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Linux/fs/cifs/smb2pdu.c

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
  5  *                 Etersoft, 2012
  6  *   Author(s): Steve French (sfrench@us.ibm.com)
  7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
  8  *
  9  *   Contains the routines for constructing the SMB2 PDUs themselves
 10  *
 11  *   This library is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU Lesser General Public License as published
 13  *   by the Free Software Foundation; either version 2.1 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This library is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 19  *   the GNU Lesser General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU Lesser General Public License
 22  *   along with this library; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  */
 25 
 26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 27  /* Note that there are handle based routines which must be                   */
 28  /* treated slightly differently for reconnection purposes since we never     */
 29  /* want to reuse a stale file handle and only the caller knows the file info */
 30 
 31 #include <linux/fs.h>
 32 #include <linux/kernel.h>
 33 #include <linux/vfs.h>
 34 #include <linux/task_io_accounting_ops.h>
 35 #include <linux/uaccess.h>
 36 #include <linux/uuid.h>
 37 #include <linux/pagemap.h>
 38 #include <linux/xattr.h>
 39 #include "smb2pdu.h"
 40 #include "cifsglob.h"
 41 #include "cifsacl.h"
 42 #include "cifsproto.h"
 43 #include "smb2proto.h"
 44 #include "cifs_unicode.h"
 45 #include "cifs_debug.h"
 46 #include "ntlmssp.h"
 47 #include "smb2status.h"
 48 #include "smb2glob.h"
 49 #include "cifspdu.h"
 50 #include "cifs_spnego.h"
 51 
 52 /*
 53  *  The following table defines the expected "StructureSize" of SMB2 requests
 54  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 55  *
 56  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 57  *  indexed by command in host byte order.
 58  */
 59 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
 60         /* SMB2_NEGOTIATE */ 36,
 61         /* SMB2_SESSION_SETUP */ 25,
 62         /* SMB2_LOGOFF */ 4,
 63         /* SMB2_TREE_CONNECT */ 9,
 64         /* SMB2_TREE_DISCONNECT */ 4,
 65         /* SMB2_CREATE */ 57,
 66         /* SMB2_CLOSE */ 24,
 67         /* SMB2_FLUSH */ 24,
 68         /* SMB2_READ */ 49,
 69         /* SMB2_WRITE */ 49,
 70         /* SMB2_LOCK */ 48,
 71         /* SMB2_IOCTL */ 57,
 72         /* SMB2_CANCEL */ 4,
 73         /* SMB2_ECHO */ 4,
 74         /* SMB2_QUERY_DIRECTORY */ 33,
 75         /* SMB2_CHANGE_NOTIFY */ 32,
 76         /* SMB2_QUERY_INFO */ 41,
 77         /* SMB2_SET_INFO */ 33,
 78         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
 79 };
 80 
 81 static int encryption_required(const struct cifs_tcon *tcon)
 82 {
 83         if (!tcon)
 84                 return 0;
 85         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
 86             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
 87                 return 1;
 88         if (tcon->seal &&
 89             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 90                 return 1;
 91         return 0;
 92 }
 93 
 94 static void
 95 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 96                   const struct cifs_tcon *tcon)
 97 {
 98         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 99         shdr->StructureSize = cpu_to_le16(64);
100         shdr->Command = smb2_cmd;
101         if (tcon && tcon->ses && tcon->ses->server) {
102                 struct TCP_Server_Info *server = tcon->ses->server;
103 
104                 spin_lock(&server->req_lock);
105                 /* Request up to 2 credits but don't go over the limit. */
106                 if (server->credits >= server->max_credits)
107                         shdr->CreditRequest = cpu_to_le16(0);
108                 else
109                         shdr->CreditRequest = cpu_to_le16(
110                                 min_t(int, server->max_credits -
111                                                 server->credits, 2));
112                 spin_unlock(&server->req_lock);
113         } else {
114                 shdr->CreditRequest = cpu_to_le16(2);
115         }
116         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
117 
118         if (!tcon)
119                 goto out;
120 
121         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
122         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
123         if ((tcon->ses) && (tcon->ses->server) &&
124             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
125                 shdr->CreditCharge = cpu_to_le16(1);
126         /* else CreditCharge MBZ */
127 
128         shdr->TreeId = tcon->tid;
129         /* Uid is not converted */
130         if (tcon->ses)
131                 shdr->SessionId = tcon->ses->Suid;
132 
133         /*
134          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
135          * to pass the path on the Open SMB prefixed by \\server\share.
136          * Not sure when we would need to do the augmented path (if ever) and
137          * setting this flag breaks the SMB2 open operation since it is
138          * illegal to send an empty path name (without \\server\share prefix)
139          * when the DFS flag is set in the SMB open header. We could
140          * consider setting the flag on all operations other than open
141          * but it is safer to net set it for now.
142          */
143 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
144                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
145 
146         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
147             !encryption_required(tcon))
148                 shdr->Flags |= SMB2_FLAGS_SIGNED;
149 out:
150         return;
151 }
152 
153 static int
154 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
155 {
156         int rc = 0;
157         struct nls_table *nls_codepage;
158         struct cifs_ses *ses;
159         struct TCP_Server_Info *server;
160 
161         /*
162          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
163          * check for tcp and smb session status done differently
164          * for those three - in the calling routine.
165          */
166         if (tcon == NULL)
167                 return rc;
168 
169         if (smb2_command == SMB2_TREE_CONNECT)
170                 return rc;
171 
172         if (tcon->tidStatus == CifsExiting) {
173                 /*
174                  * only tree disconnect, open, and write,
175                  * (and ulogoff which does not have tcon)
176                  * are allowed as we start force umount.
177                  */
178                 if ((smb2_command != SMB2_WRITE) &&
179                    (smb2_command != SMB2_CREATE) &&
180                    (smb2_command != SMB2_TREE_DISCONNECT)) {
181                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
182                                  smb2_command);
183                         return -ENODEV;
184                 }
185         }
186         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
187             (!tcon->ses->server))
188                 return -EIO;
189 
190         ses = tcon->ses;
191         server = ses->server;
192 
193         /*
194          * Give demultiplex thread up to 10 seconds to reconnect, should be
195          * greater than cifs socket timeout which is 7 seconds
196          */
197         while (server->tcpStatus == CifsNeedReconnect) {
198                 /*
199                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
200                  * here since they are implicitly done when session drops.
201                  */
202                 switch (smb2_command) {
203                 /*
204                  * BB Should we keep oplock break and add flush to exceptions?
205                  */
206                 case SMB2_TREE_DISCONNECT:
207                 case SMB2_CANCEL:
208                 case SMB2_CLOSE:
209                 case SMB2_OPLOCK_BREAK:
210                         return -EAGAIN;
211                 }
212 
213                 wait_event_interruptible_timeout(server->response_q,
214                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
215 
216                 /* are we still trying to reconnect? */
217                 if (server->tcpStatus != CifsNeedReconnect)
218                         break;
219 
220                 /*
221                  * on "soft" mounts we wait once. Hard mounts keep
222                  * retrying until process is killed or server comes
223                  * back on-line
224                  */
225                 if (!tcon->retry) {
226                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
227                         return -EHOSTDOWN;
228                 }
229         }
230 
231         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
232                 return rc;
233 
234         nls_codepage = load_nls_default();
235 
236         /*
237          * need to prevent multiple threads trying to simultaneously reconnect
238          * the same SMB session
239          */
240         mutex_lock(&tcon->ses->session_mutex);
241         rc = cifs_negotiate_protocol(0, tcon->ses);
242         if (!rc && tcon->ses->need_reconnect)
243                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
244 
245         if (rc || !tcon->need_reconnect) {
246                 mutex_unlock(&tcon->ses->session_mutex);
247                 goto out;
248         }
249 
250         cifs_mark_open_files_invalid(tcon);
251         if (tcon->use_persistent)
252                 tcon->need_reopen_files = true;
253 
254         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
255         mutex_unlock(&tcon->ses->session_mutex);
256 
257         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
258         if (rc)
259                 goto out;
260 
261         if (smb2_command != SMB2_INTERNAL_CMD)
262                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
263 
264         atomic_inc(&tconInfoReconnectCount);
265 out:
266         /*
267          * Check if handle based operation so we know whether we can continue
268          * or not without returning to caller to reset file handle.
269          */
270         /*
271          * BB Is flush done by server on drop of tcp session? Should we special
272          * case it and skip above?
273          */
274         switch (smb2_command) {
275         case SMB2_FLUSH:
276         case SMB2_READ:
277         case SMB2_WRITE:
278         case SMB2_LOCK:
279         case SMB2_IOCTL:
280         case SMB2_QUERY_DIRECTORY:
281         case SMB2_CHANGE_NOTIFY:
282         case SMB2_QUERY_INFO:
283         case SMB2_SET_INFO:
284                 rc = -EAGAIN;
285         }
286         unload_nls(nls_codepage);
287         return rc;
288 }
289 
290 static void
291 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
292                unsigned int *total_len)
293 {
294         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
295         /* lookup word count ie StructureSize from table */
296         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
297 
298         /*
299          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
300          * largest operations (Create)
301          */
302         memset(buf, 0, 256);
303 
304         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
305         spdu->StructureSize2 = cpu_to_le16(parmsize);
306 
307         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
308 }
309 
310 /* init request without RFC1001 length at the beginning */
311 static int
312 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
313                     void **request_buf, unsigned int *total_len)
314 {
315         int rc;
316         struct smb2_sync_hdr *shdr;
317 
318         rc = smb2_reconnect(smb2_command, tcon);
319         if (rc)
320                 return rc;
321 
322         /* BB eventually switch this to SMB2 specific small buf size */
323         *request_buf = cifs_small_buf_get();
324         if (*request_buf == NULL) {
325                 /* BB should we add a retry in here if not a writepage? */
326                 return -ENOMEM;
327         }
328 
329         shdr = (struct smb2_sync_hdr *)(*request_buf);
330 
331         fill_small_buf(smb2_command, tcon, shdr, total_len);
332 
333         if (tcon != NULL) {
334 #ifdef CONFIG_CIFS_STATS2
335                 uint16_t com_code = le16_to_cpu(smb2_command);
336 
337                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
338 #endif
339                 cifs_stats_inc(&tcon->num_smbs_sent);
340         }
341 
342         return rc;
343 }
344 
345 /*
346  * Allocate and return pointer to an SMB request hdr, and set basic
347  * SMB information in the SMB header. If the return code is zero, this
348  * function must have filled in request_buf pointer. The returned buffer
349  * has RFC1001 length at the beginning.
