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

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
  5  *                 Etersoft, 2012
  6  *   Author(s): Steve French (sfrench@us.ibm.com)
  7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
  8  *
  9  *   Contains the routines for constructing the SMB2 PDUs themselves
 10  *
 11  *   This library is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU Lesser General Public License as published
 13  *   by the Free Software Foundation; either version 2.1 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This library is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 19  *   the GNU Lesser General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU Lesser General Public License
 22  *   along with this library; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  */
 25 
 26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 27  /* Note that there are handle based routines which must be                   */
 28  /* treated slightly differently for reconnection purposes since we never     */
 29  /* want to reuse a stale file handle and only the caller knows the file info */
 30 
 31 #include <linux/fs.h>
 32 #include <linux/kernel.h>
 33 #include <linux/vfs.h>
 34 #include <linux/task_io_accounting_ops.h>
 35 #include <linux/uaccess.h>
 36 #include <linux/pagemap.h>
 37 #include <linux/xattr.h>
 38 #include "smb2pdu.h"
 39 #include "cifsglob.h"
 40 #include "cifsacl.h"
 41 #include "cifsproto.h"
 42 #include "smb2proto.h"
 43 #include "cifs_unicode.h"
 44 #include "cifs_debug.h"
 45 #include "ntlmssp.h"
 46 #include "smb2status.h"
 47 #include "smb2glob.h"
 48 #include "cifspdu.h"
 49 #include "cifs_spnego.h"
 50 
 51 /*
 52  *  The following table defines the expected "StructureSize" of SMB2 requests
 53  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 54  *
 55  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 56  *  indexed by command in host byte order.
 57  */
 58 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
 59         /* SMB2_NEGOTIATE */ 36,
 60         /* SMB2_SESSION_SETUP */ 25,
 61         /* SMB2_LOGOFF */ 4,
 62         /* SMB2_TREE_CONNECT */ 9,
 63         /* SMB2_TREE_DISCONNECT */ 4,
 64         /* SMB2_CREATE */ 57,
 65         /* SMB2_CLOSE */ 24,
 66         /* SMB2_FLUSH */ 24,
 67         /* SMB2_READ */ 49,
 68         /* SMB2_WRITE */ 49,
 69         /* SMB2_LOCK */ 48,
 70         /* SMB2_IOCTL */ 57,
 71         /* SMB2_CANCEL */ 4,
 72         /* SMB2_ECHO */ 4,
 73         /* SMB2_QUERY_DIRECTORY */ 33,
 74         /* SMB2_CHANGE_NOTIFY */ 32,
 75         /* SMB2_QUERY_INFO */ 41,
 76         /* SMB2_SET_INFO */ 33,
 77         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
 78 };
 79 
 80 
 81 static void
 82 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
 83                   const struct cifs_tcon *tcon)
 84 {
 85         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
 86         char *temp = (char *)hdr;
 87         /* lookup word count ie StructureSize from table */
 88         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
 89 
 90         /*
 91          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 92          * largest operations (Create)
 93          */
 94         memset(temp, 0, 256);
 95 
 96         /* Note this is only network field converted to big endian */
 97         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
 98                         - 4 /*  RFC 1001 length field itself not counted */);
 99 
100         hdr->ProtocolId = SMB2_PROTO_NUMBER;
101         hdr->StructureSize = cpu_to_le16(64);
102         hdr->Command = smb2_cmd;
103         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
104         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
105 
106         if (!tcon)
107                 goto out;
108 
109         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
110         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
111         if ((tcon->ses) && (tcon->ses->server) &&
112             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
113                 hdr->CreditCharge = cpu_to_le16(1);
114         /* else CreditCharge MBZ */
115 
116         hdr->TreeId = tcon->tid;
117         /* Uid is not converted */
118         if (tcon->ses)
119                 hdr->SessionId = tcon->ses->Suid;
120 
121         /*
122          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
123          * to pass the path on the Open SMB prefixed by \\server\share.
124          * Not sure when we would need to do the augmented path (if ever) and
125          * setting this flag breaks the SMB2 open operation since it is
126          * illegal to send an empty path name (without \\server\share prefix)
127          * when the DFS flag is set in the SMB open header. We could
128          * consider setting the flag on all operations other than open
129          * but it is safer to net set it for now.
130          */
131 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
132                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
133 
134         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
135                 hdr->Flags |= SMB2_FLAGS_SIGNED;
136 out:
137         pdu->StructureSize2 = cpu_to_le16(parmsize);
138         return;
139 }
140 
141 static int
142 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
143 {
144         int rc = 0;
145         struct nls_table *nls_codepage;
146         struct cifs_ses *ses;
147         struct TCP_Server_Info *server;
148 
149         /*
150          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
151          * check for tcp and smb session status done differently
152          * for those three - in the calling routine.
153          */
154         if (tcon == NULL)
155                 return rc;
156 
157         if (smb2_command == SMB2_TREE_CONNECT)
158                 return rc;
159 
160         if (tcon->tidStatus == CifsExiting) {
161                 /*
162                  * only tree disconnect, open, and write,
163                  * (and ulogoff which does not have tcon)
164                  * are allowed as we start force umount.
165                  */
166                 if ((smb2_command != SMB2_WRITE) &&
167                    (smb2_command != SMB2_CREATE) &&
168                    (smb2_command != SMB2_TREE_DISCONNECT)) {
169                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
170                                  smb2_command);
171                         return -ENODEV;
172                 }
173         }
174         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
175             (!tcon->ses->server))
176                 return -EIO;
177 
178         ses = tcon->ses;
179         server = ses->server;
180 
181         /*
182          * Give demultiplex thread up to 10 seconds to reconnect, should be
183          * greater than cifs socket timeout which is 7 seconds
184          */
185         while (server->tcpStatus == CifsNeedReconnect) {
186                 /*
187                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
188                  * here since they are implicitly done when session drops.
189                  */
190                 switch (smb2_command) {
191                 /*
192                  * BB Should we keep oplock break and add flush to exceptions?
193                  */
194                 case SMB2_TREE_DISCONNECT:
195                 case SMB2_CANCEL:
196                 case SMB2_CLOSE:
197                 case SMB2_OPLOCK_BREAK:
198                         return -EAGAIN;
199                 }
200 
201                 wait_event_interruptible_timeout(server->response_q,
202                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
203 
204                 /* are we still trying to reconnect? */
205                 if (server->tcpStatus != CifsNeedReconnect)
206                         break;
207 
208                 /*
209                  * on "soft" mounts we wait once. Hard mounts keep
210                  * retrying until process is killed or server comes
211                  * back on-line
212                  */
213                 if (!tcon->retry) {
214                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
215                         return -EHOSTDOWN;
216                 }
217         }
218 
219         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
220                 return rc;
221 
222         nls_codepage = load_nls_default();
223 
224         /*
225          * need to prevent multiple threads trying to simultaneously reconnect
226          * the same SMB session
227          */
228         mutex_lock(&tcon->ses->session_mutex);
229         rc = cifs_negotiate_protocol(0, tcon->ses);
230         if (!rc && tcon->ses->need_reconnect)
231                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
232 
233         if (rc || !tcon->need_reconnect) {
234                 mutex_unlock(&tcon->ses->session_mutex);
235                 goto out;
236         }
237 
238         cifs_mark_open_files_invalid(tcon);
239         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
240         mutex_unlock(&tcon->ses->session_mutex);
241         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
242         if (rc)
243                 goto out;
244         atomic_inc(&tconInfoReconnectCount);
245 out:
246         /*
247          * Check if handle based operation so we know whether we can continue
248          * or not without returning to caller to reset file handle.
249          */
250         /*
251          * BB Is flush done by server on drop of tcp session? Should we special
252          * case it and skip above?
253          */
254         switch (smb2_command) {
255         case SMB2_FLUSH:
256         case SMB2_READ:
257         case SMB2_WRITE:
258         case SMB2_LOCK:
259         case SMB2_IOCTL:
260         case SMB2_QUERY_DIRECTORY:
261         case SMB2_CHANGE_NOTIFY:
262         case SMB2_QUERY_INFO:
263         case SMB2_SET_INFO:
264                 return -EAGAIN;
265         }
266         unload_nls(nls_codepage);
267         return rc;
268 }
269 
270 /*
271  * Allocate and return pointer to an SMB request hdr, and set basic
272  * SMB information in the SMB header. If the return code is zero, this
273  * function must have filled in request_buf pointer.
