?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'timers_urgent_for_v6.13_rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[drm/drm-misc.git] / fs / smb / client / smb2pdu.c
blob010eae9d6c47e24d46ddc588d8f0e17dd6445095
1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
12
13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
14 /* Note that there are handle based routines which must be */
15 /* treated slightly differently for reconnection purposes since we never */
16 /* want to reuse a stale file handle and only the caller knows the file info */
17
18 #include <linux/fs.h>
19 #include <linux/kernel.h>
20 #include <linux/vfs.h>
21 #include <linux/task_io_accounting_ops.h>
22 #include <linux/uaccess.h>
23 #include <linux/uuid.h>
24 #include <linux/pagemap.h>
25 #include <linux/xattr.h>
26 #include <linux/netfs.h>
27 #include <trace/events/netfs.h>
28 #include "cifsglob.h"
29 #include "cifsacl.h"
30 #include "cifsproto.h"
31 #include "smb2proto.h"
32 #include "cifs_unicode.h"
33 #include "cifs_debug.h"
34 #include "ntlmssp.h"
35 #include "../common/smb2status.h"
36 #include "smb2glob.h"
37 #include "cifspdu.h"
38 #include "cifs_spnego.h"
39 #include "smbdirect.h"
40 #include "trace.h"
41 #ifdef CONFIG_CIFS_DFS_UPCALL
42 #include "dfs_cache.h"
43 #endif
44 #include "cached_dir.h"
45 #include "compress.h"
46
47 /*
48 * The following table defines the expected "StructureSize" of SMB2 requests
49 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
50 *
51 * Note that commands are defined in smb2pdu.h in le16 but the array below is
52 * indexed by command in host byte order.
53 */
54 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
55 /* SMB2_NEGOTIATE */ 36,
56 /* SMB2_SESSION_SETUP */ 25,
57 /* SMB2_LOGOFF */ 4,
58 /* SMB2_TREE_CONNECT */ 9,
59 /* SMB2_TREE_DISCONNECT */ 4,
60 /* SMB2_CREATE */ 57,
61 /* SMB2_CLOSE */ 24,
62 /* SMB2_FLUSH */ 24,
63 /* SMB2_READ */ 49,
64 /* SMB2_WRITE */ 49,
65 /* SMB2_LOCK */ 48,
66 /* SMB2_IOCTL */ 57,
67 /* SMB2_CANCEL */ 4,
68 /* SMB2_ECHO */ 4,
69 /* SMB2_QUERY_DIRECTORY */ 33,
70 /* SMB2_CHANGE_NOTIFY */ 32,
71 /* SMB2_QUERY_INFO */ 41,
72 /* SMB2_SET_INFO */ 33,
73 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
74 };
75
76 int smb3_encryption_required(const struct cifs_tcon *tcon)
77 {
78 if (!tcon || !tcon->ses)
79 return 0;
80 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
81 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
82 return 1;
83 if (tcon->seal &&
84 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
85 return 1;
86 if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
87 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
88 return 1;
89 return 0;
90 }
91
92 static void
93 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
94 const struct cifs_tcon *tcon,
95 struct TCP_Server_Info *server)
96 {
97 struct smb3_hdr_req *smb3_hdr;
98
99 shdr->ProtocolId = SMB2_PROTO_NUMBER;
100 shdr->StructureSize = cpu_to_le16(64);
101 shdr->Command = smb2_cmd;
102
103 if (server) {
104 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
105 if (server->dialect >= SMB30_PROT_ID) {
106 smb3_hdr = (struct smb3_hdr_req *)shdr;
107 /*
108 * if primary channel is not set yet, use default
109 * channel for chan sequence num
110 */
111 if (SERVER_IS_CHAN(server))
112 smb3_hdr->ChannelSequence =
113 cpu_to_le16(server->primary_server->channel_sequence_num);
114 else
115 smb3_hdr->ChannelSequence =
116 cpu_to_le16(server->channel_sequence_num);
117 }
118 spin_lock(&server->req_lock);
119 /* Request up to 10 credits but don't go over the limit. */
120 if (server->credits >= server->max_credits)
121 shdr->CreditRequest = cpu_to_le16(0);
122 else
123 shdr->CreditRequest = cpu_to_le16(
124 min_t(int, server->max_credits -
125 server->credits, 10));
126 spin_unlock(&server->req_lock);
127 } else {
128 shdr->CreditRequest = cpu_to_le16(2);
129 }
130 shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
131
132 if (!tcon)
133 goto out;
134
135 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
136 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
137 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
138 shdr->CreditCharge = cpu_to_le16(1);
139 /* else CreditCharge MBZ */
140
141 shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
142 /* Uid is not converted */
143 if (tcon->ses)
144 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
145
146 /*
147 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
148 * to pass the path on the Open SMB prefixed by \\server\share.
149 * Not sure when we would need to do the augmented path (if ever) and
150 * setting this flag breaks the SMB2 open operation since it is
151 * illegal to send an empty path name (without \\server\share prefix)
152 * when the DFS flag is set in the SMB open header. We could
153 * consider setting the flag on all operations other than open
154 * but it is safer to net set it for now.
155 */
156 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
157 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
158
159 if (server && server->sign && !smb3_encryption_required(tcon))
160 shdr->Flags |= SMB2_FLAGS_SIGNED;
161 out:
162 return;
163 }
164
165 /* helper function for code reuse */
166 static int
167 cifs_chan_skip_or_disable(struct cifs_ses *ses,
168 struct TCP_Server_Info *server,
169 bool from_reconnect)
170 {
171 struct TCP_Server_Info *pserver;
172 unsigned int chan_index;
173
174 if (SERVER_IS_CHAN(server)) {
175 cifs_dbg(VFS,
176 "server %s does not support multichannel anymore. Skip secondary channel\n",
177 ses->server->hostname);
178
179 spin_lock(&ses->chan_lock);
180 chan_index = cifs_ses_get_chan_index(ses, server);
181 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
182 spin_unlock(&ses->chan_lock);
183 goto skip_terminate;
184 }
185
186 ses->chans[chan_index].server = NULL;
187 server->terminate = true;
188 spin_unlock(&ses->chan_lock);
189
190 /*
191 * the above reference of server by channel
192 * needs to be dropped without holding chan_lock
193 * as cifs_put_tcp_session takes a higher lock
194 * i.e. cifs_tcp_ses_lock
195 */
196 cifs_put_tcp_session(server, from_reconnect);
197
198 cifs_signal_cifsd_for_reconnect(server, false);
199
200 /* mark primary server as needing reconnect */
201 pserver = server->primary_server;
202 cifs_signal_cifsd_for_reconnect(pserver, false);
203 skip_terminate:
204 return -EHOSTDOWN;
205 }
206
207 cifs_server_dbg(VFS,
208 "server does not support multichannel anymore. Disable all other channels\n");
209 cifs_disable_secondary_channels(ses);
210
211
212 return 0;
213 }
214
215 static int
216 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
217 struct TCP_Server_Info *server, bool from_reconnect)
218 {
219 struct cifs_ses *ses;
220 int xid;
221 int rc = 0;
222
223 /*
224 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
225 * check for tcp and smb session status done differently
226 * for those three - in the calling routine.
227 */
228 if (tcon == NULL)
229 return 0;
230
231 if (smb2_command == SMB2_TREE_CONNECT)
232 return 0;
233
234 spin_lock(&tcon->tc_lock);
235 if (tcon->status == TID_EXITING) {
236 /*
237 * only tree disconnect allowed when disconnecting ...
238 */
239 if (smb2_command != SMB2_TREE_DISCONNECT) {
240 spin_unlock(&tcon->tc_lock);
241 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
242 smb2_command);
243 return -ENODEV;
244 }
245 }
246 spin_unlock(&tcon->tc_lock);
247
248 ses = tcon->ses;
249 if (!ses)
250 return -EIO;
251 spin_lock(&ses->ses_lock);
252 if (ses->ses_status == SES_EXITING) {
253 spin_unlock(&ses->ses_lock);
254 return -EIO;
255 }
256 spin_unlock(&ses->ses_lock);
257 if (!ses->server || !server)
258 return -EIO;
259
260 spin_lock(&server->srv_lock);
261 if (server->tcpStatus == CifsNeedReconnect) {
262 /*
263 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
264 * here since they are implicitly done when session drops.
265 */
266 switch (smb2_command) {
267 /*
268 * BB Should we keep oplock break and add flush to exceptions?
269 */
270 case SMB2_TREE_DISCONNECT:
271 case SMB2_CANCEL:
272 case SMB2_CLOSE:
273 case SMB2_OPLOCK_BREAK:
274 spin_unlock(&server->srv_lock);
275 return -EAGAIN;
276 }
277 }
278
279 /* if server is marked for termination, cifsd will cleanup */
280 if (server->terminate) {
281 spin_unlock(&server->srv_lock);
282 return -EHOSTDOWN;
283 }
284 spin_unlock(&server->srv_lock);
285
286 again:
287 rc = cifs_wait_for_server_reconnect(server, tcon->retry);
288 if (rc)
289 return rc;
290
291 spin_lock(&ses->chan_lock);
292 if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
293 spin_unlock(&ses->chan_lock);
294 return 0;
295 }
296 spin_unlock(&ses->chan_lock);
297 cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
298 tcon->ses->chans_need_reconnect,
299 tcon->need_reconnect);
300
301 mutex_lock(&ses->session_mutex);
302 /*
303 * if this is called by delayed work, and the channel has been disabled
304 * in parallel, the delayed work can continue to execute in parallel
305 * there's a chance that this channel may not exist anymore
306 */
307 spin_lock(&server->srv_lock);
308 if (server->tcpStatus == CifsExiting) {
309 spin_unlock(&server->srv_lock);
310 mutex_unlock(&ses->session_mutex);
311 rc = -EHOSTDOWN;
312 goto out;
313 }
314
315 /*
316 * Recheck after acquire mutex. If another thread is negotiating
317 * and the server never sends an answer the socket will be closed
318 * and tcpStatus set to reconnect.
319 */
320 if (server->tcpStatus == CifsNeedReconnect) {
321 spin_unlock(&server->srv_lock);
322 mutex_unlock(&ses->session_mutex);
323
324 if (tcon->retry)
325 goto again;
326
327 rc = -EHOSTDOWN;
328 goto out;
329 }
330 spin_unlock(&server->srv_lock);
331
332 /*
333 * need to prevent multiple threads trying to simultaneously
334 * reconnect the same SMB session
335 */
336 spin_lock(&ses->ses_lock);
337 spin_lock(&ses->chan_lock);
338 if (!cifs_chan_needs_reconnect(ses, server) &&
339 ses->ses_status == SES_GOOD) {
340 spin_unlock(&ses->chan_lock);
341 spin_unlock(&ses->ses_lock);
342 /* this means that we only need to tree connect */
343 if (tcon->need_reconnect)
344 goto skip_sess_setup;
345
346 mutex_unlock(&ses->session_mutex);
347 goto out;
348 }
349 spin_unlock(&ses->chan_lock);
350 spin_unlock(&ses->ses_lock);
351
352 rc = cifs_negotiate_protocol(0, ses, server);
353 if (!rc) {
354 /*
355 * if server stopped supporting multichannel
356 * and the first channel reconnected, disable all the others.
357 */
358 if (ses->chan_count > 1 &&
359 !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
360 rc = cifs_chan_skip_or_disable(ses, server,
361 from_reconnect);
362 if (rc) {
363 mutex_unlock(&ses->session_mutex);
364 goto out;
365 }
366 }
367
368 rc = cifs_setup_session(0, ses, server, ses->local_nls);
369 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
370 /*
371 * Try alternate password for next reconnect (key rotation
372 * could be enabled on the server e.g.) if an alternate
373 * password is available and the current password is expired,
374 * but do not swap on non pwd related errors like host down
375 */
376 if (ses->password2)
377 swap(ses->password2, ses->password);
378 }
379
380 if ((rc == -EACCES) && !tcon->retry) {
381 mutex_unlock(&ses->session_mutex);
382 rc = -EHOSTDOWN;
383 goto failed;
384 } else if (rc) {
385 mutex_unlock(&ses->session_mutex);
386 goto out;
387 }
388 } else {
389 mutex_unlock(&ses->session_mutex);
390 goto out;
391 }
392
393 skip_sess_setup:
394 if (!tcon->need_reconnect) {
395 mutex_unlock(&ses->session_mutex);
396 goto out;
397 }
398 cifs_mark_open_files_invalid(tcon);
399 if (tcon->use_persistent)
400 tcon->need_reopen_files = true;
401
402 rc = cifs_tree_connect(0, tcon);
403
404 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
405 if (rc) {
406 /* If sess reconnected but tcon didn't, something strange ... */
407 mutex_unlock(&ses->session_mutex);
408 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
409 goto out;
410 }
411
412 spin_lock(&ses->ses_lock);
413 if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
414 spin_unlock(&ses->ses_lock);
415 mutex_unlock(&ses->session_mutex);
416 goto skip_add_channels;
417 }
418 ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
419 spin_unlock(&ses->ses_lock);
420
421 if (!rc &&
422 (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
423 server->ops->query_server_interfaces) {
424 mutex_unlock(&ses->session_mutex);
425
426 /*
427 * query server network interfaces, in case they change
428 */
429 xid = get_xid();
430 rc = server->ops->query_server_interfaces(xid, tcon, false);
431 free_xid(xid);
432
433 if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
434 /*
435 * some servers like Azure SMB server do not advertise
436 * that multichannel has been disabled with server
437 * capabilities, rather return STATUS_NOT_IMPLEMENTED.
438 * treat this as server not supporting multichannel
439 */
440
441 rc = cifs_chan_skip_or_disable(ses, server,
442 from_reconnect);
443 goto skip_add_channels;
444 } else if (rc)
445 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
446 __func__, rc);
447
448 if (ses->chan_max > ses->chan_count &&
449 ses->iface_count &&
450 !SERVER_IS_CHAN(server)) {
451 if (ses->chan_count == 1) {
452 cifs_server_dbg(VFS, "supports multichannel now\n");
453 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
454 (SMB_INTERFACE_POLL_INTERVAL * HZ));
455 }
456
457 cifs_try_adding_channels(ses);
458 }
459 } else {
460 mutex_unlock(&ses->session_mutex);
461 }
462
463 skip_add_channels:
464 spin_lock(&ses->ses_lock);
465 ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
466 spin_unlock(&ses->ses_lock);
467
468 if (smb2_command != SMB2_INTERNAL_CMD)
469 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
470
471 atomic_inc(&tconInfoReconnectCount);
472 out:
473 /*
474 * Check if handle based operation so we know whether we can continue
475 * or not without returning to caller to reset file handle.
476 */
477 /*
478 * BB Is flush done by server on drop of tcp session? Should we special
479 * case it and skip above?
480 */
481 switch (smb2_command) {
482 case SMB2_FLUSH:
483 case SMB2_READ:
484 case SMB2_WRITE:
485 case SMB2_LOCK:
486 case SMB2_QUERY_DIRECTORY:
487 case SMB2_CHANGE_NOTIFY:
488 case SMB2_QUERY_INFO:
489 case SMB2_SET_INFO:
490 case SMB2_IOCTL:
491 rc = -EAGAIN;
492 }
493 failed:
494 return rc;
495 }
496
497 static void
498 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
499 struct TCP_Server_Info *server,
500 void *buf,
501 unsigned int *total_len)
502 {
503 struct smb2_pdu *spdu = buf;
504 /* lookup word count ie StructureSize from table */
505 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
506
507 /*
508 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
509 * largest operations (Create)
510 */
511 memset(buf, 0, 256);
512
513 smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
514 spdu->StructureSize2 = cpu_to_le16(parmsize);
515
516 *total_len = parmsize + sizeof(struct smb2_hdr);
517 }
518
519 /*
520 * Allocate and return pointer to an SMB request hdr, and set basic
521 * SMB information in the SMB header. If the return code is zero, this
522 * function must have filled in request_buf pointer.
523 */
524 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
525 struct TCP_Server_Info *server,
526 void **request_buf, unsigned int *total_len)
527 {
528 /* BB eventually switch this to SMB2 specific small buf size */
529 switch (smb2_command) {
530 case SMB2_SET_INFO:
531 case SMB2_QUERY_INFO:
532 *request_buf = cifs_buf_get();
533 break;
534 default:
535 *request_buf = cifs_small_buf_get();
536 break;
537 }
538 if (*request_buf == NULL) {
539 /* BB should we add a retry in here if not a writepage? */
540 return -ENOMEM;
541 }
542
543 fill_small_buf(smb2_command, tcon, server,
544 (struct smb2_hdr *)(*request_buf),
545 total_len);
546
547 if (tcon != NULL) {
548 uint16_t com_code = le16_to_cpu(smb2_command);
549 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
550 cifs_stats_inc(&tcon->num_smbs_sent);
551 }
552
553 return 0;
554 }
555
556 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
557 struct TCP_Server_Info *server,
558 void **request_buf, unsigned int *total_len)
559 {
560 int rc;
561
562 rc = smb2_reconnect(smb2_command, tcon, server, false);
563 if (rc)
564 return rc;
565
566 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
567 total_len);
568 }
569
570 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
571 struct TCP_Server_Info *server,
572 void **request_buf, unsigned int *total_len)
573 {
574 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
575 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
576 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
577 request_buf, total_len);
578 }
579 return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
580 request_buf, total_len);
581 }
582
583 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
584
585 static void
586 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
587 {
588 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
589 pneg_ctxt->DataLength = cpu_to_le16(38);
590 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
591 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
592 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
593 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
594 }
595
596 static void
597 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
598 {
599 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
600 pneg_ctxt->DataLength =
601 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
602 - sizeof(struct smb2_neg_context));
603 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
604 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
605 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
606 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
607 }
608
609 static unsigned int
610 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
611 {
612 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
613 unsigned short num_algs = 1; /* number of signing algorithms sent */
614
615 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
616 /*
617 * Context Data length must be rounded to multiple of 8 for some servers
618 */
619 pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
620 sizeof(struct smb2_neg_context) +
621 (num_algs * sizeof(u16)), 8));
622 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
623 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
624
625 ctxt_len += sizeof(__le16) * num_algs;
626 ctxt_len = ALIGN(ctxt_len, 8);
627 return ctxt_len;
628 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
629 }
630
631 static void
632 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
633 {
634 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
635 if (require_gcm_256) {
636 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
637 pneg_ctxt->CipherCount = cpu_to_le16(1);
638 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
639 } else if (enable_gcm_256) {
640 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
641 pneg_ctxt->CipherCount = cpu_to_le16(3);
642 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
643 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
644 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
645 } else {
646 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
647 pneg_ctxt->CipherCount = cpu_to_le16(2);
648 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
649 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
650 }
651 }
652
653 static unsigned int
654 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
655 {
656 struct nls_table *cp = load_nls_default();
657
658 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
659
660 /* copy up to max of first 100 bytes of server name to NetName field */
661 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
662 /* context size is DataLength + minimal smb2_neg_context */
663 return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
664 }
665
666 static void
667 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
668 {
669 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
670 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
671 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
672 pneg_ctxt->Name[0] = 0x93;
673 pneg_ctxt->Name[1] = 0xAD;
674 pneg_ctxt->Name[2] = 0x25;
675 pneg_ctxt->Name[3] = 0x50;
676 pneg_ctxt->Name[4] = 0x9C;
677 pneg_ctxt->Name[5] = 0xB4;
678 pneg_ctxt->Name[6] = 0x11;
679 pneg_ctxt->Name[7] = 0xE7;
680 pneg_ctxt->Name[8] = 0xB4;
681 pneg_ctxt->Name[9] = 0x23;
682 pneg_ctxt->Name[10] = 0x83;
683 pneg_ctxt->Name[11] = 0xDE;
684 pneg_ctxt->Name[12] = 0x96;
685 pneg_ctxt->Name[13] = 0x8B;
686 pneg_ctxt->Name[14] = 0xCD;
687 pneg_ctxt->Name[15] = 0x7C;
688 }
689
690 static void
691 assemble_neg_contexts(struct smb2_negotiate_req *req,
692 struct TCP_Server_Info *server, unsigned int *total_len)
693 {
694 unsigned int ctxt_len, neg_context_count;
695 struct TCP_Server_Info *pserver;
696 char *pneg_ctxt;
697 char *hostname;
698
699 if (*total_len > 200) {
700 /* In case length corrupted don't want to overrun smb buffer */
701 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
702 return;
703 }
704
705 /*
706 * round up total_len of fixed part of SMB3 negotiate request to 8
707 * byte boundary before adding negotiate contexts
708 */
709 *total_len = ALIGN(*total_len, 8);
710
711 pneg_ctxt = (*total_len) + (char *)req;
712 req->NegotiateContextOffset = cpu_to_le32(*total_len);
713
714 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
715 ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
716 *total_len += ctxt_len;
717 pneg_ctxt += ctxt_len;
718
719 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
720 ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
721 *total_len += ctxt_len;
722 pneg_ctxt += ctxt_len;
723
724 /*
725 * secondary channels don't have the hostname field populated
726 * use the hostname field in the primary channel instead
727 */
728 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
729 cifs_server_lock(pserver);
730 hostname = pserver->hostname;
731 if (hostname && (hostname[0] != 0)) {
732 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
733 hostname);
734 *total_len += ctxt_len;
735 pneg_ctxt += ctxt_len;
736 neg_context_count = 3;
737 } else
738 neg_context_count = 2;
739 cifs_server_unlock(pserver);
740
741 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
742 *total_len += sizeof(struct smb2_posix_neg_context);
743 pneg_ctxt += sizeof(struct smb2_posix_neg_context);
744 neg_context_count++;
745
746 if (server->compression.requested) {
747 build_compression_ctxt((struct smb2_compression_capabilities_context *)
748 pneg_ctxt);
749 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
750 *total_len += ctxt_len;
751 pneg_ctxt += ctxt_len;
752 neg_context_count++;
753 }
754
755 if (enable_negotiate_signing) {
756 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
757 pneg_ctxt);
758 *total_len += ctxt_len;
759 pneg_ctxt += ctxt_len;
760 neg_context_count++;
761 }
762
763 /* check for and add transport_capabilities and signing capabilities */
764 req->NegotiateContextCount = cpu_to_le16(neg_context_count);
765
766 }
767
768 /* If invalid preauth context warn but use what we requested, SHA-512 */
769 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
770 {
771 unsigned int len = le16_to_cpu(ctxt->DataLength);
772
773 /*
774 * Caller checked that DataLength remains within SMB boundary. We still
775 * need to confirm that one HashAlgorithms member is accounted for.
776 */
777 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
778 pr_warn_once("server sent bad preauth context\n");
779 return;
780 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
781 pr_warn_once("server sent invalid SaltLength\n");
782 return;
783 }
784 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
785 pr_warn_once("Invalid SMB3 hash algorithm count\n");
786 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
787 pr_warn_once("unknown SMB3 hash algorithm\n");
788 }
789
790 static void decode_compress_ctx(struct TCP_Server_Info *server,
791 struct smb2_compression_capabilities_context *ctxt)
792 {
793 unsigned int len = le16_to_cpu(ctxt->DataLength);
794 __le16 alg;
795
796 server->compression.enabled = false;
797
798 /*
799 * Caller checked that DataLength remains within SMB boundary. We still
800 * need to confirm that one CompressionAlgorithms member is accounted
801 * for.
