1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 *
4 * Copyright (C) International Business Machines Corp., 2009, 2013
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * Contains the routines for constructing the SMB2 PDUs themselves
10 *
11 */
12
13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
14 /* Note that there are handle based routines which must be */
15 /* treated slightly differently for reconnection purposes since we never */
16 /* want to reuse a stale file handle and only the caller knows the file info */
17
18 #include <linux/fs.h>
19 #include <linux/kernel.h>
20 #include <linux/vfs.h>
21 #include <linux/task_io_accounting_ops.h>
22 #include <linux/uaccess.h>
23 #include <linux/uuid.h>
24 #include <linux/pagemap.h>
25 #include <linux/xattr.h>
26 #include <linux/netfs.h>
27 #include <trace/events/netfs.h>
28 #include "cifsglob.h"
29 #include "cifsacl.h"
30 #include "cifsproto.h"
31 #include "smb2proto.h"
32 #include "cifs_unicode.h"
33 #include "cifs_debug.h"
34 #include "ntlmssp.h"
35 #include "../common/smb2status.h"
36 #include "smb2glob.h"
37 #include "cifspdu.h"
38 #include "cifs_spnego.h"
39 #include "smbdirect.h"
40 #include "trace.h"
41 #ifdef CONFIG_CIFS_DFS_UPCALL
42 #include "dfs_cache.h"
43 #endif
44 #include "cached_dir.h"
45 #include "compress.h"
46 #include "fs_context.h"
47
48 /*
49 * The following table defines the expected "StructureSize" of SMB2 requests
50 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
51 *
52 * Note that commands are defined in smb2pdu.h in le16 but the array below is
53 * indexed by command in host byte order.
54 */
55 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
56 /* SMB2_NEGOTIATE */ 36,
57 /* SMB2_SESSION_SETUP */ 25,
58 /* SMB2_LOGOFF */ 4,
59 /* SMB2_TREE_CONNECT */ 9,
60 /* SMB2_TREE_DISCONNECT */ 4,
61 /* SMB2_CREATE */ 57,
62 /* SMB2_CLOSE */ 24,
63 /* SMB2_FLUSH */ 24,
64 /* SMB2_READ */ 49,
65 /* SMB2_WRITE */ 49,
66 /* SMB2_LOCK */ 48,
67 /* SMB2_IOCTL */ 57,
68 /* SMB2_CANCEL */ 4,
69 /* SMB2_ECHO */ 4,
70 /* SMB2_QUERY_DIRECTORY */ 33,
71 /* SMB2_CHANGE_NOTIFY */ 32,
72 /* SMB2_QUERY_INFO */ 41,
73 /* SMB2_SET_INFO */ 33,
74 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
75 };
76
smb3_encryption_required(const struct cifs_tcon * tcon)77 int smb3_encryption_required(const struct cifs_tcon *tcon)
78 {
79 if (!tcon || !tcon->ses)
80 return 0;
81 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
82 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
83 return 1;
84 if (tcon->seal &&
85 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
86 return 1;
87 if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
88 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
89 return 1;
90 return 0;
91 }
92
93 static void
smb2_hdr_assemble(struct smb2_hdr * shdr,__le16 smb2_cmd,const struct cifs_tcon * tcon,struct TCP_Server_Info * server)94 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
95 const struct cifs_tcon *tcon,
96 struct TCP_Server_Info *server)
97 {
98 struct smb3_hdr_req *smb3_hdr;
99
100 shdr->ProtocolId = SMB2_PROTO_NUMBER;
101 shdr->StructureSize = cpu_to_le16(64);
102 shdr->Command = smb2_cmd;
103
104 if (server) {
105 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
106 if (server->dialect >= SMB30_PROT_ID) {
107 smb3_hdr = (struct smb3_hdr_req *)shdr;
108 /*
109 * if primary channel is not set yet, use default
110 * channel for chan sequence num
111 */
112 if (SERVER_IS_CHAN(server))
113 smb3_hdr->ChannelSequence =
114 cpu_to_le16(server->primary_server->channel_sequence_num);
115 else
116 smb3_hdr->ChannelSequence =
117 cpu_to_le16(server->channel_sequence_num);
118 }
119 spin_lock(&server->req_lock);
120 /* Request up to 10 credits but don't go over the limit. */
121 if (server->credits >= server->max_credits)
122 shdr->CreditRequest = cpu_to_le16(0);
123 else
124 shdr->CreditRequest = cpu_to_le16(
125 min_t(int, server->max_credits -
126 server->credits, 10));
127 spin_unlock(&server->req_lock);
128 } else {
129 shdr->CreditRequest = cpu_to_le16(2);
130 }
131 shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
132
133 if (!tcon)
134 goto out;
135
136 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
137 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
138 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
139 shdr->CreditCharge = cpu_to_le16(1);
140 /* else CreditCharge MBZ */
141
142 shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
143 /* Uid is not converted */
144 if (tcon->ses)
145 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
146
147 /*
148 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
149 * to pass the path on the Open SMB prefixed by \\server\share.
150 * Not sure when we would need to do the augmented path (if ever) and
151 * setting this flag breaks the SMB2 open operation since it is
152 * illegal to send an empty path name (without \\server\share prefix)
153 * when the DFS flag is set in the SMB open header. We could
154 * consider setting the flag on all operations other than open
155 * but it is safer to net set it for now.
156 */
157 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
158 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
159
160 if (server && server->sign && !smb3_encryption_required(tcon))
161 shdr->Flags |= SMB2_FLAGS_SIGNED;
162 out:
163 return;
164 }
165
166 /* helper function for code reuse */
167 static int
cifs_chan_skip_or_disable(struct cifs_ses * ses,struct TCP_Server_Info * server,bool from_reconnect)168 cifs_chan_skip_or_disable(struct cifs_ses *ses,
169 struct TCP_Server_Info *server,
170 bool from_reconnect)
171 {
172 struct TCP_Server_Info *pserver;
173 unsigned int chan_index;
174
175 if (SERVER_IS_CHAN(server)) {
176 cifs_dbg(VFS,
177 "server %s does not support multichannel anymore. Skip secondary channel\n",
178 ses->server->hostname);
179
180 spin_lock(&ses->chan_lock);
181 chan_index = cifs_ses_get_chan_index(ses, server);
182 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
183 spin_unlock(&ses->chan_lock);
184 goto skip_terminate;
185 }
186
187 ses->chans[chan_index].server = NULL;
188 server->terminate = true;
189 spin_unlock(&ses->chan_lock);
190
191 /*
192 * the above reference of server by channel
193 * needs to be dropped without holding chan_lock
194 * as cifs_put_tcp_session takes a higher lock
195 * i.e. cifs_tcp_ses_lock
196 */
197 cifs_put_tcp_session(server, from_reconnect);
198
199 cifs_signal_cifsd_for_reconnect(server, false);
200
201 /* mark primary server as needing reconnect */
202 pserver = server->primary_server;
203 cifs_signal_cifsd_for_reconnect(pserver, false);
204 skip_terminate:
205 return -EHOSTDOWN;
206 }
207
208 cifs_server_dbg(VFS,
209 "server does not support multichannel anymore. Disable all other channels\n");
210 cifs_disable_secondary_channels(ses);
211
212
213 return 0;
214 }
215
216 static int
smb2_reconnect(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,bool from_reconnect)217 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
218 struct TCP_Server_Info *server, bool from_reconnect)
219 {
220 struct cifs_ses *ses;
221 int xid;
222 int rc = 0;
223
224 /*
225 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
226 * check for tcp and smb session status done differently
227 * for those three - in the calling routine.
228 */
229 if (tcon == NULL)
230 return 0;
231
232 if (smb2_command == SMB2_TREE_CONNECT)
233 return 0;
234
235 spin_lock(&tcon->tc_lock);
236 if (tcon->status == TID_EXITING) {
237 /*
238 * only tree disconnect allowed when disconnecting ...
239 */
240 if (smb2_command != SMB2_TREE_DISCONNECT) {
241 spin_unlock(&tcon->tc_lock);
242 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
243 smb2_command);
244 return -ENODEV;
245 }
246 }
247 spin_unlock(&tcon->tc_lock);
248
249 ses = tcon->ses;
250 if (!ses)
251 return -EIO;
252 spin_lock(&ses->ses_lock);
253 if (ses->ses_status == SES_EXITING) {
254 spin_unlock(&ses->ses_lock);
255 return -EIO;
256 }
257 spin_unlock(&ses->ses_lock);
258 if (!ses->server || !server)
259 return -EIO;
260
261 spin_lock(&server->srv_lock);
262 if (server->tcpStatus == CifsNeedReconnect) {
263 /*
264 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
265 * here since they are implicitly done when session drops.
266 */
267 switch (smb2_command) {
268 /*
269 * BB Should we keep oplock break and add flush to exceptions?
270 */
271 case SMB2_TREE_DISCONNECT:
272 case SMB2_CANCEL:
273 case SMB2_CLOSE:
274 case SMB2_OPLOCK_BREAK:
275 spin_unlock(&server->srv_lock);
276 return -EAGAIN;
277 }
278 }
279
280 /* if server is marked for termination, cifsd will cleanup */
281 if (server->terminate) {
282 spin_unlock(&server->srv_lock);
283 return -EHOSTDOWN;
284 }
285 spin_unlock(&server->srv_lock);
286
287 again:
288 rc = cifs_wait_for_server_reconnect(server, tcon->retry);
289 if (rc)
290 return rc;
291
292 spin_lock(&ses->chan_lock);
293 if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
294 spin_unlock(&ses->chan_lock);
295 return 0;
296 }
297 spin_unlock(&ses->chan_lock);
298 cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
299 tcon->ses->chans_need_reconnect,
300 tcon->need_reconnect);
301
302 mutex_lock(&ses->session_mutex);
303 /*
304 * Handle the case where a concurrent thread failed to negotiate or
305 * killed a channel.
306 */
307 spin_lock(&server->srv_lock);
308 switch (server->tcpStatus) {
309 case CifsExiting:
310 spin_unlock(&server->srv_lock);
311 mutex_unlock(&ses->session_mutex);
312 return -EHOSTDOWN;
313 case CifsNeedReconnect:
314 spin_unlock(&server->srv_lock);
315 mutex_unlock(&ses->session_mutex);
316 if (!tcon->retry)
317 return -EHOSTDOWN;
318 goto again;
319 default:
320 break;
321 }
322 spin_unlock(&server->srv_lock);
323
324 /*
325 * need to prevent multiple threads trying to simultaneously
326 * reconnect the same SMB session
327 */
328 spin_lock(&ses->ses_lock);
329 spin_lock(&ses->chan_lock);
330 if (!cifs_chan_needs_reconnect(ses, server) &&
331 ses->ses_status == SES_GOOD) {
332 spin_unlock(&ses->chan_lock);
333 spin_unlock(&ses->ses_lock);
334 /* this means that we only need to tree connect */
335 if (tcon->need_reconnect)
336 goto skip_sess_setup;
337
338 mutex_unlock(&ses->session_mutex);
339 goto out;
340 }
341 spin_unlock(&ses->chan_lock);
342 spin_unlock(&ses->ses_lock);
343
344 rc = cifs_negotiate_protocol(0, ses, server);
345 if (rc) {
346 mutex_unlock(&ses->session_mutex);
347 if (!tcon->retry)
348 return -EHOSTDOWN;
349 goto again;
350 }
351 /*
352 * if server stopped supporting multichannel
353 * and the first channel reconnected, disable all the others.
354 */
355 if (ses->chan_count > 1 &&
356 !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
357 rc = cifs_chan_skip_or_disable(ses, server,
358 from_reconnect);
359 if (rc) {
360 mutex_unlock(&ses->session_mutex);
361 goto out;
362 }
363 }
364
365 rc = cifs_setup_session(0, ses, server, ses->local_nls);
366 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
367 /*
368 * Try alternate password for next reconnect (key rotation
369 * could be enabled on the server e.g.) if an alternate
370 * password is available and the current password is expired,
371 * but do not swap on non pwd related errors like host down
372 */
373 if (ses->password2)
374 swap(ses->password2, ses->password);
375 }
376 if (rc) {
377 mutex_unlock(&ses->session_mutex);
378 if (rc == -EACCES && !tcon->retry)
379 return -EHOSTDOWN;
380 goto out;
381 }
382
383 skip_sess_setup:
384 if (!tcon->need_reconnect) {
385 mutex_unlock(&ses->session_mutex);
386 goto out;
387 }
388 cifs_mark_open_files_invalid(tcon);
389 if (tcon->use_persistent)
390 tcon->need_reopen_files = true;
391
392 rc = cifs_tree_connect(0, tcon);
393
394 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
395 if (rc) {
396 /* If sess reconnected but tcon didn't, something strange ... */
397 mutex_unlock(&ses->session_mutex);
398 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
399 goto out;
400 }
401
402 spin_lock(&ses->ses_lock);
403 if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
404 spin_unlock(&ses->ses_lock);
405 mutex_unlock(&ses->session_mutex);
406 goto skip_add_channels;
407 }
408 ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
409 spin_unlock(&ses->ses_lock);
410
411 if (!rc &&
412 (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
413 server->ops->query_server_interfaces) {
414 mutex_unlock(&ses->session_mutex);
415
416 /*
417 * query server network interfaces, in case they change
418 */
419 xid = get_xid();
420 rc = server->ops->query_server_interfaces(xid, tcon, false);
421 free_xid(xid);
422
423 if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
424 /*
425 * some servers like Azure SMB server do not advertise
426 * that multichannel has been disabled with server
427 * capabilities, rather return STATUS_NOT_IMPLEMENTED.
428 * treat this as server not supporting multichannel
429 */
430
431 rc = cifs_chan_skip_or_disable(ses, server,
432 from_reconnect);
433 goto skip_add_channels;
434 } else if (rc)
435 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
436 __func__, rc);
437
438 if (ses->chan_max > ses->chan_count &&
439 ses->iface_count &&
440 !SERVER_IS_CHAN(server)) {
441 if (ses->chan_count == 1) {
442 cifs_server_dbg(VFS, "supports multichannel now\n");
443 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
444 (SMB_INTERFACE_POLL_INTERVAL * HZ));
445 }
446
447 cifs_try_adding_channels(ses);
448 }
449 } else {
450 mutex_unlock(&ses->session_mutex);
451 }
452
453 skip_add_channels:
454 spin_lock(&ses->ses_lock);
455 ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
456 spin_unlock(&ses->ses_lock);
457
458 if (smb2_command != SMB2_INTERNAL_CMD)
459 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
460
461 atomic_inc(&tconInfoReconnectCount);
462 out:
463 /*
464 * Check if handle based operation so we know whether we can continue
465 * or not without returning to caller to reset file handle.
466 */
467 /*
468 * BB Is flush done by server on drop of tcp session? Should we special
469 * case it and skip above?
470 */
471 switch (smb2_command) {
472 case SMB2_FLUSH:
473 case SMB2_READ:
474 case SMB2_WRITE:
475 case SMB2_LOCK:
476 case SMB2_QUERY_DIRECTORY:
477 case SMB2_CHANGE_NOTIFY:
478 case SMB2_QUERY_INFO:
479 case SMB2_SET_INFO:
480 case SMB2_IOCTL:
481 rc = -EAGAIN;
482 }
483 return rc;
484 }
485
486 static void
fill_small_buf(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void * buf,unsigned int * total_len)487 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
488 struct TCP_Server_Info *server,
489 void *buf,
490 unsigned int *total_len)
491 {
492 struct smb2_pdu *spdu = buf;
493 /* lookup word count ie StructureSize from table */
494 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
495
496 /*
497 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
498 * largest operations (Create)
499 */
500 memset(buf, 0, 256);
501
502 smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
503 spdu->StructureSize2 = cpu_to_le16(parmsize);
504
505 *total_len = parmsize + sizeof(struct smb2_hdr);
506 }
507
508 /*
509 * Allocate and return pointer to an SMB request hdr, and set basic
510 * SMB information in the SMB header. If the return code is zero, this
511 * function must have filled in request_buf pointer.
512 */
__smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)513 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
514 struct TCP_Server_Info *server,
515 void **request_buf, unsigned int *total_len)
516 {
517 /* BB eventually switch this to SMB2 specific small buf size */
518 switch (smb2_command) {
519 case SMB2_SET_INFO:
520 case SMB2_QUERY_INFO:
521 *request_buf = cifs_buf_get();
522 break;
523 default:
524 *request_buf = cifs_small_buf_get();
525 break;
526 }
527 if (*request_buf == NULL) {
528 /* BB should we add a retry in here if not a writepage? */
529 return -ENOMEM;
530 }
531
532 fill_small_buf(smb2_command, tcon, server,
533 (struct smb2_hdr *)(*request_buf),
534 total_len);
535
536 if (tcon != NULL) {
537 uint16_t com_code = le16_to_cpu(smb2_command);
538 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
539 cifs_stats_inc(&tcon->num_smbs_sent);
540 }
541
542 return 0;
543 }
544
smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)545 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
546 struct TCP_Server_Info *server,
547 void **request_buf, unsigned int *total_len)
548 {
549 int rc;
550
551 rc = smb2_reconnect(smb2_command, tcon, server, false);
552 if (rc)
553 return rc;
554
555 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
556 total_len);
557 }
558
smb2_ioctl_req_init(u32 opcode,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)559 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
560 struct TCP_Server_Info *server,
561 void **request_buf, unsigned int *total_len)
562 {
563 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
564 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
565 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
566 request_buf, total_len);
567 }
568 return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
569 request_buf, total_len);
570 }
571
572 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
573
574 static void
build_preauth_ctxt(struct smb2_preauth_neg_context * pneg_ctxt)575 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
576 {
577 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
578 pneg_ctxt->DataLength = cpu_to_le16(38);
579 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
580 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
581 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
582 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
583 }
584
585 static void
build_compression_ctxt(struct smb2_compression_capabilities_context * pneg_ctxt)586 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
587 {
588 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
589 pneg_ctxt->DataLength =
590 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
591 - sizeof(struct smb2_neg_context));
592 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
593 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
594 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
595 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
596 }
597
598 static unsigned int
build_signing_ctxt(struct smb2_signing_capabilities * pneg_ctxt)599 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
600 {
601 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
602 unsigned short num_algs = 1; /* number of signing algorithms sent */
603
604 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
605 /*
606 * Context Data length must be rounded to multiple of 8 for some servers
607 */
608 pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
609 sizeof(struct smb2_neg_context) +
610 (num_algs * sizeof(u16)), 8));
611 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
612 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
613
614 ctxt_len += sizeof(__le16) * num_algs;
615 ctxt_len = ALIGN(ctxt_len, 8);
616 return ctxt_len;
617 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
618 }
619
620 static void
build_encrypt_ctxt(struct smb2_encryption_neg_context * pneg_ctxt)621 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
622 {
623 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
624 if (require_gcm_256) {
625 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
626 pneg_ctxt->CipherCount = cpu_to_le16(1);
627 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
628 } else if (enable_gcm_256) {
629 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
630 pneg_ctxt->CipherCount = cpu_to_le16(3);
631 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
632 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
633 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
634 } else {
635 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
636 pneg_ctxt->CipherCount = cpu_to_le16(2);
637 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
638 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
639 }
640 }
641
642 static unsigned int
build_netname_ctxt(struct smb2_netname_neg_context * pneg_ctxt,char * hostname)643 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
644 {
645 struct nls_table *cp = load_nls_default();
646
647 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
648
649 /* copy up to max of first 100 bytes of server name to NetName field */
650 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
651 /* context size is DataLength + minimal smb2_neg_context */
652 return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
653 }
654
655 static void
build_posix_ctxt(struct smb2_posix_neg_context * pneg_ctxt)656 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
657 {
658 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
659 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
660 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
661 pneg_ctxt->Name[0] = 0x93;
662 pneg_ctxt->Name[1] = 0xAD;
663 pneg_ctxt->Name[2] = 0x25;
664 pneg_ctxt->Name[3] = 0x50;
665 pneg_ctxt->Name[4] = 0x9C;
666 pneg_ctxt->Name[5] = 0xB4;
667 pneg_ctxt->Name[6] = 0x11;
668 pneg_ctxt->Name[7] = 0xE7;
669 pneg_ctxt->Name[8] = 0xB4;
670 pneg_ctxt->Name[9] = 0x23;
671 pneg_ctxt->Name[10] = 0x83;
672 pneg_ctxt->Name[11] = 0xDE;
673 pneg_ctxt->Name[12] = 0x96;
674 pneg_ctxt->Name[13] = 0x8B;
675 pneg_ctxt->Name[14] = 0xCD;
676 pneg_ctxt->Name[15] = 0x7C;
677 }
678
679 static void
assemble_neg_contexts(struct smb2_negotiate_req * req,struct TCP_Server_Info * server,unsigned int * total_len)680 assemble_neg_contexts(struct smb2_negotiate_req *req,
681 struct TCP_Server_Info *server, unsigned int *total_len)
682 {
683 unsigned int ctxt_len, neg_context_count;
684 struct TCP_Server_Info *pserver;
685 char *pneg_ctxt;
686 char *hostname;
687
688 if (*total_len > 200) {
689 /* In case length corrupted don't want to overrun smb buffer */
690 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
691 return;
692 }
693
694 /*
695 * round up total_len of fixed part of SMB3 negotiate request to 8
696 * byte boundary before adding negotiate contexts
697 */
698 *total_len = ALIGN(*total_len, 8);
699
700 pneg_ctxt = (*total_len) + (char *)req;
701 req->NegotiateContextOffset = cpu_to_le32(*total_len);
702
703 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
704 ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
705 *total_len += ctxt_len;
706 pneg_ctxt += ctxt_len;
707
708 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
709 ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
710 *total_len += ctxt_len;
711 pneg_ctxt += ctxt_len;
712
713 /*
714 * secondary channels don't have the hostname field populated
715 * use the hostname field in the primary channel instead
716 */
717 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
718 cifs_server_lock(pserver);
719 hostname = pserver->hostname;
720 if (hostname && (hostname[0] != 0)) {
721 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
722 hostname);
723 *total_len += ctxt_len;
724 pneg_ctxt += ctxt_len;
725 neg_context_count = 3;
726 } else
727 neg_context_count = 2;
728 cifs_server_unlock(pserver);
729
730 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
731 *total_len += sizeof(struct smb2_posix_neg_context);
732 pneg_ctxt += sizeof(struct smb2_posix_neg_context);
733 neg_context_count++;
734
735 if (server->compression.requested) {
736 build_compression_ctxt((struct smb2_compression_capabilities_context *)
737 pneg_ctxt);
738 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
739 *total_len += ctxt_len;
740 pneg_ctxt += ctxt_len;
741 neg_context_count++;
742 }
743
744 if (enable_negotiate_signing) {
745 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
746 pneg_ctxt);
747 *total_len += ctxt_len;
748 pneg_ctxt += ctxt_len;
749 neg_context_count++;
750 }
751
752 /* check for and add transport_capabilities and signing capabilities */
753 req->NegotiateContextCount = cpu_to_le16(neg_context_count);
754
755 }
756
757 /* If invalid preauth context warn but use what we requested, SHA-512 */
decode_preauth_context(struct smb2_preauth_neg_context * ctxt)758 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
759 {
760 unsigned int len = le16_to_cpu(ctxt->DataLength);
761
762 /*
763 * Caller checked that DataLength remains within SMB boundary. We still
764 * need to confirm that one HashAlgorithms member is accounted for.
765 */
766 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
767 pr_warn_once("server sent bad preauth context\n");
768 return;
769 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
770 pr_warn_once("server sent invalid SaltLength\n");
771 return;
772 }
773 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
774 pr_warn_once("Invalid SMB3 hash algorithm count\n");
775 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
776 pr_warn_once("unknown SMB3 hash algorithm\n");
777 }
778
decode_compress_ctx(struct TCP_Server_Info * server,struct smb2_compression_capabilities_context * ctxt)779 static void decode_compress_ctx(struct TCP_Server_Info *server,
780 struct smb2_compression_capabilities_context *ctxt)
781 {
782 unsigned int len = le16_to_cpu(ctxt->DataLength);
783 __le16 alg;
784
785 server->compression.enabled = false;
786
787 /*
788 * Caller checked that DataLength remains within SMB boundary. We still
789 * need to confirm that one CompressionAlgorithms member is accounted
790 * for.
