFile;
1858                 buf->Attributes = rsp->FileAttributes;
1859                 buf->NumberOfLinks = cpu_to_le32(1);
1860                 buf->DeletePending = 0;
1861         }
1862 
1863         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1864                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1865         else
1866                 *oplock = rsp->OplockLevel;
1867 creat_exit:
1868         kfree(copy_path);
1869         kfree(lc_buf);
1870         kfree(dhc_buf);
1871         free_rsp_buf(resp_buftype, rsp);
1872         return rc;
1873 }
1874 
1875 /*
1876  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1877  */
1878 int
1879 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1880            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1881            char *in_data, u32 indatalen,
1882            char **out_data, u32 *plen /* returned data len */)
1883 {
1884         struct smb2_ioctl_req *req;
1885         struct smb2_ioctl_rsp *rsp;
1886         struct smb2_sync_hdr *shdr;
1887         struct cifs_ses *ses;
1888         struct kvec iov[2];
1889         struct kvec rsp_iov;
1890         int resp_buftype;
1891         int n_iov;
1892         int rc = 0;
1893         int flags = 0;
1894 
1895         cifs_dbg(FYI, "SMB2 IOCTL\n");
1896 
1897         if (out_data != NULL)
1898                 *out_data = NULL;
1899 
1900         /* zero out returned data len, in case of error */
1901         if (plen)
1902                 *plen = 0;
1903 
1904         if (tcon)
1905                 ses = tcon->ses;
1906         else
1907                 return -EIO;
1908 
1909         if (!ses || !(ses->server))
1910                 return -EIO;
1911 
1912         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1913         if (rc)
1914                 return rc;
1915 
1916         if (use_ipc) {
1917                 if (ses->ipc_tid == 0) {
1918                         cifs_small_buf_release(req);
1919                         return -ENOTCONN;
1920                 }
1921 
1922                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1923                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1924                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1925         }
1926         if (encryption_required(tcon))
1927                 flags |= CIFS_TRANSFORM_REQ;
1928 
1929         req->CtlCode = cpu_to_le32(opcode);
1930         req->PersistentFileId = persistent_fid;
1931         req->VolatileFileId = volatile_fid;
1932 
1933         if (indatalen) {
1934                 req->InputCount = cpu_to_le32(indatalen);
1935                 /* do not set InputOffset if no input data */
1936                 req->InputOffset =
1937                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1938                 iov[1].iov_base = in_data;
1939                 iov[1].iov_len = indatalen;
1940                 n_iov = 2;
1941         } else
1942                 n_iov = 1;
1943 
1944         req->OutputOffset = 0;
1945         req->OutputCount = 0; /* MBZ */
1946 
1947         /*
1948          * Could increase MaxOutputResponse, but that would require more
1949          * than one credit. Windows typically sets this smaller, but for some
1950          * ioctls it may be useful to allow server to send more. No point
1951          * limiting what the server can send as long as fits in one credit
1952          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1953          * (by default, note that it can be overridden to make max larger)
1954          * in responses (except for read responses which can be bigger.
1955          * We may want to bump this limit up
1956          */
1957         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1958 
1959         if (is_fsctl)
1960                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1961         else
1962                 req->Flags = 0;
1963 
1964         iov[0].iov_base = (char *)req;
1965 
1966         /*
1967          * If no input data, the size of ioctl struct in
1968          * protocol spec still includes a 1 byte data buffer,
1969          * but if input data passed to ioctl, we do not
1970          * want to double count this, so we do not send
1971          * the dummy one byte of data in iovec[0] if sending
1972          * input data (in iovec[1]). We also must add 4 bytes
1973          * in first iovec to allow for rfc1002 length field.
1974          */
1975 
1976         if (indatalen) {
1977                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1978                 inc_rfc1001_len(req, indatalen - 1);
1979         } else
1980                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1981 
1982         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
1983         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
1984                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1985 
1986         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1987         cifs_small_buf_release(req);
1988         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1989 
1990         if ((rc != 0) && (rc != -EINVAL)) {
1991                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1992                 goto ioctl_exit;
1993         } else if (rc == -EINVAL) {
1994                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1995                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1996                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1997                         goto ioctl_exit;
1998                 }
1999         }
2000 
2001         /* check if caller wants to look at return data or just return rc */
2002         if ((plen == NULL) || (out_data == NULL))
2003                 goto ioctl_exit;
2004 
2005         *plen = le32_to_cpu(rsp->OutputCount);
2006 
2007         /* We check for obvious errors in the output buffer length and offset */
2008         if (*plen == 0)
2009                 goto ioctl_exit; /* server returned no data */
2010         else if (*plen > 0xFF00) {
2011                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2012                 *plen = 0;
2013                 rc = -EIO;
2014                 goto ioctl_exit;
2015         }
2016 
2017         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
2018                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2019                         le32_to_cpu(rsp->OutputOffset));
2020                 *plen = 0;
2021                 rc = -EIO;
2022                 goto ioctl_exit;
2023         }
2024 
2025         *out_data = kmalloc(*plen, GFP_KERNEL);
2026         if (*out_data == NULL) {
2027                 rc = -ENOMEM;
2028                 goto ioctl_exit;
2029         }
2030 
2031         shdr = get_sync_hdr(rsp);
2032         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2033 ioctl_exit:
2034         free_rsp_buf(resp_buftype, rsp);
2035         return rc;
2036 }
2037 
2038 /*
2039  *   Individual callers to ioctl worker function follow
2040  */
2041 
2042 int
2043 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2044                      u64 persistent_fid, u64 volatile_fid)
2045 {
2046         int rc;
2047         struct  compress_ioctl fsctl_input;
2048         char *ret_data = NULL;
2049 
2050         fsctl_input.CompressionState =
2051                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2052 
2053         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2054                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2055                         false /* use_ipc */,
2056                         (char *)&fsctl_input /* data input */,
2057                         2 /* in data len */, &ret_data /* out data */, NULL);
2058 
2059         cifs_dbg(FYI, "set compression rc %d\n", rc);
2060 
2061         return rc;
2062 }
2063 
2064 int
2065 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2066            u64 persistent_fid, u64 volatile_fid)
2067 {
2068         struct smb2_close_req *req;
2069         struct smb2_close_rsp *rsp;
2070         struct cifs_ses *ses = tcon->ses;
2071         struct kvec iov[1];
2072         struct kvec rsp_iov;
2073         int resp_buftype;
2074         int rc = 0;
2075         int flags = 0;
2076 
2077         cifs_dbg(FYI, "Close\n");
2078 
2079         if (!ses || !(ses->server))
2080                 return -EIO;
2081 
2082         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
2083         if (rc)
2084                 return rc;
2085 
2086         if (encryption_required(tcon))
2087                 flags |= CIFS_TRANSFORM_REQ;
2088 
2089         req->PersistentFileId = persistent_fid;
2090         req->VolatileFileId = volatile_fid;
2091 
2092         iov[0].iov_base = (char *)req;
2093         /* 4 for rfc1002 length field */
2094         iov[0].iov_len = get_rfc1002_length(req) + 4;
2095 
2096         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2097         cifs_small_buf_release(req);
2098         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2099 
2100         if (rc != 0) {
2101                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2102                 goto close_exit;
2103         }
2104 
2105         /* BB FIXME - decode close response, update inode for caching */
2106 
2107 close_exit:
2108         free_rsp_buf(resp_buftype, rsp);
2109         return rc;
2110 }
2111 
2112 static int
2113 validate_buf(unsigned int offset, unsigned int buffer_length,
2114              struct smb2_hdr *hdr, unsigned int min_buf_size)
2115 
2116 {
2117         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2118         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2119         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2120         char *end_of_buf = begin_of_buf + buffer_length;
2121 
2122 
2123         if (buffer_length < min_buf_size) {
2124                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2125                          buffer_length, min_buf_size);
2126                 return -EINVAL;
2127         }
2128 
2129         /* check if beyond RFC1001 maximum length */
2130         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2131                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2132                          buffer_length, smb_len);
2133                 return -EINVAL;
2134         }
2135 
2136         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2137                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2138                 return -EINVAL;
2139         }
2140 
2141         return 0;
2142 }
2143 
2144 /*
2145  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2146  * Caller must free buffer.
