7d7b016fe8bb0e9edd5523a739e94e37db7291d6
[muen/linux.git] / fs / cifs / smb2pdu.c
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
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         free_rsp_buf(resp_buftype, rsp);
1563         kfree(unc_path);
1564         return rc;
1565
1566 tcon_error_exit:
1567         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1568                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1569         }
1570         goto tcon_exit;
1571 }
1572
1573 int
1574 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1575 {
1576         struct smb_rqst rqst;
1577         struct smb2_tree_disconnect_req *req; /* response is trivial */
1578         int rc = 0;
1579         struct cifs_ses *ses = tcon->ses;
1580         int flags = 0;
1581         unsigned int total_len;
1582         struct kvec iov[1];
1583         struct kvec rsp_iov;
1584         int resp_buf_type;
1585
1586         cifs_dbg(FYI, "Tree Disconnect\n");
1587
1588         if (!ses || !(ses->server))
1589                 return -EIO;
1590
1591         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1592                 return 0;
1593
1594         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1595                              &total_len);
1596         if (rc)
1597                 return rc;
1598
1599         if (smb3_encryption_required(tcon))
1600                 flags |= CIFS_TRANSFORM_REQ;
1601
1602         flags |= CIFS_NO_RESP;
1603
1604         iov[0].iov_base = (char *)req;
1605         iov[0].iov_len = total_len;
1606
1607         memset(&rqst, 0, sizeof(struct smb_rqst));
1608         rqst.rq_iov = iov;
1609         rqst.rq_nvec = 1;
1610
1611         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1612         cifs_small_buf_release(req);
1613         if (rc)
1614                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1615
1616         return rc;
1617 }
1618
1619
1620 static struct create_durable *
1621 create_durable_buf(void)
1622 {
1623         struct create_durable *buf;
1624
1625         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1626         if (!buf)
1627                 return NULL;
1628
1629         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1630                                         (struct create_durable, Data));
1631         buf->ccontext.DataLength = cpu_to_le32(16);
1632         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1633                                 (struct create_durable, Name));
1634         buf->ccontext.NameLength = cpu_to_le16(4);
1635         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1636         buf->Name[0] = 'D';
1637         buf->Name[1] = 'H';
1638         buf->Name[2] = 'n';
1639         buf->Name[3] = 'Q';
1640         return buf;
1641 }
1642
1643 static struct create_durable *
1644 create_reconnect_durable_buf(struct cifs_fid *fid)
1645 {
1646         struct create_durable *buf;
1647
1648         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1649         if (!buf)
1650                 return NULL;
1651
1652         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1653                                         (struct create_durable, Data));
1654         buf->ccontext.DataLength = cpu_to_le32(16);
1655         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1656                                 (struct create_durable, Name));
1657         buf->ccontext.NameLength = cpu_to_le16(4);
1658         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1659         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1660         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1661         buf->Name[0] = 'D';
1662         buf->Name[1] = 'H';
1663         buf->Name[2] = 'n';
1664         buf->Name[3] = 'C';
1665         return buf;
1666 }
1667
1668 static __u8
1669 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1670                   unsigned int *epoch, char *lease_key)
1671 {
1672         char *data_offset;
1673         struct create_context *cc;
1674         unsigned int next;
1675         unsigned int remaining;
1676         char *name;
1677
1678         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1679         remaining = le32_to_cpu(rsp->CreateContextsLength);
1680         cc = (struct create_context *)data_offset;
1681         while (remaining >= sizeof(struct create_context)) {
1682                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1683                 if (le16_to_cpu(cc->NameLength) == 4 &&
1684                     strncmp(name, "RqLs", 4) == 0)
1685                         return server->ops->parse_lease_buf(cc, epoch,
1686                                                             lease_key);
1687
1688                 next = le32_to_cpu(cc->Next);
1689                 if (!next)
1690                         break;
1691                 remaining -= next;
1692                 cc = (struct create_context *)((char *)cc + next);
1693         }
1694
1695         return 0;
1696 }
1697
1698 static int
1699 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1700                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1701 {
1702         struct smb2_create_req *req = iov[0].iov_base;
1703         unsigned int num = *num_iovec;
1704
1705         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1706         if (iov[num].iov_base == NULL)
1707                 return -ENOMEM;
1708         iov[num].iov_len = server->vals->create_lease_size;
1709         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1710         if (!req->CreateContextsOffset)
1711                 req->CreateContextsOffset = cpu_to_le32(
1712                                 sizeof(struct smb2_create_req) +
1713                                 iov[num - 1].iov_len);
1714         le32_add_cpu(&req->CreateContextsLength,
1715                      server->vals->create_lease_size);
1716         *num_iovec = num + 1;
1717         return 0;
1718 }
1719
1720 static struct create_durable_v2 *
1721 create_durable_v2_buf(struct cifs_fid *pfid)
1722 {
1723         struct create_durable_v2 *buf;
1724
1725         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1726         if (!buf)
1727                 return NULL;
1728
1729         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1730                                         (struct create_durable_v2, dcontext));
1731         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1732         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1733                                 (struct create_durable_v2, Name));
1734         buf->ccontext.NameLength = cpu_to_le16(4);
1735
1736         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1737         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1738         generate_random_uuid(buf->dcontext.CreateGuid);
1739         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1740
1741         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1742         buf->Name[0] = 'D';
1743         buf->Name[1] = 'H';
1744         buf->Name[2] = '2';
1745         buf->Name[3] = 'Q';
1746         return buf;
1747 }
1748
1749 static struct create_durable_handle_reconnect_v2 *
1750 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1751 {
1752         struct create_durable_handle_reconnect_v2 *buf;
1753
1754         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1755                         GFP_KERNEL);
1756         if (!buf)
1757                 return NULL;
1758
1759         buf->ccontext.DataOffset =
1760                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1761                                      dcontext));
1762         buf->ccontext.DataLength =
1763                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1764         buf->ccontext.NameOffset =
1765                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1766                             Name));
1767         buf->ccontext.NameLength = cpu_to_le16(4);
1768
1769         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1770         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1771         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1772         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1773
1774         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1775         buf->Name[0] = 'D';
1776         buf->Name[1] = 'H';
1777         buf->Name[2] = '2';
1778         buf->Name[3] = 'C';
1779         return buf;
1780 }
1781
1782 static int
1783 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1784                     struct cifs_open_parms *oparms)
1785 {
1786         struct smb2_create_req *req = iov[0].iov_base;
1787         unsigned int num = *num_iovec;
1788
1789         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1790         if (iov[num].iov_base == NULL)
1791                 return -ENOMEM;
