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1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/smb2pdu.c
4 *
5 * Copyright (C) International Business Machines Corp., 2009, 2013
6 * Etersoft, 2012
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 * Pavel Shilovsky (pshilovsky@samba.org) 2012
9 *
10 * Contains the routines for constructing the SMB2 PDUs themselves
11 *
12 */
13
14 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
15 /* Note that there are handle based routines which must be */
16 /* treated slightly differently for reconnection purposes since we never */
17 /* want to reuse a stale file handle and only the caller knows the file info */
18
19#include <linux/fs.h>
20#include <linux/kernel.h>
21#include <linux/vfs.h>
22#include <linux/task_io_accounting_ops.h>
23#include <linux/uaccess.h>
24#include <linux/uuid.h>
25#include <linux/pagemap.h>
26#include <linux/xattr.h>
27#include "smb2pdu.h"
28#include "cifsglob.h"
29#include "cifsacl.h"
30#include "cifsproto.h"
31#include "smb2proto.h"
32#include "cifs_unicode.h"
33#include "cifs_debug.h"
34#include "ntlmssp.h"
35#include "smb2status.h"
36#include "smb2glob.h"
37#include "cifspdu.h"
38#include "cifs_spnego.h"
39#include "smbdirect.h"
40#include "trace.h"
41#ifdef CONFIG_CIFS_DFS_UPCALL
42#include "dfs_cache.h"
43#endif
44
45/*
46 * The following table defines the expected "StructureSize" of SMB2 requests
47 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
48 *
49 * Note that commands are defined in smb2pdu.h in le16 but the array below is
50 * indexed by command in host byte order.
51 */
52static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
53 /* SMB2_NEGOTIATE */ 36,
54 /* SMB2_SESSION_SETUP */ 25,
55 /* SMB2_LOGOFF */ 4,
56 /* SMB2_TREE_CONNECT */ 9,
57 /* SMB2_TREE_DISCONNECT */ 4,
58 /* SMB2_CREATE */ 57,
59 /* SMB2_CLOSE */ 24,
60 /* SMB2_FLUSH */ 24,
61 /* SMB2_READ */ 49,
62 /* SMB2_WRITE */ 49,
63 /* SMB2_LOCK */ 48,
64 /* SMB2_IOCTL */ 57,
65 /* SMB2_CANCEL */ 4,
66 /* SMB2_ECHO */ 4,
67 /* SMB2_QUERY_DIRECTORY */ 33,
68 /* SMB2_CHANGE_NOTIFY */ 32,
69 /* SMB2_QUERY_INFO */ 41,
70 /* SMB2_SET_INFO */ 33,
71 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
72};
73
74int smb3_encryption_required(const struct cifs_tcon *tcon)
75{
76 if (!tcon || !tcon->ses)
77 return 0;
78 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
79 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
80 return 1;
81 if (tcon->seal &&
82 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
83 return 1;
84 return 0;
85}
86
87static void
88smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
89 const struct cifs_tcon *tcon,
90 struct TCP_Server_Info *server)
91{
92 shdr->ProtocolId = SMB2_PROTO_NUMBER;
93 shdr->StructureSize = cpu_to_le16(64);
94 shdr->Command = smb2_cmd;
95 if (server) {
96 spin_lock(&server->req_lock);
97 /* Request up to 10 credits but don't go over the limit. */
98 if (server->credits >= server->max_credits)
99 shdr->CreditRequest = cpu_to_le16(0);
100 else
101 shdr->CreditRequest = cpu_to_le16(
102 min_t(int, server->max_credits -
103 server->credits, 10));
104 spin_unlock(&server->req_lock);
105 } else {
106 shdr->CreditRequest = cpu_to_le16(2);
107 }
108 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
109
110 if (!tcon)
111 goto out;
112
113 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
114 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
115 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
116 shdr->CreditCharge = cpu_to_le16(1);
117 /* else CreditCharge MBZ */
118
119 shdr->TreeId = tcon->tid;
120 /* Uid is not converted */
121 if (tcon->ses)
122 shdr->SessionId = tcon->ses->Suid;
123
124 /*
125 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
126 * to pass the path on the Open SMB prefixed by \\server\share.
127 * Not sure when we would need to do the augmented path (if ever) and
128 * setting this flag breaks the SMB2 open operation since it is
129 * illegal to send an empty path name (without \\server\share prefix)
130 * when the DFS flag is set in the SMB open header. We could
131 * consider setting the flag on all operations other than open
132 * but it is safer to net set it for now.
133 */
134/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
135 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
136
137 if (server && server->sign && !smb3_encryption_required(tcon))
138 shdr->Flags |= SMB2_FLAGS_SIGNED;
139out:
140 return;
141}
142
143static int
144smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
145 struct TCP_Server_Info *server)
146{
147 int rc;
148 struct nls_table *nls_codepage;
149 struct cifs_ses *ses;
150 int retries;
151
152 /*
153 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
154 * check for tcp and smb session status done differently
155 * for those three - in the calling routine.
156 */
157 if (tcon == NULL)
158 return 0;
159
160 if (smb2_command == SMB2_TREE_CONNECT)
161 return 0;
162
163 if (tcon->tidStatus == CifsExiting) {
164 /*
165 * only tree disconnect, open, and write,
166 * (and ulogoff which does not have tcon)
167 * are allowed as we start force umount.
168 */
169 if ((smb2_command != SMB2_WRITE) &&
170 (smb2_command != SMB2_CREATE) &&
171 (smb2_command != SMB2_TREE_DISCONNECT)) {
172 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
173 smb2_command);
174 return -ENODEV;
175 }
176 }
177 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
178 (!tcon->ses->server) || !server)
179 return -EIO;
180
181 ses = tcon->ses;
182 retries = server->nr_targets;
183
184 /*
185 * Give demultiplex thread up to 10 seconds to each target available for
186 * reconnect -- should be greater than cifs socket timeout which is 7
187 * seconds.
188 */
189 while (server->tcpStatus == CifsNeedReconnect) {
190 /*
191 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
192 * here since they are implicitly done when session drops.
193 */
194 switch (smb2_command) {
195 /*
196 * BB Should we keep oplock break and add flush to exceptions?
197 */
198 case SMB2_TREE_DISCONNECT:
199 case SMB2_CANCEL:
200 case SMB2_CLOSE:
201 case SMB2_OPLOCK_BREAK:
202 return -EAGAIN;
203 }
204
205 rc = wait_event_interruptible_timeout(server->response_q,
206 (server->tcpStatus != CifsNeedReconnect),
207 10 * HZ);
208 if (rc < 0) {
209 cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
210 __func__);
211 return -ERESTARTSYS;
212 }
213
214 /* are we still trying to reconnect? */
215 if (server->tcpStatus != CifsNeedReconnect)
216 break;
217
218 if (retries && --retries)
219 continue;
220
221 /*
222 * on "soft" mounts we wait once. Hard mounts keep
223 * retrying until process is killed or server comes
224 * back on-line
225 */
226 if (!tcon->retry) {
227 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
228 return -EHOSTDOWN;
229 }
230 retries = server->nr_targets;
231 }
232
233 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
234 return 0;
235
236 nls_codepage = load_nls_default();
237
238 /*
239 * need to prevent multiple threads trying to simultaneously reconnect
240 * the same SMB session
241 */
242 mutex_lock(&tcon->ses->session_mutex);
243
244 /*
245 * Recheck after acquire mutex. If another thread is negotiating
246 * and the server never sends an answer the socket will be closed
247 * and tcpStatus set to reconnect.
248 */
249 if (server->tcpStatus == CifsNeedReconnect) {
250 rc = -EHOSTDOWN;
251 mutex_unlock(&tcon->ses->session_mutex);
252 goto out;
253 }
254
255 /*
256 * If we are reconnecting an extra channel, bind
257 */
258 if (server->is_channel) {
259 ses->binding = true;
260 ses->binding_chan = cifs_ses_find_chan(ses, server);
261 }
262
263 rc = cifs_negotiate_protocol(0, tcon->ses);
264 if (!rc && tcon->ses->need_reconnect) {
265 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
266 if ((rc == -EACCES) && !tcon->retry) {
267 rc = -EHOSTDOWN;
268 ses->binding = false;
269 ses->binding_chan = NULL;
270 mutex_unlock(&tcon->ses->session_mutex);
271 goto failed;
272 }
273 }
274 /*
275 * End of channel binding
276 */
277 ses->binding = false;
278 ses->binding_chan = NULL;
279
280 if (rc || !tcon->need_reconnect) {
281 mutex_unlock(&tcon->ses->session_mutex);
282 goto out;
283 }
284
285 cifs_mark_open_files_invalid(tcon);
286 if (tcon->use_persistent)
287 tcon->need_reopen_files = true;
288
289 rc = cifs_tree_connect(0, tcon, nls_codepage);
290 mutex_unlock(&tcon->ses->session_mutex);
291
292 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
293 if (rc) {
294 /* If sess reconnected but tcon didn't, something strange ... */
295 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
296 goto out;
297 }
298
299 if (smb2_command != SMB2_INTERNAL_CMD)
300 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
301
302 atomic_inc(&tconInfoReconnectCount);
303out:
304 /*
305 * Check if handle based operation so we know whether we can continue
306 * or not without returning to caller to reset file handle.
307 */
308 /*
309 * BB Is flush done by server on drop of tcp session? Should we special
310 * case it and skip above?
311 */
312 switch (smb2_command) {
313 case SMB2_FLUSH:
314 case SMB2_READ:
315 case SMB2_WRITE:
316 case SMB2_LOCK:
317 case SMB2_IOCTL:
318 case SMB2_QUERY_DIRECTORY:
319 case SMB2_CHANGE_NOTIFY:
320 case SMB2_QUERY_INFO:
321 case SMB2_SET_INFO:
322 rc = -EAGAIN;
323 }
324failed:
325 unload_nls(nls_codepage);
326 return rc;
327}
328
329static void
330fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
331 struct TCP_Server_Info *server,
332 void *buf,
333 unsigned int *total_len)
334{
335 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
336 /* lookup word count ie StructureSize from table */
337 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
338
339 /*
340 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
341 * largest operations (Create)
342 */
343 memset(buf, 0, 256);
344
345 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
346 spdu->StructureSize2 = cpu_to_le16(parmsize);
347
348 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
349}
350
351/*
352 * Allocate and return pointer to an SMB request hdr, and set basic
353 * SMB information in the SMB header. If the return code is zero, this
354 * function must have filled in request_buf pointer.
355 */
356static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
357 struct TCP_Server_Info *server,
358 void **request_buf, unsigned int *total_len)
359{
360 /* BB eventually switch this to SMB2 specific small buf size */
361 if (smb2_command == SMB2_SET_INFO)
362 *request_buf = cifs_buf_get();
363 else
364 *request_buf = cifs_small_buf_get();
365 if (*request_buf == NULL) {
366 /* BB should we add a retry in here if not a writepage? */
367 return -ENOMEM;
368 }
369
370 fill_small_buf(smb2_command, tcon, server,
371 (struct smb2_sync_hdr *)(*request_buf),
372 total_len);
373
374 if (tcon != NULL) {
375 uint16_t com_code = le16_to_cpu(smb2_command);
376 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
377 cifs_stats_inc(&tcon->num_smbs_sent);
378 }
379
380 return 0;
381}
382
383static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
384 struct TCP_Server_Info *server,
385 void **request_buf, unsigned int *total_len)
386{
387 int rc;
388
389 rc = smb2_reconnect(smb2_command, tcon, server);
390 if (rc)
391 return rc;
392
393 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
394 total_len);
395}
396
397static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
398 struct TCP_Server_Info *server,
399 void **request_buf, unsigned int *total_len)
400{
401 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
402 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
403 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
404 request_buf, total_len);
405 }
406 return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
407 request_buf, total_len);
408}
409
410/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
411
412static void
413build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
414{
415 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
416 pneg_ctxt->DataLength = cpu_to_le16(38);
417 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
418 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
419 get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
420 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
421}
422
423static void
424build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
425{
426 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
427 pneg_ctxt->DataLength =
428 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
429 - sizeof(struct smb2_neg_context));
430 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
431 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
432 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
433 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
434}
435
436static unsigned int
437build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
438{
439 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
440 unsigned short num_algs = 1; /* number of signing algorithms sent */
441
442 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
443 /*
444 * Context Data length must be rounded to multiple of 8 for some servers
445 */
446 pneg_ctxt->DataLength = cpu_to_le16(DIV_ROUND_UP(
447 sizeof(struct smb2_signing_capabilities) -
448 sizeof(struct smb2_neg_context) +
449 (num_algs * 2 /* sizeof u16 */), 8) * 8);
450 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
451 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
452
453 ctxt_len += 2 /* sizeof le16 */ * num_algs;
454 ctxt_len = DIV_ROUND_UP(ctxt_len, 8) * 8;
455 return ctxt_len;
456 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
457}
458
459static void
460build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
461{
462 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
463 if (require_gcm_256) {
464 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
465 pneg_ctxt->CipherCount = cpu_to_le16(1);
466 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
467 } else if (enable_gcm_256) {
468 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
469 pneg_ctxt->CipherCount = cpu_to_le16(3);
470 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
471 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
472 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
473 } else {
474 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
475 pneg_ctxt->CipherCount = cpu_to_le16(2);
476 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
477 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
478 }
479}
480
481static unsigned int
482build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
483{
484 struct nls_table *cp = load_nls_default();
485
486 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
487
488 /* copy up to max of first 100 bytes of server name to NetName field */
489 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
490 /* context size is DataLength + minimal smb2_neg_context */
491 return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
492 sizeof(struct smb2_neg_context), 8) * 8;
493}
494
495static void
496build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
497{
498 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
499 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
500 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
501 pneg_ctxt->Name[0] = 0x93;
502 pneg_ctxt->Name[1] = 0xAD;
503 pneg_ctxt->Name[2] = 0x25;
504 pneg_ctxt->Name[3] = 0x50;
505 pneg_ctxt->Name[4] = 0x9C;
506 pneg_ctxt->Name[5] = 0xB4;
507 pneg_ctxt->Name[6] = 0x11;
508 pneg_ctxt->Name[7] = 0xE7;
509 pneg_ctxt->Name[8] = 0xB4;
510 pneg_ctxt->Name[9] = 0x23;
511 pneg_ctxt->Name[10] = 0x83;
512 pneg_ctxt->Name[11] = 0xDE;
513 pneg_ctxt->Name[12] = 0x96;
514 pneg_ctxt->Name[13] = 0x8B;
515 pneg_ctxt->Name[14] = 0xCD;
516 pneg_ctxt->Name[15] = 0x7C;
517}
518
519static void
520assemble_neg_contexts(struct smb2_negotiate_req *req,
521 struct TCP_Server_Info *server, unsigned int *total_len)
522{
523 char *pneg_ctxt;
524 unsigned int ctxt_len, neg_context_count;
525
526 if (*total_len > 200) {
527 /* In case length corrupted don't want to overrun smb buffer */
528 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
529 return;
530 }
531
532 /*
533 * round up total_len of fixed part of SMB3 negotiate request to 8
534 * byte boundary before adding negotiate contexts
535 */
536 *total_len = roundup(*total_len, 8);
537
538 pneg_ctxt = (*total_len) + (char *)req;
539 req->NegotiateContextOffset = cpu_to_le32(*total_len);
540
541 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
542 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
543 *total_len += ctxt_len;
544 pneg_ctxt += ctxt_len;
545
546 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
547 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
548 *total_len += ctxt_len;
549 pneg_ctxt += ctxt_len;
550
551 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
552 server->hostname);
553 *total_len += ctxt_len;
554 pneg_ctxt += ctxt_len;
555
556 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
557 *total_len += sizeof(struct smb2_posix_neg_context);
558 pneg_ctxt += sizeof(struct smb2_posix_neg_context);
559
560 neg_context_count = 4;
561
562 if (server->compress_algorithm) {
563 build_compression_ctxt((struct smb2_compression_capabilities_context *)
564 pneg_ctxt);
565 ctxt_len = DIV_ROUND_UP(
566 sizeof(struct smb2_compression_capabilities_context),
567 8) * 8;
568 *total_len += ctxt_len;
569 pneg_ctxt += ctxt_len;
570 neg_context_count++;
571 }
572
573 if (enable_negotiate_signing) {
574 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
575 pneg_ctxt);
576 *total_len += ctxt_len;
577 pneg_ctxt += ctxt_len;
578 neg_context_count++;
579 }
580
581 /* check for and add transport_capabilities and signing capabilities */
582 req->NegotiateContextCount = cpu_to_le16(neg_context_count);
583
584}
585
586static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
587{
588 unsigned int len = le16_to_cpu(ctxt->DataLength);
589
590 /* If invalid preauth context warn but use what we requested, SHA-512 */
591 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
592 pr_warn_once("server sent bad preauth context\n");
593 return;
594 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
595 pr_warn_once("server sent invalid SaltLength\n");
596 return;
597 }
598 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
599 pr_warn_once("Invalid SMB3 hash algorithm count\n");
600 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
601 pr_warn_once("unknown SMB3 hash algorithm\n");
602}
603
604static void decode_compress_ctx(struct TCP_Server_Info *server,
605 struct smb2_compression_capabilities_context *ctxt)
606{
607 unsigned int len = le16_to_cpu(ctxt->DataLength);
608
609 /* sizeof compress context is a one element compression capbility struct */
610 if (len < 10) {
611 pr_warn_once("server sent bad compression cntxt\n");
612 return;
613 }
614 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
615 pr_warn_once("Invalid SMB3 compress algorithm count\n");
616 return;
617 }
618 if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
619 pr_warn_once("unknown compression algorithm\n");
620 return;
621 }
622 server->compress_algorithm = ctxt->CompressionAlgorithms[0];
623}
624
625static int decode_encrypt_ctx(struct TCP_Server_Info *server,
626 struct smb2_encryption_neg_context *ctxt)
627{
628 unsigned int len = le16_to_cpu(ctxt->DataLength);
629
630 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
631 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
632 pr_warn_once("server sent bad crypto ctxt len\n");
633 return -EINVAL;
634 }
635
636 if (le16_to_cpu(ctxt->CipherCount) != 1) {
637 pr_warn_once("Invalid SMB3.11 cipher count\n");
638 return -EINVAL;
639 }
640 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
641 if (require_gcm_256) {
642 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
643 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
644 return -EOPNOTSUPP;
645 }
646 } else if (ctxt->Ciphers[0] == 0) {
647 /*
648 * e.g. if server only supported AES256_CCM (very unlikely)
649 * or server supported no encryption types or had all disabled.
