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1/*
2 * fs/cifs/smb2pdu.c
3 *
4 * Copyright (C) International Business Machines Corp., 2009, 2013
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * Contains the routines for constructing the SMB2 PDUs themselves
10 *
11 * This library is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published
13 * by the Free Software Foundation; either version 2.1 of the License, or
14 * (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
19 * the GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this library; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
27 /* Note that there are handle based routines which must be */
28 /* treated slightly differently for reconnection purposes since we never */
29 /* want to reuse a stale file handle and only the caller knows the file info */
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/vfs.h>
34#include <linux/task_io_accounting_ops.h>
35#include <linux/uaccess.h>
36#include <linux/uuid.h>
37#include <linux/pagemap.h>
38#include <linux/xattr.h>
39#include "smb2pdu.h"
40#include "cifsglob.h"
41#include "cifsacl.h"
42#include "cifsproto.h"
43#include "smb2proto.h"
44#include "cifs_unicode.h"
45#include "cifs_debug.h"
46#include "ntlmssp.h"
47#include "smb2status.h"
48#include "smb2glob.h"
49#include "cifspdu.h"
50#include "cifs_spnego.h"
51#include "smbdirect.h"
52#include "trace.h"
53#ifdef CONFIG_CIFS_DFS_UPCALL
54#include "dfs_cache.h"
55#endif
56
57/*
58 * The following table defines the expected "StructureSize" of SMB2 requests
59 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
60 *
61 * Note that commands are defined in smb2pdu.h in le16 but the array below is
62 * indexed by command in host byte order.
63 */
64static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
65 /* SMB2_NEGOTIATE */ 36,
66 /* SMB2_SESSION_SETUP */ 25,
67 /* SMB2_LOGOFF */ 4,
68 /* SMB2_TREE_CONNECT */ 9,
69 /* SMB2_TREE_DISCONNECT */ 4,
70 /* SMB2_CREATE */ 57,
71 /* SMB2_CLOSE */ 24,
72 /* SMB2_FLUSH */ 24,
73 /* SMB2_READ */ 49,
74 /* SMB2_WRITE */ 49,
75 /* SMB2_LOCK */ 48,
76 /* SMB2_IOCTL */ 57,
77 /* SMB2_CANCEL */ 4,
78 /* SMB2_ECHO */ 4,
79 /* SMB2_QUERY_DIRECTORY */ 33,
80 /* SMB2_CHANGE_NOTIFY */ 32,
81 /* SMB2_QUERY_INFO */ 41,
82 /* SMB2_SET_INFO */ 33,
83 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
84};
85
86int smb3_encryption_required(const struct cifs_tcon *tcon)
87{
88 if (!tcon || !tcon->ses)
89 return 0;
90 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
91 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
92 return 1;
93 if (tcon->seal &&
94 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
95 return 1;
96 return 0;
97}
98
99static void
100smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
101 const struct cifs_tcon *tcon,
102 struct TCP_Server_Info *server)
103{
104 shdr->ProtocolId = SMB2_PROTO_NUMBER;
105 shdr->StructureSize = cpu_to_le16(64);
106 shdr->Command = smb2_cmd;
107 if (server) {
108 spin_lock(&server->req_lock);
109 /* Request up to 10 credits but don't go over the limit. */
110 if (server->credits >= server->max_credits)
111 shdr->CreditRequest = cpu_to_le16(0);
112 else
113 shdr->CreditRequest = cpu_to_le16(
114 min_t(int, server->max_credits -
115 server->credits, 10));
116 spin_unlock(&server->req_lock);
117 } else {
118 shdr->CreditRequest = cpu_to_le16(2);
119 }
120 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
121
122 if (!tcon)
123 goto out;
124
125 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
126 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
127 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
128 shdr->CreditCharge = cpu_to_le16(1);
129 /* else CreditCharge MBZ */
130
131 shdr->TreeId = tcon->tid;
132 /* Uid is not converted */
133 if (tcon->ses)
134 shdr->SessionId = tcon->ses->Suid;
135
136 /*
137 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
138 * to pass the path on the Open SMB prefixed by \\server\share.
139 * Not sure when we would need to do the augmented path (if ever) and
140 * setting this flag breaks the SMB2 open operation since it is
141 * illegal to send an empty path name (without \\server\share prefix)
142 * when the DFS flag is set in the SMB open header. We could
143 * consider setting the flag on all operations other than open
144 * but it is safer to net set it for now.
145 */
146/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
147 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
148
149 if (server && server->sign && !smb3_encryption_required(tcon))
150 shdr->Flags |= SMB2_FLAGS_SIGNED;
151out:
152 return;
153}
154
155static int
156smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
157 struct TCP_Server_Info *server)
158{
159 int rc;
160 struct nls_table *nls_codepage;
161 struct cifs_ses *ses;
162 int retries;
163
164 /*
165 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
166 * check for tcp and smb session status done differently
167 * for those three - in the calling routine.
168 */
169 if (tcon == NULL)
170 return 0;
171
172 if (smb2_command == SMB2_TREE_CONNECT)
173 return 0;
174
175 if (tcon->tidStatus == CifsExiting) {
176 /*
177 * only tree disconnect, open, and write,
178 * (and ulogoff which does not have tcon)
179 * are allowed as we start force umount.
180 */
181 if ((smb2_command != SMB2_WRITE) &&
182 (smb2_command != SMB2_CREATE) &&
183 (smb2_command != SMB2_TREE_DISCONNECT)) {
184 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
185 smb2_command);
186 return -ENODEV;
187 }
188 }
189 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
190 (!tcon->ses->server) || !server)
191 return -EIO;
192
193 ses = tcon->ses;
194 retries = server->nr_targets;
195
196 /*
197 * Give demultiplex thread up to 10 seconds to each target available for
198 * reconnect -- should be greater than cifs socket timeout which is 7
199 * seconds.
200 */
201 while (server->tcpStatus == CifsNeedReconnect) {
202 /*
203 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
204 * here since they are implicitly done when session drops.
205 */
206 switch (smb2_command) {
207 /*
208 * BB Should we keep oplock break and add flush to exceptions?
209 */
210 case SMB2_TREE_DISCONNECT:
211 case SMB2_CANCEL:
212 case SMB2_CLOSE:
213 case SMB2_OPLOCK_BREAK:
214 return -EAGAIN;
215 }
216
217 rc = wait_event_interruptible_timeout(server->response_q,
218 (server->tcpStatus != CifsNeedReconnect),
219 10 * HZ);
220 if (rc < 0) {
221 cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
222 __func__);
223 return -ERESTARTSYS;
224 }
225
226 /* are we still trying to reconnect? */
227 if (server->tcpStatus != CifsNeedReconnect)
228 break;
229
230 if (retries && --retries)
231 continue;
232
233 /*
234 * on "soft" mounts we wait once. Hard mounts keep
235 * retrying until process is killed or server comes
236 * back on-line
237 */
238 if (!tcon->retry) {
239 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
240 return -EHOSTDOWN;
241 }
242 retries = server->nr_targets;
243 }
244
245 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
246 return 0;
247
248 nls_codepage = load_nls_default();
249
250 /*
251 * need to prevent multiple threads trying to simultaneously reconnect
252 * the same SMB session
253 */
254 mutex_lock(&tcon->ses->session_mutex);
255
256 /*
257 * Recheck after acquire mutex. If another thread is negotiating
258 * and the server never sends an answer the socket will be closed
259 * and tcpStatus set to reconnect.
260 */
261 if (server->tcpStatus == CifsNeedReconnect) {
262 rc = -EHOSTDOWN;
263 mutex_unlock(&tcon->ses->session_mutex);
264 goto out;
265 }
266
267 /*
268 * If we are reconnecting an extra channel, bind
269 */
270 if (server->is_channel) {
271 ses->binding = true;
272 ses->binding_chan = cifs_ses_find_chan(ses, server);
273 }
274
275 rc = cifs_negotiate_protocol(0, tcon->ses);
276 if (!rc && tcon->ses->need_reconnect) {
277 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
278 if ((rc == -EACCES) && !tcon->retry) {
279 rc = -EHOSTDOWN;
280 ses->binding = false;
281 ses->binding_chan = NULL;
282 mutex_unlock(&tcon->ses->session_mutex);
283 goto failed;
284 }
285 }
286 /*
287 * End of channel binding
288 */
289 ses->binding = false;
290 ses->binding_chan = NULL;
291
292 if (rc || !tcon->need_reconnect) {
293 mutex_unlock(&tcon->ses->session_mutex);
294 goto out;
295 }
296
297 cifs_mark_open_files_invalid(tcon);
298 if (tcon->use_persistent)
299 tcon->need_reopen_files = true;
300
301 rc = cifs_tree_connect(0, tcon, nls_codepage);
302 mutex_unlock(&tcon->ses->session_mutex);
303
304 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
305 if (rc) {
306 /* If sess reconnected but tcon didn't, something strange ... */
307 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
308 goto out;
309 }
310
311 if (smb2_command != SMB2_INTERNAL_CMD)
312 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
313
314 atomic_inc(&tconInfoReconnectCount);
315out:
316 /*
317 * Check if handle based operation so we know whether we can continue
318 * or not without returning to caller to reset file handle.
319 */
320 /*
321 * BB Is flush done by server on drop of tcp session? Should we special
322 * case it and skip above?
323 */
324 switch (smb2_command) {
325 case SMB2_FLUSH:
326 case SMB2_READ:
327 case SMB2_WRITE:
328 case SMB2_LOCK:
329 case SMB2_IOCTL:
330 case SMB2_QUERY_DIRECTORY:
331 case SMB2_CHANGE_NOTIFY:
332 case SMB2_QUERY_INFO:
333 case SMB2_SET_INFO:
334 rc = -EAGAIN;
335 }
336failed:
337 unload_nls(nls_codepage);
338 return rc;
339}
340
341static void
342fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
343 struct TCP_Server_Info *server,
344 void *buf,
345 unsigned int *total_len)
346{
347 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
348 /* lookup word count ie StructureSize from table */
349 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
350
351 /*
352 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
353 * largest operations (Create)
354 */
355 memset(buf, 0, 256);
356
357 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
358 spdu->StructureSize2 = cpu_to_le16(parmsize);
359
360 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
361}
362
363/*
364 * Allocate and return pointer to an SMB request hdr, and set basic
365 * SMB information in the SMB header. If the return code is zero, this
366 * function must have filled in request_buf pointer.
367 */
368static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
369 struct TCP_Server_Info *server,
370 void **request_buf, unsigned int *total_len)
371{
372 /* BB eventually switch this to SMB2 specific small buf size */
373 if (smb2_command == SMB2_SET_INFO)
374 *request_buf = cifs_buf_get();
375 else
376 *request_buf = cifs_small_buf_get();
377 if (*request_buf == NULL) {
378 /* BB should we add a retry in here if not a writepage? */
379 return -ENOMEM;
380 }
381
382 fill_small_buf(smb2_command, tcon, server,
383 (struct smb2_sync_hdr *)(*request_buf),
384 total_len);
385
386 if (tcon != NULL) {
387 uint16_t com_code = le16_to_cpu(smb2_command);
388 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
389 cifs_stats_inc(&tcon->num_smbs_sent);
390 }
391
392 return 0;
393}
394
395static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
396 struct TCP_Server_Info *server,
397 void **request_buf, unsigned int *total_len)
398{
399 int rc;
400
401 rc = smb2_reconnect(smb2_command, tcon, server);
402 if (rc)
403 return rc;
404
405 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
406 total_len);
407}
408
409static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
410 struct TCP_Server_Info *server,
411 void **request_buf, unsigned int *total_len)
412{
413 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
414 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
415 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
416 request_buf, total_len);
417 }
418 return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
419 request_buf, total_len);
420}
421
422/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
423
424static void
425build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
426{
427 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
428 pneg_ctxt->DataLength = cpu_to_le16(38);
429 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
430 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
431 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
432 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
433}
434
435static void
436build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
437{
438 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
439 pneg_ctxt->DataLength =
440 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
441 - sizeof(struct smb2_neg_context));
442 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
443 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
444 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
445 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
446}
447
448static void
449build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
450{
451 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
452 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
453 pneg_ctxt->CipherCount = cpu_to_le16(2);
454 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
455 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
456}
457
458static unsigned int
459build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
460{
461 struct nls_table *cp = load_nls_default();
462
463 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
464
465 /* copy up to max of first 100 bytes of server name to NetName field */
466 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
467 /* context size is DataLength + minimal smb2_neg_context */
468 return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
469 sizeof(struct smb2_neg_context), 8) * 8;
470}
471
472static void
473build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
474{
475 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
476 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
477 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
478 pneg_ctxt->Name[0] = 0x93;
479 pneg_ctxt->Name[1] = 0xAD;
480 pneg_ctxt->Name[2] = 0x25;
481 pneg_ctxt->Name[3] = 0x50;
482 pneg_ctxt->Name[4] = 0x9C;
483 pneg_ctxt->Name[5] = 0xB4;
484 pneg_ctxt->Name[6] = 0x11;
485 pneg_ctxt->Name[7] = 0xE7;
486 pneg_ctxt->Name[8] = 0xB4;
487 pneg_ctxt->Name[9] = 0x23;
488 pneg_ctxt->Name[10] = 0x83;
489 pneg_ctxt->Name[11] = 0xDE;
490 pneg_ctxt->Name[12] = 0x96;
491 pneg_ctxt->Name[13] = 0x8B;
492 pneg_ctxt->Name[14] = 0xCD;
493 pneg_ctxt->Name[15] = 0x7C;
494}
495
496static void
497assemble_neg_contexts(struct smb2_negotiate_req *req,
498 struct TCP_Server_Info *server, unsigned int *total_len)
499{
500 char *pneg_ctxt;
501 unsigned int ctxt_len;
502
503 if (*total_len > 200) {
504 /* In case length corrupted don't want to overrun smb buffer */
505 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
506 return;
507 }
508
509 /*
510 * round up total_len of fixed part of SMB3 negotiate request to 8
511 * byte boundary before adding negotiate contexts
512 */
513 *total_len = roundup(*total_len, 8);
514
515 pneg_ctxt = (*total_len) + (char *)req;
516 req->NegotiateContextOffset = cpu_to_le32(*total_len);
517
518 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
519 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
520 *total_len += ctxt_len;
521 pneg_ctxt += ctxt_len;
522
523 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
524 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
525 *total_len += ctxt_len;
526 pneg_ctxt += ctxt_len;
527
528 if (server->compress_algorithm) {
529 build_compression_ctxt((struct smb2_compression_capabilities_context *)
530 pneg_ctxt);
531 ctxt_len = DIV_ROUND_UP(
532 sizeof(struct smb2_compression_capabilities_context),
533 8) * 8;
534 *total_len += ctxt_len;
535 pneg_ctxt += ctxt_len;
536 req->NegotiateContextCount = cpu_to_le16(5);
537 } else
538 req->NegotiateContextCount = cpu_to_le16(4);
539
540 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
541 server->hostname);
542 *total_len += ctxt_len;
543 pneg_ctxt += ctxt_len;
544
545 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
546 *total_len += sizeof(struct smb2_posix_neg_context);
547}
548
549static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
550{
551 unsigned int len = le16_to_cpu(ctxt->DataLength);
552
553 /* If invalid preauth context warn but use what we requested, SHA-512 */
554 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
555 pr_warn_once("server sent bad preauth context\n");
556 return;
557 }
558 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
559 pr_warn_once("Invalid SMB3 hash algorithm count\n");
560 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
561 pr_warn_once("unknown SMB3 hash algorithm\n");
562}
563
564static void decode_compress_ctx(struct TCP_Server_Info *server,
565 struct smb2_compression_capabilities_context *ctxt)
566{
567 unsigned int len = le16_to_cpu(ctxt->DataLength);
568
569 /* sizeof compress context is a one element compression capbility struct */
570 if (len < 10) {
571 pr_warn_once("server sent bad compression cntxt\n");
572 return;
573 }
574 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
575 pr_warn_once("Invalid SMB3 compress algorithm count\n");
576 return;
577 }
578 if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
579 pr_warn_once("unknown compression algorithm\n");
580 return;
581 }
582 server->compress_algorithm = ctxt->CompressionAlgorithms[0];
583}
584
585static int decode_encrypt_ctx(struct TCP_Server_Info *server,
586 struct smb2_encryption_neg_context *ctxt)
587{
588 unsigned int len = le16_to_cpu(ctxt->DataLength);
589
590 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
591 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
592 pr_warn_once("server sent bad crypto ctxt len\n");
593 return -EINVAL;
594 }
595
596 if (le16_to_cpu(ctxt->CipherCount) != 1) {
597 pr_warn_once("Invalid SMB3.11 cipher count\n");
598 return -EINVAL;
599 }
600 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
601 if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
602 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
603 pr_warn_once("Invalid SMB3.11 cipher returned\n");
604 return -EINVAL;
605 }
606 server->cipher_type = ctxt->Ciphers[0];
607 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
608 return 0;
609}
610
611static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
612 struct TCP_Server_Info *server,
613 unsigned int len_of_smb)
614{
615 struct smb2_neg_context *pctx;
616 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
617 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
618 unsigned int len_of_ctxts, i;
619 int rc = 0;
620
621 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
622 if (len_of_smb <= offset) {
623 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
624 return -EINVAL;
625 }
626
627 len_of_ctxts = len_of_smb - offset;
628
629 for (i = 0; i < ctxt_cnt; i++) {
630 int clen;
631 /* check that offset is not beyond end of SMB */
632 if (len_of_ctxts == 0)
633 break;
634
635 if (len_of_ctxts < sizeof(struct smb2_neg_context))
636 break;
637
638 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
639 clen = le16_to_cpu(pctx->DataLength);
640 if (clen > len_of_ctxts)
641 break;
642
643 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
644 decode_preauth_context(
645 (struct smb2_preauth_neg_context *)pctx);
646 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
647 rc = decode_encrypt_ctx(server,
648 (struct smb2_encryption_neg_context *)pctx);
649 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
650 decode_compress_ctx(server,
651 (struct smb2_compression_capabilities_context *)pctx);
652 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
653 server->posix_ext_supported = true;
654 else
655 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
656 le16_to_cpu(pctx->ContextType));
657
658 if (rc)
659 break;
660 /* offsets must be 8 byte aligned */
661 clen = (clen + 7) & ~0x7;
662 offset += clen + sizeof(struct smb2_neg_context);
663 len_of_ctxts -= clen;
664 }
665 return rc;
666}
667
668static struct create_posix *
669create_posix_buf(umode_t mode)
670{
671 struct create_posix *buf;
672
673 buf = kzalloc(sizeof(struct create_posix),
674 GFP_KERNEL);
675 if (!buf)
676 return NULL;
677
678 buf->ccontext.DataOffset =
679 cpu_to_le16(offsetof(struct create_posix, Mode));
680 buf->ccontext.DataLength = cpu_to_le32(4);
681 buf->ccontext.NameOffset =
682 cpu_to_le16(offsetof(struct create_posix, Name));
683 buf->ccontext.NameLength = cpu_to_le16(16);
684
685 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
686 buf->Name[0] = 0x93;
687 buf->Name[1] = 0xAD;
688 buf->Name[2] = 0x25;
689 buf->Name[3] = 0x50;
690 buf->Name[4] = 0x9C;
691 buf->Name[5] = 0xB4;
692 buf->Name[6] = 0x11;
693 buf->Name[7] = 0xE7;
694 buf->Name[8] = 0xB4;
695 buf->Name[9] = 0x23;
696 buf->Name[10] = 0x83;
697 buf->Name[11] = 0xDE;
698 buf->Name[12] = 0x96;
699 buf->Name[13] = 0x8B;
700 buf->Name[14] = 0xCD;
701 buf->Name[15] = 0x7C;
702 buf->Mode = cpu_to_le32(mode);
703 cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
704 return buf;
705}
706
707static int
708add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
709{
710 struct smb2_create_req *req = iov[0].iov_base;
711 unsigned int num = *num_iovec;
712
713 iov[num].iov_base = create_posix_buf(mode);
714 if (mode == ACL_NO_MODE)
715 cifs_dbg(FYI, "Invalid mode\n");
716 if (iov[num].iov_base == NULL)
717 return -ENOMEM;
718 iov[num].iov_len = sizeof(struct create_posix);
719 if (!req->CreateContextsOffset)
720 req->CreateContextsOffset = cpu_to_le32(
721 sizeof(struct smb2_create_req) +
722 iov[num - 1].iov_len);
723 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
724 *num_iovec = num + 1;
725 return 0;
726}
727
728
729/*
730 *
731 * SMB2 Worker functions follow:
732 *
733 * The general structure of the worker functions is:
734 * 1) Call smb2_init (assembles SMB2 header)
735 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
736 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
737 * 4) Decode SMB2 command specific fields in the fixed length area
738 * 5) Decode variable length data area (if any for this SMB2 command type)
739 * 6) Call free smb buffer
740 * 7) return
741 *
742 */
743
744int
745SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
746{
747 struct smb_rqst rqst;
748 struct smb2_negotiate_req *req;
749 struct smb2_negotiate_rsp *rsp;
750 struct kvec iov[1];
751 struct kvec rsp_iov;
752 int rc = 0;
753 int resp_buftype;
754 struct TCP_Server_Info *server = cifs_ses_server(ses);
755 int blob_offset, blob_length;
756 char *security_blob;
757 int flags = CIFS_NEG_OP;
758 unsigned int total_len;
759
760 cifs_dbg(FYI, "Negotiate protocol\n");
761
762 if (!server) {
763 WARN(1, "%s: server is NULL!\n", __func__);
764 return -EIO;
765 }
766
767 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
768 (void **) &req, &total_len);
769 if (rc)
770 return rc;
771
772 req->sync_hdr.SessionId = 0;
773
774 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
775 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
776
777 if (strcmp(server->vals->version_string,
778 SMB3ANY_VERSION_STRING) == 0) {
779 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
780 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
781 req->DialectCount = cpu_to_le16(2);
782 total_len += 4;
783 } else if (strcmp(server->vals->version_string,
784 SMBDEFAULT_VERSION_STRING) == 0) {
785 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
786 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
787 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
788 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
789 req->DialectCount = cpu_to_le16(4);
790 total_len += 8;
791 } else {
792 /* otherwise send specific dialect */
793 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
794 req->DialectCount = cpu_to_le16(1);
795 total_len += 2;
796 }
797
798 /* only one of SMB2 signing flags may be set in SMB2 request */
799 if (ses->sign)
800 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
801 else if (global_secflags & CIFSSEC_MAY_SIGN)
802 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
803 else
804 req->SecurityMode = 0;
805
806 req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
807
808 /* ClientGUID must be zero for SMB2.02 dialect */
809 if (server->vals->protocol_id == SMB20_PROT_ID)
810 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
811 else {
812 memcpy(req->ClientGUID, server->client_guid,
813 SMB2_CLIENT_GUID_SIZE);
814 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
815 (strcmp(server->vals->version_string,
816 SMBDEFAULT_VERSION_STRING) == 0))
817 assemble_neg_contexts(req, server, &total_len);
818 }
819 iov[0].iov_base = (char *)req;
820 iov[0].iov_len = total_len;
821
822 memset(&rqst, 0, sizeof(struct smb_rqst));
823 rqst.rq_iov = iov;
824 rqst.rq_nvec = 1;
825
826 rc = cifs_send_recv(xid, ses, server,
827 &rqst, &resp_buftype, flags, &rsp_iov);
828 cifs_small_buf_release(req);
829 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
830 /*
831 * No tcon so can't do
832 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
833 */
834 if (rc == -EOPNOTSUPP) {
835 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");
836 goto neg_exit;
837 } else if (rc != 0)
838 goto neg_exit;
839
840 if (strcmp(server->vals->version_string,
841 SMB3ANY_VERSION_STRING) == 0) {
842 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
843 cifs_server_dbg(VFS,
844 "SMB2 dialect returned but not requested\n");
845 return -EIO;
846 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
847 cifs_server_dbg(VFS,
848 "SMB2.1 dialect returned but not requested\n");
849 return -EIO;
850 }
851 } else if (strcmp(server->vals->version_string,
852 SMBDEFAULT_VERSION_STRING) == 0) {
853 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
854 cifs_server_dbg(VFS,
855 "SMB2 dialect returned but not requested\n");
856 return -EIO;
857 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
858 /* ops set to 3.0 by default for default so update */
859 server->ops = &smb21_operations;
860 server->vals = &smb21_values;
861 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
862 server->ops = &smb311_operations;
863 server->vals = &smb311_values;
864 }
865 } else if (le16_to_cpu(rsp->DialectRevision) !=
866 server->vals->protocol_id) {
867 /* if requested single dialect ensure returned dialect matched */
868 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
869 le16_to_cpu(rsp->DialectRevision));
870 return -EIO;
871 }
872
873 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
874
875 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
876 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
877 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
878 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
879 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
880 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
881 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
882 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
883 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
884 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
885 else {
886 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
887 le16_to_cpu(rsp->DialectRevision));
888 rc = -EIO;
889 goto neg_exit;
890 }
891 server->dialect = le16_to_cpu(rsp->DialectRevision);
892
893 /*
894 * Keep a copy of the hash after negprot. This hash will be
895 * the starting hash value for all sessions made from this
896 * server.