802 */
803 if (len < 10) {
804 pr_warn_once("server sent bad compression cntxt\n");
805 return;
806 }
807
808 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
809 pr_warn_once("invalid SMB3 compress algorithm count\n");
810 return;
811 }
812
813 alg = ctxt->CompressionAlgorithms[0];
814
815 /* 'NONE' (0) compressor type is never negotiated */
816 if (alg == 0 || le16_to_cpu(alg) > 3) {
817 pr_warn_once("invalid compression algorithm '%u'\n", alg);
818 return;
819 }
820
821 server->compression.alg = alg;
822 server->compression.enabled = true;
823 }
824
825 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
826 struct smb2_encryption_neg_context *ctxt)
827 {
828 unsigned int len = le16_to_cpu(ctxt->DataLength);
829
830 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
831 /*
832 * Caller checked that DataLength remains within SMB boundary. We still
833 * need to confirm that one Cipher flexible array member is accounted
834 * for.
835 */
836 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
837 pr_warn_once("server sent bad crypto ctxt len\n");
838 return -EINVAL;
839 }
840
841 if (le16_to_cpu(ctxt->CipherCount) != 1) {
842 pr_warn_once("Invalid SMB3.11 cipher count\n");
843 return -EINVAL;
844 }
845 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
846 if (require_gcm_256) {
847 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
848 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
849 return -EOPNOTSUPP;
850 }
851 } else if (ctxt->Ciphers[0] == 0) {
852 /*
853 * e.g. if server only supported AES256_CCM (very unlikely)
854 * or server supported no encryption types or had all disabled.
855 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
856 * in which mount requested encryption ("seal") checks later
857 * on during tree connection will return proper rc, but if
858 * seal not requested by client, since server is allowed to
859 * return 0 to indicate no supported cipher, we can't fail here
860 */
861 server->cipher_type = 0;
862 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
863 pr_warn_once("Server does not support requested encryption types\n");
864 return 0;
865 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
866 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
867 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
868 /* server returned a cipher we didn't ask for */
869 pr_warn_once("Invalid SMB3.11 cipher returned\n");
870 return -EINVAL;
871 }
872 server->cipher_type = ctxt->Ciphers[0];
873 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
874 return 0;
875 }
876
877 static void decode_signing_ctx(struct TCP_Server_Info *server,
878 struct smb2_signing_capabilities *pctxt)
879 {
880 unsigned int len = le16_to_cpu(pctxt->DataLength);
881
882 /*
883 * Caller checked that DataLength remains within SMB boundary. We still
884 * need to confirm that one SigningAlgorithms flexible array member is
885 * accounted for.
886 */
887 if ((len < 4) || (len > 16)) {
888 pr_warn_once("server sent bad signing negcontext\n");
889 return;
890 }
891 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
892 pr_warn_once("Invalid signing algorithm count\n");
893 return;
894 }
895 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
896 pr_warn_once("unknown signing algorithm\n");
897 return;
898 }
899
900 server->signing_negotiated = true;
901 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
902 cifs_dbg(FYI, "signing algorithm %d chosen\n",
903 server->signing_algorithm);
904 }
905
906
907 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
908 struct TCP_Server_Info *server,
909 unsigned int len_of_smb)
910 {
911 struct smb2_neg_context *pctx;
912 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
913 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
914 unsigned int len_of_ctxts, i;
915 int rc = 0;
916
917 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
918 if (len_of_smb <= offset) {
919 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
920 return -EINVAL;
921 }
922
923 len_of_ctxts = len_of_smb - offset;
924
925 for (i = 0; i < ctxt_cnt; i++) {
926 int clen;
927 /* check that offset is not beyond end of SMB */
928 if (len_of_ctxts < sizeof(struct smb2_neg_context))
929 break;
930
931 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
932 clen = sizeof(struct smb2_neg_context)
933 + le16_to_cpu(pctx->DataLength);
934 /*
935 * 2.2.4 SMB2 NEGOTIATE Response
936 * Subsequent negotiate contexts MUST appear at the first 8-byte
937 * aligned offset following the previous negotiate context.
938 */
939 if (i + 1 != ctxt_cnt)
940 clen = ALIGN(clen, 8);
941 if (clen > len_of_ctxts)
942 break;
943
944 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
945 decode_preauth_context(
946 (struct smb2_preauth_neg_context *)pctx);
947 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
948 rc = decode_encrypt_ctx(server,
949 (struct smb2_encryption_neg_context *)pctx);
950 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
951 decode_compress_ctx(server,
952 (struct smb2_compression_capabilities_context *)pctx);
953 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
954 server->posix_ext_supported = true;
955 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
956 decode_signing_ctx(server,
957 (struct smb2_signing_capabilities *)pctx);
958 else
959 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
960 le16_to_cpu(pctx->ContextType));
961 if (rc)
962 break;
963
964 offset += clen;
965 len_of_ctxts -= clen;
966 }
967 return rc;
968 }
969
970 static struct create_posix *
971 create_posix_buf(umode_t mode)
972 {
973 struct create_posix *buf;
974
975 buf = kzalloc(sizeof(struct create_posix),
976 GFP_KERNEL);
977 if (!buf)
978 return NULL;
979
980 buf->ccontext.DataOffset =
981 cpu_to_le16(offsetof(struct create_posix, Mode));
982 buf->ccontext.DataLength = cpu_to_le32(4);
983 buf->ccontext.NameOffset =
984 cpu_to_le16(offsetof(struct create_posix, Name));
985 buf->ccontext.NameLength = cpu_to_le16(16);
986
987 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
988 buf->Name[0] = 0x93;
989 buf->Name[1] = 0xAD;
990 buf->Name[2] = 0x25;
991 buf->Name[3] = 0x50;
992 buf->Name[4] = 0x9C;
993 buf->Name[5] = 0xB4;
994 buf->Name[6] = 0x11;
995 buf->Name[7] = 0xE7;
996 buf->Name[8] = 0xB4;
997 buf->Name[9] = 0x23;
998 buf->Name[10] = 0x83;
999 buf->Name[11] = 0xDE;
1000 buf->Name[12] = 0x96;
1001 buf->Name[13] = 0x8B;
1002 buf->Name[14] = 0xCD;
1003 buf->Name[15] = 0x7C;
1004 buf->Mode = cpu_to_le32(mode);
1005 cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
1006 return buf;
1007 }
1008
1009 static int
1010 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1011 {
1012 unsigned int num = *num_iovec;
1013
1014 iov[num].iov_base = create_posix_buf(mode);
1015 if (mode == ACL_NO_MODE)
1016 cifs_dbg(FYI, "%s: no mode\n", __func__);
1017 if (iov[num].iov_base == NULL)
1018 return -ENOMEM;
1019 iov[num].iov_len = sizeof(struct create_posix);
1020 *num_iovec = num + 1;
1021 return 0;
1022 }
1023
1024
1025 /*
1026 *
1027 * SMB2 Worker functions follow:
1028 *
1029 * The general structure of the worker functions is:
1030 * 1) Call smb2_init (assembles SMB2 header)
1031 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
1032 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
1033 * 4) Decode SMB2 command specific fields in the fixed length area
1034 * 5) Decode variable length data area (if any for this SMB2 command type)
1035 * 6) Call free smb buffer
1036 * 7) return
1037 *
1038 */
1039
1040 int
1041 SMB2_negotiate(const unsigned int xid,
1042 struct cifs_ses *ses,
1043 struct TCP_Server_Info *server)
1044 {
1045 struct smb_rqst rqst;
1046 struct smb2_negotiate_req *req;
1047 struct smb2_negotiate_rsp *rsp;
1048 struct kvec iov[1];
1049 struct kvec rsp_iov;
1050 int rc;
1051 int resp_buftype;
1052 int blob_offset, blob_length;
1053 char *security_blob;
1054 int flags = CIFS_NEG_OP;
1055 unsigned int total_len;
1056
1057 cifs_dbg(FYI, "Negotiate protocol\n");
1058
1059 if (!server) {
1060 WARN(1, "%s: server is NULL!\n", __func__);
1061 return -EIO;
1062 }
1063
1064 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1065 (void **) &req, &total_len);
1066 if (rc)
1067 return rc;
1068
1069 req->hdr.SessionId = 0;
1070
1071 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1072 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1073
1074 if (strcmp(server->vals->version_string,
1075 SMB3ANY_VERSION_STRING) == 0) {
1076 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1077 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1078 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1079 req->DialectCount = cpu_to_le16(3);
1080 total_len += 6;
1081 } else if (strcmp(server->vals->version_string,
1082 SMBDEFAULT_VERSION_STRING) == 0) {
1083 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1084 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1085 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1086 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1087 req->DialectCount = cpu_to_le16(4);
1088 total_len += 8;
1089 } else {
1090 /* otherwise send specific dialect */
1091 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1092 req->DialectCount = cpu_to_le16(1);
1093 total_len += 2;
1094 }
1095
1096 /* only one of SMB2 signing flags may be set in SMB2 request */
1097 if (ses->sign)
1098 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1099 else if (global_secflags & CIFSSEC_MAY_SIGN)
1100 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1101 else
1102 req->SecurityMode = 0;
1103
1104 req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1105 if (ses->chan_max > 1)
1106 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1107
1108 /* ClientGUID must be zero for SMB2.02 dialect */
1109 if (server->vals->protocol_id == SMB20_PROT_ID)
1110 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1111 else {
1112 memcpy(req->ClientGUID, server->client_guid,
1113 SMB2_CLIENT_GUID_SIZE);
1114 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1115 (strcmp(server->vals->version_string,
1116 SMB3ANY_VERSION_STRING) == 0) ||
1117 (strcmp(server->vals->version_string,
1118 SMBDEFAULT_VERSION_STRING) == 0))
1119 assemble_neg_contexts(req, server, &total_len);
1120 }
1121 iov[0].iov_base = (char *)req;
1122 iov[0].iov_len = total_len;
1123
1124 memset(&rqst, 0, sizeof(struct smb_rqst));
1125 rqst.rq_iov = iov;
1126 rqst.rq_nvec = 1;
1127
1128 rc = cifs_send_recv(xid, ses, server,
1129 &rqst, &resp_buftype, flags, &rsp_iov);
1130 cifs_small_buf_release(req);
1131 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1132 /*
1133 * No tcon so can't do
1134 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1135 */
1136 if (rc == -EOPNOTSUPP) {
1137 cifs_server_dbg(VFS, "Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
1138 goto neg_exit;
1139 } else if (rc != 0)
1140 goto neg_exit;
1141
1142 rc = -EIO;
1143 if (strcmp(server->vals->version_string,
1144 SMB3ANY_VERSION_STRING) == 0) {
1145 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1146 cifs_server_dbg(VFS,
1147 "SMB2 dialect returned but not requested\n");
1148 goto neg_exit;
1149 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1150 cifs_server_dbg(VFS,
1151 "SMB2.1 dialect returned but not requested\n");
1152 goto neg_exit;
1153 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1154 /* ops set to 3.0 by default for default so update */
1155 server->ops = &smb311_operations;
1156 server->vals = &smb311_values;
1157 }
1158 } else if (strcmp(server->vals->version_string,
1159 SMBDEFAULT_VERSION_STRING) == 0) {
1160 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1161 cifs_server_dbg(VFS,
1162 "SMB2 dialect returned but not requested\n");
1163 goto neg_exit;
1164 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1165 /* ops set to 3.0 by default for default so update */
1166 server->ops = &smb21_operations;
1167 server->vals = &smb21_values;
1168 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1169 server->ops = &smb311_operations;
1170 server->vals = &smb311_values;
1171 }
1172 } else if (le16_to_cpu(rsp->DialectRevision) !=
1173 server->vals->protocol_id) {
1174 /* if requested single dialect ensure returned dialect matched */
1175 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1176 le16_to_cpu(rsp->DialectRevision));
1177 goto neg_exit;
1178 }
1179
1180 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1181
1182 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1183 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1184 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1185 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1186 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1187 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1188 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1189 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1190 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1191 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1192 else {
1193 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1194 le16_to_cpu(rsp->DialectRevision));
1195 goto neg_exit;
1196 }
1197
1198 rc = 0;
1199 server->dialect = le16_to_cpu(rsp->DialectRevision);
1200
1201 /*
1202 * Keep a copy of the hash after negprot. This hash will be
1203 * the starting hash value for all sessions made from this
1204 * server.
1205 */
1206 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1207 SMB2_PREAUTH_HASH_SIZE);
1208
1209 /* SMB2 only has an extended negflavor */
1210 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1211 /* set it to the maximum buffer size value we can send with 1 credit */
1212 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1213 SMB2_MAX_BUFFER_SIZE);
1214 server->max_read = le32_to_cpu(rsp->MaxReadSize);
1215 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1216 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1217 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1218 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1219 server->sec_mode);
1220 server->capabilities = le32_to_cpu(rsp->Capabilities);
1221 /* Internal types */
1222 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1223
1224 /*
1225 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1226 * Set the cipher type manually.
1227 */
1228 if ((server->dialect == SMB30_PROT_ID ||
1229 server->dialect == SMB302_PROT_ID) &&
1230 (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1231 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1232
1233 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1234 (struct smb2_hdr *)rsp);
1235 /*
1236 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1237 * for us will be
1238 * ses->sectype = RawNTLMSSP;
1239 * but for time being this is our only auth choice so doesn't matter.
1240 * We just found a server which sets blob length to zero expecting raw.
1241 */
1242 if (blob_length == 0) {
1243 cifs_dbg(FYI, "missing security blob on negprot\n");
1244 server->sec_ntlmssp = true;
1245 }
1246
1247 rc = cifs_enable_signing(server, ses->sign);
1248 if (rc)
1249 goto neg_exit;
1250 if (blob_length) {
1251 rc = decode_negTokenInit(security_blob, blob_length, server);
1252 if (rc == 1)
1253 rc = 0;
1254 else if (rc == 0)
1255 rc = -EIO;
1256 }
1257
1258 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1259 if (rsp->NegotiateContextCount)
1260 rc = smb311_decode_neg_context(rsp, server,
1261 rsp_iov.iov_len);
1262 else
1263 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1264 }
1265
1266 if (server->cipher_type && !rc) {
1267 if (!SERVER_IS_CHAN(server)) {
1268 rc = smb3_crypto_aead_allocate(server);
1269 } else {
1270 /* For channels, just reuse the primary server crypto secmech. */
1271 server->secmech.enc = server->primary_server->secmech.enc;
1272 server->secmech.dec = server->primary_server->secmech.dec;
1273 }
1274 }
1275 neg_exit:
1276 free_rsp_buf(resp_buftype, rsp);
1277 return rc;
1278 }
1279
1280 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1281 {
1282 int rc;
1283 struct validate_negotiate_info_req *pneg_inbuf;
1284 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1285 u32 rsplen;
1286 u32 inbuflen; /* max of 4 dialects */
1287 struct TCP_Server_Info *server = tcon->ses->server;
1288
1289 cifs_dbg(FYI, "validate negotiate\n");
1290
1291 /* In SMB3.11 preauth integrity supersedes validate negotiate */
1292 if (server->dialect == SMB311_PROT_ID)
1293 return 0;
1294
1295 /*
1296 * validation ioctl must be signed, so no point sending this if we
1297 * can not sign it (ie are not known user). Even if signing is not
1298 * required (enabled but not negotiated), in those cases we selectively
1299 * sign just this, the first and only signed request on a connection.
1300 * Having validation of negotiate info helps reduce attack vectors.
1301 */
1302 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1303 return 0; /* validation requires signing */
1304
1305 if (tcon->ses->user_name == NULL) {
1306 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1307 return 0; /* validation requires signing */
1308 }
1309
1310 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1311 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1312
1313 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1314 if (!pneg_inbuf)
1315 return -ENOMEM;
1316
1317 pneg_inbuf->Capabilities =
1318 cpu_to_le32(server->vals->req_capabilities);
1319 if (tcon->ses->chan_max > 1)
1320 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1321
1322 memcpy(pneg_inbuf->Guid, server->client_guid,
1323 SMB2_CLIENT_GUID_SIZE);
1324
1325 if (tcon->ses->sign)
1326 pneg_inbuf->SecurityMode =
1327 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1328 else if (global_secflags & CIFSSEC_MAY_SIGN)
1329 pneg_inbuf->SecurityMode =
1330 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1331 else
1332 pneg_inbuf->SecurityMode = 0;
1333
1334
1335 if (strcmp(server->vals->version_string,
1336 SMB3ANY_VERSION_STRING) == 0) {
1337 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1338 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1339 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1340 pneg_inbuf->DialectCount = cpu_to_le16(3);
1341 /* SMB 2.1 not included so subtract one dialect from len */
1342 inbuflen = sizeof(*pneg_inbuf) -
1343 (sizeof(pneg_inbuf->Dialects[0]));
1344 } else if (strcmp(server->vals->version_string,
1345 SMBDEFAULT_VERSION_STRING) == 0) {
1346 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1347 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1348 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1349 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1350 pneg_inbuf->DialectCount = cpu_to_le16(4);
1351 /* structure is big enough for 4 dialects */
1352 inbuflen = sizeof(*pneg_inbuf);
1353 } else {
1354 /* otherwise specific dialect was requested */
1355 pneg_inbuf->Dialects[0] =
1356 cpu_to_le16(server->vals->protocol_id);
1357 pneg_inbuf->DialectCount = cpu_to_le16(1);
1358 /* structure is big enough for 4 dialects, sending only 1 */
1359 inbuflen = sizeof(*pneg_inbuf) -
1360 sizeof(pneg_inbuf->Dialects[0]) * 3;
1361 }
1362
1363 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1364 FSCTL_VALIDATE_NEGOTIATE_INFO,
1365 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1366 (char **)&pneg_rsp, &rsplen);
1367 if (rc == -EOPNOTSUPP) {
1368 /*
1369 * Old Windows versions or Netapp SMB server can return
1370 * not supported error. Client should accept it.
1371 */
1372 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1373 rc = 0;
1374 goto out_free_inbuf;
1375 } else if (rc != 0) {
1376 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1377 rc);
1378 rc = -EIO;
1379 goto out_free_inbuf;
1380 }
1381
1382 rc = -EIO;
1383 if (rsplen != sizeof(*pneg_rsp)) {
1384 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1385 rsplen);
1386
1387 /* relax check since Mac returns max bufsize allowed on ioctl */
1388 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1389 goto out_free_rsp;
1390 }
1391
1392 /* check validate negotiate info response matches what we got earlier */
1393 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1394 goto vneg_out;
1395
1396 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1397 goto vneg_out;
1398
1399 /* do not validate server guid because not saved at negprot time yet */
1400
1401 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1402 SMB2_LARGE_FILES) != server->capabilities)
1403 goto vneg_out;
1404
1405 /* validate negotiate successful */
1406 rc = 0;
1407 cifs_dbg(FYI, "validate negotiate info successful\n");
1408 goto out_free_rsp;
1409
1410 vneg_out:
1411 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1412 out_free_rsp:
1413 kfree(pneg_rsp);
1414 out_free_inbuf:
1415 kfree(pneg_inbuf);
1416 return rc;
1417 }
1418
1419 enum securityEnum
1420 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1421 {
1422 switch (requested) {
1423 case Kerberos:
1424 case RawNTLMSSP:
1425 return requested;
1426 case NTLMv2:
1427 return RawNTLMSSP;
1428 case Unspecified:
1429 if (server->sec_ntlmssp &&
1430 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1431 return RawNTLMSSP;
1432 if ((server->sec_kerberos || server->sec_mskerberos) &&
1433 (global_secflags & CIFSSEC_MAY_KRB5))
1434 return Kerberos;
1435 fallthrough;
1436 default:
1437 return Unspecified;
1438 }
1439 }
1440
1441 struct SMB2_sess_data {
1442 unsigned int xid;
1443 struct cifs_ses *ses;
1444 struct TCP_Server_Info *server;
1445 struct nls_table *nls_cp;
1446 void (*func)(struct SMB2_sess_data *);
1447 int result;
1448 u64 previous_session;
1449
1450 /* we will send the SMB in three pieces:
1451 * a fixed length beginning part, an optional
1452 * SPNEGO blob (which can be zero length), and a
1453 * last part which will include the strings
1454 * and rest of bcc area. This allows us to avoid
1455 * a large buffer 17K allocation
1456 */
1457 int buf0_type;
1458 struct kvec iov[2];
1459 };
1460
1461 static int
1462 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1463 {
1464 int rc;
1465 struct cifs_ses *ses = sess_data->ses;
1466 struct TCP_Server_Info *server = sess_data->server;
1467 struct smb2_sess_setup_req *req;
1468 unsigned int total_len;
1469 bool is_binding = false;
1470
1471 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1472 (void **) &req,
1473 &total_len);
1474 if (rc)
1475 return rc;
1476
1477 spin_lock(&ses->ses_lock);
1478 is_binding = (ses->ses_status == SES_GOOD);
1479 spin_unlock(&ses->ses_lock);
1480
1481 if (is_binding) {
1482 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1483 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1484 req->PreviousSessionId = 0;
1485 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1486 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1487 } else {
1488 /* First session, not a reauthenticate */
1489 req->hdr.SessionId = 0;
1490 /*
1491 * if reconnect, we need to send previous sess id
1492 * otherwise it is 0
1493 */
1494 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1495 req->Flags = 0; /* MBZ */
1496 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1497 sess_data->previous_session);
1498 }
1499
1500 /* enough to enable echos and oplocks and one max size write */
1501 if (server->credits >= server->max_credits)
1502 req->hdr.CreditRequest = cpu_to_le16(0);
1503 else
1504 req->hdr.CreditRequest = cpu_to_le16(
1505 min_t(int, server->max_credits -
1506 server->credits, 130));
1507
1508 /* only one of SMB2 signing flags may be set in SMB2 request */
1509 if (server->sign)
1510 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1511 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1512 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1513 else
1514 req->SecurityMode = 0;
1515
1516 #ifdef CONFIG_CIFS_DFS_UPCALL
1517 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1518 #else
1519 req->Capabilities = 0;
1520 #endif /* DFS_UPCALL */
1521
1522 req->Channel = 0; /* MBZ */
1523
1524 sess_data->iov[0].iov_base = (char *)req;
1525 /* 1 for pad */
1526 sess_data->iov[0].iov_len = total_len - 1;
1527 /*
1528 * This variable will be used to clear the buffer
1529 * allocated above in case of any error in the calling function.