274  */
275 static int
276 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
277                 void **request_buf)
278 {
279         int rc = 0;
280 
281         rc = smb2_reconnect(smb2_command, tcon);
282         if (rc)
283                 return rc;
284 
285         /* BB eventually switch this to SMB2 specific small buf size */
286         *request_buf = cifs_small_buf_get();
287         if (*request_buf == NULL) {
288                 /* BB should we add a retry in here if not a writepage? */
289                 return -ENOMEM;
290         }
291 
292         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
293 
294         if (tcon != NULL) {
295 #ifdef CONFIG_CIFS_STATS2
296                 uint16_t com_code = le16_to_cpu(smb2_command);
297                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
298 #endif
299                 cifs_stats_inc(&tcon->num_smbs_sent);
300         }
301 
302         return rc;
303 }
304 
305 #ifdef CONFIG_CIFS_SMB311
306 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
307 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
308 
309 
310 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
311 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
312 
313 static void
314 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
315 {
316         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
317         pneg_ctxt->DataLength = cpu_to_le16(38);
318         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
319         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
320         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
321         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
322 }
323 
324 static void
325 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
326 {
327         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
328         pneg_ctxt->DataLength = cpu_to_le16(6);
329         pneg_ctxt->CipherCount = cpu_to_le16(2);
330         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
331         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
332 }
333 
334 static void
335 assemble_neg_contexts(struct smb2_negotiate_req *req)
336 {
337 
338         /* +4 is to account for the RFC1001 len field */
339         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
340 
341         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
342         /* Add 2 to size to round to 8 byte boundary */
343         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
344         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
345         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
346         req->NegotiateContextCount = cpu_to_le16(2);
347         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
348                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
349 }
350 #else
351 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
352 {
353         return;
354 }
355 #endif /* SMB311 */
356 
357 
358 /*
359  *
360  *      SMB2 Worker functions follow:
361  *
362  *      The general structure of the worker functions is:
363  *      1) Call smb2_init (assembles SMB2 header)
364  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
365  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
366  *      4) Decode SMB2 command specific fields in the fixed length area
367  *      5) Decode variable length data area (if any for this SMB2 command type)
368  *      6) Call free smb buffer
369  *      7) return
370  *
371  */
372 
373 int
374 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
375 {
376         struct smb2_negotiate_req *req;
377         struct smb2_negotiate_rsp *rsp;
378         struct kvec iov[1];
379         int rc = 0;
380         int resp_buftype;
381         struct TCP_Server_Info *server = ses->server;
382         int blob_offset, blob_length;
383         char *security_blob;
384         int flags = CIFS_NEG_OP;
385 
386         cifs_dbg(FYI, "Negotiate protocol\n");
387 
388         if (!server) {
389                 WARN(1, "%s: server is NULL!\n", __func__);
390                 return -EIO;
391         }
392 
393         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
394         if (rc)
395                 return rc;
396 
397         req->hdr.SessionId = 0;
398 
399         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
400 
401         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
402         inc_rfc1001_len(req, 2);
403 
404         /* only one of SMB2 signing flags may be set in SMB2 request */
405         if (ses->sign)
406                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
407         else if (global_secflags & CIFSSEC_MAY_SIGN)
408                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
409         else
410                 req->SecurityMode = 0;
411 
412         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
413 
414         /* ClientGUID must be zero for SMB2.02 dialect */
415         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
416                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
417         else {
418                 memcpy(req->ClientGUID, server->client_guid,
419                         SMB2_CLIENT_GUID_SIZE);
420                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
421                         assemble_neg_contexts(req);
422         }
423         iov[0].iov_base = (char *)req;
424         /* 4 for rfc1002 length field */
425         iov[0].iov_len = get_rfc1002_length(req) + 4;
426 
427         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
428 
429         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
430         /*
431          * No tcon so can't do
432          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
433          */
434         if (rc != 0)
435                 goto neg_exit;
436 
437         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
438 
439         /* BB we may eventually want to match the negotiated vs. requested
440            dialect, even though we are only requesting one at a time */
441         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
442                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
443         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
444                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
445         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
446                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
447         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
448                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
449 #ifdef CONFIG_CIFS_SMB311
450         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
451                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
452 #endif /* SMB311 */
453         else {
454                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
455                          le16_to_cpu(rsp->DialectRevision));
456                 rc = -EIO;
457                 goto neg_exit;
458         }
459         server->dialect = le16_to_cpu(rsp->DialectRevision);
460 
461         /* SMB2 only has an extended negflavor */
462         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
463         /* set it to the maximum buffer size value we can send with 1 credit */
464         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
465                                SMB2_MAX_BUFFER_SIZE);
466         server->max_read = le32_to_cpu(rsp->MaxReadSize);
467         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
468         /* BB Do we need to validate the SecurityMode? */
469         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
470         server->capabilities = le32_to_cpu(rsp->Capabilities);
471         /* Internal types */
472         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
473 
474         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
475                                                &rsp->hdr);
476         /*
477          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
478          * for us will be
479          *      ses->sectype = RawNTLMSSP;
480          * but for time being this is our only auth choice so doesn't matter.
481          * We just found a server which sets blob length to zero expecting raw.
482          */
483         if (blob_length == 0)
484                 cifs_dbg(FYI, "missing security blob on negprot\n");
485 
486         rc = cifs_enable_signing(server, ses->sign);
487         if (rc)
488                 goto neg_exit;
489         if (blob_length) {
490                 rc = decode_negTokenInit(security_blob, blob_length, server);
491                 if (rc == 1)
492                         rc = 0;
493                 else if (rc == 0)
494                         rc = -EIO;
495         }
496 neg_exit:
497         free_rsp_buf(resp_buftype, rsp);
498         return rc;
499 }
500 
501 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
502 {
503         int rc = 0;
504         struct validate_negotiate_info_req vneg_inbuf;
505         struct validate_negotiate_info_rsp *pneg_rsp;
506         u32 rsplen;
507 
508         cifs_dbg(FYI, "validate negotiate\n");
509 
510         /*
511          * validation ioctl must be signed, so no point sending this if we
512          * can not sign it.  We could eventually change this to selectively
513          * sign just this, the first and only signed request on a connection.
514          * This is good enough for now since a user who wants better security
515          * would also enable signing on the mount. Having validation of
516          * negotiate info for signed connections helps reduce attack vectors
517          */
518         if (tcon->ses->server->sign == false)
519                 return 0; /* validation requires signing */
520 
521         vneg_inbuf.Capabilities =
522                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
523         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
524                                         SMB2_CLIENT_GUID_SIZE);
525 
526         if (tcon->ses->sign)
527                 vneg_inbuf.SecurityMode =
528                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
529         else if (global_secflags & CIFSSEC_MAY_SIGN)
530                 vneg_inbuf.SecurityMode =
531                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
532         else
533                 vneg_inbuf.SecurityMode = 0;
534 
535         vneg_inbuf.DialectCount = cpu_to_le16(1);
536         vneg_inbuf.Dialects[0] =
537                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
538 
539         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
540                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
541                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
542                 (char **)&pneg_rsp, &rsplen);
543 
544         if (rc != 0) {
545                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
546                 return -EIO;
547         }
548 
549         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
550                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
551                 return -EIO;
552         }
553 
554         /* check validate negotiate info response matches what we got earlier */
555         if (pneg_rsp->Dialect !=
556                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
557                 goto vneg_out;
558 
559         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
560                 goto vneg_out;
561 
562         /* do not validate server guid because not saved at negprot time yet */
563 
564         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
565               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
566                 goto vneg_out;
567 
568         /* validate negotiate successful */
569         cifs_dbg(FYI, "validate negotiate info successful\n");
570         return 0;
571 
572 vneg_out:
573         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
574         return -EIO;
575 }
576 
577 int
578 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
579                 const struct nls_table *nls_cp)
580 {
581         struct smb2_sess_setup_req *req;
582         struct smb2_sess_setup_rsp *rsp = NULL;
583         struct kvec iov[2];
584         int rc = 0;
585         int resp_buftype = CIFS_NO_BUFFER;
586         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
587         struct TCP_Server_Info *server = ses->server;
588         u16 blob_length = 0;
589         struct key *spnego_key = NULL;
590         char *security_blob = NULL;
591         unsigned char *ntlmssp_blob = NULL;
592         bool use_spnego = false; /* else use raw ntlmssp */
593 
594         cifs_dbg(FYI, "Session Setup\n");
595 
596         if (!server) {
597                 WARN(1, "%s: server is NULL!\n", __func__);
598                 return -EIO;
599         }
600 
601         /*
602          * If we are here due to reconnect, free per-smb session key
603          * in case signing was required.
604          */
605         kfree(ses->auth_key.response);
606         ses->auth_key.response = NULL;
607 
608         /*
609          * If memory allocation is successful, caller of this function
610          * frees it.
611          */
612         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
613         if (!ses->ntlmssp)
614                 return -ENOMEM;
615         ses->ntlmssp->sesskey_per_smbsess = true;
616 
617         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
618         if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
619                 ses->sectype = RawNTLMSSP;
620 
621 ssetup_ntlmssp_authenticate:
622         if (phase == NtLmChallenge)
623                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
624 
625         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
626         if (rc)
627                 return rc;
628 
629         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
630         req->Flags = 0; /* MBZ */
631         /* to enable echos and oplocks */
632         req->hdr.CreditRequest = cpu_to_le16(3);
633 
634         /* only one of SMB2 signing flags may be set in SMB2 request */
635         if (server->sign)
636                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
637         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
638                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
639         else
640                 req->SecurityMode = 0;
641 
642         req->Capabilities = 0;
643         req->Channel = 0; /* MBZ */
644 
645         iov[0].iov_base = (char *)req;
646         /* 4 for rfc1002 length field and 1 for pad */
647         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
648 
649         if (ses->sectype == Kerberos) {
650 #ifdef CONFIG_CIFS_UPCALL
651                 struct cifs_spnego_msg *msg;
652 
653                 spnego_key = cifs_get_spnego_key(ses);
654                 if (IS_ERR(spnego_key)) {
655                         rc = PTR_ERR(spnego_key);
656                         spnego_key = NULL;
657                         goto ssetup_exit;
658                 }
659 
660                 msg = spnego_key->payload.data[0];
661                 /*
662                  * check version field to make sure that cifs.upcall is
663                  * sending us a response in an expected form
664                  */
665                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
666                         cifs_dbg(VFS,
667                                   "bad cifs.upcall version. Expected %d got %d",
668                                   CIFS_SPNEGO_UPCALL_VERSION, msg->version);
669                         rc = -EKEYREJECTED;
670                         goto ssetup_exit;
671                 }
672                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
673                                                  GFP_KERNEL);
674                 if (!ses->auth_key.response) {
675                         cifs_dbg(VFS,
676                                 "Kerberos can't allocate (%u bytes) memory",
677                                 msg->sesskey_len);
678                         rc = -ENOMEM;
679                         goto ssetup_exit;
680                 }
681                 ses->auth_key.len = msg->sesskey_len;
682                 blob_length = msg->secblob_len;
683                 iov[1].iov_base = msg->data + msg->sesskey_len;
684                 iov[1].iov_len = blob_length;
685 #else
686                 rc = -EOPNOTSUPP;
687                 goto ssetup_exit;
688 #endif /* CONFIG_CIFS_UPCALL */
689         } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
690                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
691                                        GFP_KERNEL);
692                 if (ntlmssp_blob == NULL) {
693                         rc = -ENOMEM;
694                         goto ssetup_exit;
695                 }
696                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
697                 if (use_spnego) {
698                         /* blob_length = build_spnego_ntlmssp_blob(
699                                         &security_blob,
700                                         sizeof(struct _NEGOTIATE_MESSAGE),
701                                         ntlmssp_blob); */
702                         /* BB eventually need to add this */
703                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
704                         rc = -EOPNOTSUPP;
705                         kfree(ntlmssp_blob);
706                         goto ssetup_exit;
707                 } else {
708                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
709                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
710                         security_blob = ntlmssp_blob;
711                 }
712                 iov[1].iov_base = security_blob;
713                 iov[1].iov_len = blob_length;
714         } else if (phase == NtLmAuthenticate) {
715                 req->hdr.SessionId = ses->Suid;
716                 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
717                                              nls_cp);
718                 if (rc) {
719                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
720                                  rc);
721                         goto ssetup_exit; /* BB double check error handling */
722                 }
723                 if (use_spnego) {
724                         /* blob_length = build_spnego_ntlmssp_blob(
725                                                         &security_blob,
726                                                         blob_length,
727                                                         ntlmssp_blob); */
728                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
729                         rc = -EOPNOTSUPP;
730                         kfree(ntlmssp_blob);
731                         goto ssetup_exit;
732                 } else {
733                         security_blob = ntlmssp_blob;
734                 }
735                 iov[1].iov_base = security_blob;
736                 iov[1].iov_len = blob_length;
737         } else {
738                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
739                 rc = -EIO;
740                 goto ssetup_exit;
741         }
742 
743         /* Testing shows that buffer offset must be at location of Buffer[0] */
744         req->SecurityBufferOffset =
745                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
746                                             1 /* pad */ - 4 /* rfc1001 len */);
747         req->SecurityBufferLength = cpu_to_le16(blob_length);
748 
749         inc_rfc1001_len(req, blob_length - 1 /* pad */);
750 
751         /* BB add code to build os and lm fields */
752 
753         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
754                           CIFS_LOG_ERROR | CIFS_NEG_OP);
755 
756         kfree(security_blob);
757         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
758         ses->Suid = rsp->hdr.SessionId;
759         if (resp_buftype != CIFS_NO_BUFFER &&
760             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
761                 if (phase != NtLmNegotiate) {
762                         cifs_dbg(VFS, "Unexpected more processing error\n");
763                         goto ssetup_exit;
764                 }
765                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
766                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
767                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
768                                  le16_to_cpu(rsp->SecurityBufferOffset));
769                         rc = -EIO;
770                         goto ssetup_exit;
771                 }
772 
773                 /* NTLMSSP Negotiate sent now processing challenge (response) */
774                 phase = NtLmChallenge; /* process ntlmssp challenge */
775                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
776                 rc = decode_ntlmssp_challenge(rsp->Buffer,
777                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
778         }
779 
780         /*
781          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
782          * but at least the raw NTLMSSP case works.