791 */
792 if (len < 10) {
793 pr_warn_once("server sent bad compression cntxt\n");
794 return;
795 }
796
797 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
798 pr_warn_once("invalid SMB3 compress algorithm count\n");
799 return;
800 }
801
802 alg = ctxt->CompressionAlgorithms[0];
803
804 /* 'NONE' (0) compressor type is never negotiated */
805 if (alg == 0 || le16_to_cpu(alg) > 3) {
806 pr_warn_once("invalid compression algorithm '%u'\n", alg);
807 return;
808 }
809
810 server->compression.alg = alg;
811 server->compression.enabled = true;
812 }
813
decode_encrypt_ctx(struct TCP_Server_Info * server,struct smb2_encryption_neg_context * ctxt)814 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
815 struct smb2_encryption_neg_context *ctxt)
816 {
817 unsigned int len = le16_to_cpu(ctxt->DataLength);
818
819 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
820 /*
821 * Caller checked that DataLength remains within SMB boundary. We still
822 * need to confirm that one Cipher flexible array member is accounted
823 * for.
824 */
825 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
826 pr_warn_once("server sent bad crypto ctxt len\n");
827 return -EINVAL;
828 }
829
830 if (le16_to_cpu(ctxt->CipherCount) != 1) {
831 pr_warn_once("Invalid SMB3.11 cipher count\n");
832 return -EINVAL;
833 }
834 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
835 if (require_gcm_256) {
836 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
837 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
838 return -EOPNOTSUPP;
839 }
840 } else if (ctxt->Ciphers[0] == 0) {
841 /*
842 * e.g. if server only supported AES256_CCM (very unlikely)
843 * or server supported no encryption types or had all disabled.
844 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
845 * in which mount requested encryption ("seal") checks later
846 * on during tree connection will return proper rc, but if
847 * seal not requested by client, since server is allowed to
848 * return 0 to indicate no supported cipher, we can't fail here
849 */
850 server->cipher_type = 0;
851 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
852 pr_warn_once("Server does not support requested encryption types\n");
853 return 0;
854 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
855 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
856 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
857 /* server returned a cipher we didn't ask for */
858 pr_warn_once("Invalid SMB3.11 cipher returned\n");
859 return -EINVAL;
860 }
861 server->cipher_type = ctxt->Ciphers[0];
862 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
863 return 0;
864 }
865
decode_signing_ctx(struct TCP_Server_Info * server,struct smb2_signing_capabilities * pctxt)866 static void decode_signing_ctx(struct TCP_Server_Info *server,
867 struct smb2_signing_capabilities *pctxt)
868 {
869 unsigned int len = le16_to_cpu(pctxt->DataLength);
870
871 /*
872 * Caller checked that DataLength remains within SMB boundary. We still
873 * need to confirm that one SigningAlgorithms flexible array member is
874 * accounted for.
875 */
876 if ((len < 4) || (len > 16)) {
877 pr_warn_once("server sent bad signing negcontext\n");
878 return;
879 }
880 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
881 pr_warn_once("Invalid signing algorithm count\n");
882 return;
883 }
884 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
885 pr_warn_once("unknown signing algorithm\n");
886 return;
887 }
888
889 server->signing_negotiated = true;
890 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
891 cifs_dbg(FYI, "signing algorithm %d chosen\n",
892 server->signing_algorithm);
893 }
894
895
smb311_decode_neg_context(struct smb2_negotiate_rsp * rsp,struct TCP_Server_Info * server,unsigned int len_of_smb)896 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
897 struct TCP_Server_Info *server,
898 unsigned int len_of_smb)
899 {
900 struct smb2_neg_context *pctx;
901 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
902 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
903 unsigned int len_of_ctxts, i;
904 int rc = 0;
905
906 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
907 if (len_of_smb <= offset) {
908 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
909 return -EINVAL;
910 }
911
912 len_of_ctxts = len_of_smb - offset;
913
914 for (i = 0; i < ctxt_cnt; i++) {
915 int clen;
916 /* check that offset is not beyond end of SMB */
917 if (len_of_ctxts < sizeof(struct smb2_neg_context))
918 break;
919
920 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
921 clen = sizeof(struct smb2_neg_context)
922 + le16_to_cpu(pctx->DataLength);
923 /*
924 * 2.2.4 SMB2 NEGOTIATE Response
925 * Subsequent negotiate contexts MUST appear at the first 8-byte
926 * aligned offset following the previous negotiate context.
927 */
928 if (i + 1 != ctxt_cnt)
929 clen = ALIGN(clen, 8);
930 if (clen > len_of_ctxts)
931 break;
932
933 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
934 decode_preauth_context(
935 (struct smb2_preauth_neg_context *)pctx);
936 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
937 rc = decode_encrypt_ctx(server,
938 (struct smb2_encryption_neg_context *)pctx);
939 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
940 decode_compress_ctx(server,
941 (struct smb2_compression_capabilities_context *)pctx);
942 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
943 server->posix_ext_supported = true;
944 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
945 decode_signing_ctx(server,
946 (struct smb2_signing_capabilities *)pctx);
947 else
948 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
949 le16_to_cpu(pctx->ContextType));
950 if (rc)
951 break;
952
953 offset += clen;
954 len_of_ctxts -= clen;
955 }
956 return rc;
957 }
958
959 static struct create_posix *
create_posix_buf(umode_t mode)960 create_posix_buf(umode_t mode)
961 {
962 struct create_posix *buf;
963
964 buf = kzalloc(sizeof(struct create_posix),
965 GFP_KERNEL);
966 if (!buf)
967 return NULL;
968
969 buf->ccontext.DataOffset =
970 cpu_to_le16(offsetof(struct create_posix, Mode));
971 buf->ccontext.DataLength = cpu_to_le32(4);
972 buf->ccontext.NameOffset =
973 cpu_to_le16(offsetof(struct create_posix, Name));
974 buf->ccontext.NameLength = cpu_to_le16(16);
975
976 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
977 buf->Name[0] = 0x93;
978 buf->Name[1] = 0xAD;
979 buf->Name[2] = 0x25;
980 buf->Name[3] = 0x50;
981 buf->Name[4] = 0x9C;
982 buf->Name[5] = 0xB4;
983 buf->Name[6] = 0x11;
984 buf->Name[7] = 0xE7;
985 buf->Name[8] = 0xB4;
986 buf->Name[9] = 0x23;
987 buf->Name[10] = 0x83;
988 buf->Name[11] = 0xDE;
989 buf->Name[12] = 0x96;
990 buf->Name[13] = 0x8B;
991 buf->Name[14] = 0xCD;
992 buf->Name[15] = 0x7C;
993 buf->Mode = cpu_to_le32(mode);
994 cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
995 return buf;
996 }
997
998 static int
add_posix_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode)999 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1000 {
1001 unsigned int num = *num_iovec;
1002
1003 iov[num].iov_base = create_posix_buf(mode);
1004 if (mode == ACL_NO_MODE)
1005 cifs_dbg(FYI, "%s: no mode\n", __func__);
1006 if (iov[num].iov_base == NULL)
1007 return -ENOMEM;
1008 iov[num].iov_len = sizeof(struct create_posix);
1009 *num_iovec = num + 1;
1010 return 0;
1011 }
1012
1013
1014 /*
1015 *
1016 * SMB2 Worker functions follow:
1017 *
1018 * The general structure of the worker functions is:
1019 * 1) Call smb2_init (assembles SMB2 header)
1020 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
1021 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
1022 * 4) Decode SMB2 command specific fields in the fixed length area
1023 * 5) Decode variable length data area (if any for this SMB2 command type)
1024 * 6) Call free smb buffer
1025 * 7) return
1026 *
1027 */
1028
1029 int
SMB2_negotiate(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server)1030 SMB2_negotiate(const unsigned int xid,
1031 struct cifs_ses *ses,
1032 struct TCP_Server_Info *server)
1033 {
1034 struct smb_rqst rqst;
1035 struct smb2_negotiate_req *req;
1036 struct smb2_negotiate_rsp *rsp;
1037 struct kvec iov[1];
1038 struct kvec rsp_iov;
1039 int rc;
1040 int resp_buftype;
1041 int blob_offset, blob_length;
1042 char *security_blob;
1043 int flags = CIFS_NEG_OP;
1044 unsigned int total_len;
1045
1046 cifs_dbg(FYI, "Negotiate protocol\n");
1047
1048 if (!server) {
1049 WARN(1, "%s: server is NULL!\n", __func__);
1050 return -EIO;
1051 }
1052
1053 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1054 (void **) &req, &total_len);
1055 if (rc)
1056 return rc;
1057
1058 req->hdr.SessionId = 0;
1059
1060 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1061 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1062
1063 if (strcmp(server->vals->version_string,
1064 SMB3ANY_VERSION_STRING) == 0) {
1065 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1066 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1067 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1068 req->DialectCount = cpu_to_le16(3);
1069 total_len += 6;
1070 } else if (strcmp(server->vals->version_string,
1071 SMBDEFAULT_VERSION_STRING) == 0) {
1072 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1073 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1074 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1075 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1076 req->DialectCount = cpu_to_le16(4);
1077 total_len += 8;
1078 } else {
1079 /* otherwise send specific dialect */
1080 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1081 req->DialectCount = cpu_to_le16(1);
1082 total_len += 2;
1083 }
1084
1085 /* only one of SMB2 signing flags may be set in SMB2 request */
1086 if (ses->sign)
1087 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1088 else if (global_secflags & CIFSSEC_MAY_SIGN)
1089 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1090 else
1091 req->SecurityMode = 0;
1092
1093 req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1094 if (ses->chan_max > 1)
1095 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1096
1097 /* ClientGUID must be zero for SMB2.02 dialect */
1098 if (server->vals->protocol_id == SMB20_PROT_ID)
1099 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1100 else {
1101 memcpy(req->ClientGUID, server->client_guid,
1102 SMB2_CLIENT_GUID_SIZE);
1103 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1104 (strcmp(server->vals->version_string,
1105 SMB3ANY_VERSION_STRING) == 0) ||
1106 (strcmp(server->vals->version_string,
1107 SMBDEFAULT_VERSION_STRING) == 0))
1108 assemble_neg_contexts(req, server, &total_len);
1109 }
1110 iov[0].iov_base = (char *)req;
1111 iov[0].iov_len = total_len;
1112
1113 memset(&rqst, 0, sizeof(struct smb_rqst));
1114 rqst.rq_iov = iov;
1115 rqst.rq_nvec = 1;
1116
1117 rc = cifs_send_recv(xid, ses, server,
1118 &rqst, &resp_buftype, flags, &rsp_iov);
1119 cifs_small_buf_release(req);
1120 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1121 /*
1122 * No tcon so can't do
1123 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1124 */
1125 if (rc == -EOPNOTSUPP) {
1126 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");
1127 goto neg_exit;
1128 } else if (rc != 0)
1129 goto neg_exit;
1130
1131 rc = -EIO;
1132 if (strcmp(server->vals->version_string,
1133 SMB3ANY_VERSION_STRING) == 0) {
1134 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1135 cifs_server_dbg(VFS,
1136 "SMB2 dialect returned but not requested\n");
1137 goto neg_exit;
1138 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1139 cifs_server_dbg(VFS,
1140 "SMB2.1 dialect returned but not requested\n");
1141 goto neg_exit;
1142 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1143 /* ops set to 3.0 by default for default so update */
1144 server->ops = &smb311_operations;
1145 server->vals = &smb311_values;
1146 }
1147 } else if (strcmp(server->vals->version_string,
1148 SMBDEFAULT_VERSION_STRING) == 0) {
1149 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1150 cifs_server_dbg(VFS,
1151 "SMB2 dialect returned but not requested\n");
1152 goto neg_exit;
1153 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1154 /* ops set to 3.0 by default for default so update */
1155 server->ops = &smb21_operations;
1156 server->vals = &smb21_values;
1157 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1158 server->ops = &smb311_operations;
1159 server->vals = &smb311_values;
1160 }
1161 } else if (le16_to_cpu(rsp->DialectRevision) !=
1162 server->vals->protocol_id) {
1163 /* if requested single dialect ensure returned dialect matched */
1164 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1165 le16_to_cpu(rsp->DialectRevision));
1166 goto neg_exit;
1167 }
1168
1169 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1170
1171 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1172 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1173 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1174 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1175 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1176 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1177 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1178 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1179 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1180 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1181 else {
1182 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1183 le16_to_cpu(rsp->DialectRevision));
1184 goto neg_exit;
1185 }
1186
1187 rc = 0;
1188 server->dialect = le16_to_cpu(rsp->DialectRevision);
1189
1190 /*
1191 * Keep a copy of the hash after negprot. This hash will be
1192 * the starting hash value for all sessions made from this
1193 * server.
1194 */
1195 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1196 SMB2_PREAUTH_HASH_SIZE);
1197
1198 /* SMB2 only has an extended negflavor */
1199 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1200 /* set it to the maximum buffer size value we can send with 1 credit */
1201 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1202 SMB2_MAX_BUFFER_SIZE);
1203 server->max_read = le32_to_cpu(rsp->MaxReadSize);
1204 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1205 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1206 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1207 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1208 server->sec_mode);
1209 server->capabilities = le32_to_cpu(rsp->Capabilities);
1210 /* Internal types */
1211 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1212
1213 /*
1214 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1215 * Set the cipher type manually.
1216 */
1217 if ((server->dialect == SMB30_PROT_ID ||
1218 server->dialect == SMB302_PROT_ID) &&
1219 (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1220 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1221
1222 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1223 (struct smb2_hdr *)rsp);
1224 /*
1225 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1226 * for us will be
1227 * ses->sectype = RawNTLMSSP;
1228 * but for time being this is our only auth choice so doesn't matter.
1229 * We just found a server which sets blob length to zero expecting raw.
1230 */
1231 if (blob_length == 0) {
1232 cifs_dbg(FYI, "missing security blob on negprot\n");
1233 server->sec_ntlmssp = true;
1234 }
1235
1236 rc = cifs_enable_signing(server, ses->sign);
1237 if (rc)
1238 goto neg_exit;
1239 if (blob_length) {
1240 rc = decode_negTokenInit(security_blob, blob_length, server);
1241 if (rc == 1)
1242 rc = 0;
1243 else if (rc == 0)
1244 rc = -EIO;
1245 }
1246
1247 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1248 if (rsp->NegotiateContextCount)
1249 rc = smb311_decode_neg_context(rsp, server,
1250 rsp_iov.iov_len);
1251 else
1252 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1253 }
1254
1255 if (server->cipher_type && !rc)
1256 rc = smb3_crypto_aead_allocate(server);
1257 neg_exit:
1258 free_rsp_buf(resp_buftype, rsp);
1259 return rc;
1260 }
1261
smb3_validate_negotiate(const unsigned int xid,struct cifs_tcon * tcon)1262 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1263 {
1264 int rc;
1265 struct validate_negotiate_info_req *pneg_inbuf;
1266 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1267 u32 rsplen;
1268 u32 inbuflen; /* max of 4 dialects */
1269 struct TCP_Server_Info *server = tcon->ses->server;
1270
1271 cifs_dbg(FYI, "validate negotiate\n");
1272
1273 /* In SMB3.11 preauth integrity supersedes validate negotiate */
1274 if (server->dialect == SMB311_PROT_ID)
1275 return 0;
1276
1277 /*
1278 * validation ioctl must be signed, so no point sending this if we
1279 * can not sign it (ie are not known user). Even if signing is not
1280 * required (enabled but not negotiated), in those cases we selectively
1281 * sign just this, the first and only signed request on a connection.
1282 * Having validation of negotiate info helps reduce attack vectors.
1283 */
1284 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1285 return 0; /* validation requires signing */
1286
1287 if (tcon->ses->user_name == NULL) {
1288 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1289 return 0; /* validation requires signing */
1290 }
1291
1292 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1293 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1294
1295 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1296 if (!pneg_inbuf)
1297 return -ENOMEM;
1298
1299 pneg_inbuf->Capabilities =
1300 cpu_to_le32(server->vals->req_capabilities);
1301 if (tcon->ses->chan_max > 1)
1302 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1303
1304 memcpy(pneg_inbuf->Guid, server->client_guid,
1305 SMB2_CLIENT_GUID_SIZE);
1306
1307 if (tcon->ses->sign)
1308 pneg_inbuf->SecurityMode =
1309 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1310 else if (global_secflags & CIFSSEC_MAY_SIGN)
1311 pneg_inbuf->SecurityMode =
1312 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1313 else
1314 pneg_inbuf->SecurityMode = 0;
1315
1316
1317 if (strcmp(server->vals->version_string,
1318 SMB3ANY_VERSION_STRING) == 0) {
1319 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1320 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1321 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1322 pneg_inbuf->DialectCount = cpu_to_le16(3);
1323 /* SMB 2.1 not included so subtract one dialect from len */
1324 inbuflen = sizeof(*pneg_inbuf) -
1325 (sizeof(pneg_inbuf->Dialects[0]));
1326 } else if (strcmp(server->vals->version_string,
1327 SMBDEFAULT_VERSION_STRING) == 0) {
1328 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1329 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1330 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1331 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1332 pneg_inbuf->DialectCount = cpu_to_le16(4);
1333 /* structure is big enough for 4 dialects */
1334 inbuflen = sizeof(*pneg_inbuf);
1335 } else {
1336 /* otherwise specific dialect was requested */
1337 pneg_inbuf->Dialects[0] =
1338 cpu_to_le16(server->vals->protocol_id);
1339 pneg_inbuf->DialectCount = cpu_to_le16(1);
1340 /* structure is big enough for 4 dialects, sending only 1 */
1341 inbuflen = sizeof(*pneg_inbuf) -
1342 sizeof(pneg_inbuf->Dialects[0]) * 3;
1343 }
1344
1345 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1346 FSCTL_VALIDATE_NEGOTIATE_INFO,
1347 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1348 (char **)&pneg_rsp, &rsplen);
1349 if (rc == -EOPNOTSUPP) {
1350 /*
1351 * Old Windows versions or Netapp SMB server can return
1352 * not supported error. Client should accept it.
1353 */
1354 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1355 rc = 0;
1356 goto out_free_inbuf;
1357 } else if (rc != 0) {
1358 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1359 rc);
1360 rc = -EIO;
1361 goto out_free_inbuf;
1362 }
1363
1364 rc = -EIO;
1365 if (rsplen != sizeof(*pneg_rsp)) {
1366 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1367 rsplen);
1368
1369 /* relax check since Mac returns max bufsize allowed on ioctl */
1370 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1371 goto out_free_rsp;
1372 }
1373
1374 /* check validate negotiate info response matches what we got earlier */
1375 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1376 goto vneg_out;
1377
1378 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1379 goto vneg_out;
1380
1381 /* do not validate server guid because not saved at negprot time yet */
1382
1383 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1384 SMB2_LARGE_FILES) != server->capabilities)
1385 goto vneg_out;
1386
1387 /* validate negotiate successful */
1388 rc = 0;
1389 cifs_dbg(FYI, "validate negotiate info successful\n");
1390 goto out_free_rsp;
1391
1392 vneg_out:
1393 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1394 out_free_rsp:
1395 kfree(pneg_rsp);
1396 out_free_inbuf:
1397 kfree(pneg_inbuf);
1398 return rc;
1399 }
1400
1401 enum securityEnum
smb2_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1402 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1403 {
1404 switch (requested) {
1405 case Kerberos:
1406 case RawNTLMSSP:
1407 return requested;
1408 case NTLMv2:
1409 return RawNTLMSSP;
1410 case Unspecified:
1411 if (server->sec_ntlmssp &&
1412 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1413 return RawNTLMSSP;
1414 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
1415 (global_secflags & CIFSSEC_MAY_KRB5))
1416 return Kerberos;
1417 fallthrough;
1418 default:
1419 return Unspecified;
1420 }
1421 }
1422
1423 struct SMB2_sess_data {
1424 unsigned int xid;
1425 struct cifs_ses *ses;
1426 struct TCP_Server_Info *server;
1427 struct nls_table *nls_cp;
1428 void (*func)(struct SMB2_sess_data *);
1429 int result;
1430 u64 previous_session;
1431
1432 /* we will send the SMB in three pieces:
1433 * a fixed length beginning part, an optional
1434 * SPNEGO blob (which can be zero length), and a
1435 * last part which will include the strings
1436 * and rest of bcc area. This allows us to avoid
1437 * a large buffer 17K allocation
1438 */
1439 int buf0_type;
1440 struct kvec iov[2];
1441 };
1442
1443 static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data * sess_data)1444 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1445 {
1446 int rc;
1447 struct cifs_ses *ses = sess_data->ses;
1448 struct TCP_Server_Info *server = sess_data->server;
1449 struct smb2_sess_setup_req *req;
1450 unsigned int total_len;
1451 bool is_binding = false;
1452
1453 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1454 (void **) &req,
1455 &total_len);
1456 if (rc)
1457 return rc;
1458
1459 spin_lock(&ses->ses_lock);
1460 is_binding = (ses->ses_status == SES_GOOD);
1461 spin_unlock(&ses->ses_lock);
1462
1463 if (is_binding) {
1464 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1465 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1466 req->PreviousSessionId = 0;
1467 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1468 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1469 } else {
1470 /* First session, not a reauthenticate */
1471 req->hdr.SessionId = 0;
1472 /*
1473 * if reconnect, we need to send previous sess id
1474 * otherwise it is 0
1475 */
1476 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1477 req->Flags = 0; /* MBZ */
1478 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1479 sess_data->previous_session);
1480 }
1481
1482 /* enough to enable echos and oplocks and one max size write */
1483 if (server->credits >= server->max_credits)
1484 req->hdr.CreditRequest = cpu_to_le16(0);
1485 else
1486 req->hdr.CreditRequest = cpu_to_le16(
1487 min_t(int, server->max_credits -
1488 server->credits, 130));
1489
1490 /* only one of SMB2 signing flags may be set in SMB2 request */
1491 if (server->sign)
1492 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1493 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1494 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1495 else
1496 req->SecurityMode = 0;
1497
1498 #ifdef CONFIG_CIFS_DFS_UPCALL
1499 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1500 #else
1501 req->Capabilities = 0;
1502 #endif /* DFS_UPCALL */
1503
1504 req->Channel = 0; /* MBZ */
1505
1506 sess_data->iov[0].iov_base = (char *)req;
1507 /* 1 for pad */
1508 sess_data->iov[0].iov_len = total_len - 1;
1509 /*
1510 * This variable will be used to clear the buffer
1511 * allocated above in case of any error in the calling function.
