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