1 /*
2 * fs/cifs/smb2pdu.c
3 *
4 * Copyright (C) International Business Machines Corp., 2009, 2013
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * Contains the routines for constructing the SMB2 PDUs themselves
10 *
11 * This library is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published
13 * by the Free Software Foundation; either version 2.1 of the License, or
14 * (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
19 * the GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this library; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
27 /* Note that there are handle based routines which must be */
28 /* treated slightly differently for reconnection purposes since we never */
29 /* want to reuse a stale file handle and only the caller knows the file info */
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/vfs.h>
34 #include <linux/task_io_accounting_ops.h>
35 #include <linux/uaccess.h>
36 #include <linux/uuid.h>
37 #include <linux/pagemap.h>
38 #include <linux/xattr.h>
39 #include "smb2pdu.h"
40 #include "cifsglob.h"
41 #include "cifsacl.h"
42 #include "cifsproto.h"
43 #include "smb2proto.h"
44 #include "cifs_unicode.h"
45 #include "cifs_debug.h"
46 #include "ntlmssp.h"
47 #include "smb2status.h"
48 #include "smb2glob.h"
49 #include "cifspdu.h"
50 #include "cifs_spnego.h"
51 #include "smbdirect.h"
52 #include "trace.h"
53 #ifdef CONFIG_CIFS_DFS_UPCALL
54 #include "dfs_cache.h"
55 #endif
56
57 /*
58 * The following table defines the expected "StructureSize" of SMB2 requests
59 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
60 *
61 * Note that commands are defined in smb2pdu.h in le16 but the array below is
62 * indexed by command in host byte order.
63 */
64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
65 /* SMB2_NEGOTIATE */ 36,
66 /* SMB2_SESSION_SETUP */ 25,
67 /* SMB2_LOGOFF */ 4,
68 /* SMB2_TREE_CONNECT */ 9,
69 /* SMB2_TREE_DISCONNECT */ 4,
70 /* SMB2_CREATE */ 57,
71 /* SMB2_CLOSE */ 24,
72 /* SMB2_FLUSH */ 24,
73 /* SMB2_READ */ 49,
74 /* SMB2_WRITE */ 49,
75 /* SMB2_LOCK */ 48,
76 /* SMB2_IOCTL */ 57,
77 /* SMB2_CANCEL */ 4,
78 /* SMB2_ECHO */ 4,
79 /* SMB2_QUERY_DIRECTORY */ 33,
80 /* SMB2_CHANGE_NOTIFY */ 32,
81 /* SMB2_QUERY_INFO */ 41,
82 /* SMB2_SET_INFO */ 33,
83 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
84 };
85
smb3_encryption_required(const struct cifs_tcon * tcon)86 int smb3_encryption_required(const struct cifs_tcon *tcon)
87 {
88 if (!tcon || !tcon->ses)
89 return 0;
90 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
91 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
92 return 1;
93 if (tcon->seal &&
94 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
95 return 1;
96 return 0;
97 }
98
99 static void
smb2_hdr_assemble(struct smb2_sync_hdr * shdr,__le16 smb2_cmd,const struct cifs_tcon * tcon,struct TCP_Server_Info * server)100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
101 const struct cifs_tcon *tcon,
102 struct TCP_Server_Info *server)
103 {
104 shdr->ProtocolId = SMB2_PROTO_NUMBER;
105 shdr->StructureSize = cpu_to_le16(64);
106 shdr->Command = smb2_cmd;
107 if (server) {
108 spin_lock(&server->req_lock);
109 /* Request up to 10 credits but don't go over the limit. */
110 if (server->credits >= server->max_credits)
111 shdr->CreditRequest = cpu_to_le16(0);
112 else
113 shdr->CreditRequest = cpu_to_le16(
114 min_t(int, server->max_credits -
115 server->credits, 10));
116 spin_unlock(&server->req_lock);
117 } else {
118 shdr->CreditRequest = cpu_to_le16(2);
119 }
120 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
121
122 if (!tcon)
123 goto out;
124
125 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
126 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
127 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
128 shdr->CreditCharge = cpu_to_le16(1);
129 /* else CreditCharge MBZ */
130
131 shdr->TreeId = tcon->tid;
132 /* Uid is not converted */
133 if (tcon->ses)
134 shdr->SessionId = tcon->ses->Suid;
135
136 /*
137 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
138 * to pass the path on the Open SMB prefixed by \\server\share.
139 * Not sure when we would need to do the augmented path (if ever) and
140 * setting this flag breaks the SMB2 open operation since it is
141 * illegal to send an empty path name (without \\server\share prefix)
142 * when the DFS flag is set in the SMB open header. We could
143 * consider setting the flag on all operations other than open
144 * but it is safer to net set it for now.
145 */
146 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
147 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
148
149 if (server && server->sign && !smb3_encryption_required(tcon))
150 shdr->Flags |= SMB2_FLAGS_SIGNED;
151 out:
152 return;
153 }
154
155 static int
smb2_reconnect(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server)156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
157 struct TCP_Server_Info *server)
158 {
159 int rc;
160 struct nls_table *nls_codepage;
161 struct cifs_ses *ses;
162 int retries;
163
164 /*
165 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
166 * check for tcp and smb session status done differently
167 * for those three - in the calling routine.
168 */
169 if (tcon == NULL)
170 return 0;
171
172 if (smb2_command == SMB2_TREE_CONNECT)
173 return 0;
174
175 if (tcon->tidStatus == CifsExiting) {
176 /*
177 * only tree disconnect, open, and write,
178 * (and ulogoff which does not have tcon)
179 * are allowed as we start force umount.
180 */
181 if ((smb2_command != SMB2_WRITE) &&
182 (smb2_command != SMB2_CREATE) &&
183 (smb2_command != SMB2_TREE_DISCONNECT)) {
184 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
185 smb2_command);
186 return -ENODEV;
187 }
188 }
189 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
190 (!tcon->ses->server) || !server)
191 return -EIO;
192
193 ses = tcon->ses;
194 retries = server->nr_targets;
195
196 /*
197 * Give demultiplex thread up to 10 seconds to each target available for
198 * reconnect -- should be greater than cifs socket timeout which is 7
199 * seconds.
200 */
201 while (server->tcpStatus == CifsNeedReconnect) {
202 /*
203 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
204 * here since they are implicitly done when session drops.
205 */
206 switch (smb2_command) {
207 /*
208 * BB Should we keep oplock break and add flush to exceptions?
209 */
210 case SMB2_TREE_DISCONNECT:
211 case SMB2_CANCEL:
212 case SMB2_CLOSE:
213 case SMB2_OPLOCK_BREAK:
214 return -EAGAIN;
215 }
216
217 rc = wait_event_interruptible_timeout(server->response_q,
218 (server->tcpStatus != CifsNeedReconnect),
219 10 * HZ);
220 if (rc < 0) {
221 cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
222 __func__);
223 return -ERESTARTSYS;
224 }
225
226 /* are we still trying to reconnect? */
227 if (server->tcpStatus != CifsNeedReconnect)
228 break;
229
230 if (retries && --retries)
231 continue;
232
233 /*
234 * on "soft" mounts we wait once. Hard mounts keep
235 * retrying until process is killed or server comes
236 * back on-line
237 */
238 if (!tcon->retry) {
239 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
240 return -EHOSTDOWN;
241 }
242 retries = server->nr_targets;
243 }
244
245 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
246 return 0;
247
248 nls_codepage = load_nls_default();
249
250 /*
251 * need to prevent multiple threads trying to simultaneously reconnect
252 * the same SMB session
253 */
254 mutex_lock(&tcon->ses->session_mutex);
255
256 /*
257 * Recheck after acquire mutex. If another thread is negotiating
258 * and the server never sends an answer the socket will be closed
259 * and tcpStatus set to reconnect.
260 */
261 if (server->tcpStatus == CifsNeedReconnect) {
262 rc = -EHOSTDOWN;
263 mutex_unlock(&tcon->ses->session_mutex);
264 goto out;
265 }
266
267 /*
268 * If we are reconnecting an extra channel, bind
269 */
270 if (server->is_channel) {
271 ses->binding = true;
272 ses->binding_chan = cifs_ses_find_chan(ses, server);
273 }
274
275 rc = cifs_negotiate_protocol(0, tcon->ses);
276 if (!rc && tcon->ses->need_reconnect) {
277 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
278 if ((rc == -EACCES) && !tcon->retry) {
279 rc = -EHOSTDOWN;
280 ses->binding = false;
281 ses->binding_chan = NULL;
282 mutex_unlock(&tcon->ses->session_mutex);
283 goto failed;
284 }
285 }
286 /*
287 * End of channel binding
288 */
289 ses->binding = false;
290 ses->binding_chan = NULL;
291
292 if (rc || !tcon->need_reconnect) {
293 mutex_unlock(&tcon->ses->session_mutex);
294 goto out;
295 }
296
297 cifs_mark_open_files_invalid(tcon);
298 if (tcon->use_persistent)
299 tcon->need_reopen_files = true;
300
301 rc = cifs_tree_connect(0, tcon, nls_codepage);
302 mutex_unlock(&tcon->ses->session_mutex);
303
304 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
305 if (rc) {
306 /* If sess reconnected but tcon didn't, something strange ... */
307 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
308 goto out;
309 }
310
311 if (smb2_command != SMB2_INTERNAL_CMD)
312 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
313
314 atomic_inc(&tconInfoReconnectCount);
315 out:
316 /*
317 * Check if handle based operation so we know whether we can continue
318 * or not without returning to caller to reset file handle.