2147  */
2148 static int
2149 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2150                       struct smb2_hdr *hdr, unsigned int minbufsize,
2151                       char *data)
2152 
2153 {
2154         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2155         int rc;
2156 
2157         if (!data)
2158                 return -EINVAL;
2159 
2160         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2161         if (rc)
2162                 return rc;
2163 
2164         memcpy(data, begin_of_buf, buffer_length);
2165 
2166         return 0;
2167 }
2168 
2169 static int
2170 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2171            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2172            u32 additional_info, size_t output_len, size_t min_len, void **data,
2173                 u32 *dlen)
2174 {
2175         struct smb2_query_info_req *req;
2176         struct smb2_query_info_rsp *rsp = NULL;
2177         struct kvec iov[2];
2178         struct kvec rsp_iov;
2179         int rc = 0;
2180         int resp_buftype;
2181         struct cifs_ses *ses = tcon->ses;
2182         int flags = 0;
2183 
2184         cifs_dbg(FYI, "Query Info\n");
2185 
2186         if (!ses || !(ses->server))
2187                 return -EIO;
2188 
2189         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2190         if (rc)
2191                 return rc;
2192 
2193         if (encryption_required(tcon))
2194                 flags |= CIFS_TRANSFORM_REQ;
2195 
2196         req->InfoType = info_type;
2197         req->FileInfoClass = info_class;
2198         req->PersistentFileId = persistent_fid;
2199         req->VolatileFileId = volatile_fid;
2200         req->AdditionalInformation = cpu_to_le32(additional_info);
2201 
2202         /*
2203          * We do not use the input buffer (do not send extra byte)
2204          */
2205         req->InputBufferOffset = 0;
2206         inc_rfc1001_len(req, -1);
2207 
2208         req->OutputBufferLength = cpu_to_le32(output_len);
2209 
2210         iov[0].iov_base = (char *)req;
2211         /* 4 for rfc1002 length field */
2212         iov[0].iov_len = get_rfc1002_length(req) + 4;
2213 
2214         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2215         cifs_small_buf_release(req);
2216         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2217 
2218         if (rc) {
2219                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2220                 goto qinf_exit;
2221         }
2222 
2223         if (dlen) {
2224                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2225                 if (!*data) {
2226                         *data = kmalloc(*dlen, GFP_KERNEL);
2227                         if (!*data) {
2228                                 cifs_dbg(VFS,
2229                                         "Error %d allocating memory for acl\n",
2230                                         rc);
2231                                 *dlen = 0;
2232                                 goto qinf_exit;
2233                         }
2234                 }
2235         }
2236 
2237         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2238                                    le32_to_cpu(rsp->OutputBufferLength),
2239                                    &rsp->hdr, min_len, *data);
2240 
2241 qinf_exit:
2242         free_rsp_buf(resp_buftype, rsp);
2243         return rc;
2244 }
2245 
2246 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2247                    u64 persistent_fid, u64 volatile_fid,
2248                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2249 {
2250         return query_info(xid, tcon, persistent_fid, volatile_fid,
2251                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2252                           ea_buf_size,
2253                           sizeof(struct smb2_file_full_ea_info),
2254                           (void **)&data,
2255                           NULL);
2256 }
2257 
2258 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2259         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2260 {
2261         return query_info(xid, tcon, persistent_fid, volatile_fid,
2262                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2263                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2264                           sizeof(struct smb2_file_all_info), (void **)&data,
2265                           NULL);
2266 }
2267 
2268 int
2269 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2270                 u64 persistent_fid, u64 volatile_fid,
2271                 void **data, u32 *plen)
2272 {
2273         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2274         *plen = 0;
2275 
2276         return query_info(xid, tcon, persistent_fid, volatile_fid,
2277                           0, SMB2_O_INFO_SECURITY, additional_info,
2278                           SMB2_MAX_BUFFER_SIZE,
2279                           sizeof(struct smb2_file_all_info), data, plen);
2280 }
2281 
2282 int
2283 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2284                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2285 {
2286         return query_info(xid, tcon, persistent_fid, volatile_fid,
2287                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2288                           sizeof(struct smb2_file_internal_info),
2289                           sizeof(struct smb2_file_internal_info),
2290                           (void **)&uniqueid, NULL);
2291 }
2292 
2293 /*
2294  * This is a no-op for now. We're not really interested in the reply, but
2295  * rather in the fact that the server sent one and that server->lstrp
2296  * gets updated.
2297  *
2298  * FIXME: maybe we should consider checking that the reply matches request?