1512 */
1513 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1514
1515 return 0;
1516 }
1517
1518 static void
SMB2_sess_free_buffer(struct SMB2_sess_data * sess_data)1519 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1520 {
1521 struct kvec *iov = sess_data->iov;
1522
1523 /* iov[1] is already freed by caller */
1524 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1525 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1526
1527 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1528 sess_data->buf0_type = CIFS_NO_BUFFER;
1529 }
1530
1531 static int
SMB2_sess_sendreceive(struct SMB2_sess_data * sess_data)1532 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1533 {
1534 int rc;
1535 struct smb_rqst rqst;
1536 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1537 struct kvec rsp_iov = { NULL, 0 };
1538
1539 /* Testing shows that buffer offset must be at location of Buffer[0] */
1540 req->SecurityBufferOffset =
1541 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1542 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1543
1544 memset(&rqst, 0, sizeof(struct smb_rqst));
1545 rqst.rq_iov = sess_data->iov;
1546 rqst.rq_nvec = 2;
1547
1548 /* BB add code to build os and lm fields */
1549 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1550 sess_data->server,
1551 &rqst,
1552 &sess_data->buf0_type,
1553 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1554 cifs_small_buf_release(sess_data->iov[0].iov_base);
1555 if (rc == 0)
1556 sess_data->ses->expired_pwd = false;
1557 else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
1558 if (sess_data->ses->expired_pwd == false)
1559 trace_smb3_key_expired(sess_data->server->hostname,
1560 sess_data->ses->user_name,
1561 sess_data->server->conn_id,
1562 &sess_data->server->dstaddr, rc);
1563 sess_data->ses->expired_pwd = true;
1564 }
1565
1566 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1567
1568 return rc;
1569 }
1570
1571 static int
SMB2_sess_establish_session(struct SMB2_sess_data * sess_data)1572 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1573 {
1574 int rc = 0;
1575 struct cifs_ses *ses = sess_data->ses;
1576 struct TCP_Server_Info *server = sess_data->server;
1577
1578 cifs_server_lock(server);
1579 if (server->ops->generate_signingkey) {
1580 rc = server->ops->generate_signingkey(ses, server);
1581 if (rc) {
1582 cifs_dbg(FYI,
1583 "SMB3 session key generation failed\n");
1584 cifs_server_unlock(server);
1585 return rc;
1586 }
1587 }
1588 if (!server->session_estab) {
1589 server->sequence_number = 0x2;
1590 server->session_estab = true;
1591 }
1592 cifs_server_unlock(server);
1593
1594 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1595 return rc;
1596 }
1597
1598 #ifdef CONFIG_CIFS_UPCALL
1599 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1600 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1601 {
1602 int rc;
1603 struct cifs_ses *ses = sess_data->ses;
1604 struct TCP_Server_Info *server = sess_data->server;
1605 struct cifs_spnego_msg *msg;
1606 struct key *spnego_key = NULL;
1607 struct smb2_sess_setup_rsp *rsp = NULL;
1608 bool is_binding = false;
1609
1610 rc = SMB2_sess_alloc_buffer(sess_data);
1611 if (rc)
1612 goto out;
1613
1614 spnego_key = cifs_get_spnego_key(ses, server);
1615 if (IS_ERR(spnego_key)) {
1616 rc = PTR_ERR(spnego_key);
1617 if (rc == -ENOKEY)
1618 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1619 spnego_key = NULL;
1620 goto out;
1621 }
1622
1623 msg = spnego_key->payload.data[0];
1624 /*
1625 * check version field to make sure that cifs.upcall is
1626 * sending us a response in an expected form
1627 */
1628 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1629 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1630 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1631 rc = -EKEYREJECTED;
1632 goto out_put_spnego_key;
1633 }
1634
1635 spin_lock(&ses->ses_lock);
1636 is_binding = (ses->ses_status == SES_GOOD);
1637 spin_unlock(&ses->ses_lock);
1638
1639 /* keep session key if binding */
1640 if (!is_binding) {
1641 kfree_sensitive(ses->auth_key.response);
1642 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1643 GFP_KERNEL);
1644 if (!ses->auth_key.response) {
1645 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1646 msg->sesskey_len);
1647 rc = -ENOMEM;
1648 goto out_put_spnego_key;
1649 }
1650 ses->auth_key.len = msg->sesskey_len;
1651 }
1652
1653 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1654 sess_data->iov[1].iov_len = msg->secblob_len;
1655
1656 rc = SMB2_sess_sendreceive(sess_data);
1657 if (rc)
1658 goto out_put_spnego_key;
1659
1660 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1661 /* keep session id and flags if binding */
1662 if (!is_binding) {
1663 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1664 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1665 }
1666
1667 rc = SMB2_sess_establish_session(sess_data);
1668 out_put_spnego_key:
1669 key_invalidate(spnego_key);
1670 key_put(spnego_key);
1671 if (rc) {
1672 kfree_sensitive(ses->auth_key.response);
1673 ses->auth_key.response = NULL;
1674 ses->auth_key.len = 0;
1675 }
1676 out:
1677 sess_data->result = rc;
1678 sess_data->func = NULL;
1679 SMB2_sess_free_buffer(sess_data);
1680 }
1681 #else
1682 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1683 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1684 {
1685 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1686 sess_data->result = -EOPNOTSUPP;
1687 sess_data->func = NULL;
1688 }
1689 #endif
1690
1691 static void
1692 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1693
1694 static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data * sess_data)1695 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1696 {
1697 int rc;
1698 struct cifs_ses *ses = sess_data->ses;
1699 struct TCP_Server_Info *server = sess_data->server;
1700 struct smb2_sess_setup_rsp *rsp = NULL;
1701 unsigned char *ntlmssp_blob = NULL;
1702 bool use_spnego = false; /* else use raw ntlmssp */
1703 u16 blob_length = 0;
1704 bool is_binding = false;
1705
1706 /*
1707 * If memory allocation is successful, caller of this function
1708 * frees it.
1709 */
1710 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1711 if (!ses->ntlmssp) {
1712 rc = -ENOMEM;
1713 goto out_err;
1714 }
1715 ses->ntlmssp->sesskey_per_smbsess = true;
1716
1717 rc = SMB2_sess_alloc_buffer(sess_data);
1718 if (rc)
1719 goto out_err;
1720
1721 rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1722 &blob_length, ses, server,
1723 sess_data->nls_cp);
1724 if (rc)
1725 goto out;
1726
1727 if (use_spnego) {
1728 /* BB eventually need to add this */
1729 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1730 rc = -EOPNOTSUPP;
1731 goto out;
1732 }
1733 sess_data->iov[1].iov_base = ntlmssp_blob;
1734 sess_data->iov[1].iov_len = blob_length;
1735
1736 rc = SMB2_sess_sendreceive(sess_data);
1737 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1738
1739 /* If true, rc here is expected and not an error */
1740 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1741 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1742 rc = 0;
1743
1744 if (rc)
1745 goto out;
1746
1747 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1748 le16_to_cpu(rsp->SecurityBufferOffset)) {
1749 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1750 le16_to_cpu(rsp->SecurityBufferOffset));
1751 rc = -EIO;
1752 goto out;
1753 }
1754 rc = decode_ntlmssp_challenge(rsp->Buffer,
1755 le16_to_cpu(rsp->SecurityBufferLength), ses);
1756 if (rc)
1757 goto out;
1758
1759 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1760
1761 spin_lock(&ses->ses_lock);
1762 is_binding = (ses->ses_status == SES_GOOD);
1763 spin_unlock(&ses->ses_lock);
1764
1765 /* keep existing ses id and flags if binding */
1766 if (!is_binding) {
1767 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1768 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1769 }
1770
1771 out:
1772 kfree_sensitive(ntlmssp_blob);
1773 SMB2_sess_free_buffer(sess_data);
1774 if (!rc) {
1775 sess_data->result = 0;
1776 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1777 return;
1778 }
1779 out_err:
1780 kfree_sensitive(ses->ntlmssp);
1781 ses->ntlmssp = NULL;
1782 sess_data->result = rc;
1783 sess_data->func = NULL;
1784 }
1785
1786 static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data * sess_data)1787 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1788 {
1789 int rc;
1790 struct cifs_ses *ses = sess_data->ses;
1791 struct TCP_Server_Info *server = sess_data->server;
1792 struct smb2_sess_setup_req *req;
1793 struct smb2_sess_setup_rsp *rsp = NULL;
1794 unsigned char *ntlmssp_blob = NULL;
1795 bool use_spnego = false; /* else use raw ntlmssp */
1796 u16 blob_length = 0;
1797 bool is_binding = false;
1798
1799 rc = SMB2_sess_alloc_buffer(sess_data);
1800 if (rc)
1801 goto out;
1802
1803 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1804 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1805
1806 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1807 ses, server,
1808 sess_data->nls_cp);
1809 if (rc) {
1810 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1811 goto out;
1812 }
1813
1814 if (use_spnego) {
1815 /* BB eventually need to add this */
1816 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1817 rc = -EOPNOTSUPP;
1818 goto out;
1819 }
1820 sess_data->iov[1].iov_base = ntlmssp_blob;
1821 sess_data->iov[1].iov_len = blob_length;
1822
1823 rc = SMB2_sess_sendreceive(sess_data);
1824 if (rc)
1825 goto out;
1826
1827 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1828
1829 spin_lock(&ses->ses_lock);
1830 is_binding = (ses->ses_status == SES_GOOD);
1831 spin_unlock(&ses->ses_lock);
1832
1833 /* keep existing ses id and flags if binding */
1834 if (!is_binding) {
1835 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1836 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1837 }
1838
1839 rc = SMB2_sess_establish_session(sess_data);
1840 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1841 if (ses->server->dialect < SMB30_PROT_ID) {
1842 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1843 /*
1844 * The session id is opaque in terms of endianness, so we can't
1845 * print it as a long long. we dump it as we got it on the wire
1846 */
1847 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
1848 &ses->Suid);
1849 cifs_dbg(VFS, "Session Key %*ph\n",
1850 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1851 cifs_dbg(VFS, "Signing Key %*ph\n",
1852 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1853 }
1854 #endif
1855 out:
1856 kfree_sensitive(ntlmssp_blob);
1857 SMB2_sess_free_buffer(sess_data);
1858 kfree_sensitive(ses->ntlmssp);
1859 ses->ntlmssp = NULL;
1860 sess_data->result = rc;
1861 sess_data->func = NULL;
1862 }
1863
1864 static int
SMB2_select_sec(struct SMB2_sess_data * sess_data)1865 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1866 {
1867 int type;
1868 struct cifs_ses *ses = sess_data->ses;
1869 struct TCP_Server_Info *server = sess_data->server;
1870
1871 type = smb2_select_sectype(server, ses->sectype);
1872 cifs_dbg(FYI, "sess setup type %d\n", type);
1873 if (type == Unspecified) {
1874 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1875 return -EINVAL;
1876 }
1877
1878 switch (type) {
1879 case Kerberos:
1880 sess_data->func = SMB2_auth_kerberos;
1881 break;
1882 case RawNTLMSSP:
1883 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1884 break;
1885 default:
1886 cifs_dbg(VFS, "secType %d not supported!\n", type);
1887 return -EOPNOTSUPP;
1888 }
1889
1890 return 0;
1891 }
1892
1893 int
SMB2_sess_setup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1894 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1895 struct TCP_Server_Info *server,
1896 const struct nls_table *nls_cp)
1897 {
1898 int rc = 0;
1899 struct SMB2_sess_data *sess_data;
1900
1901 cifs_dbg(FYI, "Session Setup\n");
1902
1903 if (!server) {
1904 WARN(1, "%s: server is NULL!\n", __func__);
1905 return -EIO;
1906 }
1907
1908 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1909 if (!sess_data)
1910 return -ENOMEM;
1911
1912 sess_data->xid = xid;
1913 sess_data->ses = ses;
1914 sess_data->server = server;
1915 sess_data->buf0_type = CIFS_NO_BUFFER;
1916 sess_data->nls_cp = (struct nls_table *) nls_cp;
1917 sess_data->previous_session = ses->Suid;
1918
1919 rc = SMB2_select_sec(sess_data);
1920 if (rc)
1921 goto out;
1922
1923 /*
1924 * Initialize the session hash with the server one.
1925 */
1926 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1927 SMB2_PREAUTH_HASH_SIZE);
1928
1929 while (sess_data->func)
1930 sess_data->func(sess_data);
1931
1932 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1933 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1934 rc = sess_data->result;
1935 out:
1936 kfree_sensitive(sess_data);
1937 return rc;
1938 }
1939
1940 int
SMB2_logoff(const unsigned int xid,struct cifs_ses * ses)1941 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1942 {
1943 struct smb_rqst rqst;
1944 struct smb2_logoff_req *req; /* response is also trivial struct */
1945 int rc = 0;
1946 struct TCP_Server_Info *server;
1947 int flags = 0;
1948 unsigned int total_len;
1949 struct kvec iov[1];
1950 struct kvec rsp_iov;
1951 int resp_buf_type;
1952
1953 cifs_dbg(FYI, "disconnect session %p\n", ses);
1954
1955 if (ses && (ses->server))
1956 server = ses->server;
1957 else
1958 return -EIO;
1959
1960 /* no need to send SMB logoff if uid already closed due to reconnect */
1961 spin_lock(&ses->chan_lock);
1962 if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1963 spin_unlock(&ses->chan_lock);
1964 goto smb2_session_already_dead;
1965 }
1966 spin_unlock(&ses->chan_lock);
1967
1968 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1969 (void **) &req, &total_len);
1970 if (rc)
1971 return rc;
1972
1973 /* since no tcon, smb2_init can not do this, so do here */
1974 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1975
1976 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1977 flags |= CIFS_TRANSFORM_REQ;
1978 else if (server->sign)
1979 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1980
1981 flags |= CIFS_NO_RSP_BUF;
1982
1983 iov[0].iov_base = (char *)req;
1984 iov[0].iov_len = total_len;
1985
1986 memset(&rqst, 0, sizeof(struct smb_rqst));
1987 rqst.rq_iov = iov;
1988 rqst.rq_nvec = 1;
1989
1990 rc = cifs_send_recv(xid, ses, ses->server,
1991 &rqst, &resp_buf_type, flags, &rsp_iov);
1992 cifs_small_buf_release(req);
1993 /*
1994 * No tcon so can't do
1995 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1996 */
1997
1998 smb2_session_already_dead:
1999 return rc;
2000 }
2001
cifs_stats_fail_inc(struct cifs_tcon * tcon,uint16_t code)2002 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2003 {
2004 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2005 }
2006
2007 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2008
2009 /* These are similar values to what Windows uses */
init_copy_chunk_defaults(struct cifs_tcon * tcon)2010 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2011 {
2012 tcon->max_chunks = 256;
2013 tcon->max_bytes_chunk = 1048576;
2014 tcon->max_bytes_copy = 16777216;
2015 }
2016
2017 int
SMB2_tcon(const unsigned int xid,struct cifs_ses * ses,const char * tree,struct cifs_tcon * tcon,const struct nls_table * cp)2018 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2019 struct cifs_tcon *tcon, const struct nls_table *cp)
2020 {
2021 struct smb_rqst rqst;
2022 struct smb2_tree_connect_req *req;
2023 struct smb2_tree_connect_rsp *rsp = NULL;
2024 struct kvec iov[2];
2025 struct kvec rsp_iov = { NULL, 0 };
2026 int rc = 0;
2027 int resp_buftype;
2028 int unc_path_len;
2029 __le16 *unc_path = NULL;
2030 int flags = 0;
2031 unsigned int total_len;
2032 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2033
2034 cifs_dbg(FYI, "TCON\n");
2035
2036 if (!server || !tree)
2037 return -EIO;
2038
2039 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2040 if (unc_path == NULL)
2041 return -ENOMEM;
2042
2043 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2044 if (unc_path_len <= 0) {
2045 kfree(unc_path);
2046 return -EINVAL;
2047 }
2048 unc_path_len *= 2;
2049
2050 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2051 tcon->tid = 0;
2052 atomic_set(&tcon->num_remote_opens, 0);
2053 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2054 (void **) &req, &total_len);
2055 if (rc) {
2056 kfree(unc_path);
2057 return rc;
2058 }
2059
2060 if (smb3_encryption_required(tcon))
2061 flags |= CIFS_TRANSFORM_REQ;
2062
2063 iov[0].iov_base = (char *)req;
2064 /* 1 for pad */
2065 iov[0].iov_len = total_len - 1;
2066
2067 /* Testing shows that buffer offset must be at location of Buffer[0] */
2068 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2069 req->PathLength = cpu_to_le16(unc_path_len);
2070 iov[1].iov_base = unc_path;
2071 iov[1].iov_len = unc_path_len;
2072
2073 /*
2074 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2075 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2076 * (Samba servers don't always set the flag so also check if null user)
2077 */
2078 if ((server->dialect == SMB311_PROT_ID) &&
2079 !smb3_encryption_required(tcon) &&
2080 !(ses->session_flags &
2081 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2082 ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2083 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2084
2085 memset(&rqst, 0, sizeof(struct smb_rqst));
2086 rqst.rq_iov = iov;
2087 rqst.rq_nvec = 2;
2088
2089 /* Need 64 for max size write so ask for more in case not there yet */
2090 if (server->credits >= server->max_credits)
2091 req->hdr.CreditRequest = cpu_to_le16(0);
2092 else
2093 req->hdr.CreditRequest = cpu_to_le16(
2094 min_t(int, server->max_credits -
2095 server->credits, 64));
2096
2097 rc = cifs_send_recv(xid, ses, server,
2098 &rqst, &resp_buftype, flags, &rsp_iov);
2099 cifs_small_buf_release(req);
2100 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2101 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2102 if ((rc != 0) || (rsp == NULL)) {
2103 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2104 tcon->need_reconnect = true;
2105 goto tcon_error_exit;
2106 }
2107
2108 switch (rsp->ShareType) {
2109 case SMB2_SHARE_TYPE_DISK:
2110 cifs_dbg(FYI, "connection to disk share\n");
2111 break;
2112 case SMB2_SHARE_TYPE_PIPE:
2113 tcon->pipe = true;
2114 cifs_dbg(FYI, "connection to pipe share\n");
2115 break;
2116 case SMB2_SHARE_TYPE_PRINT:
2117 tcon->print = true;
2118 cifs_dbg(FYI, "connection to printer\n");
2119 break;
2120 default:
2121 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2122 rc = -EOPNOTSUPP;
2123 goto tcon_error_exit;
2124 }
2125
2126 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2127 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2128 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2129 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2130 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2131
2132 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2133 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2134 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2135
2136 if (tcon->seal &&
2137 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2138 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2139
2140 init_copy_chunk_defaults(tcon);
2141 if (server->ops->validate_negotiate)
2142 rc = server->ops->validate_negotiate(xid, tcon);
2143 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2144 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2145 server->nosharesock = true;
2146 tcon_exit:
2147
2148 free_rsp_buf(resp_buftype, rsp);
2149 kfree(unc_path);
2150 return rc;
2151
2152 tcon_error_exit:
2153 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2154 cifs_dbg(VFS | ONCE, "BAD_NETWORK_NAME: %s\n", tree);
2155 goto tcon_exit;
2156 }
2157
2158 int
SMB2_tdis(const unsigned int xid,struct cifs_tcon * tcon)2159 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2160 {
2161 struct smb_rqst rqst;
2162 struct smb2_tree_disconnect_req *req; /* response is trivial */
2163 int rc = 0;
2164 struct cifs_ses *ses = tcon->ses;
2165 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2166 int flags = 0;
2167 unsigned int total_len;
2168 struct kvec iov[1];
2169 struct kvec rsp_iov;
2170 int resp_buf_type;
2171
2172 cifs_dbg(FYI, "Tree Disconnect\n");
2173
2174 if (!ses || !(ses->server))
2175 return -EIO;
2176
2177 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2178 spin_lock(&ses->chan_lock);
2179 if ((tcon->need_reconnect) ||
2180 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2181 spin_unlock(&ses->chan_lock);
2182 return 0;
2183 }
2184 spin_unlock(&ses->chan_lock);
2185
2186 invalidate_all_cached_dirs(tcon);
2187
2188 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2189 (void **) &req,
2190 &total_len);
2191 if (rc)
2192 return rc;
2193
2194 if (smb3_encryption_required(tcon))
2195 flags |= CIFS_TRANSFORM_REQ;
2196
2197 flags |= CIFS_NO_RSP_BUF;
2198
2199 iov[0].iov_base = (char *)req;
2200 iov[0].iov_len = total_len;
2201
2202 memset(&rqst, 0, sizeof(struct smb_rqst));
2203 rqst.rq_iov = iov;
2204 rqst.rq_nvec = 1;
2205
2206 rc = cifs_send_recv(xid, ses, server,
2207 &rqst, &resp_buf_type, flags, &rsp_iov);
2208 cifs_small_buf_release(req);
2209 if (rc) {
2210 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2211 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2212 }
2213 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2214
2215 return rc;
2216 }
2217
2218
2219 static struct create_durable *
create_durable_buf(void)2220 create_durable_buf(void)
2221 {
2222 struct create_durable *buf;
2223
2224 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2225 if (!buf)
2226 return NULL;
2227
2228 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2229 (struct create_durable, Data));
2230 buf->ccontext.DataLength = cpu_to_le32(16);
2231 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2232 (struct create_durable, Name));
2233 buf->ccontext.NameLength = cpu_to_le16(4);
2234 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2235 buf->Name[0] = 'D';
2236 buf->Name[1] = 'H';
2237 buf->Name[2] = 'n';
2238 buf->Name[3] = 'Q';
2239 return buf;
2240 }
2241
2242 static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid * fid)2243 create_reconnect_durable_buf(struct cifs_fid *fid)
2244 {
2245 struct create_durable *buf;
2246
2247 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2248 if (!buf)
2249 return NULL;
2250
2251 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2252 (struct create_durable, Data));
2253 buf->ccontext.DataLength = cpu_to_le32(16);
2254 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2255 (struct create_durable, Name));
2256 buf->ccontext.NameLength = cpu_to_le16(4);
2257 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2258 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2259 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2260 buf->Name[0] = 'D';
2261 buf->Name[1] = 'H';
2262 buf->Name[2] = 'n';
2263 buf->Name[3] = 'C';
2264 return buf;
2265 }
2266
2267 static void
parse_query_id_ctxt(struct create_context * cc,struct smb2_file_all_info * buf)2268 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2269 {
2270 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2271
2272 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2273 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2274 buf->IndexNumber = pdisk_id->DiskFileId;
2275 }
2276
2277 static void
parse_posix_ctxt(struct create_context * cc,struct smb2_file_all_info * info,struct create_posix_rsp * posix)2278 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2279 struct create_posix_rsp *posix)
2280 {
2281 int sid_len;
2282 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2283 u8 *end = beg + le32_to_cpu(cc->DataLength);
2284 u8 *sid;
2285
2286 memset(posix, 0, sizeof(*posix));
2287
2288 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2289 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2290 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2291
2292 sid = beg + 12;
2293 sid_len = posix_info_sid_size(sid, end);
2294 if (sid_len < 0) {
2295 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2296 return;
2297 }
2298 memcpy(&posix->owner, sid, sid_len);
2299
2300 sid = sid + sid_len;
2301 sid_len = posix_info_sid_size(sid, end);
2302 if (sid_len < 0) {
2303 cifs_dbg(VFS, "bad group sid in posix create response\n");
2304 return;
2305 }
2306 memcpy(&posix->group, sid, sid_len);
2307
2308 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2309 posix->nlink, posix->mode, posix->reparse_tag);
2310 }
2311
smb2_parse_contexts(struct TCP_Server_Info * server,struct kvec * rsp_iov,__u16 * epoch,char * lease_key,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix)2312 int smb2_parse_contexts(struct TCP_Server_Info *server,
2313 struct kvec *rsp_iov,
2314 __u16 *epoch,
2315 char *lease_key, __u8 *oplock,
2316 struct smb2_file_all_info *buf,
2317 struct create_posix_rsp *posix)
2318 {
2319 struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2320 struct create_context *cc;
2321 size_t rem, off, len;
2322 size_t doff, dlen;
2323 size_t noff, nlen;
2324 char *name;
2325 static const char smb3_create_tag_posix[] = {
2326 0x93, 0xAD, 0x25, 0x50, 0x9C,
2327 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2328 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2329 };
2330
2331 *oplock = 0;
2332
2333 off = le32_to_cpu(rsp->CreateContextsOffset);
2334 rem = le32_to_cpu(rsp->CreateContextsLength);
2335 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2336 return -EINVAL;
2337 cc = (struct create_context *)((u8 *)rsp + off);
2338
2339 /* Initialize inode number to 0 in case no valid data in qfid context */
2340 if (buf)
2341 buf->IndexNumber = 0;
2342
2343 while (rem >= sizeof(*cc)) {
2344 doff = le16_to_cpu(cc->DataOffset);
2345 dlen = le32_to_cpu(cc->DataLength);
2346 if (check_add_overflow(doff, dlen, &len) || len > rem)
2347 return -EINVAL;
2348
2349 noff = le16_to_cpu(cc->NameOffset);
2350 nlen = le16_to_cpu(cc->NameLength);
2351 if (noff + nlen > doff)
2352 return -EINVAL;
2353
2354 name = (char *)cc + noff;
2355 switch (nlen) {
2356 case 4:
2357 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2358 *oplock = server->ops->parse_lease_buf(cc, epoch,
2359 lease_key);
2360 } else if (buf &&
2361 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2362 parse_query_id_ctxt(cc, buf);
2363 }
2364 break;
2365 case 16:
2366 if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2367 parse_posix_ctxt(cc, buf, posix);
2368 break;
2369 default:
2370 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2371 __func__, nlen, dlen);
2372 if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2373 cifs_dump_mem("context data: ", cc, dlen);
2374 break;
2375 }
2376
2377 off = le32_to_cpu(cc->Next);
2378 if (!off)
2379 break;
2380 if (check_sub_overflow(rem, off, &rem))
2381 return -EINVAL;
2382 cc = (struct create_context *)((u8 *)cc + off);
2383 }
2384
2385 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2386 *oplock = rsp->OplockLevel;
2387
2388 return 0;
2389 }
2390
2391 static int
add_lease_context(struct TCP_Server_Info * server,struct smb2_create_req * req,struct kvec * iov,unsigned int * num_iovec,u8 * lease_key,__u8 * oplock)2392 add_lease_context(struct TCP_Server_Info *server,
2393 struct smb2_create_req *req,
2394 struct kvec *iov,
2395 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2396 {
2397 unsigned int num = *num_iovec;
2398
2399 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2400 if (iov[num].iov_base == NULL)
2401 return -ENOMEM;
2402 iov[num].iov_len = server->vals->create_lease_size;
2403 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2404 *num_iovec = num + 1;
2405 return 0;
2406 }
2407
2408 static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_open_parms * oparms)2409 create_durable_v2_buf(struct cifs_open_parms *oparms)
2410 {
2411 struct cifs_fid *pfid = oparms->fid;
2412 struct create_durable_v2 *buf;
2413
2414 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2415 if (!buf)
2416 return NULL;
2417
2418 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2419 (struct create_durable_v2, dcontext));
2420 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2421 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2422 (struct create_durable_v2, Name));
2423 buf->ccontext.NameLength = cpu_to_le16(4);
2424
2425 /*
2426 * NB: Handle timeout defaults to 0, which allows server to choose
2427 * (most servers default to 120 seconds) and most clients default to 0.
