a92d3840db9d5273ff2978eac326fd5e0bc36f67
[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         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1516         if (rc != 0) {
1517                 if (tcon) {
1518                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519                         tcon->need_reconnect = true;
1520                 }
1521                 goto tcon_error_exit;
1522         }
1523
1524         switch (rsp->ShareType) {
1525         case SMB2_SHARE_TYPE_DISK:
1526                 cifs_dbg(FYI, "connection to disk share\n");
1527                 break;
1528         case SMB2_SHARE_TYPE_PIPE:
1529                 tcon->pipe = true;
1530                 cifs_dbg(FYI, "connection to pipe share\n");
1531                 break;
1532         case SMB2_SHARE_TYPE_PRINT:
1533                 tcon->print = true;
1534                 cifs_dbg(FYI, "connection to printer\n");
1535                 break;
1536         default:
1537                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538                 rc = -EOPNOTSUPP;
1539                 goto tcon_error_exit;
1540         }
1541
1542         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545         tcon->tidStatus = CifsGood;
1546         tcon->need_reconnect = false;
1547         tcon->tid = rsp->sync_hdr.TreeId;
1548         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549
1550         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553
1554         if (tcon->seal &&
1555             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557
1558         init_copy_chunk_defaults(tcon);
1559         if (tcon->ses->server->ops->validate_negotiate)
1560                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561 tcon_exit:
1562
1563         free_rsp_buf(resp_buftype, rsp);
1564         kfree(unc_path);
1565         return rc;
1566
1567 tcon_error_exit:
1568         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1569                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1570         }
1571         goto tcon_exit;
1572 }
1573
1574 int
1575 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1576 {
1577         struct smb_rqst rqst;
1578         struct smb2_tree_disconnect_req *req; /* response is trivial */
1579         int rc = 0;
1580         struct cifs_ses *ses = tcon->ses;
1581         int flags = 0;
1582         unsigned int total_len;
1583         struct kvec iov[1];
1584         struct kvec rsp_iov;
1585         int resp_buf_type;
1586
1587         cifs_dbg(FYI, "Tree Disconnect\n");
1588
1589         if (!ses || !(ses->server))
1590                 return -EIO;
1591
1592         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1593                 return 0;
1594
1595         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1596                              &total_len);
1597         if (rc)
1598                 return rc;
1599
1600         if (smb3_encryption_required(tcon))
1601                 flags |= CIFS_TRANSFORM_REQ;
1602
1603         flags |= CIFS_NO_RESP;
1604
1605         iov[0].iov_base = (char *)req;
1606         iov[0].iov_len = total_len;
1607
1608         memset(&rqst, 0, sizeof(struct smb_rqst));
1609         rqst.rq_iov = iov;
1610         rqst.rq_nvec = 1;
1611
1612         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1613         cifs_small_buf_release(req);
1614         if (rc)
1615                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1616
1617         return rc;
1618 }
1619
1620
1621 static struct create_durable *
1622 create_durable_buf(void)
1623 {
1624         struct create_durable *buf;
1625
1626         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1627         if (!buf)
1628                 return NULL;
1629
1630         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1631                                         (struct create_durable, Data));
1632         buf->ccontext.DataLength = cpu_to_le32(16);
1633         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1634                                 (struct create_durable, Name));
1635         buf->ccontext.NameLength = cpu_to_le16(4);
1636         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1637         buf->Name[0] = 'D';
1638         buf->Name[1] = 'H';
1639         buf->Name[2] = 'n';
1640         buf->Name[3] = 'Q';
1641         return buf;
1642 }
1643
1644 static struct create_durable *
1645 create_reconnect_durable_buf(struct cifs_fid *fid)
1646 {
1647         struct create_durable *buf;
1648
1649         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1650         if (!buf)
1651                 return NULL;
1652
1653         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1654                                         (struct create_durable, Data));
1655         buf->ccontext.DataLength = cpu_to_le32(16);
1656         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1657                                 (struct create_durable, Name));
1658         buf->ccontext.NameLength = cpu_to_le16(4);
1659         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1660         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1661         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1662         buf->Name[0] = 'D';
1663         buf->Name[1] = 'H';
1664         buf->Name[2] = 'n';
1665         buf->Name[3] = 'C';
1666         return buf;
1667 }
1668
1669 static __u8
1670 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1671                   unsigned int *epoch, char *lease_key)
1672 {
1673         char *data_offset;
1674         struct create_context *cc;
1675         unsigned int next;
1676         unsigned int remaining;
1677         char *name;
1678
1679         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1680         remaining = le32_to_cpu(rsp->CreateContextsLength);
1681         cc = (struct create_context *)data_offset;
1682         while (remaining >= sizeof(struct create_context)) {
1683                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1684                 if (le16_to_cpu(cc->NameLength) == 4 &&
1685                     strncmp(name, "RqLs", 4) == 0)
1686                         return server->ops->parse_lease_buf(cc, epoch,
1687                                                             lease_key);
1688
1689                 next = le32_to_cpu(cc->Next);
1690                 if (!next)
1691                         break;
1692                 remaining -= next;
1693                 cc = (struct create_context *)((char *)cc + next);
1694         }
1695
1696         return 0;
1697 }
1698
1699 static int
1700 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1701                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1702 {
1703         struct smb2_create_req *req = iov[0].iov_base;
1704         unsigned int num = *num_iovec;
1705
1706         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1707         if (iov[num].iov_base == NULL)
1708                 return -ENOMEM;
1709         iov[num].iov_len = server->vals->create_lease_size;
1710         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1711         if (!req->CreateContextsOffset)
1712                 req->CreateContextsOffset = cpu_to_le32(
1713                                 sizeof(struct smb2_create_req) +
1714                                 iov[num - 1].iov_len);
1715         le32_add_cpu(&req->CreateContextsLength,
1716                      server->vals->create_lease_size);
1717         *num_iovec = num + 1;
1718         return 0;
1719 }
1720
1721 static struct create_durable_v2 *
1722 create_durable_v2_buf(struct cifs_fid *pfid)
1723 {
1724         struct create_durable_v2 *buf;
1725
1726         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1727         if (!buf)
1728                 return NULL;
1729
1730         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1731                                         (struct create_durable_v2, dcontext));
1732         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1733         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1734                                 (struct create_durable_v2, Name));
1735         buf->ccontext.NameLength = cpu_to_le16(4);
1736
1737         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1738         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1739         generate_random_uuid(buf->dcontext.CreateGuid);
1740         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1741
1742         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1743         buf->Name[0] = 'D';
1744         buf->Name[1] = 'H';
1745         buf->Name[2] = '2';
1746         buf->Name[3] = 'Q';
1747         return buf;
1748 }
1749
1750 static struct create_durable_handle_reconnect_v2 *
1751 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1752 {
1753         struct create_durable_handle_reconnect_v2 *buf;
1754
1755         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1756                         GFP_KERNEL);
1757         if (!buf)
1758                 return NULL;
1759
1760         buf->ccontext.DataOffset =
1761                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1762                                      dcontext));
1763         buf->ccontext.DataLength =
1764                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1765         buf->ccontext.NameOffset =
1766                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1767                             Name));
1768         buf->ccontext.NameLength = cpu_to_le16(4);
1769
1770         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1771         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1772         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1773         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1774
1775         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1776         buf->Name[0] = 'D';
1777         buf->Name[1] = 'H';
1778         buf->Name[2] = '2';
1779         buf->Name[3] = 'C';
1780         return buf;
1781 }
1782
1783 static int
1784 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1785                     struct cifs_open_parms *oparms)
1786 {
1787         struct smb2_create_req *req = iov[0].iov_base;
1788         unsigned int num = *num_iovec;
1789
1790         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1791         if (iov[num].iov_base == NULL)
1792                 return -ENOMEM;
1793         iov[num].iov_len = sizeof(struct create_durable_v2);
1794         if (!req->CreateContextsOffset)
1795                 req->CreateContextsOffset =
1796                         cpu_to_le32(sizeof(struct smb2_create_req) +
1797                                                                 iov[1].iov_len);
1798         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1799         *num_iovec = num + 1;
1800         return 0;
1801 }
1802
1803 static int
1804 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1805                     struct cifs_open_parms *oparms)
1806 {
1807         struct smb2_create_req *req = iov[0].iov_base;
1808         unsigned int num = *num_iovec;
1809
1810         /* indicate that we don't need to relock the file */
1811         oparms->reconnect = false;
1812
1813         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1814         if (iov[num].iov_base == NULL)
1815                 return -ENOMEM;
1816         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1817         if (!req->CreateContextsOffset)
1818                 req->CreateContextsOffset =
1819                         cpu_to_le32(sizeof(struct smb2_create_req) +
1820                                                                 iov[1].iov_len);
1821         le32_add_cpu(&req->CreateContextsLength,
1822                         sizeof(struct create_durable_handle_reconnect_v2));
1823         *num_iovec = num + 1;
1824         return 0;
1825 }
1826
1827 static int
1828 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1829                     struct cifs_open_parms *oparms, bool use_persistent)
1830 {
1831         struct smb2_create_req *req = iov[0].iov_base;
1832         unsigned int num = *num_iovec;
1833
1834         if (use_persistent) {
1835                 if (oparms->reconnect)
1836                         return add_durable_reconnect_v2_context(iov, num_iovec,
1837                                                                 oparms);
