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

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
  5  *                 Etersoft, 2012
  6  *   Author(s): Steve French (sfrench@us.ibm.com)
  7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
  8  *
  9  *   Contains the routines for constructing the SMB2 PDUs themselves
 10  *
 11  *   This library is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU Lesser General Public License as published
 13  *   by the Free Software Foundation; either version 2.1 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This library is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 19  *   the GNU Lesser General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU Lesser General Public License
 22  *   along with this library; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  */
 25 
 26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 27  /* Note that there are handle based routines which must be                   */
 28  /* treated slightly differently for reconnection purposes since we never     */
 29  /* want to reuse a stale file handle and only the caller knows the file info */
 30 
 31 #include <linux/fs.h>
 32 #include <linux/kernel.h>
 33 #include <linux/vfs.h>
 34 #include <linux/task_io_accounting_ops.h>
 35 #include <linux/uaccess.h>
 36 #include <linux/uuid.h>
 37 #include <linux/pagemap.h>
 38 #include <linux/xattr.h>
 39 #include "smb2pdu.h"
 40 #include "cifsglob.h"
 41 #include "cifsacl.h"
 42 #include "cifsproto.h"
 43 #include "smb2proto.h"
 44 #include "cifs_unicode.h"
 45 #include "cifs_debug.h"
 46 #include "ntlmssp.h"
 47 #include "smb2status.h"
 48 #include "smb2glob.h"
 49 #include "cifspdu.h"
 50 #include "cifs_spnego.h"
 51 #include "smbdirect.h"
 52 #include "trace.h"
 53 
 54 /*
 55  *  The following table defines the expected "StructureSize" of SMB2 requests
 56  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 57  *
 58  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 59  *  indexed by command in host byte order.
 60  */
 61 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
 62         /* SMB2_NEGOTIATE */ 36,
 63         /* SMB2_SESSION_SETUP */ 25,
 64         /* SMB2_LOGOFF */ 4,
 65         /* SMB2_TREE_CONNECT */ 9,
 66         /* SMB2_TREE_DISCONNECT */ 4,
 67         /* SMB2_CREATE */ 57,
 68         /* SMB2_CLOSE */ 24,
 69         /* SMB2_FLUSH */ 24,
 70         /* SMB2_READ */ 49,
 71         /* SMB2_WRITE */ 49,
 72         /* SMB2_LOCK */ 48,
 73         /* SMB2_IOCTL */ 57,
 74         /* SMB2_CANCEL */ 4,
 75         /* SMB2_ECHO */ 4,
 76         /* SMB2_QUERY_DIRECTORY */ 33,
 77         /* SMB2_CHANGE_NOTIFY */ 32,
 78         /* SMB2_QUERY_INFO */ 41,
 79         /* SMB2_SET_INFO */ 33,
 80         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
 81 };
 82 
 83 int smb3_encryption_required(const struct cifs_tcon *tcon)
 84 {
 85         if (!tcon)
 86                 return 0;
 87         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
 88             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
 89                 return 1;
 90         if (tcon->seal &&
 91             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 92                 return 1;
 93         return 0;
 94 }
 95 
 96 static void
 97 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 98                   const struct cifs_tcon *tcon)
 99 {
100         shdr->ProtocolId = SMB2_PROTO_NUMBER;
101         shdr->StructureSize = cpu_to_le16(64);
102         shdr->Command = smb2_cmd;
103         if (tcon && tcon->ses && tcon->ses->server) {
104                 struct TCP_Server_Info *server = tcon->ses->server;
105 
106                 spin_lock(&server->req_lock);
107                 /* Request up to 2 credits but don't go over the limit. */
108                 if (server->credits >= server->max_credits)
109                         shdr->CreditRequest = cpu_to_le16(0);
110                 else
111                         shdr->CreditRequest = cpu_to_le16(
112                                 min_t(int, server->max_credits -
113                                                 server->credits, 2));
114                 spin_unlock(&server->req_lock);
115         } else {
116                 shdr->CreditRequest = cpu_to_le16(2);
117         }
118         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
119 
120         if (!tcon)
121                 goto out;
122 
123         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
124         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
125         if ((tcon->ses) && (tcon->ses->server) &&
126             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
127                 shdr->CreditCharge = cpu_to_le16(1);
128         /* else CreditCharge MBZ */
129 
130         shdr->TreeId = tcon->tid;
131         /* Uid is not converted */
132         if (tcon->ses)
133                 shdr->SessionId = tcon->ses->Suid;
134 
135         /*
136          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
137          * to pass the path on the Open SMB prefixed by \\server\share.
138          * Not sure when we would need to do the augmented path (if ever) and
139          * setting this flag breaks the SMB2 open operation since it is
140          * illegal to send an empty path name (without \\server\share prefix)
141          * when the DFS flag is set in the SMB open header. We could
142          * consider setting the flag on all operations other than open
143          * but it is safer to net set it for now.
144          */
145 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
146                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
147 
148         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
149             !smb3_encryption_required(tcon))
150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
151 out:
152         return;
153 }
154 
155 static int
156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
157 {
158         int rc;
159         struct nls_table *nls_codepage;
160         struct cifs_ses *ses;
161         struct TCP_Server_Info *server;
162 
163         /*
164          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
165          * check for tcp and smb session status done differently
166          * for those three - in the calling routine.
167          */
168         if (tcon == NULL)
169                 return 0;
170 
171         if (smb2_command == SMB2_TREE_CONNECT)
172                 return 0;
173 
174         if (tcon->tidStatus == CifsExiting) {
175                 /*
176                  * only tree disconnect, open, and write,
177                  * (and ulogoff which does not have tcon)
178                  * are allowed as we start force umount.
179                  */
180                 if ((smb2_command != SMB2_WRITE) &&
181                    (smb2_command != SMB2_CREATE) &&
182                    (smb2_command != SMB2_TREE_DISCONNECT)) {
183                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
184                                  smb2_command);
185                         return -ENODEV;
186                 }
187         }
188         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
189             (!tcon->ses->server))
190                 return -EIO;
191 
192         ses = tcon->ses;
193         server = ses->server;
194 
195         /*
196          * Give demultiplex thread up to 10 seconds to reconnect, should be
197          * greater than cifs socket timeout which is 7 seconds
198          */
199         while (server->tcpStatus == CifsNeedReconnect) {
200                 /*
201                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
202                  * here since they are implicitly done when session drops.
203                  */
204                 switch (smb2_command) {
205                 /*
206                  * BB Should we keep oplock break and add flush to exceptions?
207                  */
208                 case SMB2_TREE_DISCONNECT:
209                 case SMB2_CANCEL:
210                 case SMB2_CLOSE:
211                 case SMB2_OPLOCK_BREAK:
212                         return -EAGAIN;
213                 }
214 
215                 rc = wait_event_interruptible_timeout(server->response_q,
216                                                       (server->tcpStatus != CifsNeedReconnect),
217                                                       10 * HZ);
218                 if (rc < 0) {
219                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
220                                  " signal by the process\n", __func__);
221                         return -ERESTARTSYS;
222                 }
223 
224                 /* are we still trying to reconnect? */
225                 if (server->tcpStatus != CifsNeedReconnect)
226                         break;
227 
228                 /*
229                  * on "soft" mounts we wait once. Hard mounts keep
230                  * retrying until process is killed or server comes
231                  * back on-line
232                  */
233                 if (!tcon->retry) {
234                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
235                         return -EHOSTDOWN;
236                 }
237         }
238 
239         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
240                 return 0;
241 
242         nls_codepage = load_nls_default();
243 
244         /*
245          * need to prevent multiple threads trying to simultaneously reconnect
246          * the same SMB session
247          */
248         mutex_lock(&tcon->ses->session_mutex);
249 
250         /*
251          * Recheck after acquire mutex. If another thread is negotiating
252          * and the server never sends an answer the socket will be closed
253          * and tcpStatus set to reconnect.
254          */
255         if (server->tcpStatus == CifsNeedReconnect) {
256                 rc = -EHOSTDOWN;
257                 mutex_unlock(&tcon->ses->session_mutex);
258                 goto out;
259         }
260 
261         rc = cifs_negotiate_protocol(0, tcon->ses);
262         if (!rc && tcon->ses->need_reconnect)
263                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
264 
265         if (rc || !tcon->need_reconnect) {
266                 mutex_unlock(&tcon->ses->session_mutex);
267                 goto out;
268         }
269 
270         cifs_mark_open_files_invalid(tcon);
271         if (tcon->use_persistent)
272                 tcon->need_reopen_files = true;
273 
274         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
275         mutex_unlock(&tcon->ses->session_mutex);
276 
277         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
278         if (rc) {
279                 /* If sess reconnected but tcon didn't, something strange ... */
280                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
281                 goto out;
282         }
283 
284         if (smb2_command != SMB2_INTERNAL_CMD)
285                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
286 
287         atomic_inc(&tconInfoReconnectCount);
288 out:
289         /*
290          * Check if handle based operation so we know whether we can continue
291          * or not without returning to caller to reset file handle.
292          */
293         /*
294          * BB Is flush done by server on drop of tcp session? Should we special
295          * case it and skip above?
296          */
297         switch (smb2_command) {
298         case SMB2_FLUSH:
299         case SMB2_READ:
300         case SMB2_WRITE:
301         case SMB2_LOCK:
302         case SMB2_IOCTL:
303         case SMB2_QUERY_DIRECTORY:
304         case SMB2_CHANGE_NOTIFY:
305         case SMB2_QUERY_INFO:
306         case SMB2_SET_INFO:
307                 rc = -EAGAIN;
308         }
309         unload_nls(nls_codepage);
310         return rc;
311 }
312 
313 static void
314 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
315                unsigned int *total_len)
316 {
317         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
318         /* lookup word count ie StructureSize from table */
319         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
320 
321         /*
322          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
323          * largest operations (Create)
324          */
325         memset(buf, 0, 256);
326 
327         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
328         spdu->StructureSize2 = cpu_to_le16(parmsize);
329 
330         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
331 }
332 
333 /*
334  * Allocate and return pointer to an SMB request hdr, and set basic
335  * SMB information in the SMB header. If the return code is zero, this
336  * function must have filled in request_buf pointer.
337  */
338 static int
339 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
340                     void **request_buf, unsigned int *total_len)
341 {
342         int rc;
343 
344         rc = smb2_reconnect(smb2_command, tcon);
345         if (rc)
346                 return rc;
347 
348         /* BB eventually switch this to SMB2 specific small buf size */
349         if (smb2_command == SMB2_SET_INFO)
350                 *request_buf = cifs_buf_get();
351         else
352                 *request_buf = cifs_small_buf_get();
353         if (*request_buf == NULL) {
354                 /* BB should we add a retry in here if not a writepage? */
355                 return -ENOMEM;
356         }
357 
358         fill_small_buf(smb2_command, tcon,
359                        (struct smb2_sync_hdr *)(*request_buf),
360                        total_len);
361 
362         if (tcon != NULL) {
363                 uint16_t com_code = le16_to_cpu(smb2_command);
364                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
365                 cifs_stats_inc(&tcon->num_smbs_sent);
366         }
367 
368         return rc;
369 }
370 
371 
372 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
373 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
374 
375 
376 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
377 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
378 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
379 
380 static void
381 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
382 {
383         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
384         pneg_ctxt->DataLength = cpu_to_le16(38);
385         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
386         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
387         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
388         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
389 }
390 
391 static void
392 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
393 {
394         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
395         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
396         pneg_ctxt->CipherCount = cpu_to_le16(1);
397 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
398         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
399 }
400 
401 static void
402 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
403 {
404         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
405         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
406 }
407 
408 static void
409 assemble_neg_contexts(struct smb2_negotiate_req *req,
410                       unsigned int *total_len)
411 {
412         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
413         unsigned int ctxt_len;
414 
415         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
416         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
417         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
418         *total_len += ctxt_len;
419         pneg_ctxt += ctxt_len;
420 
421         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
422         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
423         *total_len += ctxt_len;
424         pneg_ctxt += ctxt_len;
425 
426         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
427         *total_len += sizeof(struct smb2_posix_neg_context);
428 
429         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
430         req->NegotiateContextCount = cpu_to_le16(3);
431 }
432 
433 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
434 {
435         unsigned int len = le16_to_cpu(ctxt->DataLength);
436 
437         /* If invalid preauth context warn but use what we requested, SHA-512 */
438         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
439                 printk_once(KERN_WARNING "server sent bad preauth context\n");
440                 return;
441         }
442         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
443                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
444         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
445                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
446 }
447 
448 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
449                               struct smb2_encryption_neg_context *ctxt)
450 {
451         unsigned int len = le16_to_cpu(ctxt->DataLength);
452 
453         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
454         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
455                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
456                 return -EINVAL;
457         }
458 
459         if (le16_to_cpu(ctxt->CipherCount) != 1) {
460                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
461                 return -EINVAL;
462         }
463         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
464         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
465             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
466                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
467                 return -EINVAL;
468         }
469         server->cipher_type = ctxt->Ciphers[0];
470         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
471         return 0;
472 }
473 
474 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
475                                      struct TCP_Server_Info *server,
476                                      unsigned int len_of_smb)
477 {
478         struct smb2_neg_context *pctx;
479         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
480         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
481         unsigned int len_of_ctxts, i;
482         int rc = 0;
483 
484         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
485         if (len_of_smb <= offset) {
486                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
487                 return -EINVAL;
488         }
489 
490         len_of_ctxts = len_of_smb - offset;
491 
492         for (i = 0; i < ctxt_cnt; i++) {
493                 int clen;
494                 /* check that offset is not beyond end of SMB */
495                 if (len_of_ctxts == 0)
496                         break;
497 
498                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
499                         break;
500 
501                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
502                 clen = le16_to_cpu(pctx->DataLength);
503                 if (clen > len_of_ctxts)
504                         break;
505 
506                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
507                         decode_preauth_context(
508                                 (struct smb2_preauth_neg_context *)pctx);
509                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
510                         rc = decode_encrypt_ctx(server,
511                                 (struct smb2_encryption_neg_context *)pctx);
512                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
513                         server->posix_ext_supported = true;
514                 else
515                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
516                                 le16_to_cpu(pctx->ContextType));
517 
518                 if (rc)
519                         break;
520                 /* offsets must be 8 byte aligned */
521                 clen = (clen + 7) & ~0x7;
522                 offset += clen + sizeof(struct smb2_neg_context);
523                 len_of_ctxts -= clen;
524         }
525         return rc;
526 }
527 
528 static struct create_posix *
529 create_posix_buf(umode_t mode)
530 {
531         struct create_posix *buf;
532 
533         buf = kzalloc(sizeof(struct create_posix),
534                         GFP_KERNEL);
535         if (!buf)
536                 return NULL;
537 
538         buf->ccontext.DataOffset =
539                 cpu_to_le16(offsetof(struct create_posix, Mode));
540         buf->ccontext.DataLength = cpu_to_le32(4);
541         buf->ccontext.NameOffset =
542                 cpu_to_le16(offsetof(struct create_posix, Name));
543         buf->ccontext.NameLength = cpu_to_le16(16);
544 
545         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
546         buf->Name[0] = 0x93;
547         buf->Name[1] = 0xAD;
548         buf->Name[2] = 0x25;
549         buf->Name[3] = 0x50;
550         buf->Name[4] = 0x9C;
551         buf->Name[5] = 0xB4;
552         buf->Name[6] = 0x11;
553         buf->Name[7] = 0xE7;
554         buf->Name[8] = 0xB4;
555         buf->Name[9] = 0x23;
556         buf->Name[10] = 0x83;
557         buf->Name[11] = 0xDE;
558         buf->Name[12] = 0x96;
559         buf->Name[13] = 0x8B;
560         buf->Name[14] = 0xCD;
561         buf->Name[15] = 0x7C;
562         buf->Mode = cpu_to_le32(mode);
563         cifs_dbg(FYI, "mode on posix create 0%o", mode);
564         return buf;
565 }
566 
567 static int
568 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
569 {
570         struct smb2_create_req *req = iov[0].iov_base;
571         unsigned int num = *num_iovec;
572 
573         iov[num].iov_base = create_posix_buf(mode);
574         if (iov[num].iov_base == NULL)
575                 return -ENOMEM;
576         iov[num].iov_len = sizeof(struct create_posix);
577         if (!req->CreateContextsOffset)
578                 req->CreateContextsOffset = cpu_to_le32(
579                                 sizeof(struct smb2_create_req) +
580                                 iov[num - 1].iov_len);
581         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
582         *num_iovec = num + 1;
583         return 0;
584 }
585 
586 
587 /*
588  *
589  *      SMB2 Worker functions follow:
590  *
591  *      The general structure of the worker functions is:
592  *      1) Call smb2_init (assembles SMB2 header)
593  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
594  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
595  *      4) Decode SMB2 command specific fields in the fixed length area
596  *      5) Decode variable length data area (if any for this SMB2 command type)
597  *      6) Call free smb buffer
598  *      7) return
599  *
600  */
601 
602 int
603 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
604 {
605         struct smb_rqst rqst;
606         struct smb2_negotiate_req *req;
607         struct smb2_negotiate_rsp *rsp;
608         struct kvec iov[1];
609         struct kvec rsp_iov;