1530 */
1531 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1532
1533 return 0;
1534 }
1535
1536 static void
1537 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1538 {
1539 struct kvec *iov = sess_data->iov;
1540
1541 /* iov[1] is already freed by caller */
1542 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1543 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1544
1545 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1546 sess_data->buf0_type = CIFS_NO_BUFFER;
1547 }
1548
1549 static int
1550 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1551 {
1552 int rc;
1553 struct smb_rqst rqst;
1554 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1555 struct kvec rsp_iov = { NULL, 0 };
1556
1557 /* Testing shows that buffer offset must be at location of Buffer[0] */
1558 req->SecurityBufferOffset =
1559 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1560 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1561
1562 memset(&rqst, 0, sizeof(struct smb_rqst));
1563 rqst.rq_iov = sess_data->iov;
1564 rqst.rq_nvec = 2;
1565
1566 /* BB add code to build os and lm fields */
1567 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1568 sess_data->server,
1569 &rqst,
1570 &sess_data->buf0_type,
1571 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1572 cifs_small_buf_release(sess_data->iov[0].iov_base);
1573 if (rc == 0)
1574 sess_data->ses->expired_pwd = false;
1575 else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
1576 if (sess_data->ses->expired_pwd == false)
1577 trace_smb3_key_expired(sess_data->server->hostname,
1578 sess_data->ses->user_name,
1579 sess_data->server->conn_id,
1580 &sess_data->server->dstaddr, rc);
1581 sess_data->ses->expired_pwd = true;
1582 }
1583
1584 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1585
1586 return rc;
1587 }
1588
1589 static int
1590 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1591 {
1592 int rc = 0;
1593 struct cifs_ses *ses = sess_data->ses;
1594 struct TCP_Server_Info *server = sess_data->server;
1595
1596 cifs_server_lock(server);
1597 if (server->ops->generate_signingkey) {
1598 rc = server->ops->generate_signingkey(ses, server);
1599 if (rc) {
1600 cifs_dbg(FYI,
1601 "SMB3 session key generation failed\n");
1602 cifs_server_unlock(server);
1603 return rc;
1604 }
1605 }
1606 if (!server->session_estab) {
1607 server->sequence_number = 0x2;
1608 server->session_estab = true;
1609 }
1610 cifs_server_unlock(server);
1611
1612 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1613 return rc;
1614 }
1615
1616 #ifdef CONFIG_CIFS_UPCALL
1617 static void
1618 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1619 {
1620 int rc;
1621 struct cifs_ses *ses = sess_data->ses;
1622 struct TCP_Server_Info *server = sess_data->server;
1623 struct cifs_spnego_msg *msg;
1624 struct key *spnego_key = NULL;
1625 struct smb2_sess_setup_rsp *rsp = NULL;
1626 bool is_binding = false;
1627
1628 rc = SMB2_sess_alloc_buffer(sess_data);
1629 if (rc)
1630 goto out;
1631
1632 spnego_key = cifs_get_spnego_key(ses, server);
1633 if (IS_ERR(spnego_key)) {
1634 rc = PTR_ERR(spnego_key);
1635 if (rc == -ENOKEY)
1636 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1637 spnego_key = NULL;
1638 goto out;
1639 }
1640
1641 msg = spnego_key->payload.data[0];
1642 /*
1643 * check version field to make sure that cifs.upcall is
1644 * sending us a response in an expected form
1645 */
1646 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1647 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1648 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1649 rc = -EKEYREJECTED;
1650 goto out_put_spnego_key;
1651 }
1652
1653 spin_lock(&ses->ses_lock);
1654 is_binding = (ses->ses_status == SES_GOOD);
1655 spin_unlock(&ses->ses_lock);
1656
1657 /* keep session key if binding */
1658 if (!is_binding) {
1659 kfree_sensitive(ses->auth_key.response);
1660 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1661 GFP_KERNEL);
1662 if (!ses->auth_key.response) {
1663 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1664 msg->sesskey_len);
1665 rc = -ENOMEM;
1666 goto out_put_spnego_key;
1667 }
1668 ses->auth_key.len = msg->sesskey_len;
1669 }
1670
1671 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1672 sess_data->iov[1].iov_len = msg->secblob_len;
1673
1674 rc = SMB2_sess_sendreceive(sess_data);
1675 if (rc)
1676 goto out_put_spnego_key;
1677
1678 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1679 /* keep session id and flags if binding */
1680 if (!is_binding) {
1681 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1682 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1683 }
1684
1685 rc = SMB2_sess_establish_session(sess_data);
1686 out_put_spnego_key:
1687 key_invalidate(spnego_key);
1688 key_put(spnego_key);
1689 if (rc) {
1690 kfree_sensitive(ses->auth_key.response);
1691 ses->auth_key.response = NULL;
1692 ses->auth_key.len = 0;
1693 }
1694 out:
1695 sess_data->result = rc;
1696 sess_data->func = NULL;
1697 SMB2_sess_free_buffer(sess_data);
1698 }
1699 #else
1700 static void
1701 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1702 {
1703 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1704 sess_data->result = -EOPNOTSUPP;
1705 sess_data->func = NULL;
1706 }
1707 #endif
1708
1709 static void
1710 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1711
1712 static void
1713 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1714 {
1715 int rc;
1716 struct cifs_ses *ses = sess_data->ses;
1717 struct TCP_Server_Info *server = sess_data->server;
1718 struct smb2_sess_setup_rsp *rsp = NULL;
1719 unsigned char *ntlmssp_blob = NULL;
1720 bool use_spnego = false; /* else use raw ntlmssp */
1721 u16 blob_length = 0;
1722 bool is_binding = false;
1723
1724 /*
1725 * If memory allocation is successful, caller of this function
1726 * frees it.
1727 */
1728 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1729 if (!ses->ntlmssp) {
1730 rc = -ENOMEM;
1731 goto out_err;
1732 }
1733 ses->ntlmssp->sesskey_per_smbsess = true;
1734
1735 rc = SMB2_sess_alloc_buffer(sess_data);
1736 if (rc)
1737 goto out_err;
1738
1739 rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1740 &blob_length, ses, server,
1741 sess_data->nls_cp);
1742 if (rc)
1743 goto out;
1744
1745 if (use_spnego) {
1746 /* BB eventually need to add this */
1747 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1748 rc = -EOPNOTSUPP;
1749 goto out;
1750 }
1751 sess_data->iov[1].iov_base = ntlmssp_blob;
1752 sess_data->iov[1].iov_len = blob_length;
1753
1754 rc = SMB2_sess_sendreceive(sess_data);
1755 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1756
1757 /* If true, rc here is expected and not an error */
1758 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1759 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1760 rc = 0;
1761
1762 if (rc)
1763 goto out;
1764
1765 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1766 le16_to_cpu(rsp->SecurityBufferOffset)) {
1767 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1768 le16_to_cpu(rsp->SecurityBufferOffset));
1769 rc = -EIO;
1770 goto out;
1771 }
1772 rc = decode_ntlmssp_challenge(rsp->Buffer,
1773 le16_to_cpu(rsp->SecurityBufferLength), ses);
1774 if (rc)
1775 goto out;
1776
1777 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1778
1779 spin_lock(&ses->ses_lock);
1780 is_binding = (ses->ses_status == SES_GOOD);
1781 spin_unlock(&ses->ses_lock);
1782
1783 /* keep existing ses id and flags if binding */
1784 if (!is_binding) {
1785 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1786 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1787 }
1788
1789 out:
1790 kfree_sensitive(ntlmssp_blob);
1791 SMB2_sess_free_buffer(sess_data);
1792 if (!rc) {
1793 sess_data->result = 0;
1794 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1795 return;
1796 }
1797 out_err:
1798 kfree_sensitive(ses->ntlmssp);
1799 ses->ntlmssp = NULL;
1800 sess_data->result = rc;
1801 sess_data->func = NULL;
1802 }
1803
1804 static void
1805 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1806 {
1807 int rc;
1808 struct cifs_ses *ses = sess_data->ses;
1809 struct TCP_Server_Info *server = sess_data->server;
1810 struct smb2_sess_setup_req *req;
1811 struct smb2_sess_setup_rsp *rsp = NULL;
1812 unsigned char *ntlmssp_blob = NULL;
1813 bool use_spnego = false; /* else use raw ntlmssp */
1814 u16 blob_length = 0;
1815 bool is_binding = false;
1816
1817 rc = SMB2_sess_alloc_buffer(sess_data);
1818 if (rc)
1819 goto out;
1820
1821 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1822 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1823
1824 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1825 ses, server,
1826 sess_data->nls_cp);
1827 if (rc) {
1828 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1829 goto out;
1830 }
1831
1832 if (use_spnego) {
1833 /* BB eventually need to add this */
1834 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1835 rc = -EOPNOTSUPP;
1836 goto out;
1837 }
1838 sess_data->iov[1].iov_base = ntlmssp_blob;
1839 sess_data->iov[1].iov_len = blob_length;
1840
1841 rc = SMB2_sess_sendreceive(sess_data);
1842 if (rc)
1843 goto out;
1844
1845 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1846
1847 spin_lock(&ses->ses_lock);
1848 is_binding = (ses->ses_status == SES_GOOD);
1849 spin_unlock(&ses->ses_lock);
1850
1851 /* keep existing ses id and flags if binding */
1852 if (!is_binding) {
1853 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1854 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1855 }
1856
1857 rc = SMB2_sess_establish_session(sess_data);
1858 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1859 if (ses->server->dialect < SMB30_PROT_ID) {
1860 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1861 /*
1862 * The session id is opaque in terms of endianness, so we can't
1863 * print it as a long long. we dump it as we got it on the wire
1864 */
1865 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
1866 &ses->Suid);
1867 cifs_dbg(VFS, "Session Key %*ph\n",
1868 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1869 cifs_dbg(VFS, "Signing Key %*ph\n",
1870 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1871 }
1872 #endif
1873 out:
1874 kfree_sensitive(ntlmssp_blob);
1875 SMB2_sess_free_buffer(sess_data);
1876 kfree_sensitive(ses->ntlmssp);
1877 ses->ntlmssp = NULL;
1878 sess_data->result = rc;
1879 sess_data->func = NULL;
1880 }
1881
1882 static int
1883 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1884 {
1885 int type;
1886 struct cifs_ses *ses = sess_data->ses;
1887 struct TCP_Server_Info *server = sess_data->server;
1888
1889 type = smb2_select_sectype(server, ses->sectype);
1890 cifs_dbg(FYI, "sess setup type %d\n", type);
1891 if (type == Unspecified) {
1892 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1893 return -EINVAL;
1894 }
1895
1896 switch (type) {
1897 case Kerberos:
1898 sess_data->func = SMB2_auth_kerberos;
1899 break;
1900 case RawNTLMSSP:
1901 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1902 break;
1903 default:
1904 cifs_dbg(VFS, "secType %d not supported!\n", type);
1905 return -EOPNOTSUPP;
1906 }
1907
1908 return 0;
1909 }
1910
1911 int
1912 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1913 struct TCP_Server_Info *server,
1914 const struct nls_table *nls_cp)
1915 {
1916 int rc = 0;
1917 struct SMB2_sess_data *sess_data;
1918
1919 cifs_dbg(FYI, "Session Setup\n");
1920
1921 if (!server) {
1922 WARN(1, "%s: server is NULL!\n", __func__);
1923 return -EIO;
1924 }
1925
1926 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1927 if (!sess_data)
1928 return -ENOMEM;
1929
1930 sess_data->xid = xid;
1931 sess_data->ses = ses;
1932 sess_data->server = server;
1933 sess_data->buf0_type = CIFS_NO_BUFFER;
1934 sess_data->nls_cp = (struct nls_table *) nls_cp;
1935 sess_data->previous_session = ses->Suid;
1936
1937 rc = SMB2_select_sec(sess_data);
1938 if (rc)
1939 goto out;
1940
1941 /*
1942 * Initialize the session hash with the server one.
1943 */
1944 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1945 SMB2_PREAUTH_HASH_SIZE);
1946
1947 while (sess_data->func)
1948 sess_data->func(sess_data);
1949
1950 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1951 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1952 rc = sess_data->result;
1953 out:
1954 kfree_sensitive(sess_data);
1955 return rc;
1956 }
1957
1958 int
1959 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1960 {
1961 struct smb_rqst rqst;
1962 struct smb2_logoff_req *req; /* response is also trivial struct */
1963 int rc = 0;
1964 struct TCP_Server_Info *server;
1965 int flags = 0;
1966 unsigned int total_len;
1967 struct kvec iov[1];
1968 struct kvec rsp_iov;
1969 int resp_buf_type;
1970
1971 cifs_dbg(FYI, "disconnect session %p\n", ses);
1972
1973 if (ses && (ses->server))
1974 server = ses->server;
1975 else
1976 return -EIO;
1977
1978 /* no need to send SMB logoff if uid already closed due to reconnect */
1979 spin_lock(&ses->chan_lock);
1980 if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1981 spin_unlock(&ses->chan_lock);
1982 goto smb2_session_already_dead;
1983 }
1984 spin_unlock(&ses->chan_lock);
1985
1986 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1987 (void **) &req, &total_len);
1988 if (rc)
1989 return rc;
1990
1991 /* since no tcon, smb2_init can not do this, so do here */
1992 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1993
1994 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1995 flags |= CIFS_TRANSFORM_REQ;
1996 else if (server->sign)
1997 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1998
1999 flags |= CIFS_NO_RSP_BUF;
2000
2001 iov[0].iov_base = (char *)req;
2002 iov[0].iov_len = total_len;
2003
2004 memset(&rqst, 0, sizeof(struct smb_rqst));
2005 rqst.rq_iov = iov;
2006 rqst.rq_nvec = 1;
2007
2008 rc = cifs_send_recv(xid, ses, ses->server,
2009 &rqst, &resp_buf_type, flags, &rsp_iov);
2010 cifs_small_buf_release(req);
2011 /*
2012 * No tcon so can't do
2013 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
2014 */
2015
2016 smb2_session_already_dead:
2017 return rc;
2018 }
2019
2020 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2021 {
2022 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2023 }
2024
2025 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2026
2027 /* These are similar values to what Windows uses */
2028 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2029 {
2030 tcon->max_chunks = 256;
2031 tcon->max_bytes_chunk = 1048576;
2032 tcon->max_bytes_copy = 16777216;
2033 }
2034
2035 int
2036 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2037 struct cifs_tcon *tcon, const struct nls_table *cp)
2038 {
2039 struct smb_rqst rqst;
2040 struct smb2_tree_connect_req *req;
2041 struct smb2_tree_connect_rsp *rsp = NULL;
2042 struct kvec iov[2];
2043 struct kvec rsp_iov = { NULL, 0 };
2044 int rc = 0;
2045 int resp_buftype;
2046 int unc_path_len;
2047 __le16 *unc_path = NULL;
2048 int flags = 0;
2049 unsigned int total_len;
2050 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2051
2052 cifs_dbg(FYI, "TCON\n");
2053
2054 if (!server || !tree)
2055 return -EIO;
2056
2057 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2058 if (unc_path == NULL)
2059 return -ENOMEM;
2060
2061 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2062 if (unc_path_len <= 0) {
2063 kfree(unc_path);
2064 return -EINVAL;
2065 }
2066 unc_path_len *= 2;
2067
2068 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2069 tcon->tid = 0;
2070 atomic_set(&tcon->num_remote_opens, 0);
2071 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2072 (void **) &req, &total_len);
2073 if (rc) {
2074 kfree(unc_path);
2075 return rc;
2076 }
2077
2078 if (smb3_encryption_required(tcon))
2079 flags |= CIFS_TRANSFORM_REQ;
2080
2081 iov[0].iov_base = (char *)req;
2082 /* 1 for pad */
2083 iov[0].iov_len = total_len - 1;
2084
2085 /* Testing shows that buffer offset must be at location of Buffer[0] */
2086 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2087 req->PathLength = cpu_to_le16(unc_path_len);
2088 iov[1].iov_base = unc_path;
2089 iov[1].iov_len = unc_path_len;
2090
2091 /*
2092 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2093 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2094 * (Samba servers don't always set the flag so also check if null user)
2095 */
2096 if ((server->dialect == SMB311_PROT_ID) &&
2097 !smb3_encryption_required(tcon) &&
2098 !(ses->session_flags &
2099 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2100 ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2101 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2102
2103 memset(&rqst, 0, sizeof(struct smb_rqst));
2104 rqst.rq_iov = iov;
2105 rqst.rq_nvec = 2;
2106
2107 /* Need 64 for max size write so ask for more in case not there yet */
2108 if (server->credits >= server->max_credits)
2109 req->hdr.CreditRequest = cpu_to_le16(0);
2110 else
2111 req->hdr.CreditRequest = cpu_to_le16(
2112 min_t(int, server->max_credits -
2113 server->credits, 64));
2114
2115 rc = cifs_send_recv(xid, ses, server,
2116 &rqst, &resp_buftype, flags, &rsp_iov);
2117 cifs_small_buf_release(req);
2118 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2119 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2120 if ((rc != 0) || (rsp == NULL)) {
2121 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2122 tcon->need_reconnect = true;
2123 goto tcon_error_exit;
2124 }
2125
2126 switch (rsp->ShareType) {
2127 case SMB2_SHARE_TYPE_DISK:
2128 cifs_dbg(FYI, "connection to disk share\n");
2129 break;
2130 case SMB2_SHARE_TYPE_PIPE:
2131 tcon->pipe = true;
2132 cifs_dbg(FYI, "connection to pipe share\n");
2133 break;
2134 case SMB2_SHARE_TYPE_PRINT:
2135 tcon->print = true;
2136 cifs_dbg(FYI, "connection to printer\n");
2137 break;
2138 default:
2139 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2140 rc = -EOPNOTSUPP;
2141 goto tcon_error_exit;
2142 }
2143
2144 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2145 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2146 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2147 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2148 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2149
2150 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2151 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2152 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2153
2154 if (tcon->seal &&
2155 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2156 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2157
2158 init_copy_chunk_defaults(tcon);
2159 if (server->ops->validate_negotiate)
2160 rc = server->ops->validate_negotiate(xid, tcon);
2161 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2162 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2163 server->nosharesock = true;
2164 tcon_exit:
2165
2166 free_rsp_buf(resp_buftype, rsp);
2167 kfree(unc_path);
2168 return rc;
2169
2170 tcon_error_exit:
2171 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2172 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
2173 goto tcon_exit;
2174 }
2175
2176 int
2177 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2178 {
2179 struct smb_rqst rqst;
2180 struct smb2_tree_disconnect_req *req; /* response is trivial */
2181 int rc = 0;
2182 struct cifs_ses *ses = tcon->ses;
2183 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2184 int flags = 0;
2185 unsigned int total_len;
2186 struct kvec iov[1];
2187 struct kvec rsp_iov;
2188 int resp_buf_type;
2189
2190 cifs_dbg(FYI, "Tree Disconnect\n");
2191
2192 if (!ses || !(ses->server))
2193 return -EIO;
2194
2195 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2196 spin_lock(&ses->chan_lock);
2197 if ((tcon->need_reconnect) ||
2198 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2199 spin_unlock(&ses->chan_lock);
2200 return 0;
2201 }
2202 spin_unlock(&ses->chan_lock);
2203
2204 invalidate_all_cached_dirs(tcon);
2205
2206 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2207 (void **) &req,
2208 &total_len);
2209 if (rc)
2210 return rc;
2211
2212 if (smb3_encryption_required(tcon))
2213 flags |= CIFS_TRANSFORM_REQ;
2214
2215 flags |= CIFS_NO_RSP_BUF;
2216
2217 iov[0].iov_base = (char *)req;
2218 iov[0].iov_len = total_len;
2219
2220 memset(&rqst, 0, sizeof(struct smb_rqst));
2221 rqst.rq_iov = iov;
2222 rqst.rq_nvec = 1;
2223
2224 rc = cifs_send_recv(xid, ses, server,
2225 &rqst, &resp_buf_type, flags, &rsp_iov);
2226 cifs_small_buf_release(req);
2227 if (rc) {
2228 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2229 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2230 }
2231 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2232
2233 return rc;
2234 }
2235
2236
2237 static struct create_durable *
2238 create_durable_buf(void)
2239 {
2240 struct create_durable *buf;
2241
2242 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2243 if (!buf)
2244 return NULL;
2245
2246 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2247 (struct create_durable, Data));
2248 buf->ccontext.DataLength = cpu_to_le32(16);
2249 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2250 (struct create_durable, Name));
2251 buf->ccontext.NameLength = cpu_to_le16(4);
2252 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2253 buf->Name[0] = 'D';
2254 buf->Name[1] = 'H';
2255 buf->Name[2] = 'n';
2256 buf->Name[3] = 'Q';
2257 return buf;
2258 }
2259
2260 static struct create_durable *
2261 create_reconnect_durable_buf(struct cifs_fid *fid)
2262 {
2263 struct create_durable *buf;
2264
2265 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2266 if (!buf)
2267 return NULL;
2268
2269 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2270 (struct create_durable, Data));
2271 buf->ccontext.DataLength = cpu_to_le32(16);
2272 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2273 (struct create_durable, Name));
2274 buf->ccontext.NameLength = cpu_to_le16(4);
2275 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2276 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2277 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2278 buf->Name[0] = 'D';
2279 buf->Name[1] = 'H';
2280 buf->Name[2] = 'n';
2281 buf->Name[3] = 'C';
2282 return buf;
2283 }
2284
2285 static void
2286 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2287 {
2288 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2289
2290 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2291 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2292 buf->IndexNumber = pdisk_id->DiskFileId;
2293 }
2294
2295 static void
2296 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2297 struct create_posix_rsp *posix)
2298 {
2299 int sid_len;
2300 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2301 u8 *end = beg + le32_to_cpu(cc->DataLength);
2302 u8 *sid;
2303
2304 memset(posix, 0, sizeof(*posix));
2305
2306 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2307 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2308 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2309
2310 sid = beg + 12;
2311 sid_len = posix_info_sid_size(sid, end);
2312 if (sid_len < 0) {
2313 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2314 return;
2315 }
2316 memcpy(&posix->owner, sid, sid_len);
2317
2318 sid = sid + sid_len;
2319 sid_len = posix_info_sid_size(sid, end);
2320 if (sid_len < 0) {
2321 cifs_dbg(VFS, "bad group sid in posix create response\n");
2322 return;
2323 }
2324 memcpy(&posix->group, sid, sid_len);
2325
2326 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2327 posix->nlink, posix->mode, posix->reparse_tag);
2328 }
2329
2330 int smb2_parse_contexts(struct TCP_Server_Info *server,
2331 struct kvec *rsp_iov,
2332 unsigned int *epoch,
2333 char *lease_key, __u8 *oplock,
2334 struct smb2_file_all_info *buf,
2335 struct create_posix_rsp *posix)
2336 {
2337 struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2338 struct create_context *cc;
2339 size_t rem, off, len;
2340 size_t doff, dlen;
2341 size_t noff, nlen;
2342 char *name;
2343 static const char smb3_create_tag_posix[] = {
2344 0x93, 0xAD, 0x25, 0x50, 0x9C,
2345 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2346 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2347 };
2348
2349 *oplock = 0;
2350
2351 off = le32_to_cpu(rsp->CreateContextsOffset);
2352 rem = le32_to_cpu(rsp->CreateContextsLength);
2353 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2354 return -EINVAL;
2355 cc = (struct create_context *)((u8 *)rsp + off);
2356
2357 /* Initialize inode number to 0 in case no valid data in qfid context */
2358 if (buf)
2359 buf->IndexNumber = 0;
2360
2361 while (rem >= sizeof(*cc)) {
2362 doff = le16_to_cpu(cc->DataOffset);
2363 dlen = le32_to_cpu(cc->DataLength);
2364 if (check_add_overflow(doff, dlen, &len) || len > rem)
2365 return -EINVAL;
2366
2367 noff = le16_to_cpu(cc->NameOffset);
2368 nlen = le16_to_cpu(cc->NameLength);
2369 if (noff + nlen > doff)
2370 return -EINVAL;
2371
2372 name = (char *)cc + noff;
2373 switch (nlen) {
2374 case 4:
2375 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2376 *oplock = server->ops->parse_lease_buf(cc, epoch,
2377 lease_key);
2378 } else if (buf &&
2379 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2380 parse_query_id_ctxt(cc, buf);
2381 }
2382 break;
2383 case 16:
2384 if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2385 parse_posix_ctxt(cc, buf, posix);
2386 break;
2387 default:
2388 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2389 __func__, nlen, dlen);
2390 if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2391 cifs_dump_mem("context data: ", cc, dlen);
2392 break;
2393 }
2394
2395 off = le32_to_cpu(cc->Next);
2396 if (!off)
2397 break;
2398 if (check_sub_overflow(rem, off, &rem))
2399 return -EINVAL;
2400 cc = (struct create_context *)((u8 *)cc + off);
2401 }
2402
2403 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2404 *oplock = rsp->OplockLevel;
2405
2406 return 0;
2407 }
2408
2409 static int
2410 add_lease_context(struct TCP_Server_Info *server,
2411 struct smb2_create_req *req,
2412 struct kvec *iov,
2413 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2414 {
2415 unsigned int num = *num_iovec;
2416
2417 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2418 if (iov[num].iov_base == NULL)
2419 return -ENOMEM;
2420 iov[num].iov_len = server->vals->create_lease_size;
2421 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2422 *num_iovec = num + 1;
2423 return 0;
2424 }
2425
2426 static struct create_durable_v2 *
2427 create_durable_v2_buf(struct cifs_open_parms *oparms)
2428 {
2429 struct cifs_fid *pfid = oparms->fid;
2430 struct create_durable_v2 *buf;
2431
2432 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2433 if (!buf)
2434 return NULL;
2435
2436 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2437 (struct create_durable_v2, dcontext));
2438 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2439 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2440 (struct create_durable_v2, Name));
2441 buf->ccontext.NameLength = cpu_to_le16(4);
2442
2443 /*
2444 * NB: Handle timeout defaults to 0, which allows server to choose
2445 * (most servers default to 120 seconds) and most clients default to 0.