2428 * This can be overridden at mount ("handletimeout=") if the user wants
2429 * a different persistent (or resilient) handle timeout for all opens
2430 * on a particular SMB3 mount.
2431 */
2432 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2433 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2434
2435 /* for replay, we should not overwrite the existing create guid */
2436 if (!oparms->replay) {
2437 generate_random_uuid(buf->dcontext.CreateGuid);
2438 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2439 } else
2440 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2441
2442 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2443 buf->Name[0] = 'D';
2444 buf->Name[1] = 'H';
2445 buf->Name[2] = '2';
2446 buf->Name[3] = 'Q';
2447 return buf;
2448 }
2449
2450 static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid * fid)2451 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2452 {
2453 struct create_durable_handle_reconnect_v2 *buf;
2454
2455 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2456 GFP_KERNEL);
2457 if (!buf)
2458 return NULL;
2459
2460 buf->ccontext.DataOffset =
2461 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2462 dcontext));
2463 buf->ccontext.DataLength =
2464 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2465 buf->ccontext.NameOffset =
2466 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2467 Name));
2468 buf->ccontext.NameLength = cpu_to_le16(4);
2469
2470 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2471 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2472 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2473 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2474
2475 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2476 buf->Name[0] = 'D';
2477 buf->Name[1] = 'H';
2478 buf->Name[2] = '2';
2479 buf->Name[3] = 'C';
2480 return buf;
2481 }
2482
2483 static int
add_durable_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2484 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2485 struct cifs_open_parms *oparms)
2486 {
2487 unsigned int num = *num_iovec;
2488
2489 iov[num].iov_base = create_durable_v2_buf(oparms);
2490 if (iov[num].iov_base == NULL)
2491 return -ENOMEM;
2492 iov[num].iov_len = sizeof(struct create_durable_v2);
2493 *num_iovec = num + 1;
2494 return 0;
2495 }
2496
2497 static int
add_durable_reconnect_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2498 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2499 struct cifs_open_parms *oparms)
2500 {
2501 unsigned int num = *num_iovec;
2502
2503 /* indicate that we don't need to relock the file */
2504 oparms->reconnect = false;
2505
2506 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2507 if (iov[num].iov_base == NULL)
2508 return -ENOMEM;
2509 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2510 *num_iovec = num + 1;
2511 return 0;
2512 }
2513
2514 static int
add_durable_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms,bool use_persistent)2515 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2516 struct cifs_open_parms *oparms, bool use_persistent)
2517 {
2518 unsigned int num = *num_iovec;
2519
2520 if (use_persistent) {
2521 if (oparms->reconnect)
2522 return add_durable_reconnect_v2_context(iov, num_iovec,
2523 oparms);
2524 else
2525 return add_durable_v2_context(iov, num_iovec, oparms);
2526 }
2527
2528 if (oparms->reconnect) {
2529 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2530 /* indicate that we don't need to relock the file */
2531 oparms->reconnect = false;
2532 } else
2533 iov[num].iov_base = create_durable_buf();
2534 if (iov[num].iov_base == NULL)
2535 return -ENOMEM;
2536 iov[num].iov_len = sizeof(struct create_durable);
2537 *num_iovec = num + 1;
2538 return 0;
2539 }
2540
2541 /* See MS-SMB2 2.2.13.2.7 */
2542 static struct crt_twarp_ctxt *
create_twarp_buf(__u64 timewarp)2543 create_twarp_buf(__u64 timewarp)
2544 {
2545 struct crt_twarp_ctxt *buf;
2546
2547 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2548 if (!buf)
2549 return NULL;
2550
2551 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2552 (struct crt_twarp_ctxt, Timestamp));
2553 buf->ccontext.DataLength = cpu_to_le32(8);
2554 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2555 (struct crt_twarp_ctxt, Name));
2556 buf->ccontext.NameLength = cpu_to_le16(4);
2557 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2558 buf->Name[0] = 'T';
2559 buf->Name[1] = 'W';
2560 buf->Name[2] = 'r';
2561 buf->Name[3] = 'p';
2562 buf->Timestamp = cpu_to_le64(timewarp);
2563 return buf;
2564 }
2565
2566 /* See MS-SMB2 2.2.13.2.7 */
2567 static int
add_twarp_context(struct kvec * iov,unsigned int * num_iovec,__u64 timewarp)2568 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2569 {
2570 unsigned int num = *num_iovec;
2571
2572 iov[num].iov_base = create_twarp_buf(timewarp);
2573 if (iov[num].iov_base == NULL)
2574 return -ENOMEM;
2575 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2576 *num_iovec = num + 1;
2577 return 0;
2578 }
2579
2580 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
setup_owner_group_sids(char * buf)2581 static void setup_owner_group_sids(char *buf)
2582 {
2583 struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2584
2585 /* Populate the user ownership fields S-1-5-88-1 */
2586 sids->owner.Revision = 1;
2587 sids->owner.NumAuth = 3;
2588 sids->owner.Authority[5] = 5;
2589 sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2590 sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2591 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2592
2593 /* Populate the group ownership fields S-1-5-88-2 */
2594 sids->group.Revision = 1;
2595 sids->group.NumAuth = 3;
2596 sids->group.Authority[5] = 5;
2597 sids->group.SubAuthorities[0] = cpu_to_le32(88);
2598 sids->group.SubAuthorities[1] = cpu_to_le32(2);
2599 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2600
2601 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2602 }
2603
2604 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2605 static struct crt_sd_ctxt *
create_sd_buf(umode_t mode,bool set_owner,unsigned int * len)2606 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2607 {
2608 struct crt_sd_ctxt *buf;
2609 __u8 *ptr, *aclptr;
2610 unsigned int acelen, acl_size, ace_count;
2611 unsigned int owner_offset = 0;
2612 unsigned int group_offset = 0;
2613 struct smb3_acl acl = {};
2614
2615 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
2616
2617 if (set_owner) {
2618 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2619 *len += sizeof(struct owner_group_sids);
2620 }
2621
2622 buf = kzalloc(*len, GFP_KERNEL);
2623 if (buf == NULL)
2624 return buf;
2625
2626 ptr = (__u8 *)&buf[1];
2627 if (set_owner) {
2628 /* offset fields are from beginning of security descriptor not of create context */
2629 owner_offset = ptr - (__u8 *)&buf->sd;
2630 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2631 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2632 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2633
2634 setup_owner_group_sids(ptr);
2635 ptr += sizeof(struct owner_group_sids);
2636 } else {
2637 buf->sd.OffsetOwner = 0;
2638 buf->sd.OffsetGroup = 0;
2639 }
2640
2641 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2642 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2643 buf->ccontext.NameLength = cpu_to_le16(4);
2644 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2645 buf->Name[0] = 'S';
2646 buf->Name[1] = 'e';
2647 buf->Name[2] = 'c';
2648 buf->Name[3] = 'D';
2649 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
2650
2651 /*
2652 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2653 * and "DP" ie the DACL is present
2654 */
2655 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2656
2657 /* offset owner, group and Sbz1 and SACL are all zero */
2658 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2659 /* Ship the ACL for now. we will copy it into buf later. */
2660 aclptr = ptr;
2661 ptr += sizeof(struct smb3_acl);
2662
2663 /* create one ACE to hold the mode embedded in reserved special SID */
2664 acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
2665 ptr += acelen;
2666 acl_size = acelen + sizeof(struct smb3_acl);
2667 ace_count = 1;
2668
2669 if (set_owner) {
2670 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2671 acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
2672 ptr += acelen;
2673 acl_size += acelen;
2674 ace_count += 1;
2675 }
2676
2677 /* and one more ACE to allow access for authenticated users */
2678 acelen = setup_authusers_ACE((struct smb_ace *)ptr);
2679 ptr += acelen;
2680 acl_size += acelen;
2681 ace_count += 1;
2682
2683 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2684 acl.AclSize = cpu_to_le16(acl_size);
2685 acl.AceCount = cpu_to_le16(ace_count);
2686 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2687 memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2688
2689 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2690 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2691
2692 return buf;
2693 }
2694
2695 static int
add_sd_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode,bool set_owner)2696 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2697 {
2698 unsigned int num = *num_iovec;
2699 unsigned int len = 0;
2700
2701 iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2702 if (iov[num].iov_base == NULL)
2703 return -ENOMEM;
2704 iov[num].iov_len = len;
2705 *num_iovec = num + 1;
2706 return 0;
2707 }
2708
2709 static struct crt_query_id_ctxt *
create_query_id_buf(void)2710 create_query_id_buf(void)
2711 {
2712 struct crt_query_id_ctxt *buf;
2713
2714 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2715 if (!buf)
2716 return NULL;
2717
2718 buf->ccontext.DataOffset = cpu_to_le16(0);
2719 buf->ccontext.DataLength = cpu_to_le32(0);
2720 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2721 (struct crt_query_id_ctxt, Name));
2722 buf->ccontext.NameLength = cpu_to_le16(4);
2723 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2724 buf->Name[0] = 'Q';
2725 buf->Name[1] = 'F';
2726 buf->Name[2] = 'i';
2727 buf->Name[3] = 'd';
2728 return buf;
2729 }
2730
2731 /* See MS-SMB2 2.2.13.2.9 */
2732 static int
add_query_id_context(struct kvec * iov,unsigned int * num_iovec)2733 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2734 {
2735 unsigned int num = *num_iovec;
2736
2737 iov[num].iov_base = create_query_id_buf();
2738 if (iov[num].iov_base == NULL)
2739 return -ENOMEM;
2740 iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2741 *num_iovec = num + 1;
2742 return 0;
2743 }
2744
add_ea_context(struct cifs_open_parms * oparms,struct kvec * rq_iov,unsigned int * num_iovs)2745 static void add_ea_context(struct cifs_open_parms *oparms,
2746 struct kvec *rq_iov, unsigned int *num_iovs)
2747 {
2748 struct kvec *iov = oparms->ea_cctx;
2749
2750 if (iov && iov->iov_base && iov->iov_len) {
2751 rq_iov[(*num_iovs)++] = *iov;
2752 memset(iov, 0, sizeof(*iov));
2753 }
2754 }
2755
2756 static int
alloc_path_with_tree_prefix(__le16 ** out_path,int * out_size,int * out_len,const char * treename,const __le16 * path)2757 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2758 const char *treename, const __le16 *path)
2759 {
2760 int treename_len, path_len;
2761 struct nls_table *cp;
2762 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2763
2764 /*
2765 * skip leading "\\"
2766 */
2767 treename_len = strlen(treename);
2768 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2769 return -EINVAL;
2770
2771 treename += 2;
2772 treename_len -= 2;
2773
2774 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2775
2776 /* make room for one path separator only if @path isn't empty */
2777 *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2778
2779 /*
2780 * final path needs to be 8-byte aligned as specified in
2781 * MS-SMB2 2.2.13 SMB2 CREATE Request.
2782 */
2783 *out_size = round_up(*out_len * sizeof(__le16), 8);
2784 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2785 if (!*out_path)
2786 return -ENOMEM;
2787
2788 cp = load_nls_default();
2789 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2790
2791 /* Do not append the separator if the path is empty */
2792 if (path[0] != cpu_to_le16(0x0000)) {
2793 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2794 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2795 }
2796
2797 unload_nls(cp);
2798
2799 return 0;
2800 }
2801
smb311_posix_mkdir(const unsigned int xid,struct inode * inode,umode_t mode,struct cifs_tcon * tcon,const char * full_path,struct cifs_sb_info * cifs_sb)2802 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2803 umode_t mode, struct cifs_tcon *tcon,
2804 const char *full_path,
2805 struct cifs_sb_info *cifs_sb)
2806 {
2807 struct smb_rqst rqst;
2808 struct smb2_create_req *req;
2809 struct smb2_create_rsp *rsp = NULL;
2810 struct cifs_ses *ses = tcon->ses;
2811 struct kvec iov[3]; /* make sure at least one for each open context */
2812 struct kvec rsp_iov = {NULL, 0};
2813 int resp_buftype;
2814 int uni_path_len;
2815 __le16 *copy_path = NULL;
2816 int copy_size;
2817 int rc = 0;
2818 unsigned int n_iov = 2;
2819 __u32 file_attributes = 0;
2820 char *pc_buf = NULL;
2821 int flags = 0;
2822 unsigned int total_len;
2823 __le16 *utf16_path = NULL;
2824 struct TCP_Server_Info *server;
2825 int retries = 0, cur_sleep = 1;
2826
2827 replay_again:
2828 /* reinitialize for possible replay */
2829 flags = 0;
2830 n_iov = 2;
2831 server = cifs_pick_channel(ses);
2832
2833 cifs_dbg(FYI, "mkdir\n");
2834
2835 /* resource #1: path allocation */
2836 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2837 if (!utf16_path)
2838 return -ENOMEM;
2839
2840 if (!ses || !server) {
2841 rc = -EIO;
2842 goto err_free_path;
2843 }
2844
2845 /* resource #2: request */
2846 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2847 (void **) &req, &total_len);
2848 if (rc)
2849 goto err_free_path;
2850
2851
2852 if (smb3_encryption_required(tcon))
2853 flags |= CIFS_TRANSFORM_REQ;
2854
2855 req->ImpersonationLevel = IL_IMPERSONATION;
2856 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2857 /* File attributes ignored on open (used in create though) */
2858 req->FileAttributes = cpu_to_le32(file_attributes);
2859 req->ShareAccess = FILE_SHARE_ALL_LE;
2860 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2861 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2862
2863 iov[0].iov_base = (char *)req;
2864 /* -1 since last byte is buf[0] which is sent below (path) */
2865 iov[0].iov_len = total_len - 1;
2866
2867 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2868
2869 /* [MS-SMB2] 2.2.13 NameOffset:
2870 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2871 * the SMB2 header, the file name includes a prefix that will
2872 * be processed during DFS name normalization as specified in
2873 * section 3.3.5.9. Otherwise, the file name is relative to
2874 * the share that is identified by the TreeId in the SMB2
2875 * header.
2876 */
2877 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2878 int name_len;
2879
2880 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2881 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2882 &name_len,
2883 tcon->tree_name, utf16_path);
2884 if (rc)
2885 goto err_free_req;
2886
2887 req->NameLength = cpu_to_le16(name_len * 2);
2888 uni_path_len = copy_size;
2889 /* free before overwriting resource */
2890 kfree(utf16_path);
2891 utf16_path = copy_path;
2892 } else {
2893 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2894 /* MUST set path len (NameLength) to 0 opening root of share */
2895 req->NameLength = cpu_to_le16(uni_path_len - 2);
2896 if (uni_path_len % 8 != 0) {
2897 copy_size = roundup(uni_path_len, 8);
2898 copy_path = kzalloc(copy_size, GFP_KERNEL);
2899 if (!copy_path) {
2900 rc = -ENOMEM;
2901 goto err_free_req;
2902 }
2903 memcpy((char *)copy_path, (const char *)utf16_path,
2904 uni_path_len);
2905 uni_path_len = copy_size;
2906 /* free before overwriting resource */
2907 kfree(utf16_path);
2908 utf16_path = copy_path;
2909 }
2910 }
2911
2912 iov[1].iov_len = uni_path_len;
2913 iov[1].iov_base = utf16_path;
2914 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2915
2916 if (tcon->posix_extensions) {
2917 /* resource #3: posix buf */
2918 rc = add_posix_context(iov, &n_iov, mode);
2919 if (rc)
2920 goto err_free_req;
2921 req->CreateContextsOffset = cpu_to_le32(
2922 sizeof(struct smb2_create_req) +
2923 iov[1].iov_len);
2924 le32_add_cpu(&req->CreateContextsLength, iov[n_iov-1].iov_len);
2925 pc_buf = iov[n_iov-1].iov_base;
2926 }
2927
2928
2929 memset(&rqst, 0, sizeof(struct smb_rqst));
2930 rqst.rq_iov = iov;
2931 rqst.rq_nvec = n_iov;
2932
2933 /* no need to inc num_remote_opens because we close it just below */
2934 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2935 FILE_WRITE_ATTRIBUTES);
2936
2937 if (retries)
2938 smb2_set_replay(server, &rqst);
2939
2940 /* resource #4: response buffer */
2941 rc = cifs_send_recv(xid, ses, server,
2942 &rqst, &resp_buftype, flags, &rsp_iov);
2943 if (rc) {
2944 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2945 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2946 CREATE_NOT_FILE,
2947 FILE_WRITE_ATTRIBUTES, rc);
2948 goto err_free_rsp_buf;
2949 }
2950
2951 /*
2952 * Although unlikely to be possible for rsp to be null and rc not set,
2953 * adding check below is slightly safer long term (and quiets Coverity
2954 * warning)
2955 */
2956 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2957 if (rsp == NULL) {
2958 rc = -EIO;
2959 kfree(pc_buf);
2960 goto err_free_req;
2961 }
2962
2963 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2964 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2965
2966 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2967
2968 /* Eventually save off posix specific response info and timestamps */
2969
2970 err_free_rsp_buf:
2971 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2972 kfree(pc_buf);
2973 err_free_req:
2974 cifs_small_buf_release(req);
2975 err_free_path:
2976 kfree(utf16_path);
2977
2978 if (is_replayable_error(rc) &&
2979 smb2_should_replay(tcon, &retries, &cur_sleep))
2980 goto replay_again;
2981
2982 return rc;
2983 }
2984
2985 int
SMB2_open_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,__u8 * oplock,struct cifs_open_parms * oparms,__le16 * path)2986 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2987 struct smb_rqst *rqst, __u8 *oplock,
2988 struct cifs_open_parms *oparms, __le16 *path)
2989 {
2990 struct smb2_create_req *req;
2991 unsigned int n_iov = 2;
2992 __u32 file_attributes = 0;
2993 int copy_size;
2994 int uni_path_len;
2995 unsigned int total_len;
2996 struct kvec *iov = rqst->rq_iov;
2997 __le16 *copy_path;
2998 int rc;
2999
3000 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3001 (void **) &req, &total_len);
3002 if (rc)
3003 return rc;
3004
3005 iov[0].iov_base = (char *)req;
3006 /* -1 since last byte is buf[0] which is sent below (path) */
3007 iov[0].iov_len = total_len - 1;
3008
3009 if (oparms->create_options & CREATE_OPTION_READONLY)
3010 file_attributes |= ATTR_READONLY;
3011 if (oparms->create_options & CREATE_OPTION_SPECIAL)
3012 file_attributes |= ATTR_SYSTEM;
3013
3014 req->ImpersonationLevel = IL_IMPERSONATION;
3015 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3016 /* File attributes ignored on open (used in create though) */
3017 req->FileAttributes = cpu_to_le32(file_attributes);
3018 req->ShareAccess = FILE_SHARE_ALL_LE;
3019
3020 req->CreateDisposition = cpu_to_le32(oparms->disposition);
3021 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3022 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3023
3024 /* [MS-SMB2] 2.2.13 NameOffset:
3025 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3026 * the SMB2 header, the file name includes a prefix that will
3027 * be processed during DFS name normalization as specified in
3028 * section 3.3.5.9. Otherwise, the file name is relative to
3029 * the share that is identified by the TreeId in the SMB2
3030 * header.
3031 */
3032 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3033 int name_len;
3034
3035 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3036 rc = alloc_path_with_tree_prefix(©_path, ©_size,
3037 &name_len,
3038 tcon->tree_name, path);
3039 if (rc)
3040 return rc;
3041 req->NameLength = cpu_to_le16(name_len * 2);
3042 uni_path_len = copy_size;
3043 path = copy_path;
3044 } else {
3045 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3046 /* MUST set path len (NameLength) to 0 opening root of share */
3047 req->NameLength = cpu_to_le16(uni_path_len - 2);
3048 copy_size = round_up(uni_path_len, 8);
3049 copy_path = kzalloc(copy_size, GFP_KERNEL);
3050 if (!copy_path)
3051 return -ENOMEM;
3052 memcpy((char *)copy_path, (const char *)path,
3053 uni_path_len);
3054 uni_path_len = copy_size;
3055 path = copy_path;
3056 }
3057
3058 iov[1].iov_len = uni_path_len;
3059 iov[1].iov_base = path;
3060
3061 if ((!server->oplocks) || (tcon->no_lease))
3062 *oplock = SMB2_OPLOCK_LEVEL_NONE;
3063
3064 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3065 *oplock == SMB2_OPLOCK_LEVEL_NONE)
3066 req->RequestedOplockLevel = *oplock;
3067 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3068 (oparms->create_options & CREATE_NOT_FILE))
3069 req->RequestedOplockLevel = *oplock; /* no srv lease support */
3070 else {
3071 rc = add_lease_context(server, req, iov, &n_iov,
3072 oparms->fid->lease_key, oplock);
3073 if (rc)
3074 return rc;
3075 }
3076
3077 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3078 rc = add_durable_context(iov, &n_iov, oparms,
3079 tcon->use_persistent);
3080 if (rc)
3081 return rc;
3082 }
3083
3084 if (tcon->posix_extensions) {
3085 rc = add_posix_context(iov, &n_iov, oparms->mode);
3086 if (rc)
3087 return rc;
3088 }
3089
3090 if (tcon->snapshot_time) {
3091 cifs_dbg(FYI, "adding snapshot context\n");
3092 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3093 if (rc)
3094 return rc;
3095 }
3096
3097 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3098 bool set_mode;
3099 bool set_owner;
3100
3101 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3102 (oparms->mode != ACL_NO_MODE))
3103 set_mode = true;
3104 else {
3105 set_mode = false;
3106 oparms->mode = ACL_NO_MODE;
3107 }
3108
3109 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3110 set_owner = true;
3111 else
3112 set_owner = false;
3113
3114 if (set_owner | set_mode) {
3115 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3116 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3117 if (rc)
3118 return rc;
3119 }
3120 }
3121
3122 add_query_id_context(iov, &n_iov);
3123 add_ea_context(oparms, iov, &n_iov);
3124
3125 if (n_iov > 2) {
3126 /*
3127 * We have create contexts behind iov[1] (the file
3128 * name), point at them from the main create request
3129 */
3130 req->CreateContextsOffset = cpu_to_le32(
3131 sizeof(struct smb2_create_req) +
3132 iov[1].iov_len);
3133 req->CreateContextsLength = 0;
3134
3135 for (unsigned int i = 2; i < (n_iov-1); i++) {
3136 struct kvec *v = &iov[i];
3137 size_t len = v->iov_len;
3138 struct create_context *cctx =
3139 (struct create_context *)v->iov_base;
3140
3141 cctx->Next = cpu_to_le32(len);
3142 le32_add_cpu(&req->CreateContextsLength, len);
3143 }
3144 le32_add_cpu(&req->CreateContextsLength,
3145 iov[n_iov-1].iov_len);
3146 }
3147
3148 rqst->rq_nvec = n_iov;
3149 return 0;
3150 }
3151
3152 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3153 * All other vectors are freed by kfree().