610         int rc = 0;
611         int resp_buftype;
612         struct TCP_Server_Info *server = ses->server;
613         int blob_offset, blob_length;
614         char *security_blob;
615         int flags = CIFS_NEG_OP;
616         unsigned int total_len;
617 
618         cifs_dbg(FYI, "Negotiate protocol\n");
619 
620         if (!server) {
621                 WARN(1, "%s: server is NULL!\n", __func__);
622                 return -EIO;
623         }
624 
625         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
626         if (rc)
627                 return rc;
628 
629         req->sync_hdr.SessionId = 0;
630 
631         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
632         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
633 
634         if (strcmp(ses->server->vals->version_string,
635                    SMB3ANY_VERSION_STRING) == 0) {
636                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
637                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
638                 req->DialectCount = cpu_to_le16(2);
639                 total_len += 4;
640         } else if (strcmp(ses->server->vals->version_string,
641                    SMBDEFAULT_VERSION_STRING) == 0) {
642                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
643                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
644                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
645                 req->DialectCount = cpu_to_le16(3);
646                 total_len += 6;
647         } else {
648                 /* otherwise send specific dialect */
649                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
650                 req->DialectCount = cpu_to_le16(1);
651                 total_len += 2;
652         }
653 
654         /* only one of SMB2 signing flags may be set in SMB2 request */
655         if (ses->sign)
656                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
657         else if (global_secflags & CIFSSEC_MAY_SIGN)
658                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
659         else
660                 req->SecurityMode = 0;
661 
662         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
663 
664         /* ClientGUID must be zero for SMB2.02 dialect */
665         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
666                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
667         else {
668                 memcpy(req->ClientGUID, server->client_guid,
669                         SMB2_CLIENT_GUID_SIZE);
670                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
671                         assemble_neg_contexts(req, &total_len);
672         }
673         iov[0].iov_base = (char *)req;
674         iov[0].iov_len = total_len;
675 
676         memset(&rqst, 0, sizeof(struct smb_rqst));
677         rqst.rq_iov = iov;
678         rqst.rq_nvec = 1;
679 
680         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
681         cifs_small_buf_release(req);
682         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
683         /*
684          * No tcon so can't do
685          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
686          */
687         if (rc == -EOPNOTSUPP) {
688                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
689                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
690                         " older servers\n");
691                 goto neg_exit;
692         } else if (rc != 0)
693                 goto neg_exit;
694 
695         if (strcmp(ses->server->vals->version_string,
696                    SMB3ANY_VERSION_STRING) == 0) {
697                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
698                         cifs_dbg(VFS,
699                                 "SMB2 dialect returned but not requested\n");
700                         return -EIO;
701                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
702                         cifs_dbg(VFS,
703                                 "SMB2.1 dialect returned but not requested\n");
704                         return -EIO;
705                 }
706         } else if (strcmp(ses->server->vals->version_string,
707                    SMBDEFAULT_VERSION_STRING) == 0) {
708                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
709                         cifs_dbg(VFS,
710                                 "SMB2 dialect returned but not requested\n");
711                         return -EIO;
712                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
713                         /* ops set to 3.0 by default for default so update */
714                         ses->server->ops = &smb21_operations;
715                 }
716         } else if (le16_to_cpu(rsp->DialectRevision) !=
717                                 ses->server->vals->protocol_id) {
718                 /* if requested single dialect ensure returned dialect matched */
719                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
720                         le16_to_cpu(rsp->DialectRevision));
721                 return -EIO;
722         }
723 
724         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
725 
726         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
727                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
728         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
729                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
730         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
731                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
732         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
733                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
734         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
735                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
736         else {
737                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
738                          le16_to_cpu(rsp->DialectRevision));
739                 rc = -EIO;
740                 goto neg_exit;
741         }
742         server->dialect = le16_to_cpu(rsp->DialectRevision);
743 
744         /*
745          * Keep a copy of the hash after negprot. This hash will be
746          * the starting hash value for all sessions made from this
747          * server.
748          */
749         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
750                SMB2_PREAUTH_HASH_SIZE);
751 
752         /* SMB2 only has an extended negflavor */
753         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
754         /* set it to the maximum buffer size value we can send with 1 credit */
755         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
756                                SMB2_MAX_BUFFER_SIZE);
757         server->max_read = le32_to_cpu(rsp->MaxReadSize);
758         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
759         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
760         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
761                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
762                                 server->sec_mode);
763         server->capabilities = le32_to_cpu(rsp->Capabilities);
764         /* Internal types */
765         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
766 
767         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
768                                                (struct smb2_sync_hdr *)rsp);
769         /*
770          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
771          * for us will be
772          *      ses->sectype = RawNTLMSSP;
773          * but for time being this is our only auth choice so doesn't matter.
774          * We just found a server which sets blob length to zero expecting raw.
775          */
776         if (blob_length == 0) {
777                 cifs_dbg(FYI, "missing security blob on negprot\n");
778                 server->sec_ntlmssp = true;
779         }
780 
781         rc = cifs_enable_signing(server, ses->sign);
782         if (rc)
783                 goto neg_exit;
784         if (blob_length) {
785                 rc = decode_negTokenInit(security_blob, blob_length, server);
786                 if (rc == 1)
787                         rc = 0;
788                 else if (rc == 0)
789                         rc = -EIO;
790         }
791 
792         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
793                 if (rsp->NegotiateContextCount)
794                         rc = smb311_decode_neg_context(rsp, server,
795                                                        rsp_iov.iov_len);
796                 else
797                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
798         }
799 neg_exit:
800         free_rsp_buf(resp_buftype, rsp);
801         return rc;
802 }
803 
804 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
805 {
806         int rc;
807         struct validate_negotiate_info_req *pneg_inbuf;
808         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
809         u32 rsplen;
810         u32 inbuflen; /* max of 4 dialects */
811 
812         cifs_dbg(FYI, "validate negotiate\n");
813 
814         /* In SMB3.11 preauth integrity supersedes validate negotiate */
815         if (tcon->ses->server->dialect == SMB311_PROT_ID)
816                 return 0;
817 
818         /*
819          * validation ioctl must be signed, so no point sending this if we
820          * can not sign it (ie are not known user).  Even if signing is not
821          * required (enabled but not negotiated), in those cases we selectively
822          * sign just this, the first and only signed request on a connection.
823          * Having validation of negotiate info  helps reduce attack vectors.
824          */
825         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
826                 return 0; /* validation requires signing */
827 
828         if (tcon->ses->user_name == NULL) {
829                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
830                 return 0; /* validation requires signing */
831         }
832 
833         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
834                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
835 
836         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
837         if (!pneg_inbuf)
838                 return -ENOMEM;
839 
840         pneg_inbuf->Capabilities =
841                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
842         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
843                                         SMB2_CLIENT_GUID_SIZE);
844 
845         if (tcon->ses->sign)
846                 pneg_inbuf->SecurityMode =
847                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
848         else if (global_secflags & CIFSSEC_MAY_SIGN)
849                 pneg_inbuf->SecurityMode =
850                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
851         else
852                 pneg_inbuf->SecurityMode = 0;
853 
854 
855         if (strcmp(tcon->ses->server->vals->version_string,
856                 SMB3ANY_VERSION_STRING) == 0) {
857                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
858                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
859                 pneg_inbuf->DialectCount = cpu_to_le16(2);
860                 /* structure is big enough for 3 dialects, sending only 2 */
861                 inbuflen = sizeof(*pneg_inbuf) -
862                                 sizeof(pneg_inbuf->Dialects[0]);
863         } else if (strcmp(tcon->ses->server->vals->version_string,
864                 SMBDEFAULT_VERSION_STRING) == 0) {
865                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
866                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
867                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
868                 pneg_inbuf->DialectCount = cpu_to_le16(3);
869                 /* structure is big enough for 3 dialects */
870                 inbuflen = sizeof(*pneg_inbuf);
871         } else {
872                 /* otherwise specific dialect was requested */
873                 pneg_inbuf->Dialects[0] =
874                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
875                 pneg_inbuf->DialectCount = cpu_to_le16(1);
876                 /* structure is big enough for 3 dialects, sending only 1 */
877                 inbuflen = sizeof(*pneg_inbuf) -
878                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
879         }
880 
881         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
882                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
883                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
884 
885         if (rc != 0) {
886                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
887                 rc = -EIO;
888                 goto out_free_inbuf;
889         }
890 
891         rc = -EIO;
892         if (rsplen != sizeof(*pneg_rsp)) {
893                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
894                          rsplen);
895 
896                 /* relax check since Mac returns max bufsize allowed on ioctl */
897                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
898                         goto out_free_rsp;
899         }
900 
901         /* check validate negotiate info response matches what we got earlier */
902         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
903                 goto vneg_out;
904 
905         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
906                 goto vneg_out;
907 
908         /* do not validate server guid because not saved at negprot time yet */
909 
910         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
911               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
912                 goto vneg_out;
913 
914         /* validate negotiate successful */
915         rc = 0;
916         cifs_dbg(FYI, "validate negotiate info successful\n");
917         goto out_free_rsp;
918 
919 vneg_out:
920         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
921 out_free_rsp:
922         kfree(pneg_rsp);
923 out_free_inbuf:
924         kfree(pneg_inbuf);
925         return rc;
926 }
927 
928 enum securityEnum
929 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
930 {
931         switch (requested) {
932         case Kerberos:
933         case RawNTLMSSP:
934                 return requested;
935         case NTLMv2:
936                 return RawNTLMSSP;
937         case Unspecified:
938                 if (server->sec_ntlmssp &&
939                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
940                         return RawNTLMSSP;
941                 if ((server->sec_kerberos || server->sec_mskerberos) &&
942                         (global_secflags & CIFSSEC_MAY_KRB5))
943                         return Kerberos;
944                 /* Fallthrough */
945         default:
946                 return Unspecified;
947         }
948 }
949 
950 struct SMB2_sess_data {
951         unsigned int xid;
952         struct cifs_ses *ses;
953         struct nls_table *nls_cp;
954         void (*func)(struct SMB2_sess_data *);
955         int result;
956         u64 previous_session;
957 
958         /* we will send the SMB in three pieces:
959          * a fixed length beginning part, an optional
960          * SPNEGO blob (which can be zero length), and a
961          * last part which will include the strings
962          * and rest of bcc area. This allows us to avoid
963          * a large buffer 17K allocation
964          */
965         int buf0_type;
966         struct kvec iov[2];
967 };
968 
969 static int
970 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
971 {
972         int rc;
973         struct cifs_ses *ses = sess_data->ses;
974         struct smb2_sess_setup_req *req;
975         struct TCP_Server_Info *server = ses->server;
976         unsigned int total_len;
977 
978         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
979                              &total_len);
980         if (rc)
981                 return rc;
982 
983         /* First session, not a reauthenticate */
984         req->sync_hdr.SessionId = 0;
985 
986         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
987         req->PreviousSessionId = sess_data->previous_session;
988 
989         req->Flags = 0; /* MBZ */
990 
991         /* enough to enable echos and oplocks and one max size write */
992         req->sync_hdr.CreditRequest = cpu_to_le16(130);
993 
994         /* only one of SMB2 signing flags may be set in SMB2 request */
995         if (server->sign)
996                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
997         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
998                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
999         else
1000                 req->SecurityMode = 0;
1001 
1002         req->Capabilities = 0;
1003         req->Channel = 0; /* MBZ */
1004 
1005         sess_data->iov[0].iov_base = (char *)req;
1006         /* 1 for pad */
1007         sess_data->iov[0].iov_len = total_len - 1;
1008         /*
1009          * This variable will be used to clear the buffer
1010          * allocated above in case of any error in the calling function.
1011          */
1012         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1013 
1014         return 0;
1015 }
1016 
1017 static void
1018 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1019 {
1020         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1021         sess_data->buf0_type = CIFS_NO_BUFFER;
1022 }
1023 
1024 static int
1025 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1026 {
1027         int rc;
1028         struct smb_rqst rqst;
1029         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1030         struct kvec rsp_iov = { NULL, 0 };
1031 
1032         /* Testing shows that buffer offset must be at location of Buffer[0] */
1033         req->SecurityBufferOffset =
1034                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1035         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1036 
1037         memset(&rqst, 0, sizeof(struct smb_rqst));
1038         rqst.rq_iov = sess_data->iov;
1039         rqst.rq_nvec = 2;
1040 
1041         /* BB add code to build os and lm fields */
1042         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1043                             &rqst,
1044                             &sess_data->buf0_type,
1045                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1046         cifs_small_buf_release(sess_data->iov[0].iov_base);
1047         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1048 
1049         return rc;
1050 }
1051 
1052 static int
1053 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1054 {
1055         int rc = 0;
1056         struct cifs_ses *ses = sess_data->ses;
1057 
1058         mutex_lock(&ses->server->srv_mutex);
1059         if (ses->server->ops->generate_signingkey) {
1060                 rc = ses->server->ops->generate_signingkey(ses);
1061                 if (rc) {
1062                         cifs_dbg(FYI,
1063                                 "SMB3 session key generation failed\n");
1064                         mutex_unlock(&ses->server->srv_mutex);
1065                         return rc;
1066                 }
1067         }
1068         if (!ses->server->session_estab) {
1069                 ses->server->sequence_number = 0x2;
1070                 ses->server->session_estab = true;
1071         }
1072         mutex_unlock(&ses->server->srv_mutex);
1073 
1074         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1075         spin_lock(&GlobalMid_Lock);
1076         ses->status = CifsGood;
1077         ses->need_reconnect = false;
1078         spin_unlock(&GlobalMid_Lock);
1079         return rc;
1080 }
1081 
1082 #ifdef CONFIG_CIFS_UPCALL
1083 static void
1084 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1085 {
1086         int rc;
1087         struct cifs_ses *ses = sess_data->ses;
1088         struct cifs_spnego_msg *msg;
1089         struct key *spnego_key = NULL;
1090         struct smb2_sess_setup_rsp *rsp = NULL;
1091 
1092         rc = SMB2_sess_alloc_buffer(sess_data);
1093         if (rc)
1094                 goto out;
1095 
1096         spnego_key = cifs_get_spnego_key(ses);
1097         if (IS_ERR(spnego_key)) {
1098                 rc = PTR_ERR(spnego_key);
1099                 spnego_key = NULL;
1100                 goto out;
1101         }
1102 
1103         msg = spnego_key->payload.data[0];
1104         /*
1105          * check version field to make sure that cifs.upcall is
1106          * sending us a response in an expected form
1107          */
1108         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1109                 cifs_dbg(VFS,
1110                           "bad cifs.upcall version. Expected %d got %d",
1111                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1112                 rc = -EKEYREJECTED;
1113                 goto out_put_spnego_key;
1114         }
1115 
1116         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1117                                          GFP_KERNEL);
1118         if (!ses->auth_key.response) {
1119                 cifs_dbg(VFS,
1120                         "Kerberos can't allocate (%u bytes) memory",
1121                         msg->sesskey_len);
1122                 rc = -ENOMEM;
1123                 goto out_put_spnego_key;
1124         }
1125         ses->auth_key.len = msg->sesskey_len;
1126 
1127         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1128         sess_data->iov[1].iov_len = msg->secblob_len;
1129 
1130         rc = SMB2_sess_sendreceive(sess_data);
1131         if (rc)
1132                 goto out_put_spnego_key;
1133 
1134         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1135         ses->Suid = rsp->sync_hdr.SessionId;
1136 
1137         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1138 
1139         rc = SMB2_sess_establish_session(sess_data);
1140 out_put_spnego_key:
1141         key_invalidate(spnego_key);
1142         key_put(spnego_key);
1143 out:
1144         sess_data->result = rc;
1145         sess_data->func = NULL;
1146         SMB2_sess_free_buffer(sess_data);
1147 }
1148 #else
1149 static void
1150 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1151 {
1152         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1153         sess_data->result = -EOPNOTSUPP;
1154         sess_data->func = NULL;
1155 }
1156 #endif
1157 
1158 static void
1159 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1160 
1161 static void
1162 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1163 {
1164         int rc;
1165         struct cifs_ses *ses = sess_data->ses;
1166         struct smb2_sess_setup_rsp *rsp = NULL;
1167         char *ntlmssp_blob = NULL;
1168         bool use_spnego = false; /* else use raw ntlmssp */
1169         u16 blob_length = 0;
1170 
1171         /*
1172          * If memory allocation is successful, caller of this function
1173          * frees it.