650 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
651 * in which mount requested encryption ("seal") checks later
652 * on during tree connection will return proper rc, but if
653 * seal not requested by client, since server is allowed to
654 * return 0 to indicate no supported cipher, we can't fail here
655 */
656 server->cipher_type = 0;
657 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
658 pr_warn_once("Server does not support requested encryption types\n");
659 return 0;
660 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
661 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
662 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
663 /* server returned a cipher we didn't ask for */
664 pr_warn_once("Invalid SMB3.11 cipher returned\n");
665 return -EINVAL;
666 }
667 server->cipher_type = ctxt->Ciphers[0];
668 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
669 return 0;
670}
671
672static void decode_signing_ctx(struct TCP_Server_Info *server,
673 struct smb2_signing_capabilities *pctxt)
674{
675 unsigned int len = le16_to_cpu(pctxt->DataLength);
676
677 if ((len < 4) || (len > 16)) {
678 pr_warn_once("server sent bad signing negcontext\n");
679 return;
680 }
681 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
682 pr_warn_once("Invalid signing algorithm count\n");
683 return;
684 }
685 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
686 pr_warn_once("unknown signing algorithm\n");
687 return;
688 }
689
690 server->signing_negotiated = true;
691 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
692 cifs_dbg(FYI, "signing algorithm %d chosen\n",
693 server->signing_algorithm);
694}
695
696
697static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
698 struct TCP_Server_Info *server,
699 unsigned int len_of_smb)
700{
701 struct smb2_neg_context *pctx;
702 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
703 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
704 unsigned int len_of_ctxts, i;
705 int rc = 0;
706
707 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
708 if (len_of_smb <= offset) {
709 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
710 return -EINVAL;
711 }
712
713 len_of_ctxts = len_of_smb - offset;
714
715 for (i = 0; i < ctxt_cnt; i++) {
716 int clen;
717 /* check that offset is not beyond end of SMB */
718 if (len_of_ctxts == 0)
719 break;
720
721 if (len_of_ctxts < sizeof(struct smb2_neg_context))
722 break;
723
724 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
725 clen = le16_to_cpu(pctx->DataLength);
726 if (clen > len_of_ctxts)
727 break;
728
729 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
730 decode_preauth_context(
731 (struct smb2_preauth_neg_context *)pctx);
732 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
733 rc = decode_encrypt_ctx(server,
734 (struct smb2_encryption_neg_context *)pctx);
735 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
736 decode_compress_ctx(server,
737 (struct smb2_compression_capabilities_context *)pctx);
738 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
739 server->posix_ext_supported = true;
740 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
741 decode_signing_ctx(server,
742 (struct smb2_signing_capabilities *)pctx);
743 else
744 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
745 le16_to_cpu(pctx->ContextType));
746
747 if (rc)
748 break;
749 /* offsets must be 8 byte aligned */
750 clen = (clen + 7) & ~0x7;
751 offset += clen + sizeof(struct smb2_neg_context);
752 len_of_ctxts -= clen;
753 }
754 return rc;
755}
756
757static struct create_posix *
758create_posix_buf(umode_t mode)
759{
760 struct create_posix *buf;
761
762 buf = kzalloc(sizeof(struct create_posix),
763 GFP_KERNEL);
764 if (!buf)
765 return NULL;
766
767 buf->ccontext.DataOffset =
768 cpu_to_le16(offsetof(struct create_posix, Mode));
769 buf->ccontext.DataLength = cpu_to_le32(4);
770 buf->ccontext.NameOffset =
771 cpu_to_le16(offsetof(struct create_posix, Name));
772 buf->ccontext.NameLength = cpu_to_le16(16);
773
774 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
775 buf->Name[0] = 0x93;
776 buf->Name[1] = 0xAD;
777 buf->Name[2] = 0x25;
778 buf->Name[3] = 0x50;
779 buf->Name[4] = 0x9C;
780 buf->Name[5] = 0xB4;
781 buf->Name[6] = 0x11;
782 buf->Name[7] = 0xE7;
783 buf->Name[8] = 0xB4;
784 buf->Name[9] = 0x23;
785 buf->Name[10] = 0x83;
786 buf->Name[11] = 0xDE;
787 buf->Name[12] = 0x96;
788 buf->Name[13] = 0x8B;
789 buf->Name[14] = 0xCD;
790 buf->Name[15] = 0x7C;
791 buf->Mode = cpu_to_le32(mode);
792 cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
793 return buf;
794}
795
796static int
797add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
798{
799 struct smb2_create_req *req = iov[0].iov_base;
800 unsigned int num = *num_iovec;
801
802 iov[num].iov_base = create_posix_buf(mode);
803 if (mode == ACL_NO_MODE)
804 cifs_dbg(FYI, "Invalid mode\n");
805 if (iov[num].iov_base == NULL)
806 return -ENOMEM;
807 iov[num].iov_len = sizeof(struct create_posix);
808 if (!req->CreateContextsOffset)
809 req->CreateContextsOffset = cpu_to_le32(
810 sizeof(struct smb2_create_req) +
811 iov[num - 1].iov_len);
812 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
813 *num_iovec = num + 1;
814 return 0;
815}
816
817
818/*
819 *
820 * SMB2 Worker functions follow:
821 *
822 * The general structure of the worker functions is:
823 * 1) Call smb2_init (assembles SMB2 header)
824 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
825 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
826 * 4) Decode SMB2 command specific fields in the fixed length area
827 * 5) Decode variable length data area (if any for this SMB2 command type)
828 * 6) Call free smb buffer
829 * 7) return
830 *
831 */
832
833int
834SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
835{
836 struct smb_rqst rqst;
837 struct smb2_negotiate_req *req;
838 struct smb2_negotiate_rsp *rsp;
839 struct kvec iov[1];
840 struct kvec rsp_iov;
841 int rc = 0;
842 int resp_buftype;
843 struct TCP_Server_Info *server = cifs_ses_server(ses);
844 int blob_offset, blob_length;
845 char *security_blob;
846 int flags = CIFS_NEG_OP;
847 unsigned int total_len;
848
849 cifs_dbg(FYI, "Negotiate protocol\n");
850
851 if (!server) {
852 WARN(1, "%s: server is NULL!\n", __func__);
853 return -EIO;
854 }
855
856 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
857 (void **) &req, &total_len);
858 if (rc)
859 return rc;
860
861 req->sync_hdr.SessionId = 0;
862
863 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
864 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
865
866 if (strcmp(server->vals->version_string,
867 SMB3ANY_VERSION_STRING) == 0) {
868 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
869 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
870 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
871 req->DialectCount = cpu_to_le16(3);
872 total_len += 6;
873 } else if (strcmp(server->vals->version_string,
874 SMBDEFAULT_VERSION_STRING) == 0) {
875 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
876 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
877 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
878 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
879 req->DialectCount = cpu_to_le16(4);
880 total_len += 8;
881 } else {
882 /* otherwise send specific dialect */
883 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
884 req->DialectCount = cpu_to_le16(1);
885 total_len += 2;
886 }
887
888 /* only one of SMB2 signing flags may be set in SMB2 request */
889 if (ses->sign)
890 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
891 else if (global_secflags & CIFSSEC_MAY_SIGN)
892 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
893 else
894 req->SecurityMode = 0;
895
896 req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
897 if (ses->chan_max > 1)
898 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
899
900 /* ClientGUID must be zero for SMB2.02 dialect */
901 if (server->vals->protocol_id == SMB20_PROT_ID)
902 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
903 else {
904 memcpy(req->ClientGUID, server->client_guid,
905 SMB2_CLIENT_GUID_SIZE);
906 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
907 (strcmp(server->vals->version_string,
908 SMB3ANY_VERSION_STRING) == 0) ||
909 (strcmp(server->vals->version_string,
910 SMBDEFAULT_VERSION_STRING) == 0))
911 assemble_neg_contexts(req, server, &total_len);
912 }
913 iov[0].iov_base = (char *)req;
914 iov[0].iov_len = total_len;
915
916 memset(&rqst, 0, sizeof(struct smb_rqst));
917 rqst.rq_iov = iov;
918 rqst.rq_nvec = 1;
919
920 rc = cifs_send_recv(xid, ses, server,
921 &rqst, &resp_buftype, flags, &rsp_iov);
922 cifs_small_buf_release(req);
923 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
924 /*
925 * No tcon so can't do
926 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
927 */
928 if (rc == -EOPNOTSUPP) {
929 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");
930 goto neg_exit;
931 } else if (rc != 0)
932 goto neg_exit;
933
934 if (strcmp(server->vals->version_string,
935 SMB3ANY_VERSION_STRING) == 0) {
936 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
937 cifs_server_dbg(VFS,
938 "SMB2 dialect returned but not requested\n");
939 return -EIO;
940 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
941 cifs_server_dbg(VFS,
942 "SMB2.1 dialect returned but not requested\n");
943 return -EIO;
944 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
945 /* ops set to 3.0 by default for default so update */
946 server->ops = &smb311_operations;
947 server->vals = &smb311_values;
948 }
949 } else if (strcmp(server->vals->version_string,
950 SMBDEFAULT_VERSION_STRING) == 0) {
951 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
952 cifs_server_dbg(VFS,
953 "SMB2 dialect returned but not requested\n");
954 return -EIO;
955 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
956 /* ops set to 3.0 by default for default so update */
957 server->ops = &smb21_operations;
958 server->vals = &smb21_values;
959 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
960 server->ops = &smb311_operations;
961 server->vals = &smb311_values;
962 }
963 } else if (le16_to_cpu(rsp->DialectRevision) !=
964 server->vals->protocol_id) {
965 /* if requested single dialect ensure returned dialect matched */
966 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
967 le16_to_cpu(rsp->DialectRevision));
968 return -EIO;
969 }
970
971 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
972
973 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
974 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
975 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
976 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
977 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
978 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
979 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
980 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
981 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
982 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
983 else {
984 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
985 le16_to_cpu(rsp->DialectRevision));
986 rc = -EIO;
987 goto neg_exit;
988 }
989 server->dialect = le16_to_cpu(rsp->DialectRevision);
990
991 /*
992 * Keep a copy of the hash after negprot. This hash will be
993 * the starting hash value for all sessions made from this
994 * server.
995 */
996 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
997 SMB2_PREAUTH_HASH_SIZE);
998
999 /* SMB2 only has an extended negflavor */
1000 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1001 /* set it to the maximum buffer size value we can send with 1 credit */
1002 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1003 SMB2_MAX_BUFFER_SIZE);
1004 server->max_read = le32_to_cpu(rsp->MaxReadSize);
1005 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1006 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1007 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1008 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1009 server->sec_mode);
1010 server->capabilities = le32_to_cpu(rsp->Capabilities);
1011 /* Internal types */
1012 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1013
1014 /*
1015 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1016 * Set the cipher type manually.
1017 */
1018 if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1019 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1020
1021 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1022 (struct smb2_sync_hdr *)rsp);
1023 /*
1024 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1025 * for us will be
1026 * ses->sectype = RawNTLMSSP;
1027 * but for time being this is our only auth choice so doesn't matter.
1028 * We just found a server which sets blob length to zero expecting raw.
1029 */
1030 if (blob_length == 0) {
1031 cifs_dbg(FYI, "missing security blob on negprot\n");
1032 server->sec_ntlmssp = true;
1033 }
1034
1035 rc = cifs_enable_signing(server, ses->sign);
1036 if (rc)
1037 goto neg_exit;
1038 if (blob_length) {
1039 rc = decode_negTokenInit(security_blob, blob_length, server);
1040 if (rc == 1)
1041 rc = 0;
1042 else if (rc == 0)
1043 rc = -EIO;
1044 }
1045
1046 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1047 if (rsp->NegotiateContextCount)
1048 rc = smb311_decode_neg_context(rsp, server,
1049 rsp_iov.iov_len);
1050 else
1051 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1052 }
1053neg_exit:
1054 free_rsp_buf(resp_buftype, rsp);
1055 return rc;
1056}
1057
1058int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1059{
1060 int rc;
1061 struct validate_negotiate_info_req *pneg_inbuf;
1062 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1063 u32 rsplen;
1064 u32 inbuflen; /* max of 4 dialects */
1065 struct TCP_Server_Info *server = tcon->ses->server;
1066
1067 cifs_dbg(FYI, "validate negotiate\n");
1068
1069 /* In SMB3.11 preauth integrity supersedes validate negotiate */
1070 if (server->dialect == SMB311_PROT_ID)
1071 return 0;
1072
1073 /*
1074 * validation ioctl must be signed, so no point sending this if we
1075 * can not sign it (ie are not known user). Even if signing is not
1076 * required (enabled but not negotiated), in those cases we selectively
1077 * sign just this, the first and only signed request on a connection.
1078 * Having validation of negotiate info helps reduce attack vectors.
1079 */
1080 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1081 return 0; /* validation requires signing */
1082
1083 if (tcon->ses->user_name == NULL) {
1084 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1085 return 0; /* validation requires signing */
1086 }
1087
1088 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1089 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1090
1091 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1092 if (!pneg_inbuf)
1093 return -ENOMEM;
1094
1095 pneg_inbuf->Capabilities =
1096 cpu_to_le32(server->vals->req_capabilities);
1097 if (tcon->ses->chan_max > 1)
1098 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1099
1100 memcpy(pneg_inbuf->Guid, server->client_guid,
1101 SMB2_CLIENT_GUID_SIZE);
1102
1103 if (tcon->ses->sign)
1104 pneg_inbuf->SecurityMode =
1105 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1106 else if (global_secflags & CIFSSEC_MAY_SIGN)
1107 pneg_inbuf->SecurityMode =
1108 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1109 else
1110 pneg_inbuf->SecurityMode = 0;
1111
1112
1113 if (strcmp(server->vals->version_string,
1114 SMB3ANY_VERSION_STRING) == 0) {
1115 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1116 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1117 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1118 pneg_inbuf->DialectCount = cpu_to_le16(3);
1119 /* SMB 2.1 not included so subtract one dialect from len */
1120 inbuflen = sizeof(*pneg_inbuf) -
1121 (sizeof(pneg_inbuf->Dialects[0]));
1122 } else if (strcmp(server->vals->version_string,
1123 SMBDEFAULT_VERSION_STRING) == 0) {
1124 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1125 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1126 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1127 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1128 pneg_inbuf->DialectCount = cpu_to_le16(4);
1129 /* structure is big enough for 4 dialects */
1130 inbuflen = sizeof(*pneg_inbuf);
1131 } else {
1132 /* otherwise specific dialect was requested */
1133 pneg_inbuf->Dialects[0] =
1134 cpu_to_le16(server->vals->protocol_id);
1135 pneg_inbuf->DialectCount = cpu_to_le16(1);
1136 /* structure is big enough for 3 dialects, sending only 1 */
1137 inbuflen = sizeof(*pneg_inbuf) -
1138 sizeof(pneg_inbuf->Dialects[0]) * 2;
1139 }
1140
1141 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1142 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1143 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1144 (char **)&pneg_rsp, &rsplen);
1145 if (rc == -EOPNOTSUPP) {
1146 /*
1147 * Old Windows versions or Netapp SMB server can return
1148 * not supported error. Client should accept it.
1149 */
1150 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1151 rc = 0;
1152 goto out_free_inbuf;
1153 } else if (rc != 0) {
1154 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1155 rc);
1156 rc = -EIO;
1157 goto out_free_inbuf;
1158 }
1159
1160 rc = -EIO;
1161 if (rsplen != sizeof(*pneg_rsp)) {
1162 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1163 rsplen);
1164
1165 /* relax check since Mac returns max bufsize allowed on ioctl */
1166 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1167 goto out_free_rsp;
1168 }
1169
1170 /* check validate negotiate info response matches what we got earlier */
1171 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1172 goto vneg_out;
1173
1174 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1175 goto vneg_out;
1176
1177 /* do not validate server guid because not saved at negprot time yet */
1178
1179 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1180 SMB2_LARGE_FILES) != server->capabilities)
1181 goto vneg_out;
1182
1183 /* validate negotiate successful */
1184 rc = 0;
1185 cifs_dbg(FYI, "validate negotiate info successful\n");
1186 goto out_free_rsp;
1187
1188vneg_out:
1189 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1190out_free_rsp:
1191 kfree(pneg_rsp);
1192out_free_inbuf:
1193 kfree(pneg_inbuf);
1194 return rc;
1195}
1196
1197enum securityEnum
1198smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1199{
1200 switch (requested) {
1201 case Kerberos:
1202 case RawNTLMSSP:
1203 return requested;
1204 case NTLMv2:
1205 return RawNTLMSSP;
1206 case Unspecified:
1207 if (server->sec_ntlmssp &&
1208 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1209 return RawNTLMSSP;
1210 if ((server->sec_kerberos || server->sec_mskerberos) &&
1211 (global_secflags & CIFSSEC_MAY_KRB5))
1212 return Kerberos;
1213 fallthrough;
1214 default:
1215 return Unspecified;
1216 }
1217}
1218
1219struct SMB2_sess_data {
1220 unsigned int xid;
1221 struct cifs_ses *ses;
1222 struct nls_table *nls_cp;
1223 void (*func)(struct SMB2_sess_data *);
1224 int result;
1225 u64 previous_session;
1226
1227 /* we will send the SMB in three pieces:
1228 * a fixed length beginning part, an optional
1229 * SPNEGO blob (which can be zero length), and a
1230 * last part which will include the strings
1231 * and rest of bcc area. This allows us to avoid
1232 * a large buffer 17K allocation
1233 */
1234 int buf0_type;
1235 struct kvec iov[2];
1236};
1237
1238static int
1239SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1240{
1241 int rc;
1242 struct cifs_ses *ses = sess_data->ses;
1243 struct smb2_sess_setup_req *req;
1244 struct TCP_Server_Info *server = cifs_ses_server(ses);
1245 unsigned int total_len;
1246
1247 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1248 (void **) &req,
1249 &total_len);
1250 if (rc)
1251 return rc;
1252
1253 if (sess_data->ses->binding) {
1254 req->sync_hdr.SessionId = sess_data->ses->Suid;
1255 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1256 req->PreviousSessionId = 0;
1257 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1258 } else {
1259 /* First session, not a reauthenticate */
1260 req->sync_hdr.SessionId = 0;
1261 /*
1262 * if reconnect, we need to send previous sess id
1263 * otherwise it is 0
1264 */
1265 req->PreviousSessionId = sess_data->previous_session;
1266 req->Flags = 0; /* MBZ */
1267 }
1268
1269 /* enough to enable echos and oplocks and one max size write */
1270 req->sync_hdr.CreditRequest = cpu_to_le16(130);
1271
1272 /* only one of SMB2 signing flags may be set in SMB2 request */
1273 if (server->sign)
1274 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1275 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1276 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1277 else
1278 req->SecurityMode = 0;
1279
1280#ifdef CONFIG_CIFS_DFS_UPCALL
1281 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1282#else
1283 req->Capabilities = 0;
1284#endif /* DFS_UPCALL */
1285
1286 req->Channel = 0; /* MBZ */
1287
1288 sess_data->iov[0].iov_base = (char *)req;
1289 /* 1 for pad */
1290 sess_data->iov[0].iov_len = total_len - 1;
1291 /*
1292 * This variable will be used to clear the buffer
1293 * allocated above in case of any error in the calling function.
1294 */
1295 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1296
1297 return 0;
1298}
1299
1300static void
1301SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1302{
1303 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1304 sess_data->buf0_type = CIFS_NO_BUFFER;
1305}
1306
1307static int
1308SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1309{
1310 int rc;
1311 struct smb_rqst rqst;
1312 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1313 struct kvec rsp_iov = { NULL, 0 };
1314
1315 /* Testing shows that buffer offset must be at location of Buffer[0] */
1316 req->SecurityBufferOffset =
1317 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1318 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1319
1320 memset(&rqst, 0, sizeof(struct smb_rqst));
1321 rqst.rq_iov = sess_data->iov;
1322 rqst.rq_nvec = 2;
1323
1324 /* BB add code to build os and lm fields */
1325 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1326 cifs_ses_server(sess_data->ses),
1327 &rqst,
1328 &sess_data->buf0_type,
1329 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1330 cifs_small_buf_release(sess_data->iov[0].iov_base);
1331 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1332
1333 return rc;
1334}
1335
1336static int
1337SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1338{
1339 int rc = 0;
1340 struct cifs_ses *ses = sess_data->ses;
1341 struct TCP_Server_Info *server = cifs_ses_server(ses);
1342
1343 mutex_lock(&server->srv_mutex);
1344 if (server->ops->generate_signingkey) {
1345 rc = server->ops->generate_signingkey(ses);
1346 if (rc) {
1347 cifs_dbg(FYI,
1348 "SMB3 session key generation failed\n");
1349 mutex_unlock(&server->srv_mutex);
1350 return rc;
1351 }
1352 }
1353 if (!server->session_estab) {
1354 server->sequence_number = 0x2;
1355 server->session_estab = true;
1356 }
1357 mutex_unlock(&server->srv_mutex);
1358
1359 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1360 /* keep existing ses state if binding */
1361 if (!ses->binding) {
1362 spin_lock(&GlobalMid_Lock);
1363 ses->status = CifsGood;
1364 ses->need_reconnect = false;
1365 spin_unlock(&GlobalMid_Lock);
1366 }
1367
1368 return rc;
1369}
1370
1371#ifdef CONFIG_CIFS_UPCALL
1372static void
1373SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1374{
1375 int rc;
1376 struct cifs_ses *ses = sess_data->ses;
1377 struct cifs_spnego_msg *msg;
1378 struct key *spnego_key = NULL;
1379 struct smb2_sess_setup_rsp *rsp = NULL;
1380
1381 rc = SMB2_sess_alloc_buffer(sess_data);
1382 if (rc)
1383 goto out;
1384
1385 spnego_key = cifs_get_spnego_key(ses);
1386 if (IS_ERR(spnego_key)) {
1387 rc = PTR_ERR(spnego_key);
1388 if (rc == -ENOKEY)
1389 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1390 spnego_key = NULL;
1391 goto out;
1392 }
1393
1394 msg = spnego_key->payload.data[0];
1395 /*
1396 * check version field to make sure that cifs.upcall is
1397 * sending us a response in an expected form
1398 */
1399 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1400 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1401 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1402 rc = -EKEYREJECTED;
1403 goto out_put_spnego_key;
1404 }
1405
1406 /* keep session key if binding */
1407 if (!ses->binding) {
1408 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1409 GFP_KERNEL);
1410 if (!ses->auth_key.response) {
1411 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1412 msg->sesskey_len);
1413 rc = -ENOMEM;
1414 goto out_put_spnego_key;
1415 }
1416 ses->auth_key.len = msg->sesskey_len;
1417 }
1418
1419 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1420 sess_data->iov[1].iov_len = msg->secblob_len;
1421
1422 rc = SMB2_sess_sendreceive(sess_data);
1423 if (rc)
1424 goto out_put_spnego_key;
1425
1426 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1427 /* keep session id and flags if binding */
1428 if (!ses->binding) {
1429 ses->Suid = rsp->sync_hdr.SessionId;
1430 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1431 }
1432
1433 rc = SMB2_sess_establish_session(sess_data);
1434out_put_spnego_key:
1435 key_invalidate(spnego_key);
1436 key_put(spnego_key);
1437out:
1438 sess_data->result = rc;
1439 sess_data->func = NULL;
1440 SMB2_sess_free_buffer(sess_data);
1441}
1442#else
1443static void
1444SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1445{
1446 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1447 sess_data->result = -EOPNOTSUPP;
1448 sess_data->func = NULL;
1449}
1450#endif
1451
1452static void
1453SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1454
1455static void
1456SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1457{
1458 int rc;
1459 struct cifs_ses *ses = sess_data->ses;
1460 struct smb2_sess_setup_rsp *rsp = NULL;
1461 char *ntlmssp_blob = NULL;
1462 bool use_spnego = false; /* else use raw ntlmssp */
1463 u16 blob_length = 0;
1464
1465 /*
1466 * If memory allocation is successful, caller of this function
1467 * frees it.