1792         iov[num].iov_len = sizeof(struct create_durable_v2);
1793         if (!req->CreateContextsOffset)
1794                 req->CreateContextsOffset =
1795                         cpu_to_le32(sizeof(struct smb2_create_req) +
1796                                                                 iov[1].iov_len);
1797         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1798         *num_iovec = num + 1;
1799         return 0;
1800 }
1801
1802 static int
1803 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1804                     struct cifs_open_parms *oparms)
1805 {
1806         struct smb2_create_req *req = iov[0].iov_base;
1807         unsigned int num = *num_iovec;
1808
1809         /* indicate that we don't need to relock the file */
1810         oparms->reconnect = false;
1811
1812         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1813         if (iov[num].iov_base == NULL)
1814                 return -ENOMEM;
1815         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1816         if (!req->CreateContextsOffset)
1817                 req->CreateContextsOffset =
1818                         cpu_to_le32(sizeof(struct smb2_create_req) +
1819                                                                 iov[1].iov_len);
1820         le32_add_cpu(&req->CreateContextsLength,
1821                         sizeof(struct create_durable_handle_reconnect_v2));
1822         *num_iovec = num + 1;
1823         return 0;
1824 }
1825
1826 static int
1827 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1828                     struct cifs_open_parms *oparms, bool use_persistent)
1829 {
1830         struct smb2_create_req *req = iov[0].iov_base;
1831         unsigned int num = *num_iovec;
1832
1833         if (use_persistent) {
1834                 if (oparms->reconnect)
1835                         return add_durable_reconnect_v2_context(iov, num_iovec,
1836                                                                 oparms);
1837                 else
1838                         return add_durable_v2_context(iov, num_iovec, oparms);
1839         }
1840
1841         if (oparms->reconnect) {
1842                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1843                 /* indicate that we don't need to relock the file */
1844                 oparms->reconnect = false;
1845         } else
1846                 iov[num].iov_base = create_durable_buf();
1847         if (iov[num].iov_base == NULL)
1848                 return -ENOMEM;
1849         iov[num].iov_len = sizeof(struct create_durable);
1850         if (!req->CreateContextsOffset)
1851                 req->CreateContextsOffset =
1852                         cpu_to_le32(sizeof(struct smb2_create_req) +
1853                                                                 iov[1].iov_len);
1854         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1855         *num_iovec = num + 1;
1856         return 0;
1857 }
1858
1859 /* See MS-SMB2 2.2.13.2.7 */
1860 static struct crt_twarp_ctxt *
1861 create_twarp_buf(__u64 timewarp)
1862 {
1863         struct crt_twarp_ctxt *buf;
1864
1865         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1866         if (!buf)
1867                 return NULL;
1868
1869         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1870                                         (struct crt_twarp_ctxt, Timestamp));
1871         buf->ccontext.DataLength = cpu_to_le32(8);
1872         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1873                                 (struct crt_twarp_ctxt, Name));
1874         buf->ccontext.NameLength = cpu_to_le16(4);
1875         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1876         buf->Name[0] = 'T';
1877         buf->Name[1] = 'W';
1878         buf->Name[2] = 'r';
1879         buf->Name[3] = 'p';
1880         buf->Timestamp = cpu_to_le64(timewarp);
1881         return buf;
1882 }
1883
1884 /* See MS-SMB2 2.2.13.2.7 */
1885 static int
1886 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1887 {
1888         struct smb2_create_req *req = iov[0].iov_base;
1889         unsigned int num = *num_iovec;
1890
1891         iov[num].iov_base = create_twarp_buf(timewarp);
1892         if (iov[num].iov_base == NULL)
1893                 return -ENOMEM;
1894         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1895         if (!req->CreateContextsOffset)
1896                 req->CreateContextsOffset = cpu_to_le32(
1897                                 sizeof(struct smb2_create_req) +
1898                                 iov[num - 1].iov_len);
1899         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1900         *num_iovec = num + 1;
1901         return 0;
1902 }
1903
1904 static int
1905 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1906                             const char *treename, const __le16 *path)
1907 {
1908         int treename_len, path_len;
1909         struct nls_table *cp;
1910         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1911
1912         /*
1913          * skip leading "\\"
1914          */
1915         treename_len = strlen(treename);
1916         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1917                 return -EINVAL;
1918
1919         treename += 2;
1920         treename_len -= 2;
1921
1922         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1923
1924         /*
1925          * make room for one path separator between the treename and
1926          * path
1927          */
1928         *out_len = treename_len + 1 + path_len;
1929
1930         /*
1931          * final path needs to be null-terminated UTF16 with a
1932          * size aligned to 8
1933          */
1934
1935         *out_size = roundup((*out_len+1)*2, 8);
1936         *out_path = kzalloc(*out_size, GFP_KERNEL);
1937         if (!*out_path)
1938                 return -ENOMEM;
1939
1940         cp = load_nls_default();
1941         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1942         UniStrcat(*out_path, sep);
1943         UniStrcat(*out_path, path);
1944         unload_nls(cp);
1945
1946         return 0;
1947 }
1948
1949 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1950                                umode_t mode, struct cifs_tcon *tcon,
1951                                const char *full_path,
1952                                struct cifs_sb_info *cifs_sb)
1953 {
1954         struct smb_rqst rqst;
1955         struct smb2_create_req *req;
1956         struct smb2_create_rsp *rsp = NULL;
1957         struct TCP_Server_Info *server;
1958         struct cifs_ses *ses = tcon->ses;
1959         struct kvec iov[3]; /* make sure at least one for each open context */
1960         struct kvec rsp_iov = {NULL, 0};
1961         int resp_buftype;
1962         int uni_path_len;
1963         __le16 *copy_path = NULL;
1964         int copy_size;
1965         int rc = 0;
1966         unsigned int n_iov = 2;
1967         __u32 file_attributes = 0;
1968         char *pc_buf = NULL;
1969         int flags = 0;
1970         unsigned int total_len;
1971         __le16 *utf16_path = NULL;
1972
1973         cifs_dbg(FYI, "mkdir\n");
1974
1975         /* resource #1: path allocation */
1976         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1977         if (!utf16_path)
1978                 return -ENOMEM;
1979
1980         if (ses && (ses->server))
1981                 server = ses->server;
1982         else {
1983                 rc = -EIO;
1984                 goto err_free_path;
1985         }
1986
1987         /* resource #2: request */
1988         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1989         if (rc)
1990                 goto err_free_path;
1991
1992
1993         if (smb3_encryption_required(tcon))
1994                 flags |= CIFS_TRANSFORM_REQ;
1995
1996         req->ImpersonationLevel = IL_IMPERSONATION;
1997         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1998         /* File attributes ignored on open (used in create though) */
1999         req->FileAttributes = cpu_to_le32(file_attributes);
2000         req->ShareAccess = FILE_SHARE_ALL_LE;
2001         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2002         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2003
2004         iov[0].iov_base = (char *)req;
2005         /* -1 since last byte is buf[0] which is sent below (path) */
2006         iov[0].iov_len = total_len - 1;
2007
2008         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2009
2010         /* [MS-SMB2] 2.2.13 NameOffset:
2011          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2012          * the SMB2 header, the file name includes a prefix that will
2013          * be processed during DFS name normalization as specified in
2014          * section 3.3.5.9. Otherwise, the file name is relative to
2015          * the share that is identified by the TreeId in the SMB2
2016          * header.