2299  */
2300 static void
2301 smb2_echo_callback(struct mid_q_entry *mid)
2302 {
2303         struct TCP_Server_Info *server = mid->callback_data;
2304         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2305         unsigned int credits_received = 1;
2306 
2307         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2308                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2309 
2310         DeleteMidQEntry(mid);
2311         add_credits(server, credits_received, CIFS_ECHO_OP);
2312 }
2313 
2314 void smb2_reconnect_server(struct work_struct *work)
2315 {
2316         struct TCP_Server_Info *server = container_of(work,
2317                                         struct TCP_Server_Info, reconnect.work);
2318         struct cifs_ses *ses;
2319         struct cifs_tcon *tcon, *tcon2;
2320         struct list_head tmp_list;
2321         int tcon_exist = false;
2322         int rc;
2323         int resched = false;
2324 
2325 
2326         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2327         mutex_lock(&server->reconnect_mutex);
2328 
2329         INIT_LIST_HEAD(&tmp_list);
2330         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2331 
2332         spin_lock(&cifs_tcp_ses_lock);
2333         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2334                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2335                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2336                                 tcon->tc_count++;
2337                                 list_add_tail(&tcon->rlist, &tmp_list);
2338                                 tcon_exist = true;
2339                         }
2340                 }
2341         }
2342         /*
2343          * Get the reference to server struct to be sure that the last call of
2344          * cifs_put_tcon() in the loop below won't release the server pointer.
2345          */
2346         if (tcon_exist)
2347                 server->srv_count++;
2348 
2349         spin_unlock(&cifs_tcp_ses_lock);
2350 
2351         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2352                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2353                 if (!rc)
2354                         cifs_reopen_persistent_handles(tcon);
2355                 else
2356                         resched = true;
2357                 list_del_init(&tcon->rlist);
2358                 cifs_put_tcon(tcon);
2359         }
2360 
2361         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2362         if (resched)
2363                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2364         mutex_unlock(&server->reconnect_mutex);
2365 
2366         /* now we can safely release srv struct */
2367         if (tcon_exist)
2368                 cifs_put_tcp_session(server, 1);
2369 }
2370 
2371 int
2372 SMB2_echo(struct TCP_Server_Info *server)
2373 {
2374         struct smb2_echo_req *req;
2375         int rc = 0;
2376         struct kvec iov[2];
2377         struct smb_rqst rqst = { .rq_iov = iov,
2378                                  .rq_nvec = 2 };
2379 
2380         cifs_dbg(FYI, "In echo request\n");
2381 
2382         if (server->tcpStatus == CifsNeedNegotiate) {
2383                 /* No need to send echo on newly established connections */
2384                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2385                 return rc;
2386         }
2387 
2388         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2389         if (rc)
2390                 return rc;
2391 
2392         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2393 
2394         /* 4 for rfc1002 length field */
2395         iov[0].iov_len = 4;
2396         iov[0].iov_base = (char *)req;
2397         iov[1].iov_len = get_rfc1002_length(req);
2398         iov[1].iov_base = (char *)req + 4;
2399 
2400         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2401                              server, CIFS_ECHO_OP);
2402         if (rc)
2403                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2404 
2405         cifs_small_buf_release(req);
2406         return rc;
2407 }
2408 
2409 int
2410 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2411            u64 volatile_fid)
2412 {
2413         struct smb2_flush_req *req;
2414         struct cifs_ses *ses = tcon->ses;
2415         struct kvec iov[1];
2416         struct kvec rsp_iov;
2417         int resp_buftype;
2418         int rc = 0;
2419         int flags = 0;
2420 
2421         cifs_dbg(FYI, "Flush\n");
2422 
2423         if (!ses || !(ses->server))
2424                 return -EIO;
2425 
2426         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2427         if (rc)
2428                 return rc;
2429 
2430         if (encryption_required(tcon))
2431                 flags |= CIFS_TRANSFORM_REQ;
2432 
2433         req->PersistentFileId = persistent_fid;
2434         req->VolatileFileId = volatile_fid;
2435 
2436         iov[0].iov_base = (char *)req;
2437         /* 4 for rfc1002 length field */
2438         iov[0].iov_len = get_rfc1002_length(req) + 4;
2439 
2440         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2441         cifs_small_buf_release(req);
2442 
2443         if (rc != 0)
2444                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2445 
2446         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2447         return rc;
2448 }
2449 
2450 /*
2451  * To form a chain of read requests, any read requests after the first should
2452  * have the end_of_chain boolean set to true.
2453  */
2454 static int
2455 smb2_new_read_req(void **buf, unsigned int *total_len,
2456                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2457                   int request_type)
2458 {
2459         int rc = -EACCES;
2460         struct smb2_read_plain_req *req = NULL;
2461         struct smb2_sync_hdr *shdr;
2462 
2463         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2464                                  total_len);
2465         if (rc)
2466                 return rc;
2467         if (io_parms->tcon->ses->server == NULL)
2468                 return -ECONNABORTED;
2469 
2470         shdr = &req->sync_hdr;
2471         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2472 
2473         req->PersistentFileId = io_parms->persistent_fid;
2474         req->VolatileFileId = io_parms->volatile_fid;
2475         req->ReadChannelInfoOffset = 0; /* reserved */
2476         req->ReadChannelInfoLength = 0; /* reserved */
2477         req->Channel = 0; /* reserved */
2478         req->MinimumCount = 0;
2479         req->Length = cpu_to_le32(io_parms->length);
2480         req->Offset = cpu_to_le64(io_parms->offset);
2481 
2482         if (request_type & CHAINED_REQUEST) {
2483                 if (!(request_type & END_OF_CHAIN)) {
2484                         /* next 8-byte aligned request */
2485                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2486                         shdr->NextCommand = cpu_to_le32(*total_len);
2487                 } else /* END_OF_CHAIN */
2488                         shdr->NextCommand = 0;
2489                 if (request_type & RELATED_REQUEST) {
2490                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2491                         /*
2492                          * Related requests use info from previous read request
2493                          * in chain.