783          */
784         /*
785          * No tcon so can't do
786          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
787          */
788         if (rc != 0)
789                 goto ssetup_exit;
790 
791         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
792         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
793                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
794 ssetup_exit:
795         free_rsp_buf(resp_buftype, rsp);
796 
797         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
798         if ((phase == NtLmChallenge) && (rc == 0))
799                 goto ssetup_ntlmssp_authenticate;
800 
801         if (!rc) {
802                 mutex_lock(&server->srv_mutex);
803                 if (server->sign && server->ops->generate_signingkey) {
804                         rc = server->ops->generate_signingkey(ses);
805                         kfree(ses->auth_key.response);
806                         ses->auth_key.response = NULL;
807                         if (rc) {
808                                 cifs_dbg(FYI,
809                                         "SMB3 session key generation failed\n");
810                                 mutex_unlock(&server->srv_mutex);
811                                 goto keygen_exit;
812                         }
813                 }
814                 if (!server->session_estab) {
815                         server->sequence_number = 0x2;
816                         server->session_estab = true;
817                 }
818                 mutex_unlock(&server->srv_mutex);
819 
820                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
821                 spin_lock(&GlobalMid_Lock);
822                 ses->status = CifsGood;
823                 ses->need_reconnect = false;
824                 spin_unlock(&GlobalMid_Lock);
825         }
826 
827 keygen_exit:
828         if (!server->sign) {
829                 kfree(ses->auth_key.response);
830                 ses->auth_key.response = NULL;
831         }
832         if (spnego_key) {
833                 key_invalidate(spnego_key);
834                 key_put(spnego_key);
835         }
836         kfree(ses->ntlmssp);
837 
838         return rc;
839 }
840 
841 int
842 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
843 {
844         struct smb2_logoff_req *req; /* response is also trivial struct */
845         int rc = 0;
846         struct TCP_Server_Info *server;
847 
848         cifs_dbg(FYI, "disconnect session %p\n", ses);
849 
850         if (ses && (ses->server))
851                 server = ses->server;
852         else
853                 return -EIO;
854 
855         /* no need to send SMB logoff if uid already closed due to reconnect */
856         if (ses->need_reconnect)
857                 goto smb2_session_already_dead;
858 
859         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
860         if (rc)
861                 return rc;
862 
863          /* since no tcon, smb2_init can not do this, so do here */
864         req->hdr.SessionId = ses->Suid;
865         if (server->sign)
866                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
867 
868         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
869         /*
870          * No tcon so can't do
871          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
872          */
873 
874 smb2_session_already_dead:
875         return rc;
876 }
877 
878 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
879 {
880         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
881 }
882 
883 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
884 
885 /* These are similar values to what Windows uses */
886 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
887 {
888         tcon->max_chunks = 256;
889         tcon->max_bytes_chunk = 1048576;
890         tcon->max_bytes_copy = 16777216;
891 }
892 
893 int
894 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
895           struct cifs_tcon *tcon, const struct nls_table *cp)
896 {
897         struct smb2_tree_connect_req *req;
898         struct smb2_tree_connect_rsp *rsp = NULL;
899         struct kvec iov[2];
900         int rc = 0;
901         int resp_buftype;
902         int unc_path_len;
903         struct TCP_Server_Info *server;
904         __le16 *unc_path = NULL;
905 
906         cifs_dbg(FYI, "TCON\n");
907 
908         if ((ses->server) && tree)
909                 server = ses->server;
910         else
911                 return -EIO;
912 
913         if (tcon && tcon->bad_network_name)
914                 return -ENOENT;
915 
916         if ((tcon && tcon->seal) &&
917             ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
918                 cifs_dbg(VFS, "encryption requested but no server support");
919                 return -EOPNOTSUPP;
920         }
921 
922         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
923         if (unc_path == NULL)
924                 return -ENOMEM;
925 
926         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
927         unc_path_len *= 2;
928         if (unc_path_len < 2) {
929                 kfree(unc_path);
930                 return -EINVAL;
931         }
932 
933         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
934         if (rc) {
935                 kfree(unc_path);
936                 return rc;
937         }
938 
939         if (tcon == NULL) {
940                 /* since no tcon, smb2_init can not do this, so do here */
941                 req->hdr.SessionId = ses->Suid;
942                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
943                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
944         }
945 
946         iov[0].iov_base = (char *)req;
947         /* 4 for rfc1002 length field and 1 for pad */
948         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
949 
950         /* Testing shows that buffer offset must be at location of Buffer[0] */
951         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
952                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
953         req->PathLength = cpu_to_le16(unc_path_len - 2);
954         iov[1].iov_base = unc_path;
955         iov[1].iov_len = unc_path_len;
956 
957         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
958 
959         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
960         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
961 
962         if (rc != 0) {
963                 if (tcon) {
964                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
965                         tcon->need_reconnect = true;
966                 }
967                 goto tcon_error_exit;
968         }
969 
970         if (tcon == NULL) {
971                 ses->ipc_tid = rsp->hdr.TreeId;
972                 goto tcon_exit;
973         }
974 
975         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
976                 cifs_dbg(FYI, "connection to disk share\n");
977         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
978                 tcon->ipc = true;
979                 cifs_dbg(FYI, "connection to pipe share\n");
980         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
981                 tcon->print = true;
982                 cifs_dbg(FYI, "connection to printer\n");
983         } else {
984                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
985                 rc = -EOPNOTSUPP;
986                 goto tcon_error_exit;
987         }
988 
989         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
990         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
991         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
992         tcon->tidStatus = CifsGood;
993         tcon->need_reconnect = false;
994         tcon->tid = rsp->hdr.TreeId;
995         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
996 
997         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
998             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
999                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1000         init_copy_chunk_defaults(tcon);
1001         if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1002                 cifs_dbg(VFS, "Encrypted shares not supported");
1003         if (tcon->ses->server->ops->validate_negotiate)
1004                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1005 tcon_exit:
1006         free_rsp_buf(resp_buftype, rsp);
1007         kfree(unc_path);
1008         return rc;
1009 
1010 tcon_error_exit:
1011         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1012                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1013                 if (tcon)
1014                         tcon->bad_network_name = true;
1015         }
1016         goto tcon_exit;
1017 }
1018 
1019 int
1020 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1021 {
1022         struct smb2_tree_disconnect_req *req; /* response is trivial */
1023         int rc = 0;
1024         struct TCP_Server_Info *server;
1025         struct cifs_ses *ses = tcon->ses;
1026 
1027         cifs_dbg(FYI, "Tree Disconnect\n");
1028 
1029         if (ses && (ses->server))
1030                 server = ses->server;
1031         else
1032                 return -EIO;
1033 
1034         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1035                 return 0;
1036 
1037         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1038         if (rc)
1039                 return rc;
1040 
1041         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1042         if (rc)
1043                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1044 
1045         return rc;
1046 }
1047 
1048 
1049 static struct create_durable *
1050 create_durable_buf(void)
1051 {
1052         struct create_durable *buf;
1053 
1054         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1055         if (!buf)
1056                 return NULL;
1057 
1058         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1059                                         (struct create_durable, Data));
1060         buf->ccontext.DataLength = cpu_to_le32(16);
1061         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1062                                 (struct create_durable, Name));
1063         buf->ccontext.NameLength = cpu_to_le16(4);
1064         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1065         buf->Name[0] = 'D';
1066         buf->Name[1] = 'H';
1067         buf->Name[2] = 'n';
1068         buf->Name[3] = 'Q';
1069         return buf;
1070 }
1071 
1072 static struct create_durable *
1073 create_reconnect_durable_buf(struct cifs_fid *fid)
1074 {
1075         struct create_durable *buf;
1076 
1077         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1078         if (!buf)
1079                 return NULL;
1080 
1081         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1082                                         (struct create_durable, Data));
1083         buf->ccontext.DataLength = cpu_to_le32(16);
1084         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1085                                 (struct create_durable, Name));
1086         buf->ccontext.NameLength = cpu_to_le16(4);
1087         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1088         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1089         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1090         buf->Name[0] = 'D';
1091         buf->Name[1] = 'H';
1092         buf->Name[2] = 'n';
1093         buf->Name[3] = 'C';
1094         return buf;
1095 }
1096 
1097 static __u8
1098 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1099                   unsigned int *epoch)
1100 {
1101         char *data_offset;
1102         struct create_context *cc;
1103         unsigned int next;
1104         unsigned int remaining;
1105         char *name;
1106 
1107         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1108         remaining = le32_to_cpu(rsp->CreateContextsLength);
1109         cc = (struct create_context *)data_offset;
1110         while (remaining >= sizeof(struct create_context)) {
1111                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1112                 if (le16_to_cpu(cc->NameLength) == 4 &&
1113                     strncmp(name, "RqLs", 4) == 0)
1114                         return server->ops->parse_lease_buf(cc, epoch);
1115 
1116                 next = le32_to_cpu(cc->Next);
1117                 if (!next)
1118                         break;
1119                 remaining -= next;
1120                 cc = (struct create_context *)((char *)cc + next);
1121         }
1122 
1123         return 0;
1124 }
1125 
1126 static int
1127 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1128                   unsigned int *num_iovec, __u8 *oplock)
1129 {
1130         struct smb2_create_req *req = iov[0].iov_base;
1131         unsigned int num = *num_iovec;
1132 
1133         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1134         if (iov[num].iov_base == NULL)
1135                 return -ENOMEM;
1136         iov[num].iov_len = server->vals->create_lease_size;
1137         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1138         if (!req->CreateContextsOffset)
1139                 req->CreateContextsOffset = cpu_to_le32(
1140                                 sizeof(struct smb2_create_req) - 4 +
1141                                 iov[num - 1].iov_len);
1142         le32_add_cpu(&req->CreateContextsLength,
1143                      server->vals->create_lease_size);
1144         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1145         *num_iovec = num + 1;
1146         return 0;
1147 }
1148 
1149 static struct create_durable_v2 *
1150 create_durable_v2_buf(struct cifs_fid *pfid)
1151 {
1152         struct create_durable_v2 *buf;
1153 
1154         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1155         if (!buf)
1156                 return NULL;
1157 
1158         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1159                                         (struct create_durable_v2, dcontext));
1160         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1161         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1162                                 (struct create_durable_v2, Name));
1163         buf->ccontext.NameLength = cpu_to_le16(4);
1164 