3154 */
3155 void
SMB2_open_free(struct smb_rqst * rqst)3156 SMB2_open_free(struct smb_rqst *rqst)
3157 {
3158 int i;
3159
3160 if (rqst && rqst->rq_iov) {
3161 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3162 for (i = 1; i < rqst->rq_nvec; i++)
3163 if (rqst->rq_iov[i].iov_base != smb2_padding)
3164 kfree(rqst->rq_iov[i].iov_base);
3165 }
3166 }
3167
3168 int
SMB2_open(const unsigned int xid,struct cifs_open_parms * oparms,__le16 * path,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix,struct kvec * err_iov,int * buftype)3169 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3170 __u8 *oplock, struct smb2_file_all_info *buf,
3171 struct create_posix_rsp *posix,
3172 struct kvec *err_iov, int *buftype)
3173 {
3174 struct smb_rqst rqst;
3175 struct smb2_create_rsp *rsp = NULL;
3176 struct cifs_tcon *tcon = oparms->tcon;
3177 struct cifs_ses *ses = tcon->ses;
3178 struct TCP_Server_Info *server;
3179 struct kvec iov[SMB2_CREATE_IOV_SIZE];
3180 struct kvec rsp_iov = {NULL, 0};
3181 int resp_buftype = CIFS_NO_BUFFER;
3182 int rc = 0;
3183 int flags = 0;
3184 int retries = 0, cur_sleep = 1;
3185
3186 replay_again:
3187 /* reinitialize for possible replay */
3188 flags = 0;
3189 server = cifs_pick_channel(ses);
3190 oparms->replay = !!(retries);
3191
3192 cifs_dbg(FYI, "create/open\n");
3193 if (!ses || !server)
3194 return -EIO;
3195
3196 if (smb3_encryption_required(tcon))
3197 flags |= CIFS_TRANSFORM_REQ;
3198
3199 memset(&rqst, 0, sizeof(struct smb_rqst));
3200 memset(&iov, 0, sizeof(iov));
3201 rqst.rq_iov = iov;
3202 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3203
3204 rc = SMB2_open_init(tcon, server,
3205 &rqst, oplock, oparms, path);
3206 if (rc)
3207 goto creat_exit;
3208
3209 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3210 oparms->create_options, oparms->desired_access);
3211
3212 if (retries)
3213 smb2_set_replay(server, &rqst);
3214
3215 rc = cifs_send_recv(xid, ses, server,
3216 &rqst, &resp_buftype, flags,
3217 &rsp_iov);
3218 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3219
3220 if (rc != 0) {
3221 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3222 if (err_iov && rsp) {
3223 *err_iov = rsp_iov;
3224 *buftype = resp_buftype;
3225 resp_buftype = CIFS_NO_BUFFER;
3226 rsp = NULL;
3227 }
3228 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3229 oparms->create_options, oparms->desired_access, rc);
3230 if (rc == -EREMCHG) {
3231 pr_warn_once("server share %s deleted\n",
3232 tcon->tree_name);
3233 tcon->need_reconnect = true;
3234 }
3235 goto creat_exit;
3236 } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3237 goto creat_exit;
3238 else
3239 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3240 oparms->create_options, oparms->desired_access);
3241
3242 atomic_inc(&tcon->num_remote_opens);
3243 oparms->fid->persistent_fid = rsp->PersistentFileId;
3244 oparms->fid->volatile_fid = rsp->VolatileFileId;
3245 oparms->fid->access = oparms->desired_access;
3246 #ifdef CONFIG_CIFS_DEBUG2
3247 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3248 #endif /* CIFS_DEBUG2 */
3249
3250 if (buf) {
3251 buf->CreationTime = rsp->CreationTime;
3252 buf->LastAccessTime = rsp->LastAccessTime;
3253 buf->LastWriteTime = rsp->LastWriteTime;
3254 buf->ChangeTime = rsp->ChangeTime;
3255 buf->AllocationSize = rsp->AllocationSize;
3256 buf->EndOfFile = rsp->EndofFile;
3257 buf->Attributes = rsp->FileAttributes;
3258 buf->NumberOfLinks = cpu_to_le32(1);
3259 buf->DeletePending = 0;
3260 }
3261
3262
3263 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3264 oparms->fid->lease_key, oplock, buf, posix);
3265 creat_exit:
3266 SMB2_open_free(&rqst);
3267 free_rsp_buf(resp_buftype, rsp);
3268
3269 if (is_replayable_error(rc) &&
3270 smb2_should_replay(tcon, &retries, &cur_sleep))
3271 goto replay_again;
3272
3273 return rc;
3274 }
3275
3276 int
SMB2_ioctl_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 opcode,char * in_data,u32 indatalen,__u32 max_response_size)3277 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3278 struct smb_rqst *rqst,
3279 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3280 char *in_data, u32 indatalen,
3281 __u32 max_response_size)
3282 {
3283 struct smb2_ioctl_req *req;
3284 struct kvec *iov = rqst->rq_iov;
3285 unsigned int total_len;
3286 int rc;
3287 char *in_data_buf;
3288
3289 rc = smb2_ioctl_req_init(opcode, tcon, server,
3290 (void **) &req, &total_len);
3291 if (rc)
3292 return rc;
3293
3294 if (indatalen) {
3295 /*
3296 * indatalen is usually small at a couple of bytes max, so
3297 * just allocate through generic pool
3298 */
3299 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3300 if (!in_data_buf) {
3301 cifs_small_buf_release(req);
3302 return -ENOMEM;
3303 }
3304 }
3305
3306 req->CtlCode = cpu_to_le32(opcode);
3307 req->PersistentFileId = persistent_fid;
3308 req->VolatileFileId = volatile_fid;
3309
3310 iov[0].iov_base = (char *)req;
3311 /*
3312 * If no input data, the size of ioctl struct in
3313 * protocol spec still includes a 1 byte data buffer,
3314 * but if input data passed to ioctl, we do not
3315 * want to double count this, so we do not send
3316 * the dummy one byte of data in iovec[0] if sending
3317 * input data (in iovec[1]).
3318 */
3319 if (indatalen) {
3320 req->InputCount = cpu_to_le32(indatalen);
3321 /* do not set InputOffset if no input data */
3322 req->InputOffset =
3323 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3324 rqst->rq_nvec = 2;
3325 iov[0].iov_len = total_len - 1;
3326 iov[1].iov_base = in_data_buf;
3327 iov[1].iov_len = indatalen;
3328 } else {
3329 rqst->rq_nvec = 1;
3330 iov[0].iov_len = total_len;
3331 }
3332
3333 req->OutputOffset = 0;
3334 req->OutputCount = 0; /* MBZ */
3335
3336 /*
3337 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3338 * We Could increase default MaxOutputResponse, but that could require
3339 * more credits. Windows typically sets this smaller, but for some
3340 * ioctls it may be useful to allow server to send more. No point
3341 * limiting what the server can send as long as fits in one credit
3342 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3343 * to increase this limit up in the future.
3344 * Note that for snapshot queries that servers like Azure expect that
3345 * the first query be minimal size (and just used to get the number/size
3346 * of previous versions) so response size must be specified as EXACTLY
3347 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3348 * of eight bytes. Currently that is the only case where we set max
3349 * response size smaller.
3350 */
3351 req->MaxOutputResponse = cpu_to_le32(max_response_size);
3352 req->hdr.CreditCharge =
3353 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3354 SMB2_MAX_BUFFER_SIZE));
3355 /* always an FSCTL (for now) */
3356 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3357
3358 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3359 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3360 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3361
3362 return 0;
3363 }
3364
3365 void
SMB2_ioctl_free(struct smb_rqst * rqst)3366 SMB2_ioctl_free(struct smb_rqst *rqst)
3367 {
3368 int i;
3369
3370 if (rqst && rqst->rq_iov) {
3371 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3372 for (i = 1; i < rqst->rq_nvec; i++)
3373 if (rqst->rq_iov[i].iov_base != smb2_padding)
3374 kfree(rqst->rq_iov[i].iov_base);
3375 }
3376 }
3377
3378
3379 /*
3380 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
3381 */
3382 int
SMB2_ioctl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 opcode,char * in_data,u32 indatalen,u32 max_out_data_len,char ** out_data,u32 * plen)3383 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3384 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3385 u32 max_out_data_len, char **out_data,
3386 u32 *plen /* returned data len */)
3387 {
3388 struct smb_rqst rqst;
3389 struct smb2_ioctl_rsp *rsp = NULL;
3390 struct cifs_ses *ses;
3391 struct TCP_Server_Info *server;
3392 struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3393 struct kvec rsp_iov = {NULL, 0};
3394 int resp_buftype = CIFS_NO_BUFFER;
3395 int rc = 0;
3396 int flags = 0;
3397 int retries = 0, cur_sleep = 1;
3398
3399 if (!tcon)
3400 return -EIO;
3401
3402 ses = tcon->ses;
3403 if (!ses)
3404 return -EIO;
3405
3406 replay_again:
3407 /* reinitialize for possible replay */
3408 flags = 0;
3409 server = cifs_pick_channel(ses);
3410
3411 if (!server)
3412 return -EIO;
3413
3414 cifs_dbg(FYI, "SMB2 IOCTL\n");
3415
3416 if (out_data != NULL)
3417 *out_data = NULL;
3418
3419 /* zero out returned data len, in case of error */
3420 if (plen)
3421 *plen = 0;
3422
3423 if (smb3_encryption_required(tcon))
3424 flags |= CIFS_TRANSFORM_REQ;
3425
3426 memset(&rqst, 0, sizeof(struct smb_rqst));
3427 memset(&iov, 0, sizeof(iov));
3428 rqst.rq_iov = iov;
3429 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3430
3431 rc = SMB2_ioctl_init(tcon, server,
3432 &rqst, persistent_fid, volatile_fid, opcode,
3433 in_data, indatalen, max_out_data_len);
3434 if (rc)
3435 goto ioctl_exit;
3436
3437 if (retries)
3438 smb2_set_replay(server, &rqst);
3439
3440 rc = cifs_send_recv(xid, ses, server,
3441 &rqst, &resp_buftype, flags,
3442 &rsp_iov);
3443 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3444
3445 if (rc != 0)
3446 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3447 ses->Suid, 0, opcode, rc);
3448
3449 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3450 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3451 goto ioctl_exit;
3452 } else if (rc == -EINVAL) {
3453 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3454 (opcode != FSCTL_SRV_COPYCHUNK)) {
3455 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3456 goto ioctl_exit;
3457 }
3458 } else if (rc == -E2BIG) {
3459 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3460 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3461 goto ioctl_exit;
3462 }
3463 }
3464
3465 /* check if caller wants to look at return data or just return rc */
3466 if ((plen == NULL) || (out_data == NULL))
3467 goto ioctl_exit;
3468
3469 /*
3470 * Although unlikely to be possible for rsp to be null and rc not set,
3471 * adding check below is slightly safer long term (and quiets Coverity
3472 * warning)
3473 */
3474 if (rsp == NULL) {
3475 rc = -EIO;
3476 goto ioctl_exit;
3477 }
3478
3479 *plen = le32_to_cpu(rsp->OutputCount);
3480
3481 /* We check for obvious errors in the output buffer length and offset */
3482 if (*plen == 0)
3483 goto ioctl_exit; /* server returned no data */
3484 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3485 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3486 *plen = 0;
3487 rc = -EIO;
3488 goto ioctl_exit;
3489 }
3490
3491 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3492 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3493 le32_to_cpu(rsp->OutputOffset));
3494 *plen = 0;
3495 rc = -EIO;
3496 goto ioctl_exit;
3497 }
3498
3499 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3500 *plen, GFP_KERNEL);
3501 if (*out_data == NULL) {
3502 rc = -ENOMEM;
3503 goto ioctl_exit;
3504 }
3505
3506 ioctl_exit:
3507 SMB2_ioctl_free(&rqst);
3508 free_rsp_buf(resp_buftype, rsp);
3509
3510 if (is_replayable_error(rc) &&
3511 smb2_should_replay(tcon, &retries, &cur_sleep))
3512 goto replay_again;
3513
3514 return rc;
3515 }
3516
3517 /*
3518 * Individual callers to ioctl worker function follow
3519 */
3520
3521 int
SMB2_set_compression(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3522 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3523 u64 persistent_fid, u64 volatile_fid)
3524 {
3525 int rc;
3526 struct compress_ioctl fsctl_input;
3527 char *ret_data = NULL;
3528
3529 fsctl_input.CompressionState =
3530 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3531
3532 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3533 FSCTL_SET_COMPRESSION,
3534 (char *)&fsctl_input /* data input */,
3535 2 /* in data len */, CIFSMaxBufSize /* max out data */,
3536 &ret_data /* out data */, NULL);
3537
3538 cifs_dbg(FYI, "set compression rc %d\n", rc);
3539
3540 return rc;
3541 }
3542
3543 int
SMB2_close_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,bool query_attrs)3544 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3545 struct smb_rqst *rqst,
3546 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3547 {
3548 struct smb2_close_req *req;
3549 struct kvec *iov = rqst->rq_iov;
3550 unsigned int total_len;
3551 int rc;
3552
3553 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3554 (void **) &req, &total_len);
3555 if (rc)
3556 return rc;
3557
3558 req->PersistentFileId = persistent_fid;
3559 req->VolatileFileId = volatile_fid;
3560 if (query_attrs)
3561 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3562 else
3563 req->Flags = 0;
3564 iov[0].iov_base = (char *)req;
3565 iov[0].iov_len = total_len;
3566
3567 return 0;
3568 }
3569
3570 void
SMB2_close_free(struct smb_rqst * rqst)3571 SMB2_close_free(struct smb_rqst *rqst)
3572 {
3573 if (rqst && rqst->rq_iov)
3574 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3575 }
3576
3577 int
__SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_network_open_info * pbuf)3578 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3579 u64 persistent_fid, u64 volatile_fid,
3580 struct smb2_file_network_open_info *pbuf)
3581 {
3582 struct smb_rqst rqst;
3583 struct smb2_close_rsp *rsp = NULL;
3584 struct cifs_ses *ses = tcon->ses;
3585 struct TCP_Server_Info *server;
3586 struct kvec iov[1];
3587 struct kvec rsp_iov;
3588 int resp_buftype = CIFS_NO_BUFFER;
3589 int rc = 0;
3590 int flags = 0;
3591 bool query_attrs = false;
3592 int retries = 0, cur_sleep = 1;
3593
3594 replay_again:
3595 /* reinitialize for possible replay */
3596 flags = 0;
3597 query_attrs = false;
3598 server = cifs_pick_channel(ses);
3599
3600 cifs_dbg(FYI, "Close\n");
3601
3602 if (!ses || !server)
3603 return -EIO;
3604
3605 if (smb3_encryption_required(tcon))
3606 flags |= CIFS_TRANSFORM_REQ;
3607
3608 memset(&rqst, 0, sizeof(struct smb_rqst));
3609 memset(&iov, 0, sizeof(iov));
3610 rqst.rq_iov = iov;
3611 rqst.rq_nvec = 1;
3612
3613 /* check if need to ask server to return timestamps in close response */
3614 if (pbuf)
3615 query_attrs = true;
3616
3617 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3618 rc = SMB2_close_init(tcon, server,
3619 &rqst, persistent_fid, volatile_fid,
3620 query_attrs);
3621 if (rc)
3622 goto close_exit;
3623
3624 if (retries)
3625 smb2_set_replay(server, &rqst);
3626
3627 rc = cifs_send_recv(xid, ses, server,
3628 &rqst, &resp_buftype, flags, &rsp_iov);
3629 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3630
3631 if (rc != 0) {
3632 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3633 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3634 rc);
3635 goto close_exit;
3636 } else {
3637 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3638 ses->Suid);
3639 if (pbuf)
3640 memcpy(&pbuf->network_open_info,
3641 &rsp->network_open_info,
3642 sizeof(pbuf->network_open_info));
3643 atomic_dec(&tcon->num_remote_opens);
3644 }
3645
3646 close_exit:
3647 SMB2_close_free(&rqst);
3648 free_rsp_buf(resp_buftype, rsp);
3649
3650 /* retry close in a worker thread if this one is interrupted */
3651 if (is_interrupt_error(rc)) {
3652 int tmp_rc;
3653
3654 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3655 volatile_fid);
3656 if (tmp_rc)
3657 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3658 persistent_fid, tmp_rc);
3659 }
3660
3661 if (is_replayable_error(rc) &&
3662 smb2_should_replay(tcon, &retries, &cur_sleep))
3663 goto replay_again;
3664
3665 return rc;
3666 }
3667
3668 int
SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3669 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3670 u64 persistent_fid, u64 volatile_fid)
3671 {
3672 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3673 }
3674
3675 int
smb2_validate_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int min_buf_size)3676 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3677 struct kvec *iov, unsigned int min_buf_size)
3678 {
3679 unsigned int smb_len = iov->iov_len;
3680 char *end_of_smb = smb_len + (char *)iov->iov_base;
3681 char *begin_of_buf = offset + (char *)iov->iov_base;
3682 char *end_of_buf = begin_of_buf + buffer_length;
3683
3684
3685 if (buffer_length < min_buf_size) {
3686 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3687 buffer_length, min_buf_size);
3688 return -EINVAL;
3689 }
3690
3691 /* check if beyond RFC1001 maximum length */
3692 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3693 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3694 buffer_length, smb_len);
3695 return -EINVAL;
3696 }
3697
3698 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3699 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3700 return -EINVAL;
3701 }
3702
3703 return 0;
3704 }
3705
3706 /*
3707 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3708 * Caller must free buffer.
3709 */
3710 int
smb2_validate_and_copy_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int minbufsize,char * data)3711 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3712 struct kvec *iov, unsigned int minbufsize,
3713 char *data)
3714 {
3715 char *begin_of_buf = offset + (char *)iov->iov_base;
3716 int rc;
3717
3718 if (!data)
3719 return -EINVAL;
3720
3721 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3722 if (rc)
3723 return rc;
3724
3725 memcpy(data, begin_of_buf, minbufsize);
3726
3727 return 0;
3728 }
3729
3730 int
SMB2_query_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t input_len,void * input)3731 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3732 struct smb_rqst *rqst,
3733 u64 persistent_fid, u64 volatile_fid,
3734 u8 info_class, u8 info_type, u32 additional_info,
3735 size_t output_len, size_t input_len, void *input)
3736 {
3737 struct smb2_query_info_req *req;
3738 struct kvec *iov = rqst->rq_iov;
3739 unsigned int total_len;
3740 size_t len;
3741 int rc;
3742
3743 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3744 len > CIFSMaxBufSize))
3745 return -EINVAL;
3746
3747 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3748 (void **) &req, &total_len);
3749 if (rc)
3750 return rc;
3751
3752 req->InfoType = info_type;
3753 req->FileInfoClass = info_class;
3754 req->PersistentFileId = persistent_fid;
3755 req->VolatileFileId = volatile_fid;
3756 req->AdditionalInformation = cpu_to_le32(additional_info);
3757
3758 req->OutputBufferLength = cpu_to_le32(output_len);
3759 if (input_len) {
3760 req->InputBufferLength = cpu_to_le32(input_len);
3761 /* total_len for smb query request never close to le16 max */
3762 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3763 memcpy(req->Buffer, input, input_len);
3764 }
3765
3766 iov[0].iov_base = (char *)req;
3767 /* 1 for Buffer */
3768 iov[0].iov_len = len;
3769 return 0;
3770 }
3771
3772 void
SMB2_query_info_free(struct smb_rqst * rqst)3773 SMB2_query_info_free(struct smb_rqst *rqst)
3774 {
3775 if (rqst && rqst->rq_iov)
3776 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3777 }
3778
3779 static int
query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t min_len,void ** data,u32 * dlen)3780 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3781 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3782 u32 additional_info, size_t output_len, size_t min_len, void **data,
3783 u32 *dlen)
3784 {
3785 struct smb_rqst rqst;
3786 struct smb2_query_info_rsp *rsp = NULL;
3787 struct kvec iov[1];
3788 struct kvec rsp_iov;
3789 int rc = 0;
3790 int resp_buftype = CIFS_NO_BUFFER;
3791 struct cifs_ses *ses = tcon->ses;
3792 struct TCP_Server_Info *server;
3793 int flags = 0;
3794 bool allocated = false;
3795 int retries = 0, cur_sleep = 1;
3796
3797 cifs_dbg(FYI, "Query Info\n");
3798
3799 if (!ses)
3800 return -EIO;
3801
3802 replay_again:
3803 /* reinitialize for possible replay */
3804 flags = 0;
3805 allocated = false;
3806 server = cifs_pick_channel(ses);
3807
3808 if (!server)
3809 return -EIO;
3810
3811 if (smb3_encryption_required(tcon))
3812 flags |= CIFS_TRANSFORM_REQ;
3813
3814 memset(&rqst, 0, sizeof(struct smb_rqst));
3815 memset(&iov, 0, sizeof(iov));
3816 rqst.rq_iov = iov;
3817 rqst.rq_nvec = 1;
3818
3819 rc = SMB2_query_info_init(tcon, server,
3820 &rqst, persistent_fid, volatile_fid,
3821 info_class, info_type, additional_info,
3822 output_len, 0, NULL);
3823 if (rc)
3824 goto qinf_exit;
3825
3826 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3827 ses->Suid, info_class, (__u32)info_type);
3828
3829 if (retries)
3830 smb2_set_replay(server, &rqst);
3831
3832 rc = cifs_send_recv(xid, ses, server,
3833 &rqst, &resp_buftype, flags, &rsp_iov);
3834 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3835
3836 if (rc) {
3837 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3838 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3839 ses->Suid, info_class, (__u32)info_type, rc);
3840 goto qinf_exit;
3841 }
3842
3843 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3844 ses->Suid, info_class, (__u32)info_type);
3845
3846 if (dlen) {
3847 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3848 if (!*data) {
3849 *data = kmalloc(*dlen, GFP_KERNEL);
3850 if (!*data) {
3851 cifs_tcon_dbg(VFS,
3852 "Error %d allocating memory for acl\n",
3853 rc);
3854 *dlen = 0;
3855 rc = -ENOMEM;
3856 goto qinf_exit;
3857 }
3858 allocated = true;
3859 }
3860 }
3861
3862 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3863 le32_to_cpu(rsp->OutputBufferLength),
3864 &rsp_iov, dlen ? *dlen : min_len, *data);
3865 if (rc && allocated) {
3866 kfree(*data);
3867 *data = NULL;
3868 *dlen = 0;
3869 }
3870
3871 qinf_exit:
3872 SMB2_query_info_free(&rqst);
3873 free_rsp_buf(resp_buftype, rsp);
3874
3875 if (is_replayable_error(rc) &&
3876 smb2_should_replay(tcon, &retries, &cur_sleep))
3877 goto replay_again;
3878
3879 return rc;
3880 }
3881
SMB2_query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_all_info * data)3882 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3883 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3884 {
3885 return query_info(xid, tcon, persistent_fid, volatile_fid,
3886 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3887 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3888 sizeof(struct smb2_file_all_info), (void **)&data,
3889 NULL);
3890 }
3891
3892 #if 0
3893 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3894 int
3895 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3896 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3897 {
3898 size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3899 (sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);
3900 *plen = 0;
3901
3902 return query_info(xid, tcon, persistent_fid, volatile_fid,
3903 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3904 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3905 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3906 }
3907 #endif
3908
3909 int
SMB2_query_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,void ** data,u32 * plen,u32 extra_info)3910 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3911 u64 persistent_fid, u64 volatile_fid,
3912 void **data, u32 *plen, u32 extra_info)
3913 {
3914 *plen = 0;
3915
3916 return query_info(xid, tcon, persistent_fid, volatile_fid,
3917 0, SMB2_O_INFO_SECURITY, extra_info,
3918 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3919 }
3920
3921 int
SMB2_get_srv_num(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le64 * uniqueid)3922 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3923 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3924 {
3925 return query_info(xid, tcon, persistent_fid, volatile_fid,
3926 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3927 sizeof(struct smb2_file_internal_info),
3928 sizeof(struct smb2_file_internal_info),
3929 (void **)&uniqueid, NULL);
3930 }
3931
3932 /*
3933 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3934 * See MS-SMB2 2.2.35 and 2.2.36
3935 */
3936
3937 static int
SMB2_notify_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid,u32 completion_filter,bool watch_tree)3938 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3939 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3940 u64 persistent_fid, u64 volatile_fid,
3941 u32 completion_filter, bool watch_tree)
3942 {
3943 struct smb2_change_notify_req *req;
3944 struct kvec *iov = rqst->rq_iov;
3945 unsigned int total_len;
3946 int rc;
3947
3948 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3949 (void **) &req, &total_len);
3950 if (rc)
3951 return rc;
3952
3953 req->PersistentFileId = persistent_fid;
3954 req->VolatileFileId = volatile_fid;
3955 /* See note 354 of MS-SMB2, 64K max */
3956 req->OutputBufferLength =
3957 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3958 req->CompletionFilter = cpu_to_le32(completion_filter);
3959 if (watch_tree)
3960 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3961 else
3962 req->Flags = 0;
3963
3964 iov[0].iov_base = (char *)req;
3965 iov[0].iov_len = total_len;
3966
3967 return 0;
3968 }
3969
3970 int
SMB2_change_notify(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,bool watch_tree,u32 completion_filter,u32 max_out_data_len,char ** out_data,u32 * plen)3971 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3972 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3973 u32 completion_filter, u32 max_out_data_len, char **out_data,
3974 u32 *plen /* returned data len */)
3975 {
3976 struct cifs_ses *ses = tcon->ses;
3977 struct TCP_Server_Info *server;
3978 struct smb_rqst rqst;
3979 struct smb2_change_notify_rsp *smb_rsp;
3980 struct kvec iov[1];
3981 struct kvec rsp_iov = {NULL, 0};
3982 int resp_buftype = CIFS_NO_BUFFER;
3983 int flags = 0;
3984 int rc = 0;
3985 int retries = 0, cur_sleep = 1;
3986
3987 replay_again:
3988 /* reinitialize for possible replay */
3989 flags = 0;
3990 server = cifs_pick_channel(ses);
3991
3992 cifs_dbg(FYI, "change notify\n");
3993 if (!ses || !server)
3994 return -EIO;
3995
3996 if (smb3_encryption_required(tcon))
3997 flags |= CIFS_TRANSFORM_REQ;
3998
3999 memset(&rqst, 0, sizeof(struct smb_rqst));
4000 memset(&iov, 0, sizeof(iov));
4001 if (plen)
4002 *plen = 0;
4003
4004 rqst.rq_iov = iov;
4005 rqst.rq_nvec = 1;
4006
4007 rc = SMB2_notify_init(xid, &rqst, tcon, server,
4008 persistent_fid, volatile_fid,
4009 completion_filter, watch_tree);
4010 if (rc)
4011 goto cnotify_exit;
4012
4013 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4014 (u8)watch_tree, completion_filter);
4015
4016 if (retries)
4017 smb2_set_replay(server, &rqst);
4018
4019 rc = cifs_send_recv(xid, ses, server,
4020 &rqst, &resp_buftype, flags, &rsp_iov);
4021
4022 if (rc != 0) {
4023 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4024 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4025 (u8)watch_tree, completion_filter, rc);
4026 } else {
4027 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4028 ses->Suid, (u8)watch_tree, completion_filter);
4029 /* validate that notify information is plausible */
4030 if ((rsp_iov.iov_base == NULL) ||
4031 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4032 goto cnotify_exit;
4033
4034 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4035
4036 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4037 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4038 sizeof(struct file_notify_information));
4039
4040 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4041 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4042 if (*out_data == NULL) {
4043 rc = -ENOMEM;
4044 goto cnotify_exit;
4045 } else if (plen)
4046 *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4047 }
4048
4049 cnotify_exit:
4050 if (rqst.rq_iov)
4051 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4052 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4053
4054 if (is_replayable_error(rc) &&
4055 smb2_should_replay(tcon, &retries, &cur_sleep))
4056 goto replay_again;
4057
4058 return rc;
4059 }
4060
4061
4062
4063 /*
4064 * This is a no-op for now. We're not really interested in the reply, but
4065 * rather in the fact that the server sent one and that server->lstrp
4066 * gets updated.