2017          */
2018         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2019                 int name_len;
2020
2021                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2022                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2023                                                  &name_len,
2024                                                  tcon->treeName, utf16_path);
2025                 if (rc)
2026                         goto err_free_req;
2027
2028                 req->NameLength = cpu_to_le16(name_len * 2);
2029                 uni_path_len = copy_size;
2030                 /* free before overwriting resource */
2031                 kfree(utf16_path);
2032                 utf16_path = copy_path;
2033         } else {
2034                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2035                 /* MUST set path len (NameLength) to 0 opening root of share */
2036                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2037                 if (uni_path_len % 8 != 0) {
2038                         copy_size = roundup(uni_path_len, 8);
2039                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2040                         if (!copy_path) {
2041                                 rc = -ENOMEM;
2042                                 goto err_free_req;
2043                         }
2044                         memcpy((char *)copy_path, (const char *)utf16_path,
2045                                uni_path_len);
2046                         uni_path_len = copy_size;
2047                         /* free before overwriting resource */
2048                         kfree(utf16_path);
2049                         utf16_path = copy_path;
2050                 }
2051         }
2052
2053         iov[1].iov_len = uni_path_len;
2054         iov[1].iov_base = utf16_path;
2055         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2056
2057         if (tcon->posix_extensions) {
2058                 /* resource #3: posix buf */
2059                 rc = add_posix_context(iov, &n_iov, mode);
2060                 if (rc)
2061                         goto err_free_req;
2062                 pc_buf = iov[n_iov-1].iov_base;
2063         }
2064
2065
2066         memset(&rqst, 0, sizeof(struct smb_rqst));
2067         rqst.rq_iov = iov;
2068         rqst.rq_nvec = n_iov;
2069
2070         /* resource #4: response buffer */
2071         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2072         if (rc) {
2073                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2074                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2075                                            CREATE_NOT_FILE,
2076                                            FILE_WRITE_ATTRIBUTES, rc);
2077                 goto err_free_rsp_buf;
2078         }
2079
2080         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2081         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2082                                     ses->Suid, CREATE_NOT_FILE,
2083                                     FILE_WRITE_ATTRIBUTES);
2084
2085         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2086
2087         /* Eventually save off posix specific response info and timestaps */
2088
2089 err_free_rsp_buf:
2090         free_rsp_buf(resp_buftype, rsp);
2091         kfree(pc_buf);
2092 err_free_req:
2093         cifs_small_buf_release(req);
2094 err_free_path:
2095         kfree(utf16_path);
2096         return rc;
2097 }
2098
2099 int
2100 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2101                struct cifs_open_parms *oparms, __le16 *path)
2102 {
2103         struct TCP_Server_Info *server = tcon->ses->server;
2104         struct smb2_create_req *req;
2105         unsigned int n_iov = 2;
2106         __u32 file_attributes = 0;
2107         int copy_size;
2108         int uni_path_len;
2109         unsigned int total_len;
2110         struct kvec *iov = rqst->rq_iov;
2111         __le16 *copy_path;
2112         int rc;
2113
2114         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2115         if (rc)
2116                 return rc;
2117
2118         iov[0].iov_base = (char *)req;
2119         /* -1 since last byte is buf[0] which is sent below (path) */
2120         iov[0].iov_len = total_len - 1;
2121
2122         if (oparms->create_options & CREATE_OPTION_READONLY)
2123                 file_attributes |= ATTR_READONLY;
2124         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2125                 file_attributes |= ATTR_SYSTEM;
2126
2127         req->ImpersonationLevel = IL_IMPERSONATION;
2128         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2129         /* File attributes ignored on open (used in create though) */
2130         req->FileAttributes = cpu_to_le32(file_attributes);
2131         req->ShareAccess = FILE_SHARE_ALL_LE;
2132         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2133         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2134         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2135
2136         /* [MS-SMB2] 2.2.13 NameOffset:
2137          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2138          * the SMB2 header, the file name includes a prefix that will
2139          * be processed during DFS name normalization as specified in
2140          * section 3.3.5.9. Otherwise, the file name is relative to
2141          * the share that is identified by the TreeId in the SMB2
2142          * header.
2143          */
2144         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2145                 int name_len;
2146
2147                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2148                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2149                                                  &name_len,
2150                                                  tcon->treeName, path);
2151                 if (rc)
2152                         return rc;
2153                 req->NameLength = cpu_to_le16(name_len * 2);
2154                 uni_path_len = copy_size;
2155                 path = copy_path;
2156         } else {
2157                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2158                 /* MUST set path len (NameLength) to 0 opening root of share */
2159                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2160                 copy_size = uni_path_len;
2161                 if (copy_size % 8 != 0)
2162                         copy_size = roundup(copy_size, 8);
2163                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2164                 if (!copy_path)
2165                         return -ENOMEM;
2166                 memcpy((char *)copy_path, (const char *)path,
2167                        uni_path_len);
2168                 uni_path_len = copy_size;
2169                 path = copy_path;
2170         }
2171
2172         iov[1].iov_len = uni_path_len;
2173         iov[1].iov_base = path;
2174
2175         if (!server->oplocks)
2176                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2177
2178         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2179             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2180                 req->RequestedOplockLevel = *oplock;
2181         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2182                   (oparms->create_options & CREATE_NOT_FILE))
2183                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2184         else {
2185                 rc = add_lease_context(server, iov, &n_iov,
2186                                        oparms->fid->lease_key, oplock);
2187                 if (rc)
2188                         return rc;
2189         }
2190
2191         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2192                 /* need to set Next field of lease context if we request it */
2193                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2194                         struct create_context *ccontext =
2195                             (struct create_context *)iov[n_iov-1].iov_base;
2196                         ccontext->Next =
2197                                 cpu_to_le32(server->vals->create_lease_size);
2198                 }
2199
2200                 rc = add_durable_context(iov, &n_iov, oparms,
2201                                         tcon->use_persistent);
2202                 if (rc)
2203                         return rc;
2204         }
2205
2206         if (tcon->posix_extensions) {
2207                 if (n_iov > 2) {
2208                         struct create_context *ccontext =
2209                             (struct create_context *)iov[n_iov-1].iov_base;
2210                         ccontext->Next =
2211                                 cpu_to_le32(iov[n_iov-1].iov_len);
2212                 }
2213
2214                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2215                 if (rc)
2216                         return rc;
2217         }
2218
2219         if (tcon->snapshot_time) {
2220                 cifs_dbg(FYI, "adding snapshot context\n");
2221                 if (n_iov > 2) {
2222                         struct create_context *ccontext =
2223                             (struct create_context *)iov[n_iov-1].iov_base;
2224                         ccontext->Next =
2225                                 cpu_to_le32(iov[n_iov-1].iov_len);
2226                 }
2227
2228                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2229                 if (rc)
2230                         return rc;
2231         }
2232
2233
2234         rqst->rq_nvec = n_iov;
2235         return 0;
2236 }
2237
2238 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2239  * All other vectors are freed by kfree().