1165         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1166         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1167         get_random_bytes(buf->dcontext.CreateGuid, 16);
1168         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1169 
1170         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1171         buf->Name[0] = 'D';
1172         buf->Name[1] = 'H';
1173         buf->Name[2] = '2';
1174         buf->Name[3] = 'Q';
1175         return buf;
1176 }
1177 
1178 static struct create_durable_handle_reconnect_v2 *
1179 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1180 {
1181         struct create_durable_handle_reconnect_v2 *buf;
1182 
1183         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1184                         GFP_KERNEL);
1185         if (!buf)
1186                 return NULL;
1187 
1188         buf->ccontext.DataOffset =
1189                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1190                                      dcontext));
1191         buf->ccontext.DataLength =
1192                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1193         buf->ccontext.NameOffset =
1194                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1195                             Name));
1196         buf->ccontext.NameLength = cpu_to_le16(4);
1197 
1198         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1199         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1200         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1201         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1202 
1203         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1204         buf->Name[0] = 'D';
1205         buf->Name[1] = 'H';
1206         buf->Name[2] = '2';
1207         buf->Name[3] = 'C';
1208         return buf;
1209 }
1210 
1211 static int
1212 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1213                     struct cifs_open_parms *oparms)
1214 {
1215         struct smb2_create_req *req = iov[0].iov_base;
1216         unsigned int num = *num_iovec;
1217 
1218         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1219         if (iov[num].iov_base == NULL)
1220                 return -ENOMEM;
1221         iov[num].iov_len = sizeof(struct create_durable_v2);
1222         if (!req->CreateContextsOffset)
1223                 req->CreateContextsOffset =
1224                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1225                                                                 iov[1].iov_len);
1226         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1227         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1228         *num_iovec = num + 1;
1229         return 0;
1230 }
1231 
1232 static int
1233 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1234                     struct cifs_open_parms *oparms)
1235 {
1236         struct smb2_create_req *req = iov[0].iov_base;
1237         unsigned int num = *num_iovec;
1238 
1239         /* indicate that we don't need to relock the file */
1240         oparms->reconnect = false;
1241 
1242         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1243         if (iov[num].iov_base == NULL)
1244                 return -ENOMEM;
1245         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1246         if (!req->CreateContextsOffset)
1247                 req->CreateContextsOffset =
1248                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1249                                                                 iov[1].iov_len);
1250         le32_add_cpu(&req->CreateContextsLength,
1251                         sizeof(struct create_durable_handle_reconnect_v2));
1252         inc_rfc1001_len(&req->hdr,
1253                         sizeof(struct create_durable_handle_reconnect_v2));
1254         *num_iovec = num + 1;
1255         return 0;
1256 }
1257 
1258 static int
1259 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1260                     struct cifs_open_parms *oparms, bool use_persistent)
1261 {
1262         struct smb2_create_req *req = iov[0].iov_base;
1263         unsigned int num = *num_iovec;
1264 
1265         if (use_persistent) {
1266                 if (oparms->reconnect)
1267                         return add_durable_reconnect_v2_context(iov, num_iovec,
1268                                                                 oparms);
1269                 else
1270                         return add_durable_v2_context(iov, num_iovec, oparms);
1271         }
1272 
1273         if (oparms->reconnect) {
1274                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1275                 /* indicate that we don't need to relock the file */
1276                 oparms->reconnect = false;
1277         } else
1278                 iov[num].iov_base = create_durable_buf();
1279         if (iov[num].iov_base == NULL)
1280                 return -ENOMEM;
1281         iov[num].iov_len = sizeof(struct create_durable);
1282         if (!req->CreateContextsOffset)
1283                 req->CreateContextsOffset =
1284                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1285                                                                 iov[1].iov_len);
1286         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1287         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1288         *num_iovec = num + 1;
1289         return 0;
1290 }
1291 
1292 int
1293 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1294           __u8 *oplock, struct smb2_file_all_info *buf,
1295           struct smb2_err_rsp **err_buf)
1296 {
1297         struct smb2_create_req *req;
1298         struct smb2_create_rsp *rsp;
1299         struct TCP_Server_Info *server;
1300         struct cifs_tcon *tcon = oparms->tcon;
1301         struct cifs_ses *ses = tcon->ses;
1302         struct kvec iov[4];
1303         int resp_buftype;
1304         int uni_path_len;
1305         __le16 *copy_path = NULL;
1306         int copy_size;
1307         int rc = 0;
1308         unsigned int num_iovecs = 2;
1309         __u32 file_attributes = 0;
1310         char *dhc_buf = NULL, *lc_buf = NULL;
1311 
1312         cifs_dbg(FYI, "create/open\n");
1313 
1314         if (ses && (ses->server))
1315                 server = ses->server;
1316         else
1317                 return -EIO;
1318 
1319         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1320         if (rc)
1321                 return rc;
1322 
1323         if (oparms->create_options & CREATE_OPTION_READONLY)
1324                 file_attributes |= ATTR_READONLY;
1325         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1326                 file_attributes |= ATTR_SYSTEM;
1327 
1328         req->ImpersonationLevel = IL_IMPERSONATION;
1329         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1330         /* File attributes ignored on open (used in create though) */
1331         req->FileAttributes = cpu_to_le32(file_attributes);
1332         req->ShareAccess = FILE_SHARE_ALL_LE;
1333         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1334         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1335         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1336         /* do not count rfc1001 len field */
1337         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1338 
1339         iov[0].iov_base = (char *)req;
1340         /* 4 for rfc1002 length field */
1341         iov[0].iov_len = get_rfc1002_length(req) + 4;
1342 
1343         /* MUST set path len (NameLength) to 0 opening root of share */
1344         req->NameLength = cpu_to_le16(uni_path_len - 2);
1345         /* -1 since last byte is buf[0] which is sent below (path) */
1346         iov[0].iov_len--;
1347         if (uni_path_len % 8 != 0) {
1348                 copy_size = uni_path_len / 8 * 8;
1349                 if (copy_size < uni_path_len)
1350                         copy_size += 8;
1351 
1352                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1353                 if (!copy_path)
1354                         return -ENOMEM;
1355                 memcpy((char *)copy_path, (const char *)path,
1356                         uni_path_len);
1357                 uni_path_len = copy_size;
1358                 path = copy_path;
1359         }
1360 
1361         iov[1].iov_len = uni_path_len;
1362         iov[1].iov_base = path;
1363         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1364         inc_rfc1001_len(req, uni_path_len - 1);
1365 
1366         if (!server->oplocks)
1367                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1368 
1369         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1370             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1371                 req->RequestedOplockLevel = *oplock;
1372         else {
1373                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1374                 if (rc) {
1375                         cifs_small_buf_release(req);
1376                         kfree(copy_path);
1377                         return rc;
1378                 }
1379                 lc_buf = iov[num_iovecs-1].iov_base;
1380         }
1381 
1382         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1383                 /* need to set Next field of lease context if we request it */
1384                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1385                         struct create_context *ccontext =
1386                             (struct create_context *)iov[num_iovecs-1].iov_base;
1387                         ccontext->Next =
1388                                 cpu_to_le32(server->vals->create_lease_size);
1389                 }
1390 
1391                 rc = add_durable_context(iov, &num_iovecs, oparms,
1392                                         tcon->use_persistent);
1393                 if (rc) {
1394                         cifs_small_buf_release(req);
1395                         kfree(copy_path);
1396                         kfree(lc_buf);
1397                         return rc;
1398                 }
1399                 dhc_buf = iov[num_iovecs-1].iov_base;
1400         }
1401 
1402         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1403         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1404 
1405         if (rc != 0) {
1406                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1407                 if (err_buf)
1408                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1409                                            GFP_KERNEL);
1410                 goto creat_exit;
1411         }
1412 
1413         oparms->fid->persistent_fid = rsp->PersistentFileId;
1414         oparms->fid->volatile_fid = rsp->VolatileFileId;
1415 
1416         if (buf) {
1417                 memcpy(buf, &rsp->CreationTime, 32);
1418                 buf->AllocationSize = rsp->AllocationSize;
1419                 buf->EndOfFile = rsp->EndofFile;
1420                 buf->Attributes = rsp->FileAttributes;
1421                 buf->NumberOfLinks = cpu_to_le32(1);
1422                 buf->DeletePending = 0;
1423         }
1424 
1425         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1426                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1427         else
1428                 *oplock = rsp->OplockLevel;
1429 creat_exit:
1430         kfree(copy_path);
1431         kfree(lc_buf);
1432         kfree(dhc_buf);
1433         free_rsp_buf(resp_buftype, rsp);
1434         return rc;
1435 }
1436 
1437 /*
1438  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1439  */
1440 int
1441 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1442            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1443            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1444 {
1445         struct smb2_ioctl_req *req;
1446         struct smb2_ioctl_rsp *rsp;
1447         struct TCP_Server_Info *server;
1448         struct cifs_ses *ses;
1449         struct kvec iov[2];
1450         int resp_buftype;
1451         int num_iovecs;
1452         int rc = 0;
1453 
1454         cifs_dbg(FYI, "SMB2 IOCTL\n");
1455 
1456         if (out_data != NULL)
1457                 *out_data = NULL;
1458 
1459         /* zero out returned data len, in case of error */
1460         if (plen)
1461                 *plen = 0;
1462 
1463         if (tcon)
1464                 ses = tcon->ses;
1465         else
1466                 return -EIO;
1467 
1468         if (ses && (ses->server))
1469                 server = ses->server;
1470         else
1471                 return -EIO;
1472 
1473         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1474         if (rc)
1475                 return rc;
1476 
1477         req->CtlCode = cpu_to_le32(opcode);
1478         req->PersistentFileId = persistent_fid;
1479         req->VolatileFileId = volatile_fid;
1480 
1481         if (indatalen) {
1482                 req->InputCount = cpu_to_le32(indatalen);
1483                 /* do not set InputOffset if no input data */
1484                 req->InputOffset =
1485                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1486                 iov[1].iov_base = in_data;
1487                 iov[1].iov_len = indatalen;
1488                 num_iovecs = 2;
1489         } else
1490                 num_iovecs = 1;
1491 
1492         req->OutputOffset = 0;
1493         req->OutputCount = 0; /* MBZ */
1494 
1495         /*
1496          * Could increase MaxOutputResponse, but that would require more
1497          * than one credit. Windows typically sets this smaller, but for some
1498          * ioctls it may be useful to allow server to send more. No point
1499          * limiting what the server can send as long as fits in one credit
1500          */
1501         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1502 
1503         if (is_fsctl)
1504                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1505         else
1506                 req->Flags = 0;
1507 
1508         iov[0].iov_base = (char *)req;
1509 
1510         /*
1511          * If no input data, the size of ioctl struct in
1512          * protocol spec still includes a 1 byte data buffer,
1513          * but if input data passed to ioctl, we do not
1514          * want to double count this, so we do not send
1515          * the dummy one byte of data in iovec[0] if sending
1516          * input data (in iovec[1]). We also must add 4 bytes
1517          * in first iovec to allow for rfc1002 length field.