897 */
898 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
899 SMB2_PREAUTH_HASH_SIZE);
900
901 /* SMB2 only has an extended negflavor */
902 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
903 /* set it to the maximum buffer size value we can send with 1 credit */
904 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
905 SMB2_MAX_BUFFER_SIZE);
906 server->max_read = le32_to_cpu(rsp->MaxReadSize);
907 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
908 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
909 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
910 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
911 server->sec_mode);
912 server->capabilities = le32_to_cpu(rsp->Capabilities);
913 /* Internal types */
914 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
915
916 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
917 (struct smb2_sync_hdr *)rsp);
918 /*
919 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
920 * for us will be
921 * ses->sectype = RawNTLMSSP;
922 * but for time being this is our only auth choice so doesn't matter.
923 * We just found a server which sets blob length to zero expecting raw.
924 */
925 if (blob_length == 0) {
926 cifs_dbg(FYI, "missing security blob on negprot\n");
927 server->sec_ntlmssp = true;
928 }
929
930 rc = cifs_enable_signing(server, ses->sign);
931 if (rc)
932 goto neg_exit;
933 if (blob_length) {
934 rc = decode_negTokenInit(security_blob, blob_length, server);
935 if (rc == 1)
936 rc = 0;
937 else if (rc == 0)
938 rc = -EIO;
939 }
940
941 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
942 if (rsp->NegotiateContextCount)
943 rc = smb311_decode_neg_context(rsp, server,
944 rsp_iov.iov_len);
945 else
946 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
947 }
948neg_exit:
949 free_rsp_buf(resp_buftype, rsp);
950 return rc;
951}
952
953int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
954{
955 int rc;
956 struct validate_negotiate_info_req *pneg_inbuf;
957 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
958 u32 rsplen;
959 u32 inbuflen; /* max of 4 dialects */
960 struct TCP_Server_Info *server = tcon->ses->server;
961
962 cifs_dbg(FYI, "validate negotiate\n");
963
964 /* In SMB3.11 preauth integrity supersedes validate negotiate */
965 if (server->dialect == SMB311_PROT_ID)
966 return 0;
967
968 /*
969 * validation ioctl must be signed, so no point sending this if we
970 * can not sign it (ie are not known user). Even if signing is not
971 * required (enabled but not negotiated), in those cases we selectively
972 * sign just this, the first and only signed request on a connection.
973 * Having validation of negotiate info helps reduce attack vectors.
974 */
975 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
976 return 0; /* validation requires signing */
977
978 if (tcon->ses->user_name == NULL) {
979 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
980 return 0; /* validation requires signing */
981 }
982
983 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
984 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
985
986 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
987 if (!pneg_inbuf)
988 return -ENOMEM;
989
990 pneg_inbuf->Capabilities =
991 cpu_to_le32(server->vals->req_capabilities);
992 memcpy(pneg_inbuf->Guid, server->client_guid,
993 SMB2_CLIENT_GUID_SIZE);
994
995 if (tcon->ses->sign)
996 pneg_inbuf->SecurityMode =
997 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
998 else if (global_secflags & CIFSSEC_MAY_SIGN)
999 pneg_inbuf->SecurityMode =
1000 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1001 else
1002 pneg_inbuf->SecurityMode = 0;
1003
1004
1005 if (strcmp(server->vals->version_string,
1006 SMB3ANY_VERSION_STRING) == 0) {
1007 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1008 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1009 pneg_inbuf->DialectCount = cpu_to_le16(2);
1010 /* structure is big enough for 3 dialects, sending only 2 */
1011 inbuflen = sizeof(*pneg_inbuf) -
1012 (2 * sizeof(pneg_inbuf->Dialects[0]));
1013 } else if (strcmp(server->vals->version_string,
1014 SMBDEFAULT_VERSION_STRING) == 0) {
1015 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1016 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1017 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1018 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1019 pneg_inbuf->DialectCount = cpu_to_le16(4);
1020 /* structure is big enough for 3 dialects */
1021 inbuflen = sizeof(*pneg_inbuf);
1022 } else {
1023 /* otherwise specific dialect was requested */
1024 pneg_inbuf->Dialects[0] =
1025 cpu_to_le16(server->vals->protocol_id);
1026 pneg_inbuf->DialectCount = cpu_to_le16(1);
1027 /* structure is big enough for 3 dialects, sending only 1 */
1028 inbuflen = sizeof(*pneg_inbuf) -
1029 sizeof(pneg_inbuf->Dialects[0]) * 2;
1030 }
1031
1032 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1033 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1034 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1035 (char **)&pneg_rsp, &rsplen);
1036 if (rc == -EOPNOTSUPP) {
1037 /*
1038 * Old Windows versions or Netapp SMB server can return
1039 * not supported error. Client should accept it.
1040 */
1041 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1042 rc = 0;
1043 goto out_free_inbuf;
1044 } else if (rc != 0) {
1045 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1046 rc);
1047 rc = -EIO;
1048 goto out_free_inbuf;
1049 }
1050
1051 rc = -EIO;
1052 if (rsplen != sizeof(*pneg_rsp)) {
1053 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1054 rsplen);
1055
1056 /* relax check since Mac returns max bufsize allowed on ioctl */
1057 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1058 goto out_free_rsp;
1059 }
1060
1061 /* check validate negotiate info response matches what we got earlier */
1062 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1063 goto vneg_out;
1064
1065 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1066 goto vneg_out;
1067
1068 /* do not validate server guid because not saved at negprot time yet */
1069
1070 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1071 SMB2_LARGE_FILES) != server->capabilities)
1072 goto vneg_out;
1073
1074 /* validate negotiate successful */
1075 rc = 0;
1076 cifs_dbg(FYI, "validate negotiate info successful\n");
1077 goto out_free_rsp;
1078
1079vneg_out:
1080 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1081out_free_rsp:
1082 kfree(pneg_rsp);
1083out_free_inbuf:
1084 kfree(pneg_inbuf);
1085 return rc;
1086}
1087
1088enum securityEnum
1089smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1090{
1091 switch (requested) {
1092 case Kerberos:
1093 case RawNTLMSSP:
1094 return requested;
1095 case NTLMv2:
1096 return RawNTLMSSP;
1097 case Unspecified:
1098 if (server->sec_ntlmssp &&
1099 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1100 return RawNTLMSSP;
1101 if ((server->sec_kerberos || server->sec_mskerberos) &&
1102 (global_secflags & CIFSSEC_MAY_KRB5))
1103 return Kerberos;
1104 fallthrough;
1105 default:
1106 return Unspecified;
1107 }
1108}
1109
1110struct SMB2_sess_data {
1111 unsigned int xid;
1112 struct cifs_ses *ses;
1113 struct nls_table *nls_cp;
1114 void (*func)(struct SMB2_sess_data *);
1115 int result;
1116 u64 previous_session;
1117
1118 /* we will send the SMB in three pieces:
1119 * a fixed length beginning part, an optional
1120 * SPNEGO blob (which can be zero length), and a
1121 * last part which will include the strings
1122 * and rest of bcc area. This allows us to avoid
1123 * a large buffer 17K allocation
1124 */
1125 int buf0_type;
1126 struct kvec iov[2];
1127};
1128
1129static int
1130SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1131{
1132 int rc;
1133 struct cifs_ses *ses = sess_data->ses;
1134 struct smb2_sess_setup_req *req;
1135 struct TCP_Server_Info *server = cifs_ses_server(ses);
1136 unsigned int total_len;
1137
1138 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1139 (void **) &req,
1140 &total_len);
1141 if (rc)
1142 return rc;
1143
1144 if (sess_data->ses->binding) {
1145 req->sync_hdr.SessionId = sess_data->ses->Suid;
1146 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1147 req->PreviousSessionId = 0;
1148 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1149 } else {
1150 /* First session, not a reauthenticate */
1151 req->sync_hdr.SessionId = 0;
1152 /*
1153 * if reconnect, we need to send previous sess id
1154 * otherwise it is 0
1155 */
1156 req->PreviousSessionId = sess_data->previous_session;
1157 req->Flags = 0; /* MBZ */
1158 }
1159
1160 /* enough to enable echos and oplocks and one max size write */
1161 req->sync_hdr.CreditRequest = cpu_to_le16(130);
1162
1163 /* only one of SMB2 signing flags may be set in SMB2 request */
1164 if (server->sign)
1165 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1166 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1167 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1168 else
1169 req->SecurityMode = 0;
1170
1171#ifdef CONFIG_CIFS_DFS_UPCALL
1172 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1173#else
1174 req->Capabilities = 0;
1175#endif /* DFS_UPCALL */
1176
1177 req->Channel = 0; /* MBZ */
1178
1179 sess_data->iov[0].iov_base = (char *)req;
1180 /* 1 for pad */
1181 sess_data->iov[0].iov_len = total_len - 1;
1182 /*
1183 * This variable will be used to clear the buffer
1184 * allocated above in case of any error in the calling function.
1185 */
1186 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1187
1188 return 0;
1189}
1190
1191static void
1192SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1193{
1194 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1195 sess_data->buf0_type = CIFS_NO_BUFFER;
1196}
1197
1198static int
1199SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1200{
1201 int rc;
1202 struct smb_rqst rqst;
1203 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1204 struct kvec rsp_iov = { NULL, 0 };
1205
1206 /* Testing shows that buffer offset must be at location of Buffer[0] */
1207 req->SecurityBufferOffset =
1208 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1209 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1210
1211 memset(&rqst, 0, sizeof(struct smb_rqst));
1212 rqst.rq_iov = sess_data->iov;
1213 rqst.rq_nvec = 2;
1214
1215 /* BB add code to build os and lm fields */
1216 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1217 cifs_ses_server(sess_data->ses),
1218 &rqst,
1219 &sess_data->buf0_type,
1220 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1221 cifs_small_buf_release(sess_data->iov[0].iov_base);
1222 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1223
1224 return rc;
1225}
1226
1227static int
1228SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1229{
1230 int rc = 0;
1231 struct cifs_ses *ses = sess_data->ses;
1232 struct TCP_Server_Info *server = cifs_ses_server(ses);
1233
1234 mutex_lock(&server->srv_mutex);
1235 if (server->ops->generate_signingkey) {
1236 rc = server->ops->generate_signingkey(ses);
1237 if (rc) {
1238 cifs_dbg(FYI,
1239 "SMB3 session key generation failed\n");
1240 mutex_unlock(&server->srv_mutex);
1241 return rc;
1242 }
1243 }
1244 if (!server->session_estab) {
1245 server->sequence_number = 0x2;
1246 server->session_estab = true;
1247 }
1248 mutex_unlock(&server->srv_mutex);
1249
1250 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1251 /* keep existing ses state if binding */
1252 if (!ses->binding) {
1253 spin_lock(&GlobalMid_Lock);
1254 ses->status = CifsGood;
1255 ses->need_reconnect = false;
1256 spin_unlock(&GlobalMid_Lock);
1257 }
1258
1259 return rc;
1260}
1261
1262#ifdef CONFIG_CIFS_UPCALL
1263static void
1264SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1265{
1266 int rc;
1267 struct cifs_ses *ses = sess_data->ses;
1268 struct cifs_spnego_msg *msg;
1269 struct key *spnego_key = NULL;
1270 struct smb2_sess_setup_rsp *rsp = NULL;
1271
1272 rc = SMB2_sess_alloc_buffer(sess_data);
1273 if (rc)
1274 goto out;
1275
1276 spnego_key = cifs_get_spnego_key(ses);
1277 if (IS_ERR(spnego_key)) {
1278 rc = PTR_ERR(spnego_key);
1279 if (rc == -ENOKEY)
1280 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1281 spnego_key = NULL;
1282 goto out;
1283 }
1284
1285 msg = spnego_key->payload.data[0];
1286 /*
1287 * check version field to make sure that cifs.upcall is
1288 * sending us a response in an expected form
1289 */
1290 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1291 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1292 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1293 rc = -EKEYREJECTED;
1294 goto out_put_spnego_key;
1295 }
1296
1297 /* keep session key if binding */
1298 if (!ses->binding) {
1299 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1300 GFP_KERNEL);
1301 if (!ses->auth_key.response) {
1302 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1303 msg->sesskey_len);
1304 rc = -ENOMEM;
1305 goto out_put_spnego_key;
1306 }
1307 ses->auth_key.len = msg->sesskey_len;
1308 }
1309
1310 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1311 sess_data->iov[1].iov_len = msg->secblob_len;
1312
1313 rc = SMB2_sess_sendreceive(sess_data);
1314 if (rc)
1315 goto out_put_spnego_key;
1316
1317 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1318 /* keep session id and flags if binding */
1319 if (!ses->binding) {
1320 ses->Suid = rsp->sync_hdr.SessionId;
1321 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1322 }
1323
1324 rc = SMB2_sess_establish_session(sess_data);
1325out_put_spnego_key:
1326 key_invalidate(spnego_key);
1327 key_put(spnego_key);
1328out:
1329 sess_data->result = rc;
1330 sess_data->func = NULL;
1331 SMB2_sess_free_buffer(sess_data);
1332}
1333#else
1334static void
1335SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1336{
1337 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1338 sess_data->result = -EOPNOTSUPP;
1339 sess_data->func = NULL;
1340}
1341#endif
1342
1343static void
1344SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1345
1346static void
1347SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1348{
1349 int rc;
1350 struct cifs_ses *ses = sess_data->ses;
1351 struct smb2_sess_setup_rsp *rsp = NULL;
1352 char *ntlmssp_blob = NULL;
1353 bool use_spnego = false; /* else use raw ntlmssp */
1354 u16 blob_length = 0;
1355
1356 /*
1357 * If memory allocation is successful, caller of this function
1358 * frees it.