2240  */
2241 void
2242 SMB2_open_free(struct smb_rqst *rqst)
2243 {
2244         int i;
2245
2246         if (rqst && rqst->rq_iov) {
2247                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2248                 for (i = 1; i < rqst->rq_nvec; i++)
2249                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2250                                 kfree(rqst->rq_iov[i].iov_base);
2251         }
2252 }
2253
2254 int
2255 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2256           __u8 *oplock, struct smb2_file_all_info *buf,
2257           struct kvec *err_iov, int *buftype)
2258 {
2259         struct smb_rqst rqst;
2260         struct smb2_create_rsp *rsp = NULL;
2261         struct TCP_Server_Info *server;
2262         struct cifs_tcon *tcon = oparms->tcon;
2263         struct cifs_ses *ses = tcon->ses;
2264         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2265         struct kvec rsp_iov = {NULL, 0};
2266         int resp_buftype = CIFS_NO_BUFFER;
2267         int rc = 0;
2268         int flags = 0;
2269
2270         cifs_dbg(FYI, "create/open\n");
2271         if (ses && (ses->server))
2272                 server = ses->server;
2273         else
2274                 return -EIO;
2275
2276         if (smb3_encryption_required(tcon))
2277                 flags |= CIFS_TRANSFORM_REQ;
2278
2279         memset(&rqst, 0, sizeof(struct smb_rqst));
2280         memset(&iov, 0, sizeof(iov));
2281         rqst.rq_iov = iov;
2282         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2283
2284         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2285         if (rc)
2286                 goto creat_exit;
2287
2288         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2289                             &rsp_iov);
2290         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2291
2292         if (rc != 0) {
2293                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2294                 if (err_iov && rsp) {
2295                         *err_iov = rsp_iov;
2296                         *buftype = resp_buftype;
2297                         resp_buftype = CIFS_NO_BUFFER;
2298                         rsp = NULL;
2299                 }
2300                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2301                                     oparms->create_options, oparms->desired_access, rc);
2302                 goto creat_exit;
2303         } else
2304                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2305                                      ses->Suid, oparms->create_options,
2306                                      oparms->desired_access);
2307
2308         atomic_inc(&tcon->num_remote_opens);
2309         oparms->fid->persistent_fid = rsp->PersistentFileId;
2310         oparms->fid->volatile_fid = rsp->VolatileFileId;
2311
2312         if (buf) {
2313                 memcpy(buf, &rsp->CreationTime, 32);
2314                 buf->AllocationSize = rsp->AllocationSize;
2315                 buf->EndOfFile = rsp->EndofFile;
2316                 buf->Attributes = rsp->FileAttributes;
2317                 buf->NumberOfLinks = cpu_to_le32(1);
2318                 buf->DeletePending = 0;
2319         }
2320
2321         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2322                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2323                                             oparms->fid->lease_key);
2324         else
2325                 *oplock = rsp->OplockLevel;
2326 creat_exit:
2327         SMB2_open_free(&rqst);
2328         free_rsp_buf(resp_buftype, rsp);
2329         return rc;
2330 }
2331
2332 /*
2333  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2334  */
2335 int
2336 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2337            u64 volatile_fid, u32 opcode, bool is_fsctl,
2338            char *in_data, u32 indatalen,
2339            char **out_data, u32 *plen /* returned data len */)
2340 {
2341         struct smb_rqst rqst;
2342         struct smb2_ioctl_req *req;
2343         struct smb2_ioctl_rsp *rsp;
2344         struct cifs_ses *ses;
2345         struct kvec iov[2];
2346         struct kvec rsp_iov;
2347         int resp_buftype;
2348         int n_iov;
2349         int rc = 0;
2350         int flags = 0;
2351         unsigned int total_len;
2352
2353         cifs_dbg(FYI, "SMB2 IOCTL\n");
2354
2355         if (out_data != NULL)
2356                 *out_data = NULL;
2357
2358         /* zero out returned data len, in case of error */
2359         if (plen)
2360                 *plen = 0;
2361
2362         if (tcon)
2363                 ses = tcon->ses;
2364         else
2365                 return -EIO;
2366
2367         if (!ses || !(ses->server))
2368                 return -EIO;
2369
2370         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2371         if (rc)
2372                 return rc;
2373
2374         if (smb3_encryption_required(tcon))
2375                 flags |= CIFS_TRANSFORM_REQ;
2376
2377         req->CtlCode = cpu_to_le32(opcode);
2378         req->PersistentFileId = persistent_fid;
2379         req->VolatileFileId = volatile_fid;
2380
2381         if (indatalen) {
2382                 req->InputCount = cpu_to_le32(indatalen);
2383                 /* do not set InputOffset if no input data */
2384                 req->InputOffset =
2385                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2386                 iov[1].iov_base = in_data;
2387                 iov[1].iov_len = indatalen;
2388                 n_iov = 2;
2389         } else
2390                 n_iov = 1;
2391
2392         req->OutputOffset = 0;
2393         req->OutputCount = 0; /* MBZ */
2394
2395         /*
2396          * Could increase MaxOutputResponse, but that would require more
2397          * than one credit. Windows typically sets this smaller, but for some
2398          * ioctls it may be useful to allow server to send more. No point
2399          * limiting what the server can send as long as fits in one credit
2400          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2401          * (by default, note that it can be overridden to make max larger)
2402          * in responses (except for read responses which can be bigger.
2403          * We may want to bump this limit up
2404          */
2405         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2406
2407         if (is_fsctl)
2408                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2409         else
2410                 req->Flags = 0;
2411
2412         iov[0].iov_base = (char *)req;
2413
2414         /*
2415          * If no input data, the size of ioctl struct in
2416          * protocol spec still includes a 1 byte data buffer,
2417          * but if input data passed to ioctl, we do not
2418          * want to double count this, so we do not send
2419          * the dummy one byte of data in iovec[0] if sending
2420          * input data (in iovec[1]).
2421          */
2422
2423         if (indatalen) {
2424                 iov[0].iov_len = total_len - 1;
2425         } else
2426                 iov[0].iov_len = total_len;
2427
2428         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2429         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2430                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2431
2432         memset(&rqst, 0, sizeof(struct smb_rqst));
2433         rqst.rq_iov = iov;
2434         rqst.rq_nvec = n_iov;
2435
2436         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2437                             &rsp_iov);
2438         cifs_small_buf_release(req);
2439         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2440
2441         if (rc != 0)
2442                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2443                                 ses->Suid, 0, opcode, rc);
2444
2445         if ((rc != 0) && (rc != -EINVAL)) {
2446                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2447                 goto ioctl_exit;
2448         } else if (rc == -EINVAL) {
2449                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2450                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2451                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2452                         goto ioctl_exit;
2453                 }
2454         }
2455
2456         /* check if caller wants to look at return data or just return rc */
2457         if ((plen == NULL) || (out_data == NULL))
2458                 goto ioctl_exit;
2459
2460         *plen = le32_to_cpu(rsp->OutputCount);
2461
2462         /* We check for obvious errors in the output buffer length and offset */
2463         if (*plen == 0)
2464                 goto ioctl_exit; /* server returned no data */
2465         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2466                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2467                 *plen = 0;
2468                 rc = -EIO;
2469                 goto ioctl_exit;
2470         }
2471
2472         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2473                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2474                         le32_to_cpu(rsp->OutputOffset));
2475                 *plen = 0;
2476                 rc = -EIO;
2477                 goto ioctl_exit;
2478         }
2479
2480         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2481                             *plen, GFP_KERNEL);
2482         if (*out_data == NULL) {
2483                 rc = -ENOMEM;
2484                 goto ioctl_exit;
2485         }
2486
2487 ioctl_exit:
2488         free_rsp_buf(resp_buftype, rsp);
2489         return rc;
2490 }
2491
2492 /*
2493  *   Individual callers to ioctl worker function follow
2494  */
2495
2496 int
2497 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2498                      u64 persistent_fid, u64 volatile_fid)
2499 {
2500         int rc;
2501         struct  compress_ioctl fsctl_input;
2502         char *ret_data = NULL;
2503
2504         fsctl_input.CompressionState =
2505                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2506
2507         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2508                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2509                         (char *)&fsctl_input /* data input */,
2510                         2 /* in data len */, &ret_data /* out data */, NULL);
2511
2512         cifs_dbg(FYI, "set compression rc %d\n", rc);
2513
2514         return rc;
2515 }
2516
2517 int
2518 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2519                 u64 persistent_fid, u64 volatile_fid)
2520 {
2521         struct smb2_close_req *req;
2522         struct kvec *iov = rqst->rq_iov;