350  */
351 static int
352 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
353                 void **request_buf)
354 {
355         int rc;
356         unsigned int total_len;
357         struct smb2_pdu *pdu;
358 
359         rc = smb2_reconnect(smb2_command, tcon);
360         if (rc)
361                 return rc;
362 
363         /* BB eventually switch this to SMB2 specific small buf size */
364         *request_buf = cifs_small_buf_get();
365         if (*request_buf == NULL) {
366                 /* BB should we add a retry in here if not a writepage? */
367                 return -ENOMEM;
368         }
369 
370         pdu = (struct smb2_pdu *)(*request_buf);
371 
372         fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
373 
374         /* Note this is only network field converted to big endian */
375         pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
376 
377         if (tcon != NULL) {
378 #ifdef CONFIG_CIFS_STATS2
379                 uint16_t com_code = le16_to_cpu(smb2_command);
380                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
381 #endif
382                 cifs_stats_inc(&tcon->num_smbs_sent);
383         }
384 
385         return rc;
386 }
387 
388 #ifdef CONFIG_CIFS_SMB311
389 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
390 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
391 
392 
393 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
394 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
395 
396 static void
397 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
398 {
399         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
400         pneg_ctxt->DataLength = cpu_to_le16(38);
401         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
402         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
403         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
404         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
405 }
406 
407 static void
408 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
409 {
410         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
411         pneg_ctxt->DataLength = cpu_to_le16(6);
412         pneg_ctxt->CipherCount = cpu_to_le16(2);
413         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
414         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
415 }
416 
417 static void
418 assemble_neg_contexts(struct smb2_negotiate_req *req)
419 {
420 
421         /* +4 is to account for the RFC1001 len field */
422         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
423 
424         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
425         /* Add 2 to size to round to 8 byte boundary */
426         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
427         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
428         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
429         req->NegotiateContextCount = cpu_to_le16(2);
430         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
431                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
432 }
433 #else
434 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
435 {
436         return;
437 }
438 #endif /* SMB311 */
439 
440 /*
441  *
442  *      SMB2 Worker functions follow:
443  *
444  *      The general structure of the worker functions is:
445  *      1) Call smb2_init (assembles SMB2 header)
446  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
447  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
448  *      4) Decode SMB2 command specific fields in the fixed length area
449  *      5) Decode variable length data area (if any for this SMB2 command type)
450  *      6) Call free smb buffer
451  *      7) return
452  *
453  */
454 
455 int
456 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
457 {
458         struct smb2_negotiate_req *req;
459         struct smb2_negotiate_rsp *rsp;
460         struct kvec iov[1];
461         struct kvec rsp_iov;
462         int rc = 0;
463         int resp_buftype;
464         struct TCP_Server_Info *server = ses->server;
465         int blob_offset, blob_length;
466         char *security_blob;
467         int flags = CIFS_NEG_OP;
468 
469         cifs_dbg(FYI, "Negotiate protocol\n");
470 
471         if (!server) {
472                 WARN(1, "%s: server is NULL!\n", __func__);
473                 return -EIO;
474         }
475 
476         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
477         if (rc)
478                 return rc;
479 
480         req->hdr.sync_hdr.SessionId = 0;
481 
482         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
483 
484         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
485         inc_rfc1001_len(req, 2);
486 
487         /* only one of SMB2 signing flags may be set in SMB2 request */
488         if (ses->sign)
489                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
490         else if (global_secflags & CIFSSEC_MAY_SIGN)
491                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
492         else
493                 req->SecurityMode = 0;
494 
495         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
496 
497         /* ClientGUID must be zero for SMB2.02 dialect */
498         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
499                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
500         else {
501                 memcpy(req->ClientGUID, server->client_guid,
502                         SMB2_CLIENT_GUID_SIZE);
503                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
504                         assemble_neg_contexts(req);
505         }
506         iov[0].iov_base = (char *)req;
507         /* 4 for rfc1002 length field */
508         iov[0].iov_len = get_rfc1002_length(req) + 4;
509 
510         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
511         cifs_small_buf_release(req);
512         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
513         /*
514          * No tcon so can't do
515          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
516          */
517         if (rc != 0)
518                 goto neg_exit;
519 
520         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
521 
522         /* BB we may eventually want to match the negotiated vs. requested
523            dialect, even though we are only requesting one at a time */
524         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
525                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
526         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
527                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
528         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
529                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
530         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
531                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
532 #ifdef CONFIG_CIFS_SMB311
533         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
534                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
535 #endif /* SMB311 */
536         else {
537                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
538                          le16_to_cpu(rsp->DialectRevision));
539                 rc = -EIO;
540                 goto neg_exit;
541         }
542         server->dialect = le16_to_cpu(rsp->DialectRevision);
543 
544         /* SMB2 only has an extended negflavor */
545         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
546         /* set it to the maximum buffer size value we can send with 1 credit */
547         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
548                                SMB2_MAX_BUFFER_SIZE);
549         server->max_read = le32_to_cpu(rsp->MaxReadSize);
550         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
551         /* BB Do we need to validate the SecurityMode? */
552         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
553         server->capabilities = le32_to_cpu(rsp->Capabilities);
554         /* Internal types */
555         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
556 
557         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
558                                                &rsp->hdr);
559         /*
560          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
561          * for us will be
562          *      ses->sectype = RawNTLMSSP;
563          * but for time being this is our only auth choice so doesn't matter.
564          * We just found a server which sets blob length to zero expecting raw.
565          */
566         if (blob_length == 0) {
567                 cifs_dbg(FYI, "missing security blob on negprot\n");
568                 server->sec_ntlmssp = true;
569         }
570 
571         rc = cifs_enable_signing(server, ses->sign);
572         if (rc)
573                 goto neg_exit;
574         if (blob_length) {
575                 rc = decode_negTokenInit(security_blob, blob_length, server);
576                 if (rc == 1)
577                         rc = 0;
578                 else if (rc == 0)
579                         rc = -EIO;
580         }
581 neg_exit:
582         free_rsp_buf(resp_buftype, rsp);
583         return rc;
584 }
585 
586 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
587 {
588         int rc = 0;
589         struct validate_negotiate_info_req vneg_inbuf;
590         struct validate_negotiate_info_rsp *pneg_rsp;
591         u32 rsplen;
592 
593         cifs_dbg(FYI, "validate negotiate\n");
594 
595         /*
596          * validation ioctl must be signed, so no point sending this if we
597          * can not sign it.  We could eventually change this to selectively
598          * sign just this, the first and only signed request on a connection.
599          * This is good enough for now since a user who wants better security
600          * would also enable signing on the mount. Having validation of
601          * negotiate info for signed connections helps reduce attack vectors
602          */
603         if (tcon->ses->server->sign == false)
604                 return 0; /* validation requires signing */
605 
606         vneg_inbuf.Capabilities =
607                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
608         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
609                                         SMB2_CLIENT_GUID_SIZE);
610 
611         if (tcon->ses->sign)
612                 vneg_inbuf.SecurityMode =
613                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
614         else if (global_secflags & CIFSSEC_MAY_SIGN)
615                 vneg_inbuf.SecurityMode =
616                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
617         else
618                 vneg_inbuf.SecurityMode = 0;
619 
620         vneg_inbuf.DialectCount = cpu_to_le16(1);
621         vneg_inbuf.Dialects[0] =
622                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
623 
624         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
625                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
626                 false /* use_ipc */,
627                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
628                 (char **)&pneg_rsp, &rsplen);
629 
630         if (rc != 0) {
631                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
632                 return -EIO;
633         }
634 
635         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
636                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
637                          rsplen);
638 
639                 /* relax check since Mac returns max bufsize allowed on ioctl */
640                 if (rsplen > CIFSMaxBufSize)
641                         return -EIO;
642         }
643 
644         /* check validate negotiate info response matches what we got earlier */
645         if (pneg_rsp->Dialect !=
646                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
647                 goto vneg_out;
648 
649         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
650                 goto vneg_out;
651 
652         /* do not validate server guid because not saved at negprot time yet */
653 
654         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
655               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
656                 goto vneg_out;
657 
658         /* validate negotiate successful */
659         cifs_dbg(FYI, "validate negotiate info successful\n");
660         return 0;
661 
662 vneg_out:
663         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
664         return -EIO;
665 }
666 
667 enum securityEnum
668 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
669 {
670         switch (requested) {
671         case Kerberos:
672         case RawNTLMSSP:
673                 return requested;
674         case NTLMv2:
675                 return RawNTLMSSP;
676         case Unspecified:
677                 if (server->sec_ntlmssp &&
678                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
679                         return RawNTLMSSP;
680                 if ((server->sec_kerberos || server->sec_mskerberos) &&
681                         (global_secflags & CIFSSEC_MAY_KRB5))
682                         return Kerberos;
683                 /* Fallthrough */
684         default:
685                 return Unspecified;
686         }
687 }
688 
689 struct SMB2_sess_data {
690         unsigned int xid;
691         struct cifs_ses *ses;
692         struct nls_table *nls_cp;
693         void (*func)(struct SMB2_sess_data *);
694         int result;
695         u64 previous_session;
696 
697         /* we will send the SMB in three pieces:
698          * a fixed length beginning part, an optional
699          * SPNEGO blob (which can be zero length), and a
700          * last part which will include the strings
701          * and rest of bcc area. This allows us to avoid
702          * a large buffer 17K allocation
703          */
704         int buf0_type;
705         struct kvec iov[2];
706 };
707 
708 static int
709 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
710 {
711         int rc;
712         struct cifs_ses *ses = sess_data->ses;
713         struct smb2_sess_setup_req *req;
714         struct TCP_Server_Info *server = ses->server;
715 
716         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
717         if (rc)
718                 return rc;
719 
720         /* First session, not a reauthenticate */
721         req->hdr.sync_hdr.SessionId = 0;
722 
723         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
724         req->PreviousSessionId = sess_data->previous_session;
725 
726         req->Flags = 0; /* MBZ */
727         /* to enable echos and oplocks */
728         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
729 
730         /* only one of SMB2 signing flags may be set in SMB2 request */
731         if (server->sign)
732                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
733         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
734                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
735         else
736                 req->SecurityMode = 0;
737 
738         req->Capabilities = 0;
739         req->Channel = 0; /* MBZ */
740 
741         sess_data->iov[0].iov_base = (char *)req;
742         /* 4 for rfc1002 length field and 1 for pad */
743         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
744         /*
745          * This variable will be used to clear the buffer
746          * allocated above in case of any error in the calling function.
747          */
748         sess_data->buf0_type = CIFS_SMALL_BUFFER;
749 
750         return 0;
751 }
752 
753 static void
754 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
755 {
756         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
757         sess_data->buf0_type = CIFS_NO_BUFFER;
758 }
759 
760 static int
761 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
762 {
763         int rc;
764         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
765         struct kvec rsp_iov = { NULL, 0 };
766 
767         /* Testing shows that buffer offset must be at location of Buffer[0] */
768         req->SecurityBufferOffset =
769                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
770                         1 /* pad */ - 4 /* rfc1001 len */);
771         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
772 
773         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
774 
775         /* BB add code to build os and lm fields */
776 
777         rc = SendReceive2(sess_data->xid, sess_data->ses,
778                                 sess_data->iov, 2,
779                                 &sess_data->buf0_type,
780                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
781         cifs_small_buf_release(sess_data->iov[0].iov_base);
782         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
783 
784         return rc;
785 }
786 
787 static int
788 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
789 {
790         int rc = 0;
791         struct cifs_ses *ses = sess_data->ses;
792 
793         mutex_lock(&ses->server->srv_mutex);
794         if (ses->server->ops->generate_signingkey) {
795                 rc = ses->server->ops->generate_signingkey(ses);
796                 if (rc) {
797                         cifs_dbg(FYI,
798                                 "SMB3 session key generation failed\n");
799                         mutex_unlock(&ses->server->srv_mutex);
800                         return rc;
801                 }
802         }
803         if (!ses->server->session_estab) {
804                 ses->server->sequence_number = 0x2;
805                 ses->server->session_estab = true;
806         }
807         mutex_unlock(&ses->server->srv_mutex);
808 
809         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
810         spin_lock(&GlobalMid_Lock);
811         ses->status = CifsGood;
812         ses->need_reconnect = false;
813         spin_unlock(&GlobalMid_Lock);
814         return rc;
815 }
816 
817 #ifdef CONFIG_CIFS_UPCALL
818 static void
819 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
820 {
821         int rc;
822         struct cifs_ses *ses = sess_data->ses;
823         struct cifs_spnego_msg *msg;
824         struct key *spnego_key = NULL;
825         struct smb2_sess_setup_rsp *rsp = NULL;
826 
827         rc = SMB2_sess_alloc_buffer(sess_data);
828         if (rc)
829                 goto out;
830 
831         spnego_key = cifs_get_spnego_key(ses);
832         if (IS_ERR(spnego_key)) {
833                 rc = PTR_ERR(spnego_key);
834                 spnego_key = NULL;
835                 goto out;
836         }
837 
838         msg = spnego_key->payload.data[0];
839         /*
840          * check version field to make sure that cifs.upcall is
841          * sending us a response in an expected form
842          */
843         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
844                 cifs_dbg(VFS,
845                           "bad cifs.upcall version. Expected %d got %d",
846                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
847                 rc = -EKEYREJECTED;
848                 goto out_put_spnego_key;
849         }
850 
851         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
852                                          GFP_KERNEL);
853         if (!ses->auth_key.response) {
854                 cifs_dbg(VFS,
855                         "Kerberos can't allocate (%u bytes) memory",
856                         msg->sesskey_len);
857                 rc = -ENOMEM;
858                 goto out_put_spnego_key;
859         }
860         ses->auth_key.len = msg->sesskey_len;
861 
862         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
863         sess_data->iov[1].iov_len = msg->secblob_len;
864 
865         rc = SMB2_sess_sendreceive(sess_data);
866         if (rc)
867                 goto out_put_spnego_key;
868 
869         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
870         ses->Suid = rsp->hdr.sync_hdr.SessionId;
871 
872         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
873 
874         rc = SMB2_sess_establish_session(sess_data);
875 out_put_spnego_key:
876         key_invalidate(spnego_key);
877         key_put(spnego_key);
878 out:
879         sess_data->result = rc;
880         sess_data->func = NULL;
881         SMB2_sess_free_buffer(sess_data);
882 }
883 #else
884 static void
885 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
886 {
887         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
888         sess_data->result = -EOPNOTSUPP;
889         sess_data->func = NULL;
890 }
891 #endif
892 
893 static void
894 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
895 
896 static void
897 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
898 {
899         int rc;
900         struct cifs_ses *ses = sess_data->ses;
901         struct smb2_sess_setup_rsp *rsp = NULL;
902         char *ntlmssp_blob = NULL;
903         bool use_spnego = false; /* else use raw ntlmssp */
904         u16 blob_length = 0;
905 
906         /*
907          * If memory allocation is successful, caller of this function
908          * frees it.