1359 */
1360 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1361 if (!ses->ntlmssp) {
1362 rc = -ENOMEM;
1363 goto out_err;
1364 }
1365 ses->ntlmssp->sesskey_per_smbsess = true;
1366
1367 rc = SMB2_sess_alloc_buffer(sess_data);
1368 if (rc)
1369 goto out_err;
1370
1371 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1372 GFP_KERNEL);
1373 if (ntlmssp_blob == NULL) {
1374 rc = -ENOMEM;
1375 goto out;
1376 }
1377
1378 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1379 if (use_spnego) {
1380 /* BB eventually need to add this */
1381 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1382 rc = -EOPNOTSUPP;
1383 goto out;
1384 } else {
1385 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1386 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1387 }
1388 sess_data->iov[1].iov_base = ntlmssp_blob;
1389 sess_data->iov[1].iov_len = blob_length;
1390
1391 rc = SMB2_sess_sendreceive(sess_data);
1392 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1393
1394 /* If true, rc here is expected and not an error */
1395 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1396 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1397 rc = 0;
1398
1399 if (rc)
1400 goto out;
1401
1402 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1403 le16_to_cpu(rsp->SecurityBufferOffset)) {
1404 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1405 le16_to_cpu(rsp->SecurityBufferOffset));
1406 rc = -EIO;
1407 goto out;
1408 }
1409 rc = decode_ntlmssp_challenge(rsp->Buffer,
1410 le16_to_cpu(rsp->SecurityBufferLength), ses);
1411 if (rc)
1412 goto out;
1413
1414 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1415
1416 /* keep existing ses id and flags if binding */
1417 if (!ses->binding) {
1418 ses->Suid = rsp->sync_hdr.SessionId;
1419 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1420 }
1421
1422out:
1423 kfree(ntlmssp_blob);
1424 SMB2_sess_free_buffer(sess_data);
1425 if (!rc) {
1426 sess_data->result = 0;
1427 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1428 return;
1429 }
1430out_err:
1431 kfree(ses->ntlmssp);
1432 ses->ntlmssp = NULL;
1433 sess_data->result = rc;
1434 sess_data->func = NULL;
1435}
1436
1437static void
1438SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1439{
1440 int rc;
1441 struct cifs_ses *ses = sess_data->ses;
1442 struct smb2_sess_setup_req *req;
1443 struct smb2_sess_setup_rsp *rsp = NULL;
1444 unsigned char *ntlmssp_blob = NULL;
1445 bool use_spnego = false; /* else use raw ntlmssp */
1446 u16 blob_length = 0;
1447
1448 rc = SMB2_sess_alloc_buffer(sess_data);
1449 if (rc)
1450 goto out;
1451
1452 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1453 req->sync_hdr.SessionId = ses->Suid;
1454
1455 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1456 sess_data->nls_cp);
1457 if (rc) {
1458 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1459 goto out;
1460 }
1461
1462 if (use_spnego) {
1463 /* BB eventually need to add this */
1464 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1465 rc = -EOPNOTSUPP;
1466 goto out;
1467 }
1468 sess_data->iov[1].iov_base = ntlmssp_blob;
1469 sess_data->iov[1].iov_len = blob_length;
1470
1471 rc = SMB2_sess_sendreceive(sess_data);
1472 if (rc)
1473 goto out;
1474
1475 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1476
1477 /* keep existing ses id and flags if binding */
1478 if (!ses->binding) {
1479 ses->Suid = rsp->sync_hdr.SessionId;
1480 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1481 }
1482
1483 rc = SMB2_sess_establish_session(sess_data);
1484#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1485 if (ses->server->dialect < SMB30_PROT_ID) {
1486 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1487 /*
1488 * The session id is opaque in terms of endianness, so we can't
1489 * print it as a long long. we dump it as we got it on the wire
1490 */
1491 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
1492 &ses->Suid);
1493 cifs_dbg(VFS, "Session Key %*ph\n",
1494 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1495 cifs_dbg(VFS, "Signing Key %*ph\n",
1496 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1497 }
1498#endif
1499out:
1500 kfree(ntlmssp_blob);
1501 SMB2_sess_free_buffer(sess_data);
1502 kfree(ses->ntlmssp);
1503 ses->ntlmssp = NULL;
1504 sess_data->result = rc;
1505 sess_data->func = NULL;
1506}
1507
1508static int
1509SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1510{
1511 int type;
1512
1513 type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1514 cifs_dbg(FYI, "sess setup type %d\n", type);
1515 if (type == Unspecified) {
1516 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1517 return -EINVAL;
1518 }
1519
1520 switch (type) {
1521 case Kerberos:
1522 sess_data->func = SMB2_auth_kerberos;
1523 break;
1524 case RawNTLMSSP:
1525 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1526 break;
1527 default:
1528 cifs_dbg(VFS, "secType %d not supported!\n", type);
1529 return -EOPNOTSUPP;
1530 }
1531
1532 return 0;
1533}
1534
1535int
1536SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1537 const struct nls_table *nls_cp)
1538{
1539 int rc = 0;
1540 struct TCP_Server_Info *server = cifs_ses_server(ses);
1541 struct SMB2_sess_data *sess_data;
1542
1543 cifs_dbg(FYI, "Session Setup\n");
1544
1545 if (!server) {
1546 WARN(1, "%s: server is NULL!\n", __func__);
1547 return -EIO;
1548 }
1549
1550 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1551 if (!sess_data)
1552 return -ENOMEM;
1553
1554 rc = SMB2_select_sec(ses, sess_data);
1555 if (rc)
1556 goto out;
1557 sess_data->xid = xid;
1558 sess_data->ses = ses;
1559 sess_data->buf0_type = CIFS_NO_BUFFER;
1560 sess_data->nls_cp = (struct nls_table *) nls_cp;
1561 sess_data->previous_session = ses->Suid;
1562
1563 /*
1564 * Initialize the session hash with the server one.
1565 */
1566 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1567 SMB2_PREAUTH_HASH_SIZE);
1568
1569 while (sess_data->func)
1570 sess_data->func(sess_data);
1571
1572 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1573 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1574 rc = sess_data->result;
1575out:
1576 kfree(sess_data);
1577 return rc;
1578}
1579
1580int
1581SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1582{
1583 struct smb_rqst rqst;
1584 struct smb2_logoff_req *req; /* response is also trivial struct */
1585 int rc = 0;
1586 struct TCP_Server_Info *server;
1587 int flags = 0;
1588 unsigned int total_len;
1589 struct kvec iov[1];
1590 struct kvec rsp_iov;
1591 int resp_buf_type;
1592
1593 cifs_dbg(FYI, "disconnect session %p\n", ses);
1594
1595 if (ses && (ses->server))
1596 server = ses->server;
1597 else
1598 return -EIO;
1599
1600 /* no need to send SMB logoff if uid already closed due to reconnect */
1601 if (ses->need_reconnect)
1602 goto smb2_session_already_dead;
1603
1604 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1605 (void **) &req, &total_len);
1606 if (rc)
1607 return rc;
1608
1609 /* since no tcon, smb2_init can not do this, so do here */
1610 req->sync_hdr.SessionId = ses->Suid;
1611
1612 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1613 flags |= CIFS_TRANSFORM_REQ;
1614 else if (server->sign)
1615 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1616
1617 flags |= CIFS_NO_RSP_BUF;
1618
1619 iov[0].iov_base = (char *)req;
1620 iov[0].iov_len = total_len;
1621
1622 memset(&rqst, 0, sizeof(struct smb_rqst));
1623 rqst.rq_iov = iov;
1624 rqst.rq_nvec = 1;
1625
1626 rc = cifs_send_recv(xid, ses, ses->server,
1627 &rqst, &resp_buf_type, flags, &rsp_iov);
1628 cifs_small_buf_release(req);
1629 /*
1630 * No tcon so can't do
1631 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1632 */
1633
1634smb2_session_already_dead:
1635 return rc;
1636}
1637
1638static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1639{
1640 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1641}
1642
1643#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1644
1645/* These are similar values to what Windows uses */
1646static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1647{
1648 tcon->max_chunks = 256;
1649 tcon->max_bytes_chunk = 1048576;
1650 tcon->max_bytes_copy = 16777216;
1651}
1652
1653int
1654SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1655 struct cifs_tcon *tcon, const struct nls_table *cp)
1656{
1657 struct smb_rqst rqst;
1658 struct smb2_tree_connect_req *req;
1659 struct smb2_tree_connect_rsp *rsp = NULL;
1660 struct kvec iov[2];
1661 struct kvec rsp_iov = { NULL, 0 };
1662 int rc = 0;
1663 int resp_buftype;
1664 int unc_path_len;
1665 __le16 *unc_path = NULL;
1666 int flags = 0;
1667 unsigned int total_len;
1668 struct TCP_Server_Info *server;
1669
1670 /* always use master channel */
1671 server = ses->server;
1672
1673 cifs_dbg(FYI, "TCON\n");
1674
1675 if (!server || !tree)
1676 return -EIO;
1677
1678 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1679 if (unc_path == NULL)
1680 return -ENOMEM;
1681
1682 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1683 unc_path_len *= 2;
1684 if (unc_path_len < 2) {
1685 kfree(unc_path);
1686 return -EINVAL;
1687 }
1688
1689 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1690 tcon->tid = 0;
1691 atomic_set(&tcon->num_remote_opens, 0);
1692 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1693 (void **) &req, &total_len);
1694 if (rc) {
1695 kfree(unc_path);
1696 return rc;
1697 }
1698
1699 if (smb3_encryption_required(tcon))
1700 flags |= CIFS_TRANSFORM_REQ;
1701
1702 iov[0].iov_base = (char *)req;
1703 /* 1 for pad */
1704 iov[0].iov_len = total_len - 1;
1705
1706 /* Testing shows that buffer offset must be at location of Buffer[0] */
1707 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1708 - 1 /* pad */);
1709 req->PathLength = cpu_to_le16(unc_path_len - 2);
1710 iov[1].iov_base = unc_path;
1711 iov[1].iov_len = unc_path_len;
1712
1713 /*
1714 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1715 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1716 * (Samba servers don't always set the flag so also check if null user)
1717 */
1718 if ((server->dialect == SMB311_PROT_ID) &&
1719 !smb3_encryption_required(tcon) &&
1720 !(ses->session_flags &
1721 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1722 ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1723 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1724
1725 memset(&rqst, 0, sizeof(struct smb_rqst));
1726 rqst.rq_iov = iov;
1727 rqst.rq_nvec = 2;
1728
1729 /* Need 64 for max size write so ask for more in case not there yet */
1730 req->sync_hdr.CreditRequest = cpu_to_le16(64);
1731
1732 rc = cifs_send_recv(xid, ses, server,
1733 &rqst, &resp_buftype, flags, &rsp_iov);
1734 cifs_small_buf_release(req);
1735 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1736 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1737 if (rc != 0) {
1738 if (tcon) {
1739 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1740 tcon->need_reconnect = true;
1741 }
1742 goto tcon_error_exit;
1743 }
1744
1745 switch (rsp->ShareType) {
1746 case SMB2_SHARE_TYPE_DISK:
1747 cifs_dbg(FYI, "connection to disk share\n");
1748 break;
1749 case SMB2_SHARE_TYPE_PIPE:
1750 tcon->pipe = true;
1751 cifs_dbg(FYI, "connection to pipe share\n");
1752 break;
1753 case SMB2_SHARE_TYPE_PRINT:
1754 tcon->print = true;
1755 cifs_dbg(FYI, "connection to printer\n");
1756 break;
1757 default:
1758 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1759 rc = -EOPNOTSUPP;
1760 goto tcon_error_exit;
1761 }
1762
1763 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1764 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1765 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1766 tcon->tidStatus = CifsGood;
1767 tcon->need_reconnect = false;
1768 tcon->tid = rsp->sync_hdr.TreeId;
1769 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1770
1771 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1772 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1773 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1774
1775 if (tcon->seal &&
1776 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1777 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1778
1779 init_copy_chunk_defaults(tcon);
1780 if (server->ops->validate_negotiate)
1781 rc = server->ops->validate_negotiate(xid, tcon);
1782tcon_exit:
1783
1784 free_rsp_buf(resp_buftype, rsp);
1785 kfree(unc_path);
1786 return rc;
1787
1788tcon_error_exit:
1789 if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1790 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1791 }
1792 goto tcon_exit;
1793}
1794
1795int
1796SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1797{
1798 struct smb_rqst rqst;
1799 struct smb2_tree_disconnect_req *req; /* response is trivial */
1800 int rc = 0;
1801 struct cifs_ses *ses = tcon->ses;
1802 int flags = 0;
1803 unsigned int total_len;
1804 struct kvec iov[1];
1805 struct kvec rsp_iov;
1806 int resp_buf_type;
1807
1808 cifs_dbg(FYI, "Tree Disconnect\n");
1809
1810 if (!ses || !(ses->server))
1811 return -EIO;
1812
1813 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1814 return 0;
1815
1816 close_shroot_lease(&tcon->crfid);
1817
1818 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1819 (void **) &req,
1820 &total_len);
1821 if (rc)
1822 return rc;
1823
1824 if (smb3_encryption_required(tcon))
1825 flags |= CIFS_TRANSFORM_REQ;
1826
1827 flags |= CIFS_NO_RSP_BUF;
1828
1829 iov[0].iov_base = (char *)req;
1830 iov[0].iov_len = total_len;
1831
1832 memset(&rqst, 0, sizeof(struct smb_rqst));
1833 rqst.rq_iov = iov;
1834 rqst.rq_nvec = 1;
1835
1836 rc = cifs_send_recv(xid, ses, ses->server,
1837 &rqst, &resp_buf_type, flags, &rsp_iov);
1838 cifs_small_buf_release(req);
1839 if (rc)
1840 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1841
1842 return rc;
1843}
1844
1845
1846static struct create_durable *
1847create_durable_buf(void)
1848{
1849 struct create_durable *buf;
1850
1851 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1852 if (!buf)
1853 return NULL;
1854
1855 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1856 (struct create_durable, Data));
1857 buf->ccontext.DataLength = cpu_to_le32(16);
1858 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1859 (struct create_durable, Name));
1860 buf->ccontext.NameLength = cpu_to_le16(4);
1861 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1862 buf->Name[0] = 'D';
1863 buf->Name[1] = 'H';
1864 buf->Name[2] = 'n';
1865 buf->Name[3] = 'Q';
1866 return buf;
1867}
1868
1869static struct create_durable *
1870create_reconnect_durable_buf(struct cifs_fid *fid)
1871{
1872 struct create_durable *buf;
1873
1874 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1875 if (!buf)
1876 return NULL;
1877
1878 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1879 (struct create_durable, Data));
1880 buf->ccontext.DataLength = cpu_to_le32(16);
1881 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1882 (struct create_durable, Name));
1883 buf->ccontext.NameLength = cpu_to_le16(4);
1884 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1885 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1886 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1887 buf->Name[0] = 'D';
1888 buf->Name[1] = 'H';
1889 buf->Name[2] = 'n';
1890 buf->Name[3] = 'C';
1891 return buf;
1892}
1893
1894static void
1895parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1896{
1897 struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1898
1899 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1900 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1901 buf->IndexNumber = pdisk_id->DiskFileId;
1902}
1903
1904static void
1905parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1906 struct create_posix_rsp *posix)
1907{
1908 int sid_len;
1909 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1910 u8 *end = beg + le32_to_cpu(cc->DataLength);
1911 u8 *sid;
1912
1913 memset(posix, 0, sizeof(*posix));
1914
1915 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1916 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1917 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1918
1919 sid = beg + 12;
1920 sid_len = posix_info_sid_size(sid, end);
1921 if (sid_len < 0) {
1922 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1923 return;
1924 }
1925 memcpy(&posix->owner, sid, sid_len);
1926
1927 sid = sid + sid_len;
1928 sid_len = posix_info_sid_size(sid, end);
1929 if (sid_len < 0) {
1930 cifs_dbg(VFS, "bad group sid in posix create response\n");
1931 return;
1932 }
1933 memcpy(&posix->group, sid, sid_len);
1934
1935 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1936 posix->nlink, posix->mode, posix->reparse_tag);
1937}
1938
1939void
1940smb2_parse_contexts(struct TCP_Server_Info *server,
1941 struct smb2_create_rsp *rsp,
1942 unsigned int *epoch, char *lease_key, __u8 *oplock,
1943 struct smb2_file_all_info *buf,
1944 struct create_posix_rsp *posix)
1945{
1946 char *data_offset;
1947 struct create_context *cc;
1948 unsigned int next;
1949 unsigned int remaining;
1950 char *name;
1951 const char smb3_create_tag_posix[] = {0x93, 0xAD, 0x25, 0x50, 0x9C,
1952 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
1953 0xDE, 0x96, 0x8B, 0xCD, 0x7C};
1954
1955 *oplock = 0;
1956 data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1957 remaining = le32_to_cpu(rsp->CreateContextsLength);
1958 cc = (struct create_context *)data_offset;
1959
1960 /* Initialize inode number to 0 in case no valid data in qfid context */
1961 if (buf)
1962 buf->IndexNumber = 0;
1963
1964 while (remaining >= sizeof(struct create_context)) {
1965 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1966 if (le16_to_cpu(cc->NameLength) == 4 &&
1967 strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1968 *oplock = server->ops->parse_lease_buf(cc, epoch,
1969 lease_key);
1970 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1971 strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1972 parse_query_id_ctxt(cc, buf);
1973 else if ((le16_to_cpu(cc->NameLength) == 16)) {
1974 if (posix &&
1975 memcmp(name, smb3_create_tag_posix, 16) == 0)
1976 parse_posix_ctxt(cc, buf, posix);
1977 }
1978 /* else {
1979 cifs_dbg(FYI, "Context not matched with len %d\n",
1980 le16_to_cpu(cc->NameLength));
1981 cifs_dump_mem("Cctxt name: ", name, 4);
1982 } */
1983
1984 next = le32_to_cpu(cc->Next);
1985 if (!next)
1986 break;
1987 remaining -= next;
1988 cc = (struct create_context *)((char *)cc + next);
1989 }
1990
1991 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1992 *oplock = rsp->OplockLevel;
1993
1994 return;
1995}
1996
1997static int
1998add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1999 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2000{
2001 struct smb2_create_req *req = iov[0].iov_base;
2002 unsigned int num = *num_iovec;
2003
2004 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2005 if (iov[num].iov_base == NULL)
2006 return -ENOMEM;
2007 iov[num].iov_len = server->vals->create_lease_size;
2008 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2009 if (!req->CreateContextsOffset)
2010 req->CreateContextsOffset = cpu_to_le32(
2011 sizeof(struct smb2_create_req) +
2012 iov[num - 1].iov_len);
2013 le32_add_cpu(&req->CreateContextsLength,
2014 server->vals->create_lease_size);
2015 *num_iovec = num + 1;
2016 return 0;
2017}
2018
2019static struct create_durable_v2 *
2020create_durable_v2_buf(struct cifs_open_parms *oparms)
2021{
2022 struct cifs_fid *pfid = oparms->fid;
2023 struct create_durable_v2 *buf;
2024
2025 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2026 if (!buf)
2027 return NULL;
2028
2029 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2030 (struct create_durable_v2, dcontext));
2031 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2032 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2033 (struct create_durable_v2, Name));
2034 buf->ccontext.NameLength = cpu_to_le16(4);
2035
2036 /*
2037 * NB: Handle timeout defaults to 0, which allows server to choose
2038 * (most servers default to 120 seconds) and most clients default to 0.
2039 * This can be overridden at mount ("handletimeout=") if the user wants
2040 * a different persistent (or resilient) handle timeout for all opens
2041 * opens on a particular SMB3 mount.