319 */
320 /*
321 * BB Is flush done by server on drop of tcp session? Should we special
322 * case it and skip above?
323 */
324 switch (smb2_command) {
325 case SMB2_FLUSH:
326 case SMB2_READ:
327 case SMB2_WRITE:
328 case SMB2_LOCK:
329 case SMB2_IOCTL:
330 case SMB2_QUERY_DIRECTORY:
331 case SMB2_CHANGE_NOTIFY:
332 case SMB2_QUERY_INFO:
333 case SMB2_SET_INFO:
334 rc = -EAGAIN;
335 }
336 failed:
337 unload_nls(nls_codepage);
338 return rc;
339 }
340
341 static void
fill_small_buf(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void * buf,unsigned int * total_len)342 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
343 struct TCP_Server_Info *server,
344 void *buf,
345 unsigned int *total_len)
346 {
347 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
348 /* lookup word count ie StructureSize from table */
349 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
350
351 /*
352 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
353 * largest operations (Create)
354 */
355 memset(buf, 0, 256);
356
357 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
358 spdu->StructureSize2 = cpu_to_le16(parmsize);
359
360 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
361 }
362
363 /*
364 * Allocate and return pointer to an SMB request hdr, and set basic
365 * SMB information in the SMB header. If the return code is zero, this
366 * function must have filled in request_buf pointer.
367 */
__smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)368 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
369 struct TCP_Server_Info *server,
370 void **request_buf, unsigned int *total_len)
371 {
372 /* BB eventually switch this to SMB2 specific small buf size */
373 if (smb2_command == SMB2_SET_INFO)
374 *request_buf = cifs_buf_get();
375 else
376 *request_buf = cifs_small_buf_get();
377 if (*request_buf == NULL) {
378 /* BB should we add a retry in here if not a writepage? */
379 return -ENOMEM;
380 }
381
382 fill_small_buf(smb2_command, tcon, server,
383 (struct smb2_sync_hdr *)(*request_buf),
384 total_len);
385
386 if (tcon != NULL) {
387 uint16_t com_code = le16_to_cpu(smb2_command);
388 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
389 cifs_stats_inc(&tcon->num_smbs_sent);
390 }
391
392 return 0;
393 }
394
smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)395 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
396 struct TCP_Server_Info *server,
397 void **request_buf, unsigned int *total_len)
398 {
399 int rc;
400
401 rc = smb2_reconnect(smb2_command, tcon, server);
402 if (rc)
403 return rc;
404
405 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
406 total_len);
407 }
408
smb2_ioctl_req_init(u32 opcode,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)409 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
410 struct TCP_Server_Info *server,
411 void **request_buf, unsigned int *total_len)
412 {
413 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
414 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
415 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
416 request_buf, total_len);
417 }
418 return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
419 request_buf, total_len);
420 }
421
422 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
423
424 static void
build_preauth_ctxt(struct smb2_preauth_neg_context * pneg_ctxt)425 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
426 {
427 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
428 pneg_ctxt->DataLength = cpu_to_le16(38);
429 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
430 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
431 get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
432 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
433 }
434
435 static void
build_compression_ctxt(struct smb2_compression_capabilities_context * pneg_ctxt)436 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
437 {
438 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
439 pneg_ctxt->DataLength =
440 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
441 - sizeof(struct smb2_neg_context));
442 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
443 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
444 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
445 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
446 }
447
448 static void
build_encrypt_ctxt(struct smb2_encryption_neg_context * pneg_ctxt)449 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
450 {
451 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
452 if (require_gcm_256) {
453 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
454 pneg_ctxt->CipherCount = cpu_to_le16(1);
455 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
456 } else if (enable_gcm_256) {
457 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
458 pneg_ctxt->CipherCount = cpu_to_le16(3);
459 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
460 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
461 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
462 } else {
463 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
464 pneg_ctxt->CipherCount = cpu_to_le16(2);
465 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
466 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
467 }
468 }
469
470 static unsigned int
build_netname_ctxt(struct smb2_netname_neg_context * pneg_ctxt,char * hostname)471 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
472 {
473 struct nls_table *cp = load_nls_default();
474
475 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
476
477 /* copy up to max of first 100 bytes of server name to NetName field */
478 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
479 /* context size is DataLength + minimal smb2_neg_context */
480 return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
481 sizeof(struct smb2_neg_context), 8) * 8;
482 }
483
484 static void
build_posix_ctxt(struct smb2_posix_neg_context * pneg_ctxt)485 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
486 {
487 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
488 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
489 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
490 pneg_ctxt->Name[0] = 0x93;
491 pneg_ctxt->Name[1] = 0xAD;
492 pneg_ctxt->Name[2] = 0x25;
493 pneg_ctxt->Name[3] = 0x50;
494 pneg_ctxt->Name[4] = 0x9C;
495 pneg_ctxt->Name[5] = 0xB4;
496 pneg_ctxt->Name[6] = 0x11;
497 pneg_ctxt->Name[7] = 0xE7;
498 pneg_ctxt->Name[8] = 0xB4;
499 pneg_ctxt->Name[9] = 0x23;
500 pneg_ctxt->Name[10] = 0x83;
501 pneg_ctxt->Name[11] = 0xDE;
502 pneg_ctxt->Name[12] = 0x96;
503 pneg_ctxt->Name[13] = 0x8B;
504 pneg_ctxt->Name[14] = 0xCD;
505 pneg_ctxt->Name[15] = 0x7C;
506 }
507
508 static void
assemble_neg_contexts(struct smb2_negotiate_req * req,struct TCP_Server_Info * server,unsigned int * total_len)509 assemble_neg_contexts(struct smb2_negotiate_req *req,
510 struct TCP_Server_Info *server, unsigned int *total_len)
511 {
512 char *pneg_ctxt;
513 unsigned int ctxt_len;
514
515 if (*total_len > 200) {
516 /* In case length corrupted don't want to overrun smb buffer */
517 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
518 return;
519 }
520
521 /*
522 * round up total_len of fixed part of SMB3 negotiate request to 8
523 * byte boundary before adding negotiate contexts
524 */
525 *total_len = roundup(*total_len, 8);
526
527 pneg_ctxt = (*total_len) + (char *)req;
528 req->NegotiateContextOffset = cpu_to_le32(*total_len);
529
530 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
531 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
532 *total_len += ctxt_len;
533 pneg_ctxt += ctxt_len;
534
535 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
536 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
537 *total_len += ctxt_len;
538 pneg_ctxt += ctxt_len;
539
540 if (server->compress_algorithm) {
541 build_compression_ctxt((struct smb2_compression_capabilities_context *)
542 pneg_ctxt);
543 ctxt_len = DIV_ROUND_UP(
544 sizeof(struct smb2_compression_capabilities_context),
545 8) * 8;
546 *total_len += ctxt_len;
547 pneg_ctxt += ctxt_len;
548 req->NegotiateContextCount = cpu_to_le16(5);
549 } else
550 req->NegotiateContextCount = cpu_to_le16(4);
551
552 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
553 server->hostname);
554 *total_len += ctxt_len;
555 pneg_ctxt += ctxt_len;
556
557 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
558 *total_len += sizeof(struct smb2_posix_neg_context);
559 }
560
decode_preauth_context(struct smb2_preauth_neg_context * ctxt)561 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
562 {
563 unsigned int len = le16_to_cpu(ctxt->DataLength);
564
565 /* If invalid preauth context warn but use what we requested, SHA-512 */
566 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
567 pr_warn_once("server sent bad preauth context\n");
568 return;
569 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
570 pr_warn_once("server sent invalid SaltLength\n");
571 return;
572 }
573 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
574 pr_warn_once("Invalid SMB3 hash algorithm count\n");
575 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
576 pr_warn_once("unknown SMB3 hash algorithm\n");
577 }
578
decode_compress_ctx(struct TCP_Server_Info * server,struct smb2_compression_capabilities_context * ctxt)579 static void decode_compress_ctx(struct TCP_Server_Info *server,
580 struct smb2_compression_capabilities_context *ctxt)
581 {
582 unsigned int len = le16_to_cpu(ctxt->DataLength);
583
584 /* sizeof compress context is a one element compression capbility struct */
585 if (len < 10) {
586 pr_warn_once("server sent bad compression cntxt\n");
587 return;
588 }
589 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
590 pr_warn_once("Invalid SMB3 compress algorithm count\n");
591 return;
592 }
593 if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
594 pr_warn_once("unknown compression algorithm\n");
595 return;
596 }
597 server->compress_algorithm = ctxt->CompressionAlgorithms[0];
598 }
599
decode_encrypt_ctx(struct TCP_Server_Info * server,struct smb2_encryption_neg_context * ctxt)600 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
601 struct smb2_encryption_neg_context *ctxt)
602 {
603 unsigned int len = le16_to_cpu(ctxt->DataLength);
604
605 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
606 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
607 pr_warn_once("server sent bad crypto ctxt len\n");
608 return -EINVAL;
609 }
610
611 if (le16_to_cpu(ctxt->CipherCount) != 1) {
612 pr_warn_once("Invalid SMB3.11 cipher count\n");
613 return -EINVAL;
614 }
615 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
616 if (require_gcm_256) {
617 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
618 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
619 return -EOPNOTSUPP;
620 }
621 } else if (ctxt->Ciphers[0] == 0) {
622 /*
623 * e.g. if server only supported AES256_CCM (very unlikely)
624 * or server supported no encryption types or had all disabled.