909          */
910         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
911         if (!ses->ntlmssp) {
912                 rc = -ENOMEM;
913                 goto out_err;
914         }
915         ses->ntlmssp->sesskey_per_smbsess = true;
916 
917         rc = SMB2_sess_alloc_buffer(sess_data);
918         if (rc)
919                 goto out_err;
920 
921         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
922                                GFP_KERNEL);
923         if (ntlmssp_blob == NULL) {
924                 rc = -ENOMEM;
925                 goto out;
926         }
927 
928         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
929         if (use_spnego) {
930                 /* BB eventually need to add this */
931                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
932                 rc = -EOPNOTSUPP;
933                 goto out;
934         } else {
935                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
936                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
937         }
938         sess_data->iov[1].iov_base = ntlmssp_blob;
939         sess_data->iov[1].iov_len = blob_length;
940 
941         rc = SMB2_sess_sendreceive(sess_data);
942         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
943 
944         /* If true, rc here is expected and not an error */
945         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
946                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
947                 rc = 0;
948 
949         if (rc)
950                 goto out;
951 
952         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
953                         le16_to_cpu(rsp->SecurityBufferOffset)) {
954                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
955                         le16_to_cpu(rsp->SecurityBufferOffset));
956                 rc = -EIO;
957                 goto out;
958         }
959         rc = decode_ntlmssp_challenge(rsp->Buffer,
960                         le16_to_cpu(rsp->SecurityBufferLength), ses);
961         if (rc)
962                 goto out;
963 
964         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
965 
966 
967         ses->Suid = rsp->hdr.sync_hdr.SessionId;
968         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
969 
970 out:
971         kfree(ntlmssp_blob);
972         SMB2_sess_free_buffer(sess_data);
973         if (!rc) {
974                 sess_data->result = 0;
975                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
976                 return;
977         }
978 out_err:
979         kfree(ses->ntlmssp);
980         ses->ntlmssp = NULL;
981         sess_data->result = rc;
982         sess_data->func = NULL;
983 }
984 
985 static void
986 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
987 {
988         int rc;
989         struct cifs_ses *ses = sess_data->ses;
990         struct smb2_sess_setup_req *req;
991         struct smb2_sess_setup_rsp *rsp = NULL;
992         unsigned char *ntlmssp_blob = NULL;
993         bool use_spnego = false; /* else use raw ntlmssp */
994         u16 blob_length = 0;
995 
996         rc = SMB2_sess_alloc_buffer(sess_data);
997         if (rc)
998                 goto out;
999 
1000         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1001         req->hdr.sync_hdr.SessionId = ses->Suid;
1002 
1003         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1004                                         sess_data->nls_cp);
1005         if (rc) {
1006                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1007                 goto out;
1008         }
1009 
1010         if (use_spnego) {
1011                 /* BB eventually need to add this */
1012                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1013                 rc = -EOPNOTSUPP;
1014                 goto out;
1015         }
1016         sess_data->iov[1].iov_base = ntlmssp_blob;
1017         sess_data->iov[1].iov_len = blob_length;
1018 
1019         rc = SMB2_sess_sendreceive(sess_data);
1020         if (rc)
1021                 goto out;
1022 
1023         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1024 
1025         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1026         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1027 
1028         rc = SMB2_sess_establish_session(sess_data);
1029 out:
1030         kfree(ntlmssp_blob);
1031         SMB2_sess_free_buffer(sess_data);
1032         kfree(ses->ntlmssp);
1033         ses->ntlmssp = NULL;
1034         sess_data->result = rc;
1035         sess_data->func = NULL;
1036 }
1037 
1038 static int
1039 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1040 {
1041         int type;
1042 
1043         type = smb2_select_sectype(ses->server, ses->sectype);
1044         cifs_dbg(FYI, "sess setup type %d\n", type);
1045         if (type == Unspecified) {
1046                 cifs_dbg(VFS,
1047                         "Unable to select appropriate authentication method!");
1048                 return -EINVAL;
1049         }
1050 
1051         switch (type) {
1052         case Kerberos:
1053                 sess_data->func = SMB2_auth_kerberos;
1054                 break;
1055         case RawNTLMSSP:
1056                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1057                 break;
1058         default:
1059                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1060                 return -EOPNOTSUPP;
1061         }
1062 
1063         return 0;
1064 }
1065 
1066 int
1067 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1068                 const struct nls_table *nls_cp)
1069 {
1070         int rc = 0;
1071         struct TCP_Server_Info *server = ses->server;
1072         struct SMB2_sess_data *sess_data;
1073 
1074         cifs_dbg(FYI, "Session Setup\n");
1075 
1076         if (!server) {
1077                 WARN(1, "%s: server is NULL!\n", __func__);
1078                 return -EIO;
1079         }
1080 
1081         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1082         if (!sess_data)
1083                 return -ENOMEM;
1084 
1085         rc = SMB2_select_sec(ses, sess_data);
1086         if (rc)
1087                 goto out;
1088         sess_data->xid = xid;
1089         sess_data->ses = ses;
1090         sess_data->buf0_type = CIFS_NO_BUFFER;
1091         sess_data->nls_cp = (struct nls_table *) nls_cp;
1092 
1093         while (sess_data->func)
1094                 sess_data->func(sess_data);
1095 
1096         rc = sess_data->result;
1097 out:
1098         kfree(sess_data);
1099         return rc;
1100 }
1101 
1102 int
1103 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1104 {
1105         struct smb2_logoff_req *req; /* response is also trivial struct */
1106         int rc = 0;
1107         struct TCP_Server_Info *server;
1108         int flags = 0;
1109 
1110         cifs_dbg(FYI, "disconnect session %p\n", ses);
1111 
1112         if (ses && (ses->server))
1113                 server = ses->server;
1114         else
1115                 return -EIO;
1116 
1117         /* no need to send SMB logoff if uid already closed due to reconnect */
1118         if (ses->need_reconnect)
1119                 goto smb2_session_already_dead;
1120 
1121         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1122         if (rc)
1123                 return rc;
1124 
1125          /* since no tcon, smb2_init can not do this, so do here */
1126         req->hdr.sync_hdr.SessionId = ses->Suid;
1127 
1128         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1129                 flags |= CIFS_TRANSFORM_REQ;
1130         else if (server->sign)
1131                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1132 
1133         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1134         cifs_small_buf_release(req);
1135         /*
1136          * No tcon so can't do
1137          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1138          */
1139 
1140 smb2_session_already_dead:
1141         return rc;
1142 }
1143 
1144 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1145 {
1146         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1147 }
1148 
1149 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1150 
1151 /* These are similar values to what Windows uses */
1152 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1153 {
1154         tcon->max_chunks = 256;
1155         tcon->max_bytes_chunk = 1048576;
1156         tcon->max_bytes_copy = 16777216;
1157 }
1158 
1159 int
1160 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1161           struct cifs_tcon *tcon, const struct nls_table *cp)
1162 {
1163         struct smb2_tree_connect_req *req;
1164         struct smb2_tree_connect_rsp *rsp = NULL;
1165         struct kvec iov[2];
1166         struct kvec rsp_iov;
1167         int rc = 0;
1168         int resp_buftype;
1169         int unc_path_len;
1170         struct TCP_Server_Info *server;
1171         __le16 *unc_path = NULL;
1172         int flags = 0;
1173 
1174         cifs_dbg(FYI, "TCON\n");
1175 
1176         if ((ses->server) && tree)
1177                 server = ses->server;
1178         else
1179                 return -EIO;
1180 
1181         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1182         if (unc_path == NULL)
1183                 return -ENOMEM;
1184 
1185         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1186         unc_path_len *= 2;
1187         if (unc_path_len < 2) {
1188                 kfree(unc_path);
1189                 return -EINVAL;
1190         }
1191 
1192         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1193         if (tcon)
1194                 tcon->tid = 0;
1195 
1196         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1197         if (rc) {
1198                 kfree(unc_path);
1199                 return rc;
1200         }
1201 
1202         if (tcon == NULL) {
1203                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1204                         flags |= CIFS_TRANSFORM_REQ;
1205 
1206                 /* since no tcon, smb2_init can not do this, so do here */
1207                 req->hdr.sync_hdr.SessionId = ses->Suid;
1208                 if (ses->server->sign)
1209                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1210         } else if (encryption_required(tcon))
1211                 flags |= CIFS_TRANSFORM_REQ;
1212 
1213         iov[0].iov_base = (char *)req;
1214         /* 4 for rfc1002 length field and 1 for pad */
1215         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1216 
1217         /* Testing shows that buffer offset must be at location of Buffer[0] */
1218         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1219                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1220         req->PathLength = cpu_to_le16(unc_path_len - 2);
1221         iov[1].iov_base = unc_path;
1222         iov[1].iov_len = unc_path_len;
1223 
1224         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1225 
1226         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1227         cifs_small_buf_release(req);
1228         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1229 
1230         if (rc != 0) {
1231                 if (tcon) {
1232                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1233                         tcon->need_reconnect = true;
1234                 }
1235                 goto tcon_error_exit;
1236         }
1237 
1238         if (tcon == NULL) {
1239                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1240                 goto tcon_exit;
1241         }
1242 
1243         switch (rsp->ShareType) {
1244         case SMB2_SHARE_TYPE_DISK:
1245                 cifs_dbg(FYI, "connection to disk share\n");
1246                 break;
1247         case SMB2_SHARE_TYPE_PIPE:
1248                 tcon->ipc = true;
1249                 cifs_dbg(FYI, "connection to pipe share\n");
1250                 break;
1251         case SMB2_SHARE_TYPE_PRINT:
1252                 tcon->ipc = true;
1253                 cifs_dbg(FYI, "connection to printer\n");
1254                 break;
1255         default:
1256                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1257                 rc = -EOPNOTSUPP;
1258                 goto tcon_error_exit;
1259         }
1260 
1261         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1262         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1263         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1264         tcon->tidStatus = CifsGood;
1265         tcon->need_reconnect = false;
1266         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1267         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1268 
1269         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1270             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1271                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1272 
1273         if (tcon->seal &&
1274             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1275                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1276 
1277         init_copy_chunk_defaults(tcon);
1278         if (tcon->ses->server->ops->validate_negotiate)
1279                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1280 tcon_exit:
1281         free_rsp_buf(resp_buftype, rsp);
1282         kfree(unc_path);
1283         return rc;
1284 
1285 tcon_error_exit:
1286         if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1287                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1288         }
1289         goto tcon_exit;
1290 }
1291 
1292 int
1293 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1294 {
1295         struct smb2_tree_disconnect_req *req; /* response is trivial */
1296         int rc = 0;
1297         struct TCP_Server_Info *server;
1298         struct cifs_ses *ses = tcon->ses;
1299         int flags = 0;
1300 
1301         cifs_dbg(FYI, "Tree Disconnect\n");
1302 
1303         if (ses && (ses->server))
1304                 server = ses->server;
1305         else
1306                 return -EIO;
1307 
1308         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1309                 return 0;
1310 
1311         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1312         if (rc)
1313                 return rc;
1314 
1315         if (encryption_required(tcon))