2042 */
2043 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2044 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2045 generate_random_uuid(buf->dcontext.CreateGuid);
2046 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2047
2048 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2049 buf->Name[0] = 'D';
2050 buf->Name[1] = 'H';
2051 buf->Name[2] = '2';
2052 buf->Name[3] = 'Q';
2053 return buf;
2054}
2055
2056static struct create_durable_handle_reconnect_v2 *
2057create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2058{
2059 struct create_durable_handle_reconnect_v2 *buf;
2060
2061 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2062 GFP_KERNEL);
2063 if (!buf)
2064 return NULL;
2065
2066 buf->ccontext.DataOffset =
2067 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2068 dcontext));
2069 buf->ccontext.DataLength =
2070 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2071 buf->ccontext.NameOffset =
2072 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2073 Name));
2074 buf->ccontext.NameLength = cpu_to_le16(4);
2075
2076 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2077 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2078 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2079 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2080
2081 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2082 buf->Name[0] = 'D';
2083 buf->Name[1] = 'H';
2084 buf->Name[2] = '2';
2085 buf->Name[3] = 'C';
2086 return buf;
2087}
2088
2089static int
2090add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2091 struct cifs_open_parms *oparms)
2092{
2093 struct smb2_create_req *req = iov[0].iov_base;
2094 unsigned int num = *num_iovec;
2095
2096 iov[num].iov_base = create_durable_v2_buf(oparms);
2097 if (iov[num].iov_base == NULL)
2098 return -ENOMEM;
2099 iov[num].iov_len = sizeof(struct create_durable_v2);
2100 if (!req->CreateContextsOffset)
2101 req->CreateContextsOffset =
2102 cpu_to_le32(sizeof(struct smb2_create_req) +
2103 iov[1].iov_len);
2104 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2105 *num_iovec = num + 1;
2106 return 0;
2107}
2108
2109static int
2110add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2111 struct cifs_open_parms *oparms)
2112{
2113 struct smb2_create_req *req = iov[0].iov_base;
2114 unsigned int num = *num_iovec;
2115
2116 /* indicate that we don't need to relock the file */
2117 oparms->reconnect = false;
2118
2119 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2120 if (iov[num].iov_base == NULL)
2121 return -ENOMEM;
2122 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2123 if (!req->CreateContextsOffset)
2124 req->CreateContextsOffset =
2125 cpu_to_le32(sizeof(struct smb2_create_req) +
2126 iov[1].iov_len);
2127 le32_add_cpu(&req->CreateContextsLength,
2128 sizeof(struct create_durable_handle_reconnect_v2));
2129 *num_iovec = num + 1;
2130 return 0;
2131}
2132
2133static int
2134add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2135 struct cifs_open_parms *oparms, bool use_persistent)
2136{
2137 struct smb2_create_req *req = iov[0].iov_base;
2138 unsigned int num = *num_iovec;
2139
2140 if (use_persistent) {
2141 if (oparms->reconnect)
2142 return add_durable_reconnect_v2_context(iov, num_iovec,
2143 oparms);
2144 else
2145 return add_durable_v2_context(iov, num_iovec, oparms);
2146 }
2147
2148 if (oparms->reconnect) {
2149 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2150 /* indicate that we don't need to relock the file */
2151 oparms->reconnect = false;
2152 } else
2153 iov[num].iov_base = create_durable_buf();
2154 if (iov[num].iov_base == NULL)
2155 return -ENOMEM;
2156 iov[num].iov_len = sizeof(struct create_durable);
2157 if (!req->CreateContextsOffset)
2158 req->CreateContextsOffset =
2159 cpu_to_le32(sizeof(struct smb2_create_req) +
2160 iov[1].iov_len);
2161 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2162 *num_iovec = num + 1;
2163 return 0;
2164}
2165
2166/* See MS-SMB2 2.2.13.2.7 */
2167static struct crt_twarp_ctxt *
2168create_twarp_buf(__u64 timewarp)
2169{
2170 struct crt_twarp_ctxt *buf;
2171
2172 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2173 if (!buf)
2174 return NULL;
2175
2176 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2177 (struct crt_twarp_ctxt, Timestamp));
2178 buf->ccontext.DataLength = cpu_to_le32(8);
2179 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2180 (struct crt_twarp_ctxt, Name));
2181 buf->ccontext.NameLength = cpu_to_le16(4);
2182 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2183 buf->Name[0] = 'T';
2184 buf->Name[1] = 'W';
2185 buf->Name[2] = 'r';
2186 buf->Name[3] = 'p';
2187 buf->Timestamp = cpu_to_le64(timewarp);
2188 return buf;
2189}
2190
2191/* See MS-SMB2 2.2.13.2.7 */
2192static int
2193add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2194{
2195 struct smb2_create_req *req = iov[0].iov_base;
2196 unsigned int num = *num_iovec;
2197
2198 iov[num].iov_base = create_twarp_buf(timewarp);
2199 if (iov[num].iov_base == NULL)
2200 return -ENOMEM;
2201 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2202 if (!req->CreateContextsOffset)
2203 req->CreateContextsOffset = cpu_to_le32(
2204 sizeof(struct smb2_create_req) +
2205 iov[num - 1].iov_len);
2206 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2207 *num_iovec = num + 1;
2208 return 0;
2209}
2210
2211/* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2212static void setup_owner_group_sids(char *buf)
2213{
2214 struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2215
2216 /* Populate the user ownership fields S-1-5-88-1 */
2217 sids->owner.Revision = 1;
2218 sids->owner.NumAuth = 3;
2219 sids->owner.Authority[5] = 5;
2220 sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2221 sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2222 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2223
2224 /* Populate the group ownership fields S-1-5-88-2 */
2225 sids->group.Revision = 1;
2226 sids->group.NumAuth = 3;
2227 sids->group.Authority[5] = 5;
2228 sids->group.SubAuthorities[0] = cpu_to_le32(88);
2229 sids->group.SubAuthorities[1] = cpu_to_le32(2);
2230 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2231
2232 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2233}
2234
2235/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2236static struct crt_sd_ctxt *
2237create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2238{
2239 struct crt_sd_ctxt *buf;
2240 struct cifs_ace *pace;
2241 unsigned int sdlen, acelen;
2242 unsigned int owner_offset = 0;
2243 unsigned int group_offset = 0;
2244
2245 *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 2), 8);
2246
2247 if (set_owner) {
2248 /* offset fields are from beginning of security descriptor not of create context */
2249 owner_offset = sizeof(struct smb3_acl) + (sizeof(struct cifs_ace) * 2);
2250
2251 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2252 *len += sizeof(struct owner_group_sids);
2253 }
2254
2255 buf = kzalloc(*len, GFP_KERNEL);
2256 if (buf == NULL)
2257 return buf;
2258
2259 if (set_owner) {
2260 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2261 group_offset = owner_offset + sizeof(struct owner_sid);
2262 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2263 } else {
2264 buf->sd.OffsetOwner = 0;
2265 buf->sd.OffsetGroup = 0;
2266 }
2267
2268 sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2269 2 * sizeof(struct cifs_ace);
2270 if (set_owner) {
2271 sdlen += sizeof(struct owner_group_sids);
2272 setup_owner_group_sids(owner_offset + sizeof(struct create_context) + 8 /* name */
2273 + (char *)buf);
2274 }
2275
2276 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2277 (struct crt_sd_ctxt, sd));
2278 buf->ccontext.DataLength = cpu_to_le32(sdlen);
2279 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2280 buf->ccontext.NameLength = cpu_to_le16(4);
2281 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2282 buf->Name[0] = 'S';
2283 buf->Name[1] = 'e';
2284 buf->Name[2] = 'c';
2285 buf->Name[3] = 'D';
2286 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
2287 /*
2288 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2289 * and "DP" ie the DACL is present
2290 */
2291 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2292
2293 /* offset owner, group and Sbz1 and SACL are all zero */
2294 buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2295 buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2296
2297 /* create one ACE to hold the mode embedded in reserved special SID */
2298 pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2299 acelen = setup_special_mode_ACE(pace, (__u64)mode);
2300
2301 if (set_owner) {
2302 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2303 pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) + (char *)buf));
2304 acelen += setup_special_user_owner_ACE(pace);
2305 /* it does not appear necessary to add an ACE for the NFS group SID */
2306 buf->acl.AceCount = cpu_to_le16(3);
2307 } else
2308 buf->acl.AceCount = cpu_to_le16(2);
2309
2310 /* and one more ACE to allow access for authenticated users */
2311 pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2312 (char *)buf));
2313 acelen += setup_authusers_ACE(pace);
2314
2315 buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2316
2317 return buf;
2318}
2319
2320static int
2321add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2322{
2323 struct smb2_create_req *req = iov[0].iov_base;
2324 unsigned int num = *num_iovec;
2325 unsigned int len = 0;
2326
2327 iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2328 if (iov[num].iov_base == NULL)
2329 return -ENOMEM;
2330 iov[num].iov_len = len;
2331 if (!req->CreateContextsOffset)
2332 req->CreateContextsOffset = cpu_to_le32(
2333 sizeof(struct smb2_create_req) +
2334 iov[num - 1].iov_len);
2335 le32_add_cpu(&req->CreateContextsLength, len);
2336 *num_iovec = num + 1;
2337 return 0;
2338}
2339
2340static struct crt_query_id_ctxt *
2341create_query_id_buf(void)
2342{
2343 struct crt_query_id_ctxt *buf;
2344
2345 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2346 if (!buf)
2347 return NULL;
2348
2349 buf->ccontext.DataOffset = cpu_to_le16(0);
2350 buf->ccontext.DataLength = cpu_to_le32(0);
2351 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2352 (struct crt_query_id_ctxt, Name));
2353 buf->ccontext.NameLength = cpu_to_le16(4);
2354 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2355 buf->Name[0] = 'Q';
2356 buf->Name[1] = 'F';
2357 buf->Name[2] = 'i';
2358 buf->Name[3] = 'd';
2359 return buf;
2360}
2361
2362/* See MS-SMB2 2.2.13.2.9 */
2363static int
2364add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2365{
2366 struct smb2_create_req *req = iov[0].iov_base;
2367 unsigned int num = *num_iovec;
2368
2369 iov[num].iov_base = create_query_id_buf();
2370 if (iov[num].iov_base == NULL)
2371 return -ENOMEM;
2372 iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2373 if (!req->CreateContextsOffset)
2374 req->CreateContextsOffset = cpu_to_le32(
2375 sizeof(struct smb2_create_req) +
2376 iov[num - 1].iov_len);
2377 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2378 *num_iovec = num + 1;
2379 return 0;
2380}
2381
2382static int
2383alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2384 const char *treename, const __le16 *path)
2385{
2386 int treename_len, path_len;
2387 struct nls_table *cp;
2388 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2389
2390 /*
2391 * skip leading "\\"
2392 */
2393 treename_len = strlen(treename);
2394 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2395 return -EINVAL;
2396
2397 treename += 2;
2398 treename_len -= 2;
2399
2400 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2401
2402 /*
2403 * make room for one path separator between the treename and
2404 * path
2405 */
2406 *out_len = treename_len + 1 + path_len;
2407
2408 /*
2409 * final path needs to be null-terminated UTF16 with a
2410 * size aligned to 8
2411 */
2412
2413 *out_size = roundup((*out_len+1)*2, 8);
2414 *out_path = kzalloc(*out_size, GFP_KERNEL);
2415 if (!*out_path)
2416 return -ENOMEM;
2417
2418 cp = load_nls_default();
2419 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2420 UniStrcat(*out_path, sep);
2421 UniStrcat(*out_path, path);
2422 unload_nls(cp);
2423
2424 return 0;
2425}
2426
2427int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2428 umode_t mode, struct cifs_tcon *tcon,
2429 const char *full_path,
2430 struct cifs_sb_info *cifs_sb)
2431{
2432 struct smb_rqst rqst;
2433 struct smb2_create_req *req;
2434 struct smb2_create_rsp *rsp = NULL;
2435 struct cifs_ses *ses = tcon->ses;
2436 struct kvec iov[3]; /* make sure at least one for each open context */
2437 struct kvec rsp_iov = {NULL, 0};
2438 int resp_buftype;
2439 int uni_path_len;
2440 __le16 *copy_path = NULL;
2441 int copy_size;
2442 int rc = 0;
2443 unsigned int n_iov = 2;
2444 __u32 file_attributes = 0;
2445 char *pc_buf = NULL;
2446 int flags = 0;
2447 unsigned int total_len;
2448 __le16 *utf16_path = NULL;
2449 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2450
2451 cifs_dbg(FYI, "mkdir\n");
2452
2453 /* resource #1: path allocation */
2454 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2455 if (!utf16_path)
2456 return -ENOMEM;
2457
2458 if (!ses || !server) {
2459 rc = -EIO;
2460 goto err_free_path;
2461 }
2462
2463 /* resource #2: request */
2464 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2465 (void **) &req, &total_len);
2466 if (rc)
2467 goto err_free_path;
2468
2469
2470 if (smb3_encryption_required(tcon))
2471 flags |= CIFS_TRANSFORM_REQ;
2472
2473 req->ImpersonationLevel = IL_IMPERSONATION;
2474 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2475 /* File attributes ignored on open (used in create though) */
2476 req->FileAttributes = cpu_to_le32(file_attributes);
2477 req->ShareAccess = FILE_SHARE_ALL_LE;
2478 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2479 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2480
2481 iov[0].iov_base = (char *)req;
2482 /* -1 since last byte is buf[0] which is sent below (path) */
2483 iov[0].iov_len = total_len - 1;
2484
2485 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2486
2487 /* [MS-SMB2] 2.2.13 NameOffset:
2488 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2489 * the SMB2 header, the file name includes a prefix that will
2490 * be processed during DFS name normalization as specified in
2491 * section 3.3.5.9. Otherwise, the file name is relative to
2492 * the share that is identified by the TreeId in the SMB2
2493 * header.
2494 */
2495 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2496 int name_len;
2497
2498 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2499 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2500 &name_len,
2501 tcon->treeName, utf16_path);
2502 if (rc)
2503 goto err_free_req;
2504
2505 req->NameLength = cpu_to_le16(name_len * 2);
2506 uni_path_len = copy_size;
2507 /* free before overwriting resource */
2508 kfree(utf16_path);
2509 utf16_path = copy_path;
2510 } else {
2511 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2512 /* MUST set path len (NameLength) to 0 opening root of share */
2513 req->NameLength = cpu_to_le16(uni_path_len - 2);
2514 if (uni_path_len % 8 != 0) {
2515 copy_size = roundup(uni_path_len, 8);
2516 copy_path = kzalloc(copy_size, GFP_KERNEL);
2517 if (!copy_path) {
2518 rc = -ENOMEM;
2519 goto err_free_req;
2520 }
2521 memcpy((char *)copy_path, (const char *)utf16_path,
2522 uni_path_len);
2523 uni_path_len = copy_size;
2524 /* free before overwriting resource */
2525 kfree(utf16_path);
2526 utf16_path = copy_path;
2527 }
2528 }
2529
2530 iov[1].iov_len = uni_path_len;
2531 iov[1].iov_base = utf16_path;
2532 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2533
2534 if (tcon->posix_extensions) {
2535 /* resource #3: posix buf */
2536 rc = add_posix_context(iov, &n_iov, mode);
2537 if (rc)
2538 goto err_free_req;
2539 pc_buf = iov[n_iov-1].iov_base;
2540 }
2541
2542
2543 memset(&rqst, 0, sizeof(struct smb_rqst));
2544 rqst.rq_iov = iov;
2545 rqst.rq_nvec = n_iov;
2546
2547 /* no need to inc num_remote_opens because we close it just below */
2548 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2549 FILE_WRITE_ATTRIBUTES);
2550 /* resource #4: response buffer */
2551 rc = cifs_send_recv(xid, ses, server,
2552 &rqst, &resp_buftype, flags, &rsp_iov);
2553 if (rc) {
2554 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2555 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2556 CREATE_NOT_FILE,
2557 FILE_WRITE_ATTRIBUTES, rc);
2558 goto err_free_rsp_buf;
2559 }
2560
2561 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2562 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2563 ses->Suid, CREATE_NOT_FILE,
2564 FILE_WRITE_ATTRIBUTES);
2565
2566 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2567
2568 /* Eventually save off posix specific response info and timestaps */
2569
2570err_free_rsp_buf:
2571 free_rsp_buf(resp_buftype, rsp);
2572 kfree(pc_buf);
2573err_free_req:
2574 cifs_small_buf_release(req);
2575err_free_path:
2576 kfree(utf16_path);
2577 return rc;
2578}
2579
2580int
2581SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2582 struct smb_rqst *rqst, __u8 *oplock,
2583 struct cifs_open_parms *oparms, __le16 *path)
2584{
2585 struct smb2_create_req *req;
2586 unsigned int n_iov = 2;
2587 __u32 file_attributes = 0;
2588 int copy_size;
2589 int uni_path_len;
2590 unsigned int total_len;
2591 struct kvec *iov = rqst->rq_iov;
2592 __le16 *copy_path;
2593 int rc;
2594
2595 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2596 (void **) &req, &total_len);
2597 if (rc)
2598 return rc;
2599
2600 iov[0].iov_base = (char *)req;
2601 /* -1 since last byte is buf[0] which is sent below (path) */
2602 iov[0].iov_len = total_len - 1;
2603
2604 if (oparms->create_options & CREATE_OPTION_READONLY)
2605 file_attributes |= ATTR_READONLY;
2606 if (oparms->create_options & CREATE_OPTION_SPECIAL)
2607 file_attributes |= ATTR_SYSTEM;
2608
2609 req->ImpersonationLevel = IL_IMPERSONATION;
2610 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2611 /* File attributes ignored on open (used in create though) */
2612 req->FileAttributes = cpu_to_le32(file_attributes);
2613 req->ShareAccess = FILE_SHARE_ALL_LE;
2614
2615 req->CreateDisposition = cpu_to_le32(oparms->disposition);
2616 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2617 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2618
2619 /* [MS-SMB2] 2.2.13 NameOffset:
2620 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2621 * the SMB2 header, the file name includes a prefix that will
2622 * be processed during DFS name normalization as specified in
2623 * section 3.3.5.9. Otherwise, the file name is relative to
2624 * the share that is identified by the TreeId in the SMB2
2625 * header.
2626 */
2627 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2628 int name_len;
2629
2630 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2631 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2632 &name_len,
2633 tcon->treeName, path);
2634 if (rc)
2635 return rc;
2636 req->NameLength = cpu_to_le16(name_len * 2);
2637 uni_path_len = copy_size;
2638 path = copy_path;
2639 } else {
2640 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2641 /* MUST set path len (NameLength) to 0 opening root of share */
2642 req->NameLength = cpu_to_le16(uni_path_len - 2);
2643 copy_size = uni_path_len;
2644 if (copy_size % 8 != 0)
2645 copy_size = roundup(copy_size, 8);
2646 copy_path = kzalloc(copy_size, GFP_KERNEL);
2647 if (!copy_path)
2648 return -ENOMEM;
2649 memcpy((char *)copy_path, (const char *)path,
2650 uni_path_len);
2651 uni_path_len = copy_size;
2652 path = copy_path;
2653 }
2654
2655 iov[1].iov_len = uni_path_len;
2656 iov[1].iov_base = path;
2657
2658 if ((!server->oplocks) || (tcon->no_lease))
2659 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2660
2661 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2662 *oplock == SMB2_OPLOCK_LEVEL_NONE)
2663 req->RequestedOplockLevel = *oplock;
2664 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2665 (oparms->create_options & CREATE_NOT_FILE))
2666 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2667 else {
2668 rc = add_lease_context(server, iov, &n_iov,
2669 oparms->fid->lease_key, oplock);
2670 if (rc)
2671 return rc;
2672 }
2673
2674 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2675 /* need to set Next field of lease context if we request it */
2676 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2677 struct create_context *ccontext =
2678 (struct create_context *)iov[n_iov-1].iov_base;
2679 ccontext->Next =
2680 cpu_to_le32(server->vals->create_lease_size);
2681 }
2682
2683 rc = add_durable_context(iov, &n_iov, oparms,
2684 tcon->use_persistent);
2685 if (rc)
2686 return rc;
2687 }
2688
2689 if (tcon->posix_extensions) {
2690 if (n_iov > 2) {
2691 struct create_context *ccontext =
2692 (struct create_context *)iov[n_iov-1].iov_base;
2693 ccontext->Next =
2694 cpu_to_le32(iov[n_iov-1].iov_len);
2695 }
2696
2697 rc = add_posix_context(iov, &n_iov, oparms->mode);
2698 if (rc)
2699 return rc;
2700 }
2701
2702 if (tcon->snapshot_time) {
2703 cifs_dbg(FYI, "adding snapshot context\n");
2704 if (n_iov > 2) {
2705 struct create_context *ccontext =
2706 (struct create_context *)iov[n_iov-1].iov_base;
2707 ccontext->Next =
2708 cpu_to_le32(iov[n_iov-1].iov_len);
2709 }
2710
2711 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2712 if (rc)
2713 return rc;
2714 }
2715
2716 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2717 bool set_mode;
2718 bool set_owner;
2719
2720 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2721 (oparms->mode != ACL_NO_MODE))
2722 set_mode = true;
2723 else {
2724 set_mode = false;
2725 oparms->mode = ACL_NO_MODE;
2726 }
2727
2728 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2729 set_owner = true;
2730 else
2731 set_owner = false;
2732
2733 if (set_owner | set_mode) {
2734 if (n_iov > 2) {
2735 struct create_context *ccontext =
2736 (struct create_context *)iov[n_iov-1].iov_base;
2737 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2738 }
2739
2740 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2741 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2742 if (rc)
2743 return rc;
2744 }
2745 }
2746
2747 if (n_iov > 2) {
2748 struct create_context *ccontext =
2749 (struct create_context *)iov[n_iov-1].iov_base;
2750 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2751 }
2752 add_query_id_context(iov, &n_iov);
2753
2754 rqst->rq_nvec = n_iov;
2755 return 0;
2756}
2757
2758/* rq_iov[0] is the request and is released by cifs_small_buf_release().