2446 * This can be overridden at mount ("handletimeout=") if the user wants
2447 * a different persistent (or resilient) handle timeout for all opens
2448 * on a particular SMB3 mount.
2449 */
2450 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2451 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2452
2453 /* for replay, we should not overwrite the existing create guid */
2454 if (!oparms->replay) {
2455 generate_random_uuid(buf->dcontext.CreateGuid);
2456 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2457 } else
2458 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2459
2460 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2461 buf->Name[0] = 'D';
2462 buf->Name[1] = 'H';
2463 buf->Name[2] = '2';
2464 buf->Name[3] = 'Q';
2465 return buf;
2466 }
2467
2468 static struct create_durable_handle_reconnect_v2 *
2469 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2470 {
2471 struct create_durable_handle_reconnect_v2 *buf;
2472
2473 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2474 GFP_KERNEL);
2475 if (!buf)
2476 return NULL;
2477
2478 buf->ccontext.DataOffset =
2479 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2480 dcontext));
2481 buf->ccontext.DataLength =
2482 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2483 buf->ccontext.NameOffset =
2484 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2485 Name));
2486 buf->ccontext.NameLength = cpu_to_le16(4);
2487
2488 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2489 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2490 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2491 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2492
2493 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2494 buf->Name[0] = 'D';
2495 buf->Name[1] = 'H';
2496 buf->Name[2] = '2';
2497 buf->Name[3] = 'C';
2498 return buf;
2499 }
2500
2501 static int
2502 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2503 struct cifs_open_parms *oparms)
2504 {
2505 unsigned int num = *num_iovec;
2506
2507 iov[num].iov_base = create_durable_v2_buf(oparms);
2508 if (iov[num].iov_base == NULL)
2509 return -ENOMEM;
2510 iov[num].iov_len = sizeof(struct create_durable_v2);
2511 *num_iovec = num + 1;
2512 return 0;
2513 }
2514
2515 static int
2516 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2517 struct cifs_open_parms *oparms)
2518 {
2519 unsigned int num = *num_iovec;
2520
2521 /* indicate that we don't need to relock the file */
2522 oparms->reconnect = false;
2523
2524 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2525 if (iov[num].iov_base == NULL)
2526 return -ENOMEM;
2527 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2528 *num_iovec = num + 1;
2529 return 0;
2530 }
2531
2532 static int
2533 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2534 struct cifs_open_parms *oparms, bool use_persistent)
2535 {
2536 unsigned int num = *num_iovec;
2537
2538 if (use_persistent) {
2539 if (oparms->reconnect)
2540 return add_durable_reconnect_v2_context(iov, num_iovec,
2541 oparms);
2542 else
2543 return add_durable_v2_context(iov, num_iovec, oparms);
2544 }
2545
2546 if (oparms->reconnect) {
2547 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2548 /* indicate that we don't need to relock the file */
2549 oparms->reconnect = false;
2550 } else
2551 iov[num].iov_base = create_durable_buf();
2552 if (iov[num].iov_base == NULL)
2553 return -ENOMEM;
2554 iov[num].iov_len = sizeof(struct create_durable);
2555 *num_iovec = num + 1;
2556 return 0;
2557 }
2558
2559 /* See MS-SMB2 2.2.13.2.7 */
2560 static struct crt_twarp_ctxt *
2561 create_twarp_buf(__u64 timewarp)
2562 {
2563 struct crt_twarp_ctxt *buf;
2564
2565 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2566 if (!buf)
2567 return NULL;
2568
2569 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2570 (struct crt_twarp_ctxt, Timestamp));
2571 buf->ccontext.DataLength = cpu_to_le32(8);
2572 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2573 (struct crt_twarp_ctxt, Name));
2574 buf->ccontext.NameLength = cpu_to_le16(4);
2575 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2576 buf->Name[0] = 'T';
2577 buf->Name[1] = 'W';
2578 buf->Name[2] = 'r';
2579 buf->Name[3] = 'p';
2580 buf->Timestamp = cpu_to_le64(timewarp);
2581 return buf;
2582 }
2583
2584 /* See MS-SMB2 2.2.13.2.7 */
2585 static int
2586 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2587 {
2588 unsigned int num = *num_iovec;
2589
2590 iov[num].iov_base = create_twarp_buf(timewarp);
2591 if (iov[num].iov_base == NULL)
2592 return -ENOMEM;
2593 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2594 *num_iovec = num + 1;
2595 return 0;
2596 }
2597
2598 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2599 static void setup_owner_group_sids(char *buf)
2600 {
2601 struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2602
2603 /* Populate the user ownership fields S-1-5-88-1 */
2604 sids->owner.Revision = 1;
2605 sids->owner.NumAuth = 3;
2606 sids->owner.Authority[5] = 5;
2607 sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2608 sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2609 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2610
2611 /* Populate the group ownership fields S-1-5-88-2 */
2612 sids->group.Revision = 1;
2613 sids->group.NumAuth = 3;
2614 sids->group.Authority[5] = 5;
2615 sids->group.SubAuthorities[0] = cpu_to_le32(88);
2616 sids->group.SubAuthorities[1] = cpu_to_le32(2);
2617 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2618
2619 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2620 }
2621
2622 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2623 static struct crt_sd_ctxt *
2624 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2625 {
2626 struct crt_sd_ctxt *buf;
2627 __u8 *ptr, *aclptr;
2628 unsigned int acelen, acl_size, ace_count;
2629 unsigned int owner_offset = 0;
2630 unsigned int group_offset = 0;
2631 struct smb3_acl acl = {};
2632
2633 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
2634
2635 if (set_owner) {
2636 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2637 *len += sizeof(struct owner_group_sids);
2638 }
2639
2640 buf = kzalloc(*len, GFP_KERNEL);
2641 if (buf == NULL)
2642 return buf;
2643
2644 ptr = (__u8 *)&buf[1];
2645 if (set_owner) {
2646 /* offset fields are from beginning of security descriptor not of create context */
2647 owner_offset = ptr - (__u8 *)&buf->sd;
2648 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2649 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2650 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2651
2652 setup_owner_group_sids(ptr);
2653 ptr += sizeof(struct owner_group_sids);
2654 } else {
2655 buf->sd.OffsetOwner = 0;
2656 buf->sd.OffsetGroup = 0;
2657 }
2658
2659 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2660 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2661 buf->ccontext.NameLength = cpu_to_le16(4);
2662 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2663 buf->Name[0] = 'S';
2664 buf->Name[1] = 'e';
2665 buf->Name[2] = 'c';
2666 buf->Name[3] = 'D';
2667 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
2668
2669 /*
2670 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2671 * and "DP" ie the DACL is present
2672 */
2673 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2674
2675 /* offset owner, group and Sbz1 and SACL are all zero */
2676 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2677 /* Ship the ACL for now. we will copy it into buf later. */
2678 aclptr = ptr;
2679 ptr += sizeof(struct smb3_acl);
2680
2681 /* create one ACE to hold the mode embedded in reserved special SID */
2682 acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
2683 ptr += acelen;
2684 acl_size = acelen + sizeof(struct smb3_acl);
2685 ace_count = 1;
2686
2687 if (set_owner) {
2688 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2689 acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
2690 ptr += acelen;
2691 acl_size += acelen;
2692 ace_count += 1;
2693 }
2694
2695 /* and one more ACE to allow access for authenticated users */
2696 acelen = setup_authusers_ACE((struct smb_ace *)ptr);
2697 ptr += acelen;
2698 acl_size += acelen;
2699 ace_count += 1;
2700
2701 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2702 acl.AclSize = cpu_to_le16(acl_size);
2703 acl.AceCount = cpu_to_le16(ace_count);
2704 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2705 memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2706
2707 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2708 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2709
2710 return buf;
2711 }
2712
2713 static int
2714 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2715 {
2716 unsigned int num = *num_iovec;
2717 unsigned int len = 0;
2718
2719 iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2720 if (iov[num].iov_base == NULL)
2721 return -ENOMEM;
2722 iov[num].iov_len = len;
2723 *num_iovec = num + 1;
2724 return 0;
2725 }
2726
2727 static struct crt_query_id_ctxt *
2728 create_query_id_buf(void)
2729 {
2730 struct crt_query_id_ctxt *buf;
2731
2732 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2733 if (!buf)
2734 return NULL;
2735
2736 buf->ccontext.DataOffset = cpu_to_le16(0);
2737 buf->ccontext.DataLength = cpu_to_le32(0);
2738 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2739 (struct crt_query_id_ctxt, Name));
2740 buf->ccontext.NameLength = cpu_to_le16(4);
2741 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2742 buf->Name[0] = 'Q';
2743 buf->Name[1] = 'F';
2744 buf->Name[2] = 'i';
2745 buf->Name[3] = 'd';
2746 return buf;
2747 }
2748
2749 /* See MS-SMB2 2.2.13.2.9 */
2750 static int
2751 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2752 {
2753 unsigned int num = *num_iovec;
2754
2755 iov[num].iov_base = create_query_id_buf();
2756 if (iov[num].iov_base == NULL)
2757 return -ENOMEM;
2758 iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2759 *num_iovec = num + 1;
2760 return 0;
2761 }
2762
2763 static void add_ea_context(struct cifs_open_parms *oparms,
2764 struct kvec *rq_iov, unsigned int *num_iovs)
2765 {
2766 struct kvec *iov = oparms->ea_cctx;
2767
2768 if (iov && iov->iov_base && iov->iov_len) {
2769 rq_iov[(*num_iovs)++] = *iov;
2770 memset(iov, 0, sizeof(*iov));
2771 }
2772 }
2773
2774 static int
2775 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2776 const char *treename, const __le16 *path)
2777 {
2778 int treename_len, path_len;
2779 struct nls_table *cp;
2780 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2781
2782 /*
2783 * skip leading "\\"
2784 */
2785 treename_len = strlen(treename);
2786 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2787 return -EINVAL;
2788
2789 treename += 2;
2790 treename_len -= 2;
2791
2792 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2793
2794 /* make room for one path separator only if @path isn't empty */
2795 *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2796
2797 /*
2798 * final path needs to be 8-byte aligned as specified in
2799 * MS-SMB2 2.2.13 SMB2 CREATE Request.
2800 */
2801 *out_size = round_up(*out_len * sizeof(__le16), 8);
2802 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2803 if (!*out_path)
2804 return -ENOMEM;
2805
2806 cp = load_nls_default();
2807 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2808
2809 /* Do not append the separator if the path is empty */
2810 if (path[0] != cpu_to_le16(0x0000)) {
2811 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2812 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2813 }
2814
2815 unload_nls(cp);
2816
2817 return 0;
2818 }
2819
2820 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2821 umode_t mode, struct cifs_tcon *tcon,
2822 const char *full_path,
2823 struct cifs_sb_info *cifs_sb)
2824 {
2825 struct smb_rqst rqst;
2826 struct smb2_create_req *req;
2827 struct smb2_create_rsp *rsp = NULL;
2828 struct cifs_ses *ses = tcon->ses;
2829 struct kvec iov[3]; /* make sure at least one for each open context */
2830 struct kvec rsp_iov = {NULL, 0};
2831 int resp_buftype;
2832 int uni_path_len;
2833 __le16 *copy_path = NULL;
2834 int copy_size;
2835 int rc = 0;
2836 unsigned int n_iov = 2;
2837 __u32 file_attributes = 0;
2838 char *pc_buf = NULL;
2839 int flags = 0;
2840 unsigned int total_len;
2841 __le16 *utf16_path = NULL;
2842 struct TCP_Server_Info *server;
2843 int retries = 0, cur_sleep = 1;
2844
2845 replay_again:
2846 /* reinitialize for possible replay */
2847 flags = 0;
2848 n_iov = 2;
2849 server = cifs_pick_channel(ses);
2850
2851 cifs_dbg(FYI, "mkdir\n");
2852
2853 /* resource #1: path allocation */
2854 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2855 if (!utf16_path)
2856 return -ENOMEM;
2857
2858 if (!ses || !server) {
2859 rc = -EIO;
2860 goto err_free_path;
2861 }
2862
2863 /* resource #2: request */
2864 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2865 (void **) &req, &total_len);
2866 if (rc)
2867 goto err_free_path;
2868
2869
2870 if (smb3_encryption_required(tcon))
2871 flags |= CIFS_TRANSFORM_REQ;
2872
2873 req->ImpersonationLevel = IL_IMPERSONATION;
2874 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2875 /* File attributes ignored on open (used in create though) */
2876 req->FileAttributes = cpu_to_le32(file_attributes);
2877 req->ShareAccess = FILE_SHARE_ALL_LE;
2878 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2879 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2880
2881 iov[0].iov_base = (char *)req;
2882 /* -1 since last byte is buf[0] which is sent below (path) */
2883 iov[0].iov_len = total_len - 1;
2884
2885 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2886
2887 /* [MS-SMB2] 2.2.13 NameOffset:
2888 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2889 * the SMB2 header, the file name includes a prefix that will
2890 * be processed during DFS name normalization as specified in
2891 * section 3.3.5.9. Otherwise, the file name is relative to
2892 * the share that is identified by the TreeId in the SMB2
2893 * header.
2894 */
2895 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2896 int name_len;
2897
2898 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2899 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2900 &name_len,
2901 tcon->tree_name, utf16_path);
2902 if (rc)
2903 goto err_free_req;
2904
2905 req->NameLength = cpu_to_le16(name_len * 2);
2906 uni_path_len = copy_size;
2907 /* free before overwriting resource */
2908 kfree(utf16_path);
2909 utf16_path = copy_path;
2910 } else {
2911 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2912 /* MUST set path len (NameLength) to 0 opening root of share */
2913 req->NameLength = cpu_to_le16(uni_path_len - 2);
2914 if (uni_path_len % 8 != 0) {
2915 copy_size = roundup(uni_path_len, 8);
2916 copy_path = kzalloc(copy_size, GFP_KERNEL);
2917 if (!copy_path) {
2918 rc = -ENOMEM;
2919 goto err_free_req;
2920 }
2921 memcpy((char *)copy_path, (const char *)utf16_path,
2922 uni_path_len);
2923 uni_path_len = copy_size;
2924 /* free before overwriting resource */
2925 kfree(utf16_path);
2926 utf16_path = copy_path;
2927 }
2928 }
2929
2930 iov[1].iov_len = uni_path_len;
2931 iov[1].iov_base = utf16_path;
2932 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2933
2934 if (tcon->posix_extensions) {
2935 /* resource #3: posix buf */
2936 rc = add_posix_context(iov, &n_iov, mode);
2937 if (rc)
2938 goto err_free_req;
2939 req->CreateContextsOffset = cpu_to_le32(
2940 sizeof(struct smb2_create_req) +
2941 iov[1].iov_len);
2942 pc_buf = iov[n_iov-1].iov_base;
2943 }
2944
2945
2946 memset(&rqst, 0, sizeof(struct smb_rqst));
2947 rqst.rq_iov = iov;
2948 rqst.rq_nvec = n_iov;
2949
2950 /* no need to inc num_remote_opens because we close it just below */
2951 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2952 FILE_WRITE_ATTRIBUTES);
2953
2954 if (retries)
2955 smb2_set_replay(server, &rqst);
2956
2957 /* resource #4: response buffer */
2958 rc = cifs_send_recv(xid, ses, server,
2959 &rqst, &resp_buftype, flags, &rsp_iov);
2960 if (rc) {
2961 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2962 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2963 CREATE_NOT_FILE,
2964 FILE_WRITE_ATTRIBUTES, rc);
2965 goto err_free_rsp_buf;
2966 }
2967
2968 /*
2969 * Although unlikely to be possible for rsp to be null and rc not set,
2970 * adding check below is slightly safer long term (and quiets Coverity
2971 * warning)
2972 */
2973 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2974 if (rsp == NULL) {
2975 rc = -EIO;
2976 kfree(pc_buf);
2977 goto err_free_req;
2978 }
2979
2980 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2981 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2982
2983 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2984
2985 /* Eventually save off posix specific response info and timestamps */
2986
2987 err_free_rsp_buf:
2988 free_rsp_buf(resp_buftype, rsp);
2989 kfree(pc_buf);
2990 err_free_req:
2991 cifs_small_buf_release(req);
2992 err_free_path:
2993 kfree(utf16_path);
2994
2995 if (is_replayable_error(rc) &&
2996 smb2_should_replay(tcon, &retries, &cur_sleep))
2997 goto replay_again;
2998
2999 return rc;
3000 }
3001
3002 int
3003 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3004 struct smb_rqst *rqst, __u8 *oplock,
3005 struct cifs_open_parms *oparms, __le16 *path)
3006 {
3007 struct smb2_create_req *req;
3008 unsigned int n_iov = 2;
3009 __u32 file_attributes = 0;
3010 int copy_size;
3011 int uni_path_len;
3012 unsigned int total_len;
3013 struct kvec *iov = rqst->rq_iov;
3014 __le16 *copy_path;
3015 int rc;
3016
3017 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3018 (void **) &req, &total_len);
3019 if (rc)
3020 return rc;
3021
3022 iov[0].iov_base = (char *)req;
3023 /* -1 since last byte is buf[0] which is sent below (path) */
3024 iov[0].iov_len = total_len - 1;
3025
3026 if (oparms->create_options & CREATE_OPTION_READONLY)
3027 file_attributes |= ATTR_READONLY;
3028 if (oparms->create_options & CREATE_OPTION_SPECIAL)
3029 file_attributes |= ATTR_SYSTEM;
3030
3031 req->ImpersonationLevel = IL_IMPERSONATION;
3032 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3033 /* File attributes ignored on open (used in create though) */
3034 req->FileAttributes = cpu_to_le32(file_attributes);
3035 req->ShareAccess = FILE_SHARE_ALL_LE;
3036
3037 req->CreateDisposition = cpu_to_le32(oparms->disposition);
3038 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3039 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3040
3041 /* [MS-SMB2] 2.2.13 NameOffset:
3042 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3043 * the SMB2 header, the file name includes a prefix that will
3044 * be processed during DFS name normalization as specified in
3045 * section 3.3.5.9. Otherwise, the file name is relative to
3046 * the share that is identified by the TreeId in the SMB2
3047 * header.
3048 */
3049 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3050 int name_len;
3051
3052 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3053 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3054 &name_len,
3055 tcon->tree_name, path);
3056 if (rc)
3057 return rc;
3058 req->NameLength = cpu_to_le16(name_len * 2);
3059 uni_path_len = copy_size;
3060 path = copy_path;
3061 } else {
3062 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3063 /* MUST set path len (NameLength) to 0 opening root of share */
3064 req->NameLength = cpu_to_le16(uni_path_len - 2);
3065 copy_size = round_up(uni_path_len, 8);
3066 copy_path = kzalloc(copy_size, GFP_KERNEL);
3067 if (!copy_path)
3068 return -ENOMEM;
3069 memcpy((char *)copy_path, (const char *)path,
3070 uni_path_len);
3071 uni_path_len = copy_size;
3072 path = copy_path;
3073 }
3074
3075 iov[1].iov_len = uni_path_len;
3076 iov[1].iov_base = path;
3077
3078 if ((!server->oplocks) || (tcon->no_lease))
3079 *oplock = SMB2_OPLOCK_LEVEL_NONE;
3080
3081 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3082 *oplock == SMB2_OPLOCK_LEVEL_NONE)
3083 req->RequestedOplockLevel = *oplock;
3084 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3085 (oparms->create_options & CREATE_NOT_FILE))
3086 req->RequestedOplockLevel = *oplock; /* no srv lease support */
3087 else {
3088 rc = add_lease_context(server, req, iov, &n_iov,
3089 oparms->fid->lease_key, oplock);
3090 if (rc)
3091 return rc;
3092 }
3093
3094 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3095 rc = add_durable_context(iov, &n_iov, oparms,
3096 tcon->use_persistent);
3097 if (rc)
3098 return rc;
3099 }
3100
3101 if (tcon->posix_extensions) {
3102 rc = add_posix_context(iov, &n_iov, oparms->mode);
3103 if (rc)
3104 return rc;
3105 }
3106
3107 if (tcon->snapshot_time) {
3108 cifs_dbg(FYI, "adding snapshot context\n");
3109 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3110 if (rc)
3111 return rc;
3112 }
3113
3114 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3115 bool set_mode;
3116 bool set_owner;
3117
3118 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3119 (oparms->mode != ACL_NO_MODE))
3120 set_mode = true;
3121 else {
3122 set_mode = false;
3123 oparms->mode = ACL_NO_MODE;
3124 }
3125
3126 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3127 set_owner = true;
3128 else
3129 set_owner = false;
3130
3131 if (set_owner | set_mode) {
3132 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3133 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3134 if (rc)
3135 return rc;
3136 }
3137 }
3138
3139 add_query_id_context(iov, &n_iov);
3140 add_ea_context(oparms, iov, &n_iov);
3141
3142 if (n_iov > 2) {
3143 /*
3144 * We have create contexts behind iov[1] (the file
3145 * name), point at them from the main create request
3146 */
3147 req->CreateContextsOffset = cpu_to_le32(
3148 sizeof(struct smb2_create_req) +
3149 iov[1].iov_len);
3150 req->CreateContextsLength = 0;
3151
3152 for (unsigned int i = 2; i < (n_iov-1); i++) {
3153 struct kvec *v = &iov[i];
3154 size_t len = v->iov_len;
3155 struct create_context *cctx =
3156 (struct create_context *)v->iov_base;
3157
3158 cctx->Next = cpu_to_le32(len);
3159 le32_add_cpu(&req->CreateContextsLength, len);
3160 }
3161 le32_add_cpu(&req->CreateContextsLength,
3162 iov[n_iov-1].iov_len);
3163 }
3164
3165 rqst->rq_nvec = n_iov;
3166 return 0;
3167 }
3168
3169 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3170 * All other vectors are freed by kfree().