1468 */
1469 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1470 if (!ses->ntlmssp) {
1471 rc = -ENOMEM;
1472 goto out_err;
1473 }
1474 ses->ntlmssp->sesskey_per_smbsess = true;
1475
1476 rc = SMB2_sess_alloc_buffer(sess_data);
1477 if (rc)
1478 goto out_err;
1479
1480 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1481 GFP_KERNEL);
1482 if (ntlmssp_blob == NULL) {
1483 rc = -ENOMEM;
1484 goto out;
1485 }
1486
1487 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1488 if (use_spnego) {
1489 /* BB eventually need to add this */
1490 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1491 rc = -EOPNOTSUPP;
1492 goto out;
1493 } else {
1494 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1495 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1496 }
1497 sess_data->iov[1].iov_base = ntlmssp_blob;
1498 sess_data->iov[1].iov_len = blob_length;
1499
1500 rc = SMB2_sess_sendreceive(sess_data);
1501 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1502
1503 /* If true, rc here is expected and not an error */
1504 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1505 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1506 rc = 0;
1507
1508 if (rc)
1509 goto out;
1510
1511 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1512 le16_to_cpu(rsp->SecurityBufferOffset)) {
1513 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1514 le16_to_cpu(rsp->SecurityBufferOffset));
1515 rc = -EIO;
1516 goto out;
1517 }
1518 rc = decode_ntlmssp_challenge(rsp->Buffer,
1519 le16_to_cpu(rsp->SecurityBufferLength), ses);
1520 if (rc)
1521 goto out;
1522
1523 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1524
1525 /* keep existing ses id and flags if binding */
1526 if (!ses->binding) {
1527 ses->Suid = rsp->sync_hdr.SessionId;
1528 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1529 }
1530
1531out:
1532 kfree(ntlmssp_blob);
1533 SMB2_sess_free_buffer(sess_data);
1534 if (!rc) {
1535 sess_data->result = 0;
1536 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1537 return;
1538 }
1539out_err:
1540 kfree(ses->ntlmssp);
1541 ses->ntlmssp = NULL;
1542 sess_data->result = rc;
1543 sess_data->func = NULL;
1544}
1545
1546static void
1547SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1548{
1549 int rc;
1550 struct cifs_ses *ses = sess_data->ses;
1551 struct smb2_sess_setup_req *req;
1552 struct smb2_sess_setup_rsp *rsp = NULL;
1553 unsigned char *ntlmssp_blob = NULL;
1554 bool use_spnego = false; /* else use raw ntlmssp */
1555 u16 blob_length = 0;
1556
1557 rc = SMB2_sess_alloc_buffer(sess_data);
1558 if (rc)
1559 goto out;
1560
1561 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1562 req->sync_hdr.SessionId = ses->Suid;
1563
1564 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1565 sess_data->nls_cp);
1566 if (rc) {
1567 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1568 goto out;
1569 }
1570
1571 if (use_spnego) {
1572 /* BB eventually need to add this */
1573 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1574 rc = -EOPNOTSUPP;
1575 goto out;
1576 }
1577 sess_data->iov[1].iov_base = ntlmssp_blob;
1578 sess_data->iov[1].iov_len = blob_length;
1579
1580 rc = SMB2_sess_sendreceive(sess_data);
1581 if (rc)
1582 goto out;
1583
1584 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1585
1586 /* keep existing ses id and flags if binding */
1587 if (!ses->binding) {
1588 ses->Suid = rsp->sync_hdr.SessionId;
1589 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1590 }
1591
1592 rc = SMB2_sess_establish_session(sess_data);
1593#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1594 if (ses->server->dialect < SMB30_PROT_ID) {
1595 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1596 /*
1597 * The session id is opaque in terms of endianness, so we can't
1598 * print it as a long long. we dump it as we got it on the wire
1599 */
1600 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
1601 &ses->Suid);
1602 cifs_dbg(VFS, "Session Key %*ph\n",
1603 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1604 cifs_dbg(VFS, "Signing Key %*ph\n",
1605 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1606 }
1607#endif
1608out:
1609 kfree(ntlmssp_blob);
1610 SMB2_sess_free_buffer(sess_data);
1611 kfree(ses->ntlmssp);
1612 ses->ntlmssp = NULL;
1613 sess_data->result = rc;
1614 sess_data->func = NULL;
1615}
1616
1617static int
1618SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1619{
1620 int type;
1621
1622 type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1623 cifs_dbg(FYI, "sess setup type %d\n", type);
1624 if (type == Unspecified) {
1625 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1626 return -EINVAL;
1627 }
1628
1629 switch (type) {
1630 case Kerberos:
1631 sess_data->func = SMB2_auth_kerberos;
1632 break;
1633 case RawNTLMSSP:
1634 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1635 break;
1636 default:
1637 cifs_dbg(VFS, "secType %d not supported!\n", type);
1638 return -EOPNOTSUPP;
1639 }
1640
1641 return 0;
1642}
1643
1644int
1645SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1646 const struct nls_table *nls_cp)
1647{
1648 int rc = 0;
1649 struct TCP_Server_Info *server = cifs_ses_server(ses);
1650 struct SMB2_sess_data *sess_data;
1651
1652 cifs_dbg(FYI, "Session Setup\n");
1653
1654 if (!server) {
1655 WARN(1, "%s: server is NULL!\n", __func__);
1656 return -EIO;
1657 }
1658
1659 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1660 if (!sess_data)
1661 return -ENOMEM;
1662
1663 rc = SMB2_select_sec(ses, sess_data);
1664 if (rc)
1665 goto out;
1666 sess_data->xid = xid;
1667 sess_data->ses = ses;
1668 sess_data->buf0_type = CIFS_NO_BUFFER;
1669 sess_data->nls_cp = (struct nls_table *) nls_cp;
1670 sess_data->previous_session = ses->Suid;
1671
1672 /*
1673 * Initialize the session hash with the server one.
1674 */
1675 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1676 SMB2_PREAUTH_HASH_SIZE);
1677
1678 while (sess_data->func)
1679 sess_data->func(sess_data);
1680
1681 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1682 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1683 rc = sess_data->result;
1684out:
1685 kfree(sess_data);
1686 return rc;
1687}
1688
1689int
1690SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1691{
1692 struct smb_rqst rqst;
1693 struct smb2_logoff_req *req; /* response is also trivial struct */
1694 int rc = 0;
1695 struct TCP_Server_Info *server;
1696 int flags = 0;
1697 unsigned int total_len;
1698 struct kvec iov[1];
1699 struct kvec rsp_iov;
1700 int resp_buf_type;
1701
1702 cifs_dbg(FYI, "disconnect session %p\n", ses);
1703
1704 if (ses && (ses->server))
1705 server = ses->server;
1706 else
1707 return -EIO;
1708
1709 /* no need to send SMB logoff if uid already closed due to reconnect */
1710 if (ses->need_reconnect)
1711 goto smb2_session_already_dead;
1712
1713 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1714 (void **) &req, &total_len);
1715 if (rc)
1716 return rc;
1717
1718 /* since no tcon, smb2_init can not do this, so do here */
1719 req->sync_hdr.SessionId = ses->Suid;
1720
1721 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1722 flags |= CIFS_TRANSFORM_REQ;
1723 else if (server->sign)
1724 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1725
1726 flags |= CIFS_NO_RSP_BUF;
1727
1728 iov[0].iov_base = (char *)req;
1729 iov[0].iov_len = total_len;
1730
1731 memset(&rqst, 0, sizeof(struct smb_rqst));
1732 rqst.rq_iov = iov;
1733 rqst.rq_nvec = 1;
1734
1735 rc = cifs_send_recv(xid, ses, ses->server,
1736 &rqst, &resp_buf_type, flags, &rsp_iov);
1737 cifs_small_buf_release(req);
1738 /*
1739 * No tcon so can't do
1740 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1741 */
1742
1743smb2_session_already_dead:
1744 return rc;
1745}
1746
1747static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1748{
1749 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1750}
1751
1752#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1753
1754/* These are similar values to what Windows uses */
1755static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1756{
1757 tcon->max_chunks = 256;
1758 tcon->max_bytes_chunk = 1048576;
1759 tcon->max_bytes_copy = 16777216;
1760}
1761
1762int
1763SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1764 struct cifs_tcon *tcon, const struct nls_table *cp)
1765{
1766 struct smb_rqst rqst;
1767 struct smb2_tree_connect_req *req;
1768 struct smb2_tree_connect_rsp *rsp = NULL;
1769 struct kvec iov[2];
1770 struct kvec rsp_iov = { NULL, 0 };
1771 int rc = 0;
1772 int resp_buftype;
1773 int unc_path_len;
1774 __le16 *unc_path = NULL;
1775 int flags = 0;
1776 unsigned int total_len;
1777 struct TCP_Server_Info *server;
1778
1779 /* always use master channel */
1780 server = ses->server;
1781
1782 cifs_dbg(FYI, "TCON\n");
1783
1784 if (!server || !tree)
1785 return -EIO;
1786
1787 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1788 if (unc_path == NULL)
1789 return -ENOMEM;
1790
1791 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1792 unc_path_len *= 2;
1793 if (unc_path_len < 2) {
1794 kfree(unc_path);
1795 return -EINVAL;
1796 }
1797
1798 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1799 tcon->tid = 0;
1800 atomic_set(&tcon->num_remote_opens, 0);
1801 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1802 (void **) &req, &total_len);
1803 if (rc) {
1804 kfree(unc_path);
1805 return rc;
1806 }
1807
1808 if (smb3_encryption_required(tcon))
1809 flags |= CIFS_TRANSFORM_REQ;
1810
1811 iov[0].iov_base = (char *)req;
1812 /* 1 for pad */
1813 iov[0].iov_len = total_len - 1;
1814
1815 /* Testing shows that buffer offset must be at location of Buffer[0] */
1816 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1817 - 1 /* pad */);
1818 req->PathLength = cpu_to_le16(unc_path_len - 2);
1819 iov[1].iov_base = unc_path;
1820 iov[1].iov_len = unc_path_len;
1821
1822 /*
1823 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1824 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1825 * (Samba servers don't always set the flag so also check if null user)
1826 */
1827 if ((server->dialect == SMB311_PROT_ID) &&
1828 !smb3_encryption_required(tcon) &&
1829 !(ses->session_flags &
1830 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1831 ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1832 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1833
1834 memset(&rqst, 0, sizeof(struct smb_rqst));
1835 rqst.rq_iov = iov;
1836 rqst.rq_nvec = 2;
1837
1838 /* Need 64 for max size write so ask for more in case not there yet */
1839 req->sync_hdr.CreditRequest = cpu_to_le16(64);
1840
1841 rc = cifs_send_recv(xid, ses, server,
1842 &rqst, &resp_buftype, flags, &rsp_iov);
1843 cifs_small_buf_release(req);
1844 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1845 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1846 if (rc != 0) {
1847 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1848 tcon->need_reconnect = true;
1849 goto tcon_error_exit;
1850 }
1851
1852 switch (rsp->ShareType) {
1853 case SMB2_SHARE_TYPE_DISK:
1854 cifs_dbg(FYI, "connection to disk share\n");
1855 break;
1856 case SMB2_SHARE_TYPE_PIPE:
1857 tcon->pipe = true;
1858 cifs_dbg(FYI, "connection to pipe share\n");
1859 break;
1860 case SMB2_SHARE_TYPE_PRINT:
1861 tcon->print = true;
1862 cifs_dbg(FYI, "connection to printer\n");
1863 break;
1864 default:
1865 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1866 rc = -EOPNOTSUPP;
1867 goto tcon_error_exit;
1868 }
1869
1870 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1871 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1872 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1873 tcon->tidStatus = CifsGood;
1874 tcon->need_reconnect = false;
1875 tcon->tid = rsp->sync_hdr.TreeId;
1876 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1877
1878 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1879 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1880 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1881
1882 if (tcon->seal &&
1883 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1884 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1885
1886 init_copy_chunk_defaults(tcon);
1887 if (server->ops->validate_negotiate)
1888 rc = server->ops->validate_negotiate(xid, tcon);
1889tcon_exit:
1890
1891 free_rsp_buf(resp_buftype, rsp);
1892 kfree(unc_path);
1893 return rc;
1894
1895tcon_error_exit:
1896 if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1897 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1898 }
1899 goto tcon_exit;
1900}
1901
1902int
1903SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1904{
1905 struct smb_rqst rqst;
1906 struct smb2_tree_disconnect_req *req; /* response is trivial */
1907 int rc = 0;
1908 struct cifs_ses *ses = tcon->ses;
1909 int flags = 0;
1910 unsigned int total_len;
1911 struct kvec iov[1];
1912 struct kvec rsp_iov;
1913 int resp_buf_type;
1914
1915 cifs_dbg(FYI, "Tree Disconnect\n");
1916
1917 if (!ses || !(ses->server))
1918 return -EIO;
1919
1920 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1921 return 0;
1922
1923 close_cached_dir_lease(&tcon->crfid);
1924
1925 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1926 (void **) &req,
1927 &total_len);
1928 if (rc)
1929 return rc;
1930
1931 if (smb3_encryption_required(tcon))
1932 flags |= CIFS_TRANSFORM_REQ;
1933
1934 flags |= CIFS_NO_RSP_BUF;
1935
1936 iov[0].iov_base = (char *)req;
1937 iov[0].iov_len = total_len;
1938
1939 memset(&rqst, 0, sizeof(struct smb_rqst));
1940 rqst.rq_iov = iov;
1941 rqst.rq_nvec = 1;
1942
1943 rc = cifs_send_recv(xid, ses, ses->server,
1944 &rqst, &resp_buf_type, flags, &rsp_iov);
1945 cifs_small_buf_release(req);
1946 if (rc)
1947 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1948
1949 return rc;
1950}
1951
1952
1953static struct create_durable *
1954create_durable_buf(void)
1955{
1956 struct create_durable *buf;
1957
1958 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1959 if (!buf)
1960 return NULL;
1961
1962 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1963 (struct create_durable, Data));
1964 buf->ccontext.DataLength = cpu_to_le32(16);
1965 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1966 (struct create_durable, Name));
1967 buf->ccontext.NameLength = cpu_to_le16(4);
1968 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1969 buf->Name[0] = 'D';
1970 buf->Name[1] = 'H';
1971 buf->Name[2] = 'n';
1972 buf->Name[3] = 'Q';
1973 return buf;
1974}
1975
1976static struct create_durable *
1977create_reconnect_durable_buf(struct cifs_fid *fid)
1978{
1979 struct create_durable *buf;
1980
1981 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1982 if (!buf)
1983 return NULL;
1984
1985 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1986 (struct create_durable, Data));
1987 buf->ccontext.DataLength = cpu_to_le32(16);
1988 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1989 (struct create_durable, Name));
1990 buf->ccontext.NameLength = cpu_to_le16(4);
1991 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1992 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1993 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1994 buf->Name[0] = 'D';
1995 buf->Name[1] = 'H';
1996 buf->Name[2] = 'n';
1997 buf->Name[3] = 'C';
1998 return buf;
1999}
2000
2001static void
2002parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2003{
2004 struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2005
2006 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2007 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2008 buf->IndexNumber = pdisk_id->DiskFileId;
2009}
2010
2011static void
2012parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2013 struct create_posix_rsp *posix)
2014{
2015 int sid_len;
2016 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2017 u8 *end = beg + le32_to_cpu(cc->DataLength);
2018 u8 *sid;
2019
2020 memset(posix, 0, sizeof(*posix));
2021
2022 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2023 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2024 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2025
2026 sid = beg + 12;
2027 sid_len = posix_info_sid_size(sid, end);
2028 if (sid_len < 0) {
2029 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2030 return;
2031 }
2032 memcpy(&posix->owner, sid, sid_len);
2033
2034 sid = sid + sid_len;
2035 sid_len = posix_info_sid_size(sid, end);
2036 if (sid_len < 0) {
2037 cifs_dbg(VFS, "bad group sid in posix create response\n");
2038 return;
2039 }
2040 memcpy(&posix->group, sid, sid_len);
2041
2042 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2043 posix->nlink, posix->mode, posix->reparse_tag);
2044}
2045
2046void
2047smb2_parse_contexts(struct TCP_Server_Info *server,
2048 struct smb2_create_rsp *rsp,
2049 unsigned int *epoch, char *lease_key, __u8 *oplock,
2050 struct smb2_file_all_info *buf,
2051 struct create_posix_rsp *posix)
2052{
2053 char *data_offset;
2054 struct create_context *cc;
2055 unsigned int next;
2056 unsigned int remaining;
2057 char *name;
2058 static const char smb3_create_tag_posix[] = {
2059 0x93, 0xAD, 0x25, 0x50, 0x9C,
2060 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2061 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2062 };
2063
2064 *oplock = 0;
2065 data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2066 remaining = le32_to_cpu(rsp->CreateContextsLength);
2067 cc = (struct create_context *)data_offset;
2068
2069 /* Initialize inode number to 0 in case no valid data in qfid context */
2070 if (buf)
2071 buf->IndexNumber = 0;
2072
2073 while (remaining >= sizeof(struct create_context)) {
2074 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2075 if (le16_to_cpu(cc->NameLength) == 4 &&
2076 strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2077 *oplock = server->ops->parse_lease_buf(cc, epoch,
2078 lease_key);
2079 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2080 strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2081 parse_query_id_ctxt(cc, buf);
2082 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2083 if (posix &&
2084 memcmp(name, smb3_create_tag_posix, 16) == 0)
2085 parse_posix_ctxt(cc, buf, posix);
2086 }
2087 /* else {
2088 cifs_dbg(FYI, "Context not matched with len %d\n",
2089 le16_to_cpu(cc->NameLength));
2090 cifs_dump_mem("Cctxt name: ", name, 4);
2091 } */
2092
2093 next = le32_to_cpu(cc->Next);
2094 if (!next)
2095 break;
2096 remaining -= next;
2097 cc = (struct create_context *)((char *)cc + next);
2098 }
2099
2100 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2101 *oplock = rsp->OplockLevel;
2102
2103 return;
2104}
2105
2106static int
2107add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2108 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2109{
2110 struct smb2_create_req *req = iov[0].iov_base;
2111 unsigned int num = *num_iovec;
2112
2113 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2114 if (iov[num].iov_base == NULL)
2115 return -ENOMEM;
2116 iov[num].iov_len = server->vals->create_lease_size;
2117 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2118 if (!req->CreateContextsOffset)
2119 req->CreateContextsOffset = cpu_to_le32(
2120 sizeof(struct smb2_create_req) +
2121 iov[num - 1].iov_len);
2122 le32_add_cpu(&req->CreateContextsLength,
2123 server->vals->create_lease_size);
2124 *num_iovec = num + 1;
2125 return 0;
2126}
2127
2128static struct create_durable_v2 *
2129create_durable_v2_buf(struct cifs_open_parms *oparms)
2130{
2131 struct cifs_fid *pfid = oparms->fid;
2132 struct create_durable_v2 *buf;
2133
2134 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2135 if (!buf)
2136 return NULL;
2137
2138 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2139 (struct create_durable_v2, dcontext));
2140 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2141 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2142 (struct create_durable_v2, Name));
2143 buf->ccontext.NameLength = cpu_to_le16(4);
2144
2145 /*
2146 * NB: Handle timeout defaults to 0, which allows server to choose
2147 * (most servers default to 120 seconds) and most clients default to 0.