1316                 flags |= CIFS_TRANSFORM_REQ;
1317 
1318         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1319         cifs_small_buf_release(req);
1320         if (rc)
1321                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1322 
1323         return rc;
1324 }
1325 
1326 
1327 static struct create_durable *
1328 create_durable_buf(void)
1329 {
1330         struct create_durable *buf;
1331 
1332         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1333         if (!buf)
1334                 return NULL;
1335 
1336         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1337                                         (struct create_durable, Data));
1338         buf->ccontext.DataLength = cpu_to_le32(16);
1339         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1340                                 (struct create_durable, Name));
1341         buf->ccontext.NameLength = cpu_to_le16(4);
1342         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1343         buf->Name[0] = 'D';
1344         buf->Name[1] = 'H';
1345         buf->Name[2] = 'n';
1346         buf->Name[3] = 'Q';
1347         return buf;
1348 }
1349 
1350 static struct create_durable *
1351 create_reconnect_durable_buf(struct cifs_fid *fid)
1352 {
1353         struct create_durable *buf;
1354 
1355         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1356         if (!buf)
1357                 return NULL;
1358 
1359         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1360                                         (struct create_durable, Data));
1361         buf->ccontext.DataLength = cpu_to_le32(16);
1362         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1363                                 (struct create_durable, Name));
1364         buf->ccontext.NameLength = cpu_to_le16(4);
1365         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1366         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1367         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1368         buf->Name[0] = 'D';
1369         buf->Name[1] = 'H';
1370         buf->Name[2] = 'n';
1371         buf->Name[3] = 'C';
1372         return buf;
1373 }
1374 
1375 static __u8
1376 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1377                   unsigned int *epoch)
1378 {
1379         char *data_offset;
1380         struct create_context *cc;
1381         unsigned int next;
1382         unsigned int remaining;
1383         char *name;
1384 
1385         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1386         remaining = le32_to_cpu(rsp->CreateContextsLength);
1387         cc = (struct create_context *)data_offset;
1388         while (remaining >= sizeof(struct create_context)) {
1389                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1390                 if (le16_to_cpu(cc->NameLength) == 4 &&
1391                     strncmp(name, "RqLs", 4) == 0)
1392                         return server->ops->parse_lease_buf(cc, epoch);
1393 
1394                 next = le32_to_cpu(cc->Next);
1395                 if (!next)
1396                         break;
1397                 remaining -= next;
1398                 cc = (struct create_context *)((char *)cc + next);
1399         }
1400 
1401         return 0;
1402 }
1403 
1404 static int
1405 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1406                   unsigned int *num_iovec, __u8 *oplock)
1407 {
1408         struct smb2_create_req *req = iov[0].iov_base;
1409         unsigned int num = *num_iovec;
1410 
1411         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1412         if (iov[num].iov_base == NULL)
1413                 return -ENOMEM;
1414         iov[num].iov_len = server->vals->create_lease_size;
1415         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1416         if (!req->CreateContextsOffset)
1417                 req->CreateContextsOffset = cpu_to_le32(
1418                                 sizeof(struct smb2_create_req) - 4 +
1419                                 iov[num - 1].iov_len);
1420         le32_add_cpu(&req->CreateContextsLength,
1421                      server->vals->create_lease_size);
1422         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1423         *num_iovec = num + 1;
1424         return 0;
1425 }
1426 
1427 static struct create_durable_v2 *
1428 create_durable_v2_buf(struct cifs_fid *pfid)
1429 {
1430         struct create_durable_v2 *buf;
1431 
1432         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1433         if (!buf)
1434                 return NULL;
1435 
1436         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1437                                         (struct create_durable_v2, dcontext));
1438         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1439         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1440                                 (struct create_durable_v2, Name));
1441         buf->ccontext.NameLength = cpu_to_le16(4);
1442 
1443         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1444         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1445         generate_random_uuid(buf->dcontext.CreateGuid);
1446         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1447 
1448         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1449         buf->Name[0] = 'D';
1450         buf->Name[1] = 'H';
1451         buf->Name[2] = '2';
1452         buf->Name[3] = 'Q';
1453         return buf;
1454 }
1455 
1456 static struct create_durable_handle_reconnect_v2 *
1457 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1458 {
1459         struct create_durable_handle_reconnect_v2 *buf;
1460 
1461         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1462                         GFP_KERNEL);
1463         if (!buf)
1464                 return NULL;
1465 
1466         buf->ccontext.DataOffset =
1467                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1468                                      dcontext));
1469         buf->ccontext.DataLength =
1470                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1471         buf->ccontext.NameOffset =
1472                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1473                             Name));
1474         buf->ccontext.NameLength = cpu_to_le16(4);
1475 
1476         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1477         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1478         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1479         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1480 
1481         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1482         buf->Name[0] = 'D';
1483         buf->Name[1] = 'H';
1484         buf->Name[2] = '2';
1485         buf->Name[3] = 'C';
1486         return buf;
1487 }
1488 
1489 static int
1490 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1491                     struct cifs_open_parms *oparms)
1492 {
1493         struct smb2_create_req *req = iov[0].iov_base;
1494         unsigned int num = *num_iovec;
1495 
1496         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1497         if (iov[num].iov_base == NULL)
1498                 return -ENOMEM;
1499         iov[num].iov_len = sizeof(struct create_durable_v2);
1500         if (!req->CreateContextsOffset)
1501                 req->CreateContextsOffset =
1502                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1503                                                                 iov[1].iov_len);
1504         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1505         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1506         *num_iovec = num + 1;
1507         return 0;
1508 }
1509 
1510 static int
1511 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1512                     struct cifs_open_parms *oparms)
1513 {
1514         struct smb2_create_req *req = iov[0].iov_base;
1515         unsigned int num = *num_iovec;
1516 
1517         /* indicate that we don't need to relock the file */
1518         oparms->reconnect = false;
1519 
1520         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1521         if (iov[num].iov_base == NULL)
1522                 return -ENOMEM;
1523         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1524         if (!req->CreateContextsOffset)
1525                 req->CreateContextsOffset =
1526                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1527                                                                 iov[1].iov_len);
1528         le32_add_cpu(&req->CreateContextsLength,
1529                         sizeof(struct create_durable_handle_reconnect_v2));
1530         inc_rfc1001_len(&req->hdr,
1531                         sizeof(struct create_durable_handle_reconnect_v2));
1532         *num_iovec = num + 1;
1533         return 0;
1534 }
1535 
1536 static int
1537 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1538                     struct cifs_open_parms *oparms, bool use_persistent)
1539 {
1540         struct smb2_create_req *req = iov[0].iov_base;
1541         unsigned int num = *num_iovec;
1542 
1543         if (use_persistent) {
1544                 if (oparms->reconnect)
1545                         return add_durable_reconnect_v2_context(iov, num_iovec,
1546                                                                 oparms);
1547                 else
1548                         return add_durable_v2_context(iov, num_iovec, oparms);
1549         }
1550 
1551         if (oparms->reconnect) {
1552                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1553                 /* indicate that we don't need to relock the file */
1554                 oparms->reconnect = false;
1555         } else
1556                 iov[num].iov_base = create_durable_buf();
1557         if (iov[num].iov_base == NULL)
1558                 return -ENOMEM;
1559         iov[num].iov_len = sizeof(struct create_durable);
1560         if (!req->CreateContextsOffset)
1561                 req->CreateContextsOffset =
1562                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1563                                                                 iov[1].iov_len);
1564         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1565         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1566         *num_iovec = num + 1;
1567         return 0;
1568 }
1569 
1570 static int
1571 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1572                             const char *treename, const __le16 *path)
1573 {
1574         int treename_len, path_len;
1575         struct nls_table *cp;
1576         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1577 
1578         /*
1579          * skip leading "\\"
1580          */
1581         treename_len = strlen(treename);
1582         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1583                 return -EINVAL;
1584 
1585         treename += 2;
1586         treename_len -= 2;
1587 
1588         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1589 
1590         /*
1591          * make room for one path separator between the treename and
1592          * path
1593          */
1594         *out_len = treename_len + 1 + path_len;
1595 
1596         /*
1597          * final path needs to be null-terminated UTF16 with a
1598          * size aligned to 8
1599          */
1600 
1601         *out_size = roundup((*out_len+1)*2, 8);
1602         *out_path = kzalloc(*out_size, GFP_KERNEL);
1603         if (!*out_path)
1604                 return -ENOMEM;
1605 
1606         cp = load_nls_default();
1607         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1608         UniStrcat(*out_path, sep);
1609         UniStrcat(*out_path, path);
1610         unload_nls(cp);
1611 
1612         return 0;
1613 }
1614 
1615 int
1616 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1617           __u8 *oplock, struct smb2_file_all_info *buf,
1618           struct smb2_err_rsp **err_buf)
1619 {
1620         struct smb2_create_req *req;
1621         struct smb2_create_rsp *rsp;
1622         struct TCP_Server_Info *server;
1623         struct cifs_tcon *tcon = oparms->tcon;
1624         struct cifs_ses *ses = tcon->ses;
1625         struct kvec iov[4];
1626         struct kvec rsp_iov;
1627         int resp_buftype;
1628         int uni_path_len;
1629         __le16 *copy_path = NULL;
1630         int copy_size;
1631         int rc = 0;
1632         unsigned int n_iov = 2;
1633         __u32 file_attributes = 0;
1634         char *dhc_buf = NULL, *lc_buf = NULL;
1635         int flags = 0;
1636 
1637         cifs_dbg(FYI, "create/open\n");
1638 
1639         if (ses && (ses->server))
1640                 server = ses->server;
1641         else
1642                 return -EIO;
1643 
1644         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1645         if (rc)
1646                 return rc;
1647 
1648         if (encryption_required(tcon))
1649                 flags |= CIFS_TRANSFORM_REQ;
1650 
1651         if (oparms->create_options & CREATE_OPTION_READONLY)
1652                 file_attributes |= ATTR_READONLY;
1653         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1654                 file_attributes |= ATTR_SYSTEM;
1655 
1656         req->ImpersonationLevel = IL_IMPERSONATION;
1657         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1658         /* File attributes ignored on open (used in create though) */
1659         req->FileAttributes = cpu_to_le32(file_attributes);
1660         req->ShareAccess = FILE_SHARE_ALL_LE;
1661         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1662         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1663 
1664         iov[0].iov_base = (char *)req;
1665         /* 4 for rfc1002 length field */
1666         iov[0].iov_len = get_rfc1002_length(req) + 4;
1667         /* -1 since last byte is buf[0] which is sent below (path) */
1668         iov[0].iov_len--;
1669 
1670         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1671 
1672         /* [MS-SMB2] 2.2.13 NameOffset:
1673          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1674          * the SMB2 header, the file name includes a prefix that will
1675          * be processed during DFS name normalization as specified in
1676          * section 3.3.5.9. Otherwise, the file name is relative to
1677          * the share that is identified by the TreeId in the SMB2
1678          * header.