2523         unsigned int total_len;
2524         int rc;
2525
2526         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2527         if (rc)
2528                 return rc;
2529
2530         req->PersistentFileId = persistent_fid;
2531         req->VolatileFileId = volatile_fid;
2532         iov[0].iov_base = (char *)req;
2533         iov[0].iov_len = total_len;
2534
2535         return 0;
2536 }
2537
2538 void
2539 SMB2_close_free(struct smb_rqst *rqst)
2540 {
2541         if (rqst && rqst->rq_iov)
2542                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2543 }
2544
2545 int
2546 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2547                  u64 persistent_fid, u64 volatile_fid, int flags)
2548 {
2549         struct smb_rqst rqst;
2550         struct smb2_close_rsp *rsp = NULL;
2551         struct cifs_ses *ses = tcon->ses;
2552         struct kvec iov[1];
2553         struct kvec rsp_iov;
2554         int resp_buftype = CIFS_NO_BUFFER;
2555         int rc = 0;
2556
2557         cifs_dbg(FYI, "Close\n");
2558
2559         if (!ses || !(ses->server))
2560                 return -EIO;
2561
2562         if (smb3_encryption_required(tcon))
2563                 flags |= CIFS_TRANSFORM_REQ;
2564
2565         memset(&rqst, 0, sizeof(struct smb_rqst));
2566         memset(&iov, 0, sizeof(iov));
2567         rqst.rq_iov = iov;
2568         rqst.rq_nvec = 1;
2569
2570         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2571         if (rc)
2572                 goto close_exit;
2573
2574         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2575         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2576
2577         if (rc != 0) {
2578                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2579                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2580                                      rc);
2581                 goto close_exit;
2582         }
2583
2584         atomic_dec(&tcon->num_remote_opens);
2585
2586         /* BB FIXME - decode close response, update inode for caching */
2587
2588 close_exit:
2589         SMB2_close_free(&rqst);
2590         free_rsp_buf(resp_buftype, rsp);
2591         return rc;
2592 }
2593
2594 int
2595 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2596            u64 persistent_fid, u64 volatile_fid)
2597 {
2598         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2599 }
2600
2601 int
2602 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2603                   struct kvec *iov, unsigned int min_buf_size)
2604 {
2605         unsigned int smb_len = iov->iov_len;
2606         char *end_of_smb = smb_len + (char *)iov->iov_base;
2607         char *begin_of_buf = offset + (char *)iov->iov_base;
2608         char *end_of_buf = begin_of_buf + buffer_length;
2609
2610
2611         if (buffer_length < min_buf_size) {
2612                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2613                          buffer_length, min_buf_size);
2614                 return -EINVAL;
2615         }
2616
2617         /* check if beyond RFC1001 maximum length */
2618         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2619                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2620                          buffer_length, smb_len);
2621                 return -EINVAL;
2622         }
2623
2624         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2625                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2626                 return -EINVAL;
2627         }
2628
2629         return 0;
2630 }
2631
2632 /*
2633  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2634  * Caller must free buffer.
2635  */
2636 int
2637 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2638                            struct kvec *iov, unsigned int minbufsize,
2639                            char *data)
2640 {
2641         char *begin_of_buf = offset + (char *)iov->iov_base;
2642         int rc;
2643
2644         if (!data)
2645                 return -EINVAL;
2646
2647         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2648         if (rc)
2649                 return rc;
2650
2651         memcpy(data, begin_of_buf, buffer_length);
2652
2653         return 0;
2654 }
2655
2656 int
2657 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2658                      u64 persistent_fid, u64 volatile_fid,
2659                      u8 info_class, u8 info_type, u32 additional_info,
2660                      size_t output_len, size_t input_len, void *input)
2661 {
2662         struct smb2_query_info_req *req;
2663         struct kvec *iov = rqst->rq_iov;
2664         unsigned int total_len;
2665         int rc;
2666
2667         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2668                              &total_len);
2669         if (rc)
2670                 return rc;
2671
2672         req->InfoType = info_type;
2673         req->FileInfoClass = info_class;
2674         req->PersistentFileId = persistent_fid;
2675         req->VolatileFileId = volatile_fid;
2676         req->AdditionalInformation = cpu_to_le32(additional_info);
2677
2678         req->OutputBufferLength = cpu_to_le32(output_len);
2679         if (input_len) {
2680                 req->InputBufferLength = cpu_to_le32(input_len);
2681                 /* total_len for smb query request never close to le16 max */
2682                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2683                 memcpy(req->Buffer, input, input_len);
2684         }
2685
2686         iov[0].iov_base = (char *)req;
2687         /* 1 for Buffer */
2688         iov[0].iov_len = total_len - 1 + input_len;
2689         return 0;
2690 }
2691
2692 void
2693 SMB2_query_info_free(struct smb_rqst *rqst)
2694 {
2695         if (rqst && rqst->rq_iov)
2696                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2697 }
2698
2699 static int
2700 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2701            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2702            u32 additional_info, size_t output_len, size_t min_len, void **data,
2703                 u32 *dlen)
2704 {
2705         struct smb_rqst rqst;
2706         struct smb2_query_info_rsp *rsp = NULL;
2707         struct kvec iov[1];
2708         struct kvec rsp_iov;
2709         int rc = 0;
2710         int resp_buftype = CIFS_NO_BUFFER;
2711         struct cifs_ses *ses = tcon->ses;
2712         int flags = 0;
2713
2714         cifs_dbg(FYI, "Query Info\n");
2715
2716         if (!ses || !(ses->server))
2717                 return -EIO;
2718
2719         if (smb3_encryption_required(tcon))
2720                 flags |= CIFS_TRANSFORM_REQ;
2721
2722         memset(&rqst, 0, sizeof(struct smb_rqst));
2723         memset(&iov, 0, sizeof(iov));
2724         rqst.rq_iov = iov;
2725         rqst.rq_nvec = 1;
2726
2727         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2728                                   info_class, info_type, additional_info,
2729                                   output_len, 0, NULL);
2730         if (rc)
2731                 goto qinf_exit;
2732
2733         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2734         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2735
2736         if (rc) {
2737                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2738                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2739                                 ses->Suid, info_class, (__u32)info_type, rc);
2740                 goto qinf_exit;
2741         }
2742
2743         if (dlen) {
2744                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2745                 if (!*data) {
2746                         *data = kmalloc(*dlen, GFP_KERNEL);
2747                         if (!*data) {
2748                                 cifs_dbg(VFS,
2749                                         "Error %d allocating memory for acl\n",
2750                                         rc);
2751                                 *dlen = 0;
2752                                 goto qinf_exit;
2753                         }
2754                 }
2755         }
2756
2757         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2758                                         le32_to_cpu(rsp->OutputBufferLength),
2759                                         &rsp_iov, min_len, *data);
2760
2761 qinf_exit:
2762         SMB2_query_info_free(&rqst);
2763         free_rsp_buf(resp_buftype, rsp);
2764         return rc;
2765 }
2766
2767 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2768                    u64 persistent_fid, u64 volatile_fid,
2769                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2770 {
2771         return query_info(xid, tcon, persistent_fid, volatile_fid,
2772                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2773                           ea_buf_size,
2774                           sizeof(struct smb2_file_full_ea_info),
2775                           (void **)&data,
2776                           NULL);
2777 }
2778
2779 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2780         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2781 {
2782         return query_info(xid, tcon, persistent_fid, volatile_fid,
2783                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2784                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2785                           sizeof(struct smb2_file_all_info), (void **)&data,
2786                           NULL);
2787 }
2788
2789 int
2790 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2791                 u64 persistent_fid, u64 volatile_fid,
2792                 void **data, u32 *plen)
2793 {
2794         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2795         *plen = 0;
2796
2797         return query_info(xid, tcon, persistent_fid, volatile_fid,
2798                           0, SMB2_O_INFO_SECURITY, additional_info,
2799                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2800 }
2801
2802 int
2803 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2804                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2805 {
2806         return query_info(xid, tcon, persistent_fid, volatile_fid,
2807                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2808                           sizeof(struct smb2_file_internal_info),
2809                           sizeof(struct smb2_file_internal_info),
2810                           (void **)&uniqueid, NULL);
2811 }
2812
2813 /*
2814  * This is a no-op for now. We're not really interested in the reply, but
2815  * rather in the fact that the server sent one and that server->lstrp
2816  * gets updated.