1174          */
1175         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1176         if (!ses->ntlmssp) {
1177                 rc = -ENOMEM;
1178                 goto out_err;
1179         }
1180         ses->ntlmssp->sesskey_per_smbsess = true;
1181 
1182         rc = SMB2_sess_alloc_buffer(sess_data);
1183         if (rc)
1184                 goto out_err;
1185 
1186         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1187                                GFP_KERNEL);
1188         if (ntlmssp_blob == NULL) {
1189                 rc = -ENOMEM;
1190                 goto out;
1191         }
1192 
1193         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1194         if (use_spnego) {
1195                 /* BB eventually need to add this */
1196                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1197                 rc = -EOPNOTSUPP;
1198                 goto out;
1199         } else {
1200                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1201                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1202         }
1203         sess_data->iov[1].iov_base = ntlmssp_blob;
1204         sess_data->iov[1].iov_len = blob_length;
1205 
1206         rc = SMB2_sess_sendreceive(sess_data);
1207         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1208 
1209         /* If true, rc here is expected and not an error */
1210         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1211                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1212                 rc = 0;
1213 
1214         if (rc)
1215                 goto out;
1216 
1217         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1218                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1219                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1220                         le16_to_cpu(rsp->SecurityBufferOffset));
1221                 rc = -EIO;
1222                 goto out;
1223         }
1224         rc = decode_ntlmssp_challenge(rsp->Buffer,
1225                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1226         if (rc)
1227                 goto out;
1228 
1229         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1230 
1231 
1232         ses->Suid = rsp->sync_hdr.SessionId;
1233         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234 
1235 out:
1236         kfree(ntlmssp_blob);
1237         SMB2_sess_free_buffer(sess_data);
1238         if (!rc) {
1239                 sess_data->result = 0;
1240                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1241                 return;
1242         }
1243 out_err:
1244         kfree(ses->ntlmssp);
1245         ses->ntlmssp = NULL;
1246         sess_data->result = rc;
1247         sess_data->func = NULL;
1248 }
1249 
1250 static void
1251 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1252 {
1253         int rc;
1254         struct cifs_ses *ses = sess_data->ses;
1255         struct smb2_sess_setup_req *req;
1256         struct smb2_sess_setup_rsp *rsp = NULL;
1257         unsigned char *ntlmssp_blob = NULL;
1258         bool use_spnego = false; /* else use raw ntlmssp */
1259         u16 blob_length = 0;
1260 
1261         rc = SMB2_sess_alloc_buffer(sess_data);
1262         if (rc)
1263                 goto out;
1264 
1265         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1266         req->sync_hdr.SessionId = ses->Suid;
1267 
1268         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1269                                         sess_data->nls_cp);
1270         if (rc) {
1271                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1272                 goto out;
1273         }
1274 
1275         if (use_spnego) {
1276                 /* BB eventually need to add this */
1277                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1278                 rc = -EOPNOTSUPP;
1279                 goto out;
1280         }
1281         sess_data->iov[1].iov_base = ntlmssp_blob;
1282         sess_data->iov[1].iov_len = blob_length;
1283 
1284         rc = SMB2_sess_sendreceive(sess_data);
1285         if (rc)
1286                 goto out;
1287 
1288         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1289 
1290         ses->Suid = rsp->sync_hdr.SessionId;
1291         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1292 
1293         rc = SMB2_sess_establish_session(sess_data);
1294 out:
1295         kfree(ntlmssp_blob);
1296         SMB2_sess_free_buffer(sess_data);
1297         kfree(ses->ntlmssp);
1298         ses->ntlmssp = NULL;
1299         sess_data->result = rc;
1300         sess_data->func = NULL;
1301 }
1302 
1303 static int
1304 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1305 {
1306         int type;
1307 
1308         type = smb2_select_sectype(ses->server, ses->sectype);
1309         cifs_dbg(FYI, "sess setup type %d\n", type);
1310         if (type == Unspecified) {
1311                 cifs_dbg(VFS,
1312                         "Unable to select appropriate authentication method!");
1313                 return -EINVAL;
1314         }
1315 
1316         switch (type) {
1317         case Kerberos:
1318                 sess_data->func = SMB2_auth_kerberos;
1319                 break;
1320         case RawNTLMSSP:
1321                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1322                 break;
1323         default:
1324                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1325                 return -EOPNOTSUPP;
1326         }
1327 
1328         return 0;
1329 }
1330 
1331 int
1332 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1333                 const struct nls_table *nls_cp)
1334 {
1335         int rc = 0;
1336         struct TCP_Server_Info *server = ses->server;
1337         struct SMB2_sess_data *sess_data;
1338 
1339         cifs_dbg(FYI, "Session Setup\n");
1340 
1341         if (!server) {
1342                 WARN(1, "%s: server is NULL!\n", __func__);
1343                 return -EIO;
1344         }
1345 
1346         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1347         if (!sess_data)
1348                 return -ENOMEM;
1349 
1350         rc = SMB2_select_sec(ses, sess_data);
1351         if (rc)
1352                 goto out;
1353         sess_data->xid = xid;
1354         sess_data->ses = ses;
1355         sess_data->buf0_type = CIFS_NO_BUFFER;
1356         sess_data->nls_cp = (struct nls_table *) nls_cp;
1357         sess_data->previous_session = ses->Suid;
1358 
1359         /*
1360          * Initialize the session hash with the server one.
1361          */
1362         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1363                SMB2_PREAUTH_HASH_SIZE);
1364 
1365         while (sess_data->func)
1366                 sess_data->func(sess_data);
1367 
1368         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1369                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1370         rc = sess_data->result;
1371 out:
1372         kfree(sess_data);
1373         return rc;
1374 }
1375 
1376 int
1377 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1378 {
1379         struct smb_rqst rqst;
1380         struct smb2_logoff_req *req; /* response is also trivial struct */
1381         int rc = 0;
1382         struct TCP_Server_Info *server;
1383         int flags = 0;
1384         unsigned int total_len;
1385         struct kvec iov[1];
1386         struct kvec rsp_iov;
1387         int resp_buf_type;
1388 
1389         cifs_dbg(FYI, "disconnect session %p\n", ses);
1390 
1391         if (ses && (ses->server))
1392                 server = ses->server;
1393         else
1394                 return -EIO;
1395 
1396         /* no need to send SMB logoff if uid already closed due to reconnect */
1397         if (ses->need_reconnect)
1398                 goto smb2_session_already_dead;
1399 
1400         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1401         if (rc)
1402                 return rc;
1403 
1404          /* since no tcon, smb2_init can not do this, so do here */
1405         req->sync_hdr.SessionId = ses->Suid;
1406 
1407         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1408                 flags |= CIFS_TRANSFORM_REQ;
1409         else if (server->sign)
1410                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1411 
1412         flags |= CIFS_NO_RESP;
1413 
1414         iov[0].iov_base = (char *)req;
1415         iov[0].iov_len = total_len;
1416 
1417         memset(&rqst, 0, sizeof(struct smb_rqst));
1418         rqst.rq_iov = iov;
1419         rqst.rq_nvec = 1;
1420 
1421         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1422         cifs_small_buf_release(req);
1423         /*
1424          * No tcon so can't do
1425          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1426          */
1427 
1428 smb2_session_already_dead:
1429         return rc;
1430 }
1431 
1432 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1433 {
1434         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1435 }
1436 
1437 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1438 
1439 /* These are similar values to what Windows uses */
1440 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1441 {
1442         tcon->max_chunks = 256;
1443         tcon->max_bytes_chunk = 1048576;
1444         tcon->max_bytes_copy = 16777216;
1445 }
1446 
1447 int
1448 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1449           struct cifs_tcon *tcon, const struct nls_table *cp)
1450 {
1451         struct smb_rqst rqst;
1452         struct smb2_tree_connect_req *req;
1453         struct smb2_tree_connect_rsp *rsp = NULL;
1454         struct kvec iov[2];
1455         struct kvec rsp_iov = { NULL, 0 };
1456         int rc = 0;
1457         int resp_buftype;
1458         int unc_path_len;
1459         __le16 *unc_path = NULL;
1460         int flags = 0;
1461         unsigned int total_len;
1462 
1463         cifs_dbg(FYI, "TCON\n");
1464 
1465         if (!(ses->server) || !tree)
1466                 return -EIO;
1467 
1468         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1469         if (unc_path == NULL)
1470                 return -ENOMEM;
1471 
1472         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1473         unc_path_len *= 2;
1474         if (unc_path_len < 2) {
1475                 kfree(unc_path);
1476                 return -EINVAL;
1477         }
1478 
1479         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1480         tcon->tid = 0;
1481         atomic_set(&tcon->num_remote_opens, 0);
1482         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1483                              &total_len);
1484         if (rc) {
1485                 kfree(unc_path);
1486                 return rc;
1487         }
1488 
1489         if (smb3_encryption_required(tcon))
1490                 flags |= CIFS_TRANSFORM_REQ;
1491 
1492         iov[0].iov_base = (char *)req;
1493         /* 1 for pad */
1494         iov[0].iov_len = total_len - 1;
1495 
1496         /* Testing shows that buffer offset must be at location of Buffer[0] */
1497         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1498                         - 1 /* pad */);
1499         req->PathLength = cpu_to_le16(unc_path_len - 2);
1500         iov[1].iov_base = unc_path;
1501         iov[1].iov_len = unc_path_len;
1502 
1503         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1504         if ((ses->server->dialect == SMB311_PROT_ID) &&
1505             !smb3_encryption_required(tcon))
1506                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507 
1508         memset(&rqst, 0, sizeof(struct smb_rqst));
1509         rqst.rq_iov = iov;
1510         rqst.rq_nvec = 2;
1511 
1512         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1513         cifs_small_buf_release(req);
1514         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1515         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1516         if (rc != 0) {
1517                 if (tcon) {
1518                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519                         tcon->need_reconnect = true;
1520                 }
1521                 goto tcon_error_exit;
1522         }
1523 
1524         switch (rsp->ShareType) {
1525         case SMB2_SHARE_TYPE_DISK:
1526                 cifs_dbg(FYI, "connection to disk share\n");
1527                 break;
1528         case SMB2_SHARE_TYPE_PIPE:
1529                 tcon->pipe = true;
1530                 cifs_dbg(FYI, "connection to pipe share\n");
1531                 break;
1532         case SMB2_SHARE_TYPE_PRINT:
1533                 tcon->print = true;
1534                 cifs_dbg(FYI, "connection to printer\n");
1535                 break;
1536         default:
1537                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538                 rc = -EOPNOTSUPP;
1539                 goto tcon_error_exit;
1540         }
1541 
1542         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545         tcon->tidStatus = CifsGood;
1546         tcon->need_reconnect = false;
1547         tcon->tid = rsp->sync_hdr.TreeId;
1548         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549 
1550         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553 
1554         if (tcon->seal &&
1555             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557 
1558         init_copy_chunk_defaults(tcon);
1559         if (tcon->ses->server->ops->validate_negotiate)
1560                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561 tcon_exit:
1562 
1563         free_rsp_buf(resp_buftype, rsp);
1564         kfree(unc_path);
1565         return rc;
1566 
1567 tcon_error_exit:
1568         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1569                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1570         }
1571         goto tcon_exit;
1572 }
1573 
1574 int
1575 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1576 {
1577         struct smb_rqst rqst;
1578         struct smb2_tree_disconnect_req *req; /* response is trivial */
1579         int rc = 0;
1580         struct cifs_ses *ses = tcon->ses;
1581         int flags = 0;
1582         unsigned int total_len;
1583         struct kvec iov[1];
1584         struct kvec rsp_iov;
1585         int resp_buf_type;
1586 
1587         cifs_dbg(FYI, "Tree Disconnect\n");
1588 
1589         if (!ses || !(ses->server))
1590                 return -EIO;
1591 
1592         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1593                 return 0;
1594 
1595         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1596                              &total_len);
1597         if (rc)
1598                 return rc;
1599 
1600         if (smb3_encryption_required(tcon))
1601                 flags |= CIFS_TRANSFORM_REQ;
1602 
1603         flags |= CIFS_NO_RESP;
1604 
1605         iov[0].iov_base = (char *)req;
1606         iov[0].iov_len = total_len;
1607 
1608         memset(&rqst, 0, sizeof(struct smb_rqst));
1609         rqst.rq_iov = iov;
1610         rqst.rq_nvec = 1;
1611 
1612         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1613         cifs_small_buf_release(req);
1614         if (rc)
1615                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1616 
1617         return rc;
1618 }
1619 
1620 
1621 static struct create_durable *
1622 create_durable_buf(void)
1623 {
1624         struct create_durable *buf;
1625 
1626         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1627         if (!buf)
1628                 return NULL;
1629 
1630         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1631                                         (struct create_durable, Data));
1632         buf->ccontext.DataLength = cpu_to_le32(16);
1633         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1634                                 (struct create_durable, Name));
1635         buf->ccontext.NameLength = cpu_to_le16(4);
1636         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1637         buf->Name[0] = 'D';
1638         buf->Name[1] = 'H';
1639         buf->Name[2] = 'n';
1640         buf->Name[3] = 'Q';
1641         return buf;
1642 }
1643 
1644 static struct create_durable *
1645 create_reconnect_durable_buf(struct cifs_fid *fid)
1646 {
1647         struct create_durable *buf;
1648 
1649         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1650         if (!buf)
1651                 return NULL;
1652 
1653         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1654                                         (struct create_durable, Data));
1655         buf->ccontext.DataLength = cpu_to_le32(16);
1656         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1657                                 (struct create_durable, Name));
1658         buf->ccontext.NameLength = cpu_to_le16(4);
1659         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1660         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1661         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1662         buf->Name[0] = 'D';
1663         buf->Name[1] = 'H';
1664         buf->Name[2] = 'n';
1665         buf->Name[3] = 'C';
1666         return buf;
1667 }
1668 
1669 static __u8
1670 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1671                   unsigned int *epoch, char *lease_key)
1672 {
1673         char *data_offset;
1674         struct create_context *cc;
1675         unsigned int next;
1676         unsigned int remaining;
1677         char *name;
1678 
1679         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1680         remaining = le32_to_cpu(rsp->CreateContextsLength);
1681         cc = (struct create_context *)data_offset;
1682         while (remaining >= sizeof(struct create_context)) {
1683                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1684                 if (le16_to_cpu(cc->NameLength) == 4 &&
1685                     strncmp(name, "RqLs", 4) == 0)
1686                         return server->ops->parse_lease_buf(cc, epoch,
1687                                                             lease_key);
1688 
1689                 next = le32_to_cpu(cc->Next);
1690                 if (!next)
1691                         break;
1692                 remaining -= next;
1693                 cc = (struct create_context *)((char *)cc + next);
1694         }
1695 
1696         return 0;
1697 }
1698 
1699 static int
1700 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1701                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1702 {
1703         struct smb2_create_req *req = iov[0].iov_base;
1704         unsigned int num = *num_iovec;
1705 
1706         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1707         if (iov[num].iov_base == NULL)
1708                 return -ENOMEM;
1709         iov[num].iov_len = server->vals->create_lease_size;
1710         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1711         if (!req->CreateContextsOffset)
1712                 req->CreateContextsOffset = cpu_to_le32(
1713                                 sizeof(struct smb2_create_req) +
1714                                 iov[num - 1].iov_len);
1715         le32_add_cpu(&req->CreateContextsLength,
1716                      server->vals->create_lease_size);
1717         *num_iovec = num + 1;
1718         return 0;
1719 }
1720 
1721 static struct create_durable_v2 *
1722 create_durable_v2_buf(struct cifs_fid *pfid)
1723 {
1724         struct create_durable_v2 *buf;
1725 
1726         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1727         if (!buf)
1728                 return NULL;
1729 
1730         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1731                                         (struct create_durable_v2, dcontext));
1732         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1733         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1734                                 (struct create_durable_v2, Name));
1735         buf->ccontext.NameLength = cpu_to_le16(4);
1736 
1737         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1738         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1739         generate_random_uuid(buf->dcontext.CreateGuid);
1740         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1741 
1742         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1743         buf->Name[0] = 'D';
1744         buf->Name[1] = 'H';
1745         buf->Name[2] = '2';