625 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
626 * in which mount requested encryption ("seal") checks later
627 * on during tree connection will return proper rc, but if
628 * seal not requested by client, since server is allowed to
629 * return 0 to indicate no supported cipher, we can't fail here
630 */
631 server->cipher_type = 0;
632 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
633 pr_warn_once("Server does not support requested encryption types\n");
634 return 0;
635 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
636 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
637 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
638 /* server returned a cipher we didn't ask for */
639 pr_warn_once("Invalid SMB3.11 cipher returned\n");
640 return -EINVAL;
641 }
642 server->cipher_type = ctxt->Ciphers[0];
643 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
644 return 0;
645 }
646
smb311_decode_neg_context(struct smb2_negotiate_rsp * rsp,struct TCP_Server_Info * server,unsigned int len_of_smb)647 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
648 struct TCP_Server_Info *server,
649 unsigned int len_of_smb)
650 {
651 struct smb2_neg_context *pctx;
652 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
653 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
654 unsigned int len_of_ctxts, i;
655 int rc = 0;
656
657 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
658 if (len_of_smb <= offset) {
659 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
660 return -EINVAL;
661 }
662
663 len_of_ctxts = len_of_smb - offset;
664
665 for (i = 0; i < ctxt_cnt; i++) {
666 int clen;
667 /* check that offset is not beyond end of SMB */
668 if (len_of_ctxts == 0)
669 break;
670
671 if (len_of_ctxts < sizeof(struct smb2_neg_context))
672 break;
673
674 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
675 clen = le16_to_cpu(pctx->DataLength);
676 if (clen > len_of_ctxts)
677 break;
678
679 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
680 decode_preauth_context(
681 (struct smb2_preauth_neg_context *)pctx);
682 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
683 rc = decode_encrypt_ctx(server,
684 (struct smb2_encryption_neg_context *)pctx);
685 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
686 decode_compress_ctx(server,
687 (struct smb2_compression_capabilities_context *)pctx);
688 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
689 server->posix_ext_supported = true;
690 else
691 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
692 le16_to_cpu(pctx->ContextType));
693
694 if (rc)
695 break;
696 /* offsets must be 8 byte aligned */
697 clen = (clen + 7) & ~0x7;
698 offset += clen + sizeof(struct smb2_neg_context);
699 len_of_ctxts -= clen;
700 }
701 return rc;
702 }
703
704 static struct create_posix *
create_posix_buf(umode_t mode)705 create_posix_buf(umode_t mode)
706 {
707 struct create_posix *buf;
708
709 buf = kzalloc(sizeof(struct create_posix),
710 GFP_KERNEL);
711 if (!buf)
712 return NULL;
713
714 buf->ccontext.DataOffset =
715 cpu_to_le16(offsetof(struct create_posix, Mode));
716 buf->ccontext.DataLength = cpu_to_le32(4);
717 buf->ccontext.NameOffset =
718 cpu_to_le16(offsetof(struct create_posix, Name));
719 buf->ccontext.NameLength = cpu_to_le16(16);
720
721 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
722 buf->Name[0] = 0x93;
723 buf->Name[1] = 0xAD;
724 buf->Name[2] = 0x25;
725 buf->Name[3] = 0x50;
726 buf->Name[4] = 0x9C;
727 buf->Name[5] = 0xB4;
728 buf->Name[6] = 0x11;
729 buf->Name[7] = 0xE7;
730 buf->Name[8] = 0xB4;
731 buf->Name[9] = 0x23;
732 buf->Name[10] = 0x83;
733 buf->Name[11] = 0xDE;
734 buf->Name[12] = 0x96;
735 buf->Name[13] = 0x8B;
736 buf->Name[14] = 0xCD;
737 buf->Name[15] = 0x7C;
738 buf->Mode = cpu_to_le32(mode);
739 cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
740 return buf;
741 }
742
743 static int
add_posix_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode)744 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
745 {
746 struct smb2_create_req *req = iov[0].iov_base;
747 unsigned int num = *num_iovec;
748
749 iov[num].iov_base = create_posix_buf(mode);
750 if (mode == ACL_NO_MODE)
751 cifs_dbg(FYI, "Invalid mode\n");
752 if (iov[num].iov_base == NULL)
753 return -ENOMEM;
754 iov[num].iov_len = sizeof(struct create_posix);
755 if (!req->CreateContextsOffset)
756 req->CreateContextsOffset = cpu_to_le32(
757 sizeof(struct smb2_create_req) +
758 iov[num - 1].iov_len);
759 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
760 *num_iovec = num + 1;
761 return 0;
762 }
763
764
765 /*
766 *
767 * SMB2 Worker functions follow:
768 *
769 * The general structure of the worker functions is:
770 * 1) Call smb2_init (assembles SMB2 header)
771 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
772 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
773 * 4) Decode SMB2 command specific fields in the fixed length area
774 * 5) Decode variable length data area (if any for this SMB2 command type)
775 * 6) Call free smb buffer
776 * 7) return
777 *
778 */
779
780 int
SMB2_negotiate(const unsigned int xid,struct cifs_ses * ses)781 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
782 {
783 struct smb_rqst rqst;
784 struct smb2_negotiate_req *req;
785 struct smb2_negotiate_rsp *rsp;
786 struct kvec iov[1];
787 struct kvec rsp_iov;
788 int rc = 0;
789 int resp_buftype;
790 struct TCP_Server_Info *server = cifs_ses_server(ses);
791 int blob_offset, blob_length;
792 char *security_blob;
793 int flags = CIFS_NEG_OP;
794 unsigned int total_len;
795
796 cifs_dbg(FYI, "Negotiate protocol\n");
797
798 if (!server) {
799 WARN(1, "%s: server is NULL!\n", __func__);
800 return -EIO;
801 }
802
803 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
804 (void **) &req, &total_len);
805 if (rc)
806 return rc;
807
808 req->sync_hdr.SessionId = 0;
809
810 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
811 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
812
813 if (strcmp(server->vals->version_string,
814 SMB3ANY_VERSION_STRING) == 0) {
815 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
816 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
817 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
818 req->DialectCount = cpu_to_le16(3);
819 total_len += 6;
820 } else if (strcmp(server->vals->version_string,
821 SMBDEFAULT_VERSION_STRING) == 0) {
822 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
823 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
824 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
825 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
826 req->DialectCount = cpu_to_le16(4);
827 total_len += 8;
828 } else {
829 /* otherwise send specific dialect */
830 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
831 req->DialectCount = cpu_to_le16(1);
832 total_len += 2;
833 }
834
835 /* only one of SMB2 signing flags may be set in SMB2 request */
836 if (ses->sign)
837 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
838 else if (global_secflags & CIFSSEC_MAY_SIGN)
839 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
840 else
841 req->SecurityMode = 0;
842
843 req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
844 if (ses->chan_max > 1)
845 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
846
847 /* ClientGUID must be zero for SMB2.02 dialect */
848 if (server->vals->protocol_id == SMB20_PROT_ID)
849 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
850 else {
851 memcpy(req->ClientGUID, server->client_guid,
852 SMB2_CLIENT_GUID_SIZE);
853 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
854 (strcmp(server->vals->version_string,
855 SMB3ANY_VERSION_STRING) == 0) ||
856 (strcmp(server->vals->version_string,
857 SMBDEFAULT_VERSION_STRING) == 0))
858 assemble_neg_contexts(req, server, &total_len);
859 }
860 iov[0].iov_base = (char *)req;
861 iov[0].iov_len = total_len;
862
863 memset(&rqst, 0, sizeof(struct smb_rqst));
864 rqst.rq_iov = iov;
865 rqst.rq_nvec = 1;
866
867 rc = cifs_send_recv(xid, ses, server,
868 &rqst, &resp_buftype, flags, &rsp_iov);
869 cifs_small_buf_release(req);
870 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
871 /*
872 * No tcon so can't do
873 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
874 */
875 if (rc == -EOPNOTSUPP) {
876 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");
877 goto neg_exit;
878 } else if (rc != 0)
879 goto neg_exit;
880
881 if (strcmp(server->vals->version_string,
882 SMB3ANY_VERSION_STRING) == 0) {
883 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
884 cifs_server_dbg(VFS,
885 "SMB2 dialect returned but not requested\n");
886 return -EIO;
887 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
888 cifs_server_dbg(VFS,
889 "SMB2.1 dialect returned but not requested\n");
890 return -EIO;
891 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
892 /* ops set to 3.0 by default for default so update */
893 server->ops = &smb311_operations;
894 server->vals = &smb311_values;
895 }
896 } else if (strcmp(server->vals->version_string,
897 SMBDEFAULT_VERSION_STRING) == 0) {
898 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
899 cifs_server_dbg(VFS,
900 "SMB2 dialect returned but not requested\n");
901 return -EIO;
902 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
903 /* ops set to 3.0 by default for default so update */
904 server->ops = &smb21_operations;
905 server->vals = &smb21_values;
906 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
907 server->ops = &smb311_operations;
908 server->vals = &smb311_values;
909 }
910 } else if (le16_to_cpu(rsp->DialectRevision) !=
911 server->vals->protocol_id) {
912 /* if requested single dialect ensure returned dialect matched */
913 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
914 le16_to_cpu(rsp->DialectRevision));
915 return -EIO;
916 }
917
918 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
919
920 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
921 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
922 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
923 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
924 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
925 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
926 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
927 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
928 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
929 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
930 else {
931 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
932 le16_to_cpu(rsp->DialectRevision));
933 rc = -EIO;
934 goto neg_exit;
935 }
936 server->dialect = le16_to_cpu(rsp->DialectRevision);
937
938 /*
939 * Keep a copy of the hash after negprot. This hash will be
940 * the starting hash value for all sessions made from this
941 * server.