2494                          */
2495                         shdr->SessionId = 0xFFFFFFFF;
2496                         shdr->TreeId = 0xFFFFFFFF;
2497                         req->PersistentFileId = 0xFFFFFFFF;
2498                         req->VolatileFileId = 0xFFFFFFFF;
2499                 }
2500         }
2501         if (remaining_bytes > io_parms->length)
2502                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2503         else
2504                 req->RemainingBytes = 0;
2505 
2506         *buf = req;
2507         return rc;
2508 }
2509 
2510 static void
2511 smb2_readv_callback(struct mid_q_entry *mid)
2512 {
2513         struct cifs_readdata *rdata = mid->callback_data;
2514         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2515         struct TCP_Server_Info *server = tcon->ses->server;
2516         struct smb2_sync_hdr *shdr =
2517                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2518         unsigned int credits_received = 1;
2519         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2520                                  .rq_nvec = 2,
2521                                  .rq_pages = rdata->pages,
2522                                  .rq_npages = rdata->nr_pages,
2523                                  .rq_pagesz = rdata->pagesz,
2524                                  .rq_tailsz = rdata->tailsz };
2525 
2526         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2527                  __func__, mid->mid, mid->mid_state, rdata->result,
2528                  rdata->bytes);
2529 
2530         switch (mid->mid_state) {
2531         case MID_RESPONSE_RECEIVED:
2532                 credits_received = le16_to_cpu(shdr->CreditRequest);
2533                 /* result already set, check signature */
2534                 if (server->sign && !mid->decrypted) {
2535                         int rc;
2536 
2537                         rc = smb2_verify_signature(&rqst, server);
2538                         if (rc)
2539                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2540                                          rc);
2541                 }
2542                 /* FIXME: should this be counted toward the initiating task? */
2543                 task_io_account_read(rdata->got_bytes);
2544                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2545                 break;
2546         case MID_REQUEST_SUBMITTED:
2547         case MID_RETRY_NEEDED:
2548                 rdata->result = -EAGAIN;
2549                 if (server->sign && rdata->got_bytes)
2550                         /* reset bytes number since we can not check a sign */
2551                         rdata->got_bytes = 0;
2552                 /* FIXME: should this be counted toward the initiating task? */
2553                 task_io_account_read(rdata->got_bytes);
2554                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2555                 break;
2556         default:
2557                 if (rdata->result != -ENODATA)
2558                         rdata->result = -EIO;
2559         }
2560 
2561         if (rdata->result)
2562                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2563 
2564         queue_work(cifsiod_wq, &rdata->work);
2565         DeleteMidQEntry(mid);
2566         add_credits(server, credits_received, 0);
2567 }
2568 
2569 /* smb2_async_readv - send an async read, and set up mid to handle result */
2570 int
2571 smb2_async_readv(struct cifs_readdata *rdata)
2572 {
2573         int rc, flags = 0;
2574         char *buf;
2575         struct smb2_sync_hdr *shdr;
2576         struct cifs_io_parms io_parms;
2577         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2578                                  .rq_nvec = 2 };
2579         struct TCP_Server_Info *server;
2580         unsigned int total_len;
2581         __be32 req_len;
2582 
2583         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2584                  __func__, rdata->offset, rdata->bytes);
2585 
2586         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2587         io_parms.offset = rdata->offset;
2588         io_parms.length = rdata->bytes;
2589         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2590         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2591         io_parms.pid = rdata->pid;
2592 
2593         server = io_parms.tcon->ses->server;
2594 
2595         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2596         if (rc) {
2597                 if (rc == -EAGAIN && rdata->credits) {
2598                         /* credits was reset by reconnect */
2599                         rdata->credits = 0;
2600                         /* reduce in_flight value since we won't send the req */
2601                         spin_lock(&server->req_lock);
2602                         server->in_flight--;
2603                         spin_unlock(&server->req_lock);
2604                 }
2605                 return rc;
2606         }
2607 
2608         if (encryption_required(io_parms.tcon))
2609                 flags |= CIFS_TRANSFORM_REQ;
2610 
2611         req_len = cpu_to_be32(total_len);
2612 
2613         rdata->iov[0].iov_base = &req_len;
2614         rdata->iov[0].iov_len = sizeof(__be32);
2615         rdata->iov[1].iov_base = buf;
2616         rdata->iov[1].iov_len = total_len;
2617 
2618         shdr = (struct smb2_sync_hdr *)buf;
2619 
2620         if (rdata->credits) {
2621                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2622                                                 SMB2_MAX_BUFFER_SIZE));
2623                 shdr->CreditRequest = shdr->CreditCharge;
2624                 spin_lock(&server->req_lock);
2625                 server->credits += rdata->credits -
2626                                                 le16_to_cpu(shdr->CreditCharge);
2627                 spin_unlock(&server->req_lock);
2628                 wake_up(&server->request_q);
2629                 flags |= CIFS_HAS_CREDITS;
2630         }
2631 
2632         kref_get(&rdata->refcount);
2633         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2634                              cifs_readv_receive, smb2_readv_callback,
2635                              smb3_handle_read_data, rdata, flags);
2636         if (rc) {
2637                 kref_put(&rdata->refcount, cifs_readdata_release);
2638                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2639         }
2640 
2641         cifs_small_buf_release(buf);
2642         return rc;
2643 }
2644 
2645 int
2646 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2647           unsigned int *nbytes, char **buf, int *buf_type)
2648 {
2649         int resp_buftype, rc = -EACCES;
2650         struct smb2_read_plain_req *req = NULL;
2651         struct smb2_read_rsp *rsp = NULL;
2652         struct smb2_sync_hdr *shdr;
2653         struct kvec iov[2];
2654         struct kvec rsp_iov;
2655         unsigned int total_len;
2656         __be32 req_len;
2657         struct smb_rqst rqst = { .rq_iov = iov,
2658                                  .rq_nvec = 2 };
2659         int flags = CIFS_LOG_ERROR;
2660         struct cifs_ses *ses = io_parms->tcon->ses;
2661 
2662         *nbytes = 0;
2663         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2664         if (rc)
2665                 return rc;
2666 
2667         if (encryption_required(io_parms->tcon))
2668                 flags |= CIFS_TRANSFORM_REQ;
2669 
2670         req_len = cpu_to_be32(total_len);
2671 
2672         iov[0].iov_base = &req_len;
2673         iov[0].iov_len = sizeof(__be32);
2674         iov[1].iov_base = req;
2675         iov[1].iov_len = total_len;
2676 
2677         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2678         cifs_small_buf_release(req);
2679 
2680         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2681         shdr = get_sync_hdr(rsp);
2682 
2683         if (shdr->Status == STATUS_END_OF_FILE) {
2684                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2685                 return 0;
2686         }
2687 
2688         if (rc) {
2689                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2690                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2691         } else {
2692                 *nbytes = le32_to_cpu(rsp->DataLength);
2693                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2694                     (*nbytes > io_parms->length)) {
2695                         cifs_dbg(FYI, "bad length %d for count %d\n",
2696                                  *nbytes, io_parms->length);
2697                         rc = -EIO;
2698                         *nbytes = 0;
2699                 }
2700         }
2701 
2702         if (*buf) {
2703                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2704                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2705         } else if (resp_buftype != CIFS_NO_BUFFER) {
2706                 *buf = rsp_iov.iov_base;
2707                 if (resp_buftype == CIFS_SMALL_BUFFER)
2708                         *buf_type = CIFS_SMALL_BUFFER;
2709                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2710                         *buf_type = CIFS_LARGE_BUFFER;
2711         }
2712         return rc;
2713 }
2714 
2715 /*
2716  * Check the mid_state and signature on received buffer (if any), and queue the
2717  * workqueue completion task.