2817  *
2818  * FIXME: maybe we should consider checking that the reply matches request?
2819  */
2820 static void
2821 smb2_echo_callback(struct mid_q_entry *mid)
2822 {
2823         struct TCP_Server_Info *server = mid->callback_data;
2824         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2825         unsigned int credits_received = 1;
2826
2827         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2828                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2829
2830         DeleteMidQEntry(mid);
2831         add_credits(server, credits_received, CIFS_ECHO_OP);
2832 }
2833
2834 void smb2_reconnect_server(struct work_struct *work)
2835 {
2836         struct TCP_Server_Info *server = container_of(work,
2837                                         struct TCP_Server_Info, reconnect.work);
2838         struct cifs_ses *ses;
2839         struct cifs_tcon *tcon, *tcon2;
2840         struct list_head tmp_list;
2841         int tcon_exist = false;
2842         int rc;
2843         int resched = false;
2844
2845
2846         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2847         mutex_lock(&server->reconnect_mutex);
2848
2849         INIT_LIST_HEAD(&tmp_list);
2850         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2851
2852         spin_lock(&cifs_tcp_ses_lock);
2853         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2854                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2855                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2856                                 tcon->tc_count++;
2857                                 list_add_tail(&tcon->rlist, &tmp_list);
2858                                 tcon_exist = true;
2859                         }
2860                 }
2861                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2862                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2863                         tcon_exist = true;
2864                 }
2865         }
2866         /*
2867          * Get the reference to server struct to be sure that the last call of
2868          * cifs_put_tcon() in the loop below won't release the server pointer.
2869          */
2870         if (tcon_exist)
2871                 server->srv_count++;
2872
2873         spin_unlock(&cifs_tcp_ses_lock);
2874
2875         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2876                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2877                 if (!rc)
2878                         cifs_reopen_persistent_handles(tcon);
2879                 else
2880                         resched = true;
2881                 list_del_init(&tcon->rlist);
2882                 cifs_put_tcon(tcon);
2883         }
2884
2885         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2886         if (resched)
2887                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2888         mutex_unlock(&server->reconnect_mutex);
2889
2890         /* now we can safely release srv struct */
2891         if (tcon_exist)
2892                 cifs_put_tcp_session(server, 1);
2893 }
2894
2895 int
2896 SMB2_echo(struct TCP_Server_Info *server)
2897 {
2898         struct smb2_echo_req *req;
2899         int rc = 0;
2900         struct kvec iov[1];
2901         struct smb_rqst rqst = { .rq_iov = iov,
2902                                  .rq_nvec = 1 };
2903         unsigned int total_len;
2904
2905         cifs_dbg(FYI, "In echo request\n");
2906
2907         if (server->tcpStatus == CifsNeedNegotiate) {
2908                 /* No need to send echo on newly established connections */
2909                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2910                 return rc;
2911         }
2912
2913         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2914         if (rc)
2915                 return rc;
2916
2917         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2918
2919         iov[0].iov_len = total_len;
2920         iov[0].iov_base = (char *)req;
2921
2922         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2923                              server, CIFS_ECHO_OP);
2924         if (rc)
2925                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2926
2927         cifs_small_buf_release(req);
2928         return rc;
2929 }
2930
2931 int
2932 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2933            u64 volatile_fid)
2934 {
2935         struct smb_rqst rqst;
2936         struct smb2_flush_req *req;
2937         struct cifs_ses *ses = tcon->ses;
2938         struct kvec iov[1];
2939         struct kvec rsp_iov;
2940         int resp_buftype;
2941         int rc = 0;
2942         int flags = 0;
2943         unsigned int total_len;
2944
2945         cifs_dbg(FYI, "Flush\n");
2946
2947         if (!ses || !(ses->server))
2948                 return -EIO;
2949
2950         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2951         if (rc)
2952                 return rc;
2953
2954         if (smb3_encryption_required(tcon))
2955                 flags |= CIFS_TRANSFORM_REQ;
2956
2957         req->PersistentFileId = persistent_fid;
2958         req->VolatileFileId = volatile_fid;
2959
2960         iov[0].iov_base = (char *)req;
2961         iov[0].iov_len = total_len;
2962
2963         memset(&rqst, 0, sizeof(struct smb_rqst));
2964         rqst.rq_iov = iov;
2965         rqst.rq_nvec = 1;
2966
2967         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2968         cifs_small_buf_release(req);
2969
2970         if (rc != 0) {
2971                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2972                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2973                                      rc);
2974         }
2975
2976         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2977         return rc;
2978 }
2979
2980 /*
2981  * To form a chain of read requests, any read requests after the first should
2982  * have the end_of_chain boolean set to true.