1518          */
1519 
1520         if (indatalen) {
1521                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1522                 inc_rfc1001_len(req, indatalen - 1);
1523         } else
1524                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1525 
1526 
1527         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1528         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1529 
1530         if ((rc != 0) && (rc != -EINVAL)) {
1531                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1532                 goto ioctl_exit;
1533         } else if (rc == -EINVAL) {
1534                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1535                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1536                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1537                         goto ioctl_exit;
1538                 }
1539         }
1540 
1541         /* check if caller wants to look at return data or just return rc */
1542         if ((plen == NULL) || (out_data == NULL))
1543                 goto ioctl_exit;
1544 
1545         *plen = le32_to_cpu(rsp->OutputCount);
1546 
1547         /* We check for obvious errors in the output buffer length and offset */
1548         if (*plen == 0)
1549                 goto ioctl_exit; /* server returned no data */
1550         else if (*plen > 0xFF00) {
1551                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1552                 *plen = 0;
1553                 rc = -EIO;
1554                 goto ioctl_exit;
1555         }
1556 
1557         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1558                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1559                         le32_to_cpu(rsp->OutputOffset));
1560                 *plen = 0;
1561                 rc = -EIO;
1562                 goto ioctl_exit;
1563         }
1564 
1565         *out_data = kmalloc(*plen, GFP_KERNEL);
1566         if (*out_data == NULL) {
1567                 rc = -ENOMEM;
1568                 goto ioctl_exit;
1569         }
1570 
1571         memcpy(*out_data,
1572                (char *)&rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1573                *plen);
1574 ioctl_exit:
1575         free_rsp_buf(resp_buftype, rsp);
1576         return rc;
1577 }
1578 
1579 /*
1580  *   Individual callers to ioctl worker function follow
1581  */
1582 
1583 int
1584 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1585                      u64 persistent_fid, u64 volatile_fid)
1586 {
1587         int rc;
1588         struct  compress_ioctl fsctl_input;
1589         char *ret_data = NULL;
1590 
1591         fsctl_input.CompressionState =
1592                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1593 
1594         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1595                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1596                         (char *)&fsctl_input /* data input */,
1597                         2 /* in data len */, &ret_data /* out data */, NULL);
1598 
1599         cifs_dbg(FYI, "set compression rc %d\n", rc);
1600 
1601         return rc;
1602 }
1603 
1604 int
1605 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1606            u64 persistent_fid, u64 volatile_fid)
1607 {
1608         struct smb2_close_req *req;
1609         struct smb2_close_rsp *rsp;
1610         struct TCP_Server_Info *server;
1611         struct cifs_ses *ses = tcon->ses;
1612         struct kvec iov[1];
1613         int resp_buftype;
1614         int rc = 0;
1615 
1616         cifs_dbg(FYI, "Close\n");
1617 
1618         if (ses && (ses->server))
1619                 server = ses->server;
1620         else
1621                 return -EIO;
1622 
1623         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1624         if (rc)
1625                 return rc;
1626 
1627         req->PersistentFileId = persistent_fid;
1628         req->VolatileFileId = volatile_fid;
1629 
1630         iov[0].iov_base = (char *)req;
1631         /* 4 for rfc1002 length field */
1632         iov[0].iov_len = get_rfc1002_length(req) + 4;
1633 
1634         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1635         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1636 
1637         if (rc != 0) {
1638                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1639                 goto close_exit;
1640         }
1641 
1642         /* BB FIXME - decode close response, update inode for caching */
1643 
1644 close_exit:
1645         free_rsp_buf(resp_buftype, rsp);
1646         return rc;
1647 }
1648 
1649 static int
1650 validate_buf(unsigned int offset, unsigned int buffer_length,
1651              struct smb2_hdr *hdr, unsigned int min_buf_size)
1652 
1653 {
1654         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1655         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1656         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1657         char *end_of_buf = begin_of_buf + buffer_length;
1658 
1659 
1660         if (buffer_length < min_buf_size) {
1661                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1662                          buffer_length, min_buf_size);
1663                 return -EINVAL;
1664         }
1665 
1666         /* check if beyond RFC1001 maximum length */
1667         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1668                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1669                          buffer_length, smb_len);
1670                 return -EINVAL;
1671         }
1672 
1673         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1674                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1675                 return -EINVAL;
1676         }
1677 
1678         return 0;
1679 }
1680 
1681 /*
1682  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1683  * Caller must free buffer.
1684  */
1685 static int
1686 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1687                       struct smb2_hdr *hdr, unsigned int minbufsize,
1688                       char *data)
1689 
1690 {
1691         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1692         int rc;
1693 
1694         if (!data)
1695                 return -EINVAL;
1696 
1697         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1698         if (rc)
1699                 return rc;
1700 
1701         memcpy(data, begin_of_buf, buffer_length);
1702 
1703         return 0;
1704 }
1705 
1706 static int
1707 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1708            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1709            size_t output_len, size_t min_len, void *data)
1710 {
1711         struct smb2_query_info_req *req;
1712         struct smb2_query_info_rsp *rsp = NULL;
1713         struct kvec iov[2];
1714         int rc = 0;
1715         int resp_buftype;
1716         struct TCP_Server_Info *server;
1717         struct cifs_ses *ses = tcon->ses;
1718 
1719         cifs_dbg(FYI, "Query Info\n");
1720 
1721         if (ses && (ses->server))
1722                 server = ses->server;
1723         else
1724                 return -EIO;
1725 
1726         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1727         if (rc)
1728                 return rc;
1729 
1730         req->InfoType = SMB2_O_INFO_FILE;
1731         req->FileInfoClass = info_class;
1732         req->PersistentFileId = persistent_fid;
1733         req->VolatileFileId = volatile_fid;
1734         /* 4 for rfc1002 length field and 1 for Buffer */
1735         req->InputBufferOffset =
1736                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1737         req->OutputBufferLength = cpu_to_le32(output_len);
1738 
1739         iov[0].iov_base = (char *)req;
1740         /* 4 for rfc1002 length field */
1741         iov[0].iov_len = get_rfc1002_length(req) + 4;
1742 
1743         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1744         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1745 
1746         if (rc) {
1747                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1748                 goto qinf_exit;
1749         }
1750 
1751         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1752                                    le32_to_cpu(rsp->OutputBufferLength),
1753                                    &rsp->hdr, min_len, data);
1754 
1755 qinf_exit:
1756         free_rsp_buf(resp_buftype, rsp);
1757         return rc;
1758 }
1759 
1760 int
1761 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1762                 u64 persistent_fid, u64 volatile_fid,
1763                 struct smb2_file_all_info *data)
1764 {
1765         return query_info(xid, tcon, persistent_fid, volatile_fid,
1766                           FILE_ALL_INFORMATION,
1767                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1768                           sizeof(struct smb2_file_all_info), data);
1769 }
1770 
1771 int
1772 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1773                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1774 {
1775         return query_info(xid, tcon, persistent_fid, volatile_fid,
1776                           FILE_INTERNAL_INFORMATION,
1777                           sizeof(struct smb2_file_internal_info),
1778                           sizeof(struct smb2_file_internal_info), uniqueid);
1779 }
1780 
1781 /*
1782  * This is a no-op for now. We're not really interested in the reply, but
1783  * rather in the fact that the server sent one and that server->lstrp
1784  * gets updated.
1785  *
1786  * FIXME: maybe we should consider checking that the reply matches request?
1787  */
1788 static void
1789 smb2_echo_callback(struct mid_q_entry *mid)
1790 {
1791         struct TCP_Server_Info *server = mid->callback_data;
1792         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1793         unsigned int credits_received = 1;
1794 
1795         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1796                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1797 
1798         mutex_lock(&server->srv_mutex);
1799         DeleteMidQEntry(mid);
1800         mutex_unlock(&server->srv_mutex);
1801         add_credits(server, credits_received, CIFS_ECHO_OP);
1802 }
1803 
1804 int
1805 SMB2_echo(struct TCP_Server_Info *server)
1806 {
1807         struct smb2_echo_req *req;
1808         int rc = 0;
1809         struct kvec iov;
1810         struct smb_rqst rqst = { .rq_iov = &iov,
1811                                  .rq_nvec = 1 };
1812 
1813         cifs_dbg(FYI, "In echo request\n");
1814 
1815         if (server->tcpStatus == CifsNeedNegotiate) {
1816                 struct list_head *tmp, *tmp2;
1817                 struct cifs_ses *ses;
1818                 struct cifs_tcon *tcon;
1819 
1820                 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
1821                 spin_lock(&cifs_tcp_ses_lock);
1822                 list_for_each(tmp, &server->smb_ses_list) {
1823                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
1824                         list_for_each(tmp2, &ses->tcon_list) {
1825                                 tcon = list_entry(tmp2, struct cifs_tcon,
1826                                                   tcon_list);
1827                                 /* add check for persistent handle reconnect */
1828                                 if (tcon && tcon->need_reconnect) {
1829                                         spin_unlock(&cifs_tcp_ses_lock);
1830                                         rc = smb2_reconnect(SMB2_ECHO, tcon);
1831                                         spin_lock(&cifs_tcp_ses_lock);
1832                                 }
1833                         }
1834                 }
1835                 spin_unlock(&cifs_tcp_ses_lock);
1836         }
1837 
1838         /* if no session, renegotiate failed above */
1839         if (server->tcpStatus == CifsNeedNegotiate)
1840                 return -EIO;
1841 
1842         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1843         if (rc)
1844                 return rc;
1845 
1846         req->hdr.CreditRequest = cpu_to_le16(1);
1847 
1848         iov.iov_base = (char *)req;
1849         /* 4 for rfc1002 length field */
1850         iov.iov_len = get_rfc1002_length(req) + 4;
1851 
1852         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1853                              CIFS_ECHO_OP);
1854         if (rc)
1855                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1856 
1857         cifs_small_buf_release(req);
1858         return rc;
1859 }
1860 
1861 int
1862 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1863            u64 volatile_fid)
1864 {
1865         struct smb2_flush_req *req;
1866         struct TCP_Server_Info *server;
1867         struct cifs_ses *ses = tcon->ses;
1868         struct kvec iov[1];
1869         int resp_buftype;
1870         int rc = 0;
1871 
1872         cifs_dbg(FYI, "Flush\n");
1873 
1874         if (ses && (ses->server))
1875                 server = ses->server;
1876         else
1877                 return -EIO;
1878 
1879         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1880         if (rc)
1881                 return rc;
1882 
1883         req->PersistentFileId = persistent_fid;
1884         req->VolatileFileId = volatile_fid;
1885 
1886         iov[0].iov_base = (char *)req;
1887         /* 4 for rfc1002 length field */
1888         iov[0].iov_len = get_rfc1002_length(req) + 4;
1889 
1890         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1891 
1892         if (rc != 0)
1893                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1894 
1895         free_rsp_buf(resp_buftype, iov[0].iov_base);
1896         return rc;
1897 }
1898 
1899 /*
1900  * To form a chain of read requests, any read requests after the first should
1901  * have the end_of_chain boolean set to true.