942 */
943 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
944 SMB2_PREAUTH_HASH_SIZE);
945
946 /* SMB2 only has an extended negflavor */
947 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
948 /* set it to the maximum buffer size value we can send with 1 credit */
949 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
950 SMB2_MAX_BUFFER_SIZE);
951 server->max_read = le32_to_cpu(rsp->MaxReadSize);
952 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
953 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
954 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
955 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
956 server->sec_mode);
957 server->capabilities = le32_to_cpu(rsp->Capabilities);
958 /* Internal types */
959 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
960
961 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
962 (struct smb2_sync_hdr *)rsp);
963 /*
964 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
965 * for us will be
966 * ses->sectype = RawNTLMSSP;
967 * but for time being this is our only auth choice so doesn't matter.
968 * We just found a server which sets blob length to zero expecting raw.
969 */
970 if (blob_length == 0) {
971 cifs_dbg(FYI, "missing security blob on negprot\n");
972 server->sec_ntlmssp = true;
973 }
974
975 rc = cifs_enable_signing(server, ses->sign);
976 if (rc)
977 goto neg_exit;
978 if (blob_length) {
979 rc = decode_negTokenInit(security_blob, blob_length, server);
980 if (rc == 1)
981 rc = 0;
982 else if (rc == 0)
983 rc = -EIO;
984 }
985
986 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
987 if (rsp->NegotiateContextCount)
988 rc = smb311_decode_neg_context(rsp, server,
989 rsp_iov.iov_len);
990 else
991 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
992 }
993 neg_exit:
994 free_rsp_buf(resp_buftype, rsp);
995 return rc;
996 }
997
smb3_validate_negotiate(const unsigned int xid,struct cifs_tcon * tcon)998 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
999 {
1000 int rc;
1001 struct validate_negotiate_info_req *pneg_inbuf;
1002 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1003 u32 rsplen;
1004 u32 inbuflen; /* max of 4 dialects */
1005 struct TCP_Server_Info *server = tcon->ses->server;
1006
1007 cifs_dbg(FYI, "validate negotiate\n");
1008
1009 /* In SMB3.11 preauth integrity supersedes validate negotiate */
1010 if (server->dialect == SMB311_PROT_ID)
1011 return 0;
1012
1013 /*
1014 * validation ioctl must be signed, so no point sending this if we
1015 * can not sign it (ie are not known user). Even if signing is not
1016 * required (enabled but not negotiated), in those cases we selectively
1017 * sign just this, the first and only signed request on a connection.
1018 * Having validation of negotiate info helps reduce attack vectors.
1019 */
1020 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1021 return 0; /* validation requires signing */
1022
1023 if (tcon->ses->user_name == NULL) {
1024 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1025 return 0; /* validation requires signing */
1026 }
1027
1028 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1029 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1030
1031 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1032 if (!pneg_inbuf)
1033 return -ENOMEM;
1034
1035 pneg_inbuf->Capabilities =
1036 cpu_to_le32(server->vals->req_capabilities);
1037 if (tcon->ses->chan_max > 1)
1038 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1039
1040 memcpy(pneg_inbuf->Guid, server->client_guid,
1041 SMB2_CLIENT_GUID_SIZE);
1042
1043 if (tcon->ses->sign)
1044 pneg_inbuf->SecurityMode =
1045 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1046 else if (global_secflags & CIFSSEC_MAY_SIGN)
1047 pneg_inbuf->SecurityMode =
1048 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1049 else
1050 pneg_inbuf->SecurityMode = 0;
1051
1052
1053 if (strcmp(server->vals->version_string,
1054 SMB3ANY_VERSION_STRING) == 0) {
1055 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1056 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1057 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1058 pneg_inbuf->DialectCount = cpu_to_le16(3);
1059 /* SMB 2.1 not included so subtract one dialect from len */
1060 inbuflen = sizeof(*pneg_inbuf) -
1061 (sizeof(pneg_inbuf->Dialects[0]));
1062 } else if (strcmp(server->vals->version_string,
1063 SMBDEFAULT_VERSION_STRING) == 0) {
1064 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1065 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1066 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1067 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1068 pneg_inbuf->DialectCount = cpu_to_le16(4);
1069 /* structure is big enough for 4 dialects */
1070 inbuflen = sizeof(*pneg_inbuf);
1071 } else {
1072 /* otherwise specific dialect was requested */
1073 pneg_inbuf->Dialects[0] =
1074 cpu_to_le16(server->vals->protocol_id);
1075 pneg_inbuf->DialectCount = cpu_to_le16(1);
1076 /* structure is big enough for 3 dialects, sending only 1 */
1077 inbuflen = sizeof(*pneg_inbuf) -
1078 sizeof(pneg_inbuf->Dialects[0]) * 2;
1079 }
1080
1081 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1082 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1083 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1084 (char **)&pneg_rsp, &rsplen);
1085 if (rc == -EOPNOTSUPP) {
1086 /*
1087 * Old Windows versions or Netapp SMB server can return
1088 * not supported error. Client should accept it.
1089 */
1090 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1091 rc = 0;
1092 goto out_free_inbuf;
1093 } else if (rc != 0) {
1094 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1095 rc);
1096 rc = -EIO;
1097 goto out_free_inbuf;
1098 }
1099
1100 rc = -EIO;
1101 if (rsplen != sizeof(*pneg_rsp)) {
1102 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1103 rsplen);
1104
1105 /* relax check since Mac returns max bufsize allowed on ioctl */
1106 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1107 goto out_free_rsp;
1108 }
1109
1110 /* check validate negotiate info response matches what we got earlier */
1111 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1112 goto vneg_out;
1113
1114 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1115 goto vneg_out;
1116
1117 /* do not validate server guid because not saved at negprot time yet */
1118
1119 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1120 SMB2_LARGE_FILES) != server->capabilities)
1121 goto vneg_out;
1122
1123 /* validate negotiate successful */
1124 rc = 0;
1125 cifs_dbg(FYI, "validate negotiate info successful\n");
1126 goto out_free_rsp;
1127
1128 vneg_out:
1129 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1130 out_free_rsp:
1131 kfree(pneg_rsp);
1132 out_free_inbuf:
1133 kfree(pneg_inbuf);
1134 return rc;
1135 }
1136
1137 enum securityEnum
smb2_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1138 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1139 {
1140 switch (requested) {
1141 case Kerberos:
1142 case RawNTLMSSP:
1143 return requested;
1144 case NTLMv2:
1145 return RawNTLMSSP;
1146 case Unspecified:
1147 if (server->sec_ntlmssp &&
1148 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1149 return RawNTLMSSP;
1150 if ((server->sec_kerberos || server->sec_mskerberos) &&
1151 (global_secflags & CIFSSEC_MAY_KRB5))
1152 return Kerberos;
1153 fallthrough;
1154 default:
1155 return Unspecified;
1156 }
1157 }
1158
1159 struct SMB2_sess_data {
1160 unsigned int xid;
1161 struct cifs_ses *ses;
1162 struct nls_table *nls_cp;
1163 void (*func)(struct SMB2_sess_data *);
1164 int result;
1165 u64 previous_session;
1166
1167 /* we will send the SMB in three pieces:
1168 * a fixed length beginning part, an optional
1169 * SPNEGO blob (which can be zero length), and a
1170 * last part which will include the strings
1171 * and rest of bcc area. This allows us to avoid
1172 * a large buffer 17K allocation
1173 */
1174 int buf0_type;
1175 struct kvec iov[2];
1176 };
1177
1178 static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data * sess_data)1179 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1180 {
1181 int rc;
1182 struct cifs_ses *ses = sess_data->ses;
1183 struct smb2_sess_setup_req *req;
1184 struct TCP_Server_Info *server = cifs_ses_server(ses);
1185 unsigned int total_len;
1186
1187 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1188 (void **) &req,
1189 &total_len);
1190 if (rc)
1191 return rc;
1192
1193 if (sess_data->ses->binding) {
1194 req->sync_hdr.SessionId = sess_data->ses->Suid;
1195 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1196 req->PreviousSessionId = 0;
1197 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1198 } else {
1199 /* First session, not a reauthenticate */
1200 req->sync_hdr.SessionId = 0;
1201 /*
1202 * if reconnect, we need to send previous sess id
1203 * otherwise it is 0
1204 */
1205 req->PreviousSessionId = sess_data->previous_session;
1206 req->Flags = 0; /* MBZ */
1207 }
1208
1209 /* enough to enable echos and oplocks and one max size write */
1210 req->sync_hdr.CreditRequest = cpu_to_le16(130);
1211
1212 /* only one of SMB2 signing flags may be set in SMB2 request */
1213 if (server->sign)
1214 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1215 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1216 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1217 else
1218 req->SecurityMode = 0;
1219
1220 #ifdef CONFIG_CIFS_DFS_UPCALL
1221 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1222 #else
1223 req->Capabilities = 0;
1224 #endif /* DFS_UPCALL */
1225
1226 req->Channel = 0; /* MBZ */
1227
1228 sess_data->iov[0].iov_base = (char *)req;
1229 /* 1 for pad */
1230 sess_data->iov[0].iov_len = total_len - 1;
1231 /*
1232 * This variable will be used to clear the buffer
1233 * allocated above in case of any error in the calling function.