3171 */
3172 void
3173 SMB2_open_free(struct smb_rqst *rqst)
3174 {
3175 int i;
3176
3177 if (rqst && rqst->rq_iov) {
3178 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3179 for (i = 1; i < rqst->rq_nvec; i++)
3180 if (rqst->rq_iov[i].iov_base != smb2_padding)
3181 kfree(rqst->rq_iov[i].iov_base);
3182 }
3183 }
3184
3185 int
3186 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3187 __u8 *oplock, struct smb2_file_all_info *buf,
3188 struct create_posix_rsp *posix,
3189 struct kvec *err_iov, int *buftype)
3190 {
3191 struct smb_rqst rqst;
3192 struct smb2_create_rsp *rsp = NULL;
3193 struct cifs_tcon *tcon = oparms->tcon;
3194 struct cifs_ses *ses = tcon->ses;
3195 struct TCP_Server_Info *server;
3196 struct kvec iov[SMB2_CREATE_IOV_SIZE];
3197 struct kvec rsp_iov = {NULL, 0};
3198 int resp_buftype = CIFS_NO_BUFFER;
3199 int rc = 0;
3200 int flags = 0;
3201 int retries = 0, cur_sleep = 1;
3202
3203 replay_again:
3204 /* reinitialize for possible replay */
3205 flags = 0;
3206 server = cifs_pick_channel(ses);
3207 oparms->replay = !!(retries);
3208
3209 cifs_dbg(FYI, "create/open\n");
3210 if (!ses || !server)
3211 return -EIO;
3212
3213 if (smb3_encryption_required(tcon))
3214 flags |= CIFS_TRANSFORM_REQ;
3215
3216 memset(&rqst, 0, sizeof(struct smb_rqst));
3217 memset(&iov, 0, sizeof(iov));
3218 rqst.rq_iov = iov;
3219 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3220
3221 rc = SMB2_open_init(tcon, server,
3222 &rqst, oplock, oparms, path);
3223 if (rc)
3224 goto creat_exit;
3225
3226 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3227 oparms->create_options, oparms->desired_access);
3228
3229 if (retries)
3230 smb2_set_replay(server, &rqst);
3231
3232 rc = cifs_send_recv(xid, ses, server,
3233 &rqst, &resp_buftype, flags,
3234 &rsp_iov);
3235 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3236
3237 if (rc != 0) {
3238 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3239 if (err_iov && rsp) {
3240 *err_iov = rsp_iov;
3241 *buftype = resp_buftype;
3242 resp_buftype = CIFS_NO_BUFFER;
3243 rsp = NULL;
3244 }
3245 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3246 oparms->create_options, oparms->desired_access, rc);
3247 if (rc == -EREMCHG) {
3248 pr_warn_once("server share %s deleted\n",
3249 tcon->tree_name);
3250 tcon->need_reconnect = true;
3251 }
3252 goto creat_exit;
3253 } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3254 goto creat_exit;
3255 else
3256 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3257 oparms->create_options, oparms->desired_access);
3258
3259 atomic_inc(&tcon->num_remote_opens);
3260 oparms->fid->persistent_fid = rsp->PersistentFileId;
3261 oparms->fid->volatile_fid = rsp->VolatileFileId;
3262 oparms->fid->access = oparms->desired_access;
3263 #ifdef CONFIG_CIFS_DEBUG2
3264 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3265 #endif /* CIFS_DEBUG2 */
3266
3267 if (buf) {
3268 buf->CreationTime = rsp->CreationTime;
3269 buf->LastAccessTime = rsp->LastAccessTime;
3270 buf->LastWriteTime = rsp->LastWriteTime;
3271 buf->ChangeTime = rsp->ChangeTime;
3272 buf->AllocationSize = rsp->AllocationSize;
3273 buf->EndOfFile = rsp->EndofFile;
3274 buf->Attributes = rsp->FileAttributes;
3275 buf->NumberOfLinks = cpu_to_le32(1);
3276 buf->DeletePending = 0;
3277 }
3278
3279
3280 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3281 oparms->fid->lease_key, oplock, buf, posix);
3282 creat_exit:
3283 SMB2_open_free(&rqst);
3284 free_rsp_buf(resp_buftype, rsp);
3285
3286 if (is_replayable_error(rc) &&
3287 smb2_should_replay(tcon, &retries, &cur_sleep))
3288 goto replay_again;
3289
3290 return rc;
3291 }
3292
3293 int
3294 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3295 struct smb_rqst *rqst,
3296 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3297 char *in_data, u32 indatalen,
3298 __u32 max_response_size)
3299 {
3300 struct smb2_ioctl_req *req;
3301 struct kvec *iov = rqst->rq_iov;
3302 unsigned int total_len;
3303 int rc;
3304 char *in_data_buf;
3305
3306 rc = smb2_ioctl_req_init(opcode, tcon, server,
3307 (void **) &req, &total_len);
3308 if (rc)
3309 return rc;
3310
3311 if (indatalen) {
3312 /*
3313 * indatalen is usually small at a couple of bytes max, so
3314 * just allocate through generic pool
3315 */
3316 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3317 if (!in_data_buf) {
3318 cifs_small_buf_release(req);
3319 return -ENOMEM;
3320 }
3321 }
3322
3323 req->CtlCode = cpu_to_le32(opcode);
3324 req->PersistentFileId = persistent_fid;
3325 req->VolatileFileId = volatile_fid;
3326
3327 iov[0].iov_base = (char *)req;
3328 /*
3329 * If no input data, the size of ioctl struct in
3330 * protocol spec still includes a 1 byte data buffer,
3331 * but if input data passed to ioctl, we do not
3332 * want to double count this, so we do not send
3333 * the dummy one byte of data in iovec[0] if sending
3334 * input data (in iovec[1]).
3335 */
3336 if (indatalen) {
3337 req->InputCount = cpu_to_le32(indatalen);
3338 /* do not set InputOffset if no input data */
3339 req->InputOffset =
3340 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3341 rqst->rq_nvec = 2;
3342 iov[0].iov_len = total_len - 1;
3343 iov[1].iov_base = in_data_buf;
3344 iov[1].iov_len = indatalen;
3345 } else {
3346 rqst->rq_nvec = 1;
3347 iov[0].iov_len = total_len;
3348 }
3349
3350 req->OutputOffset = 0;
3351 req->OutputCount = 0; /* MBZ */
3352
3353 /*
3354 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3355 * We Could increase default MaxOutputResponse, but that could require
3356 * more credits. Windows typically sets this smaller, but for some
3357 * ioctls it may be useful to allow server to send more. No point
3358 * limiting what the server can send as long as fits in one credit
3359 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3360 * to increase this limit up in the future.
3361 * Note that for snapshot queries that servers like Azure expect that
3362 * the first query be minimal size (and just used to get the number/size
3363 * of previous versions) so response size must be specified as EXACTLY
3364 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3365 * of eight bytes. Currently that is the only case where we set max
3366 * response size smaller.
3367 */
3368 req->MaxOutputResponse = cpu_to_le32(max_response_size);
3369 req->hdr.CreditCharge =
3370 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3371 SMB2_MAX_BUFFER_SIZE));
3372 /* always an FSCTL (for now) */
3373 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3374
3375 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3376 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3377 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3378
3379 return 0;
3380 }
3381
3382 void
3383 SMB2_ioctl_free(struct smb_rqst *rqst)
3384 {
3385 int i;
3386
3387 if (rqst && rqst->rq_iov) {
3388 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3389 for (i = 1; i < rqst->rq_nvec; i++)
3390 if (rqst->rq_iov[i].iov_base != smb2_padding)
3391 kfree(rqst->rq_iov[i].iov_base);
3392 }
3393 }
3394
3395
3396 /*
3397 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
3398 */
3399 int
3400 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3401 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3402 u32 max_out_data_len, char **out_data,
3403 u32 *plen /* returned data len */)
3404 {
3405 struct smb_rqst rqst;
3406 struct smb2_ioctl_rsp *rsp = NULL;
3407 struct cifs_ses *ses;
3408 struct TCP_Server_Info *server;
3409 struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3410 struct kvec rsp_iov = {NULL, 0};
3411 int resp_buftype = CIFS_NO_BUFFER;
3412 int rc = 0;
3413 int flags = 0;
3414 int retries = 0, cur_sleep = 1;
3415
3416 if (!tcon)
3417 return -EIO;
3418
3419 ses = tcon->ses;
3420 if (!ses)
3421 return -EIO;
3422
3423 replay_again:
3424 /* reinitialize for possible replay */
3425 flags = 0;
3426 server = cifs_pick_channel(ses);
3427
3428 if (!server)
3429 return -EIO;
3430
3431 cifs_dbg(FYI, "SMB2 IOCTL\n");
3432
3433 if (out_data != NULL)
3434 *out_data = NULL;
3435
3436 /* zero out returned data len, in case of error */
3437 if (plen)
3438 *plen = 0;
3439
3440 if (smb3_encryption_required(tcon))
3441 flags |= CIFS_TRANSFORM_REQ;
3442
3443 memset(&rqst, 0, sizeof(struct smb_rqst));
3444 memset(&iov, 0, sizeof(iov));
3445 rqst.rq_iov = iov;
3446 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3447
3448 rc = SMB2_ioctl_init(tcon, server,
3449 &rqst, persistent_fid, volatile_fid, opcode,
3450 in_data, indatalen, max_out_data_len);
3451 if (rc)
3452 goto ioctl_exit;
3453
3454 if (retries)
3455 smb2_set_replay(server, &rqst);
3456
3457 rc = cifs_send_recv(xid, ses, server,
3458 &rqst, &resp_buftype, flags,
3459 &rsp_iov);
3460 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3461
3462 if (rc != 0)
3463 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3464 ses->Suid, 0, opcode, rc);
3465
3466 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3467 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3468 goto ioctl_exit;
3469 } else if (rc == -EINVAL) {
3470 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3471 (opcode != FSCTL_SRV_COPYCHUNK)) {
3472 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3473 goto ioctl_exit;
3474 }
3475 } else if (rc == -E2BIG) {
3476 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3477 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3478 goto ioctl_exit;
3479 }
3480 }
3481
3482 /* check if caller wants to look at return data or just return rc */
3483 if ((plen == NULL) || (out_data == NULL))
3484 goto ioctl_exit;
3485
3486 /*
3487 * Although unlikely to be possible for rsp to be null and rc not set,
3488 * adding check below is slightly safer long term (and quiets Coverity
3489 * warning)
3490 */
3491 if (rsp == NULL) {
3492 rc = -EIO;
3493 goto ioctl_exit;
3494 }
3495
3496 *plen = le32_to_cpu(rsp->OutputCount);
3497
3498 /* We check for obvious errors in the output buffer length and offset */
3499 if (*plen == 0)
3500 goto ioctl_exit; /* server returned no data */
3501 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3502 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3503 *plen = 0;
3504 rc = -EIO;
3505 goto ioctl_exit;
3506 }
3507
3508 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3509 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3510 le32_to_cpu(rsp->OutputOffset));
3511 *plen = 0;
3512 rc = -EIO;
3513 goto ioctl_exit;
3514 }
3515
3516 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3517 *plen, GFP_KERNEL);
3518 if (*out_data == NULL) {
3519 rc = -ENOMEM;
3520 goto ioctl_exit;
3521 }
3522
3523 ioctl_exit:
3524 SMB2_ioctl_free(&rqst);
3525 free_rsp_buf(resp_buftype, rsp);
3526
3527 if (is_replayable_error(rc) &&
3528 smb2_should_replay(tcon, &retries, &cur_sleep))
3529 goto replay_again;
3530
3531 return rc;
3532 }
3533
3534 /*
3535 * Individual callers to ioctl worker function follow
3536 */
3537
3538 int
3539 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3540 u64 persistent_fid, u64 volatile_fid)
3541 {
3542 int rc;
3543 struct compress_ioctl fsctl_input;
3544 char *ret_data = NULL;
3545
3546 fsctl_input.CompressionState =
3547 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3548
3549 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3550 FSCTL_SET_COMPRESSION,
3551 (char *)&fsctl_input /* data input */,
3552 2 /* in data len */, CIFSMaxBufSize /* max out data */,
3553 &ret_data /* out data */, NULL);
3554
3555 cifs_dbg(FYI, "set compression rc %d\n", rc);
3556
3557 return rc;
3558 }
3559
3560 int
3561 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3562 struct smb_rqst *rqst,
3563 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3564 {
3565 struct smb2_close_req *req;
3566 struct kvec *iov = rqst->rq_iov;
3567 unsigned int total_len;
3568 int rc;
3569
3570 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3571 (void **) &req, &total_len);
3572 if (rc)
3573 return rc;
3574
3575 req->PersistentFileId = persistent_fid;
3576 req->VolatileFileId = volatile_fid;
3577 if (query_attrs)
3578 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3579 else
3580 req->Flags = 0;
3581 iov[0].iov_base = (char *)req;
3582 iov[0].iov_len = total_len;
3583
3584 return 0;
3585 }
3586
3587 void
3588 SMB2_close_free(struct smb_rqst *rqst)
3589 {
3590 if (rqst && rqst->rq_iov)
3591 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3592 }
3593
3594 int
3595 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3596 u64 persistent_fid, u64 volatile_fid,
3597 struct smb2_file_network_open_info *pbuf)
3598 {
3599 struct smb_rqst rqst;
3600 struct smb2_close_rsp *rsp = NULL;
3601 struct cifs_ses *ses = tcon->ses;
3602 struct TCP_Server_Info *server;
3603 struct kvec iov[1];
3604 struct kvec rsp_iov;
3605 int resp_buftype = CIFS_NO_BUFFER;
3606 int rc = 0;
3607 int flags = 0;
3608 bool query_attrs = false;
3609 int retries = 0, cur_sleep = 1;
3610
3611 replay_again:
3612 /* reinitialize for possible replay */
3613 flags = 0;
3614 query_attrs = false;
3615 server = cifs_pick_channel(ses);
3616
3617 cifs_dbg(FYI, "Close\n");
3618
3619 if (!ses || !server)
3620 return -EIO;
3621
3622 if (smb3_encryption_required(tcon))
3623 flags |= CIFS_TRANSFORM_REQ;
3624
3625 memset(&rqst, 0, sizeof(struct smb_rqst));
3626 memset(&iov, 0, sizeof(iov));
3627 rqst.rq_iov = iov;
3628 rqst.rq_nvec = 1;
3629
3630 /* check if need to ask server to return timestamps in close response */
3631 if (pbuf)
3632 query_attrs = true;
3633
3634 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3635 rc = SMB2_close_init(tcon, server,
3636 &rqst, persistent_fid, volatile_fid,
3637 query_attrs);
3638 if (rc)
3639 goto close_exit;
3640
3641 if (retries)
3642 smb2_set_replay(server, &rqst);
3643
3644 rc = cifs_send_recv(xid, ses, server,
3645 &rqst, &resp_buftype, flags, &rsp_iov);
3646 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3647
3648 if (rc != 0) {
3649 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3650 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3651 rc);
3652 goto close_exit;
3653 } else {
3654 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3655 ses->Suid);
3656 if (pbuf)
3657 memcpy(&pbuf->network_open_info,
3658 &rsp->network_open_info,
3659 sizeof(pbuf->network_open_info));
3660 atomic_dec(&tcon->num_remote_opens);
3661 }
3662
3663 close_exit:
3664 SMB2_close_free(&rqst);
3665 free_rsp_buf(resp_buftype, rsp);
3666
3667 /* retry close in a worker thread if this one is interrupted */
3668 if (is_interrupt_error(rc)) {
3669 int tmp_rc;
3670
3671 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3672 volatile_fid);
3673 if (tmp_rc)
3674 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3675 persistent_fid, tmp_rc);
3676 }
3677
3678 if (is_replayable_error(rc) &&
3679 smb2_should_replay(tcon, &retries, &cur_sleep))
3680 goto replay_again;
3681
3682 return rc;
3683 }
3684
3685 int
3686 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3687 u64 persistent_fid, u64 volatile_fid)
3688 {
3689 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3690 }
3691
3692 int
3693 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3694 struct kvec *iov, unsigned int min_buf_size)
3695 {
3696 unsigned int smb_len = iov->iov_len;
3697 char *end_of_smb = smb_len + (char *)iov->iov_base;
3698 char *begin_of_buf = offset + (char *)iov->iov_base;
3699 char *end_of_buf = begin_of_buf + buffer_length;
3700
3701
3702 if (buffer_length < min_buf_size) {
3703 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3704 buffer_length, min_buf_size);
3705 return -EINVAL;
3706 }
3707
3708 /* check if beyond RFC1001 maximum length */
3709 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3710 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3711 buffer_length, smb_len);
3712 return -EINVAL;
3713 }
3714
3715 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3716 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3717 return -EINVAL;
3718 }
3719
3720 return 0;
3721 }
3722
3723 /*
3724 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3725 * Caller must free buffer.
3726 */
3727 int
3728 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3729 struct kvec *iov, unsigned int minbufsize,
3730 char *data)
3731 {
3732 char *begin_of_buf = offset + (char *)iov->iov_base;
3733 int rc;
3734
3735 if (!data)
3736 return -EINVAL;
3737
3738 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3739 if (rc)
3740 return rc;
3741
3742 memcpy(data, begin_of_buf, minbufsize);
3743
3744 return 0;
3745 }
3746
3747 int
3748 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3749 struct smb_rqst *rqst,
3750 u64 persistent_fid, u64 volatile_fid,
3751 u8 info_class, u8 info_type, u32 additional_info,
3752 size_t output_len, size_t input_len, void *input)
3753 {
3754 struct smb2_query_info_req *req;
3755 struct kvec *iov = rqst->rq_iov;
3756 unsigned int total_len;
3757 size_t len;
3758 int rc;
3759
3760 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3761 len > CIFSMaxBufSize))
3762 return -EINVAL;
3763
3764 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3765 (void **) &req, &total_len);
3766 if (rc)
3767 return rc;
3768
3769 req->InfoType = info_type;
3770 req->FileInfoClass = info_class;
3771 req->PersistentFileId = persistent_fid;
3772 req->VolatileFileId = volatile_fid;
3773 req->AdditionalInformation = cpu_to_le32(additional_info);
3774
3775 req->OutputBufferLength = cpu_to_le32(output_len);
3776 if (input_len) {
3777 req->InputBufferLength = cpu_to_le32(input_len);
3778 /* total_len for smb query request never close to le16 max */
3779 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3780 memcpy(req->Buffer, input, input_len);
3781 }
3782
3783 iov[0].iov_base = (char *)req;
3784 /* 1 for Buffer */
3785 iov[0].iov_len = len;
3786 return 0;
3787 }
3788
3789 void
3790 SMB2_query_info_free(struct smb_rqst *rqst)
3791 {
3792 if (rqst && rqst->rq_iov)
3793 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3794 }
3795
3796 static int
3797 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3798 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3799 u32 additional_info, size_t output_len, size_t min_len, void **data,
3800 u32 *dlen)
3801 {
3802 struct smb_rqst rqst;
3803 struct smb2_query_info_rsp *rsp = NULL;
3804 struct kvec iov[1];
3805 struct kvec rsp_iov;
3806 int rc = 0;
3807 int resp_buftype = CIFS_NO_BUFFER;
3808 struct cifs_ses *ses = tcon->ses;
3809 struct TCP_Server_Info *server;
3810 int flags = 0;
3811 bool allocated = false;
3812 int retries = 0, cur_sleep = 1;
3813
3814 cifs_dbg(FYI, "Query Info\n");
3815
3816 if (!ses)
3817 return -EIO;
3818
3819 replay_again:
3820 /* reinitialize for possible replay */
3821 flags = 0;
3822 allocated = false;
3823 server = cifs_pick_channel(ses);
3824
3825 if (!server)
3826 return -EIO;
3827
3828 if (smb3_encryption_required(tcon))
3829 flags |= CIFS_TRANSFORM_REQ;
3830
3831 memset(&rqst, 0, sizeof(struct smb_rqst));
3832 memset(&iov, 0, sizeof(iov));
3833 rqst.rq_iov = iov;
3834 rqst.rq_nvec = 1;
3835
3836 rc = SMB2_query_info_init(tcon, server,
3837 &rqst, persistent_fid, volatile_fid,
3838 info_class, info_type, additional_info,
3839 output_len, 0, NULL);
3840 if (rc)
3841 goto qinf_exit;
3842
3843 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3844 ses->Suid, info_class, (__u32)info_type);
3845
3846 if (retries)
3847 smb2_set_replay(server, &rqst);
3848
3849 rc = cifs_send_recv(xid, ses, server,
3850 &rqst, &resp_buftype, flags, &rsp_iov);
3851 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3852
3853 if (rc) {
3854 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3855 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3856 ses->Suid, info_class, (__u32)info_type, rc);
3857 goto qinf_exit;
3858 }
3859
3860 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3861 ses->Suid, info_class, (__u32)info_type);
3862
3863 if (dlen) {
3864 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3865 if (!*data) {
3866 *data = kmalloc(*dlen, GFP_KERNEL);
3867 if (!*data) {
3868 cifs_tcon_dbg(VFS,
3869 "Error %d allocating memory for acl\n",
3870 rc);
3871 *dlen = 0;
3872 rc = -ENOMEM;
3873 goto qinf_exit;
3874 }
3875 allocated = true;
3876 }
3877 }
3878
3879 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3880 le32_to_cpu(rsp->OutputBufferLength),
3881 &rsp_iov, dlen ? *dlen : min_len, *data);
3882 if (rc && allocated) {
3883 kfree(*data);
3884 *data = NULL;
3885 *dlen = 0;
3886 }
3887
3888 qinf_exit:
3889 SMB2_query_info_free(&rqst);
3890 free_rsp_buf(resp_buftype, rsp);
3891
3892 if (is_replayable_error(rc) &&
3893 smb2_should_replay(tcon, &retries, &cur_sleep))
3894 goto replay_again;
3895
3896 return rc;
3897 }
3898
3899 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3900 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3901 {
3902 return query_info(xid, tcon, persistent_fid, volatile_fid,
3903 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3904 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3905 sizeof(struct smb2_file_all_info), (void **)&data,
3906 NULL);
3907 }
3908
3909 #if 0
3910 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3911 int
3912 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3913 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3914 {
3915 size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3916 (sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);
3917 *plen = 0;
3918
3919 return query_info(xid, tcon, persistent_fid, volatile_fid,
3920 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3921 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3922 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3923 }
3924 #endif
3925
3926 int
3927 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3928 u64 persistent_fid, u64 volatile_fid,
3929 void **data, u32 *plen, u32 extra_info)
3930 {
3931 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3932 extra_info;
3933 *plen = 0;
3934
3935 return query_info(xid, tcon, persistent_fid, volatile_fid,
3936 0, SMB2_O_INFO_SECURITY, additional_info,
3937 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3938 }
3939
3940 int
3941 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3942 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3943 {
3944 return query_info(xid, tcon, persistent_fid, volatile_fid,
3945 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3946 sizeof(struct smb2_file_internal_info),
3947 sizeof(struct smb2_file_internal_info),
3948 (void **)&uniqueid, NULL);
3949 }
3950
3951 /*
3952 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3953 * See MS-SMB2 2.2.35 and 2.2.36
3954 */
3955
3956 static int
3957 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3958 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3959 u64 persistent_fid, u64 volatile_fid,
3960 u32 completion_filter, bool watch_tree)
3961 {
3962 struct smb2_change_notify_req *req;
3963 struct kvec *iov = rqst->rq_iov;
3964 unsigned int total_len;
3965 int rc;
3966
3967 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3968 (void **) &req, &total_len);
3969 if (rc)
3970 return rc;
3971
3972 req->PersistentFileId = persistent_fid;
3973 req->VolatileFileId = volatile_fid;
3974 /* See note 354 of MS-SMB2, 64K max */
3975 req->OutputBufferLength =
3976 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3977 req->CompletionFilter = cpu_to_le32(completion_filter);
3978 if (watch_tree)
3979 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3980 else
3981 req->Flags = 0;
3982
3983 iov[0].iov_base = (char *)req;
3984 iov[0].iov_len = total_len;
3985
3986 return 0;
3987 }
3988
3989 int
3990 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3991 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3992 u32 completion_filter, u32 max_out_data_len, char **out_data,
3993 u32 *plen /* returned data len */)
3994 {
3995 struct cifs_ses *ses = tcon->ses;
3996 struct TCP_Server_Info *server;
3997 struct smb_rqst rqst;
3998 struct smb2_change_notify_rsp *smb_rsp;
3999 struct kvec iov[1];
4000 struct kvec rsp_iov = {NULL, 0};
4001 int resp_buftype = CIFS_NO_BUFFER;
4002 int flags = 0;
4003 int rc = 0;
4004 int retries = 0, cur_sleep = 1;
4005
4006 replay_again:
4007 /* reinitialize for possible replay */
4008 flags = 0;
4009 server = cifs_pick_channel(ses);
4010
4011 cifs_dbg(FYI, "change notify\n");
4012 if (!ses || !server)
4013 return -EIO;
4014
4015 if (smb3_encryption_required(tcon))
4016 flags |= CIFS_TRANSFORM_REQ;
4017
4018 memset(&rqst, 0, sizeof(struct smb_rqst));
4019 memset(&iov, 0, sizeof(iov));
4020 if (plen)
4021 *plen = 0;
4022
4023 rqst.rq_iov = iov;
4024 rqst.rq_nvec = 1;
4025
4026 rc = SMB2_notify_init(xid, &rqst, tcon, server,
4027 persistent_fid, volatile_fid,
4028 completion_filter, watch_tree);
4029 if (rc)
4030 goto cnotify_exit;
4031
4032 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4033 (u8)watch_tree, completion_filter);
4034
4035 if (retries)
4036 smb2_set_replay(server, &rqst);
4037
4038 rc = cifs_send_recv(xid, ses, server,
4039 &rqst, &resp_buftype, flags, &rsp_iov);
4040
4041 if (rc != 0) {
4042 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4043 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4044 (u8)watch_tree, completion_filter, rc);
4045 } else {
4046 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4047 ses->Suid, (u8)watch_tree, completion_filter);
4048 /* validate that notify information is plausible */
4049 if ((rsp_iov.iov_base == NULL) ||
4050 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4051 goto cnotify_exit;
4052
4053 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4054
4055 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4056 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4057 sizeof(struct file_notify_information));
4058
4059 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4060 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4061 if (*out_data == NULL) {
4062 rc = -ENOMEM;
4063 goto cnotify_exit;
4064 } else if (plen)
4065 *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4066 }
4067
4068 cnotify_exit:
4069 if (rqst.rq_iov)
4070 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4071 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4072
4073 if (is_replayable_error(rc) &&
4074 smb2_should_replay(tcon, &retries, &cur_sleep))
4075 goto replay_again;
4076
4077 return rc;
4078 }
4079
4080
4081
4082 /*
4083 * This is a no-op for now. We're not really interested in the reply, but
4084 * rather in the fact that the server sent one and that server->lstrp
4085 * gets updated.