4067 *
4068 * FIXME: maybe we should consider checking that the reply matches request?
4069 */
4070 static void
smb2_echo_callback(struct mid_q_entry * mid)4071 smb2_echo_callback(struct mid_q_entry *mid)
4072 {
4073 struct TCP_Server_Info *server = mid->callback_data;
4074 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4075 struct cifs_credits credits = { .value = 0, .instance = 0 };
4076
4077 if (mid->mid_state == MID_RESPONSE_RECEIVED
4078 || mid->mid_state == MID_RESPONSE_MALFORMED) {
4079 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4080 credits.instance = server->reconnect_instance;
4081 }
4082
4083 release_mid(mid);
4084 add_credits(server, &credits, CIFS_ECHO_OP);
4085 }
4086
cifs_renegotiate_iosize(struct TCP_Server_Info * server,struct cifs_tcon * tcon)4087 static void cifs_renegotiate_iosize(struct TCP_Server_Info *server,
4088 struct cifs_tcon *tcon)
4089 {
4090 struct cifs_sb_info *cifs_sb;
4091
4092 if (server == NULL || tcon == NULL)
4093 return;
4094
4095 spin_lock(&tcon->sb_list_lock);
4096 list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link)
4097 cifs_negotiate_iosize(server, cifs_sb->ctx, tcon);
4098 spin_unlock(&tcon->sb_list_lock);
4099 }
4100
smb2_reconnect_server(struct work_struct * work)4101 void smb2_reconnect_server(struct work_struct *work)
4102 {
4103 struct TCP_Server_Info *server = container_of(work,
4104 struct TCP_Server_Info, reconnect.work);
4105 struct TCP_Server_Info *pserver;
4106 struct cifs_ses *ses, *ses2;
4107 struct cifs_tcon *tcon, *tcon2;
4108 struct list_head tmp_list, tmp_ses_list;
4109 bool ses_exist = false;
4110 bool tcon_selected = false;
4111 int rc;
4112 bool resched = false;
4113
4114 /* first check if ref count has reached 0, if not inc ref count */
4115 spin_lock(&cifs_tcp_ses_lock);
4116 if (!server->srv_count) {
4117 spin_unlock(&cifs_tcp_ses_lock);
4118 return;
4119 }
4120 server->srv_count++;
4121 spin_unlock(&cifs_tcp_ses_lock);
4122
4123 /* If server is a channel, select the primary channel */
4124 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4125
4126 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4127 mutex_lock(&pserver->reconnect_mutex);
4128
4129 /* if the server is marked for termination, drop the ref count here */
4130 if (server->terminate) {
4131 cifs_put_tcp_session(server, true);
4132 mutex_unlock(&pserver->reconnect_mutex);
4133 return;
4134 }
4135
4136 INIT_LIST_HEAD(&tmp_list);
4137 INIT_LIST_HEAD(&tmp_ses_list);
4138 cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4139
4140 spin_lock(&cifs_tcp_ses_lock);
4141 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4142 spin_lock(&ses->ses_lock);
4143 if (ses->ses_status == SES_EXITING) {
4144 spin_unlock(&ses->ses_lock);
4145 continue;
4146 }
4147 spin_unlock(&ses->ses_lock);
4148
4149 tcon_selected = false;
4150
4151 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4152 if (tcon->need_reconnect || tcon->need_reopen_files) {
4153 tcon->tc_count++;
4154 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4155 netfs_trace_tcon_ref_get_reconnect_server);
4156 list_add_tail(&tcon->rlist, &tmp_list);
4157 tcon_selected = true;
4158 }
4159 }
4160 /*
4161 * IPC has the same lifetime as its session and uses its
4162 * refcount.
4163 */
4164 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4165 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4166 tcon_selected = true;
4167 cifs_smb_ses_inc_refcount(ses);
4168 }
4169 /*
4170 * handle the case where channel needs to reconnect
4171 * binding session, but tcon is healthy (some other channel
4172 * is active)
4173 */
4174 spin_lock(&ses->chan_lock);
4175 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4176 list_add_tail(&ses->rlist, &tmp_ses_list);
4177 ses_exist = true;
4178 cifs_smb_ses_inc_refcount(ses);
4179 }
4180 spin_unlock(&ses->chan_lock);
4181 }
4182 spin_unlock(&cifs_tcp_ses_lock);
4183
4184 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4185 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4186 if (!rc) {
4187 cifs_renegotiate_iosize(server, tcon);
4188 cifs_reopen_persistent_handles(tcon);
4189 } else
4190 resched = true;
4191 list_del_init(&tcon->rlist);
4192 if (tcon->ipc)
4193 cifs_put_smb_ses(tcon->ses);
4194 else
4195 cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4196 }
4197
4198 if (!ses_exist)
4199 goto done;
4200
4201 /* allocate a dummy tcon struct used for reconnect */
4202 tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4203 if (!tcon) {
4204 resched = true;
4205 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4206 list_del_init(&ses->rlist);
4207 cifs_put_smb_ses(ses);
4208 }
4209 goto done;
4210 }
4211
4212 tcon->status = TID_GOOD;
4213 tcon->retry = false;
4214 tcon->need_reconnect = false;
4215
4216 /* now reconnect sessions for necessary channels */
4217 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4218 tcon->ses = ses;
4219 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4220 if (rc)
4221 resched = true;
4222 list_del_init(&ses->rlist);
4223 cifs_put_smb_ses(ses);
4224 }
4225 tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4226
4227 done:
4228 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4229 if (resched)
4230 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4231 mutex_unlock(&pserver->reconnect_mutex);
4232
4233 /* now we can safely release srv struct */
4234 cifs_put_tcp_session(server, true);
4235 }
4236
4237 int
SMB2_echo(struct TCP_Server_Info * server)4238 SMB2_echo(struct TCP_Server_Info *server)
4239 {
4240 struct smb2_echo_req *req;
4241 int rc = 0;
4242 struct kvec iov[1];
4243 struct smb_rqst rqst = { .rq_iov = iov,
4244 .rq_nvec = 1 };
4245 unsigned int total_len;
4246
4247 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4248
4249 spin_lock(&server->srv_lock);
4250 if (server->ops->need_neg &&
4251 server->ops->need_neg(server)) {
4252 spin_unlock(&server->srv_lock);
4253 /* No need to send echo on newly established connections */
4254 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4255 return rc;
4256 }
4257 spin_unlock(&server->srv_lock);
4258
4259 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4260 (void **)&req, &total_len);
4261 if (rc)
4262 return rc;
4263
4264 req->hdr.CreditRequest = cpu_to_le16(1);
4265
4266 iov[0].iov_len = total_len;
4267 iov[0].iov_base = (char *)req;
4268
4269 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4270 server, CIFS_ECHO_OP, NULL);
4271 if (rc)
4272 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4273
4274 cifs_small_buf_release(req);
4275 return rc;
4276 }
4277
4278 void
SMB2_flush_free(struct smb_rqst * rqst)4279 SMB2_flush_free(struct smb_rqst *rqst)
4280 {
4281 if (rqst && rqst->rq_iov)
4282 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4283 }
4284
4285 int
SMB2_flush_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid)4286 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4287 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4288 u64 persistent_fid, u64 volatile_fid)
4289 {
4290 struct smb2_flush_req *req;
4291 struct kvec *iov = rqst->rq_iov;
4292 unsigned int total_len;
4293 int rc;
4294
4295 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4296 (void **) &req, &total_len);
4297 if (rc)
4298 return rc;
4299
4300 req->PersistentFileId = persistent_fid;
4301 req->VolatileFileId = volatile_fid;
4302
4303 iov[0].iov_base = (char *)req;
4304 iov[0].iov_len = total_len;
4305
4306 return 0;
4307 }
4308
4309 int
SMB2_flush(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)4310 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4311 u64 volatile_fid)
4312 {
4313 struct cifs_ses *ses = tcon->ses;
4314 struct smb_rqst rqst;
4315 struct kvec iov[1];
4316 struct kvec rsp_iov = {NULL, 0};
4317 struct TCP_Server_Info *server;
4318 int resp_buftype = CIFS_NO_BUFFER;
4319 int flags = 0;
4320 int rc = 0;
4321 int retries = 0, cur_sleep = 1;
4322
4323 replay_again:
4324 /* reinitialize for possible replay */
4325 flags = 0;
4326 server = cifs_pick_channel(ses);
4327
4328 cifs_dbg(FYI, "flush\n");
4329 if (!ses || !(ses->server))
4330 return -EIO;
4331
4332 if (smb3_encryption_required(tcon))
4333 flags |= CIFS_TRANSFORM_REQ;
4334
4335 memset(&rqst, 0, sizeof(struct smb_rqst));
4336 memset(&iov, 0, sizeof(iov));
4337 rqst.rq_iov = iov;
4338 rqst.rq_nvec = 1;
4339
4340 rc = SMB2_flush_init(xid, &rqst, tcon, server,
4341 persistent_fid, volatile_fid);
4342 if (rc)
4343 goto flush_exit;
4344
4345 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4346
4347 if (retries)
4348 smb2_set_replay(server, &rqst);
4349
4350 rc = cifs_send_recv(xid, ses, server,
4351 &rqst, &resp_buftype, flags, &rsp_iov);
4352
4353 if (rc != 0) {
4354 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4355 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4356 rc);
4357 } else
4358 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4359 ses->Suid);
4360
4361 flush_exit:
4362 SMB2_flush_free(&rqst);
4363 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4364
4365 if (is_replayable_error(rc) &&
4366 smb2_should_replay(tcon, &retries, &cur_sleep))
4367 goto replay_again;
4368
4369 return rc;
4370 }
4371
4372 #ifdef CONFIG_CIFS_SMB_DIRECT
smb3_use_rdma_offload(struct cifs_io_parms * io_parms)4373 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4374 {
4375 struct TCP_Server_Info *server = io_parms->server;
4376 struct cifs_tcon *tcon = io_parms->tcon;
4377
4378 /* we can only offload if we're connected */
4379 if (!server || !tcon)
4380 return false;
4381
4382 /* we can only offload on an rdma connection */
4383 if (!server->rdma || !server->smbd_conn)
4384 return false;
4385
4386 /* we don't support signed offload yet */
4387 if (server->sign)
4388 return false;
4389
4390 /* we don't support encrypted offload yet */
4391 if (smb3_encryption_required(tcon))
4392 return false;
4393
4394 /* offload also has its overhead, so only do it if desired */
4395 if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4396 return false;
4397
4398 return true;
4399 }
4400 #endif /* CONFIG_CIFS_SMB_DIRECT */
4401
4402 /*
4403 * To form a chain of read requests, any read requests after the first should
4404 * have the end_of_chain boolean set to true.
4405 */
4406 static int
smb2_new_read_req(void ** buf,unsigned int * total_len,struct cifs_io_parms * io_parms,struct cifs_io_subrequest * rdata,unsigned int remaining_bytes,int request_type)4407 smb2_new_read_req(void **buf, unsigned int *total_len,
4408 struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4409 unsigned int remaining_bytes, int request_type)
4410 {
4411 int rc = -EACCES;
4412 struct smb2_read_req *req = NULL;
4413 struct smb2_hdr *shdr;
4414 struct TCP_Server_Info *server = io_parms->server;
4415
4416 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4417 (void **) &req, total_len);
4418 if (rc)
4419 return rc;
4420
4421 if (server == NULL)
4422 return -ECONNABORTED;
4423
4424 shdr = &req->hdr;
4425 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4426
4427 req->PersistentFileId = io_parms->persistent_fid;
4428 req->VolatileFileId = io_parms->volatile_fid;
4429 req->ReadChannelInfoOffset = 0; /* reserved */
4430 req->ReadChannelInfoLength = 0; /* reserved */
4431 req->Channel = 0; /* reserved */
4432 req->MinimumCount = 0;
4433 req->Length = cpu_to_le32(io_parms->length);
4434 req->Offset = cpu_to_le64(io_parms->offset);
4435
4436 trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4437 rdata ? rdata->subreq.debug_index : 0,
4438 rdata ? rdata->xid : 0,
4439 io_parms->persistent_fid,
4440 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4441 io_parms->offset, io_parms->length);
4442 #ifdef CONFIG_CIFS_SMB_DIRECT
4443 /*
4444 * If we want to do a RDMA write, fill in and append
4445 * smbd_buffer_descriptor_v1 to the end of read request
4446 */
4447 if (rdata && smb3_use_rdma_offload(io_parms)) {
4448 struct smbd_buffer_descriptor_v1 *v1;
4449 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4450
4451 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4452 true, need_invalidate);
4453 if (!rdata->mr)
4454 return -EAGAIN;
4455
4456 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4457 if (need_invalidate)
4458 req->Channel = SMB2_CHANNEL_RDMA_V1;
4459 req->ReadChannelInfoOffset =
4460 cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4461 req->ReadChannelInfoLength =
4462 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4463 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4464 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4465 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4466 v1->length = cpu_to_le32(rdata->mr->mr->length);
4467
4468 *total_len += sizeof(*v1) - 1;
4469 }
4470 #endif
4471 if (request_type & CHAINED_REQUEST) {
4472 if (!(request_type & END_OF_CHAIN)) {
4473 /* next 8-byte aligned request */
4474 *total_len = ALIGN(*total_len, 8);
4475 shdr->NextCommand = cpu_to_le32(*total_len);
4476 } else /* END_OF_CHAIN */
4477 shdr->NextCommand = 0;
4478 if (request_type & RELATED_REQUEST) {
4479 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4480 /*
4481 * Related requests use info from previous read request
4482 * in chain.
4483 */
4484 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4485 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4486 req->PersistentFileId = (u64)-1;
4487 req->VolatileFileId = (u64)-1;
4488 }
4489 }
4490 if (remaining_bytes > io_parms->length)
4491 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4492 else
4493 req->RemainingBytes = 0;
4494
4495 *buf = req;
4496 return rc;
4497 }
4498
4499 static void
smb2_readv_callback(struct mid_q_entry * mid)4500 smb2_readv_callback(struct mid_q_entry *mid)
4501 {
4502 struct cifs_io_subrequest *rdata = mid->callback_data;
4503 struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
4504 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4505 struct TCP_Server_Info *server = rdata->server;
4506 struct smb2_hdr *shdr =
4507 (struct smb2_hdr *)rdata->iov[0].iov_base;
4508 struct cifs_credits credits = {
4509 .value = 0,
4510 .instance = 0,
4511 .rreq_debug_id = rdata->rreq->debug_id,
4512 .rreq_debug_index = rdata->subreq.debug_index,
4513 };
4514 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4515 unsigned int rreq_debug_id = rdata->rreq->debug_id;
4516 unsigned int subreq_debug_index = rdata->subreq.debug_index;
4517
4518 if (rdata->got_bytes) {
4519 rqst.rq_iter = rdata->subreq.io_iter;
4520 }
4521
4522 WARN_ONCE(rdata->server != mid->server,
4523 "rdata server %p != mid server %p",
4524 rdata->server, mid->server);
4525
4526 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
4527 __func__, mid->mid, mid->mid_state, rdata->result,
4528 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
4529
4530 switch (mid->mid_state) {
4531 case MID_RESPONSE_RECEIVED:
4532 credits.value = le16_to_cpu(shdr->CreditRequest);
4533 credits.instance = server->reconnect_instance;
4534 /* result already set, check signature */
4535 if (server->sign && !mid->decrypted) {
4536 int rc;
4537
4538 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4539 rc = smb2_verify_signature(&rqst, server);
4540 if (rc)
4541 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4542 rc);
4543 }
4544 /* FIXME: should this be counted toward the initiating task? */
4545 task_io_account_read(rdata->got_bytes);
4546 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4547 break;
4548 case MID_REQUEST_SUBMITTED:
4549 case MID_RETRY_NEEDED:
4550 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
4551 rdata->result = -EAGAIN;
4552 if (server->sign && rdata->got_bytes)
4553 /* reset bytes number since we can not check a sign */
4554 rdata->got_bytes = 0;
4555 /* FIXME: should this be counted toward the initiating task? */
4556 task_io_account_read(rdata->got_bytes);
4557 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4558 break;
4559 case MID_RESPONSE_MALFORMED:
4560 credits.value = le16_to_cpu(shdr->CreditRequest);
4561 credits.instance = server->reconnect_instance;
4562 fallthrough;
4563 default:
4564 rdata->result = -EIO;
4565 }
4566 #ifdef CONFIG_CIFS_SMB_DIRECT
4567 /*
4568 * If this rdata has a memory registered, the MR can be freed
4569 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4570 * because they have limited number and are used for future I/Os
4571 */
4572 if (rdata->mr) {
4573 smbd_deregister_mr(rdata->mr);
4574 rdata->mr = NULL;
4575 }
4576 #endif
4577 if (rdata->result && rdata->result != -ENODATA) {
4578 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4579 trace_smb3_read_err(rdata->rreq->debug_id,
4580 rdata->subreq.debug_index,
4581 rdata->xid,
4582 rdata->req->cfile->fid.persistent_fid,
4583 tcon->tid, tcon->ses->Suid,
4584 rdata->subreq.start + rdata->subreq.transferred,
4585 rdata->subreq.len - rdata->subreq.transferred,
4586 rdata->result);
4587 } else
4588 trace_smb3_read_done(rdata->rreq->debug_id,
4589 rdata->subreq.debug_index,
4590 rdata->xid,
4591 rdata->req->cfile->fid.persistent_fid,
4592 tcon->tid, tcon->ses->Suid,
4593 rdata->subreq.start + rdata->subreq.transferred,
4594 rdata->got_bytes);
4595
4596 if (rdata->result == -ENODATA) {
4597 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4598 rdata->result = 0;
4599 } else {
4600 size_t trans = rdata->subreq.transferred + rdata->got_bytes;
4601 if (trans < rdata->subreq.len &&
4602 rdata->subreq.start + trans == ictx->remote_i_size) {
4603 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4604 rdata->result = 0;
4605 }
4606 if (rdata->got_bytes)
4607 __set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
4608 }
4609 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4610 server->credits, server->in_flight,
4611 0, cifs_trace_rw_credits_read_response_clear);
4612 rdata->credits.value = 0;
4613 rdata->subreq.error = rdata->result;
4614 rdata->subreq.transferred += rdata->got_bytes;
4615 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
4616 netfs_read_subreq_terminated(&rdata->subreq);
4617 release_mid(mid);
4618 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4619 server->credits, server->in_flight,
4620 credits.value, cifs_trace_rw_credits_read_response_add);
4621 add_credits(server, &credits, 0);
4622 }
4623
4624 /* smb2_async_readv - send an async read, and set up mid to handle result */
4625 int
smb2_async_readv(struct cifs_io_subrequest * rdata)4626 smb2_async_readv(struct cifs_io_subrequest *rdata)
4627 {
4628 int rc, flags = 0;
4629 char *buf;
4630 struct netfs_io_subrequest *subreq = &rdata->subreq;
4631 struct smb2_hdr *shdr;
4632 struct cifs_io_parms io_parms;
4633 struct smb_rqst rqst = { .rq_iov = rdata->iov,
4634 .rq_nvec = 1 };
4635 struct TCP_Server_Info *server;
4636 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4637 unsigned int total_len;
4638 int credit_request;
4639
4640 cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4641 __func__, subreq->start, subreq->len);
4642
4643 if (!rdata->server)
4644 rdata->server = cifs_pick_channel(tcon->ses);
4645
4646 io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4647 io_parms.server = server = rdata->server;
4648 io_parms.offset = subreq->start + subreq->transferred;
4649 io_parms.length = subreq->len - subreq->transferred;
4650 io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4651 io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4652 io_parms.pid = rdata->req->pid;
4653
4654 rc = smb2_new_read_req(
4655 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4656 if (rc)
4657 return rc;
4658
4659 if (smb3_encryption_required(io_parms.tcon))
4660 flags |= CIFS_TRANSFORM_REQ;
4661
4662 rdata->iov[0].iov_base = buf;
4663 rdata->iov[0].iov_len = total_len;
4664 rdata->got_bytes = 0;
4665 rdata->result = 0;
4666
4667 shdr = (struct smb2_hdr *)buf;
4668
4669 if (rdata->credits.value > 0) {
4670 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
4671 SMB2_MAX_BUFFER_SIZE));
4672 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4673 if (server->credits >= server->max_credits)
4674 shdr->CreditRequest = cpu_to_le16(0);
4675 else
4676 shdr->CreditRequest = cpu_to_le16(
4677 min_t(int, server->max_credits -
4678 server->credits, credit_request));
4679
4680 rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4681 if (rc)
4682 goto async_readv_out;
4683
4684 flags |= CIFS_HAS_CREDITS;
4685 }
4686
4687 rc = cifs_call_async(server, &rqst,
4688 cifs_readv_receive, smb2_readv_callback,
4689 smb3_handle_read_data, rdata, flags,
4690 &rdata->credits);
4691 if (rc) {
4692 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4693 trace_smb3_read_err(rdata->rreq->debug_id,
4694 subreq->debug_index,
4695 rdata->xid, io_parms.persistent_fid,
4696 io_parms.tcon->tid,
4697 io_parms.tcon->ses->Suid,
4698 io_parms.offset,
4699 subreq->len - subreq->transferred, rc);
4700 }
4701
4702 async_readv_out:
4703 cifs_small_buf_release(buf);
4704 return rc;
4705 }
4706
4707 int
SMB2_read(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,char ** buf,int * buf_type)4708 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4709 unsigned int *nbytes, char **buf, int *buf_type)
4710 {
4711 struct smb_rqst rqst;
4712 int resp_buftype, rc;
4713 struct smb2_read_req *req = NULL;
4714 struct smb2_read_rsp *rsp = NULL;
4715 struct kvec iov[1];
4716 struct kvec rsp_iov;
4717 unsigned int total_len;
4718 int flags = CIFS_LOG_ERROR;
4719 struct cifs_ses *ses = io_parms->tcon->ses;
4720
4721 if (!io_parms->server)
4722 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4723
4724 *nbytes = 0;
4725 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4726 if (rc)
4727 return rc;
4728
4729 if (smb3_encryption_required(io_parms->tcon))
4730 flags |= CIFS_TRANSFORM_REQ;
4731
4732 iov[0].iov_base = (char *)req;
4733 iov[0].iov_len = total_len;
4734
4735 memset(&rqst, 0, sizeof(struct smb_rqst));
4736 rqst.rq_iov = iov;
4737 rqst.rq_nvec = 1;
4738
4739 rc = cifs_send_recv(xid, ses, io_parms->server,
4740 &rqst, &resp_buftype, flags, &rsp_iov);
4741 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4742
4743 if (rc) {
4744 if (rc != -ENODATA) {
4745 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4746 cifs_dbg(VFS, "Send error in read = %d\n", rc);
4747 trace_smb3_read_err(0, 0, xid,
4748 req->PersistentFileId,
4749 io_parms->tcon->tid, ses->Suid,
4750 io_parms->offset, io_parms->length,
4751 rc);
4752 } else
4753 trace_smb3_read_done(0, 0, xid,
4754 req->PersistentFileId, io_parms->tcon->tid,
4755 ses->Suid, io_parms->offset, 0);
4756 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4757 cifs_small_buf_release(req);
4758 return rc == -ENODATA ? 0 : rc;
4759 } else
4760 trace_smb3_read_done(0, 0, xid,
4761 req->PersistentFileId,
4762 io_parms->tcon->tid, ses->Suid,
4763 io_parms->offset, io_parms->length);
4764
4765 cifs_small_buf_release(req);
4766
4767 *nbytes = le32_to_cpu(rsp->DataLength);
4768 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4769 (*nbytes > io_parms->length)) {
4770 cifs_dbg(FYI, "bad length %d for count %d\n",
4771 *nbytes, io_parms->length);
4772 rc = -EIO;
4773 *nbytes = 0;
4774 }
4775
4776 if (*buf) {
4777 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4778 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4779 } else if (resp_buftype != CIFS_NO_BUFFER) {
4780 *buf = rsp_iov.iov_base;
4781 if (resp_buftype == CIFS_SMALL_BUFFER)
4782 *buf_type = CIFS_SMALL_BUFFER;
4783 else if (resp_buftype == CIFS_LARGE_BUFFER)
4784 *buf_type = CIFS_LARGE_BUFFER;
4785 }
4786 return rc;
4787 }
4788
4789 /*
4790 * Check the mid_state and signature on received buffer (if any), and queue the
4791 * workqueue completion task.