1234 */
1235 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1236
1237 return 0;
1238 }
1239
1240 static void
SMB2_sess_free_buffer(struct SMB2_sess_data * sess_data)1241 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1242 {
1243 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1244 sess_data->buf0_type = CIFS_NO_BUFFER;
1245 }
1246
1247 static int
SMB2_sess_sendreceive(struct SMB2_sess_data * sess_data)1248 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1249 {
1250 int rc;
1251 struct smb_rqst rqst;
1252 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1253 struct kvec rsp_iov = { NULL, 0 };
1254
1255 /* Testing shows that buffer offset must be at location of Buffer[0] */
1256 req->SecurityBufferOffset =
1257 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1258 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1259
1260 memset(&rqst, 0, sizeof(struct smb_rqst));
1261 rqst.rq_iov = sess_data->iov;
1262 rqst.rq_nvec = 2;
1263
1264 /* BB add code to build os and lm fields */
1265 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1266 cifs_ses_server(sess_data->ses),
1267 &rqst,
1268 &sess_data->buf0_type,
1269 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1270 cifs_small_buf_release(sess_data->iov[0].iov_base);
1271 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1272
1273 return rc;
1274 }
1275
1276 static int
SMB2_sess_establish_session(struct SMB2_sess_data * sess_data)1277 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1278 {
1279 int rc = 0;
1280 struct cifs_ses *ses = sess_data->ses;
1281 struct TCP_Server_Info *server = cifs_ses_server(ses);
1282
1283 mutex_lock(&server->srv_mutex);
1284 if (server->ops->generate_signingkey) {
1285 rc = server->ops->generate_signingkey(ses);
1286 if (rc) {
1287 cifs_dbg(FYI,
1288 "SMB3 session key generation failed\n");
1289 mutex_unlock(&server->srv_mutex);
1290 return rc;
1291 }
1292 }
1293 if (!server->session_estab) {
1294 server->sequence_number = 0x2;
1295 server->session_estab = true;
1296 }
1297 mutex_unlock(&server->srv_mutex);
1298
1299 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1300 /* keep existing ses state if binding */
1301 if (!ses->binding) {
1302 spin_lock(&GlobalMid_Lock);
1303 ses->status = CifsGood;
1304 ses->need_reconnect = false;
1305 spin_unlock(&GlobalMid_Lock);
1306 }
1307
1308 return rc;
1309 }
1310
1311 #ifdef CONFIG_CIFS_UPCALL
1312 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1313 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1314 {
1315 int rc;
1316 struct cifs_ses *ses = sess_data->ses;
1317 struct cifs_spnego_msg *msg;
1318 struct key *spnego_key = NULL;
1319 struct smb2_sess_setup_rsp *rsp = NULL;
1320
1321 rc = SMB2_sess_alloc_buffer(sess_data);
1322 if (rc)
1323 goto out;
1324
1325 spnego_key = cifs_get_spnego_key(ses);
1326 if (IS_ERR(spnego_key)) {
1327 rc = PTR_ERR(spnego_key);
1328 if (rc == -ENOKEY)
1329 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1330 spnego_key = NULL;
1331 goto out;
1332 }
1333
1334 msg = spnego_key->payload.data[0];
1335 /*
1336 * check version field to make sure that cifs.upcall is
1337 * sending us a response in an expected form
1338 */
1339 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1340 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1341 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1342 rc = -EKEYREJECTED;
1343 goto out_put_spnego_key;
1344 }
1345
1346 /* keep session key if binding */
1347 if (!ses->binding) {
1348 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1349 GFP_KERNEL);
1350 if (!ses->auth_key.response) {
1351 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1352 msg->sesskey_len);
1353 rc = -ENOMEM;
1354 goto out_put_spnego_key;
1355 }
1356 ses->auth_key.len = msg->sesskey_len;
1357 }
1358
1359 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1360 sess_data->iov[1].iov_len = msg->secblob_len;
1361
1362 rc = SMB2_sess_sendreceive(sess_data);
1363 if (rc)
1364 goto out_put_spnego_key;
1365
1366 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1367 /* keep session id and flags if binding */
1368 if (!ses->binding) {
1369 ses->Suid = rsp->sync_hdr.SessionId;
1370 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1371 }
1372
1373 rc = SMB2_sess_establish_session(sess_data);
1374 out_put_spnego_key:
1375 key_invalidate(spnego_key);
1376 key_put(spnego_key);
1377 out:
1378 sess_data->result = rc;
1379 sess_data->func = NULL;
1380 SMB2_sess_free_buffer(sess_data);
1381 }
1382 #else
1383 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1384 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1385 {
1386 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1387 sess_data->result = -EOPNOTSUPP;
1388 sess_data->func = NULL;
1389 }
1390 #endif
1391
1392 static void
1393 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1394
1395 static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data * sess_data)1396 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1397 {
1398 int rc;
1399 struct cifs_ses *ses = sess_data->ses;
1400 struct smb2_sess_setup_rsp *rsp = NULL;
1401 char *ntlmssp_blob = NULL;
1402 bool use_spnego = false; /* else use raw ntlmssp */
1403 u16 blob_length = 0;
1404
1405 /*
1406 * If memory allocation is successful, caller of this function
1407 * frees it.
1408 */
1409 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1410 if (!ses->ntlmssp) {
1411 rc = -ENOMEM;
1412 goto out_err;
1413 }
1414 ses->ntlmssp->sesskey_per_smbsess = true;
1415
1416 rc = SMB2_sess_alloc_buffer(sess_data);
1417 if (rc)
1418 goto out_err;
1419
1420 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1421 GFP_KERNEL);
1422 if (ntlmssp_blob == NULL) {
1423 rc = -ENOMEM;
1424 goto out;
1425 }
1426
1427 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1428 if (use_spnego) {
1429 /* BB eventually need to add this */
1430 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1431 rc = -EOPNOTSUPP;
1432 goto out;
1433 } else {
1434 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1435 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1436 }
1437 sess_data->iov[1].iov_base = ntlmssp_blob;
1438 sess_data->iov[1].iov_len = blob_length;
1439
1440 rc = SMB2_sess_sendreceive(sess_data);
1441 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1442
1443 /* If true, rc here is expected and not an error */
1444 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1445 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1446 rc = 0;
1447
1448 if (rc)
1449 goto out;
1450
1451 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1452 le16_to_cpu(rsp->SecurityBufferOffset)) {
1453 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1454 le16_to_cpu(rsp->SecurityBufferOffset));
1455 rc = -EIO;
1456 goto out;
1457 }
1458 rc = decode_ntlmssp_challenge(rsp->Buffer,
1459 le16_to_cpu(rsp->SecurityBufferLength), ses);
1460 if (rc)
1461 goto out;
1462
1463 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1464
1465 /* keep existing ses id and flags if binding */
1466 if (!ses->binding) {
1467 ses->Suid = rsp->sync_hdr.SessionId;
1468 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1469 }
1470
1471 out:
1472 kfree(ntlmssp_blob);
1473 SMB2_sess_free_buffer(sess_data);
1474 if (!rc) {
1475 sess_data->result = 0;
1476 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1477 return;
1478 }
1479 out_err:
1480 kfree(ses->ntlmssp);
1481 ses->ntlmssp = NULL;
1482 sess_data->result = rc;
1483 sess_data->func = NULL;
1484 }
1485
1486 static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data * sess_data)1487 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1488 {
1489 int rc;
1490 struct cifs_ses *ses = sess_data->ses;
1491 struct smb2_sess_setup_req *req;
1492 struct smb2_sess_setup_rsp *rsp = NULL;
1493 unsigned char *ntlmssp_blob = NULL;
1494 bool use_spnego = false; /* else use raw ntlmssp */
1495 u16 blob_length = 0;
1496
1497 rc = SMB2_sess_alloc_buffer(sess_data);
1498 if (rc)
1499 goto out;
1500
1501 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1502 req->sync_hdr.SessionId = ses->Suid;
1503
1504 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1505 sess_data->nls_cp);
1506 if (rc) {
1507 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1508 goto out;
1509 }
1510
1511 if (use_spnego) {
1512 /* BB eventually need to add this */
1513 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1514 rc = -EOPNOTSUPP;
1515 goto out;
1516 }
1517 sess_data->iov[1].iov_base = ntlmssp_blob;
1518 sess_data->iov[1].iov_len = blob_length;
1519
1520 rc = SMB2_sess_sendreceive(sess_data);
1521 if (rc)
1522 goto out;
1523
1524 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1525
1526 /* keep existing ses id and flags if binding */
1527 if (!ses->binding) {
1528 ses->Suid = rsp->sync_hdr.SessionId;
1529 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1530 }
1531
1532 rc = SMB2_sess_establish_session(sess_data);
1533 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1534 if (ses->server->dialect < SMB30_PROT_ID) {
1535 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1536 /*
1537 * The session id is opaque in terms of endianness, so we can't
1538 * print it as a long long. we dump it as we got it on the wire
1539 */
1540 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
1541 &ses->Suid);
1542 cifs_dbg(VFS, "Session Key %*ph\n",
1543 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1544 cifs_dbg(VFS, "Signing Key %*ph\n",
1545 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1546 }
1547 #endif
1548 out:
1549 kfree(ntlmssp_blob);
1550 SMB2_sess_free_buffer(sess_data);
1551 kfree(ses->ntlmssp);
1552 ses->ntlmssp = NULL;
1553 sess_data->result = rc;
1554 sess_data->func = NULL;
1555 }
1556
1557 static int
SMB2_select_sec(struct cifs_ses * ses,struct SMB2_sess_data * sess_data)1558 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1559 {
1560 int type;
1561
1562 type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1563 cifs_dbg(FYI, "sess setup type %d\n", type);
1564 if (type == Unspecified) {
1565 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1566 return -EINVAL;
1567 }
1568
1569 switch (type) {
1570 case Kerberos:
1571 sess_data->func = SMB2_auth_kerberos;
1572 break;
1573 case RawNTLMSSP:
1574 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1575 break;
1576 default:
1577 cifs_dbg(VFS, "secType %d not supported!\n", type);
1578 return -EOPNOTSUPP;
1579 }
1580
1581 return 0;
1582 }
1583
1584 int
SMB2_sess_setup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)1585 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1586 const struct nls_table *nls_cp)
1587 {
1588 int rc = 0;
1589 struct TCP_Server_Info *server = cifs_ses_server(ses);
1590 struct SMB2_sess_data *sess_data;
1591
1592 cifs_dbg(FYI, "Session Setup\n");
1593
1594 if (!server) {
1595 WARN(1, "%s: server is NULL!\n", __func__);
1596 return -EIO;
1597 }
1598
1599 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1600 if (!sess_data)
1601 return -ENOMEM;
1602
1603 rc = SMB2_select_sec(ses, sess_data);
1604 if (rc)
1605 goto out;
1606 sess_data->xid = xid;
1607 sess_data->ses = ses;
1608 sess_data->buf0_type = CIFS_NO_BUFFER;
1609 sess_data->nls_cp = (struct nls_table *) nls_cp;
1610 sess_data->previous_session = ses->Suid;
1611
1612 /*
1613 * Initialize the session hash with the server one.