1838                 else
1839                         return add_durable_v2_context(iov, num_iovec, oparms);
1840         }
1841
1842         if (oparms->reconnect) {
1843                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1844                 /* indicate that we don't need to relock the file */
1845                 oparms->reconnect = false;
1846         } else
1847                 iov[num].iov_base = create_durable_buf();
1848         if (iov[num].iov_base == NULL)
1849                 return -ENOMEM;
1850         iov[num].iov_len = sizeof(struct create_durable);
1851         if (!req->CreateContextsOffset)
1852                 req->CreateContextsOffset =
1853                         cpu_to_le32(sizeof(struct smb2_create_req) +
1854                                                                 iov[1].iov_len);
1855         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1856         *num_iovec = num + 1;
1857         return 0;
1858 }
1859
1860 /* See MS-SMB2 2.2.13.2.7 */
1861 static struct crt_twarp_ctxt *
1862 create_twarp_buf(__u64 timewarp)
1863 {
1864         struct crt_twarp_ctxt *buf;
1865
1866         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1867         if (!buf)
1868                 return NULL;
1869
1870         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1871                                         (struct crt_twarp_ctxt, Timestamp));
1872         buf->ccontext.DataLength = cpu_to_le32(8);
1873         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1874                                 (struct crt_twarp_ctxt, Name));
1875         buf->ccontext.NameLength = cpu_to_le16(4);
1876         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1877         buf->Name[0] = 'T';
1878         buf->Name[1] = 'W';
1879         buf->Name[2] = 'r';
1880         buf->Name[3] = 'p';
1881         buf->Timestamp = cpu_to_le64(timewarp);
1882         return buf;
1883 }
1884
1885 /* See MS-SMB2 2.2.13.2.7 */
1886 static int
1887 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1888 {
1889         struct smb2_create_req *req = iov[0].iov_base;
1890         unsigned int num = *num_iovec;
1891
1892         iov[num].iov_base = create_twarp_buf(timewarp);
1893         if (iov[num].iov_base == NULL)
1894                 return -ENOMEM;
1895         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1896         if (!req->CreateContextsOffset)
1897                 req->CreateContextsOffset = cpu_to_le32(
1898                                 sizeof(struct smb2_create_req) +
1899                                 iov[num - 1].iov_len);
1900         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1901         *num_iovec = num + 1;
1902         return 0;
1903 }
1904
1905 static int
1906 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1907                             const char *treename, const __le16 *path)
1908 {
1909         int treename_len, path_len;
1910         struct nls_table *cp;
1911         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1912
1913         /*
1914          * skip leading "\\"
1915          */
1916         treename_len = strlen(treename);
1917         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1918                 return -EINVAL;
1919
1920         treename += 2;
1921         treename_len -= 2;
1922
1923         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1924
1925         /*
1926          * make room for one path separator between the treename and
1927          * path
1928          */
1929         *out_len = treename_len + 1 + path_len;
1930
1931         /*
1932          * final path needs to be null-terminated UTF16 with a
1933          * size aligned to 8
1934          */
1935
1936         *out_size = roundup((*out_len+1)*2, 8);
1937         *out_path = kzalloc(*out_size, GFP_KERNEL);
1938         if (!*out_path)
1939                 return -ENOMEM;
1940
1941         cp = load_nls_default();
1942         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1943         UniStrcat(*out_path, sep);
1944         UniStrcat(*out_path, path);
1945         unload_nls(cp);
1946
1947         return 0;
1948 }
1949
1950 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1951                                umode_t mode, struct cifs_tcon *tcon,
1952                                const char *full_path,
1953                                struct cifs_sb_info *cifs_sb)
1954 {
1955         struct smb_rqst rqst;
1956         struct smb2_create_req *req;
1957         struct smb2_create_rsp *rsp = NULL;
1958         struct TCP_Server_Info *server;
1959         struct cifs_ses *ses = tcon->ses;
1960         struct kvec iov[3]; /* make sure at least one for each open context */
1961         struct kvec rsp_iov = {NULL, 0};
1962         int resp_buftype;
1963         int uni_path_len;
1964         __le16 *copy_path = NULL;
1965         int copy_size;
1966         int rc = 0;
1967         unsigned int n_iov = 2;
1968         __u32 file_attributes = 0;
1969         char *pc_buf = NULL;
1970         int flags = 0;
1971         unsigned int total_len;
1972         __le16 *utf16_path = NULL;
1973
1974         cifs_dbg(FYI, "mkdir\n");
1975
1976         /* resource #1: path allocation */
1977         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1978         if (!utf16_path)
1979                 return -ENOMEM;
1980
1981         if (ses && (ses->server))
1982                 server = ses->server;
1983         else {
1984                 rc = -EIO;
1985                 goto err_free_path;
1986         }
1987
1988         /* resource #2: request */
1989         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1990         if (rc)
1991                 goto err_free_path;
1992
1993
1994         if (smb3_encryption_required(tcon))
1995                 flags |= CIFS_TRANSFORM_REQ;
1996
1997         req->ImpersonationLevel = IL_IMPERSONATION;
1998         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1999         /* File attributes ignored on open (used in create though) */
2000         req->FileAttributes = cpu_to_le32(file_attributes);
2001         req->ShareAccess = FILE_SHARE_ALL_LE;
2002         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2003         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2004
2005         iov[0].iov_base = (char *)req;
2006         /* -1 since last byte is buf[0] which is sent below (path) */
2007         iov[0].iov_len = total_len - 1;
2008
2009         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2010
2011         /* [MS-SMB2] 2.2.13 NameOffset:
2012          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2013          * the SMB2 header, the file name includes a prefix that will
2014          * be processed during DFS name normalization as specified in
2015          * section 3.3.5.9. Otherwise, the file name is relative to
2016          * the share that is identified by the TreeId in the SMB2
2017          * header.
2018          */
2019         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2020                 int name_len;
2021
2022                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2023                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2024                                                  &name_len,
2025                                                  tcon->treeName, utf16_path);
2026                 if (rc)
2027                         goto err_free_req;
2028
2029                 req->NameLength = cpu_to_le16(name_len * 2);
2030                 uni_path_len = copy_size;
2031                 /* free before overwriting resource */
2032                 kfree(utf16_path);
2033                 utf16_path = copy_path;
2034         } else {
2035                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2036                 /* MUST set path len (NameLength) to 0 opening root of share */
2037                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2038                 if (uni_path_len % 8 != 0) {
2039                         copy_size = roundup(uni_path_len, 8);
2040                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2041                         if (!copy_path) {
2042                                 rc = -ENOMEM;
2043                                 goto err_free_req;
2044                         }
2045                         memcpy((char *)copy_path, (const char *)utf16_path,
2046                                uni_path_len);
2047                         uni_path_len = copy_size;
2048                         /* free before overwriting resource */
2049                         kfree(utf16_path);
2050                         utf16_path = copy_path;
2051                 }
2052         }
2053
2054         iov[1].iov_len = uni_path_len;
2055         iov[1].iov_base = utf16_path;
2056         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2057
2058         if (tcon->posix_extensions) {
2059                 /* resource #3: posix buf */
2060                 rc = add_posix_context(iov, &n_iov, mode);
2061                 if (rc)
2062                         goto err_free_req;
2063                 pc_buf = iov[n_iov-1].iov_base;
2064         }
2065
2066
2067         memset(&rqst, 0, sizeof(struct smb_rqst));
2068         rqst.rq_iov = iov;
2069         rqst.rq_nvec = n_iov;
2070
2071         /* resource #4: response buffer */
2072         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2073         if (rc) {
2074                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2075                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2076                                            CREATE_NOT_FILE,
2077                                            FILE_WRITE_ATTRIBUTES, rc);
2078                 goto err_free_rsp_buf;
2079         }
2080
2081         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2082         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2083                                     ses->Suid, CREATE_NOT_FILE,
2084                                     FILE_WRITE_ATTRIBUTES);
2085
2086         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2087
2088         /* Eventually save off posix specific response info and timestaps */
2089
2090 err_free_rsp_buf:
2091         free_rsp_buf(resp_buftype, rsp);
2092         kfree(pc_buf);
2093 err_free_req:
2094         cifs_small_buf_release(req);
2095 err_free_path:
2096         kfree(utf16_path);
2097         return rc;
2098 }
2099
2100 int
2101 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2102                struct cifs_open_parms *oparms, __le16 *path)
2103 {
2104         struct TCP_Server_Info *server = tcon->ses->server;
2105         struct smb2_create_req *req;
2106         unsigned int n_iov = 2;
2107         __u32 file_attributes = 0;
2108         int copy_size;
2109         int uni_path_len;
2110         unsigned int total_len;
2111         struct kvec *iov = rqst->rq_iov;
2112         __le16 *copy_path;
2113         int rc;
2114
2115         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2116         if (rc)
2117                 return rc;
2118
2119         iov[0].iov_base = (char *)req;
2120         /* -1 since last byte is buf[0] which is sent below (path) */
2121         iov[0].iov_len = total_len - 1;
2122
2123         if (oparms->create_options & CREATE_OPTION_READONLY)
2124                 file_attributes |= ATTR_READONLY;
2125         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2126                 file_attributes |= ATTR_SYSTEM;
2127
2128         req->ImpersonationLevel = IL_IMPERSONATION;
2129         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2130         /* File attributes ignored on open (used in create though) */
2131         req->FileAttributes = cpu_to_le32(file_attributes);
2132         req->ShareAccess = FILE_SHARE_ALL_LE;
2133         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2134         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2135         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2136
2137         /* [MS-SMB2] 2.2.13 NameOffset:
2138          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2139          * the SMB2 header, the file name includes a prefix that will
2140          * be processed during DFS name normalization as specified in
2141          * section 3.3.5.9. Otherwise, the file name is relative to
2142          * the share that is identified by the TreeId in the SMB2
2143          * header.