2148 * This can be overridden at mount ("handletimeout=") if the user wants
2149 * a different persistent (or resilient) handle timeout for all opens
2150 * opens on a particular SMB3 mount.
2151 */
2152 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2153 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2154 generate_random_uuid(buf->dcontext.CreateGuid);
2155 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2156
2157 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2158 buf->Name[0] = 'D';
2159 buf->Name[1] = 'H';
2160 buf->Name[2] = '2';
2161 buf->Name[3] = 'Q';
2162 return buf;
2163}
2164
2165static struct create_durable_handle_reconnect_v2 *
2166create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2167{
2168 struct create_durable_handle_reconnect_v2 *buf;
2169
2170 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2171 GFP_KERNEL);
2172 if (!buf)
2173 return NULL;
2174
2175 buf->ccontext.DataOffset =
2176 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2177 dcontext));
2178 buf->ccontext.DataLength =
2179 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2180 buf->ccontext.NameOffset =
2181 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2182 Name));
2183 buf->ccontext.NameLength = cpu_to_le16(4);
2184
2185 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2186 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2187 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2188 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2189
2190 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2191 buf->Name[0] = 'D';
2192 buf->Name[1] = 'H';
2193 buf->Name[2] = '2';
2194 buf->Name[3] = 'C';
2195 return buf;
2196}
2197
2198static int
2199add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2200 struct cifs_open_parms *oparms)
2201{
2202 struct smb2_create_req *req = iov[0].iov_base;
2203 unsigned int num = *num_iovec;
2204
2205 iov[num].iov_base = create_durable_v2_buf(oparms);
2206 if (iov[num].iov_base == NULL)
2207 return -ENOMEM;
2208 iov[num].iov_len = sizeof(struct create_durable_v2);
2209 if (!req->CreateContextsOffset)
2210 req->CreateContextsOffset =
2211 cpu_to_le32(sizeof(struct smb2_create_req) +
2212 iov[1].iov_len);
2213 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2214 *num_iovec = num + 1;
2215 return 0;
2216}
2217
2218static int
2219add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2220 struct cifs_open_parms *oparms)
2221{
2222 struct smb2_create_req *req = iov[0].iov_base;
2223 unsigned int num = *num_iovec;
2224
2225 /* indicate that we don't need to relock the file */
2226 oparms->reconnect = false;
2227
2228 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2229 if (iov[num].iov_base == NULL)
2230 return -ENOMEM;
2231 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2232 if (!req->CreateContextsOffset)
2233 req->CreateContextsOffset =
2234 cpu_to_le32(sizeof(struct smb2_create_req) +
2235 iov[1].iov_len);
2236 le32_add_cpu(&req->CreateContextsLength,
2237 sizeof(struct create_durable_handle_reconnect_v2));
2238 *num_iovec = num + 1;
2239 return 0;
2240}
2241
2242static int
2243add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2244 struct cifs_open_parms *oparms, bool use_persistent)
2245{
2246 struct smb2_create_req *req = iov[0].iov_base;
2247 unsigned int num = *num_iovec;
2248
2249 if (use_persistent) {
2250 if (oparms->reconnect)
2251 return add_durable_reconnect_v2_context(iov, num_iovec,
2252 oparms);
2253 else
2254 return add_durable_v2_context(iov, num_iovec, oparms);
2255 }
2256
2257 if (oparms->reconnect) {
2258 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2259 /* indicate that we don't need to relock the file */
2260 oparms->reconnect = false;
2261 } else
2262 iov[num].iov_base = create_durable_buf();
2263 if (iov[num].iov_base == NULL)
2264 return -ENOMEM;
2265 iov[num].iov_len = sizeof(struct create_durable);
2266 if (!req->CreateContextsOffset)
2267 req->CreateContextsOffset =
2268 cpu_to_le32(sizeof(struct smb2_create_req) +
2269 iov[1].iov_len);
2270 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2271 *num_iovec = num + 1;
2272 return 0;
2273}
2274
2275/* See MS-SMB2 2.2.13.2.7 */
2276static struct crt_twarp_ctxt *
2277create_twarp_buf(__u64 timewarp)
2278{
2279 struct crt_twarp_ctxt *buf;
2280
2281 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2282 if (!buf)
2283 return NULL;
2284
2285 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2286 (struct crt_twarp_ctxt, Timestamp));
2287 buf->ccontext.DataLength = cpu_to_le32(8);
2288 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2289 (struct crt_twarp_ctxt, Name));
2290 buf->ccontext.NameLength = cpu_to_le16(4);
2291 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2292 buf->Name[0] = 'T';
2293 buf->Name[1] = 'W';
2294 buf->Name[2] = 'r';
2295 buf->Name[3] = 'p';
2296 buf->Timestamp = cpu_to_le64(timewarp);
2297 return buf;
2298}
2299
2300/* See MS-SMB2 2.2.13.2.7 */
2301static int
2302add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2303{
2304 struct smb2_create_req *req = iov[0].iov_base;
2305 unsigned int num = *num_iovec;
2306
2307 iov[num].iov_base = create_twarp_buf(timewarp);
2308 if (iov[num].iov_base == NULL)
2309 return -ENOMEM;
2310 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2311 if (!req->CreateContextsOffset)
2312 req->CreateContextsOffset = cpu_to_le32(
2313 sizeof(struct smb2_create_req) +
2314 iov[num - 1].iov_len);
2315 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2316 *num_iovec = num + 1;
2317 return 0;
2318}
2319
2320/* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2321static void setup_owner_group_sids(char *buf)
2322{
2323 struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2324
2325 /* Populate the user ownership fields S-1-5-88-1 */
2326 sids->owner.Revision = 1;
2327 sids->owner.NumAuth = 3;
2328 sids->owner.Authority[5] = 5;
2329 sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2330 sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2331 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2332
2333 /* Populate the group ownership fields S-1-5-88-2 */
2334 sids->group.Revision = 1;
2335 sids->group.NumAuth = 3;
2336 sids->group.Authority[5] = 5;
2337 sids->group.SubAuthorities[0] = cpu_to_le32(88);
2338 sids->group.SubAuthorities[1] = cpu_to_le32(2);
2339 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2340
2341 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2342}
2343
2344/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2345static struct crt_sd_ctxt *
2346create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2347{
2348 struct crt_sd_ctxt *buf;
2349 __u8 *ptr, *aclptr;
2350 unsigned int acelen, acl_size, ace_count;
2351 unsigned int owner_offset = 0;
2352 unsigned int group_offset = 0;
2353 struct smb3_acl acl;
2354
2355 *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2356
2357 if (set_owner) {
2358 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2359 *len += sizeof(struct owner_group_sids);
2360 }
2361
2362 buf = kzalloc(*len, GFP_KERNEL);
2363 if (buf == NULL)
2364 return buf;
2365
2366 ptr = (__u8 *)&buf[1];
2367 if (set_owner) {
2368 /* offset fields are from beginning of security descriptor not of create context */
2369 owner_offset = ptr - (__u8 *)&buf->sd;
2370 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2371 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2372 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2373
2374 setup_owner_group_sids(ptr);
2375 ptr += sizeof(struct owner_group_sids);
2376 } else {
2377 buf->sd.OffsetOwner = 0;
2378 buf->sd.OffsetGroup = 0;
2379 }
2380
2381 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2382 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2383 buf->ccontext.NameLength = cpu_to_le16(4);
2384 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2385 buf->Name[0] = 'S';
2386 buf->Name[1] = 'e';
2387 buf->Name[2] = 'c';
2388 buf->Name[3] = 'D';
2389 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
2390
2391 /*
2392 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2393 * and "DP" ie the DACL is present
2394 */
2395 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2396
2397 /* offset owner, group and Sbz1 and SACL are all zero */
2398 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2399 /* Ship the ACL for now. we will copy it into buf later. */
2400 aclptr = ptr;
2401 ptr += sizeof(struct smb3_acl);
2402
2403 /* create one ACE to hold the mode embedded in reserved special SID */
2404 acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2405 ptr += acelen;
2406 acl_size = acelen + sizeof(struct smb3_acl);
2407 ace_count = 1;
2408
2409 if (set_owner) {
2410 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2411 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2412 ptr += acelen;
2413 acl_size += acelen;
2414 ace_count += 1;
2415 }
2416
2417 /* and one more ACE to allow access for authenticated users */
2418 acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2419 ptr += acelen;
2420 acl_size += acelen;
2421 ace_count += 1;
2422
2423 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2424 acl.AclSize = cpu_to_le16(acl_size);
2425 acl.AceCount = cpu_to_le16(ace_count);
2426 memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2427
2428 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2429 *len = roundup(ptr - (__u8 *)buf, 8);
2430
2431 return buf;
2432}
2433
2434static int
2435add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2436{
2437 struct smb2_create_req *req = iov[0].iov_base;
2438 unsigned int num = *num_iovec;
2439 unsigned int len = 0;
2440
2441 iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2442 if (iov[num].iov_base == NULL)
2443 return -ENOMEM;
2444 iov[num].iov_len = len;
2445 if (!req->CreateContextsOffset)
2446 req->CreateContextsOffset = cpu_to_le32(
2447 sizeof(struct smb2_create_req) +
2448 iov[num - 1].iov_len);
2449 le32_add_cpu(&req->CreateContextsLength, len);
2450 *num_iovec = num + 1;
2451 return 0;
2452}
2453
2454static struct crt_query_id_ctxt *
2455create_query_id_buf(void)
2456{
2457 struct crt_query_id_ctxt *buf;
2458
2459 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2460 if (!buf)
2461 return NULL;
2462
2463 buf->ccontext.DataOffset = cpu_to_le16(0);
2464 buf->ccontext.DataLength = cpu_to_le32(0);
2465 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2466 (struct crt_query_id_ctxt, Name));
2467 buf->ccontext.NameLength = cpu_to_le16(4);
2468 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2469 buf->Name[0] = 'Q';
2470 buf->Name[1] = 'F';
2471 buf->Name[2] = 'i';
2472 buf->Name[3] = 'd';
2473 return buf;
2474}
2475
2476/* See MS-SMB2 2.2.13.2.9 */
2477static int
2478add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2479{
2480 struct smb2_create_req *req = iov[0].iov_base;
2481 unsigned int num = *num_iovec;
2482
2483 iov[num].iov_base = create_query_id_buf();
2484 if (iov[num].iov_base == NULL)
2485 return -ENOMEM;
2486 iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2487 if (!req->CreateContextsOffset)
2488 req->CreateContextsOffset = cpu_to_le32(
2489 sizeof(struct smb2_create_req) +
2490 iov[num - 1].iov_len);
2491 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2492 *num_iovec = num + 1;
2493 return 0;
2494}
2495
2496static int
2497alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2498 const char *treename, const __le16 *path)
2499{
2500 int treename_len, path_len;
2501 struct nls_table *cp;
2502 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2503
2504 /*
2505 * skip leading "\\"
2506 */
2507 treename_len = strlen(treename);
2508 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2509 return -EINVAL;
2510
2511 treename += 2;
2512 treename_len -= 2;
2513
2514 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2515
2516 /*
2517 * make room for one path separator between the treename and
2518 * path
2519 */
2520 *out_len = treename_len + 1 + path_len;
2521
2522 /*
2523 * final path needs to be null-terminated UTF16 with a
2524 * size aligned to 8
2525 */
2526
2527 *out_size = roundup((*out_len+1)*2, 8);
2528 *out_path = kzalloc(*out_size, GFP_KERNEL);
2529 if (!*out_path)
2530 return -ENOMEM;
2531
2532 cp = load_nls_default();
2533 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2534 UniStrcat(*out_path, sep);
2535 UniStrcat(*out_path, path);
2536 unload_nls(cp);
2537
2538 return 0;
2539}
2540
2541int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2542 umode_t mode, struct cifs_tcon *tcon,
2543 const char *full_path,
2544 struct cifs_sb_info *cifs_sb)
2545{
2546 struct smb_rqst rqst;
2547 struct smb2_create_req *req;
2548 struct smb2_create_rsp *rsp = NULL;
2549 struct cifs_ses *ses = tcon->ses;
2550 struct kvec iov[3]; /* make sure at least one for each open context */
2551 struct kvec rsp_iov = {NULL, 0};
2552 int resp_buftype;
2553 int uni_path_len;
2554 __le16 *copy_path = NULL;
2555 int copy_size;
2556 int rc = 0;
2557 unsigned int n_iov = 2;
2558 __u32 file_attributes = 0;
2559 char *pc_buf = NULL;
2560 int flags = 0;
2561 unsigned int total_len;
2562 __le16 *utf16_path = NULL;
2563 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2564
2565 cifs_dbg(FYI, "mkdir\n");
2566
2567 /* resource #1: path allocation */
2568 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2569 if (!utf16_path)
2570 return -ENOMEM;
2571
2572 if (!ses || !server) {
2573 rc = -EIO;
2574 goto err_free_path;
2575 }
2576
2577 /* resource #2: request */
2578 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2579 (void **) &req, &total_len);
2580 if (rc)
2581 goto err_free_path;
2582
2583
2584 if (smb3_encryption_required(tcon))
2585 flags |= CIFS_TRANSFORM_REQ;
2586
2587 req->ImpersonationLevel = IL_IMPERSONATION;
2588 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2589 /* File attributes ignored on open (used in create though) */
2590 req->FileAttributes = cpu_to_le32(file_attributes);
2591 req->ShareAccess = FILE_SHARE_ALL_LE;
2592 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2593 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2594
2595 iov[0].iov_base = (char *)req;
2596 /* -1 since last byte is buf[0] which is sent below (path) */
2597 iov[0].iov_len = total_len - 1;
2598
2599 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2600
2601 /* [MS-SMB2] 2.2.13 NameOffset:
2602 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2603 * the SMB2 header, the file name includes a prefix that will
2604 * be processed during DFS name normalization as specified in
2605 * section 3.3.5.9. Otherwise, the file name is relative to
2606 * the share that is identified by the TreeId in the SMB2
2607 * header.
2608 */
2609 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2610 int name_len;
2611
2612 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2613 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2614 &name_len,
2615 tcon->treeName, utf16_path);
2616 if (rc)
2617 goto err_free_req;
2618
2619 req->NameLength = cpu_to_le16(name_len * 2);
2620 uni_path_len = copy_size;
2621 /* free before overwriting resource */
2622 kfree(utf16_path);
2623 utf16_path = copy_path;
2624 } else {
2625 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2626 /* MUST set path len (NameLength) to 0 opening root of share */
2627 req->NameLength = cpu_to_le16(uni_path_len - 2);
2628 if (uni_path_len % 8 != 0) {
2629 copy_size = roundup(uni_path_len, 8);
2630 copy_path = kzalloc(copy_size, GFP_KERNEL);
2631 if (!copy_path) {
2632 rc = -ENOMEM;
2633 goto err_free_req;
2634 }
2635 memcpy((char *)copy_path, (const char *)utf16_path,
2636 uni_path_len);
2637 uni_path_len = copy_size;
2638 /* free before overwriting resource */
2639 kfree(utf16_path);
2640 utf16_path = copy_path;
2641 }
2642 }
2643
2644 iov[1].iov_len = uni_path_len;
2645 iov[1].iov_base = utf16_path;
2646 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2647
2648 if (tcon->posix_extensions) {
2649 /* resource #3: posix buf */
2650 rc = add_posix_context(iov, &n_iov, mode);
2651 if (rc)
2652 goto err_free_req;
2653 pc_buf = iov[n_iov-1].iov_base;
2654 }
2655
2656
2657 memset(&rqst, 0, sizeof(struct smb_rqst));
2658 rqst.rq_iov = iov;
2659 rqst.rq_nvec = n_iov;
2660
2661 /* no need to inc num_remote_opens because we close it just below */
2662 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2663 FILE_WRITE_ATTRIBUTES);
2664 /* resource #4: response buffer */
2665 rc = cifs_send_recv(xid, ses, server,
2666 &rqst, &resp_buftype, flags, &rsp_iov);
2667 if (rc) {
2668 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2669 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2670 CREATE_NOT_FILE,
2671 FILE_WRITE_ATTRIBUTES, rc);
2672 goto err_free_rsp_buf;
2673 }
2674
2675 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2676 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2677 ses->Suid, CREATE_NOT_FILE,
2678 FILE_WRITE_ATTRIBUTES);
2679
2680 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2681
2682 /* Eventually save off posix specific response info and timestaps */
2683
2684err_free_rsp_buf:
2685 free_rsp_buf(resp_buftype, rsp);
2686 kfree(pc_buf);
2687err_free_req:
2688 cifs_small_buf_release(req);
2689err_free_path:
2690 kfree(utf16_path);
2691 return rc;
2692}
2693
2694int
2695SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2696 struct smb_rqst *rqst, __u8 *oplock,
2697 struct cifs_open_parms *oparms, __le16 *path)
2698{
2699 struct smb2_create_req *req;
2700 unsigned int n_iov = 2;
2701 __u32 file_attributes = 0;
2702 int copy_size;
2703 int uni_path_len;
2704 unsigned int total_len;
2705 struct kvec *iov = rqst->rq_iov;
2706 __le16 *copy_path;
2707 int rc;
2708
2709 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2710 (void **) &req, &total_len);
2711 if (rc)
2712 return rc;
2713
2714 iov[0].iov_base = (char *)req;
2715 /* -1 since last byte is buf[0] which is sent below (path) */
2716 iov[0].iov_len = total_len - 1;
2717
2718 if (oparms->create_options & CREATE_OPTION_READONLY)
2719 file_attributes |= ATTR_READONLY;
2720 if (oparms->create_options & CREATE_OPTION_SPECIAL)
2721 file_attributes |= ATTR_SYSTEM;
2722
2723 req->ImpersonationLevel = IL_IMPERSONATION;
2724 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2725 /* File attributes ignored on open (used in create though) */
2726 req->FileAttributes = cpu_to_le32(file_attributes);
2727 req->ShareAccess = FILE_SHARE_ALL_LE;
2728
2729 req->CreateDisposition = cpu_to_le32(oparms->disposition);
2730 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2731 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2732
2733 /* [MS-SMB2] 2.2.13 NameOffset:
2734 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2735 * the SMB2 header, the file name includes a prefix that will
2736 * be processed during DFS name normalization as specified in
2737 * section 3.3.5.9. Otherwise, the file name is relative to
2738 * the share that is identified by the TreeId in the SMB2
2739 * header.