1746         buf->Name[3] = 'Q';
1747         return buf;
1748 }
1749 
1750 static struct create_durable_handle_reconnect_v2 *
1751 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1752 {
1753         struct create_durable_handle_reconnect_v2 *buf;
1754 
1755         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1756                         GFP_KERNEL);
1757         if (!buf)
1758                 return NULL;
1759 
1760         buf->ccontext.DataOffset =
1761                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1762                                      dcontext));
1763         buf->ccontext.DataLength =
1764                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1765         buf->ccontext.NameOffset =
1766                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1767                             Name));
1768         buf->ccontext.NameLength = cpu_to_le16(4);
1769 
1770         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1771         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1772         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1773         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1774 
1775         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1776         buf->Name[0] = 'D';
1777         buf->Name[1] = 'H';
1778         buf->Name[2] = '2';
1779         buf->Name[3] = 'C';
1780         return buf;
1781 }
1782 
1783 static int
1784 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1785                     struct cifs_open_parms *oparms)
1786 {
1787         struct smb2_create_req *req = iov[0].iov_base;
1788         unsigned int num = *num_iovec;
1789 
1790         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1791         if (iov[num].iov_base == NULL)
1792                 return -ENOMEM;
1793         iov[num].iov_len = sizeof(struct create_durable_v2);
1794         if (!req->CreateContextsOffset)
1795                 req->CreateContextsOffset =
1796                         cpu_to_le32(sizeof(struct smb2_create_req) +
1797                                                                 iov[1].iov_len);
1798         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1799         *num_iovec = num + 1;
1800         return 0;
1801 }
1802 
1803 static int
1804 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1805                     struct cifs_open_parms *oparms)
1806 {
1807         struct smb2_create_req *req = iov[0].iov_base;
1808         unsigned int num = *num_iovec;
1809 
1810         /* indicate that we don't need to relock the file */
1811         oparms->reconnect = false;
1812 
1813         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1814         if (iov[num].iov_base == NULL)
1815                 return -ENOMEM;
1816         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1817         if (!req->CreateContextsOffset)
1818                 req->CreateContextsOffset =
1819                         cpu_to_le32(sizeof(struct smb2_create_req) +
1820                                                                 iov[1].iov_len);
1821         le32_add_cpu(&req->CreateContextsLength,
1822                         sizeof(struct create_durable_handle_reconnect_v2));
1823         *num_iovec = num + 1;
1824         return 0;
1825 }
1826 
1827 static int
1828 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1829                     struct cifs_open_parms *oparms, bool use_persistent)
1830 {
1831         struct smb2_create_req *req = iov[0].iov_base;
1832         unsigned int num = *num_iovec;
1833 
1834         if (use_persistent) {
1835                 if (oparms->reconnect)
1836                         return add_durable_reconnect_v2_context(iov, num_iovec,
1837                                                                 oparms);
1838                 else
1839                         return add_durable_v2_context(iov, num_iovec, oparms);
1840         }
1841 
1842         if (oparms->reconnect) {
1843                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1844                 /* indicate that we don't need to relock the file */
1845                 oparms->reconnect = false;
1846         } else
1847                 iov[num].iov_base = create_durable_buf();
1848         if (iov[num].iov_base == NULL)
1849                 return -ENOMEM;
1850         iov[num].iov_len = sizeof(struct create_durable);
1851         if (!req->CreateContextsOffset)
1852                 req->CreateContextsOffset =
1853                         cpu_to_le32(sizeof(struct smb2_create_req) +
1854                                                                 iov[1].iov_len);
1855         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1856         *num_iovec = num + 1;
1857         return 0;
1858 }
1859 
1860 /* See MS-SMB2 2.2.13.2.7 */
1861 static struct crt_twarp_ctxt *
1862 create_twarp_buf(__u64 timewarp)
1863 {
1864         struct crt_twarp_ctxt *buf;
1865 
1866         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1867         if (!buf)
1868                 return NULL;
1869 
1870         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1871                                         (struct crt_twarp_ctxt, Timestamp));
1872         buf->ccontext.DataLength = cpu_to_le32(8);
1873         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1874                                 (struct crt_twarp_ctxt, Name));
1875         buf->ccontext.NameLength = cpu_to_le16(4);
1876         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1877         buf->Name[0] = 'T';
1878         buf->Name[1] = 'W';
1879         buf->Name[2] = 'r';
1880         buf->Name[3] = 'p';
1881         buf->Timestamp = cpu_to_le64(timewarp);
1882         return buf;
1883 }
1884 
1885 /* See MS-SMB2 2.2.13.2.7 */
1886 static int
1887 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1888 {
1889         struct smb2_create_req *req = iov[0].iov_base;
1890         unsigned int num = *num_iovec;
1891 
1892         iov[num].iov_base = create_twarp_buf(timewarp);
1893         if (iov[num].iov_base == NULL)
1894                 return -ENOMEM;
1895         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1896         if (!req->CreateContextsOffset)
1897                 req->CreateContextsOffset = cpu_to_le32(
1898                                 sizeof(struct smb2_create_req) +
1899                                 iov[num - 1].iov_len);
1900         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1901         *num_iovec = num + 1;
1902         return 0;
1903 }
1904 
1905 static int
1906 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1907                             const char *treename, const __le16 *path)
1908 {
1909         int treename_len, path_len;
1910         struct nls_table *cp;
1911         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1912 
1913         /*
1914          * skip leading "\\"
1915          */
1916         treename_len = strlen(treename);
1917         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1918                 return -EINVAL;
1919 
1920         treename += 2;
1921         treename_len -= 2;
1922 
1923         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1924 
1925         /*
1926          * make room for one path separator between the treename and
1927          * path
1928          */
1929         *out_len = treename_len + 1 + path_len;
1930 
1931         /*
1932          * final path needs to be null-terminated UTF16 with a
1933          * size aligned to 8
1934          */
1935 
1936         *out_size = roundup((*out_len+1)*2, 8);
1937         *out_path = kzalloc(*out_size, GFP_KERNEL);
1938         if (!*out_path)
1939                 return -ENOMEM;
1940 
1941         cp = load_nls_default();
1942         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1943         UniStrcat(*out_path, sep);
1944         UniStrcat(*out_path, path);
1945         unload_nls(cp);
1946 
1947         return 0;
1948 }
1949 
1950 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1951                                umode_t mode, struct cifs_tcon *tcon,
1952                                const char *full_path,
1953                                struct cifs_sb_info *cifs_sb)
1954 {
1955         struct smb_rqst rqst;
1956         struct smb2_create_req *req;
1957         struct smb2_create_rsp *rsp = NULL;
1958         struct TCP_Server_Info *server;
1959         struct cifs_ses *ses = tcon->ses;
1960         struct kvec iov[3]; /* make sure at least one for each open context */
1961         struct kvec rsp_iov = {NULL, 0};
1962         int resp_buftype;
1963         int uni_path_len;
1964         __le16 *copy_path = NULL;
1965         int copy_size;
1966         int rc = 0;
1967         unsigned int n_iov = 2;
1968         __u32 file_attributes = 0;
1969         char *pc_buf = NULL;
1970         int flags = 0;
1971         unsigned int total_len;
1972         __le16 *utf16_path = NULL;
1973 
1974         cifs_dbg(FYI, "mkdir\n");
1975 
1976         /* resource #1: path allocation */
1977         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1978         if (!utf16_path)
1979                 return -ENOMEM;
1980 
1981         if (ses && (ses->server))
1982                 server = ses->server;
1983         else {
1984                 rc = -EIO;
1985                 goto err_free_path;
1986         }
1987 
1988         /* resource #2: request */
1989         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1990         if (rc)
1991                 goto err_free_path;
1992 
1993 
1994         if (smb3_encryption_required(tcon))
1995                 flags |= CIFS_TRANSFORM_REQ;
1996 
1997         req->ImpersonationLevel = IL_IMPERSONATION;
1998         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1999         /* File attributes ignored on open (used in create though) */
2000         req->FileAttributes = cpu_to_le32(file_attributes);
2001         req->ShareAccess = FILE_SHARE_ALL_LE;
2002         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2003         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2004 
2005         iov[0].iov_base = (char *)req;
2006         /* -1 since last byte is buf[0] which is sent below (path) */
2007         iov[0].iov_len = total_len - 1;
2008 
2009         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2010 
2011         /* [MS-SMB2] 2.2.13 NameOffset:
2012          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2013          * the SMB2 header, the file name includes a prefix that will
2014          * be processed during DFS name normalization as specified in
2015          * section 3.3.5.9. Otherwise, the file name is relative to
2016          * the share that is identified by the TreeId in the SMB2
2017          * header.
2018          */
2019         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2020                 int name_len;
2021 
2022                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2023                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2024                                                  &name_len,
2025                                                  tcon->treeName, utf16_path);
2026                 if (rc)
2027                         goto err_free_req;
2028 
2029                 req->NameLength = cpu_to_le16(name_len * 2);
2030                 uni_path_len = copy_size;
2031                 /* free before overwriting resource */
2032                 kfree(utf16_path);
2033                 utf16_path = copy_path;
2034         } else {
2035                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2036                 /* MUST set path len (NameLength) to 0 opening root of share */
2037                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2038                 if (uni_path_len % 8 != 0) {
2039                         copy_size = roundup(uni_path_len, 8);
2040                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2041                         if (!copy_path) {
2042                                 rc = -ENOMEM;
2043                                 goto err_free_req;
2044                         }
2045                         memcpy((char *)copy_path, (const char *)utf16_path,
2046                                uni_path_len);
2047                         uni_path_len = copy_size;
2048                         /* free before overwriting resource */
2049                         kfree(utf16_path);
2050                         utf16_path = copy_path;
2051                 }
2052         }
2053 
2054         iov[1].iov_len = uni_path_len;
2055         iov[1].iov_base = utf16_path;
2056         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2057 
2058         if (tcon->posix_extensions) {
2059                 /* resource #3: posix buf */
2060                 rc = add_posix_context(iov, &n_iov, mode);
2061                 if (rc)
2062                         goto err_free_req;
2063                 pc_buf = iov[n_iov-1].iov_base;
2064         }
2065 
2066 
2067         memset(&rqst, 0, sizeof(struct smb_rqst));
2068         rqst.rq_iov = iov;
2069         rqst.rq_nvec = n_iov;
2070 
2071         /* resource #4: response buffer */
2072         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2073         if (rc) {
2074                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2075                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2076                                            CREATE_NOT_FILE,
2077                                            FILE_WRITE_ATTRIBUTES, rc);
2078                 goto err_free_rsp_buf;
2079         }
2080 
2081         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2082         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2083                                     ses->Suid, CREATE_NOT_FILE,
2084                                     FILE_WRITE_ATTRIBUTES);
2085 
2086         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2087 
2088         /* Eventually save off posix specific response info and timestaps */
2089 
2090 err_free_rsp_buf:
2091         free_rsp_buf(resp_buftype, rsp);
2092         kfree(pc_buf);
2093 err_free_req:
2094         cifs_small_buf_release(req);
2095 err_free_path:
2096         kfree(utf16_path);
2097         return rc;
2098 }
2099 
2100 int
2101 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2102                struct cifs_open_parms *oparms, __le16 *path)
2103 {
2104         struct TCP_Server_Info *server = tcon->ses->server;
2105         struct smb2_create_req *req;
2106         unsigned int n_iov = 2;
2107         __u32 file_attributes = 0;
2108         int copy_size;
2109         int uni_path_len;
2110         unsigned int total_len;
2111         struct kvec *iov = rqst->rq_iov;
2112         __le16 *copy_path;
2113         int rc;
2114 
2115         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2116         if (rc)
2117                 return rc;
2118 
2119         iov[0].iov_base = (char *)req;
2120         /* -1 since last byte is buf[0] which is sent below (path) */
2121         iov[0].iov_len = total_len - 1;
2122 
2123         if (oparms->create_options & CREATE_OPTION_READONLY)
2124                 file_attributes |= ATTR_READONLY;
2125         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2126                 file_attributes |= ATTR_SYSTEM;
2127 
2128         req->ImpersonationLevel = IL_IMPERSONATION;
2129         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2130         /* File attributes ignored on open (used in create though) */
2131         req->FileAttributes = cpu_to_le32(file_attributes);
2132         req->ShareAccess = FILE_SHARE_ALL_LE;
2133         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2134         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2135         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2136 
2137         /* [MS-SMB2] 2.2.13 NameOffset:
2138          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2139          * the SMB2 header, the file name includes a prefix that will
2140          * be processed during DFS name normalization as specified in
2141          * section 3.3.5.9. Otherwise, the file name is relative to
2142          * the share that is identified by the TreeId in the SMB2
2143          * header.
2144          */
2145         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2146                 int name_len;
2147 
2148                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2149                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2150                                                  &name_len,
2151                                                  tcon->treeName, path);
2152                 if (rc)
2153                         return rc;
2154                 req->NameLength = cpu_to_le16(name_len * 2);
2155                 uni_path_len = copy_size;
2156                 path = copy_path;
2157         } else {
2158                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2159                 /* MUST set path len (NameLength) to 0 opening root of share */
2160                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2161                 copy_size = uni_path_len;
2162                 if (copy_size % 8 != 0)
2163                         copy_size = roundup(copy_size, 8);
2164                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2165                 if (!copy_path)
2166                         return -ENOMEM;
2167                 memcpy((char *)copy_path, (const char *)path,
2168                        uni_path_len);
2169                 uni_path_len = copy_size;
2170                 path = copy_path;
2171         }
2172 
2173         iov[1].iov_len = uni_path_len;
2174         iov[1].iov_base = path;
2175 
2176         if (!server->oplocks)
2177                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2178 
2179         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2180             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2181                 req->RequestedOplockLevel = *oplock;
2182         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2183                   (oparms->create_options & CREATE_NOT_FILE))
2184                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2185         else {
2186                 rc = add_lease_context(server, iov, &n_iov,
2187                                        oparms->fid->lease_key, oplock);
2188                 if (rc)
2189                         return rc;
2190         }
2191 
2192         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2193                 /* need to set Next field of lease context if we request it */
2194                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2195                         struct create_context *ccontext =
2196                             (struct create_context *)iov[n_iov-1].iov_base;
2197                         ccontext->Next =
2198                                 cpu_to_le32(server->vals->create_lease_size);
2199                 }
2200 
2201                 rc = add_durable_context(iov, &n_iov, oparms,
2202                                         tcon->use_persistent);
2203                 if (rc)
2204                         return rc;
2205         }
2206 
2207         if (tcon->posix_extensions) {
2208                 if (n_iov > 2) {
2209                         struct create_context *ccontext =
2210                             (struct create_context *)iov[n_iov-1].iov_base;
2211                         ccontext->Next =
2212                                 cpu_to_le32(iov[n_iov-1].iov_len);
2213                 }
2214 
2215                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2216                 if (rc)
2217                         return rc;
2218         }
2219 
2220         if (tcon->snapshot_time) {
2221                 cifs_dbg(FYI, "adding snapshot context\n");
2222                 if (n_iov > 2) {
2223                         struct create_context *ccontext =
2224                             (struct create_context *)iov[n_iov-1].iov_base;
2225                         ccontext->Next =
2226                                 cpu_to_le32(iov[n_iov-1].iov_len);
2227                 }
2228 
2229                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2230                 if (rc)
2231                         return rc;
2232         }
2233 
2234 
2235         rqst->rq_nvec = n_iov;
2236         return 0;
2237 }
2238 
2239 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2240  * All other vectors are freed by kfree().