1614 */
1615 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1616 SMB2_PREAUTH_HASH_SIZE);
1617
1618 while (sess_data->func)
1619 sess_data->func(sess_data);
1620
1621 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1622 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1623 rc = sess_data->result;
1624 out:
1625 kfree(sess_data);
1626 return rc;
1627 }
1628
1629 int
SMB2_logoff(const unsigned int xid,struct cifs_ses * ses)1630 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1631 {
1632 struct smb_rqst rqst;
1633 struct smb2_logoff_req *req; /* response is also trivial struct */
1634 int rc = 0;
1635 struct TCP_Server_Info *server;
1636 int flags = 0;
1637 unsigned int total_len;
1638 struct kvec iov[1];
1639 struct kvec rsp_iov;
1640 int resp_buf_type;
1641
1642 cifs_dbg(FYI, "disconnect session %p\n", ses);
1643
1644 if (ses && (ses->server))
1645 server = ses->server;
1646 else
1647 return -EIO;
1648
1649 /* no need to send SMB logoff if uid already closed due to reconnect */
1650 if (ses->need_reconnect)
1651 goto smb2_session_already_dead;
1652
1653 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1654 (void **) &req, &total_len);
1655 if (rc)
1656 return rc;
1657
1658 /* since no tcon, smb2_init can not do this, so do here */
1659 req->sync_hdr.SessionId = ses->Suid;
1660
1661 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1662 flags |= CIFS_TRANSFORM_REQ;
1663 else if (server->sign)
1664 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1665
1666 flags |= CIFS_NO_RSP_BUF;
1667
1668 iov[0].iov_base = (char *)req;
1669 iov[0].iov_len = total_len;
1670
1671 memset(&rqst, 0, sizeof(struct smb_rqst));
1672 rqst.rq_iov = iov;
1673 rqst.rq_nvec = 1;
1674
1675 rc = cifs_send_recv(xid, ses, ses->server,
1676 &rqst, &resp_buf_type, flags, &rsp_iov);
1677 cifs_small_buf_release(req);
1678 /*
1679 * No tcon so can't do
1680 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1681 */
1682
1683 smb2_session_already_dead:
1684 return rc;
1685 }
1686
cifs_stats_fail_inc(struct cifs_tcon * tcon,uint16_t code)1687 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1688 {
1689 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1690 }
1691
1692 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1693
1694 /* These are similar values to what Windows uses */
init_copy_chunk_defaults(struct cifs_tcon * tcon)1695 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1696 {
1697 tcon->max_chunks = 256;
1698 tcon->max_bytes_chunk = 1048576;
1699 tcon->max_bytes_copy = 16777216;
1700 }
1701
1702 int
SMB2_tcon(const unsigned int xid,struct cifs_ses * ses,const char * tree,struct cifs_tcon * tcon,const struct nls_table * cp)1703 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1704 struct cifs_tcon *tcon, const struct nls_table *cp)
1705 {
1706 struct smb_rqst rqst;
1707 struct smb2_tree_connect_req *req;
1708 struct smb2_tree_connect_rsp *rsp = NULL;
1709 struct kvec iov[2];
1710 struct kvec rsp_iov = { NULL, 0 };
1711 int rc = 0;
1712 int resp_buftype;
1713 int unc_path_len;
1714 __le16 *unc_path = NULL;
1715 int flags = 0;
1716 unsigned int total_len;
1717 struct TCP_Server_Info *server;
1718
1719 /* always use master channel */
1720 server = ses->server;
1721
1722 cifs_dbg(FYI, "TCON\n");
1723
1724 if (!server || !tree)
1725 return -EIO;
1726
1727 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1728 if (unc_path == NULL)
1729 return -ENOMEM;
1730
1731 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1732 unc_path_len *= 2;
1733 if (unc_path_len < 2) {
1734 kfree(unc_path);
1735 return -EINVAL;
1736 }
1737
1738 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1739 tcon->tid = 0;
1740 atomic_set(&tcon->num_remote_opens, 0);
1741 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1742 (void **) &req, &total_len);
1743 if (rc) {
1744 kfree(unc_path);
1745 return rc;
1746 }
1747
1748 if (smb3_encryption_required(tcon))
1749 flags |= CIFS_TRANSFORM_REQ;
1750
1751 iov[0].iov_base = (char *)req;
1752 /* 1 for pad */
1753 iov[0].iov_len = total_len - 1;
1754
1755 /* Testing shows that buffer offset must be at location of Buffer[0] */
1756 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1757 - 1 /* pad */);
1758 req->PathLength = cpu_to_le16(unc_path_len - 2);
1759 iov[1].iov_base = unc_path;
1760 iov[1].iov_len = unc_path_len;
1761
1762 /*
1763 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1764 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1765 * (Samba servers don't always set the flag so also check if null user)
1766 */
1767 if ((server->dialect == SMB311_PROT_ID) &&
1768 !smb3_encryption_required(tcon) &&
1769 !(ses->session_flags &
1770 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1771 ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1772 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1773
1774 memset(&rqst, 0, sizeof(struct smb_rqst));
1775 rqst.rq_iov = iov;
1776 rqst.rq_nvec = 2;
1777
1778 /* Need 64 for max size write so ask for more in case not there yet */
1779 req->sync_hdr.CreditRequest = cpu_to_le16(64);
1780
1781 rc = cifs_send_recv(xid, ses, server,
1782 &rqst, &resp_buftype, flags, &rsp_iov);
1783 cifs_small_buf_release(req);
1784 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1785 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1786 if (rc != 0) {
1787 if (tcon) {
1788 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1789 tcon->need_reconnect = true;
1790 }
1791 goto tcon_error_exit;
1792 }
1793
1794 switch (rsp->ShareType) {
1795 case SMB2_SHARE_TYPE_DISK:
1796 cifs_dbg(FYI, "connection to disk share\n");
1797 break;
1798 case SMB2_SHARE_TYPE_PIPE:
1799 tcon->pipe = true;
1800 cifs_dbg(FYI, "connection to pipe share\n");
1801 break;
1802 case SMB2_SHARE_TYPE_PRINT:
1803 tcon->print = true;
1804 cifs_dbg(FYI, "connection to printer\n");
1805 break;
1806 default:
1807 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1808 rc = -EOPNOTSUPP;
1809 goto tcon_error_exit;
1810 }
1811
1812 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1813 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1814 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1815 tcon->tidStatus = CifsGood;
1816 tcon->need_reconnect = false;
1817 tcon->tid = rsp->sync_hdr.TreeId;
1818 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1819
1820 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1821 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1822 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1823
1824 if (tcon->seal &&
1825 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1826 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1827
1828 init_copy_chunk_defaults(tcon);
1829 if (server->ops->validate_negotiate)
1830 rc = server->ops->validate_negotiate(xid, tcon);
1831 tcon_exit:
1832
1833 free_rsp_buf(resp_buftype, rsp);
1834 kfree(unc_path);
1835 return rc;
1836
1837 tcon_error_exit:
1838 if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1839 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1840 }
1841 goto tcon_exit;
1842 }
1843
1844 int
SMB2_tdis(const unsigned int xid,struct cifs_tcon * tcon)1845 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1846 {
1847 struct smb_rqst rqst;
1848 struct smb2_tree_disconnect_req *req; /* response is trivial */
1849 int rc = 0;
1850 struct cifs_ses *ses = tcon->ses;
1851 int flags = 0;
1852 unsigned int total_len;
1853 struct kvec iov[1];
1854 struct kvec rsp_iov;
1855 int resp_buf_type;
1856
1857 cifs_dbg(FYI, "Tree Disconnect\n");
1858
1859 if (!ses || !(ses->server))
1860 return -EIO;
1861
1862 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1863 return 0;
1864
1865 close_cached_dir_lease(&tcon->crfid);
1866