2759 * All other vectors are freed by kfree().
2760 */
2761void
2762SMB2_open_free(struct smb_rqst *rqst)
2763{
2764 int i;
2765
2766 if (rqst && rqst->rq_iov) {
2767 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2768 for (i = 1; i < rqst->rq_nvec; i++)
2769 if (rqst->rq_iov[i].iov_base != smb2_padding)
2770 kfree(rqst->rq_iov[i].iov_base);
2771 }
2772}
2773
2774int
2775SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2776 __u8 *oplock, struct smb2_file_all_info *buf,
2777 struct create_posix_rsp *posix,
2778 struct kvec *err_iov, int *buftype)
2779{
2780 struct smb_rqst rqst;
2781 struct smb2_create_rsp *rsp = NULL;
2782 struct cifs_tcon *tcon = oparms->tcon;
2783 struct cifs_ses *ses = tcon->ses;
2784 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2785 struct kvec iov[SMB2_CREATE_IOV_SIZE];
2786 struct kvec rsp_iov = {NULL, 0};
2787 int resp_buftype = CIFS_NO_BUFFER;
2788 int rc = 0;
2789 int flags = 0;
2790
2791 cifs_dbg(FYI, "create/open\n");
2792 if (!ses || !server)
2793 return -EIO;
2794
2795 if (smb3_encryption_required(tcon))
2796 flags |= CIFS_TRANSFORM_REQ;
2797
2798 memset(&rqst, 0, sizeof(struct smb_rqst));
2799 memset(&iov, 0, sizeof(iov));
2800 rqst.rq_iov = iov;
2801 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2802
2803 rc = SMB2_open_init(tcon, server,
2804 &rqst, oplock, oparms, path);
2805 if (rc)
2806 goto creat_exit;
2807
2808 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2809 oparms->create_options, oparms->desired_access);
2810
2811 rc = cifs_send_recv(xid, ses, server,
2812 &rqst, &resp_buftype, flags,
2813 &rsp_iov);
2814 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2815
2816 if (rc != 0) {
2817 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2818 if (err_iov && rsp) {
2819 *err_iov = rsp_iov;
2820 *buftype = resp_buftype;
2821 resp_buftype = CIFS_NO_BUFFER;
2822 rsp = NULL;
2823 }
2824 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2825 oparms->create_options, oparms->desired_access, rc);
2826 if (rc == -EREMCHG) {
2827 pr_warn_once("server share %s deleted\n",
2828 tcon->treeName);
2829 tcon->need_reconnect = true;
2830 }
2831 goto creat_exit;
2832 } else
2833 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2834 ses->Suid, oparms->create_options,
2835 oparms->desired_access);
2836
2837 atomic_inc(&tcon->num_remote_opens);
2838 oparms->fid->persistent_fid = rsp->PersistentFileId;
2839 oparms->fid->volatile_fid = rsp->VolatileFileId;
2840 oparms->fid->access = oparms->desired_access;
2841#ifdef CONFIG_CIFS_DEBUG2
2842 oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2843#endif /* CIFS_DEBUG2 */
2844
2845 if (buf) {
2846 memcpy(buf, &rsp->CreationTime, 32);
2847 buf->AllocationSize = rsp->AllocationSize;
2848 buf->EndOfFile = rsp->EndofFile;
2849 buf->Attributes = rsp->FileAttributes;
2850 buf->NumberOfLinks = cpu_to_le32(1);
2851 buf->DeletePending = 0;
2852 }
2853
2854
2855 smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2856 oparms->fid->lease_key, oplock, buf, posix);
2857creat_exit:
2858 SMB2_open_free(&rqst);
2859 free_rsp_buf(resp_buftype, rsp);
2860 return rc;
2861}
2862
2863int
2864SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2865 struct smb_rqst *rqst,
2866 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2867 bool is_fsctl, char *in_data, u32 indatalen,
2868 __u32 max_response_size)
2869{
2870 struct smb2_ioctl_req *req;
2871 struct kvec *iov = rqst->rq_iov;
2872 unsigned int total_len;
2873 int rc;
2874 char *in_data_buf;
2875
2876 rc = smb2_ioctl_req_init(opcode, tcon, server,
2877 (void **) &req, &total_len);
2878 if (rc)
2879 return rc;
2880
2881 if (indatalen) {
2882 /*
2883 * indatalen is usually small at a couple of bytes max, so
2884 * just allocate through generic pool
2885 */
2886 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2887 if (!in_data_buf) {
2888 cifs_small_buf_release(req);
2889 return -ENOMEM;
2890 }
2891 }
2892
2893 req->CtlCode = cpu_to_le32(opcode);
2894 req->PersistentFileId = persistent_fid;
2895 req->VolatileFileId = volatile_fid;
2896
2897 iov[0].iov_base = (char *)req;
2898 /*
2899 * If no input data, the size of ioctl struct in
2900 * protocol spec still includes a 1 byte data buffer,
2901 * but if input data passed to ioctl, we do not
2902 * want to double count this, so we do not send
2903 * the dummy one byte of data in iovec[0] if sending
2904 * input data (in iovec[1]).
2905 */
2906 if (indatalen) {
2907 req->InputCount = cpu_to_le32(indatalen);
2908 /* do not set InputOffset if no input data */
2909 req->InputOffset =
2910 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2911 rqst->rq_nvec = 2;
2912 iov[0].iov_len = total_len - 1;
2913 iov[1].iov_base = in_data_buf;
2914 iov[1].iov_len = indatalen;
2915 } else {
2916 rqst->rq_nvec = 1;
2917 iov[0].iov_len = total_len;
2918 }
2919
2920 req->OutputOffset = 0;
2921 req->OutputCount = 0; /* MBZ */
2922
2923 /*
2924 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2925 * We Could increase default MaxOutputResponse, but that could require
2926 * more credits. Windows typically sets this smaller, but for some
2927 * ioctls it may be useful to allow server to send more. No point
2928 * limiting what the server can send as long as fits in one credit
2929 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2930 * to increase this limit up in the future.
2931 * Note that for snapshot queries that servers like Azure expect that
2932 * the first query be minimal size (and just used to get the number/size
2933 * of previous versions) so response size must be specified as EXACTLY
2934 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2935 * of eight bytes. Currently that is the only case where we set max
2936 * response size smaller.
2937 */
2938 req->MaxOutputResponse = cpu_to_le32(max_response_size);
2939 req->sync_hdr.CreditCharge =
2940 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2941 SMB2_MAX_BUFFER_SIZE));
2942 if (is_fsctl)
2943 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2944 else
2945 req->Flags = 0;
2946
2947 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2948 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2949 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2950
2951 return 0;
2952}
2953
2954void
2955SMB2_ioctl_free(struct smb_rqst *rqst)
2956{
2957 int i;
2958 if (rqst && rqst->rq_iov) {
2959 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2960 for (i = 1; i < rqst->rq_nvec; i++)
2961 if (rqst->rq_iov[i].iov_base != smb2_padding)
2962 kfree(rqst->rq_iov[i].iov_base);
2963 }
2964}
2965
2966
2967/*
2968 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
2969 */
2970int
2971SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2972 u64 volatile_fid, u32 opcode, bool is_fsctl,
2973 char *in_data, u32 indatalen, u32 max_out_data_len,
2974 char **out_data, u32 *plen /* returned data len */)
2975{
2976 struct smb_rqst rqst;
2977 struct smb2_ioctl_rsp *rsp = NULL;
2978 struct cifs_ses *ses;
2979 struct TCP_Server_Info *server;
2980 struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2981 struct kvec rsp_iov = {NULL, 0};
2982 int resp_buftype = CIFS_NO_BUFFER;
2983 int rc = 0;
2984 int flags = 0;
2985
2986 cifs_dbg(FYI, "SMB2 IOCTL\n");
2987
2988 if (out_data != NULL)
2989 *out_data = NULL;
2990
2991 /* zero out returned data len, in case of error */
2992 if (plen)
2993 *plen = 0;
2994
2995 if (!tcon)
2996 return -EIO;
2997
2998 ses = tcon->ses;
2999 if (!ses)
3000 return -EIO;
3001
3002 server = cifs_pick_channel(ses);
3003 if (!server)
3004 return -EIO;
3005
3006 if (smb3_encryption_required(tcon))
3007 flags |= CIFS_TRANSFORM_REQ;
3008
3009 memset(&rqst, 0, sizeof(struct smb_rqst));
3010 memset(&iov, 0, sizeof(iov));
3011 rqst.rq_iov = iov;
3012 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3013
3014 rc = SMB2_ioctl_init(tcon, server,
3015 &rqst, persistent_fid, volatile_fid, opcode,
3016 is_fsctl, in_data, indatalen, max_out_data_len);
3017 if (rc)
3018 goto ioctl_exit;
3019
3020 rc = cifs_send_recv(xid, ses, server,
3021 &rqst, &resp_buftype, flags,
3022 &rsp_iov);
3023 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3024
3025 if (rc != 0)
3026 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3027 ses->Suid, 0, opcode, rc);
3028
3029 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3030 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3031 goto ioctl_exit;
3032 } else if (rc == -EINVAL) {
3033 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3034 (opcode != FSCTL_SRV_COPYCHUNK)) {
3035 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3036 goto ioctl_exit;
3037 }
3038 } else if (rc == -E2BIG) {
3039 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3040 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3041 goto ioctl_exit;
3042 }
3043 }
3044
3045 /* check if caller wants to look at return data or just return rc */
3046 if ((plen == NULL) || (out_data == NULL))
3047 goto ioctl_exit;
3048
3049 *plen = le32_to_cpu(rsp->OutputCount);
3050
3051 /* We check for obvious errors in the output buffer length and offset */
3052 if (*plen == 0)
3053 goto ioctl_exit; /* server returned no data */
3054 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3055 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3056 *plen = 0;
3057 rc = -EIO;
3058 goto ioctl_exit;
3059 }
3060
3061 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3062 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3063 le32_to_cpu(rsp->OutputOffset));
3064 *plen = 0;
3065 rc = -EIO;
3066 goto ioctl_exit;
3067 }
3068
3069 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3070 *plen, GFP_KERNEL);
3071 if (*out_data == NULL) {
3072 rc = -ENOMEM;
3073 goto ioctl_exit;
3074 }
3075
3076ioctl_exit:
3077 SMB2_ioctl_free(&rqst);
3078 free_rsp_buf(resp_buftype, rsp);
3079 return rc;
3080}
3081
3082/*
3083 * Individual callers to ioctl worker function follow
3084 */
3085
3086int
3087SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3088 u64 persistent_fid, u64 volatile_fid)
3089{
3090 int rc;
3091 struct compress_ioctl fsctl_input;
3092 char *ret_data = NULL;
3093
3094 fsctl_input.CompressionState =
3095 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3096
3097 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3098 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3099 (char *)&fsctl_input /* data input */,
3100 2 /* in data len */, CIFSMaxBufSize /* max out data */,
3101 &ret_data /* out data */, NULL);
3102
3103 cifs_dbg(FYI, "set compression rc %d\n", rc);
3104
3105 return rc;
3106}
3107
3108int
3109SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3110 struct smb_rqst *rqst,
3111 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3112{
3113 struct smb2_close_req *req;
3114 struct kvec *iov = rqst->rq_iov;
3115 unsigned int total_len;
3116 int rc;
3117
3118 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3119 (void **) &req, &total_len);
3120 if (rc)
3121 return rc;
3122
3123 req->PersistentFileId = persistent_fid;
3124 req->VolatileFileId = volatile_fid;
3125 if (query_attrs)
3126 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3127 else
3128 req->Flags = 0;
3129 iov[0].iov_base = (char *)req;
3130 iov[0].iov_len = total_len;
3131
3132 return 0;
3133}
3134
3135void
3136SMB2_close_free(struct smb_rqst *rqst)
3137{
3138 if (rqst && rqst->rq_iov)
3139 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3140}
3141
3142int
3143__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3144 u64 persistent_fid, u64 volatile_fid,
3145 struct smb2_file_network_open_info *pbuf)
3146{
3147 struct smb_rqst rqst;
3148 struct smb2_close_rsp *rsp = NULL;
3149 struct cifs_ses *ses = tcon->ses;
3150 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3151 struct kvec iov[1];
3152 struct kvec rsp_iov;
3153 int resp_buftype = CIFS_NO_BUFFER;
3154 int rc = 0;
3155 int flags = 0;
3156 bool query_attrs = false;
3157
3158 cifs_dbg(FYI, "Close\n");
3159
3160 if (!ses || !server)
3161 return -EIO;
3162
3163 if (smb3_encryption_required(tcon))
3164 flags |= CIFS_TRANSFORM_REQ;
3165
3166 memset(&rqst, 0, sizeof(struct smb_rqst));
3167 memset(&iov, 0, sizeof(iov));
3168 rqst.rq_iov = iov;
3169 rqst.rq_nvec = 1;
3170
3171 /* check if need to ask server to return timestamps in close response */
3172 if (pbuf)
3173 query_attrs = true;
3174
3175 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3176 rc = SMB2_close_init(tcon, server,
3177 &rqst, persistent_fid, volatile_fid,
3178 query_attrs);
3179 if (rc)
3180 goto close_exit;
3181
3182 rc = cifs_send_recv(xid, ses, server,
3183 &rqst, &resp_buftype, flags, &rsp_iov);
3184 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3185
3186 if (rc != 0) {
3187 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3188 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3189 rc);
3190 goto close_exit;
3191 } else {
3192 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3193 ses->Suid);
3194 /*
3195 * Note that have to subtract 4 since struct network_open_info
3196 * has a final 4 byte pad that close response does not have
3197 */
3198 if (pbuf)
3199 memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3200 }
3201
3202 atomic_dec(&tcon->num_remote_opens);
3203close_exit:
3204 SMB2_close_free(&rqst);
3205 free_rsp_buf(resp_buftype, rsp);
3206
3207 /* retry close in a worker thread if this one is interrupted */
3208 if (rc == -EINTR) {
3209 int tmp_rc;
3210
3211 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3212 volatile_fid);
3213 if (tmp_rc)
3214 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3215 persistent_fid, tmp_rc);
3216 }
3217 return rc;
3218}
3219
3220int
3221SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3222 u64 persistent_fid, u64 volatile_fid)
3223{
3224 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3225}
3226
3227int
3228smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3229 struct kvec *iov, unsigned int min_buf_size)
3230{
3231 unsigned int smb_len = iov->iov_len;
3232 char *end_of_smb = smb_len + (char *)iov->iov_base;
3233 char *begin_of_buf = offset + (char *)iov->iov_base;
3234 char *end_of_buf = begin_of_buf + buffer_length;
3235
3236
3237 if (buffer_length < min_buf_size) {
3238 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3239 buffer_length, min_buf_size);
3240 return -EINVAL;
3241 }
3242
3243 /* check if beyond RFC1001 maximum length */
3244 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3245 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3246 buffer_length, smb_len);
3247 return -EINVAL;
3248 }
3249
3250 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3251 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3252 return -EINVAL;
3253 }
3254
3255 return 0;
3256}
3257
3258/*
3259 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3260 * Caller must free buffer.
3261 */
3262int
3263smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3264 struct kvec *iov, unsigned int minbufsize,
3265 char *data)
3266{
3267 char *begin_of_buf = offset + (char *)iov->iov_base;
3268 int rc;
3269
3270 if (!data)
3271 return -EINVAL;
3272
3273 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3274 if (rc)
3275 return rc;
3276
3277 memcpy(data, begin_of_buf, buffer_length);
3278
3279 return 0;
3280}
3281
3282int
3283SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3284 struct smb_rqst *rqst,
3285 u64 persistent_fid, u64 volatile_fid,
3286 u8 info_class, u8 info_type, u32 additional_info,
3287 size_t output_len, size_t input_len, void *input)
3288{
3289 struct smb2_query_info_req *req;
3290 struct kvec *iov = rqst->rq_iov;
3291 unsigned int total_len;
3292 int rc;
3293
3294 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3295 (void **) &req, &total_len);
3296 if (rc)
3297 return rc;
3298
3299 req->InfoType = info_type;
3300 req->FileInfoClass = info_class;
3301 req->PersistentFileId = persistent_fid;
3302 req->VolatileFileId = volatile_fid;
3303 req->AdditionalInformation = cpu_to_le32(additional_info);
3304
3305 req->OutputBufferLength = cpu_to_le32(output_len);
3306 if (input_len) {
3307 req->InputBufferLength = cpu_to_le32(input_len);
3308 /* total_len for smb query request never close to le16 max */
3309 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3310 memcpy(req->Buffer, input, input_len);
3311 }
3312
3313 iov[0].iov_base = (char *)req;
3314 /* 1 for Buffer */
3315 iov[0].iov_len = total_len - 1 + input_len;
3316 return 0;
3317}
3318
3319void
3320SMB2_query_info_free(struct smb_rqst *rqst)
3321{
3322 if (rqst && rqst->rq_iov)
3323 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3324}
3325
3326static int
3327query_info(const unsigned int xid, struct cifs_tcon *tcon,
3328 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3329 u32 additional_info, size_t output_len, size_t min_len, void **data,
3330 u32 *dlen)
3331{
3332 struct smb_rqst rqst;
3333 struct smb2_query_info_rsp *rsp = NULL;
3334 struct kvec iov[1];
3335 struct kvec rsp_iov;
3336 int rc = 0;
3337 int resp_buftype = CIFS_NO_BUFFER;
3338 struct cifs_ses *ses = tcon->ses;
3339 struct TCP_Server_Info *server;
3340 int flags = 0;
3341 bool allocated = false;
3342
3343 cifs_dbg(FYI, "Query Info\n");
3344
3345 if (!ses)
3346 return -EIO;
3347 server = cifs_pick_channel(ses);
3348 if (!server)
3349 return -EIO;
3350
3351 if (smb3_encryption_required(tcon))
3352 flags |= CIFS_TRANSFORM_REQ;
3353
3354 memset(&rqst, 0, sizeof(struct smb_rqst));
3355 memset(&iov, 0, sizeof(iov));
3356 rqst.rq_iov = iov;
3357 rqst.rq_nvec = 1;
3358
3359 rc = SMB2_query_info_init(tcon, server,
3360 &rqst, persistent_fid, volatile_fid,
3361 info_class, info_type, additional_info,
3362 output_len, 0, NULL);
3363 if (rc)
3364 goto qinf_exit;
3365
3366 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3367 ses->Suid, info_class, (__u32)info_type);
3368
3369 rc = cifs_send_recv(xid, ses, server,
3370 &rqst, &resp_buftype, flags, &rsp_iov);
3371 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3372
3373 if (rc) {
3374 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3375 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3376 ses->Suid, info_class, (__u32)info_type, rc);
3377 goto qinf_exit;
3378 }
3379
3380 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3381 ses->Suid, info_class, (__u32)info_type);
3382
3383 if (dlen) {
3384 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3385 if (!*data) {
3386 *data = kmalloc(*dlen, GFP_KERNEL);
3387 if (!*data) {
3388 cifs_tcon_dbg(VFS,
3389 "Error %d allocating memory for acl\n",
3390 rc);
3391 *dlen = 0;
3392 rc = -ENOMEM;
3393 goto qinf_exit;
3394 }
3395 allocated = true;
3396 }
3397 }
3398
3399 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3400 le32_to_cpu(rsp->OutputBufferLength),
3401 &rsp_iov, min_len, *data);
3402 if (rc && allocated) {
3403 kfree(*data);
3404 *data = NULL;
3405 *dlen = 0;
3406 }
3407
3408qinf_exit:
3409 SMB2_query_info_free(&rqst);
3410 free_rsp_buf(resp_buftype, rsp);
3411 return rc;
3412}
3413
3414int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3415 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3416{
3417 return query_info(xid, tcon, persistent_fid, volatile_fid,
3418 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3419 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3420 sizeof(struct smb2_file_all_info), (void **)&data,
3421 NULL);
3422}
3423
3424int
3425SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3426 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3427{
3428 size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3429 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3430 *plen = 0;
3431
3432 return query_info(xid, tcon, persistent_fid, volatile_fid,
3433 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3434 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3435}
3436
3437int
3438SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3439 u64 persistent_fid, u64 volatile_fid,
3440 void **data, u32 *plen)
3441{
3442 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3443 *plen = 0;
3444
3445 return query_info(xid, tcon, persistent_fid, volatile_fid,
3446 0, SMB2_O_INFO_SECURITY, additional_info,
3447 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3448}
3449
3450int
3451SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3452 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3453{
3454 return query_info(xid, tcon, persistent_fid, volatile_fid,
3455 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3456 sizeof(struct smb2_file_internal_info),
3457 sizeof(struct smb2_file_internal_info),
3458 (void **)&uniqueid, NULL);
3459}
3460
3461/*
3462 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3463 * See MS-SMB2 2.2.35 and 2.2.36
3464 */
3465
3466static int
3467SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3468 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3469 u64 persistent_fid, u64 volatile_fid,
3470 u32 completion_filter, bool watch_tree)
3471{
3472 struct smb2_change_notify_req *req;
3473 struct kvec *iov = rqst->rq_iov;
3474 unsigned int total_len;
3475 int rc;
3476
3477 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3478 (void **) &req, &total_len);
3479 if (rc)
3480 return rc;
3481
3482 req->PersistentFileId = persistent_fid;
3483 req->VolatileFileId = volatile_fid;
3484 /* See note 354 of MS-SMB2, 64K max */
3485 req->OutputBufferLength =
3486 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3487 req->CompletionFilter = cpu_to_le32(completion_filter);
3488 if (watch_tree)
3489 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3490 else
3491 req->Flags = 0;
3492
3493 iov[0].iov_base = (char *)req;
3494 iov[0].iov_len = total_len;
3495
3496 return 0;
3497}
3498
3499int
3500SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3501 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3502 u32 completion_filter)
3503{
3504 struct cifs_ses *ses = tcon->ses;
3505 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3506 struct smb_rqst rqst;
3507 struct kvec iov[1];
3508 struct kvec rsp_iov = {NULL, 0};
3509 int resp_buftype = CIFS_NO_BUFFER;
3510 int flags = 0;
3511 int rc = 0;
3512
3513 cifs_dbg(FYI, "change notify\n");
3514 if (!ses || !server)
3515 return -EIO;
3516
3517 if (smb3_encryption_required(tcon))
3518 flags |= CIFS_TRANSFORM_REQ;
3519
3520 memset(&rqst, 0, sizeof(struct smb_rqst));
3521 memset(&iov, 0, sizeof(iov));
3522 rqst.rq_iov = iov;
3523 rqst.rq_nvec = 1;
3524
3525 rc = SMB2_notify_init(xid, &rqst, tcon, server,
3526 persistent_fid, volatile_fid,
3527 completion_filter, watch_tree);
3528 if (rc)
3529 goto cnotify_exit;
3530
3531 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3532 (u8)watch_tree, completion_filter);
3533 rc = cifs_send_recv(xid, ses, server,
3534 &rqst, &resp_buftype, flags, &rsp_iov);
3535
3536 if (rc != 0) {
3537 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3538 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3539 (u8)watch_tree, completion_filter, rc);
3540 } else
3541 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3542 ses->Suid, (u8)watch_tree, completion_filter);
3543
3544 cnotify_exit:
3545 if (rqst.rq_iov)
3546 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3547 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3548 return rc;
3549}
3550
3551
3552
3553/*
3554 * This is a no-op for now. We're not really interested in the reply, but
3555 * rather in the fact that the server sent one and that server->lstrp
3556 * gets updated.