2983  */
2984 static int
2985 smb2_new_read_req(void **buf, unsigned int *total_len,
2986         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2987         unsigned int remaining_bytes, int request_type)
2988 {
2989         int rc = -EACCES;
2990         struct smb2_read_plain_req *req = NULL;
2991         struct smb2_sync_hdr *shdr;
2992         struct TCP_Server_Info *server;
2993
2994         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2995                                  total_len);
2996         if (rc)
2997                 return rc;
2998
2999         server = io_parms->tcon->ses->server;
3000         if (server == NULL)
3001                 return -ECONNABORTED;
3002
3003         shdr = &req->sync_hdr;
3004         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3005
3006         req->PersistentFileId = io_parms->persistent_fid;
3007         req->VolatileFileId = io_parms->volatile_fid;
3008         req->ReadChannelInfoOffset = 0; /* reserved */
3009         req->ReadChannelInfoLength = 0; /* reserved */
3010         req->Channel = 0; /* reserved */
3011         req->MinimumCount = 0;
3012         req->Length = cpu_to_le32(io_parms->length);
3013         req->Offset = cpu_to_le64(io_parms->offset);
3014 #ifdef CONFIG_CIFS_SMB_DIRECT
3015         /*
3016          * If we want to do a RDMA write, fill in and append
3017          * smbd_buffer_descriptor_v1 to the end of read request
3018          */
3019         if (server->rdma && rdata && !server->sign &&
3020                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3021
3022                 struct smbd_buffer_descriptor_v1 *v1;
3023                 bool need_invalidate =
3024                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3025
3026                 rdata->mr = smbd_register_mr(
3027                                 server->smbd_conn, rdata->pages,
3028                                 rdata->nr_pages, rdata->page_offset,
3029                                 rdata->tailsz, true, need_invalidate);
3030                 if (!rdata->mr)
3031                         return -ENOBUFS;
3032
3033                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3034                 if (need_invalidate)
3035                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3036                 req->ReadChannelInfoOffset =
3037                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3038                 req->ReadChannelInfoLength =
3039                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3040                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3041                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3042                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3043                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3044
3045                 *total_len += sizeof(*v1) - 1;
3046         }
3047 #endif
3048         if (request_type & CHAINED_REQUEST) {
3049                 if (!(request_type & END_OF_CHAIN)) {
3050                         /* next 8-byte aligned request */
3051                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3052                         shdr->NextCommand = cpu_to_le32(*total_len);
3053                 } else /* END_OF_CHAIN */
3054                         shdr->NextCommand = 0;
3055                 if (request_type & RELATED_REQUEST) {
3056                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3057                         /*
3058                          * Related requests use info from previous read request
3059                          * in chain.
3060                          */
3061                         shdr->SessionId = 0xFFFFFFFF;
3062                         shdr->TreeId = 0xFFFFFFFF;
3063                         req->PersistentFileId = 0xFFFFFFFF;
3064                         req->VolatileFileId = 0xFFFFFFFF;
3065                 }
3066         }
3067         if (remaining_bytes > io_parms->length)
3068                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3069         else
3070                 req->RemainingBytes = 0;
3071
3072         *buf = req;
3073         return rc;
3074 }
3075
3076 static void
3077 smb2_readv_callback(struct mid_q_entry *mid)
3078 {
3079         struct cifs_readdata *rdata = mid->callback_data;
3080         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3081         struct TCP_Server_Info *server = tcon->ses->server;
3082         struct smb2_sync_hdr *shdr =
3083                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3084         unsigned int credits_received = 1;
3085         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3086                                  .rq_nvec = 2,
3087                                  .rq_pages = rdata->pages,
3088                                  .rq_offset = rdata->page_offset,
3089                                  .rq_npages = rdata->nr_pages,
3090                                  .rq_pagesz = rdata->pagesz,
3091                                  .rq_tailsz = rdata->tailsz };
3092
3093         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3094                  __func__, mid->mid, mid->mid_state, rdata->result,
3095                  rdata->bytes);
3096
3097         switch (mid->mid_state) {
3098         case MID_RESPONSE_RECEIVED:
3099                 credits_received = le16_to_cpu(shdr->CreditRequest);
3100                 /* result already set, check signature */
3101                 if (server->sign && !mid->decrypted) {
3102                         int rc;
3103
3104                         rc = smb2_verify_signature(&rqst, server);
3105                         if (rc)
3106                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3107                                          rc);
3108                 }
3109                 /* FIXME: should this be counted toward the initiating task? */
3110                 task_io_account_read(rdata->got_bytes);
3111                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3112                 break;
3113         case MID_REQUEST_SUBMITTED:
3114         case MID_RETRY_NEEDED:
3115                 rdata->result = -EAGAIN;
3116                 if (server->sign && rdata->got_bytes)
3117                         /* reset bytes number since we can not check a sign */
3118                         rdata->got_bytes = 0;
3119                 /* FIXME: should this be counted toward the initiating task? */
3120                 task_io_account_read(rdata->got_bytes);
3121                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3122                 break;
3123         default:
3124                 if (rdata->result != -ENODATA)
3125                         rdata->result = -EIO;
3126         }
3127 #ifdef CONFIG_CIFS_SMB_DIRECT
3128         /*
3129          * If this rdata has a memmory registered, the MR can be freed
3130          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3131          * because they have limited number and are used for future I/Os
3132          */
3133         if (rdata->mr) {
3134                 smbd_deregister_mr(rdata->mr);
3135                 rdata->mr = NULL;
3136         }
3137 #endif
3138         if (rdata->result)
3139                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3140
3141         queue_work(cifsiod_wq, &rdata->work);
3142         DeleteMidQEntry(mid);
3143         add_credits(server, credits_received, 0);
3144 }
3145
3146 /* smb2_async_readv - send an async read, and set up mid to handle result */
3147 int
3148 smb2_async_readv(struct cifs_readdata *rdata)
3149 {
3150         int rc, flags = 0;
3151         char *buf;
3152         struct smb2_sync_hdr *shdr;
3153         struct cifs_io_parms io_parms;
3154         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3155                                  .rq_nvec = 1 };
3156         struct TCP_Server_Info *server;
3157         unsigned int total_len;
3158
3159         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3160                  __func__, rdata->offset, rdata->bytes);
3161
3162         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3163         io_parms.offset = rdata->offset;
3164         io_parms.length = rdata->bytes;
3165         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3166         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3167         io_parms.pid = rdata->pid;
3168
3169         server = io_parms.tcon->ses->server;
3170
3171         rc = smb2_new_read_req(
3172                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3173         if (rc) {
3174                 if (rc == -EAGAIN && rdata->credits) {
3175                         /* credits was reset by reconnect */
3176                         rdata->credits = 0;
3177                         /* reduce in_flight value since we won't send the req */
3178                         spin_lock(&server->req_lock);
3179                         server->in_flight--;
3180                         spin_unlock(&server->req_lock);
3181                 }
3182                 return rc;
3183         }
3184
3185         if (smb3_encryption_required(io_parms.tcon))
3186                 flags |= CIFS_TRANSFORM_REQ;
3187
3188         rdata->iov[0].iov_base = buf;
3189         rdata->iov[0].iov_len = total_len;
3190
3191         shdr = (struct smb2_sync_hdr *)buf;
3192
3193         if (rdata->credits) {
3194                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3195                                                 SMB2_MAX_BUFFER_SIZE));
3196                 shdr->CreditRequest = shdr->CreditCharge;
3197                 spin_lock(&server->req_lock);
3198                 server->credits += rdata->credits -
3199                                                 le16_to_cpu(shdr->CreditCharge);
3200                 spin_unlock(&server->req_lock);
3201                 wake_up(&server->request_q);
3202                 flags |= CIFS_HAS_CREDITS;
3203         }
3204
3205         kref_get(&rdata->refcount);
3206         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3207                              cifs_readv_receive, smb2_readv_callback,
3208                              smb3_handle_read_data, rdata, flags);
3209         if (rc) {
3210                 kref_put(&rdata->refcount, cifs_readdata_release);