2241  */
2242 void
2243 SMB2_open_free(struct smb_rqst *rqst)
2244 {
2245         int i;
2246 
2247         if (rqst && rqst->rq_iov) {
2248                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2249                 for (i = 1; i < rqst->rq_nvec; i++)
2250                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2251                                 kfree(rqst->rq_iov[i].iov_base);
2252         }
2253 }
2254 
2255 int
2256 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2257           __u8 *oplock, struct smb2_file_all_info *buf,
2258           struct kvec *err_iov, int *buftype)
2259 {
2260         struct smb_rqst rqst;
2261         struct smb2_create_rsp *rsp = NULL;
2262         struct TCP_Server_Info *server;
2263         struct cifs_tcon *tcon = oparms->tcon;
2264         struct cifs_ses *ses = tcon->ses;
2265         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2266         struct kvec rsp_iov = {NULL, 0};
2267         int resp_buftype = CIFS_NO_BUFFER;
2268         int rc = 0;
2269         int flags = 0;
2270 
2271         cifs_dbg(FYI, "create/open\n");
2272         if (ses && (ses->server))
2273                 server = ses->server;
2274         else
2275                 return -EIO;
2276 
2277         if (smb3_encryption_required(tcon))
2278                 flags |= CIFS_TRANSFORM_REQ;
2279 
2280         memset(&rqst, 0, sizeof(struct smb_rqst));
2281         memset(&iov, 0, sizeof(iov));
2282         rqst.rq_iov = iov;
2283         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2284 
2285         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2286         if (rc)
2287                 goto creat_exit;
2288 
2289         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2290                             &rsp_iov);
2291         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2292 
2293         if (rc != 0) {
2294                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2295                 if (err_iov && rsp) {
2296                         *err_iov = rsp_iov;
2297                         *buftype = resp_buftype;
2298                         resp_buftype = CIFS_NO_BUFFER;
2299                         rsp = NULL;
2300                 }
2301                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2302                                     oparms->create_options, oparms->desired_access, rc);
2303                 goto creat_exit;
2304         } else
2305                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2306                                      ses->Suid, oparms->create_options,
2307                                      oparms->desired_access);
2308 
2309         atomic_inc(&tcon->num_remote_opens);
2310         oparms->fid->persistent_fid = rsp->PersistentFileId;
2311         oparms->fid->volatile_fid = rsp->VolatileFileId;
2312 #ifdef CONFIG_CIFS_DEBUG2
2313         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2314 #endif /* CIFS_DEBUG2 */
2315 
2316         if (buf) {
2317                 memcpy(buf, &rsp->CreationTime, 32);
2318                 buf->AllocationSize = rsp->AllocationSize;
2319                 buf->EndOfFile = rsp->EndofFile;
2320                 buf->Attributes = rsp->FileAttributes;
2321                 buf->NumberOfLinks = cpu_to_le32(1);
2322                 buf->DeletePending = 0;
2323         }
2324 
2325         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2326                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2327                                             oparms->fid->lease_key);
2328         else
2329                 *oplock = rsp->OplockLevel;
2330 creat_exit:
2331         SMB2_open_free(&rqst);
2332         free_rsp_buf(resp_buftype, rsp);
2333         return rc;
2334 }
2335 
2336 /*
2337  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2338  */
2339 int
2340 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2341            u64 volatile_fid, u32 opcode, bool is_fsctl,
2342            char *in_data, u32 indatalen,
2343            char **out_data, u32 *plen /* returned data len */)
2344 {
2345         struct smb_rqst rqst;
2346         struct smb2_ioctl_req *req;
2347         struct smb2_ioctl_rsp *rsp;
2348         struct cifs_ses *ses;
2349         struct kvec iov[2];
2350         struct kvec rsp_iov;
2351         int resp_buftype;
2352         int n_iov;
2353         int rc = 0;
2354         int flags = 0;
2355         unsigned int total_len;
2356 
2357         cifs_dbg(FYI, "SMB2 IOCTL\n");
2358 
2359         if (out_data != NULL)
2360                 *out_data = NULL;
2361 
2362         /* zero out returned data len, in case of error */
2363         if (plen)
2364                 *plen = 0;
2365 
2366         if (tcon)
2367                 ses = tcon->ses;
2368         else
2369                 return -EIO;
2370 
2371         if (!ses || !(ses->server))
2372                 return -EIO;
2373 
2374         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2375         if (rc)
2376                 return rc;
2377 
2378         if (smb3_encryption_required(tcon))
2379                 flags |= CIFS_TRANSFORM_REQ;
2380 
2381         req->CtlCode = cpu_to_le32(opcode);
2382         req->PersistentFileId = persistent_fid;
2383         req->VolatileFileId = volatile_fid;
2384 
2385         if (indatalen) {
2386                 req->InputCount = cpu_to_le32(indatalen);
2387                 /* do not set InputOffset if no input data */
2388                 req->InputOffset =
2389                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2390                 iov[1].iov_base = in_data;
2391                 iov[1].iov_len = indatalen;
2392                 n_iov = 2;
2393         } else
2394                 n_iov = 1;
2395 
2396         req->OutputOffset = 0;
2397         req->OutputCount = 0; /* MBZ */
2398 
2399         /*
2400          * Could increase MaxOutputResponse, but that would require more
2401          * than one credit. Windows typically sets this smaller, but for some
2402          * ioctls it may be useful to allow server to send more. No point
2403          * limiting what the server can send as long as fits in one credit
2404          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2405          * (by default, note that it can be overridden to make max larger)
2406          * in responses (except for read responses which can be bigger.
2407          * We may want to bump this limit up
2408          */
2409         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2410 
2411         if (is_fsctl)
2412                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2413         else
2414                 req->Flags = 0;
2415 
2416         iov[0].iov_base = (char *)req;
2417 
2418         /*
2419          * If no input data, the size of ioctl struct in
2420          * protocol spec still includes a 1 byte data buffer,
2421          * but if input data passed to ioctl, we do not
2422          * want to double count this, so we do not send
2423          * the dummy one byte of data in iovec[0] if sending
2424          * input data (in iovec[1]).
2425          */
2426 
2427         if (indatalen) {
2428                 iov[0].iov_len = total_len - 1;
2429         } else
2430                 iov[0].iov_len = total_len;
2431 
2432         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2433         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2434                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2435 
2436         memset(&rqst, 0, sizeof(struct smb_rqst));
2437         rqst.rq_iov = iov;
2438         rqst.rq_nvec = n_iov;
2439 
2440         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2441                             &rsp_iov);
2442         cifs_small_buf_release(req);
2443         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2444 
2445         if (rc != 0)
2446                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2447                                 ses->Suid, 0, opcode, rc);
2448 
2449         if ((rc != 0) && (rc != -EINVAL)) {
2450                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2451                 goto ioctl_exit;
2452         } else if (rc == -EINVAL) {
2453                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2454                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2455                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2456                         goto ioctl_exit;
2457                 }
2458         }
2459 
2460         /* check if caller wants to look at return data or just return rc */
2461         if ((plen == NULL) || (out_data == NULL))
2462                 goto ioctl_exit;
2463 
2464         *plen = le32_to_cpu(rsp->OutputCount);
2465 
2466         /* We check for obvious errors in the output buffer length and offset */
2467         if (*plen == 0)
2468                 goto ioctl_exit; /* server returned no data */
2469         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2470                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2471                 *plen = 0;
2472                 rc = -EIO;
2473                 goto ioctl_exit;
2474         }
2475 
2476         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2477                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2478                         le32_to_cpu(rsp->OutputOffset));
2479                 *plen = 0;
2480                 rc = -EIO;
2481                 goto ioctl_exit;
2482         }
2483 
2484         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2485                             *plen, GFP_KERNEL);
2486         if (*out_data == NULL) {
2487                 rc = -ENOMEM;
2488                 goto ioctl_exit;
2489         }
2490 
2491 ioctl_exit:
2492         free_rsp_buf(resp_buftype, rsp);
2493         return rc;
2494 }
2495 
2496 /*
2497  *   Individual callers to ioctl worker function follow
2498  */
2499 
2500 int
2501 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2502                      u64 persistent_fid, u64 volatile_fid)
2503 {
2504         int rc;
2505         struct  compress_ioctl fsctl_input;
2506         char *ret_data = NULL;
2507 
2508         fsctl_input.CompressionState =
2509                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2510 
2511         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2512                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2513                         (char *)&fsctl_input /* data input */,
2514                         2 /* in data len */, &ret_data /* out data */, NULL);
2515 
2516         cifs_dbg(FYI, "set compression rc %d\n", rc);
2517 
2518         return rc;
2519 }
2520 
2521 int
2522 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2523                 u64 persistent_fid, u64 volatile_fid)
2524 {
2525         struct smb2_close_req *req;
2526         struct kvec *iov = rqst->rq_iov;
2527         unsigned int total_len;
2528         int rc;
2529 
2530         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2531         if (rc)
2532                 return rc;
2533 
2534         req->PersistentFileId = persistent_fid;
2535         req->VolatileFileId = volatile_fid;
2536         iov[0].iov_base = (char *)req;
2537         iov[0].iov_len = total_len;
2538 
2539         return 0;
2540 }
2541 
2542 void
2543 SMB2_close_free(struct smb_rqst *rqst)
2544 {
2545         if (rqst && rqst->rq_iov)
2546                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2547 }
2548 
2549 int
2550 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2551                  u64 persistent_fid, u64 volatile_fid, int flags)
2552 {
2553         struct smb_rqst rqst;
2554         struct smb2_close_rsp *rsp = NULL;
2555         struct cifs_ses *ses = tcon->ses;
2556         struct kvec iov[1];
2557         struct kvec rsp_iov;
2558         int resp_buftype = CIFS_NO_BUFFER;
2559         int rc = 0;
2560 
2561         cifs_dbg(FYI, "Close\n");
2562 
2563         if (!ses || !(ses->server))
2564                 return -EIO;
2565 
2566         if (smb3_encryption_required(tcon))
2567                 flags |= CIFS_TRANSFORM_REQ;
2568 
2569         memset(&rqst, 0, sizeof(struct smb_rqst));
2570         memset(&iov, 0, sizeof(iov));
2571         rqst.rq_iov = iov;
2572         rqst.rq_nvec = 1;
2573 
2574         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2575         if (rc)
2576                 goto close_exit;
2577 
2578         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2579         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2580 
2581         if (rc != 0) {
2582                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2583                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2584                                      rc);
2585                 goto close_exit;
2586         }
2587 
2588         atomic_dec(&tcon->num_remote_opens);
2589 
2590         /* BB FIXME - decode close response, update inode for caching */
2591 
2592 close_exit:
2593         SMB2_close_free(&rqst);
2594         free_rsp_buf(resp_buftype, rsp);
2595         return rc;
2596 }
2597 
2598 int
2599 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2600            u64 persistent_fid, u64 volatile_fid)
2601 {
2602         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2603 }
2604 
2605 int
2606 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2607                   struct kvec *iov, unsigned int min_buf_size)
2608 {
2609         unsigned int smb_len = iov->iov_len;
2610         char *end_of_smb = smb_len + (char *)iov->iov_base;
2611         char *begin_of_buf = offset + (char *)iov->iov_base;
2612         char *end_of_buf = begin_of_buf + buffer_length;
2613 
2614 
2615         if (buffer_length < min_buf_size) {
2616                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2617                          buffer_length, min_buf_size);
2618                 return -EINVAL;
2619         }
2620 
2621         /* check if beyond RFC1001 maximum length */
2622         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2623                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2624                          buffer_length, smb_len);
2625                 return -EINVAL;
2626         }
2627 
2628         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2629                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2630                 return -EINVAL;
2631         }
2632 
2633         return 0;
2634 }
2635 
2636 /*
2637  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2638  * Caller must free buffer.
2639  */
2640 int
2641 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2642                            struct kvec *iov, unsigned int minbufsize,
2643                            char *data)
2644 {
2645         char *begin_of_buf = offset + (char *)iov->iov_base;
2646         int rc;
2647 
2648         if (!data)
2649                 return -EINVAL;
2650 
2651         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2652         if (rc)
2653                 return rc;
2654 
2655         memcpy(data, begin_of_buf, buffer_length);
2656 
2657         return 0;
2658 }
2659 
2660 int
2661 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2662                      u64 persistent_fid, u64 volatile_fid,
2663                      u8 info_class, u8 info_type, u32 additional_info,
2664                      size_t output_len, size_t input_len, void *input)
2665 {
2666         struct smb2_query_info_req *req;
2667         struct kvec *iov = rqst->rq_iov;
2668         unsigned int total_len;
2669         int rc;
2670 
2671         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2672                              &total_len);
2673         if (rc)
2674                 return rc;
2675 
2676         req->InfoType = info_type;
2677         req->FileInfoClass = info_class;
2678         req->PersistentFileId = persistent_fid;
2679         req->VolatileFileId = volatile_fid;
2680         req->AdditionalInformation = cpu_to_le32(additional_info);
2681 
2682         req->OutputBufferLength = cpu_to_le32(output_len);
2683         if (input_len) {
2684                 req->InputBufferLength = cpu_to_le32(input_len);
2685                 /* total_len for smb query request never close to le16 max */
2686                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2687                 memcpy(req->Buffer, input, input_len);
2688         }
2689 
2690         iov[0].iov_base = (char *)req;
2691         /* 1 for Buffer */
2692         iov[0].iov_len = total_len - 1 + input_len;
2693         return 0;
2694 }
2695 
2696 void
2697 SMB2_query_info_free(struct smb_rqst *rqst)
2698 {
2699         if (rqst && rqst->rq_iov)
2700                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2701 }
2702 
2703 static int
2704 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2705            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2706            u32 additional_info, size_t output_len, size_t min_len, void **data,
2707                 u32 *dlen)
2708 {
2709         struct smb_rqst rqst;
2710         struct smb2_query_info_rsp *rsp = NULL;
2711         struct kvec iov[1];
2712         struct kvec rsp_iov;
2713         int rc = 0;
2714         int resp_buftype = CIFS_NO_BUFFER;
2715         struct cifs_ses *ses = tcon->ses;
2716         int flags = 0;
2717 
2718         cifs_dbg(FYI, "Query Info\n");
2719 
2720         if (!ses || !(ses->server))
2721                 return -EIO;
2722 
2723         if (smb3_encryption_required(tcon))
2724                 flags |= CIFS_TRANSFORM_REQ;
2725 
2726         memset(&rqst, 0, sizeof(struct smb_rqst));
2727         memset(&iov, 0, sizeof(iov));
2728         rqst.rq_iov = iov;
2729         rqst.rq_nvec = 1;
2730 
2731         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2732                                   info_class, info_type, additional_info,
2733                                   output_len, 0, NULL);
2734         if (rc)
2735                 goto qinf_exit;
2736 
2737         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2738         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2739 
2740         if (rc) {
2741                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2742                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2743                                 ses->Suid, info_class, (__u32)info_type, rc);
2744                 goto qinf_exit;
2745         }
2746 
2747         if (dlen) {
2748                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2749                 if (!*data) {
2750                         *data = kmalloc(*dlen, GFP_KERNEL);
2751                         if (!*data) {
2752                                 cifs_dbg(VFS,
2753                                         "Error %d allocating memory for acl\n",
2754                                         rc);
2755                                 *dlen = 0;
2756                                 goto qinf_exit;
2757                         }
2758                 }
2759         }
2760 
2761         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2762                                         le32_to_cpu(rsp->OutputBufferLength),
2763                                         &rsp_iov, min_len, *data);
2764 
2765 qinf_exit:
2766         SMB2_query_info_free(&rqst);
2767         free_rsp_buf(resp_buftype, rsp);
2768         return rc;
2769 }
2770 
2771 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2772                    u64 persistent_fid, u64 volatile_fid,
2773                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2774 {
2775         return query_info(xid, tcon, persistent_fid, volatile_fid,
2776                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2777                           ea_buf_size,
2778                           sizeof(struct smb2_file_full_ea_info),
2779                           (void **)&data,
2780                           NULL);
2781 }
2782 
2783 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2784         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2785 {
2786         return query_info(xid, tcon, persistent_fid, volatile_fid,
2787                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2788                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2789                           sizeof(struct smb2_file_all_info), (void **)&data,
2790                           NULL);
2791 }
2792 
2793 int
2794 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2795                 u64 persistent_fid, u64 volatile_fid,
2796                 void **data, u32 *plen)
2797 {
2798         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2799         *plen = 0;
2800 
2801         return query_info(xid, tcon, persistent_fid, volatile_fid,
2802                           0, SMB2_O_INFO_SECURITY, additional_info,
2803                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2804 }
2805 
2806 int
2807 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2808                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2809 {
2810         return query_info(xid, tcon, persistent_fid, volatile_fid,
2811                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2812                           sizeof(struct smb2_file_internal_info),
2813                           sizeof(struct smb2_file_internal_info),
2814                           (void **)&uniqueid, NULL);
2815 }
2816 
2817 /*
2818  * This is a no-op for now. We're not really interested in the reply, but
2819  * rather in the fact that the server sent one and that server->lstrp
2820  * gets updated.