1902  */
1903 static int
1904 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1905                   unsigned int remaining_bytes, int request_type)
1906 {
1907         int rc = -EACCES;
1908         struct smb2_read_req *req = NULL;
1909 
1910         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1911         if (rc)
1912                 return rc;
1913         if (io_parms->tcon->ses->server == NULL)
1914                 return -ECONNABORTED;
1915 
1916         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1917 
1918         req->PersistentFileId = io_parms->persistent_fid;
1919         req->VolatileFileId = io_parms->volatile_fid;
1920         req->ReadChannelInfoOffset = 0; /* reserved */
1921         req->ReadChannelInfoLength = 0; /* reserved */
1922         req->Channel = 0; /* reserved */
1923         req->MinimumCount = 0;
1924         req->Length = cpu_to_le32(io_parms->length);
1925         req->Offset = cpu_to_le64(io_parms->offset);
1926 
1927         if (request_type & CHAINED_REQUEST) {
1928                 if (!(request_type & END_OF_CHAIN)) {
1929                         /* 4 for rfc1002 length field */
1930                         req->hdr.NextCommand =
1931                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1932                 } else /* END_OF_CHAIN */
1933                         req->hdr.NextCommand = 0;
1934                 if (request_type & RELATED_REQUEST) {
1935                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1936                         /*
1937                          * Related requests use info from previous read request
1938                          * in chain.
1939                          */
1940                         req->hdr.SessionId = 0xFFFFFFFF;
1941                         req->hdr.TreeId = 0xFFFFFFFF;
1942                         req->PersistentFileId = 0xFFFFFFFF;
1943                         req->VolatileFileId = 0xFFFFFFFF;
1944                 }
1945         }
1946         if (remaining_bytes > io_parms->length)
1947                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1948         else
1949                 req->RemainingBytes = 0;
1950 
1951         iov[0].iov_base = (char *)req;
1952         /* 4 for rfc1002 length field */
1953         iov[0].iov_len = get_rfc1002_length(req) + 4;
1954         return rc;
1955 }
1956 
1957 static void
1958 smb2_readv_callback(struct mid_q_entry *mid)
1959 {
1960         struct cifs_readdata *rdata = mid->callback_data;
1961         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1962         struct TCP_Server_Info *server = tcon->ses->server;
1963         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1964         unsigned int credits_received = 1;
1965         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1966                                  .rq_nvec = 1,
1967                                  .rq_pages = rdata->pages,
1968                                  .rq_npages = rdata->nr_pages,
1969                                  .rq_pagesz = rdata->pagesz,
1970                                  .rq_tailsz = rdata->tailsz };
1971 
1972         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1973                  __func__, mid->mid, mid->mid_state, rdata->result,
1974                  rdata->bytes);
1975 
1976         switch (mid->mid_state) {
1977         case MID_RESPONSE_RECEIVED:
1978                 credits_received = le16_to_cpu(buf->CreditRequest);
1979                 /* result already set, check signature */
1980                 if (server->sign) {
1981                         int rc;
1982 
1983                         rc = smb2_verify_signature(&rqst, server);
1984                         if (rc)
1985                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1986                                          rc);
1987                 }
1988                 /* FIXME: should this be counted toward the initiating task? */
1989                 task_io_account_read(rdata->got_bytes);
1990                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1991                 break;
1992         case MID_REQUEST_SUBMITTED:
1993         case MID_RETRY_NEEDED:
1994                 rdata->result = -EAGAIN;
1995                 if (server->sign && rdata->got_bytes)
1996                         /* reset bytes number since we can not check a sign */
1997                         rdata->got_bytes = 0;
1998                 /* FIXME: should this be counted toward the initiating task? */
1999                 task_io_account_read(rdata->got_bytes);
2000                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2001                 break;
2002         default:
2003                 if (rdata->result != -ENODATA)
2004                         rdata->result = -EIO;
2005         }
2006 
2007         if (rdata->result)
2008                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2009 
2010         queue_work(cifsiod_wq, &rdata->work);
2011         mutex_lock(&server->srv_mutex);
2012         DeleteMidQEntry(mid);
2013         mutex_unlock(&server->srv_mutex);
2014         add_credits(server, credits_received, 0);
2015 }
2016 
2017 /* smb2_async_readv - send an async write, and set up mid to handle result */
2018 int
2019 smb2_async_readv(struct cifs_readdata *rdata)
2020 {
2021         int rc, flags = 0;
2022         struct smb2_hdr *buf;
2023         struct cifs_io_parms io_parms;
2024         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2025                                  .rq_nvec = 1 };
2026         struct TCP_Server_Info *server;
2027 
2028         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2029                  __func__, rdata->offset, rdata->bytes);
2030 
2031         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2032         io_parms.offset = rdata->offset;
2033         io_parms.length = rdata->bytes;
2034         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2035         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2036         io_parms.pid = rdata->pid;
2037 
2038         server = io_parms.tcon->ses->server;
2039 
2040         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2041         if (rc) {
2042                 if (rc == -EAGAIN && rdata->credits) {
2043                         /* credits was reset by reconnect */
2044                         rdata->credits = 0;
2045                         /* reduce in_flight value since we won't send the req */
2046                         spin_lock(&server->req_lock);
2047                         server->in_flight--;
2048                         spin_unlock(&server->req_lock);
2049                 }
2050                 return rc;
2051         }
2052 
2053         buf = (struct smb2_hdr *)rdata->iov.iov_base;
2054         /* 4 for rfc1002 length field */
2055         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2056 
2057         if (rdata->credits) {
2058                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2059                                                 SMB2_MAX_BUFFER_SIZE));
2060                 spin_lock(&server->req_lock);
2061                 server->credits += rdata->credits -
2062                                                 le16_to_cpu(buf->CreditCharge);
2063                 spin_unlock(&server->req_lock);
2064                 wake_up(&server->request_q);
2065                 flags = CIFS_HAS_CREDITS;
2066         }
2067 
2068         kref_get(&rdata->refcount);
2069         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2070                              cifs_readv_receive, smb2_readv_callback,
2071                              rdata, flags);
2072         if (rc) {
2073                 kref_put(&rdata->refcount, cifs_readdata_release);
2074                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2075         }
2076 
2077         cifs_small_buf_release(buf);
2078         return rc;
2079 }
2080 
2081 int
2082 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2083           unsigned int *nbytes, char **buf, int *buf_type)
2084 {
2085         int resp_buftype, rc = -EACCES;
2086         struct smb2_read_rsp *rsp = NULL;
2087         struct kvec iov[1];
2088 
2089         *nbytes = 0;
2090         rc = smb2_new_read_req(iov, io_parms, 0, 0);
2091         if (rc)
2092                 return rc;
2093 
2094         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2095                           &resp_buftype, CIFS_LOG_ERROR);
2096 
2097         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2098 
2099         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2100                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2101                 return 0;
2102         }
2103 
2104         if (rc) {
2105                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2106                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2107         } else {
2108                 *nbytes = le32_to_cpu(rsp->DataLength);
2109                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2110                     (*nbytes > io_parms->length)) {
2111                         cifs_dbg(FYI, "bad length %d for count %d\n",
2112                                  *nbytes, io_parms->length);
2113                         rc = -EIO;
2114                         *nbytes = 0;
2115                 }
2116         }
2117 
2118         if (*buf) {
2119                 memcpy(*buf, (char *)&rsp->hdr.ProtocolId + rsp->DataOffset,
2120                        *nbytes);
2121                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2122         } else if (resp_buftype != CIFS_NO_BUFFER) {
2123                 *buf = iov[0].iov_base;
2124                 if (resp_buftype == CIFS_SMALL_BUFFER)
2125                         *buf_type = CIFS_SMALL_BUFFER;
2126                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2127                         *buf_type = CIFS_LARGE_BUFFER;
2128         }
2129         return rc;
2130 }
2131 
2132 /*
2133  * Check the mid_state and signature on received buffer (if any), and queue the
2134  * workqueue completion task.
2135  */
2136 static void
2137 smb2_writev_callback(struct mid_q_entry *mid)
2138 {
2139         struct cifs_writedata *wdata = mid->callback_data;
2140         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2141         struct TCP_Server_Info *server = tcon->ses->server;
2142         unsigned int written;
2143         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2144         unsigned int credits_received = 1;
2145 
2146         switch (mid->mid_state) {
2147         case MID_RESPONSE_RECEIVED:
2148                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2149                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2150                 if (wdata->result != 0)
2151                         break;
2152 
2153                 written = le32_to_cpu(rsp->DataLength);
2154                 /*
2155                  * Mask off high 16 bits when bytes written as returned
2156                  * by the server is greater than bytes requested by the
2157                  * client. OS/2 servers are known to set incorrect
2158                  * CountHigh values.