2144          */
2145         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2146                 int name_len;
2147
2148                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2149                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2150                                                  &name_len,
2151                                                  tcon->treeName, path);
2152                 if (rc)
2153                         return rc;
2154                 req->NameLength = cpu_to_le16(name_len * 2);
2155                 uni_path_len = copy_size;
2156                 path = copy_path;
2157         } else {
2158                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2159                 /* MUST set path len (NameLength) to 0 opening root of share */
2160                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2161                 copy_size = uni_path_len;
2162                 if (copy_size % 8 != 0)
2163                         copy_size = roundup(copy_size, 8);
2164                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2165                 if (!copy_path)
2166                         return -ENOMEM;
2167                 memcpy((char *)copy_path, (const char *)path,
2168                        uni_path_len);
2169                 uni_path_len = copy_size;
2170                 path = copy_path;
2171         }
2172
2173         iov[1].iov_len = uni_path_len;
2174         iov[1].iov_base = path;
2175
2176         if (!server->oplocks)
2177                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2178
2179         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2180             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2181                 req->RequestedOplockLevel = *oplock;
2182         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2183                   (oparms->create_options & CREATE_NOT_FILE))
2184                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2185         else {
2186                 rc = add_lease_context(server, iov, &n_iov,
2187                                        oparms->fid->lease_key, oplock);
2188                 if (rc)
2189                         return rc;
2190         }
2191
2192         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2193                 /* need to set Next field of lease context if we request it */
2194                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2195                         struct create_context *ccontext =
2196                             (struct create_context *)iov[n_iov-1].iov_base;
2197                         ccontext->Next =
2198                                 cpu_to_le32(server->vals->create_lease_size);
2199                 }
2200
2201                 rc = add_durable_context(iov, &n_iov, oparms,
2202                                         tcon->use_persistent);
2203                 if (rc)
2204                         return rc;
2205         }
2206
2207         if (tcon->posix_extensions) {
2208                 if (n_iov > 2) {
2209                         struct create_context *ccontext =
2210                             (struct create_context *)iov[n_iov-1].iov_base;
2211                         ccontext->Next =
2212                                 cpu_to_le32(iov[n_iov-1].iov_len);
2213                 }
2214
2215                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2216                 if (rc)
2217                         return rc;
2218         }
2219
2220         if (tcon->snapshot_time) {
2221                 cifs_dbg(FYI, "adding snapshot context\n");
2222                 if (n_iov > 2) {
2223                         struct create_context *ccontext =
2224                             (struct create_context *)iov[n_iov-1].iov_base;
2225                         ccontext->Next =
2226                                 cpu_to_le32(iov[n_iov-1].iov_len);
2227                 }
2228
2229                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2230                 if (rc)
2231                         return rc;
2232         }
2233
2234
2235         rqst->rq_nvec = n_iov;
2236         return 0;
2237 }
2238
2239 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2240  * All other vectors are freed by kfree().
2241  */
2242 void
2243 SMB2_open_free(struct smb_rqst *rqst)
2244 {
2245         int i;
2246
2247         if (rqst && rqst->rq_iov) {
2248                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2249                 for (i = 1; i < rqst->rq_nvec; i++)
2250                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2251                                 kfree(rqst->rq_iov[i].iov_base);
2252         }
2253 }
2254
2255 int
2256 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2257           __u8 *oplock, struct smb2_file_all_info *buf,
2258           struct kvec *err_iov, int *buftype)
2259 {
2260         struct smb_rqst rqst;
2261         struct smb2_create_rsp *rsp = NULL;
2262         struct TCP_Server_Info *server;
2263         struct cifs_tcon *tcon = oparms->tcon;
2264         struct cifs_ses *ses = tcon->ses;
2265         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2266         struct kvec rsp_iov = {NULL, 0};
2267         int resp_buftype = CIFS_NO_BUFFER;
2268         int rc = 0;
2269         int flags = 0;
2270
2271         cifs_dbg(FYI, "create/open\n");
2272         if (ses && (ses->server))
2273                 server = ses->server;
2274         else
2275                 return -EIO;
2276
2277         if (smb3_encryption_required(tcon))
2278                 flags |= CIFS_TRANSFORM_REQ;
2279
2280         memset(&rqst, 0, sizeof(struct smb_rqst));
2281         memset(&iov, 0, sizeof(iov));
2282         rqst.rq_iov = iov;
2283         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2284
2285         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2286         if (rc)
2287                 goto creat_exit;
2288
2289         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2290                             &rsp_iov);
2291         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2292
2293         if (rc != 0) {
2294                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2295                 if (err_iov && rsp) {
2296                         *err_iov = rsp_iov;
2297                         *buftype = resp_buftype;
2298                         resp_buftype = CIFS_NO_BUFFER;
2299                         rsp = NULL;
2300                 }
2301                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2302                                     oparms->create_options, oparms->desired_access, rc);
2303                 goto creat_exit;
2304         } else
2305                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2306                                      ses->Suid, oparms->create_options,
2307                                      oparms->desired_access);
2308
2309         atomic_inc(&tcon->num_remote_opens);
2310         oparms->fid->persistent_fid = rsp->PersistentFileId;
2311         oparms->fid->volatile_fid = rsp->VolatileFileId;
2312
2313         if (buf) {
2314                 memcpy(buf, &rsp->CreationTime, 32);
2315                 buf->AllocationSize = rsp->AllocationSize;
2316                 buf->EndOfFile = rsp->EndofFile;
2317                 buf->Attributes = rsp->FileAttributes;
2318                 buf->NumberOfLinks = cpu_to_le32(1);
2319                 buf->DeletePending = 0;
2320         }
2321
2322         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2323                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2324                                             oparms->fid->lease_key);
2325         else
2326                 *oplock = rsp->OplockLevel;
2327 creat_exit:
2328         SMB2_open_free(&rqst);
2329         free_rsp_buf(resp_buftype, rsp);
2330         return rc;
2331 }
2332
2333 /*
2334  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2335  */
2336 int
2337 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2338            u64 volatile_fid, u32 opcode, bool is_fsctl,
2339            char *in_data, u32 indatalen,
2340            char **out_data, u32 *plen /* returned data len */)
2341 {
2342         struct smb_rqst rqst;
2343         struct smb2_ioctl_req *req;
2344         struct smb2_ioctl_rsp *rsp;
2345         struct cifs_ses *ses;
2346         struct kvec iov[2];
2347         struct kvec rsp_iov;
2348         int resp_buftype;
2349         int n_iov;
2350         int rc = 0;
2351         int flags = 0;
2352         unsigned int total_len;
2353
2354         cifs_dbg(FYI, "SMB2 IOCTL\n");
2355
2356         if (out_data != NULL)
2357                 *out_data = NULL;
2358
2359         /* zero out returned data len, in case of error */
2360         if (plen)
2361                 *plen = 0;
2362
2363         if (tcon)
2364                 ses = tcon->ses;
2365         else
2366                 return -EIO;
2367
2368         if (!ses || !(ses->server))
2369                 return -EIO;
2370
2371         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2372         if (rc)
2373                 return rc;
2374
2375         if (smb3_encryption_required(tcon))
2376                 flags |= CIFS_TRANSFORM_REQ;
2377
2378         req->CtlCode = cpu_to_le32(opcode);
2379         req->PersistentFileId = persistent_fid;
2380         req->VolatileFileId = volatile_fid;
2381
2382         if (indatalen) {
2383                 req->InputCount = cpu_to_le32(indatalen);
2384                 /* do not set InputOffset if no input data */
2385                 req->InputOffset =
2386                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2387                 iov[1].iov_base = in_data;
2388                 iov[1].iov_len = indatalen;
2389                 n_iov = 2;
2390         } else
2391                 n_iov = 1;
2392
2393         req->OutputOffset = 0;
2394         req->OutputCount = 0; /* MBZ */
2395
2396         /*
2397          * Could increase MaxOutputResponse, but that would require more
2398          * than one credit. Windows typically sets this smaller, but for some
2399          * ioctls it may be useful to allow server to send more. No point
2400          * limiting what the server can send as long as fits in one credit
2401          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2402          * (by default, note that it can be overridden to make max larger)
2403          * in responses (except for read responses which can be bigger.
2404          * We may want to bump this limit up
2405          */
2406         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2407
2408         if (is_fsctl)
2409                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2410         else
2411                 req->Flags = 0;
2412
2413         iov[0].iov_base = (char *)req;
2414
2415         /*
2416          * If no input data, the size of ioctl struct in
2417          * protocol spec still includes a 1 byte data buffer,
2418          * but if input data passed to ioctl, we do not
2419          * want to double count this, so we do not send
2420          * the dummy one byte of data in iovec[0] if sending
2421          * input data (in iovec[1]).