4792 */
4793 static void
smb2_writev_callback(struct mid_q_entry * mid)4794 smb2_writev_callback(struct mid_q_entry *mid)
4795 {
4796 struct cifs_io_subrequest *wdata = mid->callback_data;
4797 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4798 struct TCP_Server_Info *server = wdata->server;
4799 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4800 struct cifs_credits credits = {
4801 .value = 0,
4802 .instance = 0,
4803 .rreq_debug_id = wdata->rreq->debug_id,
4804 .rreq_debug_index = wdata->subreq.debug_index,
4805 };
4806 unsigned int rreq_debug_id = wdata->rreq->debug_id;
4807 unsigned int subreq_debug_index = wdata->subreq.debug_index;
4808 ssize_t result = 0;
4809 size_t written;
4810
4811 WARN_ONCE(wdata->server != mid->server,
4812 "wdata server %p != mid server %p",
4813 wdata->server, mid->server);
4814
4815 switch (mid->mid_state) {
4816 case MID_RESPONSE_RECEIVED:
4817 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4818 credits.instance = server->reconnect_instance;
4819 result = smb2_check_receive(mid, server, 0);
4820 if (result != 0)
4821 break;
4822
4823 written = le32_to_cpu(rsp->DataLength);
4824 /*
4825 * Mask off high 16 bits when bytes written as returned
4826 * by the server is greater than bytes requested by the
4827 * client. OS/2 servers are known to set incorrect
4828 * CountHigh values.
4829 */
4830 if (written > wdata->subreq.len)
4831 written &= 0xFFFF;
4832
4833 cifs_stats_bytes_written(tcon, written);
4834
4835 if (written < wdata->subreq.len) {
4836 wdata->result = -ENOSPC;
4837 } else if (written > 0) {
4838 wdata->subreq.len = written;
4839 __set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
4840 }
4841 break;
4842 case MID_REQUEST_SUBMITTED:
4843 case MID_RETRY_NEEDED:
4844 result = -EAGAIN;
4845 break;
4846 case MID_RESPONSE_MALFORMED:
4847 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4848 credits.instance = server->reconnect_instance;
4849 fallthrough;
4850 default:
4851 result = -EIO;
4852 break;
4853 }
4854 #ifdef CONFIG_CIFS_SMB_DIRECT
4855 /*
4856 * If this wdata has a memory registered, the MR can be freed
4857 * The number of MRs available is limited, it's important to recover
4858 * used MR as soon as I/O is finished. Hold MR longer in the later
4859 * I/O process can possibly result in I/O deadlock due to lack of MR
4860 * to send request on I/O retry
4861 */
4862 if (wdata->mr) {
4863 smbd_deregister_mr(wdata->mr);
4864 wdata->mr = NULL;
4865 }
4866 #endif
4867 if (result) {
4868 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4869 trace_smb3_write_err(wdata->rreq->debug_id,
4870 wdata->subreq.debug_index,
4871 wdata->xid,
4872 wdata->req->cfile->fid.persistent_fid,
4873 tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4874 wdata->subreq.len, wdata->result);
4875 if (wdata->result == -ENOSPC)
4876 pr_warn_once("Out of space writing to %s\n",
4877 tcon->tree_name);
4878 } else
4879 trace_smb3_write_done(wdata->rreq->debug_id,
4880 wdata->subreq.debug_index,
4881 wdata->xid,
4882 wdata->req->cfile->fid.persistent_fid,
4883 tcon->tid, tcon->ses->Suid,
4884 wdata->subreq.start, wdata->subreq.len);
4885
4886 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4887 server->credits, server->in_flight,
4888 0, cifs_trace_rw_credits_write_response_clear);
4889 wdata->credits.value = 0;
4890 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
4891 cifs_write_subrequest_terminated(wdata, result ?: written, true);
4892 release_mid(mid);
4893 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4894 server->credits, server->in_flight,
4895 credits.value, cifs_trace_rw_credits_write_response_add);
4896 add_credits(server, &credits, 0);
4897 }
4898
4899 /* smb2_async_writev - send an async write, and set up mid to handle result */
4900 void
smb2_async_writev(struct cifs_io_subrequest * wdata)4901 smb2_async_writev(struct cifs_io_subrequest *wdata)
4902 {
4903 int rc = -EACCES, flags = 0;
4904 struct smb2_write_req *req = NULL;
4905 struct smb2_hdr *shdr;
4906 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4907 struct TCP_Server_Info *server = wdata->server;
4908 struct kvec iov[1];
4909 struct smb_rqst rqst = { };
4910 unsigned int total_len, xid = wdata->xid;
4911 struct cifs_io_parms _io_parms;
4912 struct cifs_io_parms *io_parms = NULL;
4913 int credit_request;
4914
4915 /*
4916 * in future we may get cifs_io_parms passed in from the caller,
4917 * but for now we construct it here...
4918 */
4919 _io_parms = (struct cifs_io_parms) {
4920 .tcon = tcon,
4921 .server = server,
4922 .offset = wdata->subreq.start,
4923 .length = wdata->subreq.len,
4924 .persistent_fid = wdata->req->cfile->fid.persistent_fid,
4925 .volatile_fid = wdata->req->cfile->fid.volatile_fid,
4926 .pid = wdata->req->pid,
4927 };
4928 io_parms = &_io_parms;
4929
4930 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4931 (void **) &req, &total_len);
4932 if (rc)
4933 goto out;
4934
4935 rqst.rq_iov = iov;
4936 rqst.rq_iter = wdata->subreq.io_iter;
4937
4938 rqst.rq_iov[0].iov_len = total_len - 1;
4939 rqst.rq_iov[0].iov_base = (char *)req;
4940 rqst.rq_nvec += 1;
4941
4942 if (smb3_encryption_required(tcon))
4943 flags |= CIFS_TRANSFORM_REQ;
4944
4945 shdr = (struct smb2_hdr *)req;
4946 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4947
4948 req->PersistentFileId = io_parms->persistent_fid;
4949 req->VolatileFileId = io_parms->volatile_fid;
4950 req->WriteChannelInfoOffset = 0;
4951 req->WriteChannelInfoLength = 0;
4952 req->Channel = SMB2_CHANNEL_NONE;
4953 req->Length = cpu_to_le32(io_parms->length);
4954 req->Offset = cpu_to_le64(io_parms->offset);
4955 req->DataOffset = cpu_to_le16(
4956 offsetof(struct smb2_write_req, Buffer));
4957 req->RemainingBytes = 0;
4958
4959 trace_smb3_write_enter(wdata->rreq->debug_id,
4960 wdata->subreq.debug_index,
4961 wdata->xid,
4962 io_parms->persistent_fid,
4963 io_parms->tcon->tid,
4964 io_parms->tcon->ses->Suid,
4965 io_parms->offset,
4966 io_parms->length);
4967
4968 #ifdef CONFIG_CIFS_SMB_DIRECT
4969 /*
4970 * If we want to do a server RDMA read, fill in and append
4971 * smbd_buffer_descriptor_v1 to the end of write request
4972 */
4973 if (smb3_use_rdma_offload(io_parms)) {
4974 struct smbd_buffer_descriptor_v1 *v1;
4975 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4976
4977 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
4978 false, need_invalidate);
4979 if (!wdata->mr) {
4980 rc = -EAGAIN;
4981 goto async_writev_out;
4982 }
4983 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4984 req->RemainingBytes = req->Length;
4985 req->Length = 0;
4986 req->DataOffset = 0;
4987 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4988 if (need_invalidate)
4989 req->Channel = SMB2_CHANNEL_RDMA_V1;
4990 req->WriteChannelInfoOffset =
4991 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4992 req->WriteChannelInfoLength =
4993 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4994 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4995 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4996 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4997 v1->length = cpu_to_le32(wdata->mr->mr->length);
4998
4999 rqst.rq_iov[0].iov_len += sizeof(*v1);
5000
5001 /*
5002 * We keep wdata->subreq.io_iter,
5003 * but we have to truncate rqst.rq_iter
5004 */
5005 iov_iter_truncate(&rqst.rq_iter, 0);
5006 }
5007 #endif
5008
5009 if (wdata->subreq.retry_count > 0)
5010 smb2_set_replay(server, &rqst);
5011
5012 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
5013 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
5014
5015 if (wdata->credits.value > 0) {
5016 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
5017 SMB2_MAX_BUFFER_SIZE));
5018 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
5019 if (server->credits >= server->max_credits)
5020 shdr->CreditRequest = cpu_to_le16(0);
5021 else
5022 shdr->CreditRequest = cpu_to_le16(
5023 min_t(int, server->max_credits -
5024 server->credits, credit_request));
5025
5026 rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
5027 if (rc)
5028 goto async_writev_out;
5029
5030 flags |= CIFS_HAS_CREDITS;
5031 }
5032
5033 /* XXX: compression + encryption is unsupported for now */
5034 if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
5035 flags |= CIFS_COMPRESS_REQ;
5036
5037 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5038 wdata, flags, &wdata->credits);
5039 /* Can't touch wdata if rc == 0 */
5040 if (rc) {
5041 trace_smb3_write_err(wdata->rreq->debug_id,
5042 wdata->subreq.debug_index,
5043 xid,
5044 io_parms->persistent_fid,
5045 io_parms->tcon->tid,
5046 io_parms->tcon->ses->Suid,
5047 io_parms->offset,
5048 io_parms->length,
5049 rc);
5050 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5051 }
5052
5053 async_writev_out:
5054 cifs_small_buf_release(req);
5055 out:
5056 if (rc) {
5057 trace_smb3_rw_credits(wdata->rreq->debug_id,
5058 wdata->subreq.debug_index,
5059 wdata->credits.value,
5060 server->credits, server->in_flight,
5061 -(int)wdata->credits.value,
5062 cifs_trace_rw_credits_write_response_clear);
5063 add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5064 cifs_write_subrequest_terminated(wdata, rc, true);
5065 }
5066 }
5067
5068 /*
5069 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5070 * The length field from io_parms must be at least 1 and indicates a number of
5071 * elements with data to write that begins with position 1 in iov array. All
5072 * data length is specified by count.
5073 */
5074 int
SMB2_write(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,struct kvec * iov,int n_vec)5075 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5076 unsigned int *nbytes, struct kvec *iov, int n_vec)
5077 {
5078 struct smb_rqst rqst;
5079 int rc = 0;
5080 struct smb2_write_req *req = NULL;
5081 struct smb2_write_rsp *rsp = NULL;
5082 int resp_buftype;
5083 struct kvec rsp_iov;
5084 int flags = 0;
5085 unsigned int total_len;
5086 struct TCP_Server_Info *server;
5087 int retries = 0, cur_sleep = 1;
5088
5089 replay_again:
5090 /* reinitialize for possible replay */
5091 flags = 0;
5092 *nbytes = 0;
5093 if (!io_parms->server)
5094 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5095 server = io_parms->server;
5096 if (server == NULL)
5097 return -ECONNABORTED;
5098
5099 if (n_vec < 1)
5100 return rc;
5101
5102 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5103 (void **) &req, &total_len);
5104 if (rc)
5105 return rc;
5106
5107 if (smb3_encryption_required(io_parms->tcon))
5108 flags |= CIFS_TRANSFORM_REQ;
5109
5110 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5111
5112 req->PersistentFileId = io_parms->persistent_fid;
5113 req->VolatileFileId = io_parms->volatile_fid;
5114 req->WriteChannelInfoOffset = 0;
5115 req->WriteChannelInfoLength = 0;
5116 req->Channel = 0;
5117 req->Length = cpu_to_le32(io_parms->length);
5118 req->Offset = cpu_to_le64(io_parms->offset);
5119 req->DataOffset = cpu_to_le16(
5120 offsetof(struct smb2_write_req, Buffer));
5121 req->RemainingBytes = 0;
5122
5123 trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
5124 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5125 io_parms->offset, io_parms->length);
5126
5127 iov[0].iov_base = (char *)req;
5128 /* 1 for Buffer */
5129 iov[0].iov_len = total_len - 1;
5130
5131 memset(&rqst, 0, sizeof(struct smb_rqst));
5132 rqst.rq_iov = iov;
5133 rqst.rq_nvec = n_vec + 1;
5134
5135 if (retries)
5136 smb2_set_replay(server, &rqst);
5137
5138 rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5139 &rqst,
5140 &resp_buftype, flags, &rsp_iov);
5141 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5142
5143 if (rc) {
5144 trace_smb3_write_err(0, 0, xid,
5145 req->PersistentFileId,
5146 io_parms->tcon->tid,
5147 io_parms->tcon->ses->Suid,
5148 io_parms->offset, io_parms->length, rc);
5149 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5150 cifs_dbg(VFS, "Send error in write = %d\n", rc);
5151 } else {
5152 *nbytes = le32_to_cpu(rsp->DataLength);
5153 cifs_stats_bytes_written(io_parms->tcon, *nbytes);
5154 trace_smb3_write_done(0, 0, xid,
5155 req->PersistentFileId,
5156 io_parms->tcon->tid,
5157 io_parms->tcon->ses->Suid,
5158 io_parms->offset, *nbytes);
5159 }
5160
5161 cifs_small_buf_release(req);
5162 free_rsp_buf(resp_buftype, rsp);
5163
5164 if (is_replayable_error(rc) &&
5165 smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5166 goto replay_again;
5167
5168 return rc;
5169 }
5170
posix_info_sid_size(const void * beg,const void * end)5171 int posix_info_sid_size(const void *beg, const void *end)
5172 {
5173 size_t subauth;
5174 int total;
5175
5176 if (beg + 1 > end)
5177 return -1;
5178
5179 subauth = *(u8 *)(beg+1);
5180 if (subauth < 1 || subauth > 15)
5181 return -1;
5182
5183 total = 1 + 1 + 6 + 4*subauth;
5184 if (beg + total > end)
5185 return -1;
5186
5187 return total;
5188 }
5189
posix_info_parse(const void * beg,const void * end,struct smb2_posix_info_parsed * out)5190 int posix_info_parse(const void *beg, const void *end,
5191 struct smb2_posix_info_parsed *out)
5192
5193 {
5194 int total_len = 0;
5195 int owner_len, group_len;
5196 int name_len;
5197 const void *owner_sid;
5198 const void *group_sid;
5199 const void *name;
5200
5201 /* if no end bound given, assume payload to be correct */
5202 if (!end) {
5203 const struct smb2_posix_info *p = beg;
5204
5205 end = beg + le32_to_cpu(p->NextEntryOffset);
5206 /* last element will have a 0 offset, pick a sensible bound */
5207 if (end == beg)
5208 end += 0xFFFF;
5209 }
5210
5211 /* check base buf */
5212 if (beg + sizeof(struct smb2_posix_info) > end)
5213 return -1;
5214 total_len = sizeof(struct smb2_posix_info);
5215
5216 /* check owner sid */
5217 owner_sid = beg + total_len;
5218 owner_len = posix_info_sid_size(owner_sid, end);
5219 if (owner_len < 0)
5220 return -1;
5221 total_len += owner_len;
5222
5223 /* check group sid */
5224 group_sid = beg + total_len;
5225 group_len = posix_info_sid_size(group_sid, end);
5226 if (group_len < 0)
5227 return -1;
5228 total_len += group_len;
5229
5230 /* check name len */
5231 if (beg + total_len + 4 > end)
5232 return -1;
5233 name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5234 if (name_len < 1 || name_len > 0xFFFF)
5235 return -1;
5236 total_len += 4;
5237
5238 /* check name */
5239 name = beg + total_len;
5240 if (name + name_len > end)
5241 return -1;
5242 total_len += name_len;
5243
5244 if (out) {
5245 out->base = beg;
5246 out->size = total_len;
5247 out->name_len = name_len;
5248 out->name = name;
5249 memcpy(&out->owner, owner_sid, owner_len);
5250 memcpy(&out->group, group_sid, group_len);
5251 }
5252 return total_len;
5253 }
5254
posix_info_extra_size(const void * beg,const void * end)5255 static int posix_info_extra_size(const void *beg, const void *end)
5256 {
5257 int len = posix_info_parse(beg, end, NULL);
5258
5259 if (len < 0)
5260 return -1;
5261 return len - sizeof(struct smb2_posix_info);
5262 }
5263
5264 static unsigned int
num_entries(int infotype,char * bufstart,char * end_of_buf,char ** lastentry,size_t size)5265 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5266 size_t size)
5267 {
5268 int len;
5269 unsigned int entrycount = 0;
5270 unsigned int next_offset = 0;
5271 char *entryptr;
5272 FILE_DIRECTORY_INFO *dir_info;
5273
5274 if (bufstart == NULL)
5275 return 0;
5276
5277 entryptr = bufstart;
5278
5279 while (1) {
5280 if (entryptr + next_offset < entryptr ||
5281 entryptr + next_offset > end_of_buf ||
5282 entryptr + next_offset + size > end_of_buf) {
5283 cifs_dbg(VFS, "malformed search entry would overflow\n");
5284 break;
5285 }
5286
5287 entryptr = entryptr + next_offset;
5288 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5289
5290 if (infotype == SMB_FIND_FILE_POSIX_INFO)
5291 len = posix_info_extra_size(entryptr, end_of_buf);
5292 else
5293 len = le32_to_cpu(dir_info->FileNameLength);
5294
5295 if (len < 0 ||
5296 entryptr + len < entryptr ||
5297 entryptr + len > end_of_buf ||
5298 entryptr + len + size > end_of_buf) {
5299 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5300 end_of_buf);
5301 break;
5302 }
5303
5304 *lastentry = entryptr;
5305 entrycount++;
5306
5307 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5308 if (!next_offset)
5309 break;
5310 }
5311
5312 return entrycount;
5313 }
5314
5315 /*
5316 * Readdir/FindFirst
5317 */
SMB2_query_directory_init(const unsigned int xid,struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,int index,int info_level)5318 int SMB2_query_directory_init(const unsigned int xid,
5319 struct cifs_tcon *tcon,
5320 struct TCP_Server_Info *server,
5321 struct smb_rqst *rqst,
5322 u64 persistent_fid, u64 volatile_fid,
5323 int index, int info_level)
5324 {
5325 struct smb2_query_directory_req *req;
5326 unsigned char *bufptr;
5327 __le16 asteriks = cpu_to_le16('*');
5328 unsigned int output_size = CIFSMaxBufSize -
5329 MAX_SMB2_CREATE_RESPONSE_SIZE -
5330 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5331 unsigned int total_len;
5332 struct kvec *iov = rqst->rq_iov;
5333 int len, rc;
5334
5335 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5336 (void **) &req, &total_len);
5337 if (rc)
5338 return rc;
5339
5340 switch (info_level) {
5341 case SMB_FIND_FILE_DIRECTORY_INFO:
5342 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5343 break;
5344 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5345 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5346 break;
5347 case SMB_FIND_FILE_POSIX_INFO:
5348 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5349 break;
5350 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5351 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5352 break;
5353 default:
5354 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5355 info_level);
5356 return -EINVAL;
5357 }
5358
5359 req->FileIndex = cpu_to_le32(index);
5360 req->PersistentFileId = persistent_fid;
5361 req->VolatileFileId = volatile_fid;
5362
5363 len = 0x2;
5364 bufptr = req->Buffer;
5365 memcpy(bufptr, &asteriks, len);
5366
5367 req->FileNameOffset =
5368 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5369 req->FileNameLength = cpu_to_le16(len);
5370 /*
5371 * BB could be 30 bytes or so longer if we used SMB2 specific
5372 * buffer lengths, but this is safe and close enough.