3211                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3212                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3213                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3214                                    io_parms.offset, io_parms.length);
3215         } else
3216                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3217                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3218                                    io_parms.offset, io_parms.length);
3219
3220         cifs_small_buf_release(buf);
3221         return rc;
3222 }
3223
3224 int
3225 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3226           unsigned int *nbytes, char **buf, int *buf_type)
3227 {
3228         struct smb_rqst rqst;
3229         int resp_buftype, rc = -EACCES;
3230         struct smb2_read_plain_req *req = NULL;
3231         struct smb2_read_rsp *rsp = NULL;
3232         struct kvec iov[1];
3233         struct kvec rsp_iov;
3234         unsigned int total_len;
3235         int flags = CIFS_LOG_ERROR;
3236         struct cifs_ses *ses = io_parms->tcon->ses;
3237
3238         *nbytes = 0;
3239         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3240         if (rc)
3241                 return rc;
3242
3243         if (smb3_encryption_required(io_parms->tcon))
3244                 flags |= CIFS_TRANSFORM_REQ;
3245
3246         iov[0].iov_base = (char *)req;
3247         iov[0].iov_len = total_len;
3248
3249         memset(&rqst, 0, sizeof(struct smb_rqst));
3250         rqst.rq_iov = iov;
3251         rqst.rq_nvec = 1;
3252
3253         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3254         cifs_small_buf_release(req);
3255
3256         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3257
3258         if (rc) {
3259                 if (rc != -ENODATA) {
3260                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3261                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3262                 }
3263                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3264                                     io_parms->tcon->tid, ses->Suid,
3265                                     io_parms->offset, io_parms->length);
3266                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3267                 return rc == -ENODATA ? 0 : rc;
3268         } else
3269                 trace_smb3_read_done(xid, req->PersistentFileId,
3270                                     io_parms->tcon->tid, ses->Suid,
3271                                     io_parms->offset, io_parms->length);
3272
3273         *nbytes = le32_to_cpu(rsp->DataLength);
3274         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3275             (*nbytes > io_parms->length)) {
3276                 cifs_dbg(FYI, "bad length %d for count %d\n",
3277                          *nbytes, io_parms->length);
3278                 rc = -EIO;
3279                 *nbytes = 0;
3280         }
3281
3282         if (*buf) {
3283                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3284                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3285         } else if (resp_buftype != CIFS_NO_BUFFER) {
3286                 *buf = rsp_iov.iov_base;
3287                 if (resp_buftype == CIFS_SMALL_BUFFER)
3288                         *buf_type = CIFS_SMALL_BUFFER;
3289                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3290                         *buf_type = CIFS_LARGE_BUFFER;
3291         }
3292         return rc;
3293 }
3294
3295 /*
3296  * Check the mid_state and signature on received buffer (if any), and queue the
3297  * workqueue completion task.
3298  */
3299 static void
3300 smb2_writev_callback(struct mid_q_entry *mid)
3301 {
3302         struct cifs_writedata *wdata = mid->callback_data;
3303         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3304         unsigned int written;
3305         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3306         unsigned int credits_received = 1;
3307
3308         switch (mid->mid_state) {
3309         case MID_RESPONSE_RECEIVED:
3310                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3311                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3312                 if (wdata->result != 0)
3313                         break;
3314
3315                 written = le32_to_cpu(rsp->DataLength);
3316                 /*
3317                  * Mask off high 16 bits when bytes written as returned
3318                  * by the server is greater than bytes requested by the
3319                  * client. OS/2 servers are known to set incorrect
3320                  * CountHigh values.
3321                  */
3322                 if (written > wdata->bytes)
3323                         written &= 0xFFFF;
3324
3325                 if (written < wdata->bytes)
3326                         wdata->result = -ENOSPC;
3327                 else
3328                         wdata->bytes = written;
3329                 break;
3330         case MID_REQUEST_SUBMITTED:
3331         case MID_RETRY_NEEDED:
3332                 wdata->result = -EAGAIN;
3333                 break;
3334         default:
3335                 wdata->result = -EIO;
3336                 break;
3337         }
3338 #ifdef CONFIG_CIFS_SMB_DIRECT
3339         /*
3340          * If this wdata has a memory registered, the MR can be freed
3341          * The number of MRs available is limited, it's important to recover
3342          * used MR as soon as I/O is finished. Hold MR longer in the later
3343          * I/O process can possibly result in I/O deadlock due to lack of MR
3344          * to send request on I/O retry
3345          */
3346         if (wdata->mr) {
3347                 smbd_deregister_mr(wdata->mr);
3348                 wdata->mr = NULL;
3349         }
3350 #endif
3351         if (wdata->result)
3352                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3353
3354         queue_work(cifsiod_wq, &wdata->work);
3355         DeleteMidQEntry(mid);
3356         add_credits(tcon->ses->server, credits_received, 0);
3357 }
3358
3359 /* smb2_async_writev - send an async write, and set up mid to handle result */
3360 int
3361 smb2_async_writev(struct cifs_writedata *wdata,
3362                   void (*release)(struct kref *kref))
3363 {
3364         int rc = -EACCES, flags = 0;
3365         struct smb2_write_req *req = NULL;
3366         struct smb2_sync_hdr *shdr;
3367         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3368         struct TCP_Server_Info *server = tcon->ses->server;
3369         struct kvec iov[1];
3370         struct smb_rqst rqst = { };
3371         unsigned int total_len;
3372
3373         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3374         if (rc) {
3375                 if (rc == -EAGAIN && wdata->credits) {
3376                         /* credits was reset by reconnect */
3377                         wdata->credits = 0;
3378                         /* reduce in_flight value since we won't send the req */
3379                         spin_lock(&server->req_lock);
3380                         server->in_flight--;
3381                         spin_unlock(&server->req_lock);
3382                 }
3383                 goto async_writev_out;
3384         }
3385
3386         if (smb3_encryption_required(tcon))
3387                 flags |= CIFS_TRANSFORM_REQ;
3388
3389         shdr = (struct smb2_sync_hdr *)req;
3390         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3391
3392         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3393         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3394         req->WriteChannelInfoOffset = 0;
3395         req->WriteChannelInfoLength = 0;
3396         req->Channel = 0;
3397         req->Offset = cpu_to_le64(wdata->offset);
3398         req->DataOffset = cpu_to_le16(
3399                                 offsetof(struct smb2_write_req, Buffer));
3400         req->RemainingBytes = 0;
3401 #ifdef CONFIG_CIFS_SMB_DIRECT
3402         /*
3403          * If we want to do a server RDMA read, fill in and append
3404          * smbd_buffer_descriptor_v1 to the end of write request
3405          */
3406         if (server->rdma && !server->sign && wdata->bytes >=
3407                 server->smbd_conn->rdma_readwrite_threshold) {
3408
3409                 struct smbd_buffer_descriptor_v1 *v1;
3410                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3411
3412                 wdata->mr = smbd_register_mr(
3413                                 server->smbd_conn, wdata->pages,
3414                                 wdata->nr_pages, wdata->page_offset,
3415                                 wdata->tailsz, false, need_invalidate);
3416                 if (!wdata->mr) {
3417                         rc = -ENOBUFS;
3418                         goto async_writev_out;
3419                 }
3420                 req->Length = 0;
3421                 req->DataOffset = 0;
3422                 if (wdata->nr_pages > 1)
3423                         req->RemainingBytes =
3424                                 cpu_to_le32(
3425                                         (wdata->nr_pages - 1) * wdata->pagesz -
3426                                         wdata->page_offset + wdata->tailsz
3427                                 );
3428                 else
3429                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3430                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3431                 if (need_invalidate)
3432                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3433                 req->WriteChannelInfoOffset =
3434                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3435                 req->WriteChannelInfoLength =
3436                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3437                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3438                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3439                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3440                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3441         }
3442 #endif
3443         iov[0].iov_len = total_len - 1;