3557 *
3558 * FIXME: maybe we should consider checking that the reply matches request?
3559 */
3560static void
3561smb2_echo_callback(struct mid_q_entry *mid)
3562{
3563 struct TCP_Server_Info *server = mid->callback_data;
3564 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3565 struct cifs_credits credits = { .value = 0, .instance = 0 };
3566
3567 if (mid->mid_state == MID_RESPONSE_RECEIVED
3568 || mid->mid_state == MID_RESPONSE_MALFORMED) {
3569 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3570 credits.instance = server->reconnect_instance;
3571 }
3572
3573 DeleteMidQEntry(mid);
3574 add_credits(server, &credits, CIFS_ECHO_OP);
3575}
3576
3577void smb2_reconnect_server(struct work_struct *work)
3578{
3579 struct TCP_Server_Info *server = container_of(work,
3580 struct TCP_Server_Info, reconnect.work);
3581 struct cifs_ses *ses;
3582 struct cifs_tcon *tcon, *tcon2;
3583 struct list_head tmp_list;
3584 int tcon_exist = false;
3585 int rc;
3586 int resched = false;
3587
3588
3589 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3590 mutex_lock(&server->reconnect_mutex);
3591
3592 INIT_LIST_HEAD(&tmp_list);
3593 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3594
3595 spin_lock(&cifs_tcp_ses_lock);
3596 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3597 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3598 if (tcon->need_reconnect || tcon->need_reopen_files) {
3599 tcon->tc_count++;
3600 list_add_tail(&tcon->rlist, &tmp_list);
3601 tcon_exist = true;
3602 }
3603 }
3604 /*
3605 * IPC has the same lifetime as its session and uses its
3606 * refcount.
3607 */
3608 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3609 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3610 tcon_exist = true;
3611 ses->ses_count++;
3612 }
3613 }
3614 /*
3615 * Get the reference to server struct to be sure that the last call of
3616 * cifs_put_tcon() in the loop below won't release the server pointer.
3617 */
3618 if (tcon_exist)
3619 server->srv_count++;
3620
3621 spin_unlock(&cifs_tcp_ses_lock);
3622
3623 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3624 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3625 if (!rc)
3626 cifs_reopen_persistent_handles(tcon);
3627 else
3628 resched = true;
3629 list_del_init(&tcon->rlist);
3630 if (tcon->ipc)
3631 cifs_put_smb_ses(tcon->ses);
3632 else
3633 cifs_put_tcon(tcon);
3634 }
3635
3636 cifs_dbg(FYI, "Reconnecting tcons finished\n");
3637 if (resched)
3638 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3639 mutex_unlock(&server->reconnect_mutex);
3640
3641 /* now we can safely release srv struct */
3642 if (tcon_exist)
3643 cifs_put_tcp_session(server, 1);
3644}
3645
3646int
3647SMB2_echo(struct TCP_Server_Info *server)
3648{
3649 struct smb2_echo_req *req;
3650 int rc = 0;
3651 struct kvec iov[1];
3652 struct smb_rqst rqst = { .rq_iov = iov,
3653 .rq_nvec = 1 };
3654 unsigned int total_len;
3655
3656 cifs_dbg(FYI, "In echo request\n");
3657
3658 if (server->tcpStatus == CifsNeedNegotiate) {
3659 /* No need to send echo on newly established connections */
3660 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3661 return rc;
3662 }
3663
3664 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3665 (void **)&req, &total_len);
3666 if (rc)
3667 return rc;
3668
3669 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3670
3671 iov[0].iov_len = total_len;
3672 iov[0].iov_base = (char *)req;
3673
3674 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3675 server, CIFS_ECHO_OP, NULL);
3676 if (rc)
3677 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3678
3679 cifs_small_buf_release(req);
3680 return rc;
3681}
3682
3683void
3684SMB2_flush_free(struct smb_rqst *rqst)
3685{
3686 if (rqst && rqst->rq_iov)
3687 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3688}
3689
3690int
3691SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3692 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3693 u64 persistent_fid, u64 volatile_fid)
3694{
3695 struct smb2_flush_req *req;
3696 struct kvec *iov = rqst->rq_iov;
3697 unsigned int total_len;
3698 int rc;
3699
3700 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3701 (void **) &req, &total_len);
3702 if (rc)
3703 return rc;
3704
3705 req->PersistentFileId = persistent_fid;
3706 req->VolatileFileId = volatile_fid;
3707
3708 iov[0].iov_base = (char *)req;
3709 iov[0].iov_len = total_len;
3710
3711 return 0;
3712}
3713
3714int
3715SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3716 u64 volatile_fid)
3717{
3718 struct cifs_ses *ses = tcon->ses;
3719 struct smb_rqst rqst;
3720 struct kvec iov[1];
3721 struct kvec rsp_iov = {NULL, 0};
3722 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3723 int resp_buftype = CIFS_NO_BUFFER;
3724 int flags = 0;
3725 int rc = 0;
3726
3727 cifs_dbg(FYI, "flush\n");
3728 if (!ses || !(ses->server))
3729 return -EIO;
3730
3731 if (smb3_encryption_required(tcon))
3732 flags |= CIFS_TRANSFORM_REQ;
3733
3734 memset(&rqst, 0, sizeof(struct smb_rqst));
3735 memset(&iov, 0, sizeof(iov));
3736 rqst.rq_iov = iov;
3737 rqst.rq_nvec = 1;
3738
3739 rc = SMB2_flush_init(xid, &rqst, tcon, server,
3740 persistent_fid, volatile_fid);
3741 if (rc)
3742 goto flush_exit;
3743
3744 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3745 rc = cifs_send_recv(xid, ses, server,
3746 &rqst, &resp_buftype, flags, &rsp_iov);
3747
3748 if (rc != 0) {
3749 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3750 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3751 rc);
3752 } else
3753 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3754 ses->Suid);
3755
3756 flush_exit:
3757 SMB2_flush_free(&rqst);
3758 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3759 return rc;
3760}
3761
3762/*
3763 * To form a chain of read requests, any read requests after the first should
3764 * have the end_of_chain boolean set to true.
3765 */
3766static int
3767smb2_new_read_req(void **buf, unsigned int *total_len,
3768 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3769 unsigned int remaining_bytes, int request_type)
3770{
3771 int rc = -EACCES;
3772 struct smb2_read_plain_req *req = NULL;
3773 struct smb2_sync_hdr *shdr;
3774 struct TCP_Server_Info *server = io_parms->server;
3775
3776 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3777 (void **) &req, total_len);
3778 if (rc)
3779 return rc;
3780
3781 if (server == NULL)
3782 return -ECONNABORTED;
3783
3784 shdr = &req->sync_hdr;
3785 shdr->ProcessId = cpu_to_le32(io_parms->pid);
3786
3787 req->PersistentFileId = io_parms->persistent_fid;
3788 req->VolatileFileId = io_parms->volatile_fid;
3789 req->ReadChannelInfoOffset = 0; /* reserved */
3790 req->ReadChannelInfoLength = 0; /* reserved */
3791 req->Channel = 0; /* reserved */
3792 req->MinimumCount = 0;
3793 req->Length = cpu_to_le32(io_parms->length);
3794 req->Offset = cpu_to_le64(io_parms->offset);
3795
3796 trace_smb3_read_enter(0 /* xid */,
3797 io_parms->persistent_fid,
3798 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3799 io_parms->offset, io_parms->length);
3800#ifdef CONFIG_CIFS_SMB_DIRECT
3801 /*
3802 * If we want to do a RDMA write, fill in and append
3803 * smbd_buffer_descriptor_v1 to the end of read request
3804 */
3805 if (server->rdma && rdata && !server->sign &&
3806 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3807
3808 struct smbd_buffer_descriptor_v1 *v1;
3809 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3810
3811 rdata->mr = smbd_register_mr(
3812 server->smbd_conn, rdata->pages,
3813 rdata->nr_pages, rdata->page_offset,
3814 rdata->tailsz, true, need_invalidate);
3815 if (!rdata->mr)
3816 return -EAGAIN;
3817
3818 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3819 if (need_invalidate)
3820 req->Channel = SMB2_CHANNEL_RDMA_V1;
3821 req->ReadChannelInfoOffset =
3822 cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3823 req->ReadChannelInfoLength =
3824 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3825 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3826 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3827 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3828 v1->length = cpu_to_le32(rdata->mr->mr->length);
3829
3830 *total_len += sizeof(*v1) - 1;
3831 }
3832#endif
3833 if (request_type & CHAINED_REQUEST) {
3834 if (!(request_type & END_OF_CHAIN)) {
3835 /* next 8-byte aligned request */
3836 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3837 shdr->NextCommand = cpu_to_le32(*total_len);
3838 } else /* END_OF_CHAIN */
3839 shdr->NextCommand = 0;
3840 if (request_type & RELATED_REQUEST) {
3841 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3842 /*
3843 * Related requests use info from previous read request
3844 * in chain.
3845 */
3846 shdr->SessionId = 0xFFFFFFFF;
3847 shdr->TreeId = 0xFFFFFFFF;
3848 req->PersistentFileId = 0xFFFFFFFF;
3849 req->VolatileFileId = 0xFFFFFFFF;
3850 }
3851 }
3852 if (remaining_bytes > io_parms->length)
3853 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3854 else
3855 req->RemainingBytes = 0;
3856
3857 *buf = req;
3858 return rc;
3859}
3860
3861static void
3862smb2_readv_callback(struct mid_q_entry *mid)
3863{
3864 struct cifs_readdata *rdata = mid->callback_data;
3865 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3866 struct TCP_Server_Info *server = rdata->server;
3867 struct smb2_sync_hdr *shdr =
3868 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3869 struct cifs_credits credits = { .value = 0, .instance = 0 };
3870 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3871 .rq_nvec = 1,
3872 .rq_pages = rdata->pages,
3873 .rq_offset = rdata->page_offset,
3874 .rq_npages = rdata->nr_pages,
3875 .rq_pagesz = rdata->pagesz,
3876 .rq_tailsz = rdata->tailsz };
3877
3878 WARN_ONCE(rdata->server != mid->server,
3879 "rdata server %p != mid server %p",
3880 rdata->server, mid->server);
3881
3882 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3883 __func__, mid->mid, mid->mid_state, rdata->result,
3884 rdata->bytes);
3885
3886 switch (mid->mid_state) {
3887 case MID_RESPONSE_RECEIVED:
3888 credits.value = le16_to_cpu(shdr->CreditRequest);
3889 credits.instance = server->reconnect_instance;
3890 /* result already set, check signature */
3891 if (server->sign && !mid->decrypted) {
3892 int rc;
3893
3894 rc = smb2_verify_signature(&rqst, server);
3895 if (rc)
3896 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3897 rc);
3898 }
3899 /* FIXME: should this be counted toward the initiating task? */
3900 task_io_account_read(rdata->got_bytes);
3901 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3902 break;
3903 case MID_REQUEST_SUBMITTED:
3904 case MID_RETRY_NEEDED:
3905 rdata->result = -EAGAIN;
3906 if (server->sign && rdata->got_bytes)
3907 /* reset bytes number since we can not check a sign */
3908 rdata->got_bytes = 0;
3909 /* FIXME: should this be counted toward the initiating task? */
3910 task_io_account_read(rdata->got_bytes);
3911 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3912 break;
3913 case MID_RESPONSE_MALFORMED:
3914 credits.value = le16_to_cpu(shdr->CreditRequest);
3915 credits.instance = server->reconnect_instance;
3916 fallthrough;
3917 default:
3918 rdata->result = -EIO;
3919 }
3920#ifdef CONFIG_CIFS_SMB_DIRECT
3921 /*
3922 * If this rdata has a memmory registered, the MR can be freed
3923 * MR needs to be freed as soon as I/O finishes to prevent deadlock
3924 * because they have limited number and are used for future I/Os
3925 */
3926 if (rdata->mr) {
3927 smbd_deregister_mr(rdata->mr);
3928 rdata->mr = NULL;
3929 }
3930#endif
3931 if (rdata->result && rdata->result != -ENODATA) {
3932 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3933 trace_smb3_read_err(0 /* xid */,
3934 rdata->cfile->fid.persistent_fid,
3935 tcon->tid, tcon->ses->Suid, rdata->offset,
3936 rdata->bytes, rdata->result);
3937 } else
3938 trace_smb3_read_done(0 /* xid */,
3939 rdata->cfile->fid.persistent_fid,
3940 tcon->tid, tcon->ses->Suid,
3941 rdata->offset, rdata->got_bytes);
3942
3943 queue_work(cifsiod_wq, &rdata->work);
3944 DeleteMidQEntry(mid);
3945 add_credits(server, &credits, 0);
3946}
3947
3948/* smb2_async_readv - send an async read, and set up mid to handle result */
3949int
3950smb2_async_readv(struct cifs_readdata *rdata)
3951{
3952 int rc, flags = 0;
3953 char *buf;
3954 struct smb2_sync_hdr *shdr;
3955 struct cifs_io_parms io_parms;
3956 struct smb_rqst rqst = { .rq_iov = rdata->iov,
3957 .rq_nvec = 1 };
3958 struct TCP_Server_Info *server;
3959 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3960 unsigned int total_len;
3961
3962 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3963 __func__, rdata->offset, rdata->bytes);
3964
3965 if (!rdata->server)
3966 rdata->server = cifs_pick_channel(tcon->ses);
3967
3968 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3969 io_parms.server = server = rdata->server;
3970 io_parms.offset = rdata->offset;
3971 io_parms.length = rdata->bytes;
3972 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3973 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3974 io_parms.pid = rdata->pid;
3975
3976 rc = smb2_new_read_req(
3977 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3978 if (rc)
3979 return rc;
3980
3981 if (smb3_encryption_required(io_parms.tcon))
3982 flags |= CIFS_TRANSFORM_REQ;
3983
3984 rdata->iov[0].iov_base = buf;
3985 rdata->iov[0].iov_len = total_len;
3986
3987 shdr = (struct smb2_sync_hdr *)buf;
3988
3989 if (rdata->credits.value > 0) {
3990 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3991 SMB2_MAX_BUFFER_SIZE));
3992 shdr->CreditRequest =
3993 cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3994
3995 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3996 if (rc)
3997 goto async_readv_out;
3998
3999 flags |= CIFS_HAS_CREDITS;
4000 }
4001
4002 kref_get(&rdata->refcount);
4003 rc = cifs_call_async(server, &rqst,
4004 cifs_readv_receive, smb2_readv_callback,
4005 smb3_handle_read_data, rdata, flags,
4006 &rdata->credits);
4007 if (rc) {
4008 kref_put(&rdata->refcount, cifs_readdata_release);
4009 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4010 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4011 io_parms.tcon->tid,
4012 io_parms.tcon->ses->Suid,
4013 io_parms.offset, io_parms.length, rc);
4014 }
4015
4016async_readv_out:
4017 cifs_small_buf_release(buf);
4018 return rc;
4019}
4020
4021int
4022SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4023 unsigned int *nbytes, char **buf, int *buf_type)
4024{
4025 struct smb_rqst rqst;
4026 int resp_buftype, rc;
4027 struct smb2_read_plain_req *req = NULL;
4028 struct smb2_read_rsp *rsp = NULL;
4029 struct kvec iov[1];
4030 struct kvec rsp_iov;
4031 unsigned int total_len;
4032 int flags = CIFS_LOG_ERROR;
4033 struct cifs_ses *ses = io_parms->tcon->ses;
4034
4035 if (!io_parms->server)
4036 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4037
4038 *nbytes = 0;
4039 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4040 if (rc)
4041 return rc;
4042
4043 if (smb3_encryption_required(io_parms->tcon))
4044 flags |= CIFS_TRANSFORM_REQ;
4045
4046 iov[0].iov_base = (char *)req;
4047 iov[0].iov_len = total_len;
4048
4049 memset(&rqst, 0, sizeof(struct smb_rqst));
4050 rqst.rq_iov = iov;
4051 rqst.rq_nvec = 1;
4052
4053 rc = cifs_send_recv(xid, ses, io_parms->server,
4054 &rqst, &resp_buftype, flags, &rsp_iov);
4055 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4056
4057 if (rc) {
4058 if (rc != -ENODATA) {
4059 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4060 cifs_dbg(VFS, "Send error in read = %d\n", rc);
4061 trace_smb3_read_err(xid, req->PersistentFileId,
4062 io_parms->tcon->tid, ses->Suid,
4063 io_parms->offset, io_parms->length,
4064 rc);
4065 } else
4066 trace_smb3_read_done(xid, req->PersistentFileId,
4067 io_parms->tcon->tid, ses->Suid,
4068 io_parms->offset, 0);
4069 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4070 cifs_small_buf_release(req);
4071 return rc == -ENODATA ? 0 : rc;
4072 } else
4073 trace_smb3_read_done(xid, req->PersistentFileId,
4074 io_parms->tcon->tid, ses->Suid,
4075 io_parms->offset, io_parms->length);
4076
4077 cifs_small_buf_release(req);
4078
4079 *nbytes = le32_to_cpu(rsp->DataLength);
4080 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4081 (*nbytes > io_parms->length)) {
4082 cifs_dbg(FYI, "bad length %d for count %d\n",
4083 *nbytes, io_parms->length);
4084 rc = -EIO;
4085 *nbytes = 0;
4086 }
4087
4088 if (*buf) {
4089 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4090 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4091 } else if (resp_buftype != CIFS_NO_BUFFER) {
4092 *buf = rsp_iov.iov_base;
4093 if (resp_buftype == CIFS_SMALL_BUFFER)
4094 *buf_type = CIFS_SMALL_BUFFER;
4095 else if (resp_buftype == CIFS_LARGE_BUFFER)
4096 *buf_type = CIFS_LARGE_BUFFER;
4097 }
4098 return rc;
4099}
4100
4101/*
4102 * Check the mid_state and signature on received buffer (if any), and queue the
4103 * workqueue completion task.