4086 *
4087 * FIXME: maybe we should consider checking that the reply matches request?
4088 */
4089 static void
4090 smb2_echo_callback(struct mid_q_entry *mid)
4091 {
4092 struct TCP_Server_Info *server = mid->callback_data;
4093 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4094 struct cifs_credits credits = { .value = 0, .instance = 0 };
4095
4096 if (mid->mid_state == MID_RESPONSE_RECEIVED
4097 || mid->mid_state == MID_RESPONSE_MALFORMED) {
4098 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4099 credits.instance = server->reconnect_instance;
4100 }
4101
4102 release_mid(mid);
4103 add_credits(server, &credits, CIFS_ECHO_OP);
4104 }
4105
4106 void smb2_reconnect_server(struct work_struct *work)
4107 {
4108 struct TCP_Server_Info *server = container_of(work,
4109 struct TCP_Server_Info, reconnect.work);
4110 struct TCP_Server_Info *pserver;
4111 struct cifs_ses *ses, *ses2;
4112 struct cifs_tcon *tcon, *tcon2;
4113 struct list_head tmp_list, tmp_ses_list;
4114 bool ses_exist = false;
4115 bool tcon_selected = false;
4116 int rc;
4117 bool resched = false;
4118
4119 /* first check if ref count has reached 0, if not inc ref count */
4120 spin_lock(&cifs_tcp_ses_lock);
4121 if (!server->srv_count) {
4122 spin_unlock(&cifs_tcp_ses_lock);
4123 return;
4124 }
4125 server->srv_count++;
4126 spin_unlock(&cifs_tcp_ses_lock);
4127
4128 /* If server is a channel, select the primary channel */
4129 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4130
4131 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4132 mutex_lock(&pserver->reconnect_mutex);
4133
4134 /* if the server is marked for termination, drop the ref count here */
4135 if (server->terminate) {
4136 cifs_put_tcp_session(server, true);
4137 mutex_unlock(&pserver->reconnect_mutex);
4138 return;
4139 }
4140
4141 INIT_LIST_HEAD(&tmp_list);
4142 INIT_LIST_HEAD(&tmp_ses_list);
4143 cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4144
4145 spin_lock(&cifs_tcp_ses_lock);
4146 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4147 spin_lock(&ses->ses_lock);
4148 if (ses->ses_status == SES_EXITING) {
4149 spin_unlock(&ses->ses_lock);
4150 continue;
4151 }
4152 spin_unlock(&ses->ses_lock);
4153
4154 tcon_selected = false;
4155
4156 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4157 if (tcon->need_reconnect || tcon->need_reopen_files) {
4158 tcon->tc_count++;
4159 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4160 netfs_trace_tcon_ref_get_reconnect_server);
4161 list_add_tail(&tcon->rlist, &tmp_list);
4162 tcon_selected = true;
4163 }
4164 }
4165 /*
4166 * IPC has the same lifetime as its session and uses its
4167 * refcount.
4168 */
4169 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4170 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4171 tcon_selected = true;
4172 cifs_smb_ses_inc_refcount(ses);
4173 }
4174 /*
4175 * handle the case where channel needs to reconnect
4176 * binding session, but tcon is healthy (some other channel
4177 * is active)
4178 */
4179 spin_lock(&ses->chan_lock);
4180 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4181 list_add_tail(&ses->rlist, &tmp_ses_list);
4182 ses_exist = true;
4183 cifs_smb_ses_inc_refcount(ses);
4184 }
4185 spin_unlock(&ses->chan_lock);
4186 }
4187 spin_unlock(&cifs_tcp_ses_lock);
4188
4189 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4190 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4191 if (!rc)
4192 cifs_reopen_persistent_handles(tcon);
4193 else
4194 resched = true;
4195 list_del_init(&tcon->rlist);
4196 if (tcon->ipc)
4197 cifs_put_smb_ses(tcon->ses);
4198 else
4199 cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4200 }
4201
4202 if (!ses_exist)
4203 goto done;
4204
4205 /* allocate a dummy tcon struct used for reconnect */
4206 tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4207 if (!tcon) {
4208 resched = true;
4209 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4210 list_del_init(&ses->rlist);
4211 cifs_put_smb_ses(ses);
4212 }
4213 goto done;
4214 }
4215
4216 tcon->status = TID_GOOD;
4217 tcon->retry = false;
4218 tcon->need_reconnect = false;
4219
4220 /* now reconnect sessions for necessary channels */
4221 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4222 tcon->ses = ses;
4223 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4224 if (rc)
4225 resched = true;
4226 list_del_init(&ses->rlist);
4227 cifs_put_smb_ses(ses);
4228 }
4229 tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4230
4231 done:
4232 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4233 if (resched)
4234 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4235 mutex_unlock(&pserver->reconnect_mutex);
4236
4237 /* now we can safely release srv struct */
4238 cifs_put_tcp_session(server, true);
4239 }
4240
4241 int
4242 SMB2_echo(struct TCP_Server_Info *server)
4243 {
4244 struct smb2_echo_req *req;
4245 int rc = 0;
4246 struct kvec iov[1];
4247 struct smb_rqst rqst = { .rq_iov = iov,
4248 .rq_nvec = 1 };
4249 unsigned int total_len;
4250
4251 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4252
4253 spin_lock(&server->srv_lock);
4254 if (server->ops->need_neg &&
4255 server->ops->need_neg(server)) {
4256 spin_unlock(&server->srv_lock);
4257 /* No need to send echo on newly established connections */
4258 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4259 return rc;
4260 }
4261 spin_unlock(&server->srv_lock);
4262
4263 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4264 (void **)&req, &total_len);
4265 if (rc)
4266 return rc;
4267
4268 req->hdr.CreditRequest = cpu_to_le16(1);
4269
4270 iov[0].iov_len = total_len;
4271 iov[0].iov_base = (char *)req;
4272
4273 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4274 server, CIFS_ECHO_OP, NULL);
4275 if (rc)
4276 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4277
4278 cifs_small_buf_release(req);
4279 return rc;
4280 }
4281
4282 void
4283 SMB2_flush_free(struct smb_rqst *rqst)
4284 {
4285 if (rqst && rqst->rq_iov)
4286 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4287 }
4288
4289 int
4290 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4291 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4292 u64 persistent_fid, u64 volatile_fid)
4293 {
4294 struct smb2_flush_req *req;
4295 struct kvec *iov = rqst->rq_iov;
4296 unsigned int total_len;
4297 int rc;
4298
4299 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4300 (void **) &req, &total_len);
4301 if (rc)
4302 return rc;
4303
4304 req->PersistentFileId = persistent_fid;
4305 req->VolatileFileId = volatile_fid;
4306
4307 iov[0].iov_base = (char *)req;
4308 iov[0].iov_len = total_len;
4309
4310 return 0;
4311 }
4312
4313 int
4314 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4315 u64 volatile_fid)
4316 {
4317 struct cifs_ses *ses = tcon->ses;
4318 struct smb_rqst rqst;
4319 struct kvec iov[1];
4320 struct kvec rsp_iov = {NULL, 0};
4321 struct TCP_Server_Info *server;
4322 int resp_buftype = CIFS_NO_BUFFER;
4323 int flags = 0;
4324 int rc = 0;
4325 int retries = 0, cur_sleep = 1;
4326
4327 replay_again:
4328 /* reinitialize for possible replay */
4329 flags = 0;
4330 server = cifs_pick_channel(ses);
4331
4332 cifs_dbg(FYI, "flush\n");
4333 if (!ses || !(ses->server))
4334 return -EIO;
4335
4336 if (smb3_encryption_required(tcon))
4337 flags |= CIFS_TRANSFORM_REQ;
4338
4339 memset(&rqst, 0, sizeof(struct smb_rqst));
4340 memset(&iov, 0, sizeof(iov));
4341 rqst.rq_iov = iov;
4342 rqst.rq_nvec = 1;
4343
4344 rc = SMB2_flush_init(xid, &rqst, tcon, server,
4345 persistent_fid, volatile_fid);
4346 if (rc)
4347 goto flush_exit;
4348
4349 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4350
4351 if (retries)
4352 smb2_set_replay(server, &rqst);
4353
4354 rc = cifs_send_recv(xid, ses, server,
4355 &rqst, &resp_buftype, flags, &rsp_iov);
4356
4357 if (rc != 0) {
4358 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4359 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4360 rc);
4361 } else
4362 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4363 ses->Suid);
4364
4365 flush_exit:
4366 SMB2_flush_free(&rqst);
4367 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4368
4369 if (is_replayable_error(rc) &&
4370 smb2_should_replay(tcon, &retries, &cur_sleep))
4371 goto replay_again;
4372
4373 return rc;
4374 }
4375
4376 #ifdef CONFIG_CIFS_SMB_DIRECT
4377 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4378 {
4379 struct TCP_Server_Info *server = io_parms->server;
4380 struct cifs_tcon *tcon = io_parms->tcon;
4381
4382 /* we can only offload if we're connected */
4383 if (!server || !tcon)
4384 return false;
4385
4386 /* we can only offload on an rdma connection */
4387 if (!server->rdma || !server->smbd_conn)
4388 return false;
4389
4390 /* we don't support signed offload yet */
4391 if (server->sign)
4392 return false;
4393
4394 /* we don't support encrypted offload yet */
4395 if (smb3_encryption_required(tcon))
4396 return false;
4397
4398 /* offload also has its overhead, so only do it if desired */
4399 if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4400 return false;
4401
4402 return true;
4403 }
4404 #endif /* CONFIG_CIFS_SMB_DIRECT */
4405
4406 /*
4407 * To form a chain of read requests, any read requests after the first should
4408 * have the end_of_chain boolean set to true.
4409 */
4410 static int
4411 smb2_new_read_req(void **buf, unsigned int *total_len,
4412 struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4413 unsigned int remaining_bytes, int request_type)
4414 {
4415 int rc = -EACCES;
4416 struct smb2_read_req *req = NULL;
4417 struct smb2_hdr *shdr;
4418 struct TCP_Server_Info *server = io_parms->server;
4419
4420 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4421 (void **) &req, total_len);
4422 if (rc)
4423 return rc;
4424
4425 if (server == NULL)
4426 return -ECONNABORTED;
4427
4428 shdr = &req->hdr;
4429 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4430
4431 req->PersistentFileId = io_parms->persistent_fid;
4432 req->VolatileFileId = io_parms->volatile_fid;
4433 req->ReadChannelInfoOffset = 0; /* reserved */
4434 req->ReadChannelInfoLength = 0; /* reserved */
4435 req->Channel = 0; /* reserved */
4436 req->MinimumCount = 0;
4437 req->Length = cpu_to_le32(io_parms->length);
4438 req->Offset = cpu_to_le64(io_parms->offset);
4439
4440 trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4441 rdata ? rdata->subreq.debug_index : 0,
4442 rdata ? rdata->xid : 0,
4443 io_parms->persistent_fid,
4444 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4445 io_parms->offset, io_parms->length);
4446 #ifdef CONFIG_CIFS_SMB_DIRECT
4447 /*
4448 * If we want to do a RDMA write, fill in and append
4449 * smbd_buffer_descriptor_v1 to the end of read request
4450 */
4451 if (rdata && smb3_use_rdma_offload(io_parms)) {
4452 struct smbd_buffer_descriptor_v1 *v1;
4453 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4454
4455 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4456 true, need_invalidate);
4457 if (!rdata->mr)
4458 return -EAGAIN;
4459
4460 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4461 if (need_invalidate)
4462 req->Channel = SMB2_CHANNEL_RDMA_V1;
4463 req->ReadChannelInfoOffset =
4464 cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4465 req->ReadChannelInfoLength =
4466 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4467 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4468 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4469 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4470 v1->length = cpu_to_le32(rdata->mr->mr->length);
4471
4472 *total_len += sizeof(*v1) - 1;
4473 }
4474 #endif
4475 if (request_type & CHAINED_REQUEST) {
4476 if (!(request_type & END_OF_CHAIN)) {
4477 /* next 8-byte aligned request */
4478 *total_len = ALIGN(*total_len, 8);
4479 shdr->NextCommand = cpu_to_le32(*total_len);
4480 } else /* END_OF_CHAIN */
4481 shdr->NextCommand = 0;
4482 if (request_type & RELATED_REQUEST) {
4483 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4484 /*
4485 * Related requests use info from previous read request
4486 * in chain.
4487 */
4488 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4489 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4490 req->PersistentFileId = (u64)-1;
4491 req->VolatileFileId = (u64)-1;
4492 }
4493 }
4494 if (remaining_bytes > io_parms->length)
4495 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4496 else
4497 req->RemainingBytes = 0;
4498
4499 *buf = req;
4500 return rc;
4501 }
4502
4503 static void smb2_readv_worker(struct work_struct *work)
4504 {
4505 struct cifs_io_subrequest *rdata =
4506 container_of(work, struct cifs_io_subrequest, subreq.work);
4507
4508 netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false);
4509 }
4510
4511 static void
4512 smb2_readv_callback(struct mid_q_entry *mid)
4513 {
4514 struct cifs_io_subrequest *rdata = mid->callback_data;
4515 struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
4516 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4517 struct TCP_Server_Info *server = rdata->server;
4518 struct smb2_hdr *shdr =
4519 (struct smb2_hdr *)rdata->iov[0].iov_base;
4520 struct cifs_credits credits = {
4521 .value = 0,
4522 .instance = 0,
4523 .rreq_debug_id = rdata->rreq->debug_id,
4524 .rreq_debug_index = rdata->subreq.debug_index,
4525 };
4526 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4527 unsigned int rreq_debug_id = rdata->rreq->debug_id;
4528 unsigned int subreq_debug_index = rdata->subreq.debug_index;
4529
4530 if (rdata->got_bytes) {
4531 rqst.rq_iter = rdata->subreq.io_iter;
4532 }
4533
4534 WARN_ONCE(rdata->server != mid->server,
4535 "rdata server %p != mid server %p",
4536 rdata->server, mid->server);
4537
4538 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
4539 __func__, mid->mid, mid->mid_state, rdata->result,
4540 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
4541
4542 switch (mid->mid_state) {
4543 case MID_RESPONSE_RECEIVED:
4544 credits.value = le16_to_cpu(shdr->CreditRequest);
4545 credits.instance = server->reconnect_instance;
4546 /* result already set, check signature */
4547 if (server->sign && !mid->decrypted) {
4548 int rc;
4549
4550 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4551 rc = smb2_verify_signature(&rqst, server);
4552 if (rc)
4553 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4554 rc);
4555 }
4556 /* FIXME: should this be counted toward the initiating task? */
4557 task_io_account_read(rdata->got_bytes);
4558 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4559 break;
4560 case MID_REQUEST_SUBMITTED:
4561 case MID_RETRY_NEEDED:
4562 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
4563 rdata->result = -EAGAIN;
4564 if (server->sign && rdata->got_bytes)
4565 /* reset bytes number since we can not check a sign */
4566 rdata->got_bytes = 0;
4567 /* FIXME: should this be counted toward the initiating task? */
4568 task_io_account_read(rdata->got_bytes);
4569 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4570 break;
4571 case MID_RESPONSE_MALFORMED:
4572 credits.value = le16_to_cpu(shdr->CreditRequest);
4573 credits.instance = server->reconnect_instance;
4574 fallthrough;
4575 default:
4576 rdata->result = -EIO;
4577 }
4578 #ifdef CONFIG_CIFS_SMB_DIRECT
4579 /*
4580 * If this rdata has a memory registered, the MR can be freed
4581 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4582 * because they have limited number and are used for future I/Os
4583 */
4584 if (rdata->mr) {
4585 smbd_deregister_mr(rdata->mr);
4586 rdata->mr = NULL;
4587 }
4588 #endif
4589 if (rdata->result && rdata->result != -ENODATA) {
4590 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4591 trace_smb3_read_err(rdata->rreq->debug_id,
4592 rdata->subreq.debug_index,
4593 rdata->xid,
4594 rdata->req->cfile->fid.persistent_fid,
4595 tcon->tid, tcon->ses->Suid,
4596 rdata->subreq.start + rdata->subreq.transferred,
4597 rdata->subreq.len - rdata->subreq.transferred,
4598 rdata->result);
4599 } else
4600 trace_smb3_read_done(rdata->rreq->debug_id,
4601 rdata->subreq.debug_index,
4602 rdata->xid,
4603 rdata->req->cfile->fid.persistent_fid,
4604 tcon->tid, tcon->ses->Suid,
4605 rdata->subreq.start + rdata->subreq.transferred,
4606 rdata->got_bytes);
4607
4608 if (rdata->result == -ENODATA) {
4609 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4610 rdata->result = 0;
4611 } else {
4612 size_t trans = rdata->subreq.transferred + rdata->got_bytes;
4613 if (trans < rdata->subreq.len &&
4614 rdata->subreq.start + trans == ictx->remote_i_size) {
4615 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4616 rdata->result = 0;
4617 }
4618 }
4619 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4620 server->credits, server->in_flight,
4621 0, cifs_trace_rw_credits_read_response_clear);
4622 rdata->credits.value = 0;
4623 rdata->subreq.transferred += rdata->got_bytes;
4624 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
4625 INIT_WORK(&rdata->subreq.work, smb2_readv_worker);
4626 queue_work(cifsiod_wq, &rdata->subreq.work);
4627 release_mid(mid);
4628 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4629 server->credits, server->in_flight,
4630 credits.value, cifs_trace_rw_credits_read_response_add);
4631 add_credits(server, &credits, 0);
4632 }
4633
4634 /* smb2_async_readv - send an async read, and set up mid to handle result */
4635 int
4636 smb2_async_readv(struct cifs_io_subrequest *rdata)
4637 {
4638 int rc, flags = 0;
4639 char *buf;
4640 struct netfs_io_subrequest *subreq = &rdata->subreq;
4641 struct smb2_hdr *shdr;
4642 struct cifs_io_parms io_parms;
4643 struct smb_rqst rqst = { .rq_iov = rdata->iov,
4644 .rq_nvec = 1 };
4645 struct TCP_Server_Info *server;
4646 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4647 unsigned int total_len;
4648 int credit_request;
4649
4650 cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4651 __func__, subreq->start, subreq->len);
4652
4653 if (!rdata->server)
4654 rdata->server = cifs_pick_channel(tcon->ses);
4655
4656 io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4657 io_parms.server = server = rdata->server;
4658 io_parms.offset = subreq->start + subreq->transferred;
4659 io_parms.length = subreq->len - subreq->transferred;
4660 io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4661 io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4662 io_parms.pid = rdata->req->pid;
4663
4664 rc = smb2_new_read_req(
4665 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4666 if (rc)
4667 return rc;
4668
4669 if (smb3_encryption_required(io_parms.tcon))
4670 flags |= CIFS_TRANSFORM_REQ;
4671
4672 rdata->iov[0].iov_base = buf;
4673 rdata->iov[0].iov_len = total_len;
4674 rdata->got_bytes = 0;
4675 rdata->result = 0;
4676
4677 shdr = (struct smb2_hdr *)buf;
4678
4679 if (rdata->credits.value > 0) {
4680 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
4681 SMB2_MAX_BUFFER_SIZE));
4682 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4683 if (server->credits >= server->max_credits)
4684 shdr->CreditRequest = cpu_to_le16(0);
4685 else
4686 shdr->CreditRequest = cpu_to_le16(
4687 min_t(int, server->max_credits -
4688 server->credits, credit_request));
4689
4690 rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4691 if (rc)
4692 goto async_readv_out;
4693
4694 flags |= CIFS_HAS_CREDITS;
4695 }
4696
4697 rc = cifs_call_async(server, &rqst,
4698 cifs_readv_receive, smb2_readv_callback,
4699 smb3_handle_read_data, rdata, flags,
4700 &rdata->credits);
4701 if (rc) {
4702 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4703 trace_smb3_read_err(rdata->rreq->debug_id,
4704 subreq->debug_index,
4705 rdata->xid, io_parms.persistent_fid,
4706 io_parms.tcon->tid,
4707 io_parms.tcon->ses->Suid,
4708 io_parms.offset,
4709 subreq->len - subreq->transferred, rc);
4710 }
4711
4712 async_readv_out:
4713 cifs_small_buf_release(buf);
4714 return rc;
4715 }
4716
4717 int
4718 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4719 unsigned int *nbytes, char **buf, int *buf_type)
4720 {
4721 struct smb_rqst rqst;
4722 int resp_buftype, rc;
4723 struct smb2_read_req *req = NULL;
4724 struct smb2_read_rsp *rsp = NULL;
4725 struct kvec iov[1];
4726 struct kvec rsp_iov;
4727 unsigned int total_len;
4728 int flags = CIFS_LOG_ERROR;
4729 struct cifs_ses *ses = io_parms->tcon->ses;
4730
4731 if (!io_parms->server)
4732 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4733
4734 *nbytes = 0;
4735 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4736 if (rc)
4737 return rc;
4738
4739 if (smb3_encryption_required(io_parms->tcon))
4740 flags |= CIFS_TRANSFORM_REQ;
4741
4742 iov[0].iov_base = (char *)req;
4743 iov[0].iov_len = total_len;
4744
4745 memset(&rqst, 0, sizeof(struct smb_rqst));
4746 rqst.rq_iov = iov;
4747 rqst.rq_nvec = 1;
4748
4749 rc = cifs_send_recv(xid, ses, io_parms->server,
4750 &rqst, &resp_buftype, flags, &rsp_iov);
4751 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4752
4753 if (rc) {
4754 if (rc != -ENODATA) {
4755 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4756 cifs_dbg(VFS, "Send error in read = %d\n", rc);
4757 trace_smb3_read_err(0, 0, xid,
4758 req->PersistentFileId,
4759 io_parms->tcon->tid, ses->Suid,
4760 io_parms->offset, io_parms->length,
4761 rc);
4762 } else
4763 trace_smb3_read_done(0, 0, xid,
4764 req->PersistentFileId, io_parms->tcon->tid,
4765 ses->Suid, io_parms->offset, 0);
4766 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4767 cifs_small_buf_release(req);
4768 return rc == -ENODATA ? 0 : rc;
4769 } else
4770 trace_smb3_read_done(0, 0, xid,
4771 req->PersistentFileId,
4772 io_parms->tcon->tid, ses->Suid,
4773 io_parms->offset, io_parms->length);
4774
4775 cifs_small_buf_release(req);
4776
4777 *nbytes = le32_to_cpu(rsp->DataLength);
4778 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4779 (*nbytes > io_parms->length)) {
4780 cifs_dbg(FYI, "bad length %d for count %d\n",
4781 *nbytes, io_parms->length);
4782 rc = -EIO;
4783 *nbytes = 0;
4784 }
4785
4786 if (*buf) {
4787 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4788 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4789 } else if (resp_buftype != CIFS_NO_BUFFER) {
4790 *buf = rsp_iov.iov_base;
4791 if (resp_buftype == CIFS_SMALL_BUFFER)
4792 *buf_type = CIFS_SMALL_BUFFER;
4793 else if (resp_buftype == CIFS_LARGE_BUFFER)
4794 *buf_type = CIFS_LARGE_BUFFER;
4795 }
4796 return rc;
4797 }
4798
4799 /*
4800 * Check the mid_state and signature on received buffer (if any), and queue the
4801 * workqueue completion task.