1867 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1868 (void **) &req,
1869 &total_len);
1870 if (rc)
1871 return rc;
1872
1873 if (smb3_encryption_required(tcon))
1874 flags |= CIFS_TRANSFORM_REQ;
1875
1876 flags |= CIFS_NO_RSP_BUF;
1877
1878 iov[0].iov_base = (char *)req;
1879 iov[0].iov_len = total_len;
1880
1881 memset(&rqst, 0, sizeof(struct smb_rqst));
1882 rqst.rq_iov = iov;
1883 rqst.rq_nvec = 1;
1884
1885 rc = cifs_send_recv(xid, ses, ses->server,
1886 &rqst, &resp_buf_type, flags, &rsp_iov);
1887 cifs_small_buf_release(req);
1888 if (rc)
1889 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1890
1891 return rc;
1892 }
1893
1894
1895 static struct create_durable *
create_durable_buf(void)1896 create_durable_buf(void)
1897 {
1898 struct create_durable *buf;
1899
1900 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1901 if (!buf)
1902 return NULL;
1903
1904 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1905 (struct create_durable, Data));
1906 buf->ccontext.DataLength = cpu_to_le32(16);
1907 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1908 (struct create_durable, Name));
1909 buf->ccontext.NameLength = cpu_to_le16(4);
1910 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1911 buf->Name[0] = 'D';
1912 buf->Name[1] = 'H';
1913 buf->Name[2] = 'n';
1914 buf->Name[3] = 'Q';
1915 return buf;
1916 }
1917
1918 static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid * fid)1919 create_reconnect_durable_buf(struct cifs_fid *fid)
1920 {
1921 struct create_durable *buf;
1922
1923 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1924 if (!buf)
1925 return NULL;
1926
1927 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1928 (struct create_durable, Data));
1929 buf->ccontext.DataLength = cpu_to_le32(16);
1930 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1931 (struct create_durable, Name));
1932 buf->ccontext.NameLength = cpu_to_le16(4);
1933 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1934 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1935 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1936 buf->Name[0] = 'D';
1937 buf->Name[1] = 'H';
1938 buf->Name[2] = 'n';
1939 buf->Name[3] = 'C';
1940 return buf;
1941 }
1942
1943 static void
parse_query_id_ctxt(struct create_context * cc,struct smb2_file_all_info * buf)1944 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1945 {
1946 struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1947
1948 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1949 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1950 buf->IndexNumber = pdisk_id->DiskFileId;
1951 }
1952
1953 static void
parse_posix_ctxt(struct create_context * cc,struct smb2_file_all_info * info,struct create_posix_rsp * posix)1954 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1955 struct create_posix_rsp *posix)
1956 {
1957 int sid_len;
1958 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1959 u8 *end = beg + le32_to_cpu(cc->DataLength);
1960 u8 *sid;
1961
1962 memset(posix, 0, sizeof(*posix));
1963
1964 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1965 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1966 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1967
1968 sid = beg + 12;
1969 sid_len = posix_info_sid_size(sid, end);
1970 if (sid_len < 0) {
1971 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1972 return;
1973 }
1974 memcpy(&posix->owner, sid, sid_len);
1975
1976 sid = sid + sid_len;
1977 sid_len = posix_info_sid_size(sid, end);
1978 if (sid_len < 0) {
1979 cifs_dbg(VFS, "bad group sid in posix create response\n");
1980 return;
1981 }
1982 memcpy(&posix->group, sid, sid_len);
1983
1984 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1985 posix->nlink, posix->mode, posix->reparse_tag);
1986 }
1987
1988 void
smb2_parse_contexts(struct TCP_Server_Info * server,struct smb2_create_rsp * rsp,unsigned int * epoch,char * lease_key,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix)1989 smb2_parse_contexts(struct TCP_Server_Info *server,
1990 struct smb2_create_rsp *rsp,
1991 unsigned int *epoch, char *lease_key, __u8 *oplock,
1992 struct smb2_file_all_info *buf,
1993 struct create_posix_rsp *posix)
1994 {
1995 char *data_offset;
1996 struct create_context *cc;
1997 unsigned int next;
1998 unsigned int remaining;
1999 char *name;
2000 static const char smb3_create_tag_posix[] = {
2001 0x93, 0xAD, 0x25, 0x50, 0x9C,
2002 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2003 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2004 };
2005
2006 *oplock = 0;
2007 data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2008 remaining = le32_to_cpu(rsp->CreateContextsLength);
2009 cc = (struct create_context *)data_offset;
2010
2011 /* Initialize inode number to 0 in case no valid data in qfid context */
2012 if (buf)
2013 buf->IndexNumber = 0;
2014
2015 while (remaining >= sizeof(struct create_context)) {
2016 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2017 if (le16_to_cpu(cc->NameLength) == 4 &&
2018 strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2019 *oplock = server->ops->parse_lease_buf(cc, epoch,
2020 lease_key);
2021 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2022 strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2023 parse_query_id_ctxt(cc, buf);
2024 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2025 if (posix &&
2026 memcmp(name, smb3_create_tag_posix, 16) == 0)
2027 parse_posix_ctxt(cc, buf, posix);
2028 }
2029 /* else {
2030 cifs_dbg(FYI, "Context not matched with len %d\n",
2031 le16_to_cpu(cc->NameLength));
2032 cifs_dump_mem("Cctxt name: ", name, 4);
2033 } */
2034
2035 next = le32_to_cpu(cc->Next);
2036 if (!next)
2037 break;
2038 remaining -= next;
2039 cc = (struct create_context *)((char *)cc + next);
2040 }
2041
2042 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2043 *oplock = rsp->OplockLevel;
2044
2045 return;
2046 }
2047
2048 static int
add_lease_context(struct TCP_Server_Info * server,struct kvec * iov,unsigned int * num_iovec,u8 * lease_key,__u8 * oplock)2049 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2050 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2051 {
2052 struct smb2_create_req *req = iov[0].iov_base;
2053 unsigned int num = *num_iovec;
2054
2055 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2056 if (iov[num].iov_base == NULL)
2057 return -ENOMEM;
2058 iov[num].iov_len = server->vals->create_lease_size;
2059 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2060 if (!req->CreateContextsOffset)
2061 req->CreateContextsOffset = cpu_to_le32(
2062 sizeof(struct smb2_create_req) +
2063 iov[num - 1].iov_len);
2064 le32_add_cpu(&req->CreateContextsLength,
2065 server->vals->create_lease_size);
2066 *num_iovec = num + 1;
2067 return 0;
2068 }
2069
2070 static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_open_parms * oparms)2071 create_durable_v2_buf(struct cifs_open_parms *oparms)
2072 {
2073 struct cifs_fid *pfid = oparms->fid;
2074 struct create_durable_v2 *buf;
2075
2076 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2077 if (!buf)
2078 return NULL;
2079
2080 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2081 (struct create_durable_v2, dcontext));
2082 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2083 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2084 (struct create_durable_v2, Name));
2085 buf->ccontext.NameLength = cpu_to_le16(4);
2086
2087 /*
2088 * NB: Handle timeout defaults to 0, which allows server to choose
2089 * (most servers default to 120 seconds) and most clients default to 0.
2090 * This can be overridden at mount ("handletimeout=") if the user wants
2091 * a different persistent (or resilient) handle timeout for all opens
2092 * opens on a particular SMB3 mount.