2718  */
2719 static void
2720 smb2_writev_callback(struct mid_q_entry *mid)
2721 {
2722         struct cifs_writedata *wdata = mid->callback_data;
2723         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2724         unsigned int written;
2725         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2726         unsigned int credits_received = 1;
2727 
2728         switch (mid->mid_state) {
2729         case MID_RESPONSE_RECEIVED:
2730                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2731                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2732                 if (wdata->result != 0)
2733                         break;
2734 
2735                 written = le32_to_cpu(rsp->DataLength);
2736                 /*
2737                  * Mask off high 16 bits when bytes written as returned
2738                  * by the server is greater than bytes requested by the
2739                  * client. OS/2 servers are known to set incorrect
2740                  * CountHigh values.
2741                  */
2742                 if (written > wdata->bytes)
2743                         written &= 0xFFFF;
2744 
2745                 if (written < wdata->bytes)
2746                         wdata->result = -ENOSPC;
2747                 else
2748                         wdata->bytes = written;
2749                 break;
2750         case MID_REQUEST_SUBMITTED:
2751         case MID_RETRY_NEEDED:
2752                 wdata->result = -EAGAIN;
2753                 break;
2754         default:
2755                 wdata->result = -EIO;
2756                 break;
2757         }
2758 
2759         if (wdata->result)
2760                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2761 
2762         queue_work(cifsiod_wq, &wdata->work);
2763         DeleteMidQEntry(mid);
2764         add_credits(tcon->ses->server, credits_received, 0);
2765 }
2766 
2767 /* smb2_async_writev - send an async write, and set up mid to handle result */
2768 int
2769 smb2_async_writev(struct cifs_writedata *wdata,
2770                   void (*release)(struct kref *kref))
2771 {
2772         int rc = -EACCES, flags = 0;
2773         struct smb2_write_req *req = NULL;
2774         struct smb2_sync_hdr *shdr;
2775         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2776         struct TCP_Server_Info *server = tcon->ses->server;
2777         struct kvec iov[2];
2778         struct smb_rqst rqst = { };
2779 
2780         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2781         if (rc) {
2782                 if (rc == -EAGAIN && wdata->credits) {
2783                         /* credits was reset by reconnect */
2784                         wdata->credits = 0;
2785                         /* reduce in_flight value since we won't send the req */
2786                         spin_lock(&server->req_lock);
2787                         server->in_flight--;
2788                         spin_unlock(&server->req_lock);
2789                 }
2790                 goto async_writev_out;
2791         }
2792 
2793         if (encryption_required(tcon))
2794                 flags |= CIFS_TRANSFORM_REQ;
2795 
2796         shdr = get_sync_hdr(req);
2797         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2798 
2799         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2800         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2801         req->WriteChannelInfoOffset = 0;
2802         req->WriteChannelInfoLength = 0;
2803         req->Channel = 0;
2804         req->Offset = cpu_to_le64(wdata->offset);
2805         /* 4 for rfc1002 length field */
2806         req->DataOffset = cpu_to_le16(
2807                                 offsetof(struct smb2_write_req, Buffer) - 4);
2808         req->RemainingBytes = 0;
2809 
2810         /* 4 for rfc1002 length field and 1 for Buffer */
2811         iov[0].iov_len = 4;
2812         iov[0].iov_base = req;
2813         iov[1].iov_len = get_rfc1002_length(req) - 1;
2814         iov[1].iov_base = (char *)req + 4;
2815 
2816         rqst.rq_iov = iov;
2817         rqst.rq_nvec = 2;
2818         rqst.rq_pages = wdata->pages;
2819         rqst.rq_npages = wdata->nr_pages;
2820         rqst.rq_pagesz = wdata->pagesz;
2821         rqst.rq_tailsz = wdata->tailsz;
2822 
2823         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2824                  wdata->offset, wdata->bytes);
2825 
2826         req->Length = cpu_to_le32(wdata->bytes);
2827 
2828         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2829 
2830         if (wdata->credits) {
2831                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2832                                                     SMB2_MAX_BUFFER_SIZE));
2833                 shdr->CreditRequest = shdr->CreditCharge;
2834                 spin_lock(&server->req_lock);
2835                 server->credits += wdata->credits -
2836                                                 le16_to_cpu(shdr->CreditCharge);
2837                 spin_unlock(&server->req_lock);
2838                 wake_up(&server->request_q);
2839                 flags |= CIFS_HAS_CREDITS;
2840         }
2841 
2842         kref_get(&wdata->refcount);
2843         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2844                              wdata, flags);
2845 
2846         if (rc) {
2847                 kref_put(&wdata->refcount, release);
2848                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2849         }
2850 
2851 async_writev_out:
2852         cifs_small_buf_release(req);
2853         return rc;
2854 }
2855 
2856 /*
2857  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2858  * The length field from io_parms must be at least 1 and indicates a number of
2859  * elements with data to write that begins with position 1 in iov array. All
2860  * data length is specified by count.