2422          */
2423
2424         if (indatalen) {
2425                 iov[0].iov_len = total_len - 1;
2426         } else
2427                 iov[0].iov_len = total_len;
2428
2429         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2430         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2431                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2432
2433         memset(&rqst, 0, sizeof(struct smb_rqst));
2434         rqst.rq_iov = iov;
2435         rqst.rq_nvec = n_iov;
2436
2437         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2438                             &rsp_iov);
2439         cifs_small_buf_release(req);
2440         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2441
2442         if (rc != 0)
2443                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2444                                 ses->Suid, 0, opcode, rc);
2445
2446         if ((rc != 0) && (rc != -EINVAL)) {
2447                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2448                 goto ioctl_exit;
2449         } else if (rc == -EINVAL) {
2450                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2451                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2452                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2453                         goto ioctl_exit;
2454                 }
2455         }
2456
2457         /* check if caller wants to look at return data or just return rc */
2458         if ((plen == NULL) || (out_data == NULL))
2459                 goto ioctl_exit;
2460
2461         *plen = le32_to_cpu(rsp->OutputCount);
2462
2463         /* We check for obvious errors in the output buffer length and offset */
2464         if (*plen == 0)
2465                 goto ioctl_exit; /* server returned no data */
2466         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2467                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2468                 *plen = 0;
2469                 rc = -EIO;
2470                 goto ioctl_exit;
2471         }
2472
2473         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2474                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2475                         le32_to_cpu(rsp->OutputOffset));
2476                 *plen = 0;
2477                 rc = -EIO;
2478                 goto ioctl_exit;
2479         }
2480
2481         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2482                             *plen, GFP_KERNEL);
2483         if (*out_data == NULL) {
2484                 rc = -ENOMEM;
2485                 goto ioctl_exit;
2486         }
2487
2488 ioctl_exit:
2489         free_rsp_buf(resp_buftype, rsp);
2490         return rc;
2491 }
2492
2493 /*
2494  *   Individual callers to ioctl worker function follow
2495  */
2496
2497 int
2498 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2499                      u64 persistent_fid, u64 volatile_fid)
2500 {
2501         int rc;
2502         struct  compress_ioctl fsctl_input;
2503         char *ret_data = NULL;
2504
2505         fsctl_input.CompressionState =
2506                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2507
2508         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2509                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2510                         (char *)&fsctl_input /* data input */,
2511                         2 /* in data len */, &ret_data /* out data */, NULL);
2512
2513         cifs_dbg(FYI, "set compression rc %d\n", rc);
2514
2515         return rc;
2516 }
2517
2518 int
2519 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2520                 u64 persistent_fid, u64 volatile_fid)
2521 {
2522         struct smb2_close_req *req;
2523         struct kvec *iov = rqst->rq_iov;
2524         unsigned int total_len;
2525         int rc;
2526
2527         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2528         if (rc)
2529                 return rc;
2530
2531         req->PersistentFileId = persistent_fid;
2532         req->VolatileFileId = volatile_fid;
2533         iov[0].iov_base = (char *)req;
2534         iov[0].iov_len = total_len;
2535
2536         return 0;
2537 }
2538
2539 void
2540 SMB2_close_free(struct smb_rqst *rqst)
2541 {
2542         if (rqst && rqst->rq_iov)
2543                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2544 }
2545
2546 int
2547 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2548                  u64 persistent_fid, u64 volatile_fid, int flags)
2549 {
2550         struct smb_rqst rqst;
2551         struct smb2_close_rsp *rsp = NULL;
2552         struct cifs_ses *ses = tcon->ses;
2553         struct kvec iov[1];
2554         struct kvec rsp_iov;
2555         int resp_buftype = CIFS_NO_BUFFER;
2556         int rc = 0;
2557
2558         cifs_dbg(FYI, "Close\n");
2559
2560         if (!ses || !(ses->server))
2561                 return -EIO;
2562
2563         if (smb3_encryption_required(tcon))
2564                 flags |= CIFS_TRANSFORM_REQ;
2565
2566         memset(&rqst, 0, sizeof(struct smb_rqst));
2567         memset(&iov, 0, sizeof(iov));
2568         rqst.rq_iov = iov;
2569         rqst.rq_nvec = 1;
2570
2571         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2572         if (rc)
2573                 goto close_exit;
2574
2575         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2576         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2577
2578         if (rc != 0) {
2579                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2580                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2581                                      rc);
2582                 goto close_exit;
2583         }
2584
2585         atomic_dec(&tcon->num_remote_opens);
2586
2587         /* BB FIXME - decode close response, update inode for caching */
2588
2589 close_exit:
2590         SMB2_close_free(&rqst);
2591         free_rsp_buf(resp_buftype, rsp);
2592         return rc;
2593 }
2594
2595 int
2596 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2597            u64 persistent_fid, u64 volatile_fid)
2598 {
2599         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2600 }
2601
2602 int
2603 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2604                   struct kvec *iov, unsigned int min_buf_size)
2605 {
2606         unsigned int smb_len = iov->iov_len;
2607         char *end_of_smb = smb_len + (char *)iov->iov_base;
2608         char *begin_of_buf = offset + (char *)iov->iov_base;
2609         char *end_of_buf = begin_of_buf + buffer_length;
2610
2611
2612         if (buffer_length < min_buf_size) {
2613                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2614                          buffer_length, min_buf_size);
2615                 return -EINVAL;
2616         }
2617
2618         /* check if beyond RFC1001 maximum length */
2619         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2620                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2621                          buffer_length, smb_len);
2622                 return -EINVAL;
2623         }
2624
2625         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2626                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2627                 return -EINVAL;
2628         }
2629
2630         return 0;
2631 }
2632
2633 /*
2634  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2635  * Caller must free buffer.
2636  */
2637 int
2638 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2639                            struct kvec *iov, unsigned int minbufsize,
2640                            char *data)
2641 {
2642         char *begin_of_buf = offset + (char *)iov->iov_base;
2643         int rc;
2644
2645         if (!data)
2646                 return -EINVAL;
2647
2648         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2649         if (rc)
2650                 return rc;
2651
2652         memcpy(data, begin_of_buf, buffer_length);
2653
2654         return 0;
2655 }
2656
2657 int
2658 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2659                      u64 persistent_fid, u64 volatile_fid,
2660                      u8 info_class, u8 info_type, u32 additional_info,
2661                      size_t output_len, size_t input_len, void *input)
2662 {
2663         struct smb2_query_info_req *req;
2664         struct kvec *iov = rqst->rq_iov;
2665         unsigned int total_len;
2666         int rc;
2667
2668         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2669                              &total_len);
2670         if (rc)
2671                 return rc;
2672
2673         req->InfoType = info_type;
2674         req->FileInfoClass = info_class;
2675         req->PersistentFileId = persistent_fid;
2676         req->VolatileFileId = volatile_fid;
2677         req->AdditionalInformation = cpu_to_le32(additional_info);
2678
2679         req->OutputBufferLength = cpu_to_le32(output_len);
2680         if (input_len) {
2681                 req->InputBufferLength = cpu_to_le32(input_len);
2682                 /* total_len for smb query request never close to le16 max */
2683                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2684                 memcpy(req->Buffer, input, input_len);
2685         }
2686
2687         iov[0].iov_base = (char *)req;
2688         /* 1 for Buffer */
2689         iov[0].iov_len = total_len - 1 + input_len;
2690         return 0;
2691 }
2692
2693 void
2694 SMB2_query_info_free(struct smb_rqst *rqst)
2695 {
2696         if (rqst && rqst->rq_iov)
2697                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2698 }
2699
2700 static int
2701 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2702            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2703            u32 additional_info, size_t output_len, size_t min_len, void **data,
2704                 u32 *dlen)
2705 {
2706         struct smb_rqst rqst;
2707         struct smb2_query_info_rsp *rsp = NULL;
2708         struct kvec iov[1];
2709         struct kvec rsp_iov;
2710         int rc = 0;
2711         int resp_buftype = CIFS_NO_BUFFER;
2712         struct cifs_ses *ses = tcon->ses;
2713         int flags = 0;
2714
2715         cifs_dbg(FYI, "Query Info\n");
2716
2717         if (!ses || !(ses->server))
2718                 return -EIO;
2719
2720         if (smb3_encryption_required(tcon))
2721                 flags |= CIFS_TRANSFORM_REQ;
2722
2723         memset(&rqst, 0, sizeof(struct smb_rqst));
2724         memset(&iov, 0, sizeof(iov));
2725         rqst.rq_iov = iov;
2726         rqst.rq_nvec = 1;
2727
2728         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2729                                   info_class, info_type, additional_info,
2730                                   output_len, 0, NULL);
2731         if (rc)
2732                 goto qinf_exit;
2733
2734         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2735         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2736
2737         if (rc) {
2738                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2739                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2740                                 ses->Suid, info_class, (__u32)info_type, rc);
2741                 goto qinf_exit;
2742         }
2743
2744         if (dlen) {
2745                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2746                 if (!*data) {
2747                         *data = kmalloc(*dlen, GFP_KERNEL);
2748                         if (!*data) {
2749                                 cifs_dbg(VFS,
2750                                         "Error %d allocating memory for acl\n",
2751                                         rc);
2752                                 *dlen = 0;
2753                                 goto qinf_exit;
2754                         }
2755                 }
2756         }
2757
2758         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2759                                         le32_to_cpu(rsp->OutputBufferLength),
2760                                         &rsp_iov, min_len, *data);
2761
2762 qinf_exit:
2763         SMB2_query_info_free(&rqst);
2764         free_rsp_buf(resp_buftype, rsp);
2765         return rc;
2766 }
2767
2768 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2769                    u64 persistent_fid, u64 volatile_fid,
2770                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2771 {
2772         return query_info(xid, tcon, persistent_fid, volatile_fid,
2773                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2774                           ea_buf_size,
2775                           sizeof(struct smb2_file_full_ea_info),
2776                           (void **)&data,
2777                           NULL);
2778 }
2779
2780 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2781         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2782 {
2783         return query_info(xid, tcon, persistent_fid, volatile_fid,
2784                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2785                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2786                           sizeof(struct smb2_file_all_info), (void **)&data,
2787                           NULL);
2788 }
2789
2790 int
2791 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2792                 u64 persistent_fid, u64 volatile_fid,
2793                 void **data, u32 *plen)
2794 {
2795         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2796         *plen = 0;
2797
2798         return query_info(xid, tcon, persistent_fid, volatile_fid,
2799                           0, SMB2_O_INFO_SECURITY, additional_info,
2800                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2801 }
2802
2803 int
2804 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2805                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2806 {
2807         return query_info(xid, tcon, persistent_fid, volatile_fid,
2808                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2809                           sizeof(struct smb2_file_internal_info),
2810                           sizeof(struct smb2_file_internal_info),
2811                           (void **)&uniqueid, NULL);
2812 }
2813
2814 /*
2815  * This is a no-op for now. We're not really interested in the reply, but
2816  * rather in the fact that the server sent one and that server->lstrp
2817  * gets updated.