1679          */
1680         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1681                 int name_len;
1682 
1683                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1684                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1685                                                  &name_len,
1686                                                  tcon->treeName, path);
1687                 if (rc)
1688                         return rc;
1689                 req->NameLength = cpu_to_le16(name_len * 2);
1690                 uni_path_len = copy_size;
1691                 path = copy_path;
1692         } else {
1693                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1694                 /* MUST set path len (NameLength) to 0 opening root of share */
1695                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1696                 if (uni_path_len % 8 != 0) {
1697                         copy_size = roundup(uni_path_len, 8);
1698                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1699                         if (!copy_path)
1700                                 return -ENOMEM;
1701                         memcpy((char *)copy_path, (const char *)path,
1702                                uni_path_len);
1703                         uni_path_len = copy_size;
1704                         path = copy_path;
1705                 }
1706         }
1707 
1708         iov[1].iov_len = uni_path_len;
1709         iov[1].iov_base = path;
1710         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1711         inc_rfc1001_len(req, uni_path_len - 1);
1712 
1713         if (!server->oplocks)
1714                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1715 
1716         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1717             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1718                 req->RequestedOplockLevel = *oplock;
1719         else {
1720                 rc = add_lease_context(server, iov, &n_iov, oplock);
1721                 if (rc) {
1722                         cifs_small_buf_release(req);
1723                         kfree(copy_path);
1724                         return rc;
1725                 }
1726                 lc_buf = iov[n_iov-1].iov_base;
1727         }
1728 
1729         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1730                 /* need to set Next field of lease context if we request it */
1731                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1732                         struct create_context *ccontext =
1733                             (struct create_context *)iov[n_iov-1].iov_base;
1734                         ccontext->Next =
1735                                 cpu_to_le32(server->vals->create_lease_size);
1736                 }
1737 
1738                 rc = add_durable_context(iov, &n_iov, oparms,
1739                                         tcon->use_persistent);
1740                 if (rc) {
1741                         cifs_small_buf_release(req);
1742                         kfree(copy_path);
1743                         kfree(lc_buf);
1744                         return rc;
1745                 }
1746                 dhc_buf = iov[n_iov-1].iov_base;
1747         }
1748 
1749         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1750         cifs_small_buf_release(req);
1751         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1752 
1753         if (rc != 0) {
1754                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1755                 if (err_buf)
1756                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1757                                            GFP_KERNEL);
1758                 goto creat_exit;
1759         }
1760 
1761         oparms->fid->persistent_fid = rsp->PersistentFileId;
1762         oparms->fid->volatile_fid = rsp->VolatileFileId;
1763 
1764         if (buf) {
1765                 memcpy(buf, &rsp->CreationTime, 32);
1766                 buf->AllocationSize = rsp->AllocationSize;
1767                 buf->EndOfFile = rsp->EndofFile;
1768                 buf->Attributes = rsp->FileAttributes;
1769                 buf->NumberOfLinks = cpu_to_le32(1);
1770                 buf->DeletePending = 0;
1771         }
1772 
1773         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1774                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1775         else
1776                 *oplock = rsp->OplockLevel;
1777 creat_exit:
1778         kfree(copy_path);
1779         kfree(lc_buf);
1780         kfree(dhc_buf);
1781         free_rsp_buf(resp_buftype, rsp);
1782         return rc;
1783 }
1784 
1785 /*
1786  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1787  */
1788 int
1789 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1790            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1791            char *in_data, u32 indatalen,
1792            char **out_data, u32 *plen /* returned data len */)
1793 {
1794         struct smb2_ioctl_req *req;
1795         struct smb2_ioctl_rsp *rsp;
1796         struct smb2_sync_hdr *shdr;
1797         struct TCP_Server_Info *server;
1798         struct cifs_ses *ses;
1799         struct kvec iov[2];
1800         struct kvec rsp_iov;
1801         int resp_buftype;
1802         int n_iov;
1803         int rc = 0;
1804         int flags = 0;
1805 
1806         cifs_dbg(FYI, "SMB2 IOCTL\n");
1807 
1808         if (out_data != NULL)
1809                 *out_data = NULL;
1810 
1811         /* zero out returned data len, in case of error */
1812         if (plen)
1813                 *plen = 0;
1814 
1815         if (tcon)
1816                 ses = tcon->ses;
1817         else
1818                 return -EIO;
1819 
1820         if (ses && (ses->server))
1821                 server = ses->server;
1822         else
1823                 return -EIO;
1824 
1825         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1826         if (rc)
1827                 return rc;
1828 
1829         if (use_ipc) {
1830                 if (ses->ipc_tid == 0) {
1831                         cifs_small_buf_release(req);
1832                         return -ENOTCONN;
1833                 }
1834 
1835                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1836                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1837                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1838         }
1839         if (encryption_required(tcon))
1840                 flags |= CIFS_TRANSFORM_REQ;
1841 
1842         req->CtlCode = cpu_to_le32(opcode);
1843         req->PersistentFileId = persistent_fid;
1844         req->VolatileFileId = volatile_fid;
1845 
1846         if (indatalen) {
1847                 req->InputCount = cpu_to_le32(indatalen);
1848                 /* do not set InputOffset if no input data */
1849                 req->InputOffset =
1850                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1851                 iov[1].iov_base = in_data;
1852                 iov[1].iov_len = indatalen;
1853                 n_iov = 2;
1854         } else
1855                 n_iov = 1;
1856 
1857         req->OutputOffset = 0;
1858         req->OutputCount = 0; /* MBZ */
1859 
1860         /*
1861          * Could increase MaxOutputResponse, but that would require more
1862          * than one credit. Windows typically sets this smaller, but for some
1863          * ioctls it may be useful to allow server to send more. No point
1864          * limiting what the server can send as long as fits in one credit
1865          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1866          * (by default, note that it can be overridden to make max larger)
1867          * in responses (except for read responses which can be bigger.
1868          * We may want to bump this limit up
1869          */
1870         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1871 
1872         if (is_fsctl)
1873                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1874         else
1875                 req->Flags = 0;
1876 
1877         iov[0].iov_base = (char *)req;
1878 
1879         /*
1880          * If no input data, the size of ioctl struct in
1881          * protocol spec still includes a 1 byte data buffer,
1882          * but if input data passed to ioctl, we do not
1883          * want to double count this, so we do not send
1884          * the dummy one byte of data in iovec[0] if sending
1885          * input data (in iovec[1]). We also must add 4 bytes
1886          * in first iovec to allow for rfc1002 length field.
1887          */
1888 
1889         if (indatalen) {
1890                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1891                 inc_rfc1001_len(req, indatalen - 1);
1892         } else
1893                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1894 
1895 
1896         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1897         cifs_small_buf_release(req);
1898         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1899 
1900         if ((rc != 0) && (rc != -EINVAL)) {
1901                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1902                 goto ioctl_exit;
1903         } else if (rc == -EINVAL) {
1904                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1905                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1906                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1907                         goto ioctl_exit;
1908                 }
1909         }
1910 
1911         /* check if caller wants to look at return data or just return rc */
1912         if ((plen == NULL) || (out_data == NULL))
1913                 goto ioctl_exit;
1914 
1915         *plen = le32_to_cpu(rsp->OutputCount);
1916 
1917         /* We check for obvious errors in the output buffer length and offset */
1918         if (*plen == 0)
1919                 goto ioctl_exit; /* server returned no data */
1920         else if (*plen > 0xFF00) {
1921                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1922                 *plen = 0;
1923                 rc = -EIO;
1924                 goto ioctl_exit;
1925         }
1926 
1927         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1928                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1929                         le32_to_cpu(rsp->OutputOffset));
1930                 *plen = 0;
1931                 rc = -EIO;
1932                 goto ioctl_exit;
1933         }
1934 
1935         *out_data = kmalloc(*plen, GFP_KERNEL);
1936         if (*out_data == NULL) {
1937                 rc = -ENOMEM;
1938                 goto ioctl_exit;
1939         }
1940 
1941         shdr = get_sync_hdr(rsp);
1942         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1943 ioctl_exit:
1944         free_rsp_buf(resp_buftype, rsp);
1945         return rc;
1946 }
1947 
1948 /*
1949  *   Individual callers to ioctl worker function follow
1950  */
1951 
1952 int
1953 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1954                      u64 persistent_fid, u64 volatile_fid)
1955 {
1956         int rc;
1957         struct  compress_ioctl fsctl_input;
1958         char *ret_data = NULL;
1959 
1960         fsctl_input.CompressionState =
1961                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1962 
1963         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1964                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1965                         false /* use_ipc */,
1966                         (char *)&fsctl_input /* data input */,
1967                         2 /* in data len */, &ret_data /* out data */, NULL);
1968 
1969         cifs_dbg(FYI, "set compression rc %d\n", rc);
1970 
1971         return rc;
1972 }
1973 
1974 int
1975 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1976            u64 persistent_fid, u64 volatile_fid)
1977 {
1978         struct smb2_close_req *req;
1979         struct smb2_close_rsp *rsp;
1980         struct TCP_Server_Info *server;
1981         struct cifs_ses *ses = tcon->ses;
1982         struct kvec iov[1];
1983         struct kvec rsp_iov;
1984         int resp_buftype;
1985         int rc = 0;
1986         int flags = 0;
1987 
1988         cifs_dbg(FYI, "Close\n");
1989 
1990         if (ses && (ses->server))
1991                 server = ses->server;
1992         else
1993                 return -EIO;
1994 
1995         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1996         if (rc)
1997                 return rc;
1998 
1999         if (encryption_required(tcon))
2000                 flags |= CIFS_TRANSFORM_REQ;
2001 
2002         req->PersistentFileId = persistent_fid;
2003         req->VolatileFileId = volatile_fid;
2004 
2005         iov[0].iov_base = (char *)req;
2006         /* 4 for rfc1002 length field */
2007         iov[0].iov_len = get_rfc1002_length(req) + 4;
2008 
2009         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2010         cifs_small_buf_release(req);
2011         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2012 
2013         if (rc != 0) {
2014                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2015                 goto close_exit;
2016         }
2017 
2018         /* BB FIXME - decode close response, update inode for caching */
2019 
2020 close_exit:
2021         free_rsp_buf(resp_buftype, rsp);
2022         return rc;
2023 }
2024 
2025 static int
2026 validate_buf(unsigned int offset, unsigned int buffer_length,
2027              struct smb2_hdr *hdr, unsigned int min_buf_size)
2028 
2029 {
2030         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2031         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2032         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2033         char *end_of_buf = begin_of_buf + buffer_length;
2034 
2035 
2036         if (buffer_length < min_buf_size) {
2037                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2038                          buffer_length, min_buf_size);
2039                 return -EINVAL;
2040         }
2041 
2042         /* check if beyond RFC1001 maximum length */
2043         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2044                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2045                          buffer_length, smb_len);
2046                 return -EINVAL;
2047         }
2048 
2049         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2050                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2051                 return -EINVAL;
2052         }
2053 
2054         return 0;
2055 }
2056 
2057 /*
2058  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2059  * Caller must free buffer.
2060  */
2061 static int
2062 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2063                       struct smb2_hdr *hdr, unsigned int minbufsize,
2064                       char *data)
2065 
2066 {
2067         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2068         int rc;
2069 
2070         if (!data)
2071                 return -EINVAL;
2072 
2073         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2074         if (rc)
2075                 return rc;
2076 
2077         memcpy(data, begin_of_buf, buffer_length);
2078 
2079         return 0;
2080 }
2081 
2082 static int
2083 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2084            u64 persistent_fid, u64 volatile_fid, u8 info_class,
2085            size_t output_len, size_t min_len, void *data)
2086 {
2087         struct smb2_query_info_req *req;
2088         struct smb2_query_info_rsp *rsp = NULL;
2089         struct kvec iov[2];
2090         struct kvec rsp_iov;
2091         int rc = 0;
2092         int resp_buftype;
2093         struct TCP_Server_Info *server;
2094         struct cifs_ses *ses = tcon->ses;
2095         int flags = 0;
2096 
2097         cifs_dbg(FYI, "Query Info\n");
2098 
2099         if (ses && (ses->server))
2100                 server = ses->server;
2101         else
2102                 return -EIO;
2103 
2104         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2105         if (rc)
2106                 return rc;
2107 
2108         if (encryption_required(tcon))
2109                 flags |= CIFS_TRANSFORM_REQ;
2110 
2111         req->InfoType = SMB2_O_INFO_FILE;
2112         req->FileInfoClass = info_class;
2113         req->PersistentFileId = persistent_fid;
2114         req->VolatileFileId = volatile_fid;
2115         /* 4 for rfc1002 length field and 1 for Buffer */
2116         req->InputBufferOffset =
2117                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2118         req->OutputBufferLength = cpu_to_le32(output_len);
2119 
2120         iov[0].iov_base = (char *)req;
2121         /* 4 for rfc1002 length field */
2122         iov[0].iov_len = get_rfc1002_length(req) + 4;
2123 
2124         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2125         cifs_small_buf_release(req);
2126         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2127 
2128         if (rc) {
2129                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2130                 goto qinf_exit;
2131         }
2132 
2133         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2134                                    le32_to_cpu(rsp->OutputBufferLength),
2135                                    &rsp->hdr, min_len, data);
2136 
2137 qinf_exit:
2138         free_rsp_buf(resp_buftype, rsp);
2139         return rc;
2140 }
2141 
2142 int
2143 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2144                 u64 persistent_fid, u64 volatile_fid,
2145                 struct smb2_file_all_info *data)
2146 {
2147         return query_info(xid, tcon, persistent_fid, volatile_fid,
2148                           FILE_ALL_INFORMATION,
2149                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2150                           sizeof(struct smb2_file_all_info), data);
2151 }
2152 
2153 int
2154 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2155                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2156 {
2157         return query_info(xid, tcon, persistent_fid, volatile_fid,
2158                           FILE_INTERNAL_INFORMATION,
2159                           sizeof(struct smb2_file_internal_info),
2160                           sizeof(struct smb2_file_internal_info), uniqueid);
2161 }
2162 
2163 /*
2164  * This is a no-op for now. We're not really interested in the reply, but
2165  * rather in the fact that the server sent one and that server->lstrp
2166  * gets updated.
2167  *
2168  * FIXME: maybe we should consider checking that the reply matches request?