4802 */
4803 static void
4804 smb2_writev_callback(struct mid_q_entry *mid)
4805 {
4806 struct cifs_io_subrequest *wdata = mid->callback_data;
4807 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4808 struct TCP_Server_Info *server = wdata->server;
4809 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4810 struct cifs_credits credits = {
4811 .value = 0,
4812 .instance = 0,
4813 .rreq_debug_id = wdata->rreq->debug_id,
4814 .rreq_debug_index = wdata->subreq.debug_index,
4815 };
4816 unsigned int rreq_debug_id = wdata->rreq->debug_id;
4817 unsigned int subreq_debug_index = wdata->subreq.debug_index;
4818 ssize_t result = 0;
4819 size_t written;
4820
4821 WARN_ONCE(wdata->server != mid->server,
4822 "wdata server %p != mid server %p",
4823 wdata->server, mid->server);
4824
4825 switch (mid->mid_state) {
4826 case MID_RESPONSE_RECEIVED:
4827 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4828 credits.instance = server->reconnect_instance;
4829 result = smb2_check_receive(mid, server, 0);
4830 if (result != 0)
4831 break;
4832
4833 written = le32_to_cpu(rsp->DataLength);
4834 /*
4835 * Mask off high 16 bits when bytes written as returned
4836 * by the server is greater than bytes requested by the
4837 * client. OS/2 servers are known to set incorrect
4838 * CountHigh values.
4839 */
4840 if (written > wdata->subreq.len)
4841 written &= 0xFFFF;
4842
4843 if (written < wdata->subreq.len)
4844 wdata->result = -ENOSPC;
4845 else
4846 wdata->subreq.len = written;
4847 break;
4848 case MID_REQUEST_SUBMITTED:
4849 case MID_RETRY_NEEDED:
4850 result = -EAGAIN;
4851 break;
4852 case MID_RESPONSE_MALFORMED:
4853 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4854 credits.instance = server->reconnect_instance;
4855 fallthrough;
4856 default:
4857 result = -EIO;
4858 break;
4859 }
4860 #ifdef CONFIG_CIFS_SMB_DIRECT
4861 /*
4862 * If this wdata has a memory registered, the MR can be freed
4863 * The number of MRs available is limited, it's important to recover
4864 * used MR as soon as I/O is finished. Hold MR longer in the later
4865 * I/O process can possibly result in I/O deadlock due to lack of MR
4866 * to send request on I/O retry
4867 */
4868 if (wdata->mr) {
4869 smbd_deregister_mr(wdata->mr);
4870 wdata->mr = NULL;
4871 }
4872 #endif
4873 if (result) {
4874 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4875 trace_smb3_write_err(wdata->rreq->debug_id,
4876 wdata->subreq.debug_index,
4877 wdata->xid,
4878 wdata->req->cfile->fid.persistent_fid,
4879 tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4880 wdata->subreq.len, wdata->result);
4881 if (wdata->result == -ENOSPC)
4882 pr_warn_once("Out of space writing to %s\n",
4883 tcon->tree_name);
4884 } else
4885 trace_smb3_write_done(wdata->rreq->debug_id,
4886 wdata->subreq.debug_index,
4887 wdata->xid,
4888 wdata->req->cfile->fid.persistent_fid,
4889 tcon->tid, tcon->ses->Suid,
4890 wdata->subreq.start, wdata->subreq.len);
4891
4892 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4893 server->credits, server->in_flight,
4894 0, cifs_trace_rw_credits_write_response_clear);
4895 wdata->credits.value = 0;
4896 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
4897 cifs_write_subrequest_terminated(wdata, result ?: written, true);
4898 release_mid(mid);
4899 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4900 server->credits, server->in_flight,
4901 credits.value, cifs_trace_rw_credits_write_response_add);
4902 add_credits(server, &credits, 0);
4903 }
4904
4905 /* smb2_async_writev - send an async write, and set up mid to handle result */
4906 void
4907 smb2_async_writev(struct cifs_io_subrequest *wdata)
4908 {
4909 int rc = -EACCES, flags = 0;
4910 struct smb2_write_req *req = NULL;
4911 struct smb2_hdr *shdr;
4912 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4913 struct TCP_Server_Info *server = wdata->server;
4914 struct kvec iov[1];
4915 struct smb_rqst rqst = { };
4916 unsigned int total_len, xid = wdata->xid;
4917 struct cifs_io_parms _io_parms;
4918 struct cifs_io_parms *io_parms = NULL;
4919 int credit_request;
4920
4921 /*
4922 * in future we may get cifs_io_parms passed in from the caller,
4923 * but for now we construct it here...
4924 */
4925 _io_parms = (struct cifs_io_parms) {
4926 .tcon = tcon,
4927 .server = server,
4928 .offset = wdata->subreq.start,
4929 .length = wdata->subreq.len,
4930 .persistent_fid = wdata->req->cfile->fid.persistent_fid,
4931 .volatile_fid = wdata->req->cfile->fid.volatile_fid,
4932 .pid = wdata->req->pid,
4933 };
4934 io_parms = &_io_parms;
4935
4936 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4937 (void **) &req, &total_len);
4938 if (rc)
4939 goto out;
4940
4941 rqst.rq_iov = iov;
4942 rqst.rq_iter = wdata->subreq.io_iter;
4943
4944 rqst.rq_iov[0].iov_len = total_len - 1;
4945 rqst.rq_iov[0].iov_base = (char *)req;
4946 rqst.rq_nvec += 1;
4947
4948 if (smb3_encryption_required(tcon))
4949 flags |= CIFS_TRANSFORM_REQ;
4950
4951 shdr = (struct smb2_hdr *)req;
4952 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4953
4954 req->PersistentFileId = io_parms->persistent_fid;
4955 req->VolatileFileId = io_parms->volatile_fid;
4956 req->WriteChannelInfoOffset = 0;
4957 req->WriteChannelInfoLength = 0;
4958 req->Channel = SMB2_CHANNEL_NONE;
4959 req->Length = cpu_to_le32(io_parms->length);
4960 req->Offset = cpu_to_le64(io_parms->offset);
4961 req->DataOffset = cpu_to_le16(
4962 offsetof(struct smb2_write_req, Buffer));
4963 req->RemainingBytes = 0;
4964
4965 trace_smb3_write_enter(wdata->rreq->debug_id,
4966 wdata->subreq.debug_index,
4967 wdata->xid,
4968 io_parms->persistent_fid,
4969 io_parms->tcon->tid,
4970 io_parms->tcon->ses->Suid,
4971 io_parms->offset,
4972 io_parms->length);
4973
4974 #ifdef CONFIG_CIFS_SMB_DIRECT
4975 /*
4976 * If we want to do a server RDMA read, fill in and append
4977 * smbd_buffer_descriptor_v1 to the end of write request
4978 */
4979 if (smb3_use_rdma_offload(io_parms)) {
4980 struct smbd_buffer_descriptor_v1 *v1;
4981 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4982
4983 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
4984 false, need_invalidate);
4985 if (!wdata->mr) {
4986 rc = -EAGAIN;
4987 goto async_writev_out;
4988 }
4989 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4990 req->RemainingBytes = req->Length;
4991 req->Length = 0;
4992 req->DataOffset = 0;
4993 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4994 if (need_invalidate)
4995 req->Channel = SMB2_CHANNEL_RDMA_V1;
4996 req->WriteChannelInfoOffset =
4997 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4998 req->WriteChannelInfoLength =
4999 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
5000 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
5001 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
5002 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
5003 v1->length = cpu_to_le32(wdata->mr->mr->length);
5004
5005 rqst.rq_iov[0].iov_len += sizeof(*v1);
5006
5007 /*
5008 * We keep wdata->subreq.io_iter,
5009 * but we have to truncate rqst.rq_iter
5010 */
5011 iov_iter_truncate(&rqst.rq_iter, 0);
5012 }
5013 #endif
5014
5015 if (test_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags))
5016 smb2_set_replay(server, &rqst);
5017
5018 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
5019 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
5020
5021 if (wdata->credits.value > 0) {
5022 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
5023 SMB2_MAX_BUFFER_SIZE));
5024 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
5025 if (server->credits >= server->max_credits)
5026 shdr->CreditRequest = cpu_to_le16(0);
5027 else
5028 shdr->CreditRequest = cpu_to_le16(
5029 min_t(int, server->max_credits -
5030 server->credits, credit_request));
5031
5032 rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
5033 if (rc)
5034 goto async_writev_out;
5035
5036 flags |= CIFS_HAS_CREDITS;
5037 }
5038
5039 /* XXX: compression + encryption is unsupported for now */
5040 if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
5041 flags |= CIFS_COMPRESS_REQ;
5042
5043 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5044 wdata, flags, &wdata->credits);
5045 /* Can't touch wdata if rc == 0 */
5046 if (rc) {
5047 trace_smb3_write_err(wdata->rreq->debug_id,
5048 wdata->subreq.debug_index,
5049 xid,
5050 io_parms->persistent_fid,
5051 io_parms->tcon->tid,
5052 io_parms->tcon->ses->Suid,
5053 io_parms->offset,
5054 io_parms->length,
5055 rc);
5056 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5057 }
5058
5059 async_writev_out:
5060 cifs_small_buf_release(req);
5061 out:
5062 if (rc) {
5063 trace_smb3_rw_credits(wdata->rreq->debug_id,
5064 wdata->subreq.debug_index,
5065 wdata->credits.value,
5066 server->credits, server->in_flight,
5067 -(int)wdata->credits.value,
5068 cifs_trace_rw_credits_write_response_clear);
5069 add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5070 cifs_write_subrequest_terminated(wdata, rc, true);
5071 }
5072 }
5073
5074 /*
5075 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5076 * The length field from io_parms must be at least 1 and indicates a number of
5077 * elements with data to write that begins with position 1 in iov array. All
5078 * data length is specified by count.
5079 */
5080 int
5081 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5082 unsigned int *nbytes, struct kvec *iov, int n_vec)
5083 {
5084 struct smb_rqst rqst;
5085 int rc = 0;
5086 struct smb2_write_req *req = NULL;
5087 struct smb2_write_rsp *rsp = NULL;
5088 int resp_buftype;
5089 struct kvec rsp_iov;
5090 int flags = 0;
5091 unsigned int total_len;
5092 struct TCP_Server_Info *server;
5093 int retries = 0, cur_sleep = 1;
5094
5095 replay_again:
5096 /* reinitialize for possible replay */
5097 flags = 0;
5098 *nbytes = 0;
5099 if (!io_parms->server)
5100 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5101 server = io_parms->server;
5102 if (server == NULL)
5103 return -ECONNABORTED;
5104
5105 if (n_vec < 1)
5106 return rc;
5107
5108 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5109 (void **) &req, &total_len);
5110 if (rc)
5111 return rc;
5112
5113 if (smb3_encryption_required(io_parms->tcon))
5114 flags |= CIFS_TRANSFORM_REQ;
5115
5116 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5117
5118 req->PersistentFileId = io_parms->persistent_fid;
5119 req->VolatileFileId = io_parms->volatile_fid;
5120 req->WriteChannelInfoOffset = 0;
5121 req->WriteChannelInfoLength = 0;
5122 req->Channel = 0;
5123 req->Length = cpu_to_le32(io_parms->length);
5124 req->Offset = cpu_to_le64(io_parms->offset);
5125 req->DataOffset = cpu_to_le16(
5126 offsetof(struct smb2_write_req, Buffer));
5127 req->RemainingBytes = 0;
5128
5129 trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
5130 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5131 io_parms->offset, io_parms->length);
5132
5133 iov[0].iov_base = (char *)req;
5134 /* 1 for Buffer */
5135 iov[0].iov_len = total_len - 1;
5136
5137 memset(&rqst, 0, sizeof(struct smb_rqst));
5138 rqst.rq_iov = iov;
5139 rqst.rq_nvec = n_vec + 1;
5140
5141 if (retries)
5142 smb2_set_replay(server, &rqst);
5143
5144 rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5145 &rqst,
5146 &resp_buftype, flags, &rsp_iov);
5147 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5148
5149 if (rc) {
5150 trace_smb3_write_err(0, 0, xid,
5151 req->PersistentFileId,
5152 io_parms->tcon->tid,
5153 io_parms->tcon->ses->Suid,
5154 io_parms->offset, io_parms->length, rc);
5155 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5156 cifs_dbg(VFS, "Send error in write = %d\n", rc);
5157 } else {
5158 *nbytes = le32_to_cpu(rsp->DataLength);
5159 trace_smb3_write_done(0, 0, xid,
5160 req->PersistentFileId,
5161 io_parms->tcon->tid,
5162 io_parms->tcon->ses->Suid,
5163 io_parms->offset, *nbytes);
5164 }
5165
5166 cifs_small_buf_release(req);
5167 free_rsp_buf(resp_buftype, rsp);
5168
5169 if (is_replayable_error(rc) &&
5170 smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5171 goto replay_again;
5172
5173 return rc;
5174 }
5175
5176 int posix_info_sid_size(const void *beg, const void *end)
5177 {
5178 size_t subauth;
5179 int total;
5180
5181 if (beg + 1 > end)
5182 return -1;
5183
5184 subauth = *(u8 *)(beg+1);
5185 if (subauth < 1 || subauth > 15)
5186 return -1;
5187
5188 total = 1 + 1 + 6 + 4*subauth;
5189 if (beg + total > end)
5190 return -1;
5191
5192 return total;
5193 }
5194
5195 int posix_info_parse(const void *beg, const void *end,
5196 struct smb2_posix_info_parsed *out)
5197
5198 {
5199 int total_len = 0;
5200 int owner_len, group_len;
5201 int name_len;
5202 const void *owner_sid;
5203 const void *group_sid;
5204 const void *name;
5205
5206 /* if no end bound given, assume payload to be correct */
5207 if (!end) {
5208 const struct smb2_posix_info *p = beg;
5209
5210 end = beg + le32_to_cpu(p->NextEntryOffset);
5211 /* last element will have a 0 offset, pick a sensible bound */
5212 if (end == beg)
5213 end += 0xFFFF;
5214 }
5215
5216 /* check base buf */
5217 if (beg + sizeof(struct smb2_posix_info) > end)
5218 return -1;
5219 total_len = sizeof(struct smb2_posix_info);
5220
5221 /* check owner sid */
5222 owner_sid = beg + total_len;
5223 owner_len = posix_info_sid_size(owner_sid, end);
5224 if (owner_len < 0)
5225 return -1;
5226 total_len += owner_len;
5227
5228 /* check group sid */
5229 group_sid = beg + total_len;
5230 group_len = posix_info_sid_size(group_sid, end);
5231 if (group_len < 0)
5232 return -1;
5233 total_len += group_len;
5234
5235 /* check name len */
5236 if (beg + total_len + 4 > end)
5237 return -1;
5238 name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5239 if (name_len < 1 || name_len > 0xFFFF)
5240 return -1;
5241 total_len += 4;
5242
5243 /* check name */
5244 name = beg + total_len;
5245 if (name + name_len > end)
5246 return -1;
5247 total_len += name_len;
5248
5249 if (out) {
5250 out->base = beg;
5251 out->size = total_len;
5252 out->name_len = name_len;
5253 out->name = name;
5254 memcpy(&out->owner, owner_sid, owner_len);
5255 memcpy(&out->group, group_sid, group_len);
5256 }
5257 return total_len;
5258 }
5259
5260 static int posix_info_extra_size(const void *beg, const void *end)
5261 {
5262 int len = posix_info_parse(beg, end, NULL);
5263
5264 if (len < 0)
5265 return -1;
5266 return len - sizeof(struct smb2_posix_info);
5267 }
5268
5269 static unsigned int
5270 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5271 size_t size)
5272 {
5273 int len;
5274 unsigned int entrycount = 0;
5275 unsigned int next_offset = 0;
5276 char *entryptr;
5277 FILE_DIRECTORY_INFO *dir_info;
5278
5279 if (bufstart == NULL)
5280 return 0;
5281
5282 entryptr = bufstart;
5283
5284 while (1) {
5285 if (entryptr + next_offset < entryptr ||
5286 entryptr + next_offset > end_of_buf ||
5287 entryptr + next_offset + size > end_of_buf) {
5288 cifs_dbg(VFS, "malformed search entry would overflow\n");
5289 break;
5290 }
5291
5292 entryptr = entryptr + next_offset;
5293 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5294
5295 if (infotype == SMB_FIND_FILE_POSIX_INFO)
5296 len = posix_info_extra_size(entryptr, end_of_buf);
5297 else
5298 len = le32_to_cpu(dir_info->FileNameLength);
5299
5300 if (len < 0 ||
5301 entryptr + len < entryptr ||
5302 entryptr + len > end_of_buf ||
5303 entryptr + len + size > end_of_buf) {
5304 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5305 end_of_buf);
5306 break;
5307 }
5308
5309 *lastentry = entryptr;
5310 entrycount++;
5311
5312 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5313 if (!next_offset)
5314 break;
5315 }
5316
5317 return entrycount;
5318 }
5319
5320 /*
5321 * Readdir/FindFirst
5322 */
5323 int SMB2_query_directory_init(const unsigned int xid,
5324 struct cifs_tcon *tcon,
5325 struct TCP_Server_Info *server,
5326 struct smb_rqst *rqst,
5327 u64 persistent_fid, u64 volatile_fid,
5328 int index, int info_level)
5329 {
5330 struct smb2_query_directory_req *req;
5331 unsigned char *bufptr;
5332 __le16 asteriks = cpu_to_le16('*');
5333 unsigned int output_size = CIFSMaxBufSize -
5334 MAX_SMB2_CREATE_RESPONSE_SIZE -
5335 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5336 unsigned int total_len;
5337 struct kvec *iov = rqst->rq_iov;
5338 int len, rc;
5339
5340 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5341 (void **) &req, &total_len);
5342 if (rc)
5343 return rc;
5344
5345 switch (info_level) {
5346 case SMB_FIND_FILE_DIRECTORY_INFO:
5347 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5348 break;
5349 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5350 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5351 break;
5352 case SMB_FIND_FILE_POSIX_INFO:
5353 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5354 break;
5355 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5356 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5357 break;
5358 default:
5359 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5360 info_level);
5361 return -EINVAL;
5362 }
5363
5364 req->FileIndex = cpu_to_le32(index);
5365 req->PersistentFileId = persistent_fid;
5366 req->VolatileFileId = volatile_fid;
5367
5368 len = 0x2;
5369 bufptr = req->Buffer;
5370 memcpy(bufptr, &asteriks, len);
5371
5372 req->FileNameOffset =
5373 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5374 req->FileNameLength = cpu_to_le16(len);
5375 /*
5376 * BB could be 30 bytes or so longer if we used SMB2 specific
5377 * buffer lengths, but this is safe and close enough.