2159                  */
2160                 if (written > wdata->bytes)
2161                         written &= 0xFFFF;
2162 
2163                 if (written < wdata->bytes)
2164                         wdata->result = -ENOSPC;
2165                 else
2166                         wdata->bytes = written;
2167                 break;
2168         case MID_REQUEST_SUBMITTED:
2169         case MID_RETRY_NEEDED:
2170                 wdata->result = -EAGAIN;
2171                 break;
2172         default:
2173                 wdata->result = -EIO;
2174                 break;
2175         }
2176 
2177         if (wdata->result)
2178                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2179 
2180         queue_work(cifsiod_wq, &wdata->work);
2181         mutex_lock(&server->srv_mutex);
2182         DeleteMidQEntry(mid);
2183         mutex_unlock(&server->srv_mutex);
2184         add_credits(tcon->ses->server, credits_received, 0);
2185 }
2186 
2187 /* smb2_async_writev - send an async write, and set up mid to handle result */
2188 int
2189 smb2_async_writev(struct cifs_writedata *wdata,
2190                   void (*release)(struct kref *kref))
2191 {
2192         int rc = -EACCES, flags = 0;
2193         struct smb2_write_req *req = NULL;
2194         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2195         struct TCP_Server_Info *server = tcon->ses->server;
2196         struct kvec iov;
2197         struct smb_rqst rqst;
2198 
2199         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2200         if (rc) {
2201                 if (rc == -EAGAIN && wdata->credits) {
2202                         /* credits was reset by reconnect */
2203                         wdata->credits = 0;
2204                         /* reduce in_flight value since we won't send the req */
2205                         spin_lock(&server->req_lock);
2206                         server->in_flight--;
2207                         spin_unlock(&server->req_lock);
2208                 }
2209                 goto async_writev_out;
2210         }
2211 
2212         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2213 
2214         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2215         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2216         req->WriteChannelInfoOffset = 0;
2217         req->WriteChannelInfoLength = 0;
2218         req->Channel = 0;
2219         req->Offset = cpu_to_le64(wdata->offset);
2220         /* 4 for rfc1002 length field */
2221         req->DataOffset = cpu_to_le16(
2222                                 offsetof(struct smb2_write_req, Buffer) - 4);
2223         req->RemainingBytes = 0;
2224 
2225         /* 4 for rfc1002 length field and 1 for Buffer */
2226         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2227         iov.iov_base = req;
2228 
2229         rqst.rq_iov = &iov;
2230         rqst.rq_nvec = 1;
2231         rqst.rq_pages = wdata->pages;
2232         rqst.rq_npages = wdata->nr_pages;
2233         rqst.rq_pagesz = wdata->pagesz;
2234         rqst.rq_tailsz = wdata->tailsz;
2235 
2236         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2237                  wdata->offset, wdata->bytes);
2238 
2239         req->Length = cpu_to_le32(wdata->bytes);
2240 
2241         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2242 
2243         if (wdata->credits) {
2244                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2245                                                     SMB2_MAX_BUFFER_SIZE));
2246                 spin_lock(&server->req_lock);
2247                 server->credits += wdata->credits -
2248                                         le16_to_cpu(req->hdr.CreditCharge);
2249                 spin_unlock(&server->req_lock);
2250                 wake_up(&server->request_q);
2251                 flags = CIFS_HAS_CREDITS;
2252         }
2253 
2254         kref_get(&wdata->refcount);
2255         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2256                              flags);
2257 
2258         if (rc) {
2259                 kref_put(&wdata->refcount, release);
2260                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2261         }
2262 
2263 async_writev_out:
2264         cifs_small_buf_release(req);
2265         return rc;
2266 }
2267 
2268 /*
2269  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2270  * The length field from io_parms must be at least 1 and indicates a number of
2271  * elements with data to write that begins with position 1 in iov array. All
2272  * data length is specified by count.
2273  */
2274 int
2275 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2276            unsigned int *nbytes, struct kvec *iov, int n_vec)
2277 {
2278         int rc = 0;
2279         struct smb2_write_req *req = NULL;
2280         struct smb2_write_rsp *rsp = NULL;
2281         int resp_buftype;
2282         *nbytes = 0;
2283 
2284         if (n_vec < 1)
2285                 return rc;
2286 
2287         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2288         if (rc)
2289                 return rc;
2290 
2291         if (io_parms->tcon->ses->server == NULL)
2292                 return -ECONNABORTED;
2293 
2294         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2295 
2296         req->PersistentFileId = io_parms->persistent_fid;
2297         req->VolatileFileId = io_parms->volatile_fid;
2298         req->WriteChannelInfoOffset = 0;
2299         req->WriteChannelInfoLength = 0;
2300         req->Channel = 0;
2301         req->Length = cpu_to_le32(io_parms->length);
2302         req->Offset = cpu_to_le64(io_parms->offset);
2303         /* 4 for rfc1002 length field */
2304         req->DataOffset = cpu_to_le16(
2305                                 offsetof(struct smb2_write_req, Buffer) - 4);
2306         req->RemainingBytes = 0;
2307 
2308         iov[0].iov_base = (char *)req;
2309         /* 4 for rfc1002 length field and 1 for Buffer */
2310         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2311 
2312         /* length of entire message including data to be written */
2313         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2314 
2315         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2316                           &resp_buftype, 0);
2317         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2318 
2319         if (rc) {
2320                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2321                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2322         } else
2323                 *nbytes = le32_to_cpu(rsp->DataLength);
2324 
2325         free_rsp_buf(resp_buftype, rsp);
2326         return rc;
2327 }
2328 
2329 static unsigned int
2330 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2331 {
2332         int len;
2333         unsigned int entrycount = 0;
2334         unsigned int next_offset = 0;
2335         FILE_DIRECTORY_INFO *entryptr;
2336 
2337         if (bufstart == NULL)
2338                 return 0;
2339 
2340         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2341 
2342         while (1) {
2343                 entryptr = (FILE_DIRECTORY_INFO *)
2344                                         ((char *)entryptr + next_offset);
2345 
2346                 if ((char *)entryptr + size > end_of_buf) {
2347                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2348                         break;
2349                 }
2350 
2351                 len = le32_to_cpu(entryptr->FileNameLength);
2352                 if ((char *)entryptr + len + size > end_of_buf) {
2353                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2354                                  end_of_buf);
2355                         break;
2356                 }
2357 
2358                 *lastentry = (char *)entryptr;
2359                 entrycount++;
2360 
2361                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2362                 if (!next_offset)
2363                         break;
2364         }
2365 
2366         return entrycount;
2367 }
2368 
2369 /*
2370  * Readdir/FindFirst
2371  */
2372 int
2373 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2374                      u64 persistent_fid, u64 volatile_fid, int index,
2375                      struct cifs_search_info *srch_inf)
2376 {
2377         struct smb2_query_directory_req *req;
2378         struct smb2_query_directory_rsp *rsp = NULL;
2379         struct kvec iov[2];
2380         int rc = 0;
2381         int len;
2382         int resp_buftype = CIFS_NO_BUFFER;
2383         unsigned char *bufptr;
2384         struct TCP_Server_Info *server;
2385         struct cifs_ses *ses = tcon->ses;
2386         __le16 asteriks = cpu_to_le16('*');
2387         char *end_of_smb;
2388         unsigned int output_size = CIFSMaxBufSize;
2389         size_t info_buf_size;
2390 
2391         if (ses && (ses->server))
2392                 server = ses->server;
2393         else
2394                 return -EIO;
2395 
2396         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2397         if (rc)
2398                 return rc;
2399 
2400         switch (srch_inf->info_level) {
2401         case SMB_FIND_FILE_DIRECTORY_INFO:
2402                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2403                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2404                 break;
2405         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2406                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2407                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2408                 break;
2409         default:
2410                 cifs_dbg(VFS, "info level %u isn't supported\n",
2411                          srch_inf->info_level);
2412                 rc = -EINVAL;
2413                 goto qdir_exit;
2414         }
2415 
2416         req->FileIndex = cpu_to_le32(index);
2417         req->PersistentFileId = persistent_fid;
2418         req->VolatileFileId = volatile_fid;
2419 
2420         len = 0x2;
2421         bufptr = req->Buffer;
2422         memcpy(bufptr, &asteriks, len);
2423 
2424         req->FileNameOffset =
2425                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2426         req->FileNameLength = cpu_to_le16(len);
2427         /*
2428          * BB could be 30 bytes or so longer if we used SMB2 specific
2429          * buffer lengths, but this is safe and close enough.