2169  */
2170 static void
2171 smb2_echo_callback(struct mid_q_entry *mid)
2172 {
2173         struct TCP_Server_Info *server = mid->callback_data;
2174         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2175         unsigned int credits_received = 1;
2176 
2177         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2178                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2179 
2180         DeleteMidQEntry(mid);
2181         add_credits(server, credits_received, CIFS_ECHO_OP);
2182 }
2183 
2184 void smb2_reconnect_server(struct work_struct *work)
2185 {
2186         struct TCP_Server_Info *server = container_of(work,
2187                                         struct TCP_Server_Info, reconnect.work);
2188         struct cifs_ses *ses;
2189         struct cifs_tcon *tcon, *tcon2;
2190         struct list_head tmp_list;
2191         int tcon_exist = false;
2192         int rc;
2193         int resched = false;
2194 
2195 
2196         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2197         mutex_lock(&server->reconnect_mutex);
2198 
2199         INIT_LIST_HEAD(&tmp_list);
2200         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2201 
2202         spin_lock(&cifs_tcp_ses_lock);
2203         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2204                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2205                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2206                                 tcon->tc_count++;
2207                                 list_add_tail(&tcon->rlist, &tmp_list);
2208                                 tcon_exist = true;
2209                         }
2210                 }
2211         }
2212         /*
2213          * Get the reference to server struct to be sure that the last call of
2214          * cifs_put_tcon() in the loop below won't release the server pointer.
2215          */
2216         if (tcon_exist)
2217                 server->srv_count++;
2218 
2219         spin_unlock(&cifs_tcp_ses_lock);
2220 
2221         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2222                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2223                 if (!rc)
2224                         cifs_reopen_persistent_handles(tcon);
2225                 else
2226                         resched = true;
2227                 list_del_init(&tcon->rlist);
2228                 cifs_put_tcon(tcon);
2229         }
2230 
2231         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2232         if (resched)
2233                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2234         mutex_unlock(&server->reconnect_mutex);
2235 
2236         /* now we can safely release srv struct */
2237         if (tcon_exist)
2238                 cifs_put_tcp_session(server, 1);
2239 }
2240 
2241 int
2242 SMB2_echo(struct TCP_Server_Info *server)
2243 {
2244         struct smb2_echo_req *req;
2245         int rc = 0;
2246         struct kvec iov[2];
2247         struct smb_rqst rqst = { .rq_iov = iov,
2248                                  .rq_nvec = 2 };
2249 
2250         cifs_dbg(FYI, "In echo request\n");
2251 
2252         if (server->tcpStatus == CifsNeedNegotiate) {
2253                 /* No need to send echo on newly established connections */
2254                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2255                 return rc;
2256         }
2257 
2258         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2259         if (rc)
2260                 return rc;
2261 
2262         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2263 
2264         /* 4 for rfc1002 length field */
2265         iov[0].iov_len = 4;
2266         iov[0].iov_base = (char *)req;
2267         iov[1].iov_len = get_rfc1002_length(req);
2268         iov[1].iov_base = (char *)req + 4;
2269 
2270         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2271                              server, CIFS_ECHO_OP);
2272         if (rc)
2273                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2274 
2275         cifs_small_buf_release(req);
2276         return rc;
2277 }
2278 
2279 int
2280 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2281            u64 volatile_fid)
2282 {
2283         struct smb2_flush_req *req;
2284         struct TCP_Server_Info *server;
2285         struct cifs_ses *ses = tcon->ses;
2286         struct kvec iov[1];
2287         struct kvec rsp_iov;
2288         int resp_buftype;
2289         int rc = 0;
2290         int flags = 0;
2291 
2292         cifs_dbg(FYI, "Flush\n");
2293 
2294         if (ses && (ses->server))
2295                 server = ses->server;
2296         else
2297                 return -EIO;
2298 
2299         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2300         if (rc)
2301                 return rc;
2302 
2303         if (encryption_required(tcon))
2304                 flags |= CIFS_TRANSFORM_REQ;
2305 
2306         req->PersistentFileId = persistent_fid;
2307         req->VolatileFileId = volatile_fid;
2308 
2309         iov[0].iov_base = (char *)req;
2310         /* 4 for rfc1002 length field */
2311         iov[0].iov_len = get_rfc1002_length(req) + 4;
2312 
2313         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2314         cifs_small_buf_release(req);
2315 
2316         if (rc != 0)
2317                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2318 
2319         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2320         return rc;
2321 }
2322 
2323 /*
2324  * To form a chain of read requests, any read requests after the first should
2325  * have the end_of_chain boolean set to true.
2326  */
2327 static int
2328 smb2_new_read_req(void **buf, unsigned int *total_len,
2329                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2330                   int request_type)
2331 {
2332         int rc = -EACCES;
2333         struct smb2_read_plain_req *req = NULL;
2334         struct smb2_sync_hdr *shdr;
2335 
2336         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2337                                  total_len);
2338         if (rc)
2339                 return rc;
2340         if (io_parms->tcon->ses->server == NULL)
2341                 return -ECONNABORTED;
2342 
2343         shdr = &req->sync_hdr;
2344         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2345 
2346         req->PersistentFileId = io_parms->persistent_fid;
2347         req->VolatileFileId = io_parms->volatile_fid;
2348         req->ReadChannelInfoOffset = 0; /* reserved */
2349         req->ReadChannelInfoLength = 0; /* reserved */
2350         req->Channel = 0; /* reserved */
2351         req->MinimumCount = 0;
2352         req->Length = cpu_to_le32(io_parms->length);
2353         req->Offset = cpu_to_le64(io_parms->offset);
2354 
2355         if (request_type & CHAINED_REQUEST) {
2356                 if (!(request_type & END_OF_CHAIN)) {
2357                         /* next 8-byte aligned request */
2358                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2359                         shdr->NextCommand = cpu_to_le32(*total_len);
2360                 } else /* END_OF_CHAIN */
2361                         shdr->NextCommand = 0;
2362                 if (request_type & RELATED_REQUEST) {
2363                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2364                         /*
2365                          * Related requests use info from previous read request
2366                          * in chain.
2367                          */
2368                         shdr->SessionId = 0xFFFFFFFF;
2369                         shdr->TreeId = 0xFFFFFFFF;
2370                         req->PersistentFileId = 0xFFFFFFFF;
2371                         req->VolatileFileId = 0xFFFFFFFF;
2372                 }
2373         }
2374         if (remaining_bytes > io_parms->length)
2375                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2376         else
2377                 req->RemainingBytes = 0;
2378 
2379         *buf = req;
2380         return rc;
2381 }
2382 
2383 static void
2384 smb2_readv_callback(struct mid_q_entry *mid)
2385 {
2386         struct cifs_readdata *rdata = mid->callback_data;
2387         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2388         struct TCP_Server_Info *server = tcon->ses->server;
2389         struct smb2_sync_hdr *shdr =
2390                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2391         unsigned int credits_received = 1;
2392         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2393                                  .rq_nvec = 2,
2394                                  .rq_pages = rdata->pages,
2395                                  .rq_npages = rdata->nr_pages,
2396                                  .rq_pagesz = rdata->pagesz,
2397                                  .rq_tailsz = rdata->tailsz };
2398 
2399         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2400                  __func__, mid->mid, mid->mid_state, rdata->result,
2401                  rdata->bytes);
2402 
2403         switch (mid->mid_state) {
2404         case MID_RESPONSE_RECEIVED:
2405                 credits_received = le16_to_cpu(shdr->CreditRequest);
2406                 /* result already set, check signature */
2407                 if (server->sign && !mid->decrypted) {
2408                         int rc;
2409 
2410                         rc = smb2_verify_signature(&rqst, server);
2411                         if (rc)
2412                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2413                                          rc);
2414                 }
2415                 /* FIXME: should this be counted toward the initiating task? */
2416                 task_io_account_read(rdata->got_bytes);
2417                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2418                 break;
2419         case MID_REQUEST_SUBMITTED:
2420         case MID_RETRY_NEEDED:
2421                 rdata->result = -EAGAIN;
2422                 if (server->sign && rdata->got_bytes)
2423                         /* reset bytes number since we can not check a sign */
2424                         rdata->got_bytes = 0;
2425                 /* FIXME: should this be counted toward the initiating task? */
2426                 task_io_account_read(rdata->got_bytes);
2427                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2428                 break;
2429         default:
2430                 if (rdata->result != -ENODATA)
2431                         rdata->result = -EIO;
2432         }
2433 
2434         if (rdata->result)
2435                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2436 
2437         queue_work(cifsiod_wq, &rdata->work);
2438         DeleteMidQEntry(mid);
2439         add_credits(server, credits_received, 0);
2440 }
2441 
2442 /* smb2_async_readv - send an async read, and set up mid to handle result */
2443 int
2444 smb2_async_readv(struct cifs_readdata *rdata)
2445 {
2446         int rc, flags = 0;
2447         char *buf;
2448         struct smb2_sync_hdr *shdr;
2449         struct cifs_io_parms io_parms;
2450         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2451                                  .rq_nvec = 2 };
2452         struct TCP_Server_Info *server;
2453         unsigned int total_len;
2454         __be32 req_len;
2455 
2456         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2457                  __func__, rdata->offset, rdata->bytes);
2458 
2459         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2460         io_parms.offset = rdata->offset;
2461         io_parms.length = rdata->bytes;
2462         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2463         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2464         io_parms.pid = rdata->pid;
2465 
2466         server = io_parms.tcon->ses->server;
2467 
2468         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2469         if (rc) {
2470                 if (rc == -EAGAIN && rdata->credits) {
2471                         /* credits was reset by reconnect */
2472                         rdata->credits = 0;
2473                         /* reduce in_flight value since we won't send the req */
2474                         spin_lock(&server->req_lock);
2475                         server->in_flight--;
2476                         spin_unlock(&server->req_lock);
2477                 }
2478                 return rc;
2479         }
2480 
2481         if (encryption_required(io_parms.tcon))
2482                 flags |= CIFS_TRANSFORM_REQ;
2483 
2484         req_len = cpu_to_be32(total_len);
2485 
2486         rdata->iov[0].iov_base = &req_len;
2487         rdata->iov[0].iov_len = sizeof(__be32);
2488         rdata->iov[1].iov_base = buf;
2489         rdata->iov[1].iov_len = total_len;
2490 
2491         shdr = (struct smb2_sync_hdr *)buf;
2492 
2493         if (rdata->credits) {
2494                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2495                                                 SMB2_MAX_BUFFER_SIZE));
2496                 shdr->CreditRequest = shdr->CreditCharge;
2497                 spin_lock(&server->req_lock);
2498                 server->credits += rdata->credits -
2499                                                 le16_to_cpu(shdr->CreditCharge);
2500                 spin_unlock(&server->req_lock);
2501                 wake_up(&server->request_q);
2502                 flags |= CIFS_HAS_CREDITS;
2503         }
2504 
2505         kref_get(&rdata->refcount);
2506         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2507                              cifs_readv_receive, smb2_readv_callback,
2508                              smb3_handle_read_data, rdata, flags);
2509         if (rc) {
2510                 kref_put(&rdata->refcount, cifs_readdata_release);
2511                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2512         }
2513 
2514         cifs_small_buf_release(buf);
2515         return rc;
2516 }
2517 
2518 int
2519 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2520           unsigned int *nbytes, char **buf, int *buf_type)
2521 {
2522         int resp_buftype, rc = -EACCES;
2523         struct smb2_read_plain_req *req = NULL;
2524         struct smb2_read_rsp *rsp = NULL;
2525         struct smb2_sync_hdr *shdr;
2526         struct kvec iov[2];
2527         struct kvec rsp_iov;
2528         unsigned int total_len;
2529         __be32 req_len;
2530         struct smb_rqst rqst = { .rq_iov = iov,
2531                                  .rq_nvec = 2 };
2532         int flags = CIFS_LOG_ERROR;
2533         struct cifs_ses *ses = io_parms->tcon->ses;
2534 
2535         *nbytes = 0;
2536         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2537         if (rc)
2538                 return rc;
2539 
2540         if (encryption_required(io_parms->tcon))
2541                 flags |= CIFS_TRANSFORM_REQ;
2542 
2543         req_len = cpu_to_be32(total_len);
2544 
2545         iov[0].iov_base = &req_len;
2546         iov[0].iov_len = sizeof(__be32);
2547         iov[1].iov_base = req;
2548         iov[1].iov_len = total_len;
2549 
2550         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2551         cifs_small_buf_release(req);
2552 
2553         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2554         shdr = get_sync_hdr(rsp);
2555 
2556         if (shdr->Status == STATUS_END_OF_FILE) {
2557                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2558                 return 0;
2559         }
2560 
2561         if (rc) {
2562                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2563                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2564         } else {
2565                 *nbytes = le32_to_cpu(rsp->DataLength);
2566                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2567                     (*nbytes > io_parms->length)) {
2568                         cifs_dbg(FYI, "bad length %d for count %d\n",
2569                                  *nbytes, io_parms->length);
2570                         rc = -EIO;
2571                         *nbytes = 0;
2572                 }
2573         }
2574 
2575         if (*buf) {
2576                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2577                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2578         } else if (resp_buftype != CIFS_NO_BUFFER) {
2579                 *buf = rsp_iov.iov_base;
2580                 if (resp_buftype == CIFS_SMALL_BUFFER)
2581                         *buf_type = CIFS_SMALL_BUFFER;
2582                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2583                         *buf_type = CIFS_LARGE_BUFFER;
2584         }
2585         return rc;
2586 }
2587 
2588 /*
2589  * Check the mid_state and signature on received buffer (if any), and queue the
2590  * workqueue completion task.