2818  *
2819  * FIXME: maybe we should consider checking that the reply matches request?
2820  */
2821 static void
2822 smb2_echo_callback(struct mid_q_entry *mid)
2823 {
2824         struct TCP_Server_Info *server = mid->callback_data;
2825         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2826         unsigned int credits_received = 1;
2827
2828         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2829                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2830
2831         DeleteMidQEntry(mid);
2832         add_credits(server, credits_received, CIFS_ECHO_OP);
2833 }
2834
2835 void smb2_reconnect_server(struct work_struct *work)
2836 {
2837         struct TCP_Server_Info *server = container_of(work,
2838                                         struct TCP_Server_Info, reconnect.work);
2839         struct cifs_ses *ses;
2840         struct cifs_tcon *tcon, *tcon2;
2841         struct list_head tmp_list;
2842         int tcon_exist = false;
2843         int rc;
2844         int resched = false;
2845
2846
2847         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2848         mutex_lock(&server->reconnect_mutex);
2849
2850         INIT_LIST_HEAD(&tmp_list);
2851         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2852
2853         spin_lock(&cifs_tcp_ses_lock);
2854         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2855                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2856                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2857                                 tcon->tc_count++;
2858                                 list_add_tail(&tcon->rlist, &tmp_list);
2859                                 tcon_exist = true;
2860                         }
2861                 }
2862                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2863                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2864                         tcon_exist = true;
2865                 }
2866         }
2867         /*
2868          * Get the reference to server struct to be sure that the last call of
2869          * cifs_put_tcon() in the loop below won't release the server pointer.
2870          */
2871         if (tcon_exist)
2872                 server->srv_count++;
2873
2874         spin_unlock(&cifs_tcp_ses_lock);
2875
2876         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2877                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2878                 if (!rc)
2879                         cifs_reopen_persistent_handles(tcon);
2880                 else
2881                         resched = true;
2882                 list_del_init(&tcon->rlist);
2883                 cifs_put_tcon(tcon);
2884         }
2885
2886         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2887         if (resched)
2888                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2889         mutex_unlock(&server->reconnect_mutex);
2890
2891         /* now we can safely release srv struct */
2892         if (tcon_exist)
2893                 cifs_put_tcp_session(server, 1);
2894 }
2895
2896 int
2897 SMB2_echo(struct TCP_Server_Info *server)
2898 {
2899         struct smb2_echo_req *req;
2900         int rc = 0;
2901         struct kvec iov[1];
2902         struct smb_rqst rqst = { .rq_iov = iov,
2903                                  .rq_nvec = 1 };
2904         unsigned int total_len;
2905
2906         cifs_dbg(FYI, "In echo request\n");
2907
2908         if (server->tcpStatus == CifsNeedNegotiate) {
2909                 /* No need to send echo on newly established connections */
2910                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2911                 return rc;
2912         }
2913
2914         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2915         if (rc)
2916                 return rc;
2917
2918         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2919
2920         iov[0].iov_len = total_len;
2921         iov[0].iov_base = (char *)req;
2922
2923         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2924                              server, CIFS_ECHO_OP);
2925         if (rc)
2926                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2927
2928         cifs_small_buf_release(req);
2929         return rc;
2930 }
2931
2932 int
2933 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2934            u64 volatile_fid)
2935 {
2936         struct smb_rqst rqst;
2937         struct smb2_flush_req *req;
2938         struct cifs_ses *ses = tcon->ses;
2939         struct kvec iov[1];
2940         struct kvec rsp_iov;
2941         int resp_buftype;
2942         int rc = 0;
2943         int flags = 0;
2944         unsigned int total_len;
2945
2946         cifs_dbg(FYI, "Flush\n");
2947
2948         if (!ses || !(ses->server))
2949                 return -EIO;
2950
2951         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2952         if (rc)
2953                 return rc;
2954
2955         if (smb3_encryption_required(tcon))
2956                 flags |= CIFS_TRANSFORM_REQ;
2957
2958         req->PersistentFileId = persistent_fid;
2959         req->VolatileFileId = volatile_fid;
2960
2961         iov[0].iov_base = (char *)req;
2962         iov[0].iov_len = total_len;
2963
2964         memset(&rqst, 0, sizeof(struct smb_rqst));
2965         rqst.rq_iov = iov;
2966         rqst.rq_nvec = 1;
2967
2968         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2969         cifs_small_buf_release(req);
2970
2971         if (rc != 0) {
2972                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2973                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2974                                      rc);
2975         }
2976
2977         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2978         return rc;
2979 }
2980
2981 /*
2982  * To form a chain of read requests, any read requests after the first should
2983  * have the end_of_chain boolean set to true.
2984  */
2985 static int
2986 smb2_new_read_req(void **buf, unsigned int *total_len,
2987         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2988         unsigned int remaining_bytes, int request_type)
2989 {
2990         int rc = -EACCES;
2991         struct smb2_read_plain_req *req = NULL;
2992         struct smb2_sync_hdr *shdr;
2993         struct TCP_Server_Info *server;
2994
2995         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2996                                  total_len);
2997         if (rc)
2998                 return rc;
2999
3000         server = io_parms->tcon->ses->server;
3001         if (server == NULL)
3002                 return -ECONNABORTED;
3003
3004         shdr = &req->sync_hdr;
3005         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3006
3007         req->PersistentFileId = io_parms->persistent_fid;
3008         req->VolatileFileId = io_parms->volatile_fid;
3009         req->ReadChannelInfoOffset = 0; /* reserved */
3010         req->ReadChannelInfoLength = 0; /* reserved */
3011         req->Channel = 0; /* reserved */
3012         req->MinimumCount = 0;
3013         req->Length = cpu_to_le32(io_parms->length);
3014         req->Offset = cpu_to_le64(io_parms->offset);
3015 #ifdef CONFIG_CIFS_SMB_DIRECT
3016         /*
3017          * If we want to do a RDMA write, fill in and append
3018          * smbd_buffer_descriptor_v1 to the end of read request
3019          */
3020         if (server->rdma && rdata && !server->sign &&
3021                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3022
3023                 struct smbd_buffer_descriptor_v1 *v1;
3024                 bool need_invalidate =
3025                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3026
3027                 rdata->mr = smbd_register_mr(
3028                                 server->smbd_conn, rdata->pages,
3029                                 rdata->nr_pages, rdata->page_offset,
3030                                 rdata->tailsz, true, need_invalidate);
3031                 if (!rdata->mr)
3032                         return -ENOBUFS;
3033
3034                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3035                 if (need_invalidate)
3036                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3037                 req->ReadChannelInfoOffset =
3038                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3039                 req->ReadChannelInfoLength =
3040                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3041                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3042                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3043                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3044                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3045
3046                 *total_len += sizeof(*v1) - 1;
3047         }
3048 #endif
3049         if (request_type & CHAINED_REQUEST) {
3050                 if (!(request_type & END_OF_CHAIN)) {
3051                         /* next 8-byte aligned request */
3052                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3053                         shdr->NextCommand = cpu_to_le32(*total_len);
3054                 } else /* END_OF_CHAIN */
3055                         shdr->NextCommand = 0;
3056                 if (request_type & RELATED_REQUEST) {
3057                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3058                         /*
3059                          * Related requests use info from previous read request
3060                          * in chain.