5373 */
5374 output_size = min_t(unsigned int, output_size, server->maxBuf);
5375 output_size = min_t(unsigned int, output_size, 2 << 15);
5376 req->OutputBufferLength = cpu_to_le32(output_size);
5377
5378 iov[0].iov_base = (char *)req;
5379 /* 1 for Buffer */
5380 iov[0].iov_len = total_len - 1;
5381
5382 iov[1].iov_base = (char *)(req->Buffer);
5383 iov[1].iov_len = len;
5384
5385 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5386 tcon->ses->Suid, index, output_size);
5387
5388 return 0;
5389 }
5390
SMB2_query_directory_free(struct smb_rqst * rqst)5391 void SMB2_query_directory_free(struct smb_rqst *rqst)
5392 {
5393 if (rqst && rqst->rq_iov) {
5394 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5395 }
5396 }
5397
5398 int
smb2_parse_query_directory(struct cifs_tcon * tcon,struct kvec * rsp_iov,int resp_buftype,struct cifs_search_info * srch_inf)5399 smb2_parse_query_directory(struct cifs_tcon *tcon,
5400 struct kvec *rsp_iov,
5401 int resp_buftype,
5402 struct cifs_search_info *srch_inf)
5403 {
5404 struct smb2_query_directory_rsp *rsp;
5405 size_t info_buf_size;
5406 char *end_of_smb;
5407 int rc;
5408
5409 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5410
5411 switch (srch_inf->info_level) {
5412 case SMB_FIND_FILE_DIRECTORY_INFO:
5413 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5414 break;
5415 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5416 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5417 break;
5418 case SMB_FIND_FILE_POSIX_INFO:
5419 /* note that posix payload are variable size */
5420 info_buf_size = sizeof(struct smb2_posix_info);
5421 break;
5422 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5423 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5424 break;
5425 default:
5426 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5427 srch_inf->info_level);
5428 return -EINVAL;
5429 }
5430
5431 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5432 le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5433 info_buf_size);
5434 if (rc) {
5435 cifs_tcon_dbg(VFS, "bad info payload");
5436 return rc;
5437 }
5438
5439 srch_inf->unicode = true;
5440
5441 if (srch_inf->ntwrk_buf_start) {
5442 if (srch_inf->smallBuf)
5443 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5444 else
5445 cifs_buf_release(srch_inf->ntwrk_buf_start);
5446 }
5447 srch_inf->ntwrk_buf_start = (char *)rsp;
5448 srch_inf->srch_entries_start = srch_inf->last_entry =
5449 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5450 end_of_smb = rsp_iov->iov_len + (char *)rsp;
5451
5452 srch_inf->entries_in_buffer = num_entries(
5453 srch_inf->info_level,
5454 srch_inf->srch_entries_start,
5455 end_of_smb,
5456 &srch_inf->last_entry,
5457 info_buf_size);
5458
5459 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5460 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5461 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5462 srch_inf->srch_entries_start, srch_inf->last_entry);
5463 if (resp_buftype == CIFS_LARGE_BUFFER)
5464 srch_inf->smallBuf = false;
5465 else if (resp_buftype == CIFS_SMALL_BUFFER)
5466 srch_inf->smallBuf = true;
5467 else
5468 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5469
5470 return 0;
5471 }
5472
5473 int
SMB2_query_directory(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int index,struct cifs_search_info * srch_inf)5474 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5475 u64 persistent_fid, u64 volatile_fid, int index,
5476 struct cifs_search_info *srch_inf)
5477 {
5478 struct smb_rqst rqst;
5479 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5480 struct smb2_query_directory_rsp *rsp = NULL;
5481 int resp_buftype = CIFS_NO_BUFFER;
5482 struct kvec rsp_iov;
5483 int rc = 0;
5484 struct cifs_ses *ses = tcon->ses;
5485 struct TCP_Server_Info *server;
5486 int flags = 0;
5487 int retries = 0, cur_sleep = 1;
5488
5489 replay_again:
5490 /* reinitialize for possible replay */
5491 flags = 0;
5492 server = cifs_pick_channel(ses);
5493
5494 if (!ses || !(ses->server))
5495 return -EIO;
5496
5497 if (smb3_encryption_required(tcon))
5498 flags |= CIFS_TRANSFORM_REQ;
5499
5500 memset(&rqst, 0, sizeof(struct smb_rqst));
5501 memset(&iov, 0, sizeof(iov));
5502 rqst.rq_iov = iov;
5503 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5504
5505 rc = SMB2_query_directory_init(xid, tcon, server,
5506 &rqst, persistent_fid,
5507 volatile_fid, index,
5508 srch_inf->info_level);
5509 if (rc)
5510 goto qdir_exit;
5511
5512 if (retries)
5513 smb2_set_replay(server, &rqst);
5514
5515 rc = cifs_send_recv(xid, ses, server,
5516 &rqst, &resp_buftype, flags, &rsp_iov);
5517 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5518
5519 if (rc) {
5520 if (rc == -ENODATA &&
5521 rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5522 trace_smb3_query_dir_done(xid, persistent_fid,
5523 tcon->tid, tcon->ses->Suid, index, 0);
5524 srch_inf->endOfSearch = true;
5525 rc = 0;
5526 } else {
5527 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5528 tcon->ses->Suid, index, 0, rc);
5529 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5530 }
5531 goto qdir_exit;
5532 }
5533
5534 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5535 srch_inf);
5536 if (rc) {
5537 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5538 tcon->ses->Suid, index, 0, rc);
5539 goto qdir_exit;
5540 }
5541 resp_buftype = CIFS_NO_BUFFER;
5542
5543 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5544 tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5545
5546 qdir_exit:
5547 SMB2_query_directory_free(&rqst);
5548 free_rsp_buf(resp_buftype, rsp);
5549
5550 if (is_replayable_error(rc) &&
5551 smb2_should_replay(tcon, &retries, &cur_sleep))
5552 goto replay_again;
5553
5554 return rc;
5555 }
5556
5557 int
SMB2_set_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,void ** data,unsigned int * size)5558 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5559 struct smb_rqst *rqst,
5560 u64 persistent_fid, u64 volatile_fid, u32 pid,
5561 u8 info_class, u8 info_type, u32 additional_info,
5562 void **data, unsigned int *size)
5563 {
5564 struct smb2_set_info_req *req;
5565 struct kvec *iov = rqst->rq_iov;
5566 unsigned int i, total_len;
5567 int rc;
5568
5569 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5570 (void **) &req, &total_len);
5571 if (rc)
5572 return rc;
5573
5574 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5575 req->InfoType = info_type;
5576 req->FileInfoClass = info_class;
5577 req->PersistentFileId = persistent_fid;
5578 req->VolatileFileId = volatile_fid;
5579 req->AdditionalInformation = cpu_to_le32(additional_info);
5580
5581 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5582 req->BufferLength = cpu_to_le32(*size);
5583
5584 memcpy(req->Buffer, *data, *size);
5585 total_len += *size;
5586
5587 iov[0].iov_base = (char *)req;
5588 /* 1 for Buffer */
5589 iov[0].iov_len = total_len - 1;
5590
5591 for (i = 1; i < rqst->rq_nvec; i++) {
5592 le32_add_cpu(&req->BufferLength, size[i]);
5593 iov[i].iov_base = (char *)data[i];
5594 iov[i].iov_len = size[i];
5595 }
5596
5597 return 0;
5598 }
5599
5600 void
SMB2_set_info_free(struct smb_rqst * rqst)5601 SMB2_set_info_free(struct smb_rqst *rqst)
5602 {
5603 if (rqst && rqst->rq_iov)
5604 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5605 }
5606
5607 static int
send_set_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,unsigned int num,void ** data,unsigned int * size)5608 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5609 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5610 u8 info_type, u32 additional_info, unsigned int num,
5611 void **data, unsigned int *size)
5612 {
5613 struct smb_rqst rqst;
5614 struct smb2_set_info_rsp *rsp = NULL;
5615 struct kvec *iov;
5616 struct kvec rsp_iov;
5617 int rc = 0;
5618 int resp_buftype;
5619 struct cifs_ses *ses = tcon->ses;
5620 struct TCP_Server_Info *server;
5621 int flags = 0;
5622 int retries = 0, cur_sleep = 1;
5623
5624 replay_again:
5625 /* reinitialize for possible replay */
5626 flags = 0;
5627 server = cifs_pick_channel(ses);
5628
5629 if (!ses || !server)
5630 return -EIO;
5631
5632 if (!num)
5633 return -EINVAL;
5634
5635 if (smb3_encryption_required(tcon))
5636 flags |= CIFS_TRANSFORM_REQ;
5637
5638 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5639 if (!iov)
5640 return -ENOMEM;
5641
5642 memset(&rqst, 0, sizeof(struct smb_rqst));
5643 rqst.rq_iov = iov;
5644 rqst.rq_nvec = num;
5645
5646 rc = SMB2_set_info_init(tcon, server,
5647 &rqst, persistent_fid, volatile_fid, pid,
5648 info_class, info_type, additional_info,
5649 data, size);
5650 if (rc) {
5651 kfree(iov);
5652 return rc;
5653 }
5654
5655 if (retries)
5656 smb2_set_replay(server, &rqst);
5657
5658 rc = cifs_send_recv(xid, ses, server,
5659 &rqst, &resp_buftype, flags,
5660 &rsp_iov);
5661 SMB2_set_info_free(&rqst);
5662 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5663
5664 if (rc != 0) {
5665 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5666 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5667 ses->Suid, info_class, (__u32)info_type, rc);
5668 }
5669
5670 free_rsp_buf(resp_buftype, rsp);
5671 kfree(iov);
5672
5673 if (is_replayable_error(rc) &&
5674 smb2_should_replay(tcon, &retries, &cur_sleep))
5675 goto replay_again;
5676
5677 return rc;
5678 }
5679
5680 int
SMB2_set_eof(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,loff_t new_eof)5681 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5682 u64 volatile_fid, u32 pid, loff_t new_eof)
5683 {
5684 struct smb2_file_eof_info info;
5685 void *data;
5686 unsigned int size;
5687
5688 info.EndOfFile = cpu_to_le64(new_eof);
5689
5690 data = &info;
5691 size = sizeof(struct smb2_file_eof_info);
5692
5693 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5694
5695 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5696 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5697 0, 1, &data, &size);
5698 }
5699
5700 int
SMB2_set_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb_ntsd * pnntsd,int pacllen,int aclflag)5701 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5702 u64 persistent_fid, u64 volatile_fid,
5703 struct smb_ntsd *pnntsd, int pacllen, int aclflag)
5704 {
5705 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5706 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5707 1, (void **)&pnntsd, &pacllen);
5708 }
5709
5710 int
SMB2_set_ea(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_full_ea_info * buf,int len)5711 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5712 u64 persistent_fid, u64 volatile_fid,
5713 struct smb2_file_full_ea_info *buf, int len)
5714 {
5715 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5716 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5717 0, 1, (void **)&buf, &len);
5718 }
5719
5720 int
SMB2_oplock_break(const unsigned int xid,struct cifs_tcon * tcon,const u64 persistent_fid,const u64 volatile_fid,__u8 oplock_level)5721 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5722 const u64 persistent_fid, const u64 volatile_fid,
5723 __u8 oplock_level)
5724 {
5725 struct smb_rqst rqst;
5726 int rc;
5727 struct smb2_oplock_break *req = NULL;
5728 struct cifs_ses *ses = tcon->ses;
5729 struct TCP_Server_Info *server;
5730 int flags = CIFS_OBREAK_OP;
5731 unsigned int total_len;
5732 struct kvec iov[1];
5733 struct kvec rsp_iov;
5734 int resp_buf_type;
5735 int retries = 0, cur_sleep = 1;
5736
5737 replay_again:
5738 /* reinitialize for possible replay */
5739 flags = CIFS_OBREAK_OP;
5740 server = cifs_pick_channel(ses);
5741
5742 cifs_dbg(FYI, "SMB2_oplock_break\n");
5743 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5744 (void **) &req, &total_len);
5745 if (rc)
5746 return rc;
5747
5748 if (smb3_encryption_required(tcon))
5749 flags |= CIFS_TRANSFORM_REQ;
5750
5751 req->VolatileFid = volatile_fid;
5752 req->PersistentFid = persistent_fid;
5753 req->OplockLevel = oplock_level;
5754 req->hdr.CreditRequest = cpu_to_le16(1);
5755
5756 flags |= CIFS_NO_RSP_BUF;
5757
5758 iov[0].iov_base = (char *)req;
5759 iov[0].iov_len = total_len;
5760
5761 memset(&rqst, 0, sizeof(struct smb_rqst));
5762 rqst.rq_iov = iov;
5763 rqst.rq_nvec = 1;
5764
5765 if (retries)
5766 smb2_set_replay(server, &rqst);
5767
5768 rc = cifs_send_recv(xid, ses, server,
5769 &rqst, &resp_buf_type, flags, &rsp_iov);
5770 cifs_small_buf_release(req);
5771 if (rc) {
5772 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5773 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5774 }
5775
5776 if (is_replayable_error(rc) &&
5777 smb2_should_replay(tcon, &retries, &cur_sleep))
5778 goto replay_again;
5779
5780 return rc;
5781 }
5782
5783 void
smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info * pfs_inf,struct kstatfs * kst)5784 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5785 struct kstatfs *kst)
5786 {
5787 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5788 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5789 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5790 kst->f_bfree = kst->f_bavail =
5791 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5792 return;
5793 }
5794
5795 static void
copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO * response_data,struct kstatfs * kst)5796 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5797 struct kstatfs *kst)
5798 {
5799 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5800 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5801 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
5802 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5803 kst->f_bavail = kst->f_bfree;
5804 else
5805 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5806 if (response_data->TotalFileNodes != cpu_to_le64(-1))
5807 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5808 if (response_data->FreeFileNodes != cpu_to_le64(-1))
5809 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5810
5811 return;
5812 }
5813
5814 static int
build_qfs_info_req(struct kvec * iov,struct cifs_tcon * tcon,struct TCP_Server_Info * server,int level,int outbuf_len,u64 persistent_fid,u64 volatile_fid)5815 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5816 struct TCP_Server_Info *server,
5817 int level, int outbuf_len, u64 persistent_fid,
5818 u64 volatile_fid)
5819 {
5820 int rc;
5821 struct smb2_query_info_req *req;
5822 unsigned int total_len;
5823
5824 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5825
5826 if ((tcon->ses == NULL) || server == NULL)
5827 return -EIO;
5828
5829 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5830 (void **) &req, &total_len);
5831 if (rc)
5832 return rc;
5833
5834 req->InfoType = SMB2_O_INFO_FILESYSTEM;
5835 req->FileInfoClass = level;
5836 req->PersistentFileId = persistent_fid;
5837 req->VolatileFileId = volatile_fid;
5838 /* 1 for pad */
5839 req->InputBufferOffset =
5840 cpu_to_le16(sizeof(struct smb2_query_info_req));
5841 req->OutputBufferLength = cpu_to_le32(
5842 outbuf_len + sizeof(struct smb2_query_info_rsp));
5843
5844 iov->iov_base = (char *)req;
5845 iov->iov_len = total_len;
5846 return 0;
5847 }
5848
free_qfs_info_req(struct kvec * iov)5849 static inline void free_qfs_info_req(struct kvec *iov)
5850 {
5851 cifs_buf_release(iov->iov_base);
5852 }
5853
5854 int
SMB311_posix_qfs_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5855 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5856 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5857 {
5858 struct smb_rqst rqst;
5859 struct smb2_query_info_rsp *rsp = NULL;
5860 struct kvec iov;
5861 struct kvec rsp_iov;
5862 int rc = 0;
5863 int resp_buftype;
5864 struct cifs_ses *ses = tcon->ses;
5865 struct TCP_Server_Info *server;
5866 FILE_SYSTEM_POSIX_INFO *info = NULL;
5867 int flags = 0;
5868 int retries = 0, cur_sleep = 1;
5869
5870 replay_again:
5871 /* reinitialize for possible replay */
5872 flags = 0;
5873 server = cifs_pick_channel(ses);
5874
5875 rc = build_qfs_info_req(&iov, tcon, server,
5876 FS_POSIX_INFORMATION,
5877 sizeof(FILE_SYSTEM_POSIX_INFO),
5878 persistent_fid, volatile_fid);
5879 if (rc)
5880 return rc;
5881
5882 if (smb3_encryption_required(tcon))
5883 flags |= CIFS_TRANSFORM_REQ;
5884
5885 memset(&rqst, 0, sizeof(struct smb_rqst));
5886 rqst.rq_iov = &iov;
5887 rqst.rq_nvec = 1;
5888
5889 if (retries)
5890 smb2_set_replay(server, &rqst);
5891
5892 rc = cifs_send_recv(xid, ses, server,
5893 &rqst, &resp_buftype, flags, &rsp_iov);
5894 free_qfs_info_req(&iov);
5895 if (rc) {
5896 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5897 goto posix_qfsinf_exit;
5898 }
5899 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5900
5901 info = (FILE_SYSTEM_POSIX_INFO *)(
5902 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5903 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5904 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5905 sizeof(FILE_SYSTEM_POSIX_INFO));
5906 if (!rc)
5907 copy_posix_fs_info_to_kstatfs(info, fsdata);
5908
5909 posix_qfsinf_exit:
5910 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5911
5912 if (is_replayable_error(rc) &&
5913 smb2_should_replay(tcon, &retries, &cur_sleep))
5914 goto replay_again;
5915
5916 return rc;
5917 }
5918
5919 int
SMB2_QFS_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5920 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5921 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5922 {
5923 struct smb_rqst rqst;
5924 struct smb2_query_info_rsp *rsp = NULL;
5925 struct kvec iov;
5926 struct kvec rsp_iov;
5927 int rc = 0;
5928 int resp_buftype;
5929 struct cifs_ses *ses = tcon->ses;
5930 struct TCP_Server_Info *server;
5931 struct smb2_fs_full_size_info *info = NULL;
5932 int flags = 0;
5933 int retries = 0, cur_sleep = 1;
5934
5935 replay_again:
5936 /* reinitialize for possible replay */
5937 flags = 0;
5938 server = cifs_pick_channel(ses);
5939
5940 rc = build_qfs_info_req(&iov, tcon, server,
5941 FS_FULL_SIZE_INFORMATION,
5942 sizeof(struct smb2_fs_full_size_info),
5943 persistent_fid, volatile_fid);
5944 if (rc)
5945 return rc;
5946
5947 if (smb3_encryption_required(tcon))
5948 flags |= CIFS_TRANSFORM_REQ;
5949
5950 memset(&rqst, 0, sizeof(struct smb_rqst));
5951 rqst.rq_iov = &iov;
5952 rqst.rq_nvec = 1;
5953
5954 if (retries)
5955 smb2_set_replay(server, &rqst);
5956
5957 rc = cifs_send_recv(xid, ses, server,
5958 &rqst, &resp_buftype, flags, &rsp_iov);
5959 free_qfs_info_req(&iov);
5960 if (rc) {
5961 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5962 goto qfsinf_exit;
5963 }
5964 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5965
5966 info = (struct smb2_fs_full_size_info *)(
5967 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5968 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5969 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5970 sizeof(struct smb2_fs_full_size_info));
5971 if (!rc)
5972 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5973
5974 qfsinf_exit:
5975 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5976
5977 if (is_replayable_error(rc) &&
5978 smb2_should_replay(tcon, &retries, &cur_sleep))
5979 goto replay_again;
5980
5981 return rc;
5982 }
5983
5984 int
SMB2_QFS_attr(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int level)5985 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5986 u64 persistent_fid, u64 volatile_fid, int level)
5987 {
5988 struct smb_rqst rqst;
5989 struct smb2_query_info_rsp *rsp = NULL;
5990 struct kvec iov;
5991 struct kvec rsp_iov;
5992 int rc = 0;
5993 int resp_buftype, max_len, min_len;
5994 struct cifs_ses *ses = tcon->ses;
5995 struct TCP_Server_Info *server;
5996 unsigned int rsp_len, offset;
5997 int flags = 0;
5998 int retries = 0, cur_sleep = 1;
5999
6000 replay_again:
6001 /* reinitialize for possible replay */
6002 flags = 0;
6003 server = cifs_pick_channel(ses);
6004
6005 if (level == FS_DEVICE_INFORMATION) {
6006 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6007 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6008 } else if (level == FS_ATTRIBUTE_INFORMATION) {
6009 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
6010 min_len = MIN_FS_ATTR_INFO_SIZE;
6011 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
6012 max_len = sizeof(struct smb3_fs_ss_info);
6013 min_len = sizeof(struct smb3_fs_ss_info);
6014 } else if (level == FS_VOLUME_INFORMATION) {
6015 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
6016 min_len = sizeof(struct smb3_fs_vol_info);
6017 } else {
6018 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
6019 return -EINVAL;
6020 }
6021
6022 rc = build_qfs_info_req(&iov, tcon, server,
6023 level, max_len,
6024 persistent_fid, volatile_fid);
6025 if (rc)
6026 return rc;
6027
6028 if (smb3_encryption_required(tcon))
6029 flags |= CIFS_TRANSFORM_REQ;
6030
6031 memset(&rqst, 0, sizeof(struct smb_rqst));
6032 rqst.rq_iov = &iov;
6033 rqst.rq_nvec = 1;
6034
6035 if (retries)
6036 smb2_set_replay(server, &rqst);
6037
6038 rc = cifs_send_recv(xid, ses, server,
6039 &rqst, &resp_buftype, flags, &rsp_iov);
6040 free_qfs_info_req(&iov);
6041 if (rc) {
6042 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6043 goto qfsattr_exit;
6044 }
6045 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6046
6047 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6048 offset = le16_to_cpu(rsp->OutputBufferOffset);
6049 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6050 if (rc)
6051 goto qfsattr_exit;
6052
6053 if (level == FS_ATTRIBUTE_INFORMATION)
6054 memcpy(&tcon->fsAttrInfo, offset
6055 + (char *)rsp, min_t(unsigned int,
6056 rsp_len, max_len));
6057 else if (level == FS_DEVICE_INFORMATION)
6058 memcpy(&tcon->fsDevInfo, offset
6059 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6060 else if (level == FS_SECTOR_SIZE_INFORMATION) {
6061 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6062 (offset + (char *)rsp);
6063 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6064 tcon->perf_sector_size =
6065 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6066 } else if (level == FS_VOLUME_INFORMATION) {
6067 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6068 (offset + (char *)rsp);
6069 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6070 tcon->vol_create_time = vol_info->VolumeCreationTime;
6071 }
6072
6073 qfsattr_exit:
6074 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6075
6076 if (is_replayable_error(rc) &&
6077 smb2_should_replay(tcon, &retries, &cur_sleep))
6078 goto replay_again;
6079
6080 return rc;
6081 }
6082
6083 int
smb2_lockv(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u32 num_lock,struct smb2_lock_element * buf)6084 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6085 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6086 const __u32 num_lock, struct smb2_lock_element *buf)
6087 {
6088 struct smb_rqst rqst;
6089 int rc = 0;
6090 struct smb2_lock_req *req = NULL;
6091 struct kvec iov[2];
6092 struct kvec rsp_iov;
6093 int resp_buf_type;
6094 unsigned int count;
6095 int flags = CIFS_NO_RSP_BUF;
6096 unsigned int total_len;
6097 struct TCP_Server_Info *server;
6098 int retries = 0, cur_sleep = 1;
6099
6100 replay_again:
6101 /* reinitialize for possible replay */
6102 flags = CIFS_NO_RSP_BUF;
6103 server = cifs_pick_channel(tcon->ses);
6104
6105 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6106
6107 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6108 (void **) &req, &total_len);
6109 if (rc)
6110 return rc;
6111
6112 if (smb3_encryption_required(tcon))
6113 flags |= CIFS_TRANSFORM_REQ;
6114
6115 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6116 req->LockCount = cpu_to_le16(num_lock);
6117
6118 req->PersistentFileId = persist_fid;
6119 req->VolatileFileId = volatile_fid;
6120
6121 count = num_lock * sizeof(struct smb2_lock_element);
6122
6123 iov[0].iov_base = (char *)req;
6124 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6125 iov[1].iov_base = (char *)buf;
6126 iov[1].iov_len = count;
6127
6128 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6129
6130 memset(&rqst, 0, sizeof(struct smb_rqst));
6131 rqst.rq_iov = iov;
6132 rqst.rq_nvec = 2;
6133
6134 if (retries)
6135 smb2_set_replay(server, &rqst);
6136
6137 rc = cifs_send_recv(xid, tcon->ses, server,
6138 &rqst, &resp_buf_type, flags,
6139 &rsp_iov);
6140 cifs_small_buf_release(req);
6141 if (rc) {
6142 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6143 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6144 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6145 tcon->ses->Suid, rc);
6146 }
6147
6148 if (is_replayable_error(rc) &&
6149 smb2_should_replay(tcon, &retries, &cur_sleep))
6150 goto replay_again;
6151
6152 return rc;
6153 }
6154
6155 int
SMB2_lock(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u64 length,const __u64 offset,const __u32 lock_flags,const bool wait)6156 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6157 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6158 const __u64 length, const __u64 offset, const __u32 lock_flags,
6159 const bool wait)
6160 {
6161 struct smb2_lock_element lock;
6162
6163 lock.Offset = cpu_to_le64(offset);
6164 lock.Length = cpu_to_le64(length);
6165 lock.Flags = cpu_to_le32(lock_flags);
6166 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6167 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6168
6169 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6170 }
6171
6172 int
SMB2_lease_break(const unsigned int xid,struct cifs_tcon * tcon,__u8 * lease_key,const __le32 lease_state)6173 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6174 __u8 *lease_key, const __le32 lease_state)
6175 {
6176 struct smb_rqst rqst;
6177 int rc;
6178 struct smb2_lease_ack *req = NULL;
6179 struct cifs_ses *ses = tcon->ses;
6180 int flags = CIFS_OBREAK_OP;
6181 unsigned int total_len;
6182 struct kvec iov[1];
6183 struct kvec rsp_iov;
6184 int resp_buf_type;
6185 __u64 *please_key_high;
6186 __u64 *please_key_low;
6187 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6188
6189 cifs_dbg(FYI, "SMB2_lease_break\n");
6190 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6191 (void **) &req, &total_len);
6192 if (rc)
6193 return rc;
6194
6195 if (smb3_encryption_required(tcon))
6196 flags |= CIFS_TRANSFORM_REQ;
6197
6198 req->hdr.CreditRequest = cpu_to_le16(1);
6199 req->StructureSize = cpu_to_le16(36);
6200 total_len += 12;
6201
6202 memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
6203 req->LeaseState = lease_state;
6204
6205 flags |= CIFS_NO_RSP_BUF;
6206
6207 iov[0].iov_base = (char *)req;
6208 iov[0].iov_len = total_len;
6209
6210 memset(&rqst, 0, sizeof(struct smb_rqst));
6211 rqst.rq_iov = iov;
6212 rqst.rq_nvec = 1;
6213
6214 rc = cifs_send_recv(xid, ses, server,
6215 &rqst, &resp_buf_type, flags, &rsp_iov);
6216 cifs_small_buf_release(req);
6217
6218 please_key_low = (__u64 *)lease_key;
6219 please_key_high = (__u64 *)(lease_key+8);
6220 if (rc) {
6221 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6222 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6223 ses->Suid, *please_key_low, *please_key_high, rc);
6224 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6225 } else
6226 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6227 ses->Suid, *please_key_low, *please_key_high);
6228
6229 return rc;
6230 }
6231