2740 */
2741 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2742 int name_len;
2743
2744 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2745 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2746 &name_len,
2747 tcon->treeName, path);
2748 if (rc)
2749 return rc;
2750 req->NameLength = cpu_to_le16(name_len * 2);
2751 uni_path_len = copy_size;
2752 path = copy_path;
2753 } else {
2754 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2755 /* MUST set path len (NameLength) to 0 opening root of share */
2756 req->NameLength = cpu_to_le16(uni_path_len - 2);
2757 copy_size = uni_path_len;
2758 if (copy_size % 8 != 0)
2759 copy_size = roundup(copy_size, 8);
2760 copy_path = kzalloc(copy_size, GFP_KERNEL);
2761 if (!copy_path)
2762 return -ENOMEM;
2763 memcpy((char *)copy_path, (const char *)path,
2764 uni_path_len);
2765 uni_path_len = copy_size;
2766 path = copy_path;
2767 }
2768
2769 iov[1].iov_len = uni_path_len;
2770 iov[1].iov_base = path;
2771
2772 if ((!server->oplocks) || (tcon->no_lease))
2773 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2774
2775 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2776 *oplock == SMB2_OPLOCK_LEVEL_NONE)
2777 req->RequestedOplockLevel = *oplock;
2778 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2779 (oparms->create_options & CREATE_NOT_FILE))
2780 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2781 else {
2782 rc = add_lease_context(server, iov, &n_iov,
2783 oparms->fid->lease_key, oplock);
2784 if (rc)
2785 return rc;
2786 }
2787
2788 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2789 /* need to set Next field of lease context if we request it */
2790 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2791 struct create_context *ccontext =
2792 (struct create_context *)iov[n_iov-1].iov_base;
2793 ccontext->Next =
2794 cpu_to_le32(server->vals->create_lease_size);
2795 }
2796
2797 rc = add_durable_context(iov, &n_iov, oparms,
2798 tcon->use_persistent);
2799 if (rc)
2800 return rc;
2801 }
2802
2803 if (tcon->posix_extensions) {
2804 if (n_iov > 2) {
2805 struct create_context *ccontext =
2806 (struct create_context *)iov[n_iov-1].iov_base;
2807 ccontext->Next =
2808 cpu_to_le32(iov[n_iov-1].iov_len);
2809 }
2810
2811 rc = add_posix_context(iov, &n_iov, oparms->mode);
2812 if (rc)
2813 return rc;
2814 }
2815
2816 if (tcon->snapshot_time) {
2817 cifs_dbg(FYI, "adding snapshot context\n");
2818 if (n_iov > 2) {
2819 struct create_context *ccontext =
2820 (struct create_context *)iov[n_iov-1].iov_base;
2821 ccontext->Next =
2822 cpu_to_le32(iov[n_iov-1].iov_len);
2823 }
2824
2825 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2826 if (rc)
2827 return rc;
2828 }
2829
2830 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2831 bool set_mode;
2832 bool set_owner;
2833
2834 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2835 (oparms->mode != ACL_NO_MODE))
2836 set_mode = true;
2837 else {
2838 set_mode = false;
2839 oparms->mode = ACL_NO_MODE;
2840 }
2841
2842 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2843 set_owner = true;
2844 else
2845 set_owner = false;
2846
2847 if (set_owner | set_mode) {
2848 if (n_iov > 2) {
2849 struct create_context *ccontext =
2850 (struct create_context *)iov[n_iov-1].iov_base;
2851 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2852 }
2853
2854 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2855 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2856 if (rc)
2857 return rc;
2858 }
2859 }
2860
2861 if (n_iov > 2) {
2862 struct create_context *ccontext =
2863 (struct create_context *)iov[n_iov-1].iov_base;
2864 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2865 }
2866 add_query_id_context(iov, &n_iov);
2867
2868 rqst->rq_nvec = n_iov;
2869 return 0;
2870}
2871
2872/* rq_iov[0] is the request and is released by cifs_small_buf_release().
2873 * All other vectors are freed by kfree().
2874 */
2875void
2876SMB2_open_free(struct smb_rqst *rqst)
2877{
2878 int i;
2879
2880 if (rqst && rqst->rq_iov) {
2881 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2882 for (i = 1; i < rqst->rq_nvec; i++)
2883 if (rqst->rq_iov[i].iov_base != smb2_padding)
2884 kfree(rqst->rq_iov[i].iov_base);
2885 }
2886}
2887
2888int
2889SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2890 __u8 *oplock, struct smb2_file_all_info *buf,
2891 struct create_posix_rsp *posix,
2892 struct kvec *err_iov, int *buftype)
2893{
2894 struct smb_rqst rqst;
2895 struct smb2_create_rsp *rsp = NULL;
2896 struct cifs_tcon *tcon = oparms->tcon;
2897 struct cifs_ses *ses = tcon->ses;
2898 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2899 struct kvec iov[SMB2_CREATE_IOV_SIZE];
2900 struct kvec rsp_iov = {NULL, 0};
2901 int resp_buftype = CIFS_NO_BUFFER;
2902 int rc = 0;
2903 int flags = 0;
2904
2905 cifs_dbg(FYI, "create/open\n");
2906 if (!ses || !server)
2907 return -EIO;
2908
2909 if (smb3_encryption_required(tcon))
2910 flags |= CIFS_TRANSFORM_REQ;
2911
2912 memset(&rqst, 0, sizeof(struct smb_rqst));
2913 memset(&iov, 0, sizeof(iov));
2914 rqst.rq_iov = iov;
2915 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2916
2917 rc = SMB2_open_init(tcon, server,
2918 &rqst, oplock, oparms, path);
2919 if (rc)
2920 goto creat_exit;
2921
2922 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2923 oparms->create_options, oparms->desired_access);
2924
2925 rc = cifs_send_recv(xid, ses, server,
2926 &rqst, &resp_buftype, flags,
2927 &rsp_iov);
2928 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2929
2930 if (rc != 0) {
2931 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2932 if (err_iov && rsp) {
2933 *err_iov = rsp_iov;
2934 *buftype = resp_buftype;
2935 resp_buftype = CIFS_NO_BUFFER;
2936 rsp = NULL;
2937 }
2938 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2939 oparms->create_options, oparms->desired_access, rc);
2940 if (rc == -EREMCHG) {
2941 pr_warn_once("server share %s deleted\n",
2942 tcon->treeName);
2943 tcon->need_reconnect = true;
2944 }
2945 goto creat_exit;
2946 } else
2947 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2948 ses->Suid, oparms->create_options,
2949 oparms->desired_access);
2950
2951 atomic_inc(&tcon->num_remote_opens);
2952 oparms->fid->persistent_fid = rsp->PersistentFileId;
2953 oparms->fid->volatile_fid = rsp->VolatileFileId;
2954 oparms->fid->access = oparms->desired_access;
2955#ifdef CONFIG_CIFS_DEBUG2
2956 oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2957#endif /* CIFS_DEBUG2 */
2958
2959 if (buf) {
2960 buf->CreationTime = rsp->CreationTime;
2961 buf->LastAccessTime = rsp->LastAccessTime;
2962 buf->LastWriteTime = rsp->LastWriteTime;
2963 buf->ChangeTime = rsp->ChangeTime;
2964 buf->AllocationSize = rsp->AllocationSize;
2965 buf->EndOfFile = rsp->EndofFile;
2966 buf->Attributes = rsp->FileAttributes;
2967 buf->NumberOfLinks = cpu_to_le32(1);
2968 buf->DeletePending = 0;
2969 }
2970
2971
2972 smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2973 oparms->fid->lease_key, oplock, buf, posix);
2974creat_exit:
2975 SMB2_open_free(&rqst);
2976 free_rsp_buf(resp_buftype, rsp);
2977 return rc;
2978}
2979
2980int
2981SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2982 struct smb_rqst *rqst,
2983 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2984 bool is_fsctl, char *in_data, u32 indatalen,
2985 __u32 max_response_size)
2986{
2987 struct smb2_ioctl_req *req;
2988 struct kvec *iov = rqst->rq_iov;
2989 unsigned int total_len;
2990 int rc;
2991 char *in_data_buf;
2992
2993 rc = smb2_ioctl_req_init(opcode, tcon, server,
2994 (void **) &req, &total_len);
2995 if (rc)
2996 return rc;
2997
2998 if (indatalen) {
2999 /*
3000 * indatalen is usually small at a couple of bytes max, so
3001 * just allocate through generic pool
3002 */
3003 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3004 if (!in_data_buf) {
3005 cifs_small_buf_release(req);
3006 return -ENOMEM;
3007 }
3008 }
3009
3010 req->CtlCode = cpu_to_le32(opcode);
3011 req->PersistentFileId = persistent_fid;
3012 req->VolatileFileId = volatile_fid;
3013
3014 iov[0].iov_base = (char *)req;
3015 /*
3016 * If no input data, the size of ioctl struct in
3017 * protocol spec still includes a 1 byte data buffer,
3018 * but if input data passed to ioctl, we do not
3019 * want to double count this, so we do not send
3020 * the dummy one byte of data in iovec[0] if sending
3021 * input data (in iovec[1]).
3022 */
3023 if (indatalen) {
3024 req->InputCount = cpu_to_le32(indatalen);
3025 /* do not set InputOffset if no input data */
3026 req->InputOffset =
3027 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3028 rqst->rq_nvec = 2;
3029 iov[0].iov_len = total_len - 1;
3030 iov[1].iov_base = in_data_buf;
3031 iov[1].iov_len = indatalen;
3032 } else {
3033 rqst->rq_nvec = 1;
3034 iov[0].iov_len = total_len;
3035 }
3036
3037 req->OutputOffset = 0;
3038 req->OutputCount = 0; /* MBZ */
3039
3040 /*
3041 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3042 * We Could increase default MaxOutputResponse, but that could require
3043 * more credits. Windows typically sets this smaller, but for some
3044 * ioctls it may be useful to allow server to send more. No point
3045 * limiting what the server can send as long as fits in one credit
3046 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3047 * to increase this limit up in the future.
3048 * Note that for snapshot queries that servers like Azure expect that
3049 * the first query be minimal size (and just used to get the number/size
3050 * of previous versions) so response size must be specified as EXACTLY
3051 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3052 * of eight bytes. Currently that is the only case where we set max
3053 * response size smaller.
3054 */
3055 req->MaxOutputResponse = cpu_to_le32(max_response_size);
3056 req->sync_hdr.CreditCharge =
3057 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3058 SMB2_MAX_BUFFER_SIZE));
3059 if (is_fsctl)
3060 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3061 else
3062 req->Flags = 0;
3063
3064 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3065 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3066 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3067
3068 return 0;
3069}
3070
3071void
3072SMB2_ioctl_free(struct smb_rqst *rqst)
3073{
3074 int i;
3075 if (rqst && rqst->rq_iov) {
3076 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3077 for (i = 1; i < rqst->rq_nvec; i++)
3078 if (rqst->rq_iov[i].iov_base != smb2_padding)
3079 kfree(rqst->rq_iov[i].iov_base);
3080 }
3081}
3082
3083
3084/*
3085 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
3086 */
3087int
3088SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3089 u64 volatile_fid, u32 opcode, bool is_fsctl,
3090 char *in_data, u32 indatalen, u32 max_out_data_len,
3091 char **out_data, u32 *plen /* returned data len */)
3092{
3093 struct smb_rqst rqst;
3094 struct smb2_ioctl_rsp *rsp = NULL;
3095 struct cifs_ses *ses;
3096 struct TCP_Server_Info *server;
3097 struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3098 struct kvec rsp_iov = {NULL, 0};
3099 int resp_buftype = CIFS_NO_BUFFER;
3100 int rc = 0;
3101 int flags = 0;
3102
3103 cifs_dbg(FYI, "SMB2 IOCTL\n");
3104
3105 if (out_data != NULL)
3106 *out_data = NULL;
3107
3108 /* zero out returned data len, in case of error */
3109 if (plen)
3110 *plen = 0;
3111
3112 if (!tcon)
3113 return -EIO;
3114
3115 ses = tcon->ses;
3116 if (!ses)
3117 return -EIO;
3118
3119 server = cifs_pick_channel(ses);
3120 if (!server)
3121 return -EIO;
3122
3123 if (smb3_encryption_required(tcon))
3124 flags |= CIFS_TRANSFORM_REQ;
3125
3126 memset(&rqst, 0, sizeof(struct smb_rqst));
3127 memset(&iov, 0, sizeof(iov));
3128 rqst.rq_iov = iov;
3129 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3130
3131 rc = SMB2_ioctl_init(tcon, server,
3132 &rqst, persistent_fid, volatile_fid, opcode,
3133 is_fsctl, in_data, indatalen, max_out_data_len);
3134 if (rc)
3135 goto ioctl_exit;
3136
3137 rc = cifs_send_recv(xid, ses, server,
3138 &rqst, &resp_buftype, flags,
3139 &rsp_iov);
3140 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3141
3142 if (rc != 0)
3143 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3144 ses->Suid, 0, opcode, rc);
3145
3146 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3147 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3148 goto ioctl_exit;
3149 } else if (rc == -EINVAL) {
3150 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3151 (opcode != FSCTL_SRV_COPYCHUNK)) {
3152 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3153 goto ioctl_exit;
3154 }
3155 } else if (rc == -E2BIG) {
3156 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3157 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3158 goto ioctl_exit;
3159 }
3160 }
3161
3162 /* check if caller wants to look at return data or just return rc */
3163 if ((plen == NULL) || (out_data == NULL))
3164 goto ioctl_exit;
3165
3166 *plen = le32_to_cpu(rsp->OutputCount);
3167
3168 /* We check for obvious errors in the output buffer length and offset */
3169 if (*plen == 0)
3170 goto ioctl_exit; /* server returned no data */
3171 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3172 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3173 *plen = 0;
3174 rc = -EIO;
3175 goto ioctl_exit;
3176 }
3177
3178 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3179 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3180 le32_to_cpu(rsp->OutputOffset));
3181 *plen = 0;
3182 rc = -EIO;
3183 goto ioctl_exit;
3184 }
3185
3186 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3187 *plen, GFP_KERNEL);
3188 if (*out_data == NULL) {
3189 rc = -ENOMEM;
3190 goto ioctl_exit;
3191 }
3192
3193ioctl_exit:
3194 SMB2_ioctl_free(&rqst);
3195 free_rsp_buf(resp_buftype, rsp);
3196 return rc;
3197}
3198
3199/*
3200 * Individual callers to ioctl worker function follow
3201 */
3202
3203int
3204SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3205 u64 persistent_fid, u64 volatile_fid)
3206{
3207 int rc;
3208 struct compress_ioctl fsctl_input;
3209 char *ret_data = NULL;
3210
3211 fsctl_input.CompressionState =
3212 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3213
3214 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3215 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3216 (char *)&fsctl_input /* data input */,
3217 2 /* in data len */, CIFSMaxBufSize /* max out data */,
3218 &ret_data /* out data */, NULL);
3219
3220 cifs_dbg(FYI, "set compression rc %d\n", rc);
3221
3222 return rc;
3223}
3224
3225int
3226SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3227 struct smb_rqst *rqst,
3228 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3229{
3230 struct smb2_close_req *req;
3231 struct kvec *iov = rqst->rq_iov;
3232 unsigned int total_len;
3233 int rc;
3234
3235 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3236 (void **) &req, &total_len);
3237 if (rc)
3238 return rc;
3239
3240 req->PersistentFileId = persistent_fid;
3241 req->VolatileFileId = volatile_fid;
3242 if (query_attrs)
3243 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3244 else
3245 req->Flags = 0;
3246 iov[0].iov_base = (char *)req;
3247 iov[0].iov_len = total_len;
3248
3249 return 0;
3250}
3251
3252void
3253SMB2_close_free(struct smb_rqst *rqst)
3254{
3255 if (rqst && rqst->rq_iov)
3256 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3257}
3258
3259int
3260__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3261 u64 persistent_fid, u64 volatile_fid,
3262 struct smb2_file_network_open_info *pbuf)
3263{
3264 struct smb_rqst rqst;
3265 struct smb2_close_rsp *rsp = NULL;
3266 struct cifs_ses *ses = tcon->ses;
3267 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3268 struct kvec iov[1];
3269 struct kvec rsp_iov;
3270 int resp_buftype = CIFS_NO_BUFFER;
3271 int rc = 0;
3272 int flags = 0;
3273 bool query_attrs = false;
3274
3275 cifs_dbg(FYI, "Close\n");
3276
3277 if (!ses || !server)
3278 return -EIO;
3279
3280 if (smb3_encryption_required(tcon))
3281 flags |= CIFS_TRANSFORM_REQ;
3282
3283 memset(&rqst, 0, sizeof(struct smb_rqst));
3284 memset(&iov, 0, sizeof(iov));
3285 rqst.rq_iov = iov;
3286 rqst.rq_nvec = 1;
3287
3288 /* check if need to ask server to return timestamps in close response */
3289 if (pbuf)
3290 query_attrs = true;
3291
3292 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3293 rc = SMB2_close_init(tcon, server,
3294 &rqst, persistent_fid, volatile_fid,
3295 query_attrs);
3296 if (rc)
3297 goto close_exit;
3298
3299 rc = cifs_send_recv(xid, ses, server,
3300 &rqst, &resp_buftype, flags, &rsp_iov);
3301 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3302
3303 if (rc != 0) {
3304 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3305 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3306 rc);
3307 goto close_exit;
3308 } else {
3309 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3310 ses->Suid);
3311 /*
3312 * Note that have to subtract 4 since struct network_open_info
3313 * has a final 4 byte pad that close response does not have
3314 */
3315 if (pbuf)
3316 memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3317 }
3318
3319 atomic_dec(&tcon->num_remote_opens);
3320close_exit:
3321 SMB2_close_free(&rqst);
3322 free_rsp_buf(resp_buftype, rsp);
3323
3324 /* retry close in a worker thread if this one is interrupted */
3325 if (is_interrupt_error(rc)) {
3326 int tmp_rc;
3327
3328 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3329 volatile_fid);
3330 if (tmp_rc)
3331 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3332 persistent_fid, tmp_rc);
3333 }
3334 return rc;
3335}
3336
3337int
3338SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3339 u64 persistent_fid, u64 volatile_fid)
3340{
3341 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3342}
3343
3344int
3345smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3346 struct kvec *iov, unsigned int min_buf_size)
3347{
3348 unsigned int smb_len = iov->iov_len;
3349 char *end_of_smb = smb_len + (char *)iov->iov_base;
3350 char *begin_of_buf = offset + (char *)iov->iov_base;
3351 char *end_of_buf = begin_of_buf + buffer_length;
3352
3353
3354 if (buffer_length < min_buf_size) {
3355 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3356 buffer_length, min_buf_size);
3357 return -EINVAL;
3358 }
3359
3360 /* check if beyond RFC1001 maximum length */
3361 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3362 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3363 buffer_length, smb_len);
3364 return -EINVAL;
3365 }
3366
3367 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3368 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3369 return -EINVAL;
3370 }
3371
3372 return 0;
3373}
3374
3375/*
3376 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3377 * Caller must free buffer.