3061                          */
3062                         shdr->SessionId = 0xFFFFFFFF;
3063                         shdr->TreeId = 0xFFFFFFFF;
3064                         req->PersistentFileId = 0xFFFFFFFF;
3065                         req->VolatileFileId = 0xFFFFFFFF;
3066                 }
3067         }
3068         if (remaining_bytes > io_parms->length)
3069                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3070         else
3071                 req->RemainingBytes = 0;
3072
3073         *buf = req;
3074         return rc;
3075 }
3076
3077 static void
3078 smb2_readv_callback(struct mid_q_entry *mid)
3079 {
3080         struct cifs_readdata *rdata = mid->callback_data;
3081         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3082         struct TCP_Server_Info *server = tcon->ses->server;
3083         struct smb2_sync_hdr *shdr =
3084                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3085         unsigned int credits_received = 1;
3086         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3087                                  .rq_nvec = 2,
3088                                  .rq_pages = rdata->pages,
3089                                  .rq_offset = rdata->page_offset,
3090                                  .rq_npages = rdata->nr_pages,
3091                                  .rq_pagesz = rdata->pagesz,
3092                                  .rq_tailsz = rdata->tailsz };
3093
3094         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3095                  __func__, mid->mid, mid->mid_state, rdata->result,
3096                  rdata->bytes);
3097
3098         switch (mid->mid_state) {
3099         case MID_RESPONSE_RECEIVED:
3100                 credits_received = le16_to_cpu(shdr->CreditRequest);
3101                 /* result already set, check signature */
3102                 if (server->sign && !mid->decrypted) {
3103                         int rc;
3104
3105                         rc = smb2_verify_signature(&rqst, server);
3106                         if (rc)
3107                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3108                                          rc);
3109                 }
3110                 /* FIXME: should this be counted toward the initiating task? */
3111                 task_io_account_read(rdata->got_bytes);
3112                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3113                 break;
3114         case MID_REQUEST_SUBMITTED:
3115         case MID_RETRY_NEEDED:
3116                 rdata->result = -EAGAIN;
3117                 if (server->sign && rdata->got_bytes)
3118                         /* reset bytes number since we can not check a sign */
3119                         rdata->got_bytes = 0;
3120                 /* FIXME: should this be counted toward the initiating task? */
3121                 task_io_account_read(rdata->got_bytes);
3122                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3123                 break;
3124         default:
3125                 if (rdata->result != -ENODATA)
3126                         rdata->result = -EIO;
3127         }
3128 #ifdef CONFIG_CIFS_SMB_DIRECT
3129         /*
3130          * If this rdata has a memmory registered, the MR can be freed
3131          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3132          * because they have limited number and are used for future I/Os
3133          */
3134         if (rdata->mr) {
3135                 smbd_deregister_mr(rdata->mr);
3136                 rdata->mr = NULL;
3137         }
3138 #endif
3139         if (rdata->result)
3140                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3141
3142         queue_work(cifsiod_wq, &rdata->work);
3143         DeleteMidQEntry(mid);
3144         add_credits(server, credits_received, 0);
3145 }
3146
3147 /* smb2_async_readv - send an async read, and set up mid to handle result */
3148 int
3149 smb2_async_readv(struct cifs_readdata *rdata)
3150 {
3151         int rc, flags = 0;
3152         char *buf;
3153         struct smb2_sync_hdr *shdr;
3154         struct cifs_io_parms io_parms;
3155         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3156                                  .rq_nvec = 1 };
3157         struct TCP_Server_Info *server;
3158         unsigned int total_len;
3159
3160         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3161                  __func__, rdata->offset, rdata->bytes);
3162
3163         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3164         io_parms.offset = rdata->offset;
3165         io_parms.length = rdata->bytes;
3166         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3167         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3168         io_parms.pid = rdata->pid;
3169
3170         server = io_parms.tcon->ses->server;
3171
3172         rc = smb2_new_read_req(
3173                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3174         if (rc) {
3175                 if (rc == -EAGAIN && rdata->credits) {
3176                         /* credits was reset by reconnect */
3177                         rdata->credits = 0;
3178                         /* reduce in_flight value since we won't send the req */
3179                         spin_lock(&server->req_lock);
3180                         server->in_flight--;
3181                         spin_unlock(&server->req_lock);
3182                 }
3183                 return rc;
3184         }
3185
3186         if (smb3_encryption_required(io_parms.tcon))
3187                 flags |= CIFS_TRANSFORM_REQ;
3188
3189         rdata->iov[0].iov_base = buf;
3190         rdata->iov[0].iov_len = total_len;
3191
3192         shdr = (struct smb2_sync_hdr *)buf;
3193
3194         if (rdata->credits) {
3195                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3196                                                 SMB2_MAX_BUFFER_SIZE));
3197                 shdr->CreditRequest = shdr->CreditCharge;
3198                 spin_lock(&server->req_lock);
3199                 server->credits += rdata->credits -
3200                                                 le16_to_cpu(shdr->CreditCharge);
3201                 spin_unlock(&server->req_lock);
3202                 wake_up(&server->request_q);
3203                 flags |= CIFS_HAS_CREDITS;
3204         }
3205
3206         kref_get(&rdata->refcount);
3207         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3208                              cifs_readv_receive, smb2_readv_callback,
3209                              smb3_handle_read_data, rdata, flags);
3210         if (rc) {
3211                 kref_put(&rdata->refcount, cifs_readdata_release);
3212                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3213                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3214                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3215                                    io_parms.offset, io_parms.length);
3216         } else
3217                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3218                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3219                                    io_parms.offset, io_parms.length);
3220
3221         cifs_small_buf_release(buf);
3222         return rc;
3223 }
3224
3225 int
3226 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3227           unsigned int *nbytes, char **buf, int *buf_type)
3228 {
3229         struct smb_rqst rqst;
3230         int resp_buftype, rc = -EACCES;
3231         struct smb2_read_plain_req *req = NULL;
3232         struct smb2_read_rsp *rsp = NULL;
3233         struct kvec iov[1];
3234         struct kvec rsp_iov;
3235         unsigned int total_len;
3236         int flags = CIFS_LOG_ERROR;
3237         struct cifs_ses *ses = io_parms->tcon->ses;
3238
3239         *nbytes = 0;
3240         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3241         if (rc)
3242                 return rc;
3243
3244         if (smb3_encryption_required(io_parms->tcon))
3245                 flags |= CIFS_TRANSFORM_REQ;
3246
3247         iov[0].iov_base = (char *)req;
3248         iov[0].iov_len = total_len;
3249
3250         memset(&rqst, 0, sizeof(struct smb_rqst));
3251         rqst.rq_iov = iov;
3252         rqst.rq_nvec = 1;
3253
3254         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3255         cifs_small_buf_release(req);
3256
3257         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3258
3259         if (rc) {
3260                 if (rc != -ENODATA) {
3261                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3262                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3263                 }
3264                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3265                                     io_parms->tcon->tid, ses->Suid,
3266                                     io_parms->offset, io_parms->length);
3267                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3268                 return rc == -ENODATA ? 0 : rc;
3269         } else
3270                 trace_smb3_read_done(xid, req->PersistentFileId,
3271                                     io_parms->tcon->tid, ses->Suid,
3272                                     io_parms->offset, io_parms->length);
3273
3274         *nbytes = le32_to_cpu(rsp->DataLength);
3275         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3276             (*nbytes > io_parms->length)) {
3277                 cifs_dbg(FYI, "bad length %d for count %d\n",
3278                          *nbytes, io_parms->length);
3279                 rc = -EIO;
3280                 *nbytes = 0;
3281         }
3282
3283         if (*buf) {
3284                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3285                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3286         } else if (resp_buftype != CIFS_NO_BUFFER) {
3287                 *buf = rsp_iov.iov_base;
3288                 if (resp_buftype == CIFS_SMALL_BUFFER)
3289                         *buf_type = CIFS_SMALL_BUFFER;
3290                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3291                         *buf_type = CIFS_LARGE_BUFFER;
3292         }
3293         return rc;
3294 }
3295
3296 /*
3297  * Check the mid_state and signature on received buffer (if any), and queue the
3298  * workqueue completion task.
3299  */
3300 static void
3301 smb2_writev_callback(struct mid_q_entry *mid)
3302 {
3303         struct cifs_writedata *wdata = mid->callback_data;
3304         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3305         unsigned int written;
3306         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3307         unsigned int credits_received = 1;
3308
3309         switch (mid->mid_state) {
3310         case MID_RESPONSE_RECEIVED:
3311                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3312                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3313                 if (wdata->result != 0)
3314                         break;
3315
3316                 written = le32_to_cpu(rsp->DataLength);
3317                 /*
3318                  * Mask off high 16 bits when bytes written as returned
3319                  * by the server is greater than bytes requested by the
3320                  * client. OS/2 servers are known to set incorrect
3321                  * CountHigh values.