2591  */
2592 static void
2593 smb2_writev_callback(struct mid_q_entry *mid)
2594 {
2595         struct cifs_writedata *wdata = mid->callback_data;
2596         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2597         unsigned int written;
2598         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2599         unsigned int credits_received = 1;
2600 
2601         switch (mid->mid_state) {
2602         case MID_RESPONSE_RECEIVED:
2603                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2604                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2605                 if (wdata->result != 0)
2606                         break;
2607 
2608                 written = le32_to_cpu(rsp->DataLength);
2609                 /*
2610                  * Mask off high 16 bits when bytes written as returned
2611                  * by the server is greater than bytes requested by the
2612                  * client. OS/2 servers are known to set incorrect
2613                  * CountHigh values.
2614                  */
2615                 if (written > wdata->bytes)
2616                         written &= 0xFFFF;
2617 
2618                 if (written < wdata->bytes)
2619                         wdata->result = -ENOSPC;
2620                 else
2621                         wdata->bytes = written;
2622                 break;
2623         case MID_REQUEST_SUBMITTED:
2624         case MID_RETRY_NEEDED:
2625                 wdata->result = -EAGAIN;
2626                 break;
2627         default:
2628                 wdata->result = -EIO;
2629                 break;
2630         }
2631 
2632         if (wdata->result)
2633                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2634 
2635         queue_work(cifsiod_wq, &wdata->work);
2636         DeleteMidQEntry(mid);
2637         add_credits(tcon->ses->server, credits_received, 0);
2638 }
2639 
2640 /* smb2_async_writev - send an async write, and set up mid to handle result */
2641 int
2642 smb2_async_writev(struct cifs_writedata *wdata,
2643                   void (*release)(struct kref *kref))
2644 {
2645         int rc = -EACCES, flags = 0;
2646         struct smb2_write_req *req = NULL;
2647         struct smb2_sync_hdr *shdr;
2648         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2649         struct TCP_Server_Info *server = tcon->ses->server;
2650         struct kvec iov[2];
2651         struct smb_rqst rqst = { };
2652 
2653         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2654         if (rc) {
2655                 if (rc == -EAGAIN && wdata->credits) {
2656                         /* credits was reset by reconnect */
2657                         wdata->credits = 0;
2658                         /* reduce in_flight value since we won't send the req */
2659                         spin_lock(&server->req_lock);
2660                         server->in_flight--;
2661                         spin_unlock(&server->req_lock);
2662                 }
2663                 goto async_writev_out;
2664         }
2665 
2666         if (encryption_required(tcon))
2667                 flags |= CIFS_TRANSFORM_REQ;
2668 
2669         shdr = get_sync_hdr(req);
2670         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2671 
2672         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2673         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2674         req->WriteChannelInfoOffset = 0;
2675         req->WriteChannelInfoLength = 0;
2676         req->Channel = 0;
2677         req->Offset = cpu_to_le64(wdata->offset);
2678         /* 4 for rfc1002 length field */
2679         req->DataOffset = cpu_to_le16(
2680                                 offsetof(struct smb2_write_req, Buffer) - 4);
2681         req->RemainingBytes = 0;
2682 
2683         /* 4 for rfc1002 length field and 1 for Buffer */
2684         iov[0].iov_len = 4;
2685         iov[0].iov_base = req;
2686         iov[1].iov_len = get_rfc1002_length(req) - 1;
2687         iov[1].iov_base = (char *)req + 4;
2688 
2689         rqst.rq_iov = iov;
2690         rqst.rq_nvec = 2;
2691         rqst.rq_pages = wdata->pages;
2692         rqst.rq_npages = wdata->nr_pages;
2693         rqst.rq_pagesz = wdata->pagesz;
2694         rqst.rq_tailsz = wdata->tailsz;
2695 
2696         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2697                  wdata->offset, wdata->bytes);
2698 
2699         req->Length = cpu_to_le32(wdata->bytes);
2700 
2701         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2702 
2703         if (wdata->credits) {
2704                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2705                                                     SMB2_MAX_BUFFER_SIZE));
2706                 shdr->CreditRequest = shdr->CreditCharge;
2707                 spin_lock(&server->req_lock);
2708                 server->credits += wdata->credits -
2709                                                 le16_to_cpu(shdr->CreditCharge);
2710                 spin_unlock(&server->req_lock);
2711                 wake_up(&server->request_q);
2712                 flags |= CIFS_HAS_CREDITS;
2713         }
2714 
2715         kref_get(&wdata->refcount);
2716         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2717                              wdata, flags);
2718 
2719         if (rc) {
2720                 kref_put(&wdata->refcount, release);
2721                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2722         }
2723 
2724 async_writev_out:
2725         cifs_small_buf_release(req);
2726         return rc;
2727 }
2728 
2729 /*
2730  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2731  * The length field from io_parms must be at least 1 and indicates a number of
2732  * elements with data to write that begins with position 1 in iov array. All
2733  * data length is specified by count.
2734  */
2735 int
2736 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2737            unsigned int *nbytes, struct kvec *iov, int n_vec)
2738 {
2739         int rc = 0;
2740         struct smb2_write_req *req = NULL;
2741         struct smb2_write_rsp *rsp = NULL;
2742         int resp_buftype;
2743         struct kvec rsp_iov;
2744         int flags = 0;
2745 
2746         *nbytes = 0;
2747 
2748         if (n_vec < 1)
2749                 return rc;
2750 
2751         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2752         if (rc)
2753                 return rc;
2754 
2755         if (io_parms->tcon->ses->server == NULL)
2756                 return -ECONNABORTED;
2757 
2758         if (encryption_required(io_parms->tcon))
2759                 flags |= CIFS_TRANSFORM_REQ;
2760 
2761         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2762 
2763         req->PersistentFileId = io_parms->persistent_fid;
2764         req->VolatileFileId = io_parms->volatile_fid;
2765         req->WriteChannelInfoOffset = 0;
2766         req->WriteChannelInfoLength = 0;
2767         req->Channel = 0;
2768         req->Length = cpu_to_le32(io_parms->length);
2769         req->Offset = cpu_to_le64(io_parms->offset);
2770         /* 4 for rfc1002 length field */
2771         req->DataOffset = cpu_to_le16(
2772                                 offsetof(struct smb2_write_req, Buffer) - 4);
2773         req->RemainingBytes = 0;
2774 
2775         iov[0].iov_base = (char *)req;
2776         /* 4 for rfc1002 length field and 1 for Buffer */
2777         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2778 
2779         /* length of entire message including data to be written */
2780         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2781 
2782         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2783                           &resp_buftype, flags, &rsp_iov);
2784         cifs_small_buf_release(req);
2785         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2786 
2787         if (rc) {
2788                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2789                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2790         } else
2791                 *nbytes = le32_to_cpu(rsp->DataLength);
2792 
2793         free_rsp_buf(resp_buftype, rsp);
2794         return rc;
2795 }
2796 
2797 static unsigned int
2798 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2799 {
2800         int len;
2801         unsigned int entrycount = 0;
2802         unsigned int next_offset = 0;
2803         FILE_DIRECTORY_INFO *entryptr;
2804 
2805         if (bufstart == NULL)
2806                 return 0;
2807 
2808         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2809 
2810         while (1) {
2811                 entryptr = (FILE_DIRECTORY_INFO *)
2812                                         ((char *)entryptr + next_offset);
2813 
2814                 if ((char *)entryptr + size > end_of_buf) {
2815                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2816                         break;
2817                 }
2818 
2819                 len = le32_to_cpu(entryptr->FileNameLength);
2820                 if ((char *)entryptr + len + size > end_of_buf) {
2821                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2822                                  end_of_buf);
2823                         break;
2824                 }
2825 
2826                 *lastentry = (char *)entryptr;
2827                 entrycount++;
2828 
2829                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2830                 if (!next_offset)
2831                         break;
2832         }
2833 
2834         return entrycount;
2835 }
2836 
2837 /*
2838  * Readdir/FindFirst
2839  */
2840 int
2841 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2842                      u64 persistent_fid, u64 volatile_fid, int index,
2843                      struct cifs_search_info *srch_inf)
2844 {
2845         struct smb2_query_directory_req *req;
2846         struct smb2_query_directory_rsp *rsp = NULL;
2847         struct kvec iov[2];
2848         struct kvec rsp_iov;
2849         int rc = 0;
2850         int len;
2851         int resp_buftype = CIFS_NO_BUFFER;
2852         unsigned char *bufptr;
2853         struct TCP_Server_Info *server;
2854         struct cifs_ses *ses = tcon->ses;
2855         __le16 asteriks = cpu_to_le16('*');
2856         char *end_of_smb;
2857         unsigned int output_size = CIFSMaxBufSize;
2858         size_t info_buf_size;
2859         int flags = 0;
2860 
2861         if (ses && (ses->server))
2862                 server = ses->server;
2863         else
2864                 return -EIO;
2865 
2866         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2867         if (rc)
2868                 return rc;
2869 
2870         if (encryption_required(tcon))
2871                 flags |= CIFS_TRANSFORM_REQ;
2872 
2873         switch (srch_inf->info_level) {
2874         case SMB_FIND_FILE_DIRECTORY_INFO:
2875                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2876                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2877                 break;
2878         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2879                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2880                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2881                 break;
2882         default:
2883                 cifs_dbg(VFS, "info level %u isn't supported\n",
2884                          srch_inf->info_level);
2885                 rc = -EINVAL;
2886                 goto qdir_exit;
2887         }
2888 
2889         req->FileIndex = cpu_to_le32(index);
2890         req->PersistentFileId = persistent_fid;
2891         req->VolatileFileId = volatile_fid;
2892 
2893         len = 0x2;
2894         bufptr = req->Buffer;
2895         memcpy(bufptr, &asteriks, len);
2896 
2897         req->FileNameOffset =
2898                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2899         req->FileNameLength = cpu_to_le16(len);
2900         /*
2901          * BB could be 30 bytes or so longer if we used SMB2 specific
2902          * buffer lengths, but this is safe and close enough.