2861  */
2862 int
2863 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2864            unsigned int *nbytes, struct kvec *iov, int n_vec)
2865 {
2866         int rc = 0;
2867         struct smb2_write_req *req = NULL;
2868         struct smb2_write_rsp *rsp = NULL;
2869         int resp_buftype;
2870         struct kvec rsp_iov;
2871         int flags = 0;
2872 
2873         *nbytes = 0;
2874 
2875         if (n_vec < 1)
2876                 return rc;
2877 
2878         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2879         if (rc)
2880                 return rc;
2881 
2882         if (io_parms->tcon->ses->server == NULL)
2883                 return -ECONNABORTED;
2884 
2885         if (encryption_required(io_parms->tcon))
2886                 flags |= CIFS_TRANSFORM_REQ;
2887 
2888         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2889 
2890         req->PersistentFileId = io_parms->persistent_fid;
2891         req->VolatileFileId = io_parms->volatile_fid;
2892         req->WriteChannelInfoOffset = 0;
2893         req->WriteChannelInfoLength = 0;
2894         req->Channel = 0;
2895         req->Length = cpu_to_le32(io_parms->length);
2896         req->Offset = cpu_to_le64(io_parms->offset);
2897         /* 4 for rfc1002 length field */
2898         req->DataOffset = cpu_to_le16(
2899                                 offsetof(struct smb2_write_req, Buffer) - 4);
2900         req->RemainingBytes = 0;
2901 
2902         iov[0].iov_base = (char *)req;
2903         /* 4 for rfc1002 length field and 1 for Buffer */
2904         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2905 
2906         /* length of entire message including data to be written */
2907         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2908 
2909         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2910                           &resp_buftype, flags, &rsp_iov);
2911         cifs_small_buf_release(req);
2912         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2913 
2914         if (rc) {
2915                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2916                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2917         } else
2918                 *nbytes = le32_to_cpu(rsp->DataLength);
2919 
2920         free_rsp_buf(resp_buftype, rsp);
2921         return rc;
2922 }
2923 
2924 static unsigned int
2925 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2926 {
2927         int len;
2928         unsigned int entrycount = 0;
2929         unsigned int next_offset = 0;
2930         FILE_DIRECTORY_INFO *entryptr;
2931 
2932         if (bufstart == NULL)
2933                 return 0;
2934 
2935         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2936 
2937         while (1) {
2938                 entryptr = (FILE_DIRECTORY_INFO *)
2939                                         ((char *)entryptr + next_offset);
2940 
2941                 if ((char *)entryptr + size > end_of_buf) {
2942                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2943                         break;
2944                 }
2945 
2946                 len = le32_to_cpu(entryptr->FileNameLength);
2947                 if ((char *)entryptr + len + size > end_of_buf) {
2948                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2949                                  end_of_buf);
2950                         break;
2951                 }
2952 
2953                 *lastentry = (char *)entryptr;
2954                 entrycount++;
2955 
2956                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2957                 if (!next_offset)
2958                         break;
2959         }
2960 
2961         return entrycount;
2962 }
2963 
2964 /*
2965  * Readdir/FindFirst
2966  */
2967 int
2968 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2969                      u64 persistent_fid, u64 volatile_fid, int index,
2970                      struct cifs_search_info *srch_inf)
2971 {
2972         struct smb2_query_directory_req *req;
2973         struct smb2_query_directory_rsp *rsp = NULL;
2974         struct kvec iov[2];
2975         struct kvec rsp_iov;
2976         int rc = 0;
2977         int len;
2978         int resp_buftype = CIFS_NO_BUFFER;
2979         unsigned char *bufptr;
2980         struct TCP_Server_Info *server;
2981         struct cifs_ses *ses = tcon->ses;
2982         __le16 asteriks = cpu_to_le16('*');
2983         char *end_of_smb;
2984         unsigned int output_size = CIFSMaxBufSize;
2985         size_t info_buf_size;
2986         int flags = 0;
2987 
2988         if (ses && (ses->server))
2989                 server = ses->server;
2990         else
2991                 return -EIO;
2992 
2993         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2994         if (rc)
2995                 return rc;
2996 
2997         if (encryption_required(tcon))
2998                 flags |= CIFS_TRANSFORM_REQ;
2999 
3000         switch (srch_inf->info_level) {
3001         case SMB_FIND_FILE_DIRECTORY_INFO:
3002                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3003                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3004                 break;
3005         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3006                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3007                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3008                 break;
3009         default:
3010                 cifs_dbg(VFS, "info level %u isn't supported\n",
3011                          srch_inf->info_level);
3012                 rc = -EINVAL;
3013                 goto qdir_exit;
3014         }
3015 
3016         req->FileIndex = cpu_to_le32(index);
3017         req->PersistentFileId = persistent_fid;
3018         req->VolatileFileId = volatile_fid;
3019 
3020         len = 0x2;
3021         bufptr = req->Buffer;
3022         memcpy(bufptr, &asteriks, len);
3023 
3024         req->FileNameOffset =
3025                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
3026         req->FileNameLength = cpu_to_le16(len);
3027         /*
3028          * BB could be 30 bytes or so longer if we used SMB2 specific
3029          * buffer lengths, but this is safe and close enough.
3030          */
3031         output_size = min_t(unsigned int, output_size, server->maxBuf);
3032         output_size = min_t(unsigned int, output_size, 2 << 15);
3033         req->OutputBufferLength = cpu_to_le32(output_size);
3034 
3035         iov[0].iov_base = (char *)req;
3036         /* 4 for RFC1001 length and 1 for Buffer */
3037         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
3038 
3039         iov[1].iov_base = (char *)(req->Buffer);
3040         iov[1].iov_len = len;
3041 
3042         inc_rfc1001_len(req, len - 1 /* Buffer */);
3043 
3044         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3045         cifs_small_buf_release(req);
3046         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3047 
3048         if (rc) {
3049                 if (rc == -ENODATA &&
3050                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3051                         srch_inf->endOfSearch = true;
3052                         rc = 0;
3053                 }
3054                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3055                 goto qdir_exit;
3056         }
3057 
3058         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3059                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3060                           info_buf_size);
3061         if (rc)
3062                 goto qdir_exit;
3063 
3064         srch_inf->unicode = true;
3065 
3066         if (srch_inf->ntwrk_buf_start) {
3067                 if (srch_inf->smallBuf)
3068                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3069                 else
3070                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3071         }
3072         srch_inf->ntwrk_buf_start = (char *)rsp;
3073         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
3074                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
3075         /* 4 for rfc1002 length field */
3076         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
3077         srch_inf->entries_in_buffer =
3078                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3079                                     &srch_inf->last_entry, info_buf_size);
3080         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3081         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3082                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3083                  srch_inf->srch_entries_start, srch_inf->last_entry);
3084         if (resp_buftype == CIFS_LARGE_BUFFER)
3085                 srch_inf->smallBuf = false;
3086         else if (resp_buftype == CIFS_SMALL_BUFFER)
3087                 srch_inf->smallBuf = true;
3088         else
3089                 cifs_dbg(VFS, "illegal search buffer type\n");
3090 
3091         return rc;
3092 
3093 qdir_exit:
3094         free_rsp_buf(resp_buftype, rsp);
3095         return rc;
3096 }
3097 
3098 static int
3099 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3100                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3101                u8 info_type, u32 additional_info, unsigned int num,