2430          */
2431         output_size = min_t(unsigned int, output_size, server->maxBuf);
2432         output_size = min_t(unsigned int, output_size, 2 << 15);
2433         req->OutputBufferLength = cpu_to_le32(output_size);
2434 
2435         iov[0].iov_base = (char *)req;
2436         /* 4 for RFC1001 length and 1 for Buffer */
2437         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2438 
2439         iov[1].iov_base = (char *)(req->Buffer);
2440         iov[1].iov_len = len;
2441 
2442         inc_rfc1001_len(req, len - 1 /* Buffer */);
2443 
2444         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2445         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2446 
2447         if (rc) {
2448                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2449                         srch_inf->endOfSearch = true;
2450                         rc = 0;
2451                 }
2452                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2453                 goto qdir_exit;
2454         }
2455 
2456         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2457                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2458                           info_buf_size);
2459         if (rc)
2460                 goto qdir_exit;
2461 
2462         srch_inf->unicode = true;
2463 
2464         if (srch_inf->ntwrk_buf_start) {
2465                 if (srch_inf->smallBuf)
2466                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2467                 else
2468                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2469         }
2470         srch_inf->ntwrk_buf_start = (char *)rsp;
2471         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2472                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2473         /* 4 for rfc1002 length field */
2474         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2475         srch_inf->entries_in_buffer =
2476                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2477                                     &srch_inf->last_entry, info_buf_size);
2478         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2479         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2480                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2481                  srch_inf->srch_entries_start, srch_inf->last_entry);
2482         if (resp_buftype == CIFS_LARGE_BUFFER)
2483                 srch_inf->smallBuf = false;
2484         else if (resp_buftype == CIFS_SMALL_BUFFER)
2485                 srch_inf->smallBuf = true;
2486         else
2487                 cifs_dbg(VFS, "illegal search buffer type\n");
2488 
2489         return rc;
2490 
2491 qdir_exit:
2492         free_rsp_buf(resp_buftype, rsp);
2493         return rc;
2494 }
2495 
2496 static int
2497 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2498                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2499                unsigned int num, void **data, unsigned int *size)
2500 {
2501         struct smb2_set_info_req *req;
2502         struct smb2_set_info_rsp *rsp = NULL;
2503         struct kvec *iov;
2504         int rc = 0;
2505         int resp_buftype;
2506         unsigned int i;
2507         struct TCP_Server_Info *server;
2508         struct cifs_ses *ses = tcon->ses;
2509 
2510         if (ses && (ses->server))
2511                 server = ses->server;
2512         else
2513                 return -EIO;
2514 
2515         if (!num)
2516                 return -EINVAL;
2517 
2518         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2519         if (!iov)
2520                 return -ENOMEM;
2521 
2522         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2523         if (rc) {
2524                 kfree(iov);
2525                 return rc;
2526         }
2527 
2528         req->hdr.ProcessId = cpu_to_le32(pid);
2529 
2530         req->InfoType = SMB2_O_INFO_FILE;
2531         req->FileInfoClass = info_class;
2532         req->PersistentFileId = persistent_fid;
2533         req->VolatileFileId = volatile_fid;
2534 
2535         /* 4 for RFC1001 length and 1 for Buffer */
2536         req->BufferOffset =
2537                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2538         req->BufferLength = cpu_to_le32(*size);
2539 
2540         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2541 
2542         memcpy(req->Buffer, *data, *size);
2543 
2544         iov[0].iov_base = (char *)req;
2545         /* 4 for RFC1001 length */
2546         iov[0].iov_len = get_rfc1002_length(req) + 4;
2547 
2548         for (i = 1; i < num; i++) {
2549                 inc_rfc1001_len(req, size[i]);
2550                 le32_add_cpu(&req->BufferLength, size[i]);
2551                 iov[i].iov_base = (char *)data[i];
2552                 iov[i].iov_len = size[i];
2553         }
2554 
2555         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2556         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2557 
2558         if (rc != 0)
2559                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2560 
2561         free_rsp_buf(resp_buftype, rsp);
2562         kfree(iov);
2563         return rc;
2564 }
2565 
2566 int
2567 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2568             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2569 {
2570         struct smb2_file_rename_info info;
2571         void **data;
2572         unsigned int size[2];
2573         int rc;
2574         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2575 
2576         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2577         if (!data)
2578                 return -ENOMEM;
2579 
2580         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2581                               /* 0 = fail if target already exists */
2582         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2583         info.FileNameLength = cpu_to_le32(len);
2584 
2585         data[0] = &info;
2586         size[0] = sizeof(struct smb2_file_rename_info);
2587 
2588         data[1] = target_file;
2589         size[1] = len + 2 /* null */;
2590 
2591         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2592                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2593                            size);
2594         kfree(data);
2595         return rc;
2596 }
2597 
2598 int
2599 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
2600                   u64 persistent_fid, u64 volatile_fid)
2601 {
2602         __u8 delete_pending = 1;
2603         void *data;
2604         unsigned int size;
2605 
2606         data = &delete_pending;
2607         size = 1; /* sizeof __u8 */
2608 
2609         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2610                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
2611                         &size);
2612 }
2613 
2614 int
2615 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2616                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2617 {
2618         struct smb2_file_link_info info;
2619         void **data;
2620         unsigned int size[2];
2621         int rc;
2622         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2623 
2624         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2625         if (!data)
2626                 return -ENOMEM;
2627 
2628         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2629                               /* 0 = fail if link already exists */
2630         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2631         info.FileNameLength = cpu_to_le32(len);
2632 
2633         data[0] = &info;
2634         size[0] = sizeof(struct smb2_file_link_info);
2635 
2636         data[1] = target_file;
2637         size[1] = len + 2 /* null */;
2638 
2639         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2640                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2641         kfree(data);
2642         return rc;
2643 }
2644 
2645 int
2646 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2647              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2648 {
2649         struct smb2_file_eof_info info;
2650         void *data;
2651         unsigned int size;
2652 
2653         info.EndOfFile = *eof;
2654 
2655         data = &info;
2656         size = sizeof(struct smb2_file_eof_info);
2657 
2658         if (is_falloc)
2659                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2660                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2661         else
2662                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2663                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2664 }
2665 
2666 int
2667 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2668               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2669 {
2670         unsigned int size;
2671         size = sizeof(FILE_BASIC_INFO);
2672         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2673                              current->tgid, FILE_BASIC_INFORMATION, 1,
2674                              (void **)&buf, &size);
2675 }
2676 
2677 int
2678 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2679                   const u64 persistent_fid, const u64 volatile_fid,
2680                   __u8 oplock_level)
2681 {
2682         int rc;
2683         struct smb2_oplock_break *req = NULL;
2684 
2685         cifs_dbg(FYI, "SMB2_oplock_break\n");
2686         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2687 
2688         if (rc)
2689                 return rc;
2690 
2691         req->VolatileFid = volatile_fid;
2692         req->PersistentFid = persistent_fid;
2693         req->OplockLevel = oplock_level;
2694         req->hdr.CreditRequest = cpu_to_le16(1);
2695 
2696         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2697         /* SMB2 buffer freed by function above */
2698 
2699         if (rc) {
2700                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2701                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2702         }
2703 
2704         return rc;
2705 }
2706 
2707 static void
2708 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2709                         struct kstatfs *kst)
2710 {
2711         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2712                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2713         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2714         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2715         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2716         return;
2717 }
2718 
2719 static int
2720 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2721                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2722 {
2723         int rc;
2724         struct smb2_query_info_req *req;
2725 
2726         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2727 
2728         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2729                 return -EIO;
2730 
2731         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2732         if (rc)
2733                 return rc;
2734 
2735         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2736         req->FileInfoClass = level;
2737         req->PersistentFileId = persistent_fid;
2738         req->VolatileFileId = volatile_fid;
2739         /* 4 for rfc1002 length field and 1 for pad */
2740         req->InputBufferOffset =
2741                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2742         req->OutputBufferLength = cpu_to_le32(
2743                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2744 
2745         iov->iov_base = (char *)req;
2746         /* 4 for rfc1002 length field */
2747         iov->iov_len = get_rfc1002_length(req) + 4;
2748         return 0;
2749 }
2750 
2751 int
2752 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2753               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2754 {
2755         struct smb2_query_info_rsp *rsp = NULL;
2756         struct kvec iov;
2757         int rc = 0;
2758         int resp_buftype;
2759         struct cifs_ses *ses = tcon->ses;
2760         struct smb2_fs_full_size_info *info = NULL;
2761 
2762         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2763                                 sizeof(struct smb2_fs_full_size_info),
2764                                 persistent_fid, volatile_fid);
2765         if (rc)
2766                 return rc;
2767 
2768         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2769         if (rc) {
2770                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2771                 goto qfsinf_exit;
2772         }
2773         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2774 
2775         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2776                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2777         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2778                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2779                           sizeof(struct smb2_fs_full_size_info));
2780         if (!rc)
2781                 copy_fs_info_to_kstatfs(info, fsdata);
2782 
2783 qfsinf_exit:
2784         free_rsp_buf(resp_buftype, iov.iov_base);
2785         return rc;
2786 }
2787 
2788 int
2789 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2790               u64 persistent_fid, u64 volatile_fid, int level)
2791 {
2792         struct smb2_query_info_rsp *rsp = NULL;
2793         struct kvec iov;
2794         int rc = 0;
2795         int resp_buftype, max_len, min_len;
2796         struct cifs_ses *ses = tcon->ses;
2797         unsigned int rsp_len, offset;
2798 
2799         if (level == FS_DEVICE_INFORMATION) {
2800                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2801                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2802         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2803                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2804                 min_len = MIN_FS_ATTR_INFO_SIZE;
2805         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2806                 max_len = sizeof(struct smb3_fs_ss_info);
2807                 min_len = sizeof(struct smb3_fs_ss_info);
2808         } else {
2809                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2810                 return -EINVAL;
2811         }
2812 
2813         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2814                                 persistent_fid, volatile_fid);
2815         if (rc)
2816                 return rc;
2817 
2818         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2819         if (rc) {
2820                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2821                 goto qfsattr_exit;
2822         }
2823         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2824 
2825         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2826         offset = le16_to_cpu(rsp->OutputBufferOffset);
2827         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2828         if (rc)
2829                 goto qfsattr_exit;
2830 
2831         if (level == FS_ATTRIBUTE_INFORMATION)
2832                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2833                         + (char *)&rsp->hdr, min_t(unsigned int,
2834                         rsp_len, max_len));
2835         else if (level == FS_DEVICE_INFORMATION)
2836                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2837                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2838         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2839                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2840                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2841                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2842                 tcon->perf_sector_size =
2843                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2844         }
2845 
2846 qfsattr_exit:
2847         free_rsp_buf(resp_buftype, iov.iov_base);
2848         return rc;
2849 }
2850 
2851 int
2852 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2853            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2854            const __u32 num_lock, struct smb2_lock_element *buf)
2855 {
2856         int rc = 0;
2857         struct smb2_lock_req *req = NULL;
2858         struct kvec iov[2];
2859         int resp_buf_type;
2860         unsigned int count;
2861 
2862         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2863 
2864         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2865         if (rc)
2866                 return rc;
2867 
2868         req->hdr.ProcessId = cpu_to_le32(pid);
2869         req->LockCount = cpu_to_le16(num_lock);
2870 
2871         req->PersistentFileId = persist_fid;
2872         req->VolatileFileId = volatile_fid;
2873 
2874         count = num_lock * sizeof(struct smb2_lock_element);
2875         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2876 
2877         iov[0].iov_base = (char *)req;
2878         /* 4 for rfc1002 length field and count for all locks */
2879         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2880         iov[1].iov_base = (char *)buf;
2881         iov[1].iov_len = count;
2882 
2883         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2884         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2885         if (rc) {
2886                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2887                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2888         }
2889 
2890         return rc;
2891 }
2892 
2893 int
2894 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2895           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2896           const __u64 length, const __u64 offset, const __u32 lock_flags,
2897           const bool wait)
2898 {
2899         struct smb2_lock_element lock;
2900 
2901         lock.Offset = cpu_to_le64(offset);
2902         lock.Length = cpu_to_le64(length);
2903         lock.Flags = cpu_to_le32(lock_flags);
2904         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2905                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2906 
2907         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2908 }
2909 
2910 int
2911 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2912                  __u8 *lease_key, const __le32 lease_state)
2913 {
2914         int rc;
2915         struct smb2_lease_ack *req = NULL;
2916 
2917         cifs_dbg(FYI, "SMB2_lease_break\n");
2918         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2919 
2920         if (rc)
2921                 return rc;
2922 
2923         req->hdr.CreditRequest = cpu_to_le16(1);
2924         req->StructureSize = cpu_to_le16(36);
2925         inc_rfc1001_len(req, 12);
2926 
2927         memcpy(req->LeaseKey, lease_key, 16);
2928         req->LeaseState = lease_state;
2929 
2930         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2931         /* SMB2 buffer freed by function above */
2932 
2933         if (rc) {
2934                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2935                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2936         }
2937 
2938         return rc;
2939 }
2940 

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