2903          */
2904         output_size = min_t(unsigned int, output_size, server->maxBuf);
2905         output_size = min_t(unsigned int, output_size, 2 << 15);
2906         req->OutputBufferLength = cpu_to_le32(output_size);
2907 
2908         iov[0].iov_base = (char *)req;
2909         /* 4 for RFC1001 length and 1 for Buffer */
2910         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2911 
2912         iov[1].iov_base = (char *)(req->Buffer);
2913         iov[1].iov_len = len;
2914 
2915         inc_rfc1001_len(req, len - 1 /* Buffer */);
2916 
2917         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2918         cifs_small_buf_release(req);
2919         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2920 
2921         if (rc) {
2922                 if (rc == -ENODATA &&
2923                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2924                         srch_inf->endOfSearch = true;
2925                         rc = 0;
2926                 }
2927                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2928                 goto qdir_exit;
2929         }
2930 
2931         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2932                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2933                           info_buf_size);
2934         if (rc)
2935                 goto qdir_exit;
2936 
2937         srch_inf->unicode = true;
2938 
2939         if (srch_inf->ntwrk_buf_start) {
2940                 if (srch_inf->smallBuf)
2941                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2942                 else
2943                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2944         }
2945         srch_inf->ntwrk_buf_start = (char *)rsp;
2946         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2947                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2948         /* 4 for rfc1002 length field */
2949         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2950         srch_inf->entries_in_buffer =
2951                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2952                                     &srch_inf->last_entry, info_buf_size);
2953         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2954         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2955                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2956                  srch_inf->srch_entries_start, srch_inf->last_entry);
2957         if (resp_buftype == CIFS_LARGE_BUFFER)
2958                 srch_inf->smallBuf = false;
2959         else if (resp_buftype == CIFS_SMALL_BUFFER)
2960                 srch_inf->smallBuf = true;
2961         else
2962                 cifs_dbg(VFS, "illegal search buffer type\n");
2963 
2964         return rc;
2965 
2966 qdir_exit:
2967         free_rsp_buf(resp_buftype, rsp);
2968         return rc;
2969 }
2970 
2971 static int
2972 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2973                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2974                unsigned int num, void **data, unsigned int *size)
2975 {
2976         struct smb2_set_info_req *req;
2977         struct smb2_set_info_rsp *rsp = NULL;
2978         struct kvec *iov;
2979         struct kvec rsp_iov;
2980         int rc = 0;
2981         int resp_buftype;
2982         unsigned int i;
2983         struct TCP_Server_Info *server;
2984         struct cifs_ses *ses = tcon->ses;
2985         int flags = 0;
2986 
2987         if (ses && (ses->server))
2988                 server = ses->server;
2989         else
2990                 return -EIO;
2991 
2992         if (!num)
2993                 return -EINVAL;
2994 
2995         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2996         if (!iov)
2997                 return -ENOMEM;
2998 
2999         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3000         if (rc) {
3001                 kfree(iov);
3002                 return rc;
3003         }
3004 
3005         if (encryption_required(tcon))
3006                 flags |= CIFS_TRANSFORM_REQ;
3007 
3008         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3009 
3010         req->InfoType = SMB2_O_INFO_FILE;
3011         req->FileInfoClass = info_class;
3012         req->PersistentFileId = persistent_fid;
3013         req->VolatileFileId = volatile_fid;
3014 
3015         /* 4 for RFC1001 length and 1 for Buffer */
3016         req->BufferOffset =
3017                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3018         req->BufferLength = cpu_to_le32(*size);
3019 
3020         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3021 
3022         memcpy(req->Buffer, *data, *size);
3023 
3024         iov[0].iov_base = (char *)req;
3025         /* 4 for RFC1001 length */
3026         iov[0].iov_len = get_rfc1002_length(req) + 4;
3027 
3028         for (i = 1; i < num; i++) {
3029                 inc_rfc1001_len(req, size[i]);
3030                 le32_add_cpu(&req->BufferLength, size[i]);
3031                 iov[i].iov_base = (char *)data[i];
3032                 iov[i].iov_len = size[i];
3033         }
3034 
3035         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3036         cifs_small_buf_release(req);
3037         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3038 
3039         if (rc != 0)
3040                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3041 
3042         free_rsp_buf(resp_buftype, rsp);
3043         kfree(iov);
3044         return rc;
3045 }
3046 
3047 int
3048 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3049             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3050 {
3051         struct smb2_file_rename_info info;
3052         void **data;
3053         unsigned int size[2];
3054         int rc;
3055         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3056 
3057         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3058         if (!data)
3059                 return -ENOMEM;
3060 
3061         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3062                               /* 0 = fail if target already exists */
3063         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3064         info.FileNameLength = cpu_to_le32(len);
3065 
3066         data[0] = &info;
3067         size[0] = sizeof(struct smb2_file_rename_info);
3068 
3069         data[1] = target_file;
3070         size[1] = len + 2 /* null */;
3071 
3072         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3073                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
3074                            size);
3075         kfree(data);
3076         return rc;
3077 }
3078 
3079 int
3080 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3081                   u64 persistent_fid, u64 volatile_fid)
3082 {
3083         __u8 delete_pending = 1;
3084         void *data;
3085         unsigned int size;
3086 
3087         data = &delete_pending;
3088         size = 1; /* sizeof __u8 */
3089 
3090         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3091                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
3092                         &size);
3093 }
3094 
3095 int
3096 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3097                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3098 {
3099         struct smb2_file_link_info info;
3100         void **data;
3101         unsigned int size[2];
3102         int rc;
3103         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3104 
3105         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3106         if (!data)
3107                 return -ENOMEM;
3108 
3109         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3110                               /* 0 = fail if link already exists */
3111         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3112         info.FileNameLength = cpu_to_le32(len);
3113 
3114         data[0] = &info;
3115         size[0] = sizeof(struct smb2_file_link_info);
3116 
3117         data[1] = target_file;
3118         size[1] = len + 2 /* null */;
3119 
3120         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3121                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
3122         kfree(data);
3123         return rc;
3124 }
3125 
3126 int
3127 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3128              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3129 {
3130         struct smb2_file_eof_info info;
3131         void *data;
3132         unsigned int size;
3133 
3134         info.EndOfFile = *eof;
3135 
3136         data = &info;
3137         size = sizeof(struct smb2_file_eof_info);
3138 
3139         if (is_falloc)
3140                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3141                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
3142         else
3143                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3144                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
3145 }
3146 
3147 int
3148 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3149               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3150 {
3151         unsigned int size;
3152         size = sizeof(FILE_BASIC_INFO);
3153         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3154                              current->tgid, FILE_BASIC_INFORMATION, 1,
3155                              (void **)&buf, &size);
3156 }
3157 
3158 int
3159 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3160                   const u64 persistent_fid, const u64 volatile_fid,
3161                   __u8 oplock_level)
3162 {
3163         int rc;
3164         struct smb2_oplock_break *req = NULL;
3165         int flags = CIFS_OBREAK_OP;
3166 
3167         cifs_dbg(FYI, "SMB2_oplock_break\n");
3168         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3169         if (rc)
3170                 return rc;
3171 
3172         if (encryption_required(tcon))
3173                 flags |= CIFS_TRANSFORM_REQ;
3174 
3175         req->VolatileFid = volatile_fid;
3176         req->PersistentFid = persistent_fid;
3177         req->OplockLevel = oplock_level;
3178         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3179 
3180         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3181         cifs_small_buf_release(req);
3182 
3183         if (rc) {
3184                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3185                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3186         }
3187 
3188         return rc;
3189 }
3190 
3191 static void
3192 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3193                         struct kstatfs *kst)
3194 {
3195         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3196                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3197         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3198         kst->f_bfree  = kst->f_bavail =
3199                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3200         return;
3201 }
3202 
3203 static int
3204 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3205                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3206 {
3207         int rc;
3208         struct smb2_query_info_req *req;
3209 
3210         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3211 
3212         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3213                 return -EIO;
3214 
3215         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3216         if (rc)
3217                 return rc;
3218 
3219         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3220         req->FileInfoClass = level;
3221         req->PersistentFileId = persistent_fid;
3222         req->VolatileFileId = volatile_fid;
3223         /* 4 for rfc1002 length field and 1 for pad */
3224         req->InputBufferOffset =
3225                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3226         req->OutputBufferLength = cpu_to_le32(
3227                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3228 
3229         iov->iov_base = (char *)req;
3230         /* 4 for rfc1002 length field */
3231         iov->iov_len = get_rfc1002_length(req) + 4;
3232         return 0;
3233 }
3234 
3235 int
3236 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3237               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3238 {
3239         struct smb2_query_info_rsp *rsp = NULL;
3240         struct kvec iov;
3241         struct kvec rsp_iov;
3242         int rc = 0;
3243         int resp_buftype;
3244         struct cifs_ses *ses = tcon->ses;
3245         struct smb2_fs_full_size_info *info = NULL;
3246         int flags = 0;
3247 
3248         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3249                                 sizeof(struct smb2_fs_full_size_info),
3250                                 persistent_fid, volatile_fid);
3251         if (rc)
3252                 return rc;
3253 
3254         if (encryption_required(tcon))
3255                 flags |= CIFS_TRANSFORM_REQ;
3256 
3257         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3258         cifs_small_buf_release(iov.iov_base);
3259         if (rc) {
3260                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3261                 goto qfsinf_exit;
3262         }
3263         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3264 
3265         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3266                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3267         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3268                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3269                           sizeof(struct smb2_fs_full_size_info));
3270         if (!rc)
3271                 copy_fs_info_to_kstatfs(info, fsdata);
3272 
3273 qfsinf_exit:
3274         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3275         return rc;
3276 }
3277 
3278 int
3279 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3280               u64 persistent_fid, u64 volatile_fid, int level)
3281 {
3282         struct smb2_query_info_rsp *rsp = NULL;
3283         struct kvec iov;
3284         struct kvec rsp_iov;
3285         int rc = 0;
3286         int resp_buftype, max_len, min_len;
3287         struct cifs_ses *ses = tcon->ses;
3288         unsigned int rsp_len, offset;
3289         int flags = 0;
3290 
3291         if (level == FS_DEVICE_INFORMATION) {
3292                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3293                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3294         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3295                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3296                 min_len = MIN_FS_ATTR_INFO_SIZE;
3297         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3298                 max_len = sizeof(struct smb3_fs_ss_info);
3299                 min_len = sizeof(struct smb3_fs_ss_info);
3300         } else {
3301                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3302                 return -EINVAL;
3303         }
3304 
3305         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3306                                 persistent_fid, volatile_fid);
3307         if (rc)
3308                 return rc;
3309 
3310         if (encryption_required(tcon))
3311                 flags |= CIFS_TRANSFORM_REQ;
3312 
3313         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3314         cifs_small_buf_release(iov.iov_base);
3315         if (rc) {
3316                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3317                 goto qfsattr_exit;
3318         }
3319         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3320 
3321         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3322         offset = le16_to_cpu(rsp->OutputBufferOffset);
3323         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3324         if (rc)
3325                 goto qfsattr_exit;
3326 
3327         if (level == FS_ATTRIBUTE_INFORMATION)
3328                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3329                         + (char *)&rsp->hdr, min_t(unsigned int,
3330                         rsp_len, max_len));
3331         else if (level == FS_DEVICE_INFORMATION)
3332                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3333                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3334         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3335                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3336                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3337                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3338                 tcon->perf_sector_size =
3339                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3340         }
3341 
3342 qfsattr_exit:
3343         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3344         return rc;
3345 }
3346 
3347 int
3348 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3349            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3350            const __u32 num_lock, struct smb2_lock_element *buf)
3351 {
3352         int rc = 0;
3353         struct smb2_lock_req *req = NULL;
3354         struct kvec iov[2];
3355         struct kvec rsp_iov;
3356         int resp_buf_type;
3357         unsigned int count;
3358         int flags = CIFS_NO_RESP;
3359 
3360         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3361 
3362         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3363         if (rc)
3364                 return rc;
3365 
3366         if (encryption_required(tcon))
3367                 flags |= CIFS_TRANSFORM_REQ;
3368 
3369         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3370         req->LockCount = cpu_to_le16(num_lock);
3371 
3372         req->PersistentFileId = persist_fid;
3373         req->VolatileFileId = volatile_fid;
3374 
3375         count = num_lock * sizeof(struct smb2_lock_element);
3376         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3377 
3378         iov[0].iov_base = (char *)req;
3379         /* 4 for rfc1002 length field and count for all locks */
3380         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3381         iov[1].iov_base = (char *)buf;
3382         iov[1].iov_len = count;
3383 
3384         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3385         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3386                           &rsp_iov);
3387         cifs_small_buf_release(req);
3388         if (rc) {
3389                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3390                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3391         }
3392 
3393         return rc;
3394 }
3395 
3396 int
3397 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3398           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3399           const __u64 length, const __u64 offset, const __u32 lock_flags,
3400           const bool wait)
3401 {
3402         struct smb2_lock_element lock;
3403 
3404         lock.Offset = cpu_to_le64(offset);
3405         lock.Length = cpu_to_le64(length);
3406         lock.Flags = cpu_to_le32(lock_flags);
3407         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3408                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3409 
3410         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3411 }
3412 
3413 int
3414 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3415                  __u8 *lease_key, const __le32 lease_state)
3416 {
3417         int rc;
3418         struct smb2_lease_ack *req = NULL;
3419         int flags = CIFS_OBREAK_OP;
3420 
3421         cifs_dbg(FYI, "SMB2_lease_break\n");
3422         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3423         if (rc)
3424                 return rc;
3425 
3426         if (encryption_required(tcon))
3427                 flags |= CIFS_TRANSFORM_REQ;
3428 
3429         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3430         req->StructureSize = cpu_to_le16(36);
3431         inc_rfc1001_len(req, 12);
3432 
3433         memcpy(req->LeaseKey, lease_key, 16);
3434         req->LeaseState = lease_state;
3435 
3436         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3437         cifs_small_buf_release(req);
3438 
3439         if (rc) {
3440                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3441                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3442         }
3443 
3444         return rc;
3445 }
3446 

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