3102                 void **data, unsigned int *size)
3103 {
3104         struct smb2_set_info_req *req;
3105         struct smb2_set_info_rsp *rsp = NULL;
3106         struct kvec *iov;
3107         struct kvec rsp_iov;
3108         int rc = 0;
3109         int resp_buftype;
3110         unsigned int i;
3111         struct cifs_ses *ses = tcon->ses;
3112         int flags = 0;
3113 
3114         if (!ses || !(ses->server))
3115                 return -EIO;
3116 
3117         if (!num)
3118                 return -EINVAL;
3119 
3120         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3121         if (!iov)
3122                 return -ENOMEM;
3123 
3124         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3125         if (rc) {
3126                 kfree(iov);
3127                 return rc;
3128         }
3129 
3130         if (encryption_required(tcon))
3131                 flags |= CIFS_TRANSFORM_REQ;
3132 
3133         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3134 
3135         req->InfoType = info_type;
3136         req->FileInfoClass = info_class;
3137         req->PersistentFileId = persistent_fid;
3138         req->VolatileFileId = volatile_fid;
3139         req->AdditionalInformation = cpu_to_le32(additional_info);
3140 
3141         /* 4 for RFC1001 length and 1 for Buffer */
3142         req->BufferOffset =
3143                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3144         req->BufferLength = cpu_to_le32(*size);
3145 
3146         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3147 
3148         memcpy(req->Buffer, *data, *size);
3149 
3150         iov[0].iov_base = (char *)req;
3151         /* 4 for RFC1001 length */
3152         iov[0].iov_len = get_rfc1002_length(req) + 4;
3153 
3154         for (i = 1; i < num; i++) {
3155                 inc_rfc1001_len(req, size[i]);
3156                 le32_add_cpu(&req->BufferLength, size[i]);
3157                 iov[i].iov_base = (char *)data[i];
3158                 iov[i].iov_len = size[i];
3159         }
3160 
3161         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3162         cifs_small_buf_release(req);
3163         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3164 
3165         if (rc != 0)
3166                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3167 
3168         free_rsp_buf(resp_buftype, rsp);
3169         kfree(iov);
3170         return rc;
3171 }
3172 
3173 int
3174 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3175             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3176 {
3177         struct smb2_file_rename_info info;
3178         void **data;
3179         unsigned int size[2];
3180         int rc;
3181         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3182 
3183         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3184         if (!data)
3185                 return -ENOMEM;
3186 
3187         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3188                               /* 0 = fail if target already exists */
3189         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3190         info.FileNameLength = cpu_to_le32(len);
3191 
3192         data[0] = &info;
3193         size[0] = sizeof(struct smb2_file_rename_info);
3194 
3195         data[1] = target_file;
3196         size[1] = len + 2 /* null */;
3197 
3198         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3199                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3200                 0, 2, data, size);
3201         kfree(data);
3202         return rc;
3203 }
3204 
3205 int
3206 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3207                   u64 persistent_fid, u64 volatile_fid)
3208 {
3209         __u8 delete_pending = 1;
3210         void *data;
3211         unsigned int size;
3212 
3213         data = &delete_pending;
3214         size = 1; /* sizeof __u8 */
3215 
3216         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3217                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3218                 0, 1, &data, &size);
3219 }
3220 
3221 int
3222 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3223                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3224 {
3225         struct smb2_file_link_info info;
3226         void **data;
3227         unsigned int size[2];
3228         int rc;
3229         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3230 
3231         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3232         if (!data)
3233                 return -ENOMEM;
3234 
3235         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3236                               /* 0 = fail if link already exists */
3237         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3238         info.FileNameLength = cpu_to_le32(len);
3239 
3240         data[0] = &info;
3241         size[0] = sizeof(struct smb2_file_link_info);
3242 
3243         data[1] = target_file;
3244         size[1] = len + 2 /* null */;
3245 
3246         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3247                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3248                         0, 2, data, size);
3249         kfree(data);
3250         return rc;
3251 }
3252 
3253 int
3254 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3255              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3256 {
3257         struct smb2_file_eof_info info;
3258         void *data;
3259         unsigned int size;
3260 
3261         info.EndOfFile = *eof;
3262 
3263         data = &info;
3264         size = sizeof(struct smb2_file_eof_info);
3265 
3266         if (is_falloc)
3267                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3268                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3269                         0, 1, &data, &size);
3270         else
3271                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3272                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3273                         0, 1, &data, &size);
3274 }
3275 
3276 int
3277 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3278               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3279 {
3280         unsigned int size;
3281         size = sizeof(FILE_BASIC_INFO);
3282         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3283                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3284                 0, 1, (void **)&buf, &size);
3285 }
3286 
3287 int
3288 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3289                 u64 persistent_fid, u64 volatile_fid,
3290                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3291 {
3292         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3293                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3294                         1, (void **)&pnntsd, &pacllen);
3295 }
3296 
3297 int
3298 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3299             u64 persistent_fid, u64 volatile_fid,
3300             struct smb2_file_full_ea_info *buf, int len)
3301 {
3302         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3303                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3304                 0, 1, (void **)&buf, &len);
3305 }
3306 
3307 int
3308 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3309                   const u64 persistent_fid, const u64 volatile_fid,
3310                   __u8 oplock_level)
3311 {
3312         int rc;
3313         struct smb2_oplock_break *req = NULL;
3314         int flags = CIFS_OBREAK_OP;
3315 
3316         cifs_dbg(FYI, "SMB2_oplock_break\n");
3317         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3318         if (rc)
3319                 return rc;
3320 
3321         if (encryption_required(tcon))
3322                 flags |= CIFS_TRANSFORM_REQ;
3323 
3324         req->VolatileFid = volatile_fid;
3325         req->PersistentFid = persistent_fid;
3326         req->OplockLevel = oplock_level;
3327         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3328 
3329         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3330         cifs_small_buf_release(req);
3331 
3332         if (rc) {
3333                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3334                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3335         }
3336 
3337         return rc;
3338 }
3339 
3340 static void
3341 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3342                         struct kstatfs *kst)
3343 {
3344         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3345                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3346         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3347         kst->f_bfree  = kst->f_bavail =
3348                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3349         return;
3350 }
3351 
3352 static int
3353 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3354                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3355 {
3356         int rc;
3357         struct smb2_query_info_req *req;
3358 
3359         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3360 