4104 */
4105static void
4106smb2_writev_callback(struct mid_q_entry *mid)
4107{
4108 struct cifs_writedata *wdata = mid->callback_data;
4109 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4110 struct TCP_Server_Info *server = wdata->server;
4111 unsigned int written;
4112 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4113 struct cifs_credits credits = { .value = 0, .instance = 0 };
4114
4115 WARN_ONCE(wdata->server != mid->server,
4116 "wdata server %p != mid server %p",
4117 wdata->server, mid->server);
4118
4119 switch (mid->mid_state) {
4120 case MID_RESPONSE_RECEIVED:
4121 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4122 credits.instance = server->reconnect_instance;
4123 wdata->result = smb2_check_receive(mid, server, 0);
4124 if (wdata->result != 0)
4125 break;
4126
4127 written = le32_to_cpu(rsp->DataLength);
4128 /*
4129 * Mask off high 16 bits when bytes written as returned
4130 * by the server is greater than bytes requested by the
4131 * client. OS/2 servers are known to set incorrect
4132 * CountHigh values.
4133 */
4134 if (written > wdata->bytes)
4135 written &= 0xFFFF;
4136
4137 if (written < wdata->bytes)
4138 wdata->result = -ENOSPC;
4139 else
4140 wdata->bytes = written;
4141 break;
4142 case MID_REQUEST_SUBMITTED:
4143 case MID_RETRY_NEEDED:
4144 wdata->result = -EAGAIN;
4145 break;
4146 case MID_RESPONSE_MALFORMED:
4147 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4148 credits.instance = server->reconnect_instance;
4149 fallthrough;
4150 default:
4151 wdata->result = -EIO;
4152 break;
4153 }
4154#ifdef CONFIG_CIFS_SMB_DIRECT
4155 /*
4156 * If this wdata has a memory registered, the MR can be freed
4157 * The number of MRs available is limited, it's important to recover
4158 * used MR as soon as I/O is finished. Hold MR longer in the later
4159 * I/O process can possibly result in I/O deadlock due to lack of MR
4160 * to send request on I/O retry
4161 */
4162 if (wdata->mr) {
4163 smbd_deregister_mr(wdata->mr);
4164 wdata->mr = NULL;
4165 }
4166#endif
4167 if (wdata->result) {
4168 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4169 trace_smb3_write_err(0 /* no xid */,
4170 wdata->cfile->fid.persistent_fid,
4171 tcon->tid, tcon->ses->Suid, wdata->offset,
4172 wdata->bytes, wdata->result);
4173 if (wdata->result == -ENOSPC)
4174 pr_warn_once("Out of space writing to %s\n",
4175 tcon->treeName);
4176 } else
4177 trace_smb3_write_done(0 /* no xid */,
4178 wdata->cfile->fid.persistent_fid,
4179 tcon->tid, tcon->ses->Suid,
4180 wdata->offset, wdata->bytes);
4181
4182 queue_work(cifsiod_wq, &wdata->work);
4183 DeleteMidQEntry(mid);
4184 add_credits(server, &credits, 0);
4185}
4186
4187/* smb2_async_writev - send an async write, and set up mid to handle result */
4188int
4189smb2_async_writev(struct cifs_writedata *wdata,
4190 void (*release)(struct kref *kref))
4191{
4192 int rc = -EACCES, flags = 0;
4193 struct smb2_write_req *req = NULL;
4194 struct smb2_sync_hdr *shdr;
4195 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4196 struct TCP_Server_Info *server = wdata->server;
4197 struct kvec iov[1];
4198 struct smb_rqst rqst = { };
4199 unsigned int total_len;
4200
4201 if (!wdata->server)
4202 server = wdata->server = cifs_pick_channel(tcon->ses);
4203
4204 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4205 (void **) &req, &total_len);
4206 if (rc)
4207 return rc;
4208
4209 if (smb3_encryption_required(tcon))
4210 flags |= CIFS_TRANSFORM_REQ;
4211
4212 shdr = (struct smb2_sync_hdr *)req;
4213 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4214
4215 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4216 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4217 req->WriteChannelInfoOffset = 0;
4218 req->WriteChannelInfoLength = 0;
4219 req->Channel = 0;
4220 req->Offset = cpu_to_le64(wdata->offset);
4221 req->DataOffset = cpu_to_le16(
4222 offsetof(struct smb2_write_req, Buffer));
4223 req->RemainingBytes = 0;
4224
4225 trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4226 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4227#ifdef CONFIG_CIFS_SMB_DIRECT
4228 /*
4229 * If we want to do a server RDMA read, fill in and append
4230 * smbd_buffer_descriptor_v1 to the end of write request
4231 */
4232 if (server->rdma && !server->sign && wdata->bytes >=
4233 server->smbd_conn->rdma_readwrite_threshold) {
4234
4235 struct smbd_buffer_descriptor_v1 *v1;
4236 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4237
4238 wdata->mr = smbd_register_mr(
4239 server->smbd_conn, wdata->pages,
4240 wdata->nr_pages, wdata->page_offset,
4241 wdata->tailsz, false, need_invalidate);
4242 if (!wdata->mr) {
4243 rc = -EAGAIN;
4244 goto async_writev_out;
4245 }
4246 req->Length = 0;
4247 req->DataOffset = 0;
4248 if (wdata->nr_pages > 1)
4249 req->RemainingBytes =
4250 cpu_to_le32(
4251 (wdata->nr_pages - 1) * wdata->pagesz -
4252 wdata->page_offset + wdata->tailsz
4253 );
4254 else
4255 req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4256 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4257 if (need_invalidate)
4258 req->Channel = SMB2_CHANNEL_RDMA_V1;
4259 req->WriteChannelInfoOffset =
4260 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4261 req->WriteChannelInfoLength =
4262 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4263 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4264 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4265 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4266 v1->length = cpu_to_le32(wdata->mr->mr->length);
4267 }
4268#endif
4269 iov[0].iov_len = total_len - 1;
4270 iov[0].iov_base = (char *)req;
4271
4272 rqst.rq_iov = iov;
4273 rqst.rq_nvec = 1;
4274 rqst.rq_pages = wdata->pages;
4275 rqst.rq_offset = wdata->page_offset;
4276 rqst.rq_npages = wdata->nr_pages;
4277 rqst.rq_pagesz = wdata->pagesz;
4278 rqst.rq_tailsz = wdata->tailsz;
4279#ifdef CONFIG_CIFS_SMB_DIRECT
4280 if (wdata->mr) {
4281 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4282 rqst.rq_npages = 0;
4283 }
4284#endif
4285 cifs_dbg(FYI, "async write at %llu %u bytes\n",
4286 wdata->offset, wdata->bytes);
4287
4288#ifdef CONFIG_CIFS_SMB_DIRECT
4289 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4290 if (!wdata->mr)
4291 req->Length = cpu_to_le32(wdata->bytes);
4292#else
4293 req->Length = cpu_to_le32(wdata->bytes);
4294#endif
4295
4296 if (wdata->credits.value > 0) {
4297 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4298 SMB2_MAX_BUFFER_SIZE));
4299 shdr->CreditRequest =
4300 cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4301
4302 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4303 if (rc)
4304 goto async_writev_out;
4305
4306 flags |= CIFS_HAS_CREDITS;
4307 }
4308
4309 kref_get(&wdata->refcount);
4310 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4311 wdata, flags, &wdata->credits);
4312
4313 if (rc) {
4314 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4315 tcon->tid, tcon->ses->Suid, wdata->offset,
4316 wdata->bytes, rc);
4317 kref_put(&wdata->refcount, release);
4318 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4319 }
4320
4321async_writev_out:
4322 cifs_small_buf_release(req);
4323 return rc;
4324}
4325
4326/*
4327 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4328 * The length field from io_parms must be at least 1 and indicates a number of
4329 * elements with data to write that begins with position 1 in iov array. All
4330 * data length is specified by count.
4331 */
4332int
4333SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4334 unsigned int *nbytes, struct kvec *iov, int n_vec)
4335{
4336 struct smb_rqst rqst;
4337 int rc = 0;
4338 struct smb2_write_req *req = NULL;
4339 struct smb2_write_rsp *rsp = NULL;
4340 int resp_buftype;
4341 struct kvec rsp_iov;
4342 int flags = 0;
4343 unsigned int total_len;
4344 struct TCP_Server_Info *server;
4345
4346 *nbytes = 0;
4347
4348 if (n_vec < 1)
4349 return rc;
4350
4351 if (!io_parms->server)
4352 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4353 server = io_parms->server;
4354 if (server == NULL)
4355 return -ECONNABORTED;
4356
4357 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4358 (void **) &req, &total_len);
4359 if (rc)
4360 return rc;
4361
4362 if (smb3_encryption_required(io_parms->tcon))
4363 flags |= CIFS_TRANSFORM_REQ;
4364
4365 req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4366
4367 req->PersistentFileId = io_parms->persistent_fid;
4368 req->VolatileFileId = io_parms->volatile_fid;
4369 req->WriteChannelInfoOffset = 0;
4370 req->WriteChannelInfoLength = 0;
4371 req->Channel = 0;
4372 req->Length = cpu_to_le32(io_parms->length);
4373 req->Offset = cpu_to_le64(io_parms->offset);
4374 req->DataOffset = cpu_to_le16(
4375 offsetof(struct smb2_write_req, Buffer));
4376 req->RemainingBytes = 0;
4377
4378 trace_smb3_write_enter(xid, io_parms->persistent_fid,
4379 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4380 io_parms->offset, io_parms->length);
4381
4382 iov[0].iov_base = (char *)req;
4383 /* 1 for Buffer */
4384 iov[0].iov_len = total_len - 1;
4385
4386 memset(&rqst, 0, sizeof(struct smb_rqst));
4387 rqst.rq_iov = iov;
4388 rqst.rq_nvec = n_vec + 1;
4389
4390 rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4391 &rqst,
4392 &resp_buftype, flags, &rsp_iov);
4393 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4394
4395 if (rc) {
4396 trace_smb3_write_err(xid, req->PersistentFileId,
4397 io_parms->tcon->tid,
4398 io_parms->tcon->ses->Suid,
4399 io_parms->offset, io_parms->length, rc);
4400 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4401 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4402 } else {
4403 *nbytes = le32_to_cpu(rsp->DataLength);
4404 trace_smb3_write_done(xid, req->PersistentFileId,
4405 io_parms->tcon->tid,
4406 io_parms->tcon->ses->Suid,
4407 io_parms->offset, *nbytes);
4408 }
4409
4410 cifs_small_buf_release(req);
4411 free_rsp_buf(resp_buftype, rsp);
4412 return rc;
4413}
4414
4415int posix_info_sid_size(const void *beg, const void *end)
4416{
4417 size_t subauth;
4418 int total;
4419
4420 if (beg + 1 > end)
4421 return -1;
4422
4423 subauth = *(u8 *)(beg+1);
4424 if (subauth < 1 || subauth > 15)
4425 return -1;
4426
4427 total = 1 + 1 + 6 + 4*subauth;
4428 if (beg + total > end)
4429 return -1;
4430
4431 return total;
4432}
4433
4434int posix_info_parse(const void *beg, const void *end,
4435 struct smb2_posix_info_parsed *out)
4436
4437{
4438 int total_len = 0;
4439 int sid_len;
4440 int name_len;
4441 const void *owner_sid;
4442 const void *group_sid;
4443 const void *name;
4444
4445 /* if no end bound given, assume payload to be correct */
4446 if (!end) {
4447 const struct smb2_posix_info *p = beg;
4448
4449 end = beg + le32_to_cpu(p->NextEntryOffset);
4450 /* last element will have a 0 offset, pick a sensible bound */
4451 if (end == beg)
4452 end += 0xFFFF;
4453 }
4454
4455 /* check base buf */
4456 if (beg + sizeof(struct smb2_posix_info) > end)
4457 return -1;
4458 total_len = sizeof(struct smb2_posix_info);
4459
4460 /* check owner sid */
4461 owner_sid = beg + total_len;
4462 sid_len = posix_info_sid_size(owner_sid, end);
4463 if (sid_len < 0)
4464 return -1;
4465 total_len += sid_len;
4466
4467 /* check group sid */
4468 group_sid = beg + total_len;
4469 sid_len = posix_info_sid_size(group_sid, end);
4470 if (sid_len < 0)
4471 return -1;
4472 total_len += sid_len;
4473
4474 /* check name len */
4475 if (beg + total_len + 4 > end)
4476 return -1;
4477 name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4478 if (name_len < 1 || name_len > 0xFFFF)
4479 return -1;
4480 total_len += 4;
4481
4482 /* check name */
4483 name = beg + total_len;
4484 if (name + name_len > end)
4485 return -1;
4486 total_len += name_len;
4487
4488 if (out) {
4489 out->base = beg;
4490 out->size = total_len;
4491 out->name_len = name_len;
4492 out->name = name;
4493 memcpy(&out->owner, owner_sid,
4494 posix_info_sid_size(owner_sid, end));
4495 memcpy(&out->group, group_sid,
4496 posix_info_sid_size(group_sid, end));
4497 }
4498 return total_len;
4499}
4500
4501static int posix_info_extra_size(const void *beg, const void *end)
4502{
4503 int len = posix_info_parse(beg, end, NULL);
4504
4505 if (len < 0)
4506 return -1;
4507 return len - sizeof(struct smb2_posix_info);
4508}
4509
4510static unsigned int
4511num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4512 size_t size)
4513{
4514 int len;
4515 unsigned int entrycount = 0;
4516 unsigned int next_offset = 0;
4517 char *entryptr;
4518 FILE_DIRECTORY_INFO *dir_info;
4519
4520 if (bufstart == NULL)
4521 return 0;
4522
4523 entryptr = bufstart;
4524
4525 while (1) {
4526 if (entryptr + next_offset < entryptr ||
4527 entryptr + next_offset > end_of_buf ||
4528 entryptr + next_offset + size > end_of_buf) {
4529 cifs_dbg(VFS, "malformed search entry would overflow\n");
4530 break;
4531 }
4532
4533 entryptr = entryptr + next_offset;
4534 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4535
4536 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4537 len = posix_info_extra_size(entryptr, end_of_buf);
4538 else
4539 len = le32_to_cpu(dir_info->FileNameLength);
4540
4541 if (len < 0 ||
4542 entryptr + len < entryptr ||
4543 entryptr + len > end_of_buf ||
4544 entryptr + len + size > end_of_buf) {
4545 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4546 end_of_buf);
4547 break;
4548 }
4549
4550 *lastentry = entryptr;
4551 entrycount++;
4552
4553 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4554 if (!next_offset)
4555 break;
4556 }
4557
4558 return entrycount;
4559}
4560
4561/*
4562 * Readdir/FindFirst
4563 */
4564int SMB2_query_directory_init(const unsigned int xid,
4565 struct cifs_tcon *tcon,
4566 struct TCP_Server_Info *server,
4567 struct smb_rqst *rqst,
4568 u64 persistent_fid, u64 volatile_fid,
4569 int index, int info_level)
4570{
4571 struct smb2_query_directory_req *req;
4572 unsigned char *bufptr;
4573 __le16 asteriks = cpu_to_le16('*');
4574 unsigned int output_size = CIFSMaxBufSize -
4575 MAX_SMB2_CREATE_RESPONSE_SIZE -
4576 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4577 unsigned int total_len;
4578 struct kvec *iov = rqst->rq_iov;
4579 int len, rc;
4580
4581 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4582 (void **) &req, &total_len);
4583 if (rc)
4584 return rc;
4585
4586 switch (info_level) {
4587 case SMB_FIND_FILE_DIRECTORY_INFO:
4588 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4589 break;
4590 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4591 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4592 break;
4593 case SMB_FIND_FILE_POSIX_INFO:
4594 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4595 break;
4596 default:
4597 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4598 info_level);
4599 return -EINVAL;
4600 }
4601
4602 req->FileIndex = cpu_to_le32(index);
4603 req->PersistentFileId = persistent_fid;
4604 req->VolatileFileId = volatile_fid;
4605
4606 len = 0x2;
4607 bufptr = req->Buffer;
4608 memcpy(bufptr, &asteriks, len);
4609
4610 req->FileNameOffset =
4611 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4612 req->FileNameLength = cpu_to_le16(len);
4613 /*
4614 * BB could be 30 bytes or so longer if we used SMB2 specific
4615 * buffer lengths, but this is safe and close enough.