2821  *
2822  * FIXME: maybe we should consider checking that the reply matches request?
2823  */
2824 static void
2825 smb2_echo_callback(struct mid_q_entry *mid)
2826 {
2827         struct TCP_Server_Info *server = mid->callback_data;
2828         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2829         unsigned int credits_received = 1;
2830 
2831         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2832                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2833 
2834         DeleteMidQEntry(mid);
2835         add_credits(server, credits_received, CIFS_ECHO_OP);
2836 }
2837 
2838 void smb2_reconnect_server(struct work_struct *work)
2839 {
2840         struct TCP_Server_Info *server = container_of(work,
2841                                         struct TCP_Server_Info, reconnect.work);
2842         struct cifs_ses *ses;
2843         struct cifs_tcon *tcon, *tcon2;
2844         struct list_head tmp_list;
2845         int tcon_exist = false;
2846         int rc;
2847         int resched = false;
2848 
2849 
2850         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2851         mutex_lock(&server->reconnect_mutex);
2852 
2853         INIT_LIST_HEAD(&tmp_list);
2854         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2855 
2856         spin_lock(&cifs_tcp_ses_lock);
2857         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2858                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2859                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2860                                 tcon->tc_count++;
2861                                 list_add_tail(&tcon->rlist, &tmp_list);
2862                                 tcon_exist = true;
2863                         }
2864                 }
2865                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2866                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2867                         tcon_exist = true;
2868                 }
2869         }
2870         /*
2871          * Get the reference to server struct to be sure that the last call of
2872          * cifs_put_tcon() in the loop below won't release the server pointer.
2873          */
2874         if (tcon_exist)
2875                 server->srv_count++;
2876 
2877         spin_unlock(&cifs_tcp_ses_lock);
2878 
2879         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2880                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2881                 if (!rc)
2882                         cifs_reopen_persistent_handles(tcon);
2883                 else
2884                         resched = true;
2885                 list_del_init(&tcon->rlist);
2886                 cifs_put_tcon(tcon);
2887         }
2888 
2889         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2890         if (resched)
2891                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2892         mutex_unlock(&server->reconnect_mutex);
2893 
2894         /* now we can safely release srv struct */
2895         if (tcon_exist)
2896                 cifs_put_tcp_session(server, 1);
2897 }
2898 
2899 int
2900 SMB2_echo(struct TCP_Server_Info *server)
2901 {
2902         struct smb2_echo_req *req;
2903         int rc = 0;
2904         struct kvec iov[1];
2905         struct smb_rqst rqst = { .rq_iov = iov,
2906                                  .rq_nvec = 1 };
2907         unsigned int total_len;
2908 
2909         cifs_dbg(FYI, "In echo request\n");
2910 
2911         if (server->tcpStatus == CifsNeedNegotiate) {
2912                 /* No need to send echo on newly established connections */
2913                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2914                 return rc;
2915         }
2916 
2917         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2918         if (rc)
2919                 return rc;
2920 
2921         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2922 
2923         iov[0].iov_len = total_len;
2924         iov[0].iov_base = (char *)req;
2925 
2926         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2927                              server, CIFS_ECHO_OP);
2928         if (rc)
2929                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2930 
2931         cifs_small_buf_release(req);
2932         return rc;
2933 }
2934 
2935 int
2936 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2937            u64 volatile_fid)
2938 {
2939         struct smb_rqst rqst;
2940         struct smb2_flush_req *req;
2941         struct cifs_ses *ses = tcon->ses;
2942         struct kvec iov[1];
2943         struct kvec rsp_iov;
2944         int resp_buftype;
2945         int rc = 0;
2946         int flags = 0;
2947         unsigned int total_len;
2948 
2949         cifs_dbg(FYI, "Flush\n");
2950 
2951         if (!ses || !(ses->server))
2952                 return -EIO;
2953 
2954         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2955         if (rc)
2956                 return rc;
2957 
2958         if (smb3_encryption_required(tcon))
2959                 flags |= CIFS_TRANSFORM_REQ;
2960 
2961         req->PersistentFileId = persistent_fid;
2962         req->VolatileFileId = volatile_fid;
2963 
2964         iov[0].iov_base = (char *)req;
2965         iov[0].iov_len = total_len;
2966 
2967         memset(&rqst, 0, sizeof(struct smb_rqst));
2968         rqst.rq_iov = iov;
2969         rqst.rq_nvec = 1;
2970 
2971         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2972         cifs_small_buf_release(req);
2973 
2974         if (rc != 0) {
2975                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2976                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2977                                      rc);
2978         }
2979 
2980         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2981         return rc;
2982 }
2983 
2984 /*
2985  * To form a chain of read requests, any read requests after the first should
2986  * have the end_of_chain boolean set to true.
2987  */
2988 static int
2989 smb2_new_read_req(void **buf, unsigned int *total_len,
2990         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2991         unsigned int remaining_bytes, int request_type)
2992 {
2993         int rc = -EACCES;
2994         struct smb2_read_plain_req *req = NULL;
2995         struct smb2_sync_hdr *shdr;
2996         struct TCP_Server_Info *server;
2997 
2998         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2999                                  total_len);
3000         if (rc)
3001                 return rc;
3002 
3003         server = io_parms->tcon->ses->server;
3004         if (server == NULL)
3005                 return -ECONNABORTED;
3006 
3007         shdr = &req->sync_hdr;
3008         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3009 
3010         req->PersistentFileId = io_parms->persistent_fid;
3011         req->VolatileFileId = io_parms->volatile_fid;
3012         req->ReadChannelInfoOffset = 0; /* reserved */
3013         req->ReadChannelInfoLength = 0; /* reserved */
3014         req->Channel = 0; /* reserved */
3015         req->MinimumCount = 0;
3016         req->Length = cpu_to_le32(io_parms->length);
3017         req->Offset = cpu_to_le64(io_parms->offset);
3018 #ifdef CONFIG_CIFS_SMB_DIRECT
3019         /*
3020          * If we want to do a RDMA write, fill in and append
3021          * smbd_buffer_descriptor_v1 to the end of read request
3022          */
3023         if (server->rdma && rdata && !server->sign &&
3024                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3025 
3026                 struct smbd_buffer_descriptor_v1 *v1;
3027                 bool need_invalidate =
3028                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3029 
3030                 rdata->mr = smbd_register_mr(
3031                                 server->smbd_conn, rdata->pages,
3032                                 rdata->nr_pages, rdata->page_offset,
3033                                 rdata->tailsz, true, need_invalidate);
3034                 if (!rdata->mr)
3035                         return -ENOBUFS;
3036 
3037                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3038                 if (need_invalidate)
3039                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3040                 req->ReadChannelInfoOffset =
3041                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3042                 req->ReadChannelInfoLength =
3043                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3044                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3045                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3046                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3047                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3048 
3049                 *total_len += sizeof(*v1) - 1;
3050         }
3051 #endif
3052         if (request_type & CHAINED_REQUEST) {
3053                 if (!(request_type & END_OF_CHAIN)) {
3054                         /* next 8-byte aligned request */
3055                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3056                         shdr->NextCommand = cpu_to_le32(*total_len);
3057                 } else /* END_OF_CHAIN */
3058                         shdr->NextCommand = 0;
3059                 if (request_type & RELATED_REQUEST) {
3060                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3061                         /*
3062                          * Related requests use info from previous read request
3063                          * in chain.
3064                          */
3065                         shdr->SessionId = 0xFFFFFFFF;
3066                         shdr->TreeId = 0xFFFFFFFF;
3067                         req->PersistentFileId = 0xFFFFFFFF;
3068                         req->VolatileFileId = 0xFFFFFFFF;
3069                 }
3070         }
3071         if (remaining_bytes > io_parms->length)
3072                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3073         else
3074                 req->RemainingBytes = 0;
3075 
3076         *buf = req;
3077         return rc;
3078 }
3079 
3080 static void
3081 smb2_readv_callback(struct mid_q_entry *mid)
3082 {
3083         struct cifs_readdata *rdata = mid->callback_data;
3084         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3085         struct TCP_Server_Info *server = tcon->ses->server;
3086         struct smb2_sync_hdr *shdr =
3087                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3088         unsigned int credits_received = 1;
3089         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3090                                  .rq_nvec = 2,
3091                                  .rq_pages = rdata->pages,
3092                                  .rq_offset = rdata->page_offset,
3093                                  .rq_npages = rdata->nr_pages,
3094                                  .rq_pagesz = rdata->pagesz,
3095                                  .rq_tailsz = rdata->tailsz };
3096 
3097         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3098                  __func__, mid->mid, mid->mid_state, rdata->result,
3099                  rdata->bytes);
3100 
3101         switch (mid->mid_state) {
3102         case MID_RESPONSE_RECEIVED:
3103                 credits_received = le16_to_cpu(shdr->CreditRequest);
3104                 /* result already set, check signature */
3105                 if (server->sign && !mid->decrypted) {
3106                         int rc;
3107 
3108                         rc = smb2_verify_signature(&rqst, server);
3109                         if (rc)
3110                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3111                                          rc);
3112                 }
3113                 /* FIXME: should this be counted toward the initiating task? */
3114                 task_io_account_read(rdata->got_bytes);
3115                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3116                 break;
3117         case MID_REQUEST_SUBMITTED:
3118         case MID_RETRY_NEEDED:
3119                 rdata->result = -EAGAIN;
3120                 if (server->sign && rdata->got_bytes)
3121                         /* reset bytes number since we can not check a sign */
3122                         rdata->got_bytes = 0;
3123                 /* FIXME: should this be counted toward the initiating task? */
3124                 task_io_account_read(rdata->got_bytes);
3125                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3126                 break;
3127         default:
3128                 if (rdata->result != -ENODATA)
3129                         rdata->result = -EIO;
3130         }
3131 #ifdef CONFIG_CIFS_SMB_DIRECT
3132         /*
3133          * If this rdata has a memmory registered, the MR can be freed
3134          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3135          * because they have limited number and are used for future I/Os
3136          */
3137         if (rdata->mr) {
3138                 smbd_deregister_mr(rdata->mr);
3139                 rdata->mr = NULL;
3140         }
3141 #endif
3142         if (rdata->result)
3143                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3144 
3145         queue_work(cifsiod_wq, &rdata->work);
3146         DeleteMidQEntry(mid);
3147         add_credits(server, credits_received, 0);
3148 }
3149 
3150 /* smb2_async_readv - send an async read, and set up mid to handle result */
3151 int
3152 smb2_async_readv(struct cifs_readdata *rdata)
3153 {
3154         int rc, flags = 0;
3155         char *buf;
3156         struct smb2_sync_hdr *shdr;
3157         struct cifs_io_parms io_parms;
3158         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3159                                  .rq_nvec = 1 };
3160         struct TCP_Server_Info *server;
3161         unsigned int total_len;
3162 
3163         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3164                  __func__, rdata->offset, rdata->bytes);
3165 
3166         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3167         io_parms.offset = rdata->offset;
3168         io_parms.length = rdata->bytes;
3169         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3170         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3171         io_parms.pid = rdata->pid;
3172 
3173         server = io_parms.tcon->ses->server;
3174 
3175         rc = smb2_new_read_req(
3176                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3177         if (rc) {
3178                 if (rc == -EAGAIN && rdata->credits) {
3179                         /* credits was reset by reconnect */
3180                         rdata->credits = 0;
3181                         /* reduce in_flight value since we won't send the req */
3182                         spin_lock(&server->req_lock);
3183                         server->in_flight--;
3184                         spin_unlock(&server->req_lock);
3185                 }
3186                 return rc;
3187         }
3188 
3189         if (smb3_encryption_required(io_parms.tcon))
3190                 flags |= CIFS_TRANSFORM_REQ;
3191 
3192         rdata->iov[0].iov_base = buf;
3193         rdata->iov[0].iov_len = total_len;
3194 
3195         shdr = (struct smb2_sync_hdr *)buf;
3196 
3197         if (rdata->credits) {
3198                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3199                                                 SMB2_MAX_BUFFER_SIZE));
3200                 shdr->CreditRequest = shdr->CreditCharge;
3201                 spin_lock(&server->req_lock);
3202                 server->credits += rdata->credits -
3203                                                 le16_to_cpu(shdr->CreditCharge);
3204                 spin_unlock(&server->req_lock);
3205                 wake_up(&server->request_q);
3206                 flags |= CIFS_HAS_CREDITS;
3207         }
3208 
3209         kref_get(&rdata->refcount);
3210         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3211                              cifs_readv_receive, smb2_readv_callback,
3212                              smb3_handle_read_data, rdata, flags);
3213         if (rc) {
3214                 kref_put(&rdata->refcount, cifs_readdata_release);
3215                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3216                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3217                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3218                                    io_parms.offset, io_parms.length);
3219         } else
3220                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3221                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3222                                    io_parms.offset, io_parms.length);
3223 
3224         cifs_small_buf_release(buf);
3225         return rc;
3226 }
3227 
3228 int
3229 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3230           unsigned int *nbytes, char **buf, int *buf_type)
3231 {
3232         struct smb_rqst rqst;
3233         int resp_buftype, rc = -EACCES;
3234         struct smb2_read_plain_req *req = NULL;
3235         struct smb2_read_rsp *rsp = NULL;
3236         struct kvec iov[1];
3237         struct kvec rsp_iov;
3238         unsigned int total_len;
3239         int flags = CIFS_LOG_ERROR;
3240         struct cifs_ses *ses = io_parms->tcon->ses;
3241 
3242         *nbytes = 0;
3243         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3244         if (rc)
3245                 return rc;
3246 
3247         if (smb3_encryption_required(io_parms->tcon))
3248                 flags |= CIFS_TRANSFORM_REQ;
3249 
3250         iov[0].iov_base = (char *)req;
3251         iov[0].iov_len = total_len;
3252 
3253         memset(&rqst, 0, sizeof(struct smb_rqst));
3254         rqst.rq_iov = iov;
3255         rqst.rq_nvec = 1;
3256 
3257         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3258         cifs_small_buf_release(req);
3259 
3260         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3261 
3262         if (rc) {
3263                 if (rc != -ENODATA) {
3264                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3265                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3266                 }
3267                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3268                                     io_parms->tcon->tid, ses->Suid,
3269                                     io_parms->offset, io_parms->length);
3270                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3271                 return rc == -ENODATA ? 0 : rc;
3272         } else
3273                 trace_smb3_read_done(xid, req->PersistentFileId,
3274                                     io_parms->tcon->tid, ses->Suid,
3275                                     io_parms->offset, io_parms->length);
3276 
3277         *nbytes = le32_to_cpu(rsp->DataLength);
3278         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3279             (*nbytes > io_parms->length)) {
3280                 cifs_dbg(FYI, "bad length %d for count %d\n",
3281                          *nbytes, io_parms->length);
3282                 rc = -EIO;
3283                 *nbytes = 0;
3284         }
3285 
3286         if (*buf) {
3287                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3288                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3289         } else if (resp_buftype != CIFS_NO_BUFFER) {
3290                 *buf = rsp_iov.iov_base;
3291                 if (resp_buftype == CIFS_SMALL_BUFFER)
3292                         *buf_type = CIFS_SMALL_BUFFER;
3293                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3294                         *buf_type = CIFS_LARGE_BUFFER;
3295         }
3296         return rc;
3297 }
3298 
3299 /*
3300  * Check the mid_state and signature on received buffer (if any), and queue the
3301  * workqueue completion task.