3378 */
3379int
3380smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3381 struct kvec *iov, unsigned int minbufsize,
3382 char *data)
3383{
3384 char *begin_of_buf = offset + (char *)iov->iov_base;
3385 int rc;
3386
3387 if (!data)
3388 return -EINVAL;
3389
3390 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3391 if (rc)
3392 return rc;
3393
3394 memcpy(data, begin_of_buf, buffer_length);
3395
3396 return 0;
3397}
3398
3399int
3400SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3401 struct smb_rqst *rqst,
3402 u64 persistent_fid, u64 volatile_fid,
3403 u8 info_class, u8 info_type, u32 additional_info,
3404 size_t output_len, size_t input_len, void *input)
3405{
3406 struct smb2_query_info_req *req;
3407 struct kvec *iov = rqst->rq_iov;
3408 unsigned int total_len;
3409 int rc;
3410
3411 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3412 (void **) &req, &total_len);
3413 if (rc)
3414 return rc;
3415
3416 req->InfoType = info_type;
3417 req->FileInfoClass = info_class;
3418 req->PersistentFileId = persistent_fid;
3419 req->VolatileFileId = volatile_fid;
3420 req->AdditionalInformation = cpu_to_le32(additional_info);
3421
3422 req->OutputBufferLength = cpu_to_le32(output_len);
3423 if (input_len) {
3424 req->InputBufferLength = cpu_to_le32(input_len);
3425 /* total_len for smb query request never close to le16 max */
3426 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3427 memcpy(req->Buffer, input, input_len);
3428 }
3429
3430 iov[0].iov_base = (char *)req;
3431 /* 1 for Buffer */
3432 iov[0].iov_len = total_len - 1 + input_len;
3433 return 0;
3434}
3435
3436void
3437SMB2_query_info_free(struct smb_rqst *rqst)
3438{
3439 if (rqst && rqst->rq_iov)
3440 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3441}
3442
3443static int
3444query_info(const unsigned int xid, struct cifs_tcon *tcon,
3445 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3446 u32 additional_info, size_t output_len, size_t min_len, void **data,
3447 u32 *dlen)
3448{
3449 struct smb_rqst rqst;
3450 struct smb2_query_info_rsp *rsp = NULL;
3451 struct kvec iov[1];
3452 struct kvec rsp_iov;
3453 int rc = 0;
3454 int resp_buftype = CIFS_NO_BUFFER;
3455 struct cifs_ses *ses = tcon->ses;
3456 struct TCP_Server_Info *server;
3457 int flags = 0;
3458 bool allocated = false;
3459
3460 cifs_dbg(FYI, "Query Info\n");
3461
3462 if (!ses)
3463 return -EIO;
3464 server = cifs_pick_channel(ses);
3465 if (!server)
3466 return -EIO;
3467
3468 if (smb3_encryption_required(tcon))
3469 flags |= CIFS_TRANSFORM_REQ;
3470
3471 memset(&rqst, 0, sizeof(struct smb_rqst));
3472 memset(&iov, 0, sizeof(iov));
3473 rqst.rq_iov = iov;
3474 rqst.rq_nvec = 1;
3475
3476 rc = SMB2_query_info_init(tcon, server,
3477 &rqst, persistent_fid, volatile_fid,
3478 info_class, info_type, additional_info,
3479 output_len, 0, NULL);
3480 if (rc)
3481 goto qinf_exit;
3482
3483 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3484 ses->Suid, info_class, (__u32)info_type);
3485
3486 rc = cifs_send_recv(xid, ses, server,
3487 &rqst, &resp_buftype, flags, &rsp_iov);
3488 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3489
3490 if (rc) {
3491 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3492 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3493 ses->Suid, info_class, (__u32)info_type, rc);
3494 goto qinf_exit;
3495 }
3496
3497 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3498 ses->Suid, info_class, (__u32)info_type);
3499
3500 if (dlen) {
3501 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3502 if (!*data) {
3503 *data = kmalloc(*dlen, GFP_KERNEL);
3504 if (!*data) {
3505 cifs_tcon_dbg(VFS,
3506 "Error %d allocating memory for acl\n",
3507 rc);
3508 *dlen = 0;
3509 rc = -ENOMEM;
3510 goto qinf_exit;
3511 }
3512 allocated = true;
3513 }
3514 }
3515
3516 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3517 le32_to_cpu(rsp->OutputBufferLength),
3518 &rsp_iov, min_len, *data);
3519 if (rc && allocated) {
3520 kfree(*data);
3521 *data = NULL;
3522 *dlen = 0;
3523 }
3524
3525qinf_exit:
3526 SMB2_query_info_free(&rqst);
3527 free_rsp_buf(resp_buftype, rsp);
3528 return rc;
3529}
3530
3531int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3532 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3533{
3534 return query_info(xid, tcon, persistent_fid, volatile_fid,
3535 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3536 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3537 sizeof(struct smb2_file_all_info), (void **)&data,
3538 NULL);
3539}
3540
3541#if 0
3542/* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3543int
3544SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3545 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3546{
3547 size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3548 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3549 *plen = 0;
3550
3551 return query_info(xid, tcon, persistent_fid, volatile_fid,
3552 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3553 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3554 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3555}
3556#endif
3557
3558int
3559SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3560 u64 persistent_fid, u64 volatile_fid,
3561 void **data, u32 *plen, u32 extra_info)
3562{
3563 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3564 extra_info;
3565 *plen = 0;
3566
3567 return query_info(xid, tcon, persistent_fid, volatile_fid,
3568 0, SMB2_O_INFO_SECURITY, additional_info,
3569 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3570}
3571
3572int
3573SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3574 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3575{
3576 return query_info(xid, tcon, persistent_fid, volatile_fid,
3577 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3578 sizeof(struct smb2_file_internal_info),
3579 sizeof(struct smb2_file_internal_info),
3580 (void **)&uniqueid, NULL);
3581}
3582
3583/*
3584 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3585 * See MS-SMB2 2.2.35 and 2.2.36
3586 */
3587
3588static int
3589SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3590 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3591 u64 persistent_fid, u64 volatile_fid,
3592 u32 completion_filter, bool watch_tree)
3593{
3594 struct smb2_change_notify_req *req;
3595 struct kvec *iov = rqst->rq_iov;
3596 unsigned int total_len;
3597 int rc;
3598
3599 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3600 (void **) &req, &total_len);
3601 if (rc)
3602 return rc;
3603
3604 req->PersistentFileId = persistent_fid;
3605 req->VolatileFileId = volatile_fid;
3606 /* See note 354 of MS-SMB2, 64K max */
3607 req->OutputBufferLength =
3608 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3609 req->CompletionFilter = cpu_to_le32(completion_filter);
3610 if (watch_tree)
3611 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3612 else
3613 req->Flags = 0;
3614
3615 iov[0].iov_base = (char *)req;
3616 iov[0].iov_len = total_len;
3617
3618 return 0;
3619}
3620
3621int
3622SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3623 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3624 u32 completion_filter)
3625{
3626 struct cifs_ses *ses = tcon->ses;
3627 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3628 struct smb_rqst rqst;
3629 struct kvec iov[1];
3630 struct kvec rsp_iov = {NULL, 0};
3631 int resp_buftype = CIFS_NO_BUFFER;
3632 int flags = 0;
3633 int rc = 0;
3634
3635 cifs_dbg(FYI, "change notify\n");
3636 if (!ses || !server)
3637 return -EIO;
3638
3639 if (smb3_encryption_required(tcon))
3640 flags |= CIFS_TRANSFORM_REQ;
3641
3642 memset(&rqst, 0, sizeof(struct smb_rqst));
3643 memset(&iov, 0, sizeof(iov));
3644 rqst.rq_iov = iov;
3645 rqst.rq_nvec = 1;
3646
3647 rc = SMB2_notify_init(xid, &rqst, tcon, server,
3648 persistent_fid, volatile_fid,
3649 completion_filter, watch_tree);
3650 if (rc)
3651 goto cnotify_exit;
3652
3653 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3654 (u8)watch_tree, completion_filter);
3655 rc = cifs_send_recv(xid, ses, server,
3656 &rqst, &resp_buftype, flags, &rsp_iov);
3657
3658 if (rc != 0) {
3659 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3660 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3661 (u8)watch_tree, completion_filter, rc);
3662 } else
3663 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3664 ses->Suid, (u8)watch_tree, completion_filter);
3665
3666 cnotify_exit:
3667 if (rqst.rq_iov)
3668 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3669 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3670 return rc;
3671}
3672
3673
3674
3675/*
3676 * This is a no-op for now. We're not really interested in the reply, but
3677 * rather in the fact that the server sent one and that server->lstrp
3678 * gets updated.
3679 *
3680 * FIXME: maybe we should consider checking that the reply matches request?
3681 */
3682static void
3683smb2_echo_callback(struct mid_q_entry *mid)
3684{
3685 struct TCP_Server_Info *server = mid->callback_data;
3686 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3687 struct cifs_credits credits = { .value = 0, .instance = 0 };
3688
3689 if (mid->mid_state == MID_RESPONSE_RECEIVED
3690 || mid->mid_state == MID_RESPONSE_MALFORMED) {
3691 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3692 credits.instance = server->reconnect_instance;
3693 }
3694
3695 DeleteMidQEntry(mid);
3696 add_credits(server, &credits, CIFS_ECHO_OP);
3697}
3698
3699void smb2_reconnect_server(struct work_struct *work)
3700{
3701 struct TCP_Server_Info *server = container_of(work,
3702 struct TCP_Server_Info, reconnect.work);
3703 struct cifs_ses *ses;
3704 struct cifs_tcon *tcon, *tcon2;
3705 struct list_head tmp_list;
3706 int tcon_exist = false;
3707 int rc;
3708 int resched = false;
3709
3710
3711 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3712 mutex_lock(&server->reconnect_mutex);
3713
3714 INIT_LIST_HEAD(&tmp_list);
3715 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3716
3717 spin_lock(&cifs_tcp_ses_lock);
3718 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3719 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3720 if (tcon->need_reconnect || tcon->need_reopen_files) {
3721 tcon->tc_count++;
3722 list_add_tail(&tcon->rlist, &tmp_list);
3723 tcon_exist = true;
3724 }
3725 }
3726 /*
3727 * IPC has the same lifetime as its session and uses its
3728 * refcount.
3729 */
3730 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3731 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3732 tcon_exist = true;
3733 ses->ses_count++;
3734 }
3735 }
3736 /*
3737 * Get the reference to server struct to be sure that the last call of
3738 * cifs_put_tcon() in the loop below won't release the server pointer.
3739 */
3740 if (tcon_exist)
3741 server->srv_count++;
3742
3743 spin_unlock(&cifs_tcp_ses_lock);
3744
3745 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3746 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3747 if (!rc)
3748 cifs_reopen_persistent_handles(tcon);
3749 else
3750 resched = true;
3751 list_del_init(&tcon->rlist);
3752 if (tcon->ipc)
3753 cifs_put_smb_ses(tcon->ses);
3754 else
3755 cifs_put_tcon(tcon);
3756 }
3757
3758 cifs_dbg(FYI, "Reconnecting tcons finished\n");
3759 if (resched)
3760 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3761 mutex_unlock(&server->reconnect_mutex);
3762
3763 /* now we can safely release srv struct */
3764 if (tcon_exist)
3765 cifs_put_tcp_session(server, 1);
3766}
3767
3768int
3769SMB2_echo(struct TCP_Server_Info *server)
3770{
3771 struct smb2_echo_req *req;
3772 int rc = 0;
3773 struct kvec iov[1];
3774 struct smb_rqst rqst = { .rq_iov = iov,
3775 .rq_nvec = 1 };
3776 unsigned int total_len;
3777
3778 cifs_dbg(FYI, "In echo request\n");
3779
3780 if (server->tcpStatus == CifsNeedNegotiate) {
3781 /* No need to send echo on newly established connections */
3782 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3783 return rc;
3784 }
3785
3786 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3787 (void **)&req, &total_len);
3788 if (rc)
3789 return rc;
3790
3791 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3792
3793 iov[0].iov_len = total_len;
3794 iov[0].iov_base = (char *)req;
3795
3796 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3797 server, CIFS_ECHO_OP, NULL);
3798 if (rc)
3799 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3800
3801 cifs_small_buf_release(req);
3802 return rc;
3803}
3804
3805void
3806SMB2_flush_free(struct smb_rqst *rqst)
3807{
3808 if (rqst && rqst->rq_iov)
3809 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3810}
3811
3812int
3813SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3814 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3815 u64 persistent_fid, u64 volatile_fid)
3816{
3817 struct smb2_flush_req *req;
3818 struct kvec *iov = rqst->rq_iov;
3819 unsigned int total_len;
3820 int rc;
3821
3822 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3823 (void **) &req, &total_len);
3824 if (rc)
3825 return rc;
3826
3827 req->PersistentFileId = persistent_fid;
3828 req->VolatileFileId = volatile_fid;
3829
3830 iov[0].iov_base = (char *)req;
3831 iov[0].iov_len = total_len;
3832
3833 return 0;
3834}
3835
3836int
3837SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3838 u64 volatile_fid)
3839{
3840 struct cifs_ses *ses = tcon->ses;
3841 struct smb_rqst rqst;
3842 struct kvec iov[1];
3843 struct kvec rsp_iov = {NULL, 0};
3844 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3845 int resp_buftype = CIFS_NO_BUFFER;
3846 int flags = 0;
3847 int rc = 0;
3848
3849 cifs_dbg(FYI, "flush\n");
3850 if (!ses || !(ses->server))
3851 return -EIO;
3852
3853 if (smb3_encryption_required(tcon))
3854 flags |= CIFS_TRANSFORM_REQ;
3855
3856 memset(&rqst, 0, sizeof(struct smb_rqst));
3857 memset(&iov, 0, sizeof(iov));
3858 rqst.rq_iov = iov;
3859 rqst.rq_nvec = 1;
3860
3861 rc = SMB2_flush_init(xid, &rqst, tcon, server,
3862 persistent_fid, volatile_fid);
3863 if (rc)
3864 goto flush_exit;
3865
3866 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3867 rc = cifs_send_recv(xid, ses, server,
3868 &rqst, &resp_buftype, flags, &rsp_iov);
3869
3870 if (rc != 0) {
3871 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3872 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3873 rc);
3874 } else
3875 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3876 ses->Suid);
3877
3878 flush_exit:
3879 SMB2_flush_free(&rqst);
3880 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3881 return rc;
3882}
3883
3884/*
3885 * To form a chain of read requests, any read requests after the first should
3886 * have the end_of_chain boolean set to true.
3887 */
3888static int
3889smb2_new_read_req(void **buf, unsigned int *total_len,
3890 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3891 unsigned int remaining_bytes, int request_type)
3892{
3893 int rc = -EACCES;
3894 struct smb2_read_plain_req *req = NULL;
3895 struct smb2_sync_hdr *shdr;
3896 struct TCP_Server_Info *server = io_parms->server;
3897
3898 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3899 (void **) &req, total_len);
3900 if (rc)
3901 return rc;
3902
3903 if (server == NULL)
3904 return -ECONNABORTED;
3905
3906 shdr = &req->sync_hdr;
3907 shdr->ProcessId = cpu_to_le32(io_parms->pid);
3908
3909 req->PersistentFileId = io_parms->persistent_fid;
3910 req->VolatileFileId = io_parms->volatile_fid;
3911 req->ReadChannelInfoOffset = 0; /* reserved */
3912 req->ReadChannelInfoLength = 0; /* reserved */
3913 req->Channel = 0; /* reserved */
3914 req->MinimumCount = 0;
3915 req->Length = cpu_to_le32(io_parms->length);
3916 req->Offset = cpu_to_le64(io_parms->offset);
3917
3918 trace_smb3_read_enter(0 /* xid */,
3919 io_parms->persistent_fid,
3920 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3921 io_parms->offset, io_parms->length);
3922#ifdef CONFIG_CIFS_SMB_DIRECT
3923 /*
3924 * If we want to do a RDMA write, fill in and append
3925 * smbd_buffer_descriptor_v1 to the end of read request
3926 */
3927 if (server->rdma && rdata && !server->sign &&
3928 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3929
3930 struct smbd_buffer_descriptor_v1 *v1;
3931 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3932
3933 rdata->mr = smbd_register_mr(
3934 server->smbd_conn, rdata->pages,
3935 rdata->nr_pages, rdata->page_offset,
3936 rdata->tailsz, true, need_invalidate);
3937 if (!rdata->mr)
3938 return -EAGAIN;
3939
3940 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3941 if (need_invalidate)
3942 req->Channel = SMB2_CHANNEL_RDMA_V1;
3943 req->ReadChannelInfoOffset =
3944 cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3945 req->ReadChannelInfoLength =
3946 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3947 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3948 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3949 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3950 v1->length = cpu_to_le32(rdata->mr->mr->length);
3951
3952 *total_len += sizeof(*v1) - 1;
3953 }
3954#endif
3955 if (request_type & CHAINED_REQUEST) {
3956 if (!(request_type & END_OF_CHAIN)) {
3957 /* next 8-byte aligned request */
3958 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3959 shdr->NextCommand = cpu_to_le32(*total_len);
3960 } else /* END_OF_CHAIN */
3961 shdr->NextCommand = 0;
3962 if (request_type & RELATED_REQUEST) {
3963 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3964 /*
3965 * Related requests use info from previous read request
3966 * in chain.
3967 */
3968 shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3969 shdr->TreeId = 0xFFFFFFFF;
3970 req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3971 req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3972 }
3973 }
3974 if (remaining_bytes > io_parms->length)
3975 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3976 else
3977 req->RemainingBytes = 0;
3978
3979 *buf = req;
3980 return rc;
3981}
3982
3983static void
3984smb2_readv_callback(struct mid_q_entry *mid)
3985{
3986 struct cifs_readdata *rdata = mid->callback_data;
3987 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3988 struct TCP_Server_Info *server = rdata->server;
3989 struct smb2_sync_hdr *shdr =
3990 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3991 struct cifs_credits credits = { .value = 0, .instance = 0 };
3992 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3993 .rq_nvec = 1,
3994 .rq_pages = rdata->pages,
3995 .rq_offset = rdata->page_offset,
3996 .rq_npages = rdata->nr_pages,
3997 .rq_pagesz = rdata->pagesz,
3998 .rq_tailsz = rdata->tailsz };
3999
4000 WARN_ONCE(rdata->server != mid->server,
4001 "rdata server %p != mid server %p",
4002 rdata->server, mid->server);
4003
4004 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4005 __func__, mid->mid, mid->mid_state, rdata->result,
4006 rdata->bytes);
4007
4008 switch (mid->mid_state) {
4009 case MID_RESPONSE_RECEIVED:
4010 credits.value = le16_to_cpu(shdr->CreditRequest);
4011 credits.instance = server->reconnect_instance;
4012 /* result already set, check signature */
4013 if (server->sign && !mid->decrypted) {
4014 int rc;
4015
4016 rc = smb2_verify_signature(&rqst, server);
4017 if (rc)
4018 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4019 rc);
4020 }
4021 /* FIXME: should this be counted toward the initiating task? */
4022 task_io_account_read(rdata->got_bytes);
4023 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4024 break;
4025 case MID_REQUEST_SUBMITTED:
4026 case MID_RETRY_NEEDED:
4027 rdata->result = -EAGAIN;
4028 if (server->sign && rdata->got_bytes)
4029 /* reset bytes number since we can not check a sign */
4030 rdata->got_bytes = 0;
4031 /* FIXME: should this be counted toward the initiating task? */
4032 task_io_account_read(rdata->got_bytes);
4033 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4034 break;
4035 case MID_RESPONSE_MALFORMED:
4036 credits.value = le16_to_cpu(shdr->CreditRequest);
4037 credits.instance = server->reconnect_instance;
4038 fallthrough;
4039 default:
4040 rdata->result = -EIO;
4041 }
4042#ifdef CONFIG_CIFS_SMB_DIRECT
4043 /*
4044 * If this rdata has a memmory registered, the MR can be freed
4045 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4046 * because they have limited number and are used for future I/Os
4047 */
4048 if (rdata->mr) {
4049 smbd_deregister_mr(rdata->mr);
4050 rdata->mr = NULL;
4051 }
4052#endif
4053 if (rdata->result && rdata->result != -ENODATA) {
4054 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4055 trace_smb3_read_err(0 /* xid */,
4056 rdata->cfile->fid.persistent_fid,
4057 tcon->tid, tcon->ses->Suid, rdata->offset,
4058 rdata->bytes, rdata->result);
4059 } else
4060 trace_smb3_read_done(0 /* xid */,
4061 rdata->cfile->fid.persistent_fid,
4062 tcon->tid, tcon->ses->Suid,
4063 rdata->offset, rdata->got_bytes);
4064
4065 queue_work(cifsiod_wq, &rdata->work);
4066 DeleteMidQEntry(mid);
4067 add_credits(server, &credits, 0);
4068}
4069
4070/* smb2_async_readv - send an async read, and set up mid to handle result */
4071int
4072smb2_async_readv(struct cifs_readdata *rdata)
4073{
4074 int rc, flags = 0;
4075 char *buf;
4076 struct smb2_sync_hdr *shdr;
4077 struct cifs_io_parms io_parms;
4078 struct smb_rqst rqst = { .rq_iov = rdata->iov,
4079 .rq_nvec = 1 };
4080 struct TCP_Server_Info *server;
4081 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4082 unsigned int total_len;
4083
4084 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4085 __func__, rdata->offset, rdata->bytes);
4086
4087 if (!rdata->server)
4088 rdata->server = cifs_pick_channel(tcon->ses);
4089
4090 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4091 io_parms.server = server = rdata->server;
4092 io_parms.offset = rdata->offset;
4093 io_parms.length = rdata->bytes;
4094 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4095 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4096 io_parms.pid = rdata->pid;
4097
4098 rc = smb2_new_read_req(
4099 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4100 if (rc)
4101 return rc;
4102
4103 if (smb3_encryption_required(io_parms.tcon))
4104 flags |= CIFS_TRANSFORM_REQ;
4105
4106 rdata->iov[0].iov_base = buf;
4107 rdata->iov[0].iov_len = total_len;
4108
4109 shdr = (struct smb2_sync_hdr *)buf;
4110
4111 if (rdata->credits.value > 0) {
4112 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4113 SMB2_MAX_BUFFER_SIZE));
4114 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4115
4116 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4117 if (rc)
4118 goto async_readv_out;
4119
4120 flags |= CIFS_HAS_CREDITS;
4121 }
4122
4123 kref_get(&rdata->refcount);
4124 rc = cifs_call_async(server, &rqst,
4125 cifs_readv_receive, smb2_readv_callback,
4126 smb3_handle_read_data, rdata, flags,
4127 &rdata->credits);
4128 if (rc) {
4129 kref_put(&rdata->refcount, cifs_readdata_release);
4130 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4131 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4132 io_parms.tcon->tid,
4133 io_parms.tcon->ses->Suid,
4134 io_parms.offset, io_parms.length, rc);
4135 }
4136
4137async_readv_out:
4138 cifs_small_buf_release(buf);
4139 return rc;
4140}
4141
4142int
4143SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4144 unsigned int *nbytes, char **buf, int *buf_type)
4145{
4146 struct smb_rqst rqst;
4147 int resp_buftype, rc;
4148 struct smb2_read_plain_req *req = NULL;
4149 struct smb2_read_rsp *rsp = NULL;
4150 struct kvec iov[1];
4151 struct kvec rsp_iov;
4152 unsigned int total_len;
4153 int flags = CIFS_LOG_ERROR;
4154 struct cifs_ses *ses = io_parms->tcon->ses;
4155
4156 if (!io_parms->server)
4157 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4158
4159 *nbytes = 0;
4160 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4161 if (rc)
4162 return rc;
4163
4164 if (smb3_encryption_required(io_parms->tcon))
4165 flags |= CIFS_TRANSFORM_REQ;
4166
4167 iov[0].iov_base = (char *)req;
4168 iov[0].iov_len = total_len;
4169
4170 memset(&rqst, 0, sizeof(struct smb_rqst));
4171 rqst.rq_iov = iov;
4172 rqst.rq_nvec = 1;
4173
4174 rc = cifs_send_recv(xid, ses, io_parms->server,
4175 &rqst, &resp_buftype, flags, &rsp_iov);
4176 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4177
4178 if (rc) {
4179 if (rc != -ENODATA) {
4180 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4181 cifs_dbg(VFS, "Send error in read = %d\n", rc);
4182 trace_smb3_read_err(xid, req->PersistentFileId,
4183 io_parms->tcon->tid, ses->Suid,
4184 io_parms->offset, io_parms->length,
4185 rc);
4186 } else
4187 trace_smb3_read_done(xid, req->PersistentFileId,
4188 io_parms->tcon->tid, ses->Suid,
4189 io_parms->offset, 0);
4190 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4191 cifs_small_buf_release(req);
4192 return rc == -ENODATA ? 0 : rc;
4193 } else
4194 trace_smb3_read_done(xid, req->PersistentFileId,
4195 io_parms->tcon->tid, ses->Suid,
4196 io_parms->offset, io_parms->length);
4197
4198 cifs_small_buf_release(req);
4199
4200 *nbytes = le32_to_cpu(rsp->DataLength);
4201 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4202 (*nbytes > io_parms->length)) {
4203 cifs_dbg(FYI, "bad length %d for count %d\n",
4204 *nbytes, io_parms->length);
4205 rc = -EIO;
4206 *nbytes = 0;
4207 }
4208
4209 if (*buf) {
4210 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4211 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4212 } else if (resp_buftype != CIFS_NO_BUFFER) {
4213 *buf = rsp_iov.iov_base;
4214 if (resp_buftype == CIFS_SMALL_BUFFER)
4215 *buf_type = CIFS_SMALL_BUFFER;
4216 else if (resp_buftype == CIFS_LARGE_BUFFER)
4217 *buf_type = CIFS_LARGE_BUFFER;
4218 }
4219 return rc;
4220}
4221
4222/*
4223 * Check the mid_state and signature on received buffer (if any), and queue the
4224 * workqueue completion task.