4616 */
4617 output_size = min_t(unsigned int, output_size, server->maxBuf);
4618 output_size = min_t(unsigned int, output_size, 2 << 15);
4619 req->OutputBufferLength = cpu_to_le32(output_size);
4620
4621 iov[0].iov_base = (char *)req;
4622 /* 1 for Buffer */
4623 iov[0].iov_len = total_len - 1;
4624
4625 iov[1].iov_base = (char *)(req->Buffer);
4626 iov[1].iov_len = len;
4627
4628 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4629 tcon->ses->Suid, index, output_size);
4630
4631 return 0;
4632}
4633
4634void SMB2_query_directory_free(struct smb_rqst *rqst)
4635{
4636 if (rqst && rqst->rq_iov) {
4637 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4638 }
4639}
4640
4641int
4642smb2_parse_query_directory(struct cifs_tcon *tcon,
4643 struct kvec *rsp_iov,
4644 int resp_buftype,
4645 struct cifs_search_info *srch_inf)
4646{
4647 struct smb2_query_directory_rsp *rsp;
4648 size_t info_buf_size;
4649 char *end_of_smb;
4650 int rc;
4651
4652 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4653
4654 switch (srch_inf->info_level) {
4655 case SMB_FIND_FILE_DIRECTORY_INFO:
4656 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4657 break;
4658 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4659 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4660 break;
4661 case SMB_FIND_FILE_POSIX_INFO:
4662 /* note that posix payload are variable size */
4663 info_buf_size = sizeof(struct smb2_posix_info);
4664 break;
4665 default:
4666 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4667 srch_inf->info_level);
4668 return -EINVAL;
4669 }
4670
4671 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4672 le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4673 info_buf_size);
4674 if (rc) {
4675 cifs_tcon_dbg(VFS, "bad info payload");
4676 return rc;
4677 }
4678
4679 srch_inf->unicode = true;
4680
4681 if (srch_inf->ntwrk_buf_start) {
4682 if (srch_inf->smallBuf)
4683 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4684 else
4685 cifs_buf_release(srch_inf->ntwrk_buf_start);
4686 }
4687 srch_inf->ntwrk_buf_start = (char *)rsp;
4688 srch_inf->srch_entries_start = srch_inf->last_entry =
4689 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4690 end_of_smb = rsp_iov->iov_len + (char *)rsp;
4691
4692 srch_inf->entries_in_buffer = num_entries(
4693 srch_inf->info_level,
4694 srch_inf->srch_entries_start,
4695 end_of_smb,
4696 &srch_inf->last_entry,
4697 info_buf_size);
4698
4699 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4700 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4701 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4702 srch_inf->srch_entries_start, srch_inf->last_entry);
4703 if (resp_buftype == CIFS_LARGE_BUFFER)
4704 srch_inf->smallBuf = false;
4705 else if (resp_buftype == CIFS_SMALL_BUFFER)
4706 srch_inf->smallBuf = true;
4707 else
4708 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4709
4710 return 0;
4711}
4712
4713int
4714SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4715 u64 persistent_fid, u64 volatile_fid, int index,
4716 struct cifs_search_info *srch_inf)
4717{
4718 struct smb_rqst rqst;
4719 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4720 struct smb2_query_directory_rsp *rsp = NULL;
4721 int resp_buftype = CIFS_NO_BUFFER;
4722 struct kvec rsp_iov;
4723 int rc = 0;
4724 struct cifs_ses *ses = tcon->ses;
4725 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4726 int flags = 0;
4727
4728 if (!ses || !(ses->server))
4729 return -EIO;
4730
4731 if (smb3_encryption_required(tcon))
4732 flags |= CIFS_TRANSFORM_REQ;
4733
4734 memset(&rqst, 0, sizeof(struct smb_rqst));
4735 memset(&iov, 0, sizeof(iov));
4736 rqst.rq_iov = iov;
4737 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4738
4739 rc = SMB2_query_directory_init(xid, tcon, server,
4740 &rqst, persistent_fid,
4741 volatile_fid, index,
4742 srch_inf->info_level);
4743 if (rc)
4744 goto qdir_exit;
4745
4746 rc = cifs_send_recv(xid, ses, server,
4747 &rqst, &resp_buftype, flags, &rsp_iov);
4748 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4749
4750 if (rc) {
4751 if (rc == -ENODATA &&
4752 rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4753 trace_smb3_query_dir_done(xid, persistent_fid,
4754 tcon->tid, tcon->ses->Suid, index, 0);
4755 srch_inf->endOfSearch = true;
4756 rc = 0;
4757 } else {
4758 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4759 tcon->ses->Suid, index, 0, rc);
4760 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4761 }
4762 goto qdir_exit;
4763 }
4764
4765 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4766 srch_inf);
4767 if (rc) {
4768 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4769 tcon->ses->Suid, index, 0, rc);
4770 goto qdir_exit;
4771 }
4772 resp_buftype = CIFS_NO_BUFFER;
4773
4774 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4775 tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4776
4777qdir_exit:
4778 SMB2_query_directory_free(&rqst);
4779 free_rsp_buf(resp_buftype, rsp);
4780 return rc;
4781}
4782
4783int
4784SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4785 struct smb_rqst *rqst,
4786 u64 persistent_fid, u64 volatile_fid, u32 pid,
4787 u8 info_class, u8 info_type, u32 additional_info,
4788 void **data, unsigned int *size)
4789{
4790 struct smb2_set_info_req *req;
4791 struct kvec *iov = rqst->rq_iov;
4792 unsigned int i, total_len;
4793 int rc;
4794
4795 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4796 (void **) &req, &total_len);
4797 if (rc)
4798 return rc;
4799
4800 req->sync_hdr.ProcessId = cpu_to_le32(pid);
4801 req->InfoType = info_type;
4802 req->FileInfoClass = info_class;
4803 req->PersistentFileId = persistent_fid;
4804 req->VolatileFileId = volatile_fid;
4805 req->AdditionalInformation = cpu_to_le32(additional_info);
4806
4807 req->BufferOffset =
4808 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4809 req->BufferLength = cpu_to_le32(*size);
4810
4811 memcpy(req->Buffer, *data, *size);
4812 total_len += *size;
4813
4814 iov[0].iov_base = (char *)req;
4815 /* 1 for Buffer */
4816 iov[0].iov_len = total_len - 1;
4817
4818 for (i = 1; i < rqst->rq_nvec; i++) {
4819 le32_add_cpu(&req->BufferLength, size[i]);
4820 iov[i].iov_base = (char *)data[i];
4821 iov[i].iov_len = size[i];
4822 }
4823
4824 return 0;
4825}
4826
4827void
4828SMB2_set_info_free(struct smb_rqst *rqst)
4829{
4830 if (rqst && rqst->rq_iov)
4831 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4832}
4833
4834static int
4835send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4836 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4837 u8 info_type, u32 additional_info, unsigned int num,
4838 void **data, unsigned int *size)
4839{
4840 struct smb_rqst rqst;
4841 struct smb2_set_info_rsp *rsp = NULL;
4842 struct kvec *iov;
4843 struct kvec rsp_iov;
4844 int rc = 0;
4845 int resp_buftype;
4846 struct cifs_ses *ses = tcon->ses;
4847 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4848 int flags = 0;
4849
4850 if (!ses || !server)
4851 return -EIO;
4852
4853 if (!num)
4854 return -EINVAL;
4855
4856 if (smb3_encryption_required(tcon))
4857 flags |= CIFS_TRANSFORM_REQ;
4858
4859 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4860 if (!iov)
4861 return -ENOMEM;
4862
4863 memset(&rqst, 0, sizeof(struct smb_rqst));
4864 rqst.rq_iov = iov;
4865 rqst.rq_nvec = num;
4866
4867 rc = SMB2_set_info_init(tcon, server,
4868 &rqst, persistent_fid, volatile_fid, pid,
4869 info_class, info_type, additional_info,
4870 data, size);
4871 if (rc) {
4872 kfree(iov);
4873 return rc;
4874 }
4875
4876
4877 rc = cifs_send_recv(xid, ses, server,
4878 &rqst, &resp_buftype, flags,
4879 &rsp_iov);
4880 SMB2_set_info_free(&rqst);
4881 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4882
4883 if (rc != 0) {
4884 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4885 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4886 ses->Suid, info_class, (__u32)info_type, rc);
4887 }
4888
4889 free_rsp_buf(resp_buftype, rsp);
4890 kfree(iov);
4891 return rc;
4892}
4893
4894int
4895SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4896 u64 volatile_fid, u32 pid, __le64 *eof)
4897{
4898 struct smb2_file_eof_info info;
4899 void *data;
4900 unsigned int size;
4901
4902 info.EndOfFile = *eof;
4903
4904 data = &info;
4905 size = sizeof(struct smb2_file_eof_info);
4906
4907 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4908 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4909 0, 1, &data, &size);
4910}
4911
4912int
4913SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4914 u64 persistent_fid, u64 volatile_fid,
4915 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4916{
4917 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4918 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4919 1, (void **)&pnntsd, &pacllen);
4920}
4921
4922int
4923SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4924 u64 persistent_fid, u64 volatile_fid,
4925 struct smb2_file_full_ea_info *buf, int len)
4926{
4927 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4928 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4929 0, 1, (void **)&buf, &len);
4930}
4931
4932int
4933SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4934 const u64 persistent_fid, const u64 volatile_fid,
4935 __u8 oplock_level)
4936{
4937 struct smb_rqst rqst;
4938 int rc;
4939 struct smb2_oplock_break *req = NULL;
4940 struct cifs_ses *ses = tcon->ses;
4941 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4942 int flags = CIFS_OBREAK_OP;
4943 unsigned int total_len;
4944 struct kvec iov[1];
4945 struct kvec rsp_iov;
4946 int resp_buf_type;
4947
4948 cifs_dbg(FYI, "SMB2_oplock_break\n");
4949 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
4950 (void **) &req, &total_len);
4951 if (rc)
4952 return rc;
4953
4954 if (smb3_encryption_required(tcon))
4955 flags |= CIFS_TRANSFORM_REQ;
4956
4957 req->VolatileFid = volatile_fid;
4958 req->PersistentFid = persistent_fid;
4959 req->OplockLevel = oplock_level;
4960 req->sync_hdr.CreditRequest = cpu_to_le16(1);
4961
4962 flags |= CIFS_NO_RSP_BUF;
4963
4964 iov[0].iov_base = (char *)req;
4965 iov[0].iov_len = total_len;
4966
4967 memset(&rqst, 0, sizeof(struct smb_rqst));
4968 rqst.rq_iov = iov;
4969 rqst.rq_nvec = 1;
4970
4971 rc = cifs_send_recv(xid, ses, server,
4972 &rqst, &resp_buf_type, flags, &rsp_iov);
4973 cifs_small_buf_release(req);
4974
4975 if (rc) {
4976 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4977 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4978 }
4979
4980 return rc;
4981}
4982
4983void
4984smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4985 struct kstatfs *kst)
4986{
4987 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4988 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4989 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4990 kst->f_bfree = kst->f_bavail =
4991 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4992 return;
4993}
4994
4995static void
4996copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4997 struct kstatfs *kst)
4998{
4999 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5000 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5001 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
5002 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5003 kst->f_bavail = kst->f_bfree;
5004 else
5005 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5006 if (response_data->TotalFileNodes != cpu_to_le64(-1))
5007 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5008 if (response_data->FreeFileNodes != cpu_to_le64(-1))
5009 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5010
5011 return;
5012}
5013
5014static int
5015build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5016 struct TCP_Server_Info *server,
5017 int level, int outbuf_len, u64 persistent_fid,
5018 u64 volatile_fid)
5019{
5020 int rc;
5021 struct smb2_query_info_req *req;
5022 unsigned int total_len;
5023
5024 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5025
5026 if ((tcon->ses == NULL) || server == NULL)
5027 return -EIO;
5028
5029 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5030 (void **) &req, &total_len);
5031 if (rc)
5032 return rc;
5033
5034 req->InfoType = SMB2_O_INFO_FILESYSTEM;
5035 req->FileInfoClass = level;
5036 req->PersistentFileId = persistent_fid;
5037 req->VolatileFileId = volatile_fid;
5038 /* 1 for pad */
5039 req->InputBufferOffset =
5040 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5041 req->OutputBufferLength = cpu_to_le32(
5042 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5043
5044 iov->iov_base = (char *)req;
5045 iov->iov_len = total_len;
5046 return 0;
5047}
5048
5049int
5050SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5051 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5052{
5053 struct smb_rqst rqst;
5054 struct smb2_query_info_rsp *rsp = NULL;
5055 struct kvec iov;
5056 struct kvec rsp_iov;
5057 int rc = 0;
5058 int resp_buftype;
5059 struct cifs_ses *ses = tcon->ses;
5060 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5061 FILE_SYSTEM_POSIX_INFO *info = NULL;
5062 int flags = 0;
5063
5064 rc = build_qfs_info_req(&iov, tcon, server,
5065 FS_POSIX_INFORMATION,
5066 sizeof(FILE_SYSTEM_POSIX_INFO),
5067 persistent_fid, volatile_fid);
5068 if (rc)
5069 return rc;
5070
5071 if (smb3_encryption_required(tcon))
5072 flags |= CIFS_TRANSFORM_REQ;
5073
5074 memset(&rqst, 0, sizeof(struct smb_rqst));
5075 rqst.rq_iov = &iov;
5076 rqst.rq_nvec = 1;
5077
5078 rc = cifs_send_recv(xid, ses, server,
5079 &rqst, &resp_buftype, flags, &rsp_iov);
5080 cifs_small_buf_release(iov.iov_base);
5081 if (rc) {
5082 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5083 goto posix_qfsinf_exit;
5084 }
5085 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5086
5087 info = (FILE_SYSTEM_POSIX_INFO *)(
5088 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5089 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5090 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5091 sizeof(FILE_SYSTEM_POSIX_INFO));
5092 if (!rc)
5093 copy_posix_fs_info_to_kstatfs(info, fsdata);
5094
5095posix_qfsinf_exit:
5096 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5097 return rc;
5098}
5099
5100int
5101SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5102 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5103{
5104 struct smb_rqst rqst;
5105 struct smb2_query_info_rsp *rsp = NULL;
5106 struct kvec iov;
5107 struct kvec rsp_iov;
5108 int rc = 0;
5109 int resp_buftype;
5110 struct cifs_ses *ses = tcon->ses;
5111 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5112 struct smb2_fs_full_size_info *info = NULL;
5113 int flags = 0;
5114
5115 rc = build_qfs_info_req(&iov, tcon, server,
5116 FS_FULL_SIZE_INFORMATION,
5117 sizeof(struct smb2_fs_full_size_info),
5118 persistent_fid, volatile_fid);
5119 if (rc)
5120 return rc;
5121
5122 if (smb3_encryption_required(tcon))
5123 flags |= CIFS_TRANSFORM_REQ;
5124
5125 memset(&rqst, 0, sizeof(struct smb_rqst));
5126 rqst.rq_iov = &iov;
5127 rqst.rq_nvec = 1;
5128
5129 rc = cifs_send_recv(xid, ses, server,
5130 &rqst, &resp_buftype, flags, &rsp_iov);
5131 cifs_small_buf_release(iov.iov_base);
5132 if (rc) {
5133 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5134 goto qfsinf_exit;
5135 }
5136 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5137
5138 info = (struct smb2_fs_full_size_info *)(
5139 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5140 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5141 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5142 sizeof(struct smb2_fs_full_size_info));
5143 if (!rc)
5144 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5145
5146qfsinf_exit:
5147 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5148 return rc;
5149}
5150
5151int
5152SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5153 u64 persistent_fid, u64 volatile_fid, int level)
5154{
5155 struct smb_rqst rqst;
5156 struct smb2_query_info_rsp *rsp = NULL;
5157 struct kvec iov;
5158 struct kvec rsp_iov;
5159 int rc = 0;
5160 int resp_buftype, max_len, min_len;
5161 struct cifs_ses *ses = tcon->ses;
5162 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5163 unsigned int rsp_len, offset;
5164 int flags = 0;
5165
5166 if (level == FS_DEVICE_INFORMATION) {
5167 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5168 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5169 } else if (level == FS_ATTRIBUTE_INFORMATION) {
5170 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5171 min_len = MIN_FS_ATTR_INFO_SIZE;
5172 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5173 max_len = sizeof(struct smb3_fs_ss_info);
5174 min_len = sizeof(struct smb3_fs_ss_info);
5175 } else if (level == FS_VOLUME_INFORMATION) {
5176 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5177 min_len = sizeof(struct smb3_fs_vol_info);
5178 } else {
5179 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5180 return -EINVAL;
5181 }
5182
5183 rc = build_qfs_info_req(&iov, tcon, server,
5184 level, max_len,
5185 persistent_fid, volatile_fid);
5186 if (rc)
5187 return rc;
5188
5189 if (smb3_encryption_required(tcon))
5190 flags |= CIFS_TRANSFORM_REQ;
5191
5192 memset(&rqst, 0, sizeof(struct smb_rqst));
5193 rqst.rq_iov = &iov;
5194 rqst.rq_nvec = 1;
5195
5196 rc = cifs_send_recv(xid, ses, server,
5197 &rqst, &resp_buftype, flags, &rsp_iov);
5198 cifs_small_buf_release(iov.iov_base);
5199 if (rc) {
5200 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5201 goto qfsattr_exit;
5202 }
5203 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5204
5205 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5206 offset = le16_to_cpu(rsp->OutputBufferOffset);
5207 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5208 if (rc)
5209 goto qfsattr_exit;
5210
5211 if (level == FS_ATTRIBUTE_INFORMATION)
5212 memcpy(&tcon->fsAttrInfo, offset
5213 + (char *)rsp, min_t(unsigned int,
5214 rsp_len, max_len));
5215 else if (level == FS_DEVICE_INFORMATION)
5216 memcpy(&tcon->fsDevInfo, offset
5217 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5218 else if (level == FS_SECTOR_SIZE_INFORMATION) {
5219 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5220 (offset + (char *)rsp);
5221 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5222 tcon->perf_sector_size =
5223 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5224 } else if (level == FS_VOLUME_INFORMATION) {
5225 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5226 (offset + (char *)rsp);
5227 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5228 tcon->vol_create_time = vol_info->VolumeCreationTime;
5229 }
5230
5231qfsattr_exit:
5232 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5233 return rc;
5234}
5235
5236int
5237smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5238 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5239 const __u32 num_lock, struct smb2_lock_element *buf)
5240{
5241 struct smb_rqst rqst;
5242 int rc = 0;
5243 struct smb2_lock_req *req = NULL;
5244 struct kvec iov[2];
5245 struct kvec rsp_iov;
5246 int resp_buf_type;
5247 unsigned int count;
5248 int flags = CIFS_NO_RSP_BUF;
5249 unsigned int total_len;
5250 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5251
5252 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5253
5254 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5255 (void **) &req, &total_len);
5256 if (rc)
5257 return rc;
5258
5259 if (smb3_encryption_required(tcon))
5260 flags |= CIFS_TRANSFORM_REQ;
5261
5262 req->sync_hdr.ProcessId = cpu_to_le32(pid);
5263 req->LockCount = cpu_to_le16(num_lock);
5264
5265 req->PersistentFileId = persist_fid;
5266 req->VolatileFileId = volatile_fid;
5267
5268 count = num_lock * sizeof(struct smb2_lock_element);
5269
5270 iov[0].iov_base = (char *)req;
5271 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5272 iov[1].iov_base = (char *)buf;
5273 iov[1].iov_len = count;
5274
5275 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5276
5277 memset(&rqst, 0, sizeof(struct smb_rqst));
5278 rqst.rq_iov = iov;
5279 rqst.rq_nvec = 2;
5280
5281 rc = cifs_send_recv(xid, tcon->ses, server,
5282 &rqst, &resp_buf_type, flags,
5283 &rsp_iov);
5284 cifs_small_buf_release(req);
5285 if (rc) {
5286 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5287 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5288 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5289 tcon->ses->Suid, rc);
5290 }
5291
5292 return rc;
5293}
5294
5295int
5296SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5297 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5298 const __u64 length, const __u64 offset, const __u32 lock_flags,
5299 const bool wait)
5300{
5301 struct smb2_lock_element lock;
5302
5303 lock.Offset = cpu_to_le64(offset);
5304 lock.Length = cpu_to_le64(length);
5305 lock.Flags = cpu_to_le32(lock_flags);
5306 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5307 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5308
5309 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5310}
5311
5312int
5313SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5314 __u8 *lease_key, const __le32 lease_state)
5315{
5316 struct smb_rqst rqst;
5317 int rc;
5318 struct smb2_lease_ack *req = NULL;
5319 struct cifs_ses *ses = tcon->ses;
5320 int flags = CIFS_OBREAK_OP;
5321 unsigned int total_len;
5322 struct kvec iov[1];
5323 struct kvec rsp_iov;
5324 int resp_buf_type;
5325 __u64 *please_key_high;
5326 __u64 *please_key_low;
5327 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5328
5329 cifs_dbg(FYI, "SMB2_lease_break\n");
5330 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5331 (void **) &req, &total_len);
5332 if (rc)
5333 return rc;
5334
5335 if (smb3_encryption_required(tcon))
5336 flags |= CIFS_TRANSFORM_REQ;
5337
5338 req->sync_hdr.CreditRequest = cpu_to_le16(1);
5339 req->StructureSize = cpu_to_le16(36);
5340 total_len += 12;
5341
5342 memcpy(req->LeaseKey, lease_key, 16);
5343 req->LeaseState = lease_state;
5344
5345 flags |= CIFS_NO_RSP_BUF;
5346
5347 iov[0].iov_base = (char *)req;
5348 iov[0].iov_len = total_len;
5349
5350 memset(&rqst, 0, sizeof(struct smb_rqst));
5351 rqst.rq_iov = iov;
5352 rqst.rq_nvec = 1;
5353
5354 rc = cifs_send_recv(xid, ses, server,
5355 &rqst, &resp_buf_type, flags, &rsp_iov);
5356 cifs_small_buf_release(req);
5357
5358 please_key_low = (__u64 *)lease_key;
5359 please_key_high = (__u64 *)(lease_key+8);
5360 if (rc) {
5361 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5362 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5363 ses->Suid, *please_key_low, *please_key_high, rc);
5364 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5365 } else
5366 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5367 ses->Suid, *please_key_low, *please_key_high);
5368
5369 return rc;
5370}