3302  */
3303 static void
3304 smb2_writev_callback(struct mid_q_entry *mid)
3305 {
3306         struct cifs_writedata *wdata = mid->callback_data;
3307         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3308         unsigned int written;
3309         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3310         unsigned int credits_received = 1;
3311 
3312         switch (mid->mid_state) {
3313         case MID_RESPONSE_RECEIVED:
3314                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3315                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3316                 if (wdata->result != 0)
3317                         break;
3318 
3319                 written = le32_to_cpu(rsp->DataLength);
3320                 /*
3321                  * Mask off high 16 bits when bytes written as returned
3322                  * by the server is greater than bytes requested by the
3323                  * client. OS/2 servers are known to set incorrect
3324                  * CountHigh values.
3325                  */
3326                 if (written > wdata->bytes)
3327                         written &= 0xFFFF;
3328 
3329                 if (written < wdata->bytes)
3330                         wdata->result = -ENOSPC;
3331                 else
3332                         wdata->bytes = written;
3333                 break;
3334         case MID_REQUEST_SUBMITTED:
3335         case MID_RETRY_NEEDED:
3336                 wdata->result = -EAGAIN;
3337                 break;
3338         default:
3339                 wdata->result = -EIO;
3340                 break;
3341         }
3342 #ifdef CONFIG_CIFS_SMB_DIRECT
3343         /*
3344          * If this wdata has a memory registered, the MR can be freed
3345          * The number of MRs available is limited, it's important to recover
3346          * used MR as soon as I/O is finished. Hold MR longer in the later
3347          * I/O process can possibly result in I/O deadlock due to lack of MR
3348          * to send request on I/O retry
3349          */
3350         if (wdata->mr) {
3351                 smbd_deregister_mr(wdata->mr);
3352                 wdata->mr = NULL;
3353         }
3354 #endif
3355         if (wdata->result)
3356                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3357 
3358         queue_work(cifsiod_wq, &wdata->work);
3359         DeleteMidQEntry(mid);
3360         add_credits(tcon->ses->server, credits_received, 0);
3361 }
3362 
3363 /* smb2_async_writev - send an async write, and set up mid to handle result */
3364 int
3365 smb2_async_writev(struct cifs_writedata *wdata,
3366                   void (*release)(struct kref *kref))
3367 {
3368         int rc = -EACCES, flags = 0;
3369         struct smb2_write_req *req = NULL;
3370         struct smb2_sync_hdr *shdr;
3371         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3372         struct TCP_Server_Info *server = tcon->ses->server;
3373         struct kvec iov[1];
3374         struct smb_rqst rqst = { };
3375         unsigned int total_len;
3376 
3377         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3378         if (rc) {
3379                 if (rc == -EAGAIN && wdata->credits) {
3380                         /* credits was reset by reconnect */
3381                         wdata->credits = 0;
3382                         /* reduce in_flight value since we won't send the req */
3383                         spin_lock(&server->req_lock);
3384                         server->in_flight--;
3385                         spin_unlock(&server->req_lock);
3386                 }
3387                 goto async_writev_out;
3388         }
3389 
3390         if (smb3_encryption_required(tcon))
3391                 flags |= CIFS_TRANSFORM_REQ;
3392 
3393         shdr = (struct smb2_sync_hdr *)req;
3394         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3395 
3396         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3397         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3398         req->WriteChannelInfoOffset = 0;
3399         req->WriteChannelInfoLength = 0;
3400         req->Channel = 0;
3401         req->Offset = cpu_to_le64(wdata->offset);
3402         req->DataOffset = cpu_to_le16(
3403                                 offsetof(struct smb2_write_req, Buffer));
3404         req->RemainingBytes = 0;
3405 #ifdef CONFIG_CIFS_SMB_DIRECT
3406         /*
3407          * If we want to do a server RDMA read, fill in and append
3408          * smbd_buffer_descriptor_v1 to the end of write request
3409          */
3410         if (server->rdma && !server->sign && wdata->bytes >=
3411                 server->smbd_conn->rdma_readwrite_threshold) {
3412 
3413                 struct smbd_buffer_descriptor_v1 *v1;
3414                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3415 
3416                 wdata->mr = smbd_register_mr(
3417                                 server->smbd_conn, wdata->pages,
3418                                 wdata->nr_pages, wdata->page_offset,
3419                                 wdata->tailsz, false, need_invalidate);
3420                 if (!wdata->mr) {
3421                         rc = -ENOBUFS;
3422                         goto async_writev_out;
3423                 }
3424                 req->Length = 0;
3425                 req->DataOffset = 0;
3426                 if (wdata->nr_pages > 1)
3427                         req->RemainingBytes =
3428                                 cpu_to_le32(
3429                                         (wdata->nr_pages - 1) * wdata->pagesz -
3430                                         wdata->page_offset + wdata->tailsz
3431                                 );
3432                 else
3433                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3434                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3435                 if (need_invalidate)
3436                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3437                 req->WriteChannelInfoOffset =
3438                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3439                 req->WriteChannelInfoLength =
3440                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3441                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3442                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3443                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3444                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3445         }
3446 #endif
3447         iov[0].iov_len = total_len - 1;
3448         iov[0].iov_base = (char *)req;
3449 
3450         rqst.rq_iov = iov;
3451         rqst.rq_nvec = 1;
3452         rqst.rq_pages = wdata->pages;
3453         rqst.rq_offset = wdata->page_offset;
3454         rqst.rq_npages = wdata->nr_pages;
3455         rqst.rq_pagesz = wdata->pagesz;
3456         rqst.rq_tailsz = wdata->tailsz;
3457 #ifdef CONFIG_CIFS_SMB_DIRECT
3458         if (wdata->mr) {
3459                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3460                 rqst.rq_npages = 0;
3461         }
3462 #endif
3463         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3464                  wdata->offset, wdata->bytes);
3465 
3466 #ifdef CONFIG_CIFS_SMB_DIRECT
3467         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3468         if (!wdata->mr)
3469                 req->Length = cpu_to_le32(wdata->bytes);
3470 #else
3471         req->Length = cpu_to_le32(wdata->bytes);
3472 #endif
3473 
3474         if (wdata->credits) {
3475                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3476                                                     SMB2_MAX_BUFFER_SIZE));
3477                 shdr->CreditRequest = shdr->CreditCharge;
3478                 spin_lock(&server->req_lock);
3479                 server->credits += wdata->credits -
3480                                                 le16_to_cpu(shdr->CreditCharge);
3481                 spin_unlock(&server->req_lock);
3482                 wake_up(&server->request_q);
3483                 flags |= CIFS_HAS_CREDITS;
3484         }
3485 
3486         kref_get(&wdata->refcount);
3487         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3488                              wdata, flags);
3489 
3490         if (rc) {
3491                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3492                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3493                                      wdata->bytes, rc);
3494                 kref_put(&wdata->refcount, release);
3495                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3496         } else
3497                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3498                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3499                                      wdata->bytes);
3500 
3501 async_writev_out:
3502         cifs_small_buf_release(req);
3503         return rc;
3504 }
3505 
3506 /*
3507  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3508  * The length field from io_parms must be at least 1 and indicates a number of
3509  * elements with data to write that begins with position 1 in iov array. All
3510  * data length is specified by count.
3511  */
3512 int
3513 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3514            unsigned int *nbytes, struct kvec *iov, int n_vec)
3515 {
3516         struct smb_rqst rqst;
3517         int rc = 0;
3518         struct smb2_write_req *req = NULL;
3519         struct smb2_write_rsp *rsp = NULL;
3520         int resp_buftype;
3521         struct kvec rsp_iov;
3522         int flags = 0;
3523         unsigned int total_len;
3524 
3525         *nbytes = 0;
3526 
3527         if (n_vec < 1)
3528                 return rc;
3529 
3530         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3531                              &total_len);
3532         if (rc)
3533                 return rc;
3534 
3535         if (io_parms->tcon->ses->server == NULL)
3536                 return -ECONNABORTED;
3537 
3538         if (smb3_encryption_required(io_parms->tcon))
3539                 flags |= CIFS_TRANSFORM_REQ;
3540 
3541         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3542 
3543         req->PersistentFileId = io_parms->persistent_fid;
3544         req->VolatileFileId = io_parms->volatile_fid;
3545         req->WriteChannelInfoOffset = 0;
3546         req->WriteChannelInfoLength = 0;
3547         req->Channel = 0;
3548         req->Length = cpu_to_le32(io_parms->length);
3549         req->Offset = cpu_to_le64(io_parms->offset);
3550         req->DataOffset = cpu_to_le16(
3551                                 offsetof(struct smb2_write_req, Buffer));
3552         req->RemainingBytes = 0;
3553 
3554         iov[0].iov_base = (char *)req;
3555         /* 1 for Buffer */
3556         iov[0].iov_len = total_len - 1;
3557 
3558         memset(&rqst, 0, sizeof(struct smb_rqst));
3559         rqst.rq_iov = iov;
3560         rqst.rq_nvec = n_vec + 1;
3561 
3562         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3563                             &resp_buftype, flags, &rsp_iov);
3564         cifs_small_buf_release(req);
3565         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3566 
3567         if (rc) {
3568                 trace_smb3_write_err(xid, req->PersistentFileId,
3569                                      io_parms->tcon->tid,
3570                                      io_parms->tcon->ses->Suid,
3571                                      io_parms->offset, io_parms->length, rc);
3572                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3573                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3574         } else {
3575                 *nbytes = le32_to_cpu(rsp->DataLength);
3576                 trace_smb3_write_done(xid, req->PersistentFileId,
3577                                      io_parms->tcon->tid,
3578                                      io_parms->tcon->ses->Suid,
3579                                      io_parms->offset, *nbytes);
3580         }
3581 
3582         free_rsp_buf(resp_buftype, rsp);
3583         return rc;
3584 }
3585 
3586 static unsigned int
3587 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3588 {
3589         int len;
3590         unsigned int entrycount = 0;
3591         unsigned int next_offset = 0;
3592         char *entryptr;
3593         FILE_DIRECTORY_INFO *dir_info;
3594 
3595         if (bufstart == NULL)
3596                 return 0;
3597 
3598         entryptr = bufstart;
3599 
3600         while (1) {
3601                 if (entryptr + next_offset < entryptr ||
3602                     entryptr + next_offset > end_of_buf ||
3603                     entryptr + next_offset + size > end_of_buf) {
3604                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3605                         break;
3606                 }
3607 
3608                 entryptr = entryptr + next_offset;
3609                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3610 
3611                 len = le32_to_cpu(dir_info->FileNameLength);
3612                 if (entryptr + len < entryptr ||
3613                     entryptr + len > end_of_buf ||
3614                     entryptr + len + size > end_of_buf) {
3615                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3616                                  end_of_buf);
3617                         break;
3618                 }
3619 
3620                 *lastentry = entryptr;
3621                 entrycount++;
3622 
3623                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3624                 if (!next_offset)
3625                         break;
3626         }
3627 
3628         return entrycount;
3629 }
3630 
3631 /*
3632  * Readdir/FindFirst
3633  */
3634 int
3635 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3636                      u64 persistent_fid, u64 volatile_fid, int index,
3637                      struct cifs_search_info *srch_inf)
3638 {
3639         struct smb_rqst rqst;
3640         struct smb2_query_directory_req *req;
3641         struct smb2_query_directory_rsp *rsp = NULL;
3642         struct kvec iov[2];
3643         struct kvec rsp_iov;
3644         int rc = 0;
3645         int len;
3646         int resp_buftype = CIFS_NO_BUFFER;
3647         unsigned char *bufptr;
3648         struct TCP_Server_Info *server;
3649         struct cifs_ses *ses = tcon->ses;
3650         __le16 asteriks = cpu_to_le16('*');
3651         char *end_of_smb;
3652         unsigned int output_size = CIFSMaxBufSize;
3653         size_t info_buf_size;
3654         int flags = 0;
3655         unsigned int total_len;
3656 
3657         if (ses && (ses->server))
3658                 server = ses->server;
3659         else
3660                 return -EIO;
3661 
3662         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3663                              &total_len);
3664         if (rc)
3665                 return rc;
3666 
3667         if (smb3_encryption_required(tcon))
3668                 flags |= CIFS_TRANSFORM_REQ;
3669 
3670         switch (srch_inf->info_level) {
3671         case SMB_FIND_FILE_DIRECTORY_INFO:
3672                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3673                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3674                 break;
3675         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3676                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3677                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3678                 break;
3679         default:
3680                 cifs_dbg(VFS, "info level %u isn't supported\n",
3681                          srch_inf->info_level);
3682                 rc = -EINVAL;
3683                 goto qdir_exit;
3684         }
3685 
3686         req->FileIndex = cpu_to_le32(index);
3687         req->PersistentFileId = persistent_fid;
3688         req->VolatileFileId = volatile_fid;
3689 
3690         len = 0x2;
3691         bufptr = req->Buffer;
3692         memcpy(bufptr, &asteriks, len);
3693 
3694         req->FileNameOffset =
3695                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3696         req->FileNameLength = cpu_to_le16(len);
3697         /*
3698          * BB could be 30 bytes or so longer if we used SMB2 specific
3699          * buffer lengths, but this is safe and close enough.