3361         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3362                 return -EIO;
3363 
3364         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3365         if (rc)
3366                 return rc;
3367 
3368         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3369         req->FileInfoClass = level;
3370         req->PersistentFileId = persistent_fid;
3371         req->VolatileFileId = volatile_fid;
3372         /* 4 for rfc1002 length field and 1 for pad */
3373         req->InputBufferOffset =
3374                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3375         req->OutputBufferLength = cpu_to_le32(
3376                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3377 
3378         iov->iov_base = (char *)req;
3379         /* 4 for rfc1002 length field */
3380         iov->iov_len = get_rfc1002_length(req) + 4;
3381         return 0;
3382 }
3383 
3384 int
3385 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3386               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3387 {
3388         struct smb2_query_info_rsp *rsp = NULL;
3389         struct kvec iov;
3390         struct kvec rsp_iov;
3391         int rc = 0;
3392         int resp_buftype;
3393         struct cifs_ses *ses = tcon->ses;
3394         struct smb2_fs_full_size_info *info = NULL;
3395         int flags = 0;
3396 
3397         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3398                                 sizeof(struct smb2_fs_full_size_info),
3399                                 persistent_fid, volatile_fid);
3400         if (rc)
3401                 return rc;
3402 
3403         if (encryption_required(tcon))
3404                 flags |= CIFS_TRANSFORM_REQ;
3405 
3406         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3407         cifs_small_buf_release(iov.iov_base);
3408         if (rc) {
3409                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3410                 goto qfsinf_exit;
3411         }
3412         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3413 
3414         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3415                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3416         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3417                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3418                           sizeof(struct smb2_fs_full_size_info));
3419         if (!rc)
3420                 copy_fs_info_to_kstatfs(info, fsdata);
3421 
3422 qfsinf_exit:
3423         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3424         return rc;
3425 }
3426 
3427 int
3428 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3429               u64 persistent_fid, u64 volatile_fid, int level)
3430 {
3431         struct smb2_query_info_rsp *rsp = NULL;
3432         struct kvec iov;
3433         struct kvec rsp_iov;
3434         int rc = 0;
3435         int resp_buftype, max_len, min_len;
3436         struct cifs_ses *ses = tcon->ses;
3437         unsigned int rsp_len, offset;
3438         int flags = 0;
3439 
3440         if (level == FS_DEVICE_INFORMATION) {
3441                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3442                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3443         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3444                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3445                 min_len = MIN_FS_ATTR_INFO_SIZE;
3446         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3447                 max_len = sizeof(struct smb3_fs_ss_info);
3448                 min_len = sizeof(struct smb3_fs_ss_info);
3449         } else {
3450                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3451                 return -EINVAL;
3452         }
3453 
3454         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3455                                 persistent_fid, volatile_fid);
3456         if (rc)
3457                 return rc;
3458 
3459         if (encryption_required(tcon))
3460                 flags |= CIFS_TRANSFORM_REQ;
3461 
3462         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3463         cifs_small_buf_release(iov.iov_base);
3464         if (rc) {
3465                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3466                 goto qfsattr_exit;
3467         }
3468         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3469 
3470         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3471         offset = le16_to_cpu(rsp->OutputBufferOffset);
3472         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3473         if (rc)
3474                 goto qfsattr_exit;
3475 
3476         if (level == FS_ATTRIBUTE_INFORMATION)
3477                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3478                         + (char *)&rsp->hdr, min_t(unsigned int,
3479                         rsp_len, max_len));
3480         else if (level == FS_DEVICE_INFORMATION)
3481                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3482                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3483         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3484                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3485                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3486                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3487                 tcon->perf_sector_size =
3488                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3489         }
3490 
3491 qfsattr_exit:
3492         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3493         return rc;
3494 }
3495 
3496 int
3497 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3498            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3499            const __u32 num_lock, struct smb2_lock_element *buf)
3500 {
3501         int rc = 0;
3502         struct smb2_lock_req *req = NULL;
3503         struct kvec iov[2];
3504         struct kvec rsp_iov;
3505         int resp_buf_type;
3506         unsigned int count;
3507         int flags = CIFS_NO_RESP;
3508 
3509         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3510 
3511         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3512         if (rc)
3513                 return rc;
3514 
3515         if (encryption_required(tcon))
3516                 flags |= CIFS_TRANSFORM_REQ;
3517 
3518         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3519         req->LockCount = cpu_to_le16(num_lock);
3520 
3521         req->PersistentFileId = persist_fid;
3522         req->VolatileFileId = volatile_fid;
3523 
3524         count = num_lock * sizeof(struct smb2_lock_element);
3525         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3526 
3527         iov[0].iov_base = (char *)req;
3528         /* 4 for rfc1002 length field and count for all locks */
3529         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3530         iov[1].iov_base = (char *)buf;
3531         iov[1].iov_len = count;
3532 
3533         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3534         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3535                           &rsp_iov);
3536         cifs_small_buf_release(req);
3537         if (rc) {
3538                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3539                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3540         }
3541 
3542         return rc;
3543 }
3544 
3545 int
3546 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3547           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3548           const __u64 length, const __u64 offset, const __u32 lock_flags,
3549           const bool wait)
3550 {
3551         struct smb2_lock_element lock;
3552 
3553         lock.Offset = cpu_to_le64(offset);
3554         lock.Length = cpu_to_le64(length);
3555         lock.Flags = cpu_to_le32(lock_flags);
3556         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3557                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3558 
3559         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3560 }
3561 
3562 int
3563 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3564                  __u8 *lease_key, const __le32 lease_state)
3565 {
3566         int rc;
3567         struct smb2_lease_ack *req = NULL;
3568         int flags = CIFS_OBREAK_OP;
3569 
3570         cifs_dbg(FYI, "SMB2_lease_break\n");
3571         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3572         if (rc)
3573                 return rc;
3574 
3575         if (encryption_required(tcon))
3576                 flags |= CIFS_TRANSFORM_REQ;
3577 
3578         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3579         req->StructureSize = cpu_to_le16(36);
3580         inc_rfc1001_len(req, 12);
3581 
3582         memcpy(req->LeaseKey, lease_key, 16);
3583         req->LeaseState = lease_state;
3584 
3585         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3586         cifs_small_buf_release(req);
3587 
3588         if (rc) {
3589                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3590                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3591         }
3592 
3593         return rc;
3594 }
3595 

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