3322                  */
3323                 if (written > wdata->bytes)
3324                         written &= 0xFFFF;
3325
3326                 if (written < wdata->bytes)
3327                         wdata->result = -ENOSPC;
3328                 else
3329                         wdata->bytes = written;
3330                 break;
3331         case MID_REQUEST_SUBMITTED:
3332         case MID_RETRY_NEEDED:
3333                 wdata->result = -EAGAIN;
3334                 break;
3335         default:
3336                 wdata->result = -EIO;
3337                 break;
3338         }
3339 #ifdef CONFIG_CIFS_SMB_DIRECT
3340         /*
3341          * If this wdata has a memory registered, the MR can be freed
3342          * The number of MRs available is limited, it's important to recover
3343          * used MR as soon as I/O is finished. Hold MR longer in the later
3344          * I/O process can possibly result in I/O deadlock due to lack of MR
3345          * to send request on I/O retry
3346          */
3347         if (wdata->mr) {
3348                 smbd_deregister_mr(wdata->mr);
3349                 wdata->mr = NULL;
3350         }
3351 #endif
3352         if (wdata->result)
3353                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3354
3355         queue_work(cifsiod_wq, &wdata->work);
3356         DeleteMidQEntry(mid);
3357         add_credits(tcon->ses->server, credits_received, 0);
3358 }
3359
3360 /* smb2_async_writev - send an async write, and set up mid to handle result */
3361 int
3362 smb2_async_writev(struct cifs_writedata *wdata,
3363                   void (*release)(struct kref *kref))
3364 {
3365         int rc = -EACCES, flags = 0;
3366         struct smb2_write_req *req = NULL;
3367         struct smb2_sync_hdr *shdr;
3368         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3369         struct TCP_Server_Info *server = tcon->ses->server;
3370         struct kvec iov[1];
3371         struct smb_rqst rqst = { };
3372         unsigned int total_len;
3373
3374         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3375         if (rc) {
3376                 if (rc == -EAGAIN && wdata->credits) {
3377                         /* credits was reset by reconnect */
3378                         wdata->credits = 0;
3379                         /* reduce in_flight value since we won't send the req */
3380                         spin_lock(&server->req_lock);
3381                         server->in_flight--;
3382                         spin_unlock(&server->req_lock);
3383                 }
3384                 goto async_writev_out;
3385         }
3386
3387         if (smb3_encryption_required(tcon))
3388                 flags |= CIFS_TRANSFORM_REQ;
3389
3390         shdr = (struct smb2_sync_hdr *)req;
3391         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3392
3393         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3394         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3395         req->WriteChannelInfoOffset = 0;
3396         req->WriteChannelInfoLength = 0;
3397         req->Channel = 0;
3398         req->Offset = cpu_to_le64(wdata->offset);
3399         req->DataOffset = cpu_to_le16(
3400                                 offsetof(struct smb2_write_req, Buffer));
3401         req->RemainingBytes = 0;
3402 #ifdef CONFIG_CIFS_SMB_DIRECT
3403         /*
3404          * If we want to do a server RDMA read, fill in and append
3405          * smbd_buffer_descriptor_v1 to the end of write request
3406          */
3407         if (server->rdma && !server->sign && wdata->bytes >=
3408                 server->smbd_conn->rdma_readwrite_threshold) {
3409
3410                 struct smbd_buffer_descriptor_v1 *v1;
3411                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3412
3413                 wdata->mr = smbd_register_mr(
3414                                 server->smbd_conn, wdata->pages,
3415                                 wdata->nr_pages, wdata->page_offset,
3416                                 wdata->tailsz, false, need_invalidate);
3417                 if (!wdata->mr) {
3418                         rc = -ENOBUFS;
3419                         goto async_writev_out;
3420                 }
3421                 req->Length = 0;
3422                 req->DataOffset = 0;
3423                 if (wdata->nr_pages > 1)
3424                         req->RemainingBytes =
3425                                 cpu_to_le32(
3426                                         (wdata->nr_pages - 1) * wdata->pagesz -
3427                                         wdata->page_offset + wdata->tailsz
3428                                 );
3429                 else
3430                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3431                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3432                 if (need_invalidate)
3433                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3434                 req->WriteChannelInfoOffset =
3435                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3436                 req->WriteChannelInfoLength =
3437                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3438                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3439                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3440                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3441                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3442         }
3443 #endif
3444         iov[0].iov_len = total_len - 1;
3445         iov[0].iov_base = (char *)req;
3446
3447         rqst.rq_iov = iov;
3448         rqst.rq_nvec = 1;
3449         rqst.rq_pages = wdata->pages;
3450         rqst.rq_offset = wdata->page_offset;
3451         rqst.rq_npages = wdata->nr_pages;
3452         rqst.rq_pagesz = wdata->pagesz;
3453         rqst.rq_tailsz = wdata->tailsz;
3454 #ifdef CONFIG_CIFS_SMB_DIRECT
3455         if (wdata->mr) {
3456                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3457                 rqst.rq_npages = 0;
3458         }
3459 #endif
3460         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3461                  wdata->offset, wdata->bytes);
3462
3463 #ifdef CONFIG_CIFS_SMB_DIRECT
3464         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3465         if (!wdata->mr)
3466                 req->Length = cpu_to_le32(wdata->bytes);
3467 #else
3468         req->Length = cpu_to_le32(wdata->bytes);
3469 #endif
3470
3471         if (wdata->credits) {
3472                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3473                                                     SMB2_MAX_BUFFER_SIZE));
3474                 shdr->CreditRequest = shdr->CreditCharge;
3475                 spin_lock(&server->req_lock);
3476                 server->credits += wdata->credits -
3477                                                 le16_to_cpu(shdr->CreditCharge);
3478                 spin_unlock(&server->req_lock);
3479                 wake_up(&server->request_q);
3480                 flags |= CIFS_HAS_CREDITS;
3481         }
3482
3483         kref_get(&wdata->refcount);
3484         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3485                              wdata, flags);
3486
3487         if (rc) {
3488                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3489                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3490                                      wdata->bytes, rc);
3491                 kref_put(&wdata->refcount, release);
3492                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3493         } else
3494                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3495                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3496                                      wdata->bytes);
3497
3498 async_writev_out:
3499         cifs_small_buf_release(req);
3500         return rc;
3501 }
3502
3503 /*
3504  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3505  * The length field from io_parms must be at least 1 and indicates a number of
3506  * elements with data to write that begins with position 1 in iov array. All
3507  * data length is specified by count.
3508  */
3509 int
3510 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3511            unsigned int *nbytes, struct kvec *iov, int n_vec)
3512 {
3513         struct smb_rqst rqst;
3514         int rc = 0;
3515         struct smb2_write_req *req = NULL;
3516         struct smb2_write_rsp *rsp = NULL;
3517         int resp_buftype;
3518         struct kvec rsp_iov;
3519         int flags = 0;
3520         unsigned int total_len;
3521
3522         *nbytes = 0;
3523
3524         if (n_vec < 1)
3525                 return rc;
3526
3527         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3528                              &total_len);
3529         if (rc)
3530                 return rc;
3531
3532         if (io_parms->tcon->ses->server == NULL)
3533                 return -ECONNABORTED;
3534
3535         if (smb3_encryption_required(io_parms->tcon))
3536                 flags |= CIFS_TRANSFORM_REQ;
3537
3538         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3539
3540         req->PersistentFileId = io_parms->persistent_fid;
3541         req->VolatileFileId = io_parms->volatile_fid;
3542         req->WriteChannelInfoOffset = 0;
3543         req->WriteChannelInfoLength = 0;
3544         req->Channel = 0;
3545         req->Length = cpu_to_le32(io_parms->length);
3546         req->Offset = cpu_to_le64(io_parms->offset);
3547         req->DataOffset = cpu_to_le16(
3548                                 offsetof(struct smb2_write_req, Buffer));
3549         req->RemainingBytes = 0;
3550
3551         iov[0].iov_base = (char *)req;
3552         /* 1 for Buffer */
3553         iov[0].iov_len = total_len - 1;
3554
3555         memset(&rqst, 0, sizeof(struct smb_rqst));
3556         rqst.rq_iov = iov;
3557         rqst.rq_nvec = n_vec + 1;
3558
3559         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3560                             &resp_buftype, flags, &rsp_iov);
3561         cifs_small_buf_release(req);
3562         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3563
3564         if (rc) {
3565                 trace_smb3_write_err(xid, req->PersistentFileId,
3566                                      io_parms->tcon->tid,
3567                                      io_parms->tcon->ses->Suid,
3568                                      io_parms->offset, io_parms->length, rc);
3569                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3570                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3571         } else {
3572                 *nbytes = le32_to_cpu(rsp->DataLength);
3573                 trace_smb3_write_done(xid, req->PersistentFileId,
3574                                      io_parms->tcon->tid,
3575                                      io_parms->tcon->ses->Suid,
3576                                      io_parms->offset, *nbytes);
3577         }
3578
3579         free_rsp_buf(resp_buftype, rsp);
3580         return rc;
3581 }
3582
3583 static unsigned int
3584 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3585 {
3586         int len;
3587         unsigned int entrycount = 0;
3588         unsigned int next_offset = 0;
3589         char *entryptr;
3590         FILE_DIRECTORY_INFO *dir_info;
3591
3592         if (bufstart == NULL)
3593                 return 0;
3594
3595         entryptr = bufstart;
3596
3597         while (1) {
3598                 if (entryptr + next_offset < entryptr ||
3599                     entryptr + next_offset > end_of_buf ||
3600                     entryptr + next_offset + size > end_of_buf) {
3601                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3602                         break;
3603                 }
3604
3605                 entryptr = entryptr + next_offset;
3606                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3607
3608                 len = le32_to_cpu(dir_info->FileNameLength);
3609                 if (entryptr + len < entryptr ||
3610                     entryptr + len > end_of_buf ||
3611                     entryptr + len + size > end_of_buf) {
3612                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3613                                  end_of_buf);
3614                         break;
3615                 }
3616
3617                 *lastentry = entryptr;
3618                 entrycount++;
3619
3620                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3621                 if (!next_offset)
3622                         break;
3623         }
3624
3625         return entrycount;
3626 }
3627
3628 /*
3629  * Readdir/FindFirst
3630  */
3631 int
3632 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3633                      u64 persistent_fid, u64 volatile_fid, int index,
3634                      struct cifs_search_info *srch_inf)
3635 {
3636         struct smb_rqst rqst;
3637         struct smb2_query_directory_req *req;
3638         struct smb2_query_directory_rsp *rsp = NULL;
3639         struct kvec iov[2];
3640         struct kvec rsp_iov;
3641         int rc = 0;
3642         int len;
3643         int resp_buftype = CIFS_NO_BUFFER;
3644         unsigned char *bufptr;
3645         struct TCP_Server_Info *server;
3646         struct cifs_ses *ses = tcon->ses;
3647         __le16 asteriks = cpu_to_le16('*');
3648         char *end_of_smb;
3649         unsigned int output_size = CIFSMaxBufSize;
3650         size_t info_buf_size;
3651         int flags = 0;
3652         unsigned int total_len;
3653
3654         if (ses && (ses->server))
3655                 server = ses->server;
3656         else
3657                 return -EIO;
3658
3659         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3660                              &total_len);
3661         if (rc)
3662                 return rc;
3663
3664         if (smb3_encryption_required(tcon))
3665                 flags |= CIFS_TRANSFORM_REQ;
3666
3667         switch (srch_inf->info_level) {
3668         case SMB_FIND_FILE_DIRECTORY_INFO:
3669                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3670                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3671                 break;
3672         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3673                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3674                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3675                 break;
3676         default:
3677                 cifs_dbg(VFS, "info level %u isn't supported\n",
3678                          srch_inf->info_level);
3679                 rc = -EINVAL;
3680                 goto qdir_exit;
3681         }
3682
3683         req->FileIndex = cpu_to_le32(index);
3684         req->PersistentFileId = persistent_fid;
3685         req->VolatileFileId = volatile_fid;
3686
3687         len = 0x2;
3688         bufptr = req->Buffer;
3689         memcpy(bufptr, &asteriks, len);
3690
3691         req->FileNameOffset =
3692                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3693         req->FileNameLength = cpu_to_le16(len);
3694         /*
3695          * BB could be 30 bytes or so longer if we used SMB2 specific
3696          * buffer lengths, but this is safe and close enough.