3700          */
3701         output_size = min_t(unsigned int, output_size, server->maxBuf);
3702         output_size = min_t(unsigned int, output_size, 2 << 15);
3703         req->OutputBufferLength = cpu_to_le32(output_size);
3704 
3705         iov[0].iov_base = (char *)req;
3706         /* 1 for Buffer */
3707         iov[0].iov_len = total_len - 1;
3708 
3709         iov[1].iov_base = (char *)(req->Buffer);
3710         iov[1].iov_len = len;
3711 
3712         memset(&rqst, 0, sizeof(struct smb_rqst));
3713         rqst.rq_iov = iov;
3714         rqst.rq_nvec = 2;
3715 
3716         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3717         cifs_small_buf_release(req);
3718         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3719 
3720         if (rc) {
3721                 if (rc == -ENODATA &&
3722                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3723                         srch_inf->endOfSearch = true;
3724                         rc = 0;
3725                 }
3726                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3727                 goto qdir_exit;
3728         }
3729 
3730         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3731                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3732                                info_buf_size);
3733         if (rc)
3734                 goto qdir_exit;
3735 
3736         srch_inf->unicode = true;
3737 
3738         if (srch_inf->ntwrk_buf_start) {
3739                 if (srch_inf->smallBuf)
3740                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3741                 else
3742                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3743         }
3744         srch_inf->ntwrk_buf_start = (char *)rsp;
3745         srch_inf->srch_entries_start = srch_inf->last_entry =
3746                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3747         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3748         srch_inf->entries_in_buffer =
3749                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3750                                     &srch_inf->last_entry, info_buf_size);
3751         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3752         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3753                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3754                  srch_inf->srch_entries_start, srch_inf->last_entry);
3755         if (resp_buftype == CIFS_LARGE_BUFFER)
3756                 srch_inf->smallBuf = false;
3757         else if (resp_buftype == CIFS_SMALL_BUFFER)
3758                 srch_inf->smallBuf = true;
3759         else
3760                 cifs_dbg(VFS, "illegal search buffer type\n");
3761 
3762         return rc;
3763 
3764 qdir_exit:
3765         free_rsp_buf(resp_buftype, rsp);
3766         return rc;
3767 }
3768 
3769 int
3770 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3771                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3772                u8 info_type, u32 additional_info,
3773                 void **data, unsigned int *size)
3774 {
3775         struct smb2_set_info_req *req;
3776         struct kvec *iov = rqst->rq_iov;
3777         unsigned int i, total_len;
3778         int rc;
3779 
3780         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3781         if (rc)
3782                 return rc;
3783 
3784         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3785         req->InfoType = info_type;
3786         req->FileInfoClass = info_class;
3787         req->PersistentFileId = persistent_fid;
3788         req->VolatileFileId = volatile_fid;
3789         req->AdditionalInformation = cpu_to_le32(additional_info);
3790 
3791         req->BufferOffset =
3792                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3793         req->BufferLength = cpu_to_le32(*size);
3794 
3795         memcpy(req->Buffer, *data, *size);
3796         total_len += *size;
3797 
3798         iov[0].iov_base = (char *)req;
3799         /* 1 for Buffer */
3800         iov[0].iov_len = total_len - 1;
3801 
3802         for (i = 1; i < rqst->rq_nvec; i++) {
3803                 le32_add_cpu(&req->BufferLength, size[i]);
3804                 iov[i].iov_base = (char *)data[i];
3805                 iov[i].iov_len = size[i];
3806         }
3807 
3808         return 0;
3809 }
3810 
3811 void
3812 SMB2_set_info_free(struct smb_rqst *rqst)
3813 {
3814         if (rqst && rqst->rq_iov)
3815                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3816 }
3817 
3818 static int
3819 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3820                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3821                u8 info_type, u32 additional_info, unsigned int num,
3822                 void **data, unsigned int *size)
3823 {
3824         struct smb_rqst rqst;
3825         struct smb2_set_info_rsp *rsp = NULL;
3826         struct kvec *iov;
3827         struct kvec rsp_iov;
3828         int rc = 0;
3829         int resp_buftype;
3830         struct cifs_ses *ses = tcon->ses;
3831         int flags = 0;
3832 
3833         if (!ses || !(ses->server))
3834                 return -EIO;
3835 
3836         if (!num)
3837                 return -EINVAL;
3838 
3839         if (smb3_encryption_required(tcon))
3840                 flags |= CIFS_TRANSFORM_REQ;
3841 
3842         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3843         if (!iov)
3844                 return -ENOMEM;
3845 
3846         memset(&rqst, 0, sizeof(struct smb_rqst));
3847         rqst.rq_iov = iov;
3848         rqst.rq_nvec = num;
3849 
3850         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3851                                 info_class, info_type, additional_info,
3852                                 data, size);
3853         if (rc) {
3854                 kfree(iov);
3855                 return rc;
3856         }
3857 
3858 
3859         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3860                             &rsp_iov);
3861         SMB2_set_info_free(&rqst);
3862         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3863 
3864         if (rc != 0) {
3865                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3866                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3867                                 ses->Suid, info_class, (__u32)info_type, rc);
3868         }
3869 
3870         free_rsp_buf(resp_buftype, rsp);
3871         kfree(iov);
3872         return rc;
3873 }
3874 
3875 int
3876 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3877              u64 volatile_fid, u32 pid, __le64 *eof)
3878 {
3879         struct smb2_file_eof_info info;
3880         void *data;
3881         unsigned int size;
3882 
3883         info.EndOfFile = *eof;
3884 
3885         data = &info;
3886         size = sizeof(struct smb2_file_eof_info);
3887 
3888         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3889                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3890                         0, 1, &data, &size);
3891 }
3892 
3893 int
3894 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3895                 u64 persistent_fid, u64 volatile_fid,
3896                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3897 {
3898         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3899                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3900                         1, (void **)&pnntsd, &pacllen);
3901 }
3902 
3903 int
3904 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3905             u64 persistent_fid, u64 volatile_fid,
3906             struct smb2_file_full_ea_info *buf, int len)
3907 {
3908         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3909                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3910                 0, 1, (void **)&buf, &len);
3911 }
3912 
3913 int
3914 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3915                   const u64 persistent_fid, const u64 volatile_fid,
3916                   __u8 oplock_level)
3917 {
3918         struct smb_rqst rqst;
3919         int rc;
3920         struct smb2_oplock_break *req = NULL;
3921         struct cifs_ses *ses = tcon->ses;
3922         int flags = CIFS_OBREAK_OP;
3923         unsigned int total_len;
3924         struct kvec iov[1];
3925         struct kvec rsp_iov;
3926         int resp_buf_type;
3927 
3928         cifs_dbg(FYI, "SMB2_oplock_break\n");
3929         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3930                              &total_len);
3931         if (rc)
3932                 return rc;
3933 
3934         if (smb3_encryption_required(tcon))
3935                 flags |= CIFS_TRANSFORM_REQ;
3936 
3937         req->VolatileFid = volatile_fid;
3938         req->PersistentFid = persistent_fid;
3939         req->OplockLevel = oplock_level;
3940         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3941 
3942         flags |= CIFS_NO_RESP;
3943 
3944         iov[0].iov_base = (char *)req;
3945         iov[0].iov_len = total_len;
3946 
3947         memset(&rqst, 0, sizeof(struct smb_rqst));
3948         rqst.rq_iov = iov;
3949         rqst.rq_nvec = 1;
3950 
3951         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3952         cifs_small_buf_release(req);
3953 
3954         if (rc) {
3955                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3956                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3957         }
3958 
3959         return rc;
3960 }
3961 
3962 void
3963 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3964                              struct kstatfs *kst)
3965 {
3966         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3967                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3968         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3969         kst->f_bfree  = kst->f_bavail =
3970                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3971         return;
3972 }
3973 
3974 static void
3975 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
3976                         struct kstatfs *kst)
3977 {
3978         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
3979         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
3980         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
3981         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
3982                 kst->f_bavail = kst->f_bfree;
3983         else
3984                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
3985         if (response_data->TotalFileNodes != cpu_to_le64(-1))
3986                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
3987         if (response_data->FreeFileNodes != cpu_to_le64(-1))
3988                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
3989 
3990         return;
3991 }
3992 
3993 static int
3994 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3995                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3996 {
3997         struct TCP_Server_Info *server;
3998         int rc;
3999         struct smb2_query_info_req *req;
4000         unsigned int total_len;
4001 
4002         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4003 
4004         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4005                 return -EIO;
4006 
4007         server = tcon->ses->server;
4008 
4009         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4010                              &total_len);
4011         if (rc)
4012                 return rc;
4013 
4014         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4015         req->FileInfoClass = level;
4016         req->PersistentFileId = persistent_fid;
4017         req->VolatileFileId = volatile_fid;
4018         /* 1 for pad */
4019         req->InputBufferOffset =
4020                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4021         req->OutputBufferLength = cpu_to_le32(
4022                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4023 
4024         iov->iov_base = (char *)req;
4025         iov->iov_len = total_len;
4026         return 0;
4027 }
4028 
4029 int
4030 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4031               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4032 {
4033         struct smb_rqst rqst;
4034         struct smb2_query_info_rsp *rsp = NULL;
4035         struct kvec iov;
4036         struct kvec rsp_iov;
4037         int rc = 0;
4038         int resp_buftype;
4039         struct cifs_ses *ses = tcon->ses;
4040         FILE_SYSTEM_POSIX_INFO *info = NULL;
4041         int flags = 0;
4042 
4043         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4044                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4045                                 persistent_fid, volatile_fid);
4046         if (rc)
4047                 return rc;
4048 
4049         if (smb3_encryption_required(tcon))
4050                 flags |= CIFS_TRANSFORM_REQ;
4051 
4052         memset(&rqst, 0, sizeof(struct smb_rqst));
4053         rqst.rq_iov = &iov;
4054         rqst.rq_nvec = 1;
4055 
4056         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4057         cifs_small_buf_release(iov.iov_base);
4058         if (rc) {
4059                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4060                 goto posix_qfsinf_exit;
4061         }
4062         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4063 
4064         info = (FILE_SYSTEM_POSIX_INFO *)(
4065                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4066         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4067                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4068                                sizeof(FILE_SYSTEM_POSIX_INFO));
4069         if (!rc)
4070                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4071 
4072 posix_qfsinf_exit:
4073         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4074         return rc;
4075 }
4076 
4077 int
4078 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4079               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4080 {
4081         struct smb_rqst rqst;
4082         struct smb2_query_info_rsp *rsp = NULL;
4083         struct kvec iov;
4084         struct kvec rsp_iov;
4085         int rc = 0;
4086         int resp_buftype;
4087         struct cifs_ses *ses = tcon->ses;
4088         struct smb2_fs_full_size_info *info = NULL;
4089         int flags = 0;
4090 
4091         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4092                                 sizeof(struct smb2_fs_full_size_info),
4093                                 persistent_fid, volatile_fid);
4094         if (rc)
4095                 return rc;
4096 
4097         if (smb3_encryption_required(tcon))
4098                 flags |= CIFS_TRANSFORM_REQ;
4099 
4100         memset(&rqst, 0, sizeof(struct smb_rqst));
4101         rqst.rq_iov = &iov;
4102         rqst.rq_nvec = 1;
4103 
4104         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4105         cifs_small_buf_release(iov.iov_base);
4106         if (rc) {
4107                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4108                 goto qfsinf_exit;
4109         }
4110         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4111 
4112         info = (struct smb2_fs_full_size_info *)(
4113                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4114         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4115                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4116                                sizeof(struct smb2_fs_full_size_info));
4117         if (!rc)
4118                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4119 
4120 qfsinf_exit:
4121         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4122         return rc;
4123 }
4124 
4125 int
4126 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4127               u64 persistent_fid, u64 volatile_fid, int level)
4128 {
4129         struct smb_rqst rqst;
4130         struct smb2_query_info_rsp *rsp = NULL;
4131         struct kvec iov;
4132         struct kvec rsp_iov;
4133         int rc = 0;
4134         int resp_buftype, max_len, min_len;
4135         struct cifs_ses *ses = tcon->ses;
4136         unsigned int rsp_len, offset;
4137         int flags = 0;
4138 
4139         if (level == FS_DEVICE_INFORMATION) {
4140                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4141                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4142         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4143                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4144                 min_len = MIN_FS_ATTR_INFO_SIZE;
4145         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4146                 max_len = sizeof(struct smb3_fs_ss_info);
4147                 min_len = sizeof(struct smb3_fs_ss_info);
4148         } else if (level == FS_VOLUME_INFORMATION) {
4149                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4150                 min_len = sizeof(struct smb3_fs_vol_info);
4151         } else {
4152                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4153                 return -EINVAL;
4154         }
4155 
4156         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4157                                 persistent_fid, volatile_fid);
4158         if (rc)
4159                 return rc;
4160 
4161         if (smb3_encryption_required(tcon))
4162                 flags |= CIFS_TRANSFORM_REQ;
4163 
4164         memset(&rqst, 0, sizeof(struct smb_rqst));
4165         rqst.rq_iov = &iov;
4166         rqst.rq_nvec = 1;
4167 
4168         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4169         cifs_small_buf_release(iov.iov_base);
4170         if (rc) {
4171                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4172                 goto qfsattr_exit;
4173         }
4174         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4175 
4176         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4177         offset = le16_to_cpu(rsp->OutputBufferOffset);
4178         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4179         if (rc)
4180                 goto qfsattr_exit;
4181 
4182         if (level == FS_ATTRIBUTE_INFORMATION)
4183                 memcpy(&tcon->fsAttrInfo, offset
4184                         + (char *)rsp, min_t(unsigned int,
4185                         rsp_len, max_len));
4186         else if (level == FS_DEVICE_INFORMATION)
4187                 memcpy(&tcon->fsDevInfo, offset
4188                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4189         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4190                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4191                         (offset + (char *)rsp);
4192                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4193                 tcon->perf_sector_size =
4194                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4195         } else if (level == FS_VOLUME_INFORMATION) {
4196                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4197                         (offset + (char *)rsp);
4198                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4199                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4200         }
4201 
4202 qfsattr_exit:
4203         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4204         return rc;
4205 }
4206 
4207 int
4208 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4209            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4210            const __u32 num_lock, struct smb2_lock_element *buf)
4211 {
4212         struct smb_rqst rqst;
4213         int rc = 0;
4214         struct smb2_lock_req *req = NULL;
4215         struct kvec iov[2];
4216         struct kvec rsp_iov;
4217         int resp_buf_type;
4218         unsigned int count;
4219         int flags = CIFS_NO_RESP;
4220         unsigned int total_len;
4221 
4222         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4223 
4224         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4225         if (rc)
4226                 return rc;
4227 
4228         if (smb3_encryption_required(tcon))
4229                 flags |= CIFS_TRANSFORM_REQ;
4230 
4231         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4232         req->LockCount = cpu_to_le16(num_lock);
4233 
4234         req->PersistentFileId = persist_fid;
4235         req->VolatileFileId = volatile_fid;
4236 
4237         count = num_lock * sizeof(struct smb2_lock_element);
4238 
4239         iov[0].iov_base = (char *)req;
4240         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4241         iov[1].iov_base = (char *)buf;
4242         iov[1].iov_len = count;
4243 
4244         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4245 
4246         memset(&rqst, 0, sizeof(struct smb_rqst));
4247         rqst.rq_iov = iov;
4248         rqst.rq_nvec = 2;
4249 
4250         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4251                             &rsp_iov);
4252         cifs_small_buf_release(req);
4253         if (rc) {
4254                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4255                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4256                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4257                                     tcon->ses->Suid, rc);
4258         }
4259 
4260         return rc;
4261 }
4262 
4263 int
4264 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4265           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4266           const __u64 length, const __u64 offset, const __u32 lock_flags,
4267           const bool wait)
4268 {
4269         struct smb2_lock_element lock;
4270 
4271         lock.Offset = cpu_to_le64(offset);
4272         lock.Length = cpu_to_le64(length);
4273         lock.Flags = cpu_to_le32(lock_flags);
4274         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4275                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4276 
4277         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4278 }
4279 
4280 int
4281 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4282                  __u8 *lease_key, const __le32 lease_state)
4283 {
4284         struct smb_rqst rqst;
4285         int rc;
4286         struct smb2_lease_ack *req = NULL;
4287         struct cifs_ses *ses = tcon->ses;
4288         int flags = CIFS_OBREAK_OP;
4289         unsigned int total_len;
4290         struct kvec iov[1];
4291         struct kvec rsp_iov;
4292         int resp_buf_type;
4293         __u64 *please_key_high;
4294         __u64 *please_key_low;
4295 
4296         cifs_dbg(FYI, "SMB2_lease_break\n");
4297         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4298                              &total_len);
4299         if (rc)
4300                 return rc;
4301 
4302         if (smb3_encryption_required(tcon))
4303                 flags |= CIFS_TRANSFORM_REQ;
4304 
4305         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4306         req->StructureSize = cpu_to_le16(36);
4307         total_len += 12;
4308 
4309         memcpy(req->LeaseKey, lease_key, 16);
4310         req->LeaseState = lease_state;
4311 
4312         flags |= CIFS_NO_RESP;
4313 
4314         iov[0].iov_base = (char *)req;
4315         iov[0].iov_len = total_len;
4316 
4317         memset(&rqst, 0, sizeof(struct smb_rqst));
4318         rqst.rq_iov = iov;
4319         rqst.rq_nvec = 1;
4320 
4321         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4322         cifs_small_buf_release(req);
4323 
4324         please_key_low = (__u64 *)req->LeaseKey;
4325         please_key_high = (__u64 *)(req->LeaseKey+8);
4326         if (rc) {
4327                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4328                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4329                         ses->Suid, *please_key_low, *please_key_high, rc);
4330                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4331         } else
4332                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4333                         ses->Suid, *please_key_low, *please_key_high);
4334 
4335         return rc;
4336 }
4337 

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