5378 */
5379 output_size = min_t(unsigned int, output_size, server->maxBuf);
5380 output_size = min_t(unsigned int, output_size, 2 << 15);
5381 req->OutputBufferLength = cpu_to_le32(output_size);
5382
5383 iov[0].iov_base = (char *)req;
5384 /* 1 for Buffer */
5385 iov[0].iov_len = total_len - 1;
5386
5387 iov[1].iov_base = (char *)(req->Buffer);
5388 iov[1].iov_len = len;
5389
5390 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5391 tcon->ses->Suid, index, output_size);
5392
5393 return 0;
5394 }
5395
5396 void SMB2_query_directory_free(struct smb_rqst *rqst)
5397 {
5398 if (rqst && rqst->rq_iov) {
5399 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5400 }
5401 }
5402
5403 int
5404 smb2_parse_query_directory(struct cifs_tcon *tcon,
5405 struct kvec *rsp_iov,
5406 int resp_buftype,
5407 struct cifs_search_info *srch_inf)
5408 {
5409 struct smb2_query_directory_rsp *rsp;
5410 size_t info_buf_size;
5411 char *end_of_smb;
5412 int rc;
5413
5414 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5415
5416 switch (srch_inf->info_level) {
5417 case SMB_FIND_FILE_DIRECTORY_INFO:
5418 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5419 break;
5420 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5421 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5422 break;
5423 case SMB_FIND_FILE_POSIX_INFO:
5424 /* note that posix payload are variable size */
5425 info_buf_size = sizeof(struct smb2_posix_info);
5426 break;
5427 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5428 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5429 break;
5430 default:
5431 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5432 srch_inf->info_level);
5433 return -EINVAL;
5434 }
5435
5436 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5437 le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5438 info_buf_size);
5439 if (rc) {
5440 cifs_tcon_dbg(VFS, "bad info payload");
5441 return rc;
5442 }
5443
5444 srch_inf->unicode = true;
5445
5446 if (srch_inf->ntwrk_buf_start) {
5447 if (srch_inf->smallBuf)
5448 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5449 else
5450 cifs_buf_release(srch_inf->ntwrk_buf_start);
5451 }
5452 srch_inf->ntwrk_buf_start = (char *)rsp;
5453 srch_inf->srch_entries_start = srch_inf->last_entry =
5454 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5455 end_of_smb = rsp_iov->iov_len + (char *)rsp;
5456
5457 srch_inf->entries_in_buffer = num_entries(
5458 srch_inf->info_level,
5459 srch_inf->srch_entries_start,
5460 end_of_smb,
5461 &srch_inf->last_entry,
5462 info_buf_size);
5463
5464 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5465 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5466 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5467 srch_inf->srch_entries_start, srch_inf->last_entry);
5468 if (resp_buftype == CIFS_LARGE_BUFFER)
5469 srch_inf->smallBuf = false;
5470 else if (resp_buftype == CIFS_SMALL_BUFFER)
5471 srch_inf->smallBuf = true;
5472 else
5473 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5474
5475 return 0;
5476 }
5477
5478 int
5479 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5480 u64 persistent_fid, u64 volatile_fid, int index,
5481 struct cifs_search_info *srch_inf)
5482 {
5483 struct smb_rqst rqst;
5484 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5485 struct smb2_query_directory_rsp *rsp = NULL;
5486 int resp_buftype = CIFS_NO_BUFFER;
5487 struct kvec rsp_iov;
5488 int rc = 0;
5489 struct cifs_ses *ses = tcon->ses;
5490 struct TCP_Server_Info *server;
5491 int flags = 0;
5492 int retries = 0, cur_sleep = 1;
5493
5494 replay_again:
5495 /* reinitialize for possible replay */
5496 flags = 0;
5497 server = cifs_pick_channel(ses);
5498
5499 if (!ses || !(ses->server))
5500 return -EIO;
5501
5502 if (smb3_encryption_required(tcon))
5503 flags |= CIFS_TRANSFORM_REQ;
5504
5505 memset(&rqst, 0, sizeof(struct smb_rqst));
5506 memset(&iov, 0, sizeof(iov));
5507 rqst.rq_iov = iov;
5508 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5509
5510 rc = SMB2_query_directory_init(xid, tcon, server,
5511 &rqst, persistent_fid,
5512 volatile_fid, index,
5513 srch_inf->info_level);
5514 if (rc)
5515 goto qdir_exit;
5516
5517 if (retries)
5518 smb2_set_replay(server, &rqst);
5519
5520 rc = cifs_send_recv(xid, ses, server,
5521 &rqst, &resp_buftype, flags, &rsp_iov);
5522 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5523
5524 if (rc) {
5525 if (rc == -ENODATA &&
5526 rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5527 trace_smb3_query_dir_done(xid, persistent_fid,
5528 tcon->tid, tcon->ses->Suid, index, 0);
5529 srch_inf->endOfSearch = true;
5530 rc = 0;
5531 } else {
5532 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5533 tcon->ses->Suid, index, 0, rc);
5534 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5535 }
5536 goto qdir_exit;
5537 }
5538
5539 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5540 srch_inf);
5541 if (rc) {
5542 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5543 tcon->ses->Suid, index, 0, rc);
5544 goto qdir_exit;
5545 }
5546 resp_buftype = CIFS_NO_BUFFER;
5547
5548 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5549 tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5550
5551 qdir_exit:
5552 SMB2_query_directory_free(&rqst);
5553 free_rsp_buf(resp_buftype, rsp);
5554
5555 if (is_replayable_error(rc) &&
5556 smb2_should_replay(tcon, &retries, &cur_sleep))
5557 goto replay_again;
5558
5559 return rc;
5560 }
5561
5562 int
5563 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5564 struct smb_rqst *rqst,
5565 u64 persistent_fid, u64 volatile_fid, u32 pid,
5566 u8 info_class, u8 info_type, u32 additional_info,
5567 void **data, unsigned int *size)
5568 {
5569 struct smb2_set_info_req *req;
5570 struct kvec *iov = rqst->rq_iov;
5571 unsigned int i, total_len;
5572 int rc;
5573
5574 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5575 (void **) &req, &total_len);
5576 if (rc)
5577 return rc;
5578
5579 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5580 req->InfoType = info_type;
5581 req->FileInfoClass = info_class;
5582 req->PersistentFileId = persistent_fid;
5583 req->VolatileFileId = volatile_fid;
5584 req->AdditionalInformation = cpu_to_le32(additional_info);
5585
5586 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5587 req->BufferLength = cpu_to_le32(*size);
5588
5589 memcpy(req->Buffer, *data, *size);
5590 total_len += *size;
5591
5592 iov[0].iov_base = (char *)req;
5593 /* 1 for Buffer */
5594 iov[0].iov_len = total_len - 1;
5595
5596 for (i = 1; i < rqst->rq_nvec; i++) {
5597 le32_add_cpu(&req->BufferLength, size[i]);
5598 iov[i].iov_base = (char *)data[i];
5599 iov[i].iov_len = size[i];
5600 }
5601
5602 return 0;
5603 }
5604
5605 void
5606 SMB2_set_info_free(struct smb_rqst *rqst)
5607 {
5608 if (rqst && rqst->rq_iov)
5609 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5610 }
5611
5612 static int
5613 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5614 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5615 u8 info_type, u32 additional_info, unsigned int num,
5616 void **data, unsigned int *size)
5617 {
5618 struct smb_rqst rqst;
5619 struct smb2_set_info_rsp *rsp = NULL;
5620 struct kvec *iov;
5621 struct kvec rsp_iov;
5622 int rc = 0;
5623 int resp_buftype;
5624 struct cifs_ses *ses = tcon->ses;
5625 struct TCP_Server_Info *server;
5626 int flags = 0;
5627 int retries = 0, cur_sleep = 1;
5628
5629 replay_again:
5630 /* reinitialize for possible replay */
5631 flags = 0;
5632 server = cifs_pick_channel(ses);
5633
5634 if (!ses || !server)
5635 return -EIO;
5636
5637 if (!num)
5638 return -EINVAL;
5639
5640 if (smb3_encryption_required(tcon))
5641 flags |= CIFS_TRANSFORM_REQ;
5642
5643 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5644 if (!iov)
5645 return -ENOMEM;
5646
5647 memset(&rqst, 0, sizeof(struct smb_rqst));
5648 rqst.rq_iov = iov;
5649 rqst.rq_nvec = num;
5650
5651 rc = SMB2_set_info_init(tcon, server,
5652 &rqst, persistent_fid, volatile_fid, pid,
5653 info_class, info_type, additional_info,
5654 data, size);
5655 if (rc) {
5656 kfree(iov);
5657 return rc;
5658 }
5659
5660 if (retries)
5661 smb2_set_replay(server, &rqst);
5662
5663 rc = cifs_send_recv(xid, ses, server,
5664 &rqst, &resp_buftype, flags,
5665 &rsp_iov);
5666 SMB2_set_info_free(&rqst);
5667 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5668
5669 if (rc != 0) {
5670 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5671 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5672 ses->Suid, info_class, (__u32)info_type, rc);
5673 }
5674
5675 free_rsp_buf(resp_buftype, rsp);
5676 kfree(iov);
5677
5678 if (is_replayable_error(rc) &&
5679 smb2_should_replay(tcon, &retries, &cur_sleep))
5680 goto replay_again;
5681
5682 return rc;
5683 }
5684
5685 int
5686 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5687 u64 volatile_fid, u32 pid, loff_t new_eof)
5688 {
5689 struct smb2_file_eof_info info;
5690 void *data;
5691 unsigned int size;
5692
5693 info.EndOfFile = cpu_to_le64(new_eof);
5694
5695 data = &info;
5696 size = sizeof(struct smb2_file_eof_info);
5697
5698 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5699
5700 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5701 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5702 0, 1, &data, &size);
5703 }
5704
5705 int
5706 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5707 u64 persistent_fid, u64 volatile_fid,
5708 struct smb_ntsd *pnntsd, int pacllen, int aclflag)
5709 {
5710 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5711 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5712 1, (void **)&pnntsd, &pacllen);
5713 }
5714
5715 int
5716 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5717 u64 persistent_fid, u64 volatile_fid,
5718 struct smb2_file_full_ea_info *buf, int len)
5719 {
5720 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5721 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5722 0, 1, (void **)&buf, &len);
5723 }
5724
5725 int
5726 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5727 const u64 persistent_fid, const u64 volatile_fid,
5728 __u8 oplock_level)
5729 {
5730 struct smb_rqst rqst;
5731 int rc;
5732 struct smb2_oplock_break *req = NULL;
5733 struct cifs_ses *ses = tcon->ses;
5734 struct TCP_Server_Info *server;
5735 int flags = CIFS_OBREAK_OP;
5736 unsigned int total_len;
5737 struct kvec iov[1];
5738 struct kvec rsp_iov;
5739 int resp_buf_type;
5740 int retries = 0, cur_sleep = 1;
5741
5742 replay_again:
5743 /* reinitialize for possible replay */
5744 flags = CIFS_OBREAK_OP;
5745 server = cifs_pick_channel(ses);
5746
5747 cifs_dbg(FYI, "SMB2_oplock_break\n");
5748 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5749 (void **) &req, &total_len);
5750 if (rc)
5751 return rc;
5752
5753 if (smb3_encryption_required(tcon))
5754 flags |= CIFS_TRANSFORM_REQ;
5755
5756 req->VolatileFid = volatile_fid;
5757 req->PersistentFid = persistent_fid;
5758 req->OplockLevel = oplock_level;
5759 req->hdr.CreditRequest = cpu_to_le16(1);
5760
5761 flags |= CIFS_NO_RSP_BUF;
5762
5763 iov[0].iov_base = (char *)req;
5764 iov[0].iov_len = total_len;
5765
5766 memset(&rqst, 0, sizeof(struct smb_rqst));
5767 rqst.rq_iov = iov;
5768 rqst.rq_nvec = 1;
5769
5770 if (retries)
5771 smb2_set_replay(server, &rqst);
5772
5773 rc = cifs_send_recv(xid, ses, server,
5774 &rqst, &resp_buf_type, flags, &rsp_iov);
5775 cifs_small_buf_release(req);
5776 if (rc) {
5777 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5778 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5779 }
5780
5781 if (is_replayable_error(rc) &&
5782 smb2_should_replay(tcon, &retries, &cur_sleep))
5783 goto replay_again;
5784
5785 return rc;
5786 }
5787
5788 void
5789 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5790 struct kstatfs *kst)
5791 {
5792 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5793 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5794 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5795 kst->f_bfree = kst->f_bavail =
5796 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5797 return;
5798 }
5799
5800 static void
5801 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5802 struct kstatfs *kst)
5803 {
5804 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5805 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5806 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
5807 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5808 kst->f_bavail = kst->f_bfree;
5809 else
5810 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5811 if (response_data->TotalFileNodes != cpu_to_le64(-1))
5812 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5813 if (response_data->FreeFileNodes != cpu_to_le64(-1))
5814 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5815
5816 return;
5817 }
5818
5819 static int
5820 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5821 struct TCP_Server_Info *server,
5822 int level, int outbuf_len, u64 persistent_fid,
5823 u64 volatile_fid)
5824 {
5825 int rc;
5826 struct smb2_query_info_req *req;
5827 unsigned int total_len;
5828
5829 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5830
5831 if ((tcon->ses == NULL) || server == NULL)
5832 return -EIO;
5833
5834 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5835 (void **) &req, &total_len);
5836 if (rc)
5837 return rc;
5838
5839 req->InfoType = SMB2_O_INFO_FILESYSTEM;
5840 req->FileInfoClass = level;
5841 req->PersistentFileId = persistent_fid;
5842 req->VolatileFileId = volatile_fid;
5843 /* 1 for pad */
5844 req->InputBufferOffset =
5845 cpu_to_le16(sizeof(struct smb2_query_info_req));
5846 req->OutputBufferLength = cpu_to_le32(
5847 outbuf_len + sizeof(struct smb2_query_info_rsp));
5848
5849 iov->iov_base = (char *)req;
5850 iov->iov_len = total_len;
5851 return 0;
5852 }
5853
5854 static inline void free_qfs_info_req(struct kvec *iov)
5855 {
5856 cifs_buf_release(iov->iov_base);
5857 }
5858
5859 int
5860 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5861 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5862 {
5863 struct smb_rqst rqst;
5864 struct smb2_query_info_rsp *rsp = NULL;
5865 struct kvec iov;
5866 struct kvec rsp_iov;
5867 int rc = 0;
5868 int resp_buftype;
5869 struct cifs_ses *ses = tcon->ses;
5870 struct TCP_Server_Info *server;
5871 FILE_SYSTEM_POSIX_INFO *info = NULL;
5872 int flags = 0;
5873 int retries = 0, cur_sleep = 1;
5874
5875 replay_again:
5876 /* reinitialize for possible replay */
5877 flags = 0;
5878 server = cifs_pick_channel(ses);
5879
5880 rc = build_qfs_info_req(&iov, tcon, server,
5881 FS_POSIX_INFORMATION,
5882 sizeof(FILE_SYSTEM_POSIX_INFO),
5883 persistent_fid, volatile_fid);
5884 if (rc)
5885 return rc;
5886
5887 if (smb3_encryption_required(tcon))
5888 flags |= CIFS_TRANSFORM_REQ;
5889
5890 memset(&rqst, 0, sizeof(struct smb_rqst));
5891 rqst.rq_iov = &iov;
5892 rqst.rq_nvec = 1;
5893
5894 if (retries)
5895 smb2_set_replay(server, &rqst);
5896
5897 rc = cifs_send_recv(xid, ses, server,
5898 &rqst, &resp_buftype, flags, &rsp_iov);
5899 free_qfs_info_req(&iov);
5900 if (rc) {
5901 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5902 goto posix_qfsinf_exit;
5903 }
5904 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5905
5906 info = (FILE_SYSTEM_POSIX_INFO *)(
5907 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5908 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5909 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5910 sizeof(FILE_SYSTEM_POSIX_INFO));
5911 if (!rc)
5912 copy_posix_fs_info_to_kstatfs(info, fsdata);
5913
5914 posix_qfsinf_exit:
5915 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5916
5917 if (is_replayable_error(rc) &&
5918 smb2_should_replay(tcon, &retries, &cur_sleep))
5919 goto replay_again;
5920
5921 return rc;
5922 }
5923
5924 int
5925 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5926 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5927 {
5928 struct smb_rqst rqst;
5929 struct smb2_query_info_rsp *rsp = NULL;
5930 struct kvec iov;
5931 struct kvec rsp_iov;
5932 int rc = 0;
5933 int resp_buftype;
5934 struct cifs_ses *ses = tcon->ses;
5935 struct TCP_Server_Info *server;
5936 struct smb2_fs_full_size_info *info = NULL;
5937 int flags = 0;
5938 int retries = 0, cur_sleep = 1;
5939
5940 replay_again:
5941 /* reinitialize for possible replay */
5942 flags = 0;
5943 server = cifs_pick_channel(ses);
5944
5945 rc = build_qfs_info_req(&iov, tcon, server,
5946 FS_FULL_SIZE_INFORMATION,
5947 sizeof(struct smb2_fs_full_size_info),
5948 persistent_fid, volatile_fid);
5949 if (rc)
5950 return rc;
5951
5952 if (smb3_encryption_required(tcon))
5953 flags |= CIFS_TRANSFORM_REQ;
5954
5955 memset(&rqst, 0, sizeof(struct smb_rqst));
5956 rqst.rq_iov = &iov;
5957 rqst.rq_nvec = 1;
5958
5959 if (retries)
5960 smb2_set_replay(server, &rqst);
5961
5962 rc = cifs_send_recv(xid, ses, server,
5963 &rqst, &resp_buftype, flags, &rsp_iov);
5964 free_qfs_info_req(&iov);
5965 if (rc) {
5966 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5967 goto qfsinf_exit;
5968 }
5969 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5970
5971 info = (struct smb2_fs_full_size_info *)(
5972 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5973 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5974 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5975 sizeof(struct smb2_fs_full_size_info));
5976 if (!rc)
5977 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5978
5979 qfsinf_exit:
5980 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5981
5982 if (is_replayable_error(rc) &&
5983 smb2_should_replay(tcon, &retries, &cur_sleep))
5984 goto replay_again;
5985
5986 return rc;
5987 }
5988
5989 int
5990 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5991 u64 persistent_fid, u64 volatile_fid, int level)
5992 {
5993 struct smb_rqst rqst;
5994 struct smb2_query_info_rsp *rsp = NULL;
5995 struct kvec iov;
5996 struct kvec rsp_iov;
5997 int rc = 0;
5998 int resp_buftype, max_len, min_len;
5999 struct cifs_ses *ses = tcon->ses;
6000 struct TCP_Server_Info *server;
6001 unsigned int rsp_len, offset;
6002 int flags = 0;
6003 int retries = 0, cur_sleep = 1;
6004
6005 replay_again:
6006 /* reinitialize for possible replay */
6007 flags = 0;
6008 server = cifs_pick_channel(ses);
6009
6010 if (level == FS_DEVICE_INFORMATION) {
6011 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6012 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6013 } else if (level == FS_ATTRIBUTE_INFORMATION) {
6014 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
6015 min_len = MIN_FS_ATTR_INFO_SIZE;
6016 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
6017 max_len = sizeof(struct smb3_fs_ss_info);
6018 min_len = sizeof(struct smb3_fs_ss_info);
6019 } else if (level == FS_VOLUME_INFORMATION) {
6020 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
6021 min_len = sizeof(struct smb3_fs_vol_info);
6022 } else {
6023 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
6024 return -EINVAL;
6025 }
6026
6027 rc = build_qfs_info_req(&iov, tcon, server,
6028 level, max_len,
6029 persistent_fid, volatile_fid);
6030 if (rc)
6031 return rc;
6032
6033 if (smb3_encryption_required(tcon))
6034 flags |= CIFS_TRANSFORM_REQ;
6035
6036 memset(&rqst, 0, sizeof(struct smb_rqst));
6037 rqst.rq_iov = &iov;
6038 rqst.rq_nvec = 1;
6039
6040 if (retries)
6041 smb2_set_replay(server, &rqst);
6042
6043 rc = cifs_send_recv(xid, ses, server,
6044 &rqst, &resp_buftype, flags, &rsp_iov);
6045 free_qfs_info_req(&iov);
6046 if (rc) {
6047 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6048 goto qfsattr_exit;
6049 }
6050 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6051
6052 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6053 offset = le16_to_cpu(rsp->OutputBufferOffset);
6054 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6055 if (rc)
6056 goto qfsattr_exit;
6057
6058 if (level == FS_ATTRIBUTE_INFORMATION)
6059 memcpy(&tcon->fsAttrInfo, offset
6060 + (char *)rsp, min_t(unsigned int,
6061 rsp_len, max_len));
6062 else if (level == FS_DEVICE_INFORMATION)
6063 memcpy(&tcon->fsDevInfo, offset
6064 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6065 else if (level == FS_SECTOR_SIZE_INFORMATION) {
6066 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6067 (offset + (char *)rsp);
6068 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6069 tcon->perf_sector_size =
6070 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6071 } else if (level == FS_VOLUME_INFORMATION) {
6072 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6073 (offset + (char *)rsp);
6074 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6075 tcon->vol_create_time = vol_info->VolumeCreationTime;
6076 }
6077
6078 qfsattr_exit:
6079 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6080
6081 if (is_replayable_error(rc) &&
6082 smb2_should_replay(tcon, &retries, &cur_sleep))
6083 goto replay_again;
6084
6085 return rc;
6086 }
6087
6088 int
6089 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6090 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6091 const __u32 num_lock, struct smb2_lock_element *buf)
6092 {
6093 struct smb_rqst rqst;
6094 int rc = 0;
6095 struct smb2_lock_req *req = NULL;
6096 struct kvec iov[2];
6097 struct kvec rsp_iov;
6098 int resp_buf_type;
6099 unsigned int count;
6100 int flags = CIFS_NO_RSP_BUF;
6101 unsigned int total_len;
6102 struct TCP_Server_Info *server;
6103 int retries = 0, cur_sleep = 1;
6104
6105 replay_again:
6106 /* reinitialize for possible replay */
6107 flags = CIFS_NO_RSP_BUF;
6108 server = cifs_pick_channel(tcon->ses);
6109
6110 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6111
6112 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6113 (void **) &req, &total_len);
6114 if (rc)
6115 return rc;
6116
6117 if (smb3_encryption_required(tcon))
6118 flags |= CIFS_TRANSFORM_REQ;
6119
6120 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6121 req->LockCount = cpu_to_le16(num_lock);
6122
6123 req->PersistentFileId = persist_fid;
6124 req->VolatileFileId = volatile_fid;
6125
6126 count = num_lock * sizeof(struct smb2_lock_element);
6127
6128 iov[0].iov_base = (char *)req;
6129 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6130 iov[1].iov_base = (char *)buf;
6131 iov[1].iov_len = count;
6132
6133 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6134
6135 memset(&rqst, 0, sizeof(struct smb_rqst));
6136 rqst.rq_iov = iov;
6137 rqst.rq_nvec = 2;
6138
6139 if (retries)
6140 smb2_set_replay(server, &rqst);
6141
6142 rc = cifs_send_recv(xid, tcon->ses, server,
6143 &rqst, &resp_buf_type, flags,
6144 &rsp_iov);
6145 cifs_small_buf_release(req);
6146 if (rc) {
6147 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6148 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6149 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6150 tcon->ses->Suid, rc);
6151 }
6152
6153 if (is_replayable_error(rc) &&
6154 smb2_should_replay(tcon, &retries, &cur_sleep))
6155 goto replay_again;
6156
6157 return rc;
6158 }
6159
6160 int
6161 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6162 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6163 const __u64 length, const __u64 offset, const __u32 lock_flags,
6164 const bool wait)
6165 {
6166 struct smb2_lock_element lock;
6167
6168 lock.Offset = cpu_to_le64(offset);
6169 lock.Length = cpu_to_le64(length);
6170 lock.Flags = cpu_to_le32(lock_flags);
6171 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6172 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6173
6174 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6175 }
6176
6177 int
6178 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6179 __u8 *lease_key, const __le32 lease_state)
6180 {
6181 struct smb_rqst rqst;
6182 int rc;
6183 struct smb2_lease_ack *req = NULL;
6184 struct cifs_ses *ses = tcon->ses;
6185 int flags = CIFS_OBREAK_OP;
6186 unsigned int total_len;
6187 struct kvec iov[1];
6188 struct kvec rsp_iov;
6189 int resp_buf_type;
6190 __u64 *please_key_high;
6191 __u64 *please_key_low;
6192 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6193
6194 cifs_dbg(FYI, "SMB2_lease_break\n");
6195 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6196 (void **) &req, &total_len);
6197 if (rc)
6198 return rc;
6199
6200 if (smb3_encryption_required(tcon))
6201 flags |= CIFS_TRANSFORM_REQ;
6202
6203 req->hdr.CreditRequest = cpu_to_le16(1);
6204 req->StructureSize = cpu_to_le16(36);
6205 total_len += 12;
6206
6207 memcpy(req->LeaseKey, lease_key, 16);
6208 req->LeaseState = lease_state;
6209
6210 flags |= CIFS_NO_RSP_BUF;
6211
6212 iov[0].iov_base = (char *)req;
6213 iov[0].iov_len = total_len;
6214
6215 memset(&rqst, 0, sizeof(struct smb_rqst));
6216 rqst.rq_iov = iov;
6217 rqst.rq_nvec = 1;
6218
6219 rc = cifs_send_recv(xid, ses, server,
6220 &rqst, &resp_buf_type, flags, &rsp_iov);
6221 cifs_small_buf_release(req);
6222
6223 please_key_low = (__u64 *)lease_key;
6224 please_key_high = (__u64 *)(lease_key+8);
6225 if (rc) {
6226 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6227 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6228 ses->Suid, *please_key_low, *please_key_high, rc);
6229 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6230 } else
6231 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6232 ses->Suid, *please_key_low, *please_key_high);
6233
6234 return rc;
6235 }
Kernel DRM miscellaneous fixes and cross-tree changes