3697          */
3698         output_size = min_t(unsigned int, output_size, server->maxBuf);
3699         output_size = min_t(unsigned int, output_size, 2 << 15);
3700         req->OutputBufferLength = cpu_to_le32(output_size);
3701
3702         iov[0].iov_base = (char *)req;
3703         /* 1 for Buffer */
3704         iov[0].iov_len = total_len - 1;
3705
3706         iov[1].iov_base = (char *)(req->Buffer);
3707         iov[1].iov_len = len;
3708
3709         memset(&rqst, 0, sizeof(struct smb_rqst));
3710         rqst.rq_iov = iov;
3711         rqst.rq_nvec = 2;
3712
3713         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3714         cifs_small_buf_release(req);
3715         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3716
3717         if (rc) {
3718                 if (rc == -ENODATA &&
3719                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3720                         srch_inf->endOfSearch = true;
3721                         rc = 0;
3722                 }
3723                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3724                 goto qdir_exit;
3725         }
3726
3727         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3728                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3729                                info_buf_size);
3730         if (rc)
3731                 goto qdir_exit;
3732
3733         srch_inf->unicode = true;
3734
3735         if (srch_inf->ntwrk_buf_start) {
3736                 if (srch_inf->smallBuf)
3737                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3738                 else
3739                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3740         }
3741         srch_inf->ntwrk_buf_start = (char *)rsp;
3742         srch_inf->srch_entries_start = srch_inf->last_entry =
3743                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3744         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3745         srch_inf->entries_in_buffer =
3746                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3747                                     &srch_inf->last_entry, info_buf_size);
3748         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3749         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3750                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3751                  srch_inf->srch_entries_start, srch_inf->last_entry);
3752         if (resp_buftype == CIFS_LARGE_BUFFER)
3753                 srch_inf->smallBuf = false;
3754         else if (resp_buftype == CIFS_SMALL_BUFFER)
3755                 srch_inf->smallBuf = true;
3756         else
3757                 cifs_dbg(VFS, "illegal search buffer type\n");
3758
3759         return rc;
3760
3761 qdir_exit:
3762         free_rsp_buf(resp_buftype, rsp);
3763         return rc;
3764 }
3765
3766 int
3767 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3768                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3769                u8 info_type, u32 additional_info,
3770                 void **data, unsigned int *size)
3771 {
3772         struct smb2_set_info_req *req;
3773         struct kvec *iov = rqst->rq_iov;
3774         unsigned int i, total_len;
3775         int rc;
3776
3777         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3778         if (rc)
3779                 return rc;
3780
3781         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3782         req->InfoType = info_type;
3783         req->FileInfoClass = info_class;
3784         req->PersistentFileId = persistent_fid;
3785         req->VolatileFileId = volatile_fid;
3786         req->AdditionalInformation = cpu_to_le32(additional_info);
3787
3788         req->BufferOffset =
3789                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3790         req->BufferLength = cpu_to_le32(*size);
3791
3792         memcpy(req->Buffer, *data, *size);
3793         total_len += *size;
3794
3795         iov[0].iov_base = (char *)req;
3796         /* 1 for Buffer */
3797         iov[0].iov_len = total_len - 1;
3798
3799         for (i = 1; i < rqst->rq_nvec; i++) {
3800                 le32_add_cpu(&req->BufferLength, size[i]);
3801                 iov[i].iov_base = (char *)data[i];
3802                 iov[i].iov_len = size[i];
3803         }
3804
3805         return 0;
3806 }
3807
3808 void
3809 SMB2_set_info_free(struct smb_rqst *rqst)
3810 {
3811         if (rqst && rqst->rq_iov)
3812                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3813 }
3814
3815 static int
3816 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3817                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3818                u8 info_type, u32 additional_info, unsigned int num,
3819                 void **data, unsigned int *size)
3820 {
3821         struct smb_rqst rqst;
3822         struct smb2_set_info_rsp *rsp = NULL;
3823         struct kvec *iov;
3824         struct kvec rsp_iov;
3825         int rc = 0;
3826         int resp_buftype;
3827         struct cifs_ses *ses = tcon->ses;
3828         int flags = 0;
3829
3830         if (!ses || !(ses->server))
3831                 return -EIO;
3832
3833         if (!num)
3834                 return -EINVAL;
3835
3836         if (smb3_encryption_required(tcon))
3837                 flags |= CIFS_TRANSFORM_REQ;
3838
3839         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3840         if (!iov)
3841                 return -ENOMEM;
3842
3843         memset(&rqst, 0, sizeof(struct smb_rqst));
3844         rqst.rq_iov = iov;
3845         rqst.rq_nvec = num;
3846
3847         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3848                                 info_class, info_type, additional_info,
3849                                 data, size);
3850         if (rc) {
3851                 kfree(iov);
3852                 return rc;
3853         }
3854
3855
3856         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3857                             &rsp_iov);
3858         SMB2_set_info_free(&rqst);
3859         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3860
3861         if (rc != 0) {
3862                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3863                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3864                                 ses->Suid, info_class, (__u32)info_type, rc);
3865         }
3866
3867         free_rsp_buf(resp_buftype, rsp);
3868         kfree(iov);
3869         return rc;
3870 }
3871
3872 int
3873 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3874              u64 volatile_fid, u32 pid, __le64 *eof)
3875 {
3876         struct smb2_file_eof_info info;
3877         void *data;
3878         unsigned int size;
3879
3880         info.EndOfFile = *eof;
3881
3882         data = &info;
3883         size = sizeof(struct smb2_file_eof_info);
3884
3885         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3886                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3887                         0, 1, &data, &size);
3888 }
3889
3890 int
3891 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3892                 u64 persistent_fid, u64 volatile_fid,
3893                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3894 {
3895         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3896                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3897                         1, (void **)&pnntsd, &pacllen);
3898 }
3899
3900 int
3901 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3902             u64 persistent_fid, u64 volatile_fid,
3903             struct smb2_file_full_ea_info *buf, int len)
3904 {
3905         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3906                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3907                 0, 1, (void **)&buf, &len);
3908 }
3909
3910 int
3911 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3912                   const u64 persistent_fid, const u64 volatile_fid,
3913                   __u8 oplock_level)
3914 {
3915         struct smb_rqst rqst;
3916         int rc;
3917         struct smb2_oplock_break *req = NULL;
3918         struct cifs_ses *ses = tcon->ses;
3919         int flags = CIFS_OBREAK_OP;
3920         unsigned int total_len;
3921         struct kvec iov[1];
3922         struct kvec rsp_iov;
3923         int resp_buf_type;
3924
3925         cifs_dbg(FYI, "SMB2_oplock_break\n");
3926         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3927                              &total_len);
3928         if (rc)
3929                 return rc;
3930
3931         if (smb3_encryption_required(tcon))
3932                 flags |= CIFS_TRANSFORM_REQ;
3933
3934         req->VolatileFid = volatile_fid;
3935         req->PersistentFid = persistent_fid;
3936         req->OplockLevel = oplock_level;
3937         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3938
3939         flags |= CIFS_NO_RESP;
3940
3941         iov[0].iov_base = (char *)req;
3942         iov[0].iov_len = total_len;
3943
3944         memset(&rqst, 0, sizeof(struct smb_rqst));
3945         rqst.rq_iov = iov;
3946         rqst.rq_nvec = 1;
3947
3948         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3949         cifs_small_buf_release(req);
3950
3951         if (rc) {
3952                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3953                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3954         }
3955
3956         return rc;
3957 }
3958
3959 void
3960 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3961                              struct kstatfs *kst)
3962 {
3963         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3964                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3965         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3966         kst->f_bfree  = kst->f_bavail =
3967                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3968         return;
3969 }
3970
3971 static void
3972 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
3973                         struct kstatfs *kst)
3974 {
3975         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
3976         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
3977         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
3978         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
3979                 kst->f_bavail = kst->f_bfree;
3980         else
3981                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
3982         if (response_data->TotalFileNodes != cpu_to_le64(-1))
3983                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
3984         if (response_data->FreeFileNodes != cpu_to_le64(-1))
3985                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
3986
3987         return;
3988 }
3989
3990 static int
3991 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3992                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3993 {
3994         struct TCP_Server_Info *server;
3995         int rc;
3996         struct smb2_query_info_req *req;
3997         unsigned int total_len;
3998
3999         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4000
4001         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4002                 return -EIO;
4003
4004         server = tcon->ses->server;
4005
4006         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4007                              &total_len);
4008         if (rc)
4009                 return rc;
4010
4011         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4012         req->FileInfoClass = level;
4013         req->PersistentFileId = persistent_fid;
4014         req->VolatileFileId = volatile_fid;
4015         /* 1 for pad */
4016         req->InputBufferOffset =
4017                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4018         req->OutputBufferLength = cpu_to_le32(
4019                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4020
4021         iov->iov_base = (char *)req;
4022         iov->iov_len = total_len;
4023         return 0;
4024 }
4025
4026 int
4027 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4028               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4029 {
4030         struct smb_rqst rqst;
4031         struct smb2_query_info_rsp *rsp = NULL;
4032         struct kvec iov;
4033         struct kvec rsp_iov;
4034         int rc = 0;
4035         int resp_buftype;
4036         struct cifs_ses *ses = tcon->ses;
4037         FILE_SYSTEM_POSIX_INFO *info = NULL;
4038         int flags = 0;
4039
4040         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4041           &