4225 */
4226static void
4227smb2_writev_callback(struct mid_q_entry *mid)
4228{
4229 struct cifs_writedata *wdata = mid->callback_data;
4230 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4231 struct TCP_Server_Info *server = wdata->server;
4232 unsigned int written;
4233 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4234 struct cifs_credits credits = { .value = 0, .instance = 0 };
4235
4236 WARN_ONCE(wdata->server != mid->server,
4237 "wdata server %p != mid server %p",
4238 wdata->server, mid->server);
4239
4240 switch (mid->mid_state) {
4241 case MID_RESPONSE_RECEIVED:
4242 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4243 credits.instance = server->reconnect_instance;
4244 wdata->result = smb2_check_receive(mid, server, 0);
4245 if (wdata->result != 0)
4246 break;
4247
4248 written = le32_to_cpu(rsp->DataLength);
4249 /*
4250 * Mask off high 16 bits when bytes written as returned
4251 * by the server is greater than bytes requested by the
4252 * client. OS/2 servers are known to set incorrect
4253 * CountHigh values.
4254 */
4255 if (written > wdata->bytes)
4256 written &= 0xFFFF;
4257
4258 if (written < wdata->bytes)
4259 wdata->result = -ENOSPC;
4260 else
4261 wdata->bytes = written;
4262 break;
4263 case MID_REQUEST_SUBMITTED:
4264 case MID_RETRY_NEEDED:
4265 wdata->result = -EAGAIN;
4266 break;
4267 case MID_RESPONSE_MALFORMED:
4268 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4269 credits.instance = server->reconnect_instance;
4270 fallthrough;
4271 default:
4272 wdata->result = -EIO;
4273 break;
4274 }
4275#ifdef CONFIG_CIFS_SMB_DIRECT
4276 /*
4277 * If this wdata has a memory registered, the MR can be freed
4278 * The number of MRs available is limited, it's important to recover
4279 * used MR as soon as I/O is finished. Hold MR longer in the later
4280 * I/O process can possibly result in I/O deadlock due to lack of MR
4281 * to send request on I/O retry
4282 */
4283 if (wdata->mr) {
4284 smbd_deregister_mr(wdata->mr);
4285 wdata->mr = NULL;
4286 }
4287#endif
4288 if (wdata->result) {
4289 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4290 trace_smb3_write_err(0 /* no xid */,
4291 wdata->cfile->fid.persistent_fid,
4292 tcon->tid, tcon->ses->Suid, wdata->offset,
4293 wdata->bytes, wdata->result);
4294 if (wdata->result == -ENOSPC)
4295 pr_warn_once("Out of space writing to %s\n",
4296 tcon->treeName);
4297 } else
4298 trace_smb3_write_done(0 /* no xid */,
4299 wdata->cfile->fid.persistent_fid,
4300 tcon->tid, tcon->ses->Suid,
4301 wdata->offset, wdata->bytes);
4302
4303 queue_work(cifsiod_wq, &wdata->work);
4304 DeleteMidQEntry(mid);
4305 add_credits(server, &credits, 0);
4306}
4307
4308/* smb2_async_writev - send an async write, and set up mid to handle result */
4309int
4310smb2_async_writev(struct cifs_writedata *wdata,
4311 void (*release)(struct kref *kref))
4312{
4313 int rc = -EACCES, flags = 0;
4314 struct smb2_write_req *req = NULL;
4315 struct smb2_sync_hdr *shdr;
4316 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4317 struct TCP_Server_Info *server = wdata->server;
4318 struct kvec iov[1];
4319 struct smb_rqst rqst = { };
4320 unsigned int total_len;
4321
4322 if (!wdata->server)
4323 server = wdata->server = cifs_pick_channel(tcon->ses);
4324
4325 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4326 (void **) &req, &total_len);
4327 if (rc)
4328 return rc;
4329
4330 if (smb3_encryption_required(tcon))
4331 flags |= CIFS_TRANSFORM_REQ;
4332
4333 shdr = (struct smb2_sync_hdr *)req;
4334 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4335
4336 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4337 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4338 req->WriteChannelInfoOffset = 0;
4339 req->WriteChannelInfoLength = 0;
4340 req->Channel = 0;
4341 req->Offset = cpu_to_le64(wdata->offset);
4342 req->DataOffset = cpu_to_le16(
4343 offsetof(struct smb2_write_req, Buffer));
4344 req->RemainingBytes = 0;
4345
4346 trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4347 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4348#ifdef CONFIG_CIFS_SMB_DIRECT
4349 /*
4350 * If we want to do a server RDMA read, fill in and append
4351 * smbd_buffer_descriptor_v1 to the end of write request
4352 */
4353 if (server->rdma && !server->sign && wdata->bytes >=
4354 server->smbd_conn->rdma_readwrite_threshold) {
4355
4356 struct smbd_buffer_descriptor_v1 *v1;
4357 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4358
4359 wdata->mr = smbd_register_mr(
4360 server->smbd_conn, wdata->pages,
4361 wdata->nr_pages, wdata->page_offset,
4362 wdata->tailsz, false, need_invalidate);
4363 if (!wdata->mr) {
4364 rc = -EAGAIN;
4365 goto async_writev_out;
4366 }
4367 req->Length = 0;
4368 req->DataOffset = 0;
4369 if (wdata->nr_pages > 1)
4370 req->RemainingBytes =
4371 cpu_to_le32(
4372 (wdata->nr_pages - 1) * wdata->pagesz -
4373 wdata->page_offset + wdata->tailsz
4374 );
4375 else
4376 req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4377 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4378 if (need_invalidate)
4379 req->Channel = SMB2_CHANNEL_RDMA_V1;
4380 req->WriteChannelInfoOffset =
4381 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4382 req->WriteChannelInfoLength =
4383 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4384 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4385 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4386 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4387 v1->length = cpu_to_le32(wdata->mr->mr->length);
4388 }
4389#endif
4390 iov[0].iov_len = total_len - 1;
4391 iov[0].iov_base = (char *)req;
4392
4393 rqst.rq_iov = iov;
4394 rqst.rq_nvec = 1;
4395 rqst.rq_pages = wdata->pages;
4396 rqst.rq_offset = wdata->page_offset;
4397 rqst.rq_npages = wdata->nr_pages;
4398 rqst.rq_pagesz = wdata->pagesz;
4399 rqst.rq_tailsz = wdata->tailsz;
4400#ifdef CONFIG_CIFS_SMB_DIRECT
4401 if (wdata->mr) {
4402 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4403 rqst.rq_npages = 0;
4404 }
4405#endif
4406 cifs_dbg(FYI, "async write at %llu %u bytes\n",
4407 wdata->offset, wdata->bytes);
4408
4409#ifdef CONFIG_CIFS_SMB_DIRECT
4410 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4411 if (!wdata->mr)
4412 req->Length = cpu_to_le32(wdata->bytes);
4413#else
4414 req->Length = cpu_to_le32(wdata->bytes);
4415#endif
4416
4417 if (wdata->credits.value > 0) {
4418 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4419 SMB2_MAX_BUFFER_SIZE));
4420 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4421
4422 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4423 if (rc)
4424 goto async_writev_out;
4425
4426 flags |= CIFS_HAS_CREDITS;
4427 }
4428
4429 kref_get(&wdata->refcount);
4430 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4431 wdata, flags, &wdata->credits);
4432
4433 if (rc) {
4434 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4435 tcon->tid, tcon->ses->Suid, wdata->offset,
4436 wdata->bytes, rc);
4437 kref_put(&wdata->refcount, release);
4438 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4439 }
4440
4441async_writev_out:
4442 cifs_small_buf_release(req);
4443 return rc;
4444}
4445
4446/*
4447 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4448 * The length field from io_parms must be at least 1 and indicates a number of
4449 * elements with data to write that begins with position 1 in iov array. All
4450 * data length is specified by count.
4451 */
4452int
4453SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4454 unsigned int *nbytes, struct kvec *iov, int n_vec)
4455{
4456 struct smb_rqst rqst;
4457 int rc = 0;
4458 struct smb2_write_req *req = NULL;
4459 struct smb2_write_rsp *rsp = NULL;
4460 int resp_buftype;
4461 struct kvec rsp_iov;
4462 int flags = 0;
4463 unsigned int total_len;
4464 struct TCP_Server_Info *server;
4465
4466 *nbytes = 0;
4467
4468 if (n_vec < 1)
4469 return rc;
4470
4471 if (!io_parms->server)
4472 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4473 server = io_parms->server;
4474 if (server == NULL)
4475 return -ECONNABORTED;
4476
4477 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4478 (void **) &req, &total_len);
4479 if (rc)
4480 return rc;
4481
4482 if (smb3_encryption_required(io_parms->tcon))
4483 flags |= CIFS_TRANSFORM_REQ;
4484
4485 req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4486
4487 req->PersistentFileId = io_parms->persistent_fid;
4488 req->VolatileFileId = io_parms->volatile_fid;
4489 req->WriteChannelInfoOffset = 0;
4490 req->WriteChannelInfoLength = 0;
4491 req->Channel = 0;
4492 req->Length = cpu_to_le32(io_parms->length);
4493 req->Offset = cpu_to_le64(io_parms->offset);
4494 req->DataOffset = cpu_to_le16(
4495 offsetof(struct smb2_write_req, Buffer));
4496 req->RemainingBytes = 0;
4497
4498 trace_smb3_write_enter(xid, io_parms->persistent_fid,
4499 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4500 io_parms->offset, io_parms->length);
4501
4502 iov[0].iov_base = (char *)req;
4503 /* 1 for Buffer */
4504 iov[0].iov_len = total_len - 1;
4505
4506 memset(&rqst, 0, sizeof(struct smb_rqst));
4507 rqst.rq_iov = iov;
4508 rqst.rq_nvec = n_vec + 1;
4509
4510 rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4511 &rqst,
4512 &resp_buftype, flags, &rsp_iov);
4513 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4514
4515 if (rc) {
4516 trace_smb3_write_err(xid, req->PersistentFileId,
4517 io_parms->tcon->tid,
4518 io_parms->tcon->ses->Suid,
4519 io_parms->offset, io_parms->length, rc);
4520 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4521 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4522 } else {
4523 *nbytes = le32_to_cpu(rsp->DataLength);
4524 trace_smb3_write_done(xid, req->PersistentFileId,
4525 io_parms->tcon->tid,
4526 io_parms->tcon->ses->Suid,
4527 io_parms->offset, *nbytes);
4528 }
4529
4530 cifs_small_buf_release(req);
4531 free_rsp_buf(resp_buftype, rsp);
4532 return rc;
4533}
4534
4535int posix_info_sid_size(const void *beg, const void *end)
4536{
4537 size_t subauth;
4538 int total;
4539
4540 if (beg + 1 > end)
4541 return -1;
4542
4543 subauth = *(u8 *)(beg+1);
4544 if (subauth < 1 || subauth > 15)
4545 return -1;
4546
4547 total = 1 + 1 + 6 + 4*subauth;
4548 if (beg + total > end)
4549 return -1;
4550
4551 return total;
4552}
4553
4554int posix_info_parse(const void *beg, const void *end,
4555 struct smb2_posix_info_parsed *out)
4556
4557{
4558 int total_len = 0;
4559 int owner_len, group_len;
4560 int name_len;
4561 const void *owner_sid;
4562 const void *group_sid;
4563 const void *name;
4564
4565 /* if no end bound given, assume payload to be correct */
4566 if (!end) {
4567 const struct smb2_posix_info *p = beg;
4568
4569 end = beg + le32_to_cpu(p->NextEntryOffset);
4570 /* last element will have a 0 offset, pick a sensible bound */
4571 if (end == beg)
4572 end += 0xFFFF;
4573 }
4574
4575 /* check base buf */
4576 if (beg + sizeof(struct smb2_posix_info) > end)
4577 return -1;
4578 total_len = sizeof(struct smb2_posix_info);
4579
4580 /* check owner sid */
4581 owner_sid = beg + total_len;
4582 owner_len = posix_info_sid_size(owner_sid, end);
4583 if (owner_len < 0)
4584 return -1;
4585 total_len += owner_len;
4586
4587 /* check group sid */
4588 group_sid = beg + total_len;
4589 group_len = posix_info_sid_size(group_sid, end);
4590 if (group_len < 0)
4591 return -1;
4592 total_len += group_len;
4593
4594 /* check name len */
4595 if (beg + total_len + 4 > end)
4596 return -1;
4597 name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4598 if (name_len < 1 || name_len > 0xFFFF)
4599 return -1;
4600 total_len += 4;
4601
4602 /* check name */
4603 name = beg + total_len;
4604 if (name + name_len > end)
4605 return -1;
4606 total_len += name_len;
4607
4608 if (out) {
4609 out->base = beg;
4610 out->size = total_len;
4611 out->name_len = name_len;
4612 out->name = name;
4613 memcpy(&out->owner, owner_sid, owner_len);
4614 memcpy(&out->group, group_sid, group_len);
4615 }
4616 return total_len;
4617}
4618
4619static int posix_info_extra_size(const void *beg, const void *end)
4620{
4621 int len = posix_info_parse(beg, end, NULL);
4622
4623 if (len < 0)
4624 return -1;
4625 return len - sizeof(struct smb2_posix_info);
4626}
4627
4628static unsigned int
4629num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4630 size_t size)
4631{
4632 int len;
4633 unsigned int entrycount = 0;
4634 unsigned int next_offset = 0;
4635 char *entryptr;
4636 FILE_DIRECTORY_INFO *dir_info;
4637
4638 if (bufstart == NULL)
4639 return 0;
4640
4641 entryptr = bufstart;
4642
4643 while (1) {
4644 if (entryptr + next_offset < entryptr ||
4645 entryptr + next_offset > end_of_buf ||
4646 entryptr + next_offset + size > end_of_buf) {
4647 cifs_dbg(VFS, "malformed search entry would overflow\n");
4648 break;
4649 }
4650
4651 entryptr = entryptr + next_offset;
4652 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4653
4654 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4655 len = posix_info_extra_size(entryptr, end_of_buf);
4656 else
4657 len = le32_to_cpu(dir_info->FileNameLength);
4658
4659 if (len < 0 ||
4660 entryptr + len < entryptr ||
4661 entryptr + len > end_of_buf ||
4662 entryptr + len + size > end_of_buf) {
4663 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4664 end_of_buf);
4665 break;
4666 }
4667
4668 *lastentry = entryptr;
4669 entrycount++;
4670
4671 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4672 if (!next_offset)
4673 break;
4674 }
4675
4676 return entrycount;
4677}
4678
4679/*
4680 * Readdir/FindFirst
4681 */
4682int SMB2_query_directory_init(const unsigned int xid,
4683 struct cifs_tcon *tcon,
4684 struct TCP_Server_Info *server,
4685 struct smb_rqst *rqst,
4686 u64 persistent_fid, u64 volatile_fid,
4687 int index, int info_level)
4688{
4689 struct smb2_query_directory_req *req;
4690 unsigned char *bufptr;
4691 __le16 asteriks = cpu_to_le16('*');
4692 unsigned int output_size = CIFSMaxBufSize -
4693 MAX_SMB2_CREATE_RESPONSE_SIZE -
4694 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4695 unsigned int total_len;
4696 struct kvec *iov = rqst->rq_iov;
4697 int len, rc;
4698
4699 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4700 (void **) &req, &total_len);
4701 if (rc)
4702 return rc;
4703
4704 switch (info_level) {
4705 case SMB_FIND_FILE_DIRECTORY_INFO:
4706 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4707 break;
4708 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4709 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4710 break;
4711 case SMB_FIND_FILE_POSIX_INFO:
4712 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4713 break;
4714 default:
4715 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4716 info_level);
4717 return -EINVAL;
4718 }
4719
4720 req->FileIndex = cpu_to_le32(index);
4721 req->PersistentFileId = persistent_fid;
4722 req->VolatileFileId = volatile_fid;
4723
4724 len = 0x2;
4725 bufptr = req->Buffer;
4726 memcpy(bufptr, &asteriks, len);
4727
4728 req->FileNameOffset =
4729 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4730 req->FileNameLength = cpu_to_le16(len);
4731 /*
4732 * BB could be 30 bytes or so longer if we used SMB2 specific
4733 * buffer lengths, but this is safe and close enough.
4734 */
4735 output_size = min_t(unsigned int, output_size, server->maxBuf);
4736 output_size = min_t(unsigned int, output_size, 2 << 15);
4737 req->OutputBufferLength = cpu_to_le32(output_size);
4738
4739 iov[0].iov_base = (char *)req;
4740 /* 1 for Buffer */
4741 iov[0].iov_len = total_len - 1;
4742
4743 iov[1].iov_base = (char *)(req->Buffer);
4744 iov[1].iov_len = len;
4745
4746 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4747 tcon->ses->Suid, index, output_size);
4748
4749 return 0;
4750}
4751
4752void SMB2_query_directory_free(struct smb_rqst *rqst)
4753{
4754 if (rqst && rqst->rq_iov) {
4755 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4756 }
4757}
4758
4759int
4760smb2_parse_query_directory(struct cifs_tcon *tcon,
4761 struct kvec *rsp_iov,
4762 int resp_buftype,
4763 struct cifs_search_info *srch_inf)
4764{
4765 struct smb2_query_directory_rsp *rsp;
4766 size_t info_buf_size;
4767 char *end_of_smb;
4768 int rc;
4769
4770 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4771
4772 switch (srch_inf->info_level) {
4773 case SMB_FIND_FILE_DIRECTORY_INFO:
4774 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4775 break;
4776 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4777 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4778 break;
4779 case SMB_FIND_FILE_POSIX_INFO:
4780 /* note that posix payload are variable size */
4781 info_buf_size = sizeof(struct smb2_posix_info);
4782 break;
4783 default:
4784 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4785 srch_inf->info_level);
4786 return -EINVAL;
4787 }
4788
4789 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4790 le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4791 info_buf_size);
4792 if (rc) {
4793 cifs_tcon_dbg(VFS, "bad info payload");
4794 return rc;
4795 }
4796
4797 srch_inf->unicode = true;
4798
4799 if (srch_inf->ntwrk_buf_start) {
4800 if (srch_inf->smallBuf)
4801 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4802 else
4803 cifs_buf_release(srch_inf->ntwrk_buf_start);
4804 }
4805 srch_inf->ntwrk_buf_start = (char *)rsp;
4806 srch_inf->srch_entries_start = srch_inf->last_entry =
4807 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4808 end_of_smb = rsp_iov->iov_len + (char *)rsp;
4809
4810 srch_inf->entries_in_buffer = num_entries(
4811 srch_inf->info_level,
4812 srch_inf->srch_entries_start,
4813 end_of_smb,
4814 &srch_inf->last_entry,
4815 info_buf_size);
4816
4817 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4818 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4819 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4820 srch_inf->srch_entries_start, srch_inf->last_entry);
4821 if (resp_buftype == CIFS_LARGE_BUFFER)
4822 srch_inf->smallBuf = false;
4823 else if (resp_buftype == CIFS_SMALL_BUFFER)
4824 srch_inf->smallBuf = true;
4825 else
4826 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4827
4828 return 0;
4829}
4830
4831int
4832SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4833 u64 persistent_fid, u64 volatile_fid, int index,
4834 struct cifs_search_info *srch_inf)
4835{
4836 struct smb_rqst rqst;
4837 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4838 struct smb2_query_directory_rsp *rsp = NULL;
4839 int resp_buftype = CIFS_NO_BUFFER;
4840 struct kvec rsp_iov;
4841 int rc = 0;
4842 struct cifs_ses *ses = tcon->ses;
4843 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4844 int flags = 0;
4845
4846 if (!ses || !(ses->server))
4847 return -EIO;
4848
4849 if (smb3_encryption_required(tcon))
4850 flags |= CIFS_TRANSFORM_REQ;
4851
4852 memset(&rqst, 0, sizeof(struct smb_rqst));
4853 memset(&iov, 0, sizeof(iov));
4854 rqst.rq_iov = iov;
4855 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4856
4857 rc = SMB2_query_directory_init(xid, tcon, server,
4858 &rqst, persistent_fid,
4859 volatile_fid, index,
4860 srch_inf->info_level);
4861 if (rc)
4862 goto qdir_exit;
4863
4864 rc = cifs_send_recv(xid, ses, server,
4865 &rqst, &resp_buftype, flags, &rsp_iov);
4866 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4867
4868 if (rc) {
4869 if (rc == -ENODATA &&
4870 rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4871 trace_smb3_query_dir_done(xid, persistent_fid,
4872 tcon->tid, tcon->ses->Suid, index, 0);
4873 srch_inf->endOfSearch = true;
4874 rc = 0;
4875 } else {
4876 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4877 tcon->ses->Suid, index, 0, rc);
4878 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4879 }
4880 goto qdir_exit;
4881 }
4882
4883 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4884 srch_inf);
4885 if (rc) {
4886 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4887 tcon->ses->Suid, index, 0, rc);
4888 goto qdir_exit;
4889 }
4890 resp_buftype = CIFS_NO_BUFFER;
4891
4892 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4893 tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4894
4895qdir_exit:
4896 SMB2_query_directory_free(&rqst);
4897 free_rsp_buf(resp_buftype, rsp);
4898 return rc;
4899}
4900
4901int
4902SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4903 struct smb_rqst *rqst,
4904 u64 persistent_fid, u64 volatile_fid, u32 pid,
4905 u8 info_class, u8 info_type, u32 additional_info,
4906 void **data, unsigned int *size)
4907{
4908 struct smb2_set_info_req *req;
4909 struct kvec *iov = rqst->rq_iov;
4910 unsigned int i, total_len;
4911 int rc;
4912
4913 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4914 (void **) &req, &total_len);
4915 if (rc)
4916 return rc;
4917
4918 req->sync_hdr.ProcessId = cpu_to_le32(pid);
4919 req->InfoType = info_type;
4920 req->FileInfoClass = info_class;
4921 req->PersistentFileId = persistent_fid;
4922 req->VolatileFileId = volatile_fid;
4923 req->AdditionalInformation = cpu_to_le32(additional_info);
4924
4925 req->BufferOffset =
4926 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4927 req->BufferLength = cpu_to_le32(*size);
4928
4929 memcpy(req->Buffer, *data, *size);
4930 total_len += *size;
4931
4932 iov[0].iov_base = (char *)req;
4933 /* 1 for Buffer */
4934 iov[0].iov_len = total_len - 1;
4935
4936 for (i = 1; i < rqst->rq_nvec; i++) {
4937 le32_add_cpu(&req->BufferLength, size[i]);
4938 iov[i].iov_base = (char *)data[i];
4939 iov[i].iov_len = size[i];
4940 }
4941
4942 return 0;
4943}
4944
4945void
4946SMB2_set_info_free(struct smb_rqst *rqst)
4947{
4948 if (rqst && rqst->rq_iov)
4949 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4950}
4951
4952static int
4953send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4954 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4955 u8 info_type, u32 additional_info, unsigned int num,
4956 void **data, unsigned int *size)
4957{
4958 struct smb_rqst rqst;
4959 struct smb2_set_info_rsp *rsp = NULL;
4960 struct kvec *iov;
4961 struct kvec rsp_iov;
4962 int rc = 0;
4963 int resp_buftype;
4964 struct cifs_ses *ses = tcon->ses;
4965 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4966 int flags = 0;
4967
4968 if (!ses || !server)
4969 return -EIO;
4970
4971 if (!num)
4972 return -EINVAL;
4973
4974 if (smb3_encryption_required(tcon))
4975 flags |= CIFS_TRANSFORM_REQ;
4976
4977 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4978 if (!iov)
4979 return -ENOMEM;
4980
4981 memset(&rqst, 0, sizeof(struct smb_rqst));
4982 rqst.rq_iov = iov;
4983 rqst.rq_nvec = num;
4984
4985 rc = SMB2_set_info_init(tcon, server,
4986 &rqst, persistent_fid, volatile_fid, pid,
4987 info_class, info_type, additional_info,
4988 data, size);
4989 if (rc) {
4990 kfree(iov);
4991 return rc;
4992 }
4993
4994
4995 rc = cifs_send_recv(xid, ses, server,
4996 &rqst, &resp_buftype, flags,
4997 &rsp_iov);
4998 SMB2_set_info_free(&rqst);
4999 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5000
5001 if (rc != 0) {
5002 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5003 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5004 ses->Suid, info_class, (__u32)info_type, rc);
5005 }
5006
5007 free_rsp_buf(resp_buftype, rsp);
5008 kfree(iov);
5009 return rc;
5010}
5011
5012int
5013SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5014 u64 volatile_fid, u32 pid, __le64 *eof)
5015{
5016 struct smb2_file_eof_info info;
5017 void *data;
5018 unsigned int size;
5019
5020 info.EndOfFile = *eof;
5021
5022 data = &info;
5023 size = sizeof(struct smb2_file_eof_info);
5024
5025 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5026 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5027 0, 1, &data, &size);
5028}
5029
5030int
5031SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5032 u64 persistent_fid, u64 volatile_fid,
5033 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5034{
5035 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5036 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5037 1, (void **)&pnntsd, &pacllen);
5038}
5039
5040int
5041SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5042 u64 persistent_fid, u64 volatile_fid,
5043 struct smb2_file_full_ea_info *buf, int len)
5044{
5045 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5046 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5047 0, 1, (void **)&buf, &len);
5048}
5049
5050int
5051SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5052 const u64 persistent_fid, const u64 volatile_fid,
5053 __u8 oplock_level)
5054{
5055 struct smb_rqst rqst;
5056 int rc;
5057 struct smb2_oplock_break *req = NULL;
5058 struct cifs_ses *ses = tcon->ses;
5059 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5060 int flags = CIFS_OBREAK_OP;
5061 unsigned int total_len;
5062 struct kvec iov[1];
5063 struct kvec rsp_iov;
5064 int resp_buf_type;
5065
5066 cifs_dbg(FYI, "SMB2_oplock_break\n");
5067 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5068 (void **) &req, &total_len);
5069 if (rc)
5070 return rc;
5071
5072 if (smb3_encryption_required(tcon))
5073 flags |= CIFS_TRANSFORM_REQ;
5074
5075 req->VolatileFid = volatile_fid;
5076 req->PersistentFid = persistent_fid;
5077 req->OplockLevel = oplock_level;
5078 req->sync_hdr.CreditRequest = cpu_to_le16(1);
5079
5080 flags |= CIFS_NO_RSP_BUF;
5081
5082 iov[0].iov_base = (char *)req;
5083 iov[0].iov_len = total_len;
5084
5085 memset(&rqst, 0, sizeof(struct smb_rqst));
5086 rqst.rq_iov = iov;
5087 rqst.rq_nvec = 1;
5088
5089 rc = cifs_send_recv(xid, ses, server,
5090 &rqst, &resp_buf_type, flags, &rsp_iov);
5091 cifs_small_buf_release(req);
5092
5093 if (rc) {
5094 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5095 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5096 }
5097
5098 return rc;
5099}
5100
5101void
5102smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5103 struct kstatfs *kst)
5104{
5105 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5106 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5107 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5108 kst->f_bfree = kst->f_bavail =
5109 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5110 return;
5111}
5112
5113static void
5114copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5115 struct kstatfs *kst)
5116{
5117 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5118 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5119 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
5120 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5121 kst->f_bavail = kst->f_bfree;
5122 else
5123 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5124 if (response_data->TotalFileNodes != cpu_to_le64(-1))
5125 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5126 if (response_data->FreeFileNodes != cpu_to_le64(-1))
5127 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5128
5129 return;
5130}
5131
5132static int
5133build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5134 struct TCP_Server_Info *server,
5135 int level, int outbuf_len, u64 persistent_fid,
5136 u64 volatile_fid)
5137{
5138 int rc;
5139 struct smb2_query_info_req *req;
5140 unsigned int total_len;
5141
5142 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5143
5144 if ((tcon->ses == NULL) || server == NULL)
5145 return -EIO;
5146
5147 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5148 (void **) &req, &total_len);
5149 if (rc)
5150 return rc;
5151
5152 req->InfoType = SMB2_O_INFO_FILESYSTEM;
5153 req->FileInfoClass = level;
5154 req->PersistentFileId = persistent_fid;
5155 req->VolatileFileId = volatile_fid;
5156 /* 1 for pad */
5157 req->InputBufferOffset =
5158 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5159 req->OutputBufferLength = cpu_to_le32(
5160 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5161
5162 iov->iov_base = (char *)req;
5163 iov->iov_len = total_len;
5164 return 0;
5165}
5166
5167int
5168SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5169 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5170{
5171 struct smb_rqst rqst;
5172 struct smb2_query_info_rsp *rsp = NULL;
5173 struct kvec iov;
5174 struct kvec rsp_iov;
5175 int rc = 0;
5176 int resp_buftype;
5177 struct cifs_ses *ses = tcon->ses;
5178 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5179 FILE_SYSTEM_POSIX_INFO *info = NULL;
5180 int flags = 0;
5181
5182 rc = build_qfs_info_req(&iov, tcon, server,
5183 FS_POSIX_INFORMATION,
5184 sizeof(FILE_SYSTEM_POSIX_INFO),
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 posix_qfsinf_exit;
5202 }
5203 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5204
5205 info = (FILE_SYSTEM_POSIX_INFO *)(
5206 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5207 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5208 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5209 sizeof(FILE_SYSTEM_POSIX_INFO));
5210 if (!rc)
5211 copy_posix_fs_info_to_kstatfs(info, fsdata);
5212
5213posix_qfsinf_exit:
5214 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5215 return rc;
5216}
5217
5218int
5219SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5220 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5221{
5222 struct smb_rqst rqst;
5223 struct smb2_query_info_rsp *rsp = NULL;
5224 struct kvec iov;
5225 struct kvec rsp_iov;
5226 int rc = 0;
5227 int resp_buftype;
5228 struct cifs_ses *ses = tcon->ses;
5229 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5230 struct smb2_fs_full_size_info *info = NULL;
5231 int flags = 0;
5232
5233 rc = build_qfs_info_req(&iov, tcon, server,
5234 FS_FULL_SIZE_INFORMATION,
5235 sizeof(struct smb2_fs_full_size_info),
5236 persistent_fid, volatile_fid);
5237 if (rc)
5238 return rc;
5239
5240 if (smb3_encryption_required(tcon))
5241 flags |= CIFS_TRANSFORM_REQ;
5242
5243 memset(&rqst, 0, sizeof(struct smb_rqst));
5244 rqst.rq_iov = &iov;
5245 rqst.rq_nvec = 1;
5246
5247 rc = cifs_send_recv(xid, ses, server,
5248 &rqst, &resp_buftype, flags, &rsp_iov);
5249 cifs_small_buf_release(iov.iov_base);
5250 if (rc) {
5251 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5252 goto qfsinf_exit;
5253 }
5254 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5255
5256 info = (struct smb2_fs_full_size_info *)(
5257 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5258 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5259 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5260 sizeof(struct smb2_fs_full_size_info));
5261 if (!rc)
5262 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5263
5264qfsinf_exit:
5265 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5266 return rc;
5267}
5268
5269int
5270SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5271 u64 persistent_fid, u64 volatile_fid, int level)
5272{
5273 struct smb_rqst rqst;
5274 struct smb2_query_info_rsp *rsp = NULL;
5275 struct kvec iov;
5276 struct kvec rsp_iov;
5277 int rc = 0;
5278 int resp_buftype, max_len, min_len;
5279 struct cifs_ses *ses = tcon->ses;
5280 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5281 unsigned int rsp_len, offset;
5282 int flags = 0;
5283
5284 if (level == FS_DEVICE_INFORMATION) {
5285 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5286 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5287 } else if (level == FS_ATTRIBUTE_INFORMATION) {
5288 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5289 min_len = MIN_FS_ATTR_INFO_SIZE;
5290 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5291 max_len = sizeof(struct smb3_fs_ss_info);
5292 min_len = sizeof(struct smb3_fs_ss_info);
5293 } else if (level == FS_VOLUME_INFORMATION) {
5294 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5295 min_len = sizeof(struct smb3_fs_vol_info);
5296 } else {
5297 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5298 return -EINVAL;
5299 }
5300
5301 rc = build_qfs_info_req(&iov, tcon, server,
5302 level, max_len,
5303 persistent_fid, volatile_fid);
5304 if (rc)
5305 return rc;
5306
5307 if (smb3_encryption_required(tcon))
5308 flags |= CIFS_TRANSFORM_REQ;
5309
5310 memset(&rqst, 0, sizeof(struct smb_rqst));
5311 rqst.rq_iov = &iov;
5312 rqst.rq_nvec = 1;
5313
5314 rc = cifs_send_recv(xid, ses, server,
5315 &rqst, &resp_buftype, flags, &rsp_iov);
5316 cifs_small_buf_release(iov.iov_base);
5317 if (rc) {
5318 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5319 goto qfsattr_exit;
5320 }
5321 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5322
5323 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5324 offset = le16_to_cpu(rsp->OutputBufferOffset);
5325 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5326 if (rc)
5327 goto qfsattr_exit;
5328
5329 if (level == FS_ATTRIBUTE_INFORMATION)
5330 memcpy(&tcon->fsAttrInfo, offset
5331 + (char *)rsp, min_t(unsigned int,
5332 rsp_len, max_len));
5333 else if (level == FS_DEVICE_INFORMATION)
5334 memcpy(&tcon->fsDevInfo, offset
5335 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5336 else if (level == FS_SECTOR_SIZE_INFORMATION) {
5337 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5338 (offset + (char *)rsp);
5339 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5340 tcon->perf_sector_size =
5341 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5342 } else if (level == FS_VOLUME_INFORMATION) {
5343 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5344 (offset + (char *)rsp);
5345 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5346 tcon->vol_create_time = vol_info->VolumeCreationTime;
5347 }
5348
5349qfsattr_exit:
5350 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5351 return rc;
5352}
5353
5354int
5355smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5356 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5357 const __u32 num_lock, struct smb2_lock_element *buf)
5358{
5359 struct smb_rqst rqst;
5360 int rc = 0;
5361 struct smb2_lock_req *req = NULL;
5362 struct kvec iov[2];
5363 struct kvec rsp_iov;
5364 int resp_buf_type;
5365 unsigned int count;
5366 int flags = CIFS_NO_RSP_BUF;
5367 unsigned int total_len;
5368 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5369
5370 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5371
5372 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5373 (void **) &req, &total_len);
5374 if (rc)
5375 return rc;
5376
5377 if (smb3_encryption_required(tcon))
5378 flags |= CIFS_TRANSFORM_REQ;
5379
5380 req->sync_hdr.ProcessId = cpu_to_le32(pid);
5381 req->LockCount = cpu_to_le16(num_lock);
5382
5383 req->PersistentFileId = persist_fid;
5384 req->VolatileFileId = volatile_fid;
5385
5386 count = num_lock * sizeof(struct smb2_lock_element);
5387
5388 iov[0].iov_base = (char *)req;
5389 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5390 iov[1].iov_base = (char *)buf;
5391 iov[1].iov_len = count;
5392
5393 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5394
5395 memset(&rqst, 0, sizeof(struct smb_rqst));
5396 rqst.rq_iov = iov;
5397 rqst.rq_nvec = 2;
5398
5399 rc = cifs_send_recv(xid, tcon->ses, server,
5400 &rqst, &resp_buf_type, flags,
5401 &rsp_iov);
5402 cifs_small_buf_release(req);
5403 if (rc) {
5404 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5405 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5406 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5407 tcon->ses->Suid, rc);
5408 }
5409
5410 return rc;
5411}
5412
5413int
5414SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5415 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5416 const __u64 length, const __u64 offset, const __u32 lock_flags,
5417 const bool wait)
5418{
5419 struct smb2_lock_element lock;
5420
5421 lock.Offset = cpu_to_le64(offset);
5422 lock.Length = cpu_to_le64(length);
5423 lock.Flags = cpu_to_le32(lock_flags);
5424 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5425 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5426
5427 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5428}
5429
5430int
5431SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5432 __u8 *lease_key, const __le32 lease_state)
5433{
5434 struct smb_rqst rqst;
5435 int rc;
5436 struct smb2_lease_ack *req = NULL;
5437 struct cifs_ses *ses = tcon->ses;
5438 int flags = CIFS_OBREAK_OP;
5439 unsigned int total_len;
5440 struct kvec iov[1];
5441 struct kvec rsp_iov;
5442 int resp_buf_type;
5443 __u64 *please_key_high;
5444 __u64 *please_key_low;
5445 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5446
5447 cifs_dbg(FYI, "SMB2_lease_break\n");
5448 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5449 (void **) &req, &total_len);
5450 if (rc)
5451 return rc;
5452
5453 if (smb3_encryption_required(tcon))
5454 flags |= CIFS_TRANSFORM_REQ;
5455
5456 req->sync_hdr.CreditRequest = cpu_to_le16(1);
5457 req->StructureSize = cpu_to_le16(36);
5458 total_len += 12;
5459
5460 memcpy(req->LeaseKey, lease_key, 16);
5461 req->LeaseState = lease_state;
5462
5463 flags |= CIFS_NO_RSP_BUF;
5464
5465 iov[0].iov_base = (char *)req;
5466 iov[0].iov_len = total_len;
5467
5468 memset(&rqst, 0, sizeof(struct smb_rqst));
5469 rqst.rq_iov = iov;
5470 rqst.rq_nvec = 1;
5471
5472 rc = cifs_send_recv(xid, ses, server,
5473 &rqst, &resp_buf_type, flags, &rsp_iov);
5474 cifs_small_buf_release(req);
5475
5476 please_key_low = (__u64 *)lease_key;
5477 please_key_high = (__u64 *)(lease_key+8);
5478 if (rc) {
5479 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5480 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5481 ses->Suid, *please_key_low, *please_key_high, rc);
5482 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5483 } else
5484 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5485 ses->Suid, *please_key_low, *please_key_high);
5486
5487 return rc;
5488}