2093 */
2094 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2095 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2096 generate_random_uuid(buf->dcontext.CreateGuid);
2097 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2098
2099 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2100 buf->Name[0] = 'D';
2101 buf->Name[1] = 'H';
2102 buf->Name[2] = '2';
2103 buf->Name[3] = 'Q';
2104 return buf;
2105 }
2106
2107 static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid * fid)2108 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2109 {
2110 struct create_durable_handle_reconnect_v2 *buf;
2111
2112 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2113 GFP_KERNEL);
2114 if (!buf)
2115 return NULL;
2116
2117 buf->ccontext.DataOffset =
2118 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2119 dcontext));
2120 buf->ccontext.DataLength =
2121 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2122 buf->ccontext.NameOffset =
2123 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2124 Name));
2125 buf->ccontext.NameLength = cpu_to_le16(4);
2126
2127 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2128 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2129 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2130 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2131
2132 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2133 buf->Name[0] = 'D';
2134 buf->Name[1] = 'H';
2135 buf->Name[2] = '2';
2136 buf->Name[3] = 'C';
2137 return buf;
2138 }
2139
2140 static int
add_durable_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2141 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2142 struct cifs_open_parms *oparms)
2143 {
2144 struct smb2_create_req *req = iov[0].iov_base;
2145 unsigned int num = *num_iovec;
2146
2147 iov[num].iov_base = create_durable_v2_buf(oparms);
2148 if (iov[num].iov_base == NULL)
2149 return -ENOMEM;
2150 iov[num].iov_len = sizeof(struct create_durable_v2);
2151 if (!req->CreateContextsOffset)
2152 req->CreateContextsOffset =
2153 cpu_to_le32(sizeof(struct smb2_create_req) +
2154 iov[1].iov_len);
2155 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2156 *num_iovec = num + 1;
2157 return 0;
2158 }
2159
2160 static int
add_durable_reconnect_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2161 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2162 struct cifs_open_parms *oparms)
2163 {
2164 struct smb2_create_req *req = iov[0].iov_base;
2165 unsigned int num = *num_iovec;
2166
2167 /* indicate that we don't need to relock the file */
2168 oparms->reconnect = false;
2169
2170 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2171 if (iov[num].iov_base == NULL)
2172 return -ENOMEM;
2173 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2174 if (!req->CreateContextsOffset)
2175 req->CreateContextsOffset =
2176 cpu_to_le32(sizeof(struct smb2_create_req) +
2177 iov[1].iov_len);
2178 le32_add_cpu(&req->CreateContextsLength,
2179 sizeof(struct create_durable_handle_reconnect_v2));
2180 *num_iovec = num + 1;
2181 return 0;
2182 }
2183
2184 static int
add_durable_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms,bool use_persistent)2185 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2186 struct cifs_open_parms *oparms, bool use_persistent)
2187 {
2188 struct smb2_create_req *req = iov[0].iov_base;
2189 unsigned int num = *num_iovec;
2190
2191 if (use_persistent) {
2192 if (oparms->reconnect)
2193 return add_durable_reconnect_v2_context(iov, num_iovec,
2194 oparms);
2195 else
2196 return add_durable_v2_context(iov, num_iovec, oparms);
2197 }
2198
2199 if (oparms->reconnect) {
2200 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2201 /* indicate that we don't need to relock the file */
2202 oparms->reconnect = false;
2203 } else
2204 iov[num].iov_base = create_durable_buf();
2205 if (iov[num].iov_base == NULL)
2206 return -ENOMEM;
2207 iov[num].iov_len = sizeof(struct create_durable);
2208 if (!req->CreateContextsOffset)
2209 req->CreateContextsOffset =
2210 cpu_to_le32(sizeof(struct smb2_create_req) +
2211 iov[1].iov_len);
2212 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2213 *num_iovec = num + 1;
2214 return 0;
2215 }
2216
2217 /* See MS-SMB2 2.2.13.2.7 */
2218 static struct crt_twarp_ctxt *
create_twarp_buf(__u64 timewarp)2219 create_twarp_buf(__u64 timewarp)
2220 {
2221 struct crt_twarp_ctxt *buf;
2222
2223 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2224 if (!buf)
2225 return NULL;
2226
2227 buf->ccontext.DataOffset = cpu_to_le16(offsetof
2228 (struct crt_twarp_ctxt, Timestamp));
2229 buf->ccontext.DataLength = cpu_to_le32(8);
2230 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2231 (struct crt_twarp_ctxt, Name));
2232 buf->ccontext.NameLength = cpu_to_le16(4);
2233 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2234 buf->Name[0] = 'T';
2235 buf->Name[1] = 'W';
2236 buf->Name[2] = 'r';
2237 buf->Name[3] = 'p';
2238 buf->Timestamp = cpu_to_le64(timewarp);
2239 return buf;
2240 }
2241
2242 /* See MS-SMB2 2.2.13.2.7 */
2243 static int
add_twarp_context(struct kvec * iov,unsigned int * num_iovec,__u64 timewarp)2244 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2245 {
2246 struct smb2_create_req *req = iov[0].iov_base;
2247 unsigned int num = *num_iovec;
2248
2249 iov[num].iov_base = create_twarp_buf(timewarp);
2250 if (iov[num].iov_base == NULL)
2251 return -ENOMEM;
2252 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2253 if (!req->CreateContextsOffset)
2254 req->CreateContextsOffset = cpu_to_le32(
2255 sizeof(struct smb2_create_req) +
2256 iov[num - 1].iov_len);
2257 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2258 *num_iovec = num + 1;
2259 return 0;
2260 }
2261
2262 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
setup_owner_group_sids(char * buf)2263 static void setup_owner_group_sids(char *buf)
2264 {
2265 struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2266
2267 /* Populate the user ownership fields S-1-5-88-1 */
2268 sids->owner.Revision = 1;
2269 sids->owner.NumAuth = 3;
2270 sids->owner.Authority[5] = 5;
2271 sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2272 sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2273 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2274
2275 /* Populate the group ownership fields S-1-5-88-2 */
2276 sids->group.Revision = 1;
2277 sids->group.NumAuth = 3;
2278 sids->group.Authority[5] = 5;
2279 sids->group.SubAuthorities[0] = cpu_to_le32(88);
2280 sids->group.SubAuthorities[1] = cpu_to_le32(2);
2281 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2282
2283 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2284 }
2285
2286 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2287 static struct crt_sd_ctxt *
create_sd_buf(umode_t mode,bool set_owner,unsigned int * len)2288 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2289 {
2290 struct crt_sd_ctxt *buf;
2291 __u8 *ptr, *aclptr;
2292 unsigned int acelen, acl_size, ace_count;
2293 unsigned int owner_offset = 0;
2294 unsigned int group_offset = 0;
2295 struct smb3_acl acl;
2296
2297 *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2298
2299 if (set_owner) {
2300 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2301 *len += sizeof(struct owner_group_sids);
2302 }
2303
2304 buf = kzalloc(*len, GFP_KERNEL);
2305 if (buf == NULL)
2306 return buf;
2307
2308 ptr = (__u8 *)&buf[1];
2309 if (set_owner) {
2310 /* offset fields are from beginning of security descriptor not of create context */
2311 owner_offset = ptr - (__u8 *)&buf->sd;
2312 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2313 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2314 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2315
2316 setup_owner_group_sids(ptr);
2317 ptr += sizeof(struct owner_group_sids);
2318 } else {
2319 buf->sd.OffsetOwner = 0;
2320 buf->sd.OffsetGroup = 0;
2321 }
2322
2323 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2324 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2325 buf->ccontext.NameLength = cpu_to_le16(4);
2326 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2327 buf->Name[0] = 'S';
2328 buf->Name[1] = 'e';
2329 buf->Name[2] = 'c';
2330 buf->Name[3] = 'D';
2331 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */
2332
2333 /*
2334 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2335 * and "DP" ie the DACL is present
2336 */
2337 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2338
2339 /* offset owner, group and Sbz1 and SACL are all zero */
2340 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2341 /* Ship the ACL for now. we will copy it into buf later. */
2342 aclptr = ptr;
2343 ptr += sizeof(struct cifs_acl);
2344
2345 /* create one ACE to hold the mode embedded in reserved special SID */
2346 acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2347 ptr += acelen;
2348 acl_size = acelen + sizeof(struct smb3_acl);
2349 ace_count = 1;
2350
2351 if (set_owner) {
2352 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2353 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2354 ptr += acelen;
2355 acl_size += acelen;
2356 ace_count += 1;
2357 }
2358
2359 /* and one more ACE to allow access for authenticated users */
2360 acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2361 ptr += acelen;
2362 acl_size += acelen;
2363 ace_count += 1;
2364
2365 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2366 acl.AclSize = cpu_to_le16(acl_size);
2367 acl.AceCount = cpu_to_le16(ace_count);
2368 memcpy(aclptr, &acl, sizeof(struct cifs_acl));
2369
2370 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2371 *len = ptr - (__u8 *)buf;
2372
2373 return buf;
2374 }
2375
2376 static int
add_sd_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode,bool set_owner)2377 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2378 {
2379 struct smb2_create_req *req = iov[0].iov_base;
2380 unsigned int num = *num_iovec;
2381 unsigned int len = 0;
2382
2383 iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2384 if (iov[num].iov_base == NULL)
2385 return -ENOMEM;
2386 iov[num].iov_len = len;
2387 if (!req->CreateContextsOffset)
2388 req->CreateContextsOffset = cpu_to_le32(
2389 sizeof(struct smb2_create_req) +
2390 iov[num - 1].iov_len);
2391 le32_add_cpu(&req->CreateContextsLength, len);
2392 *num_iovec = num + 1;
2393 return 0;
2394 }
2395
2396 static struct crt_query_id_ctxt *
create_query_id_buf(void)2397 create_query_id_buf(void)
2398 {
2399 struct crt_query_id_ctxt *buf;
2400
2401 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2402 if (!buf)
2403 return NULL;
2404
2405 buf->ccontext.DataOffset = cpu_to_le16(0);
2406 buf->ccontext.DataLength = cpu_to_le32(0);
2407 buf->ccontext.NameOffset = cpu_to_le16(offsetof
2408 (struct crt_query_id_ctxt, Name));
2409 buf->ccontext.NameLength = cpu_to_le16(4);
2410 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2411 buf->Name[0] = 'Q';
2412 buf->Name[1] = 'F';
2413 buf->Name[2] = 'i';
2414 buf->Name[3] = 'd';
2415 return buf;
2416 }
2417
2418 /* See MS-SMB2 2.2.13.2.9 */
2419 static int
add_query_id_context(struct kvec * iov,unsigned int * num_iovec)2420 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2421 {
2422 struct smb2_create_req *req = iov[0].iov_base;
2423 unsigned int num = *num_iovec;
2424
2425 iov[num].iov_base = create_query_id_buf();
2426 if (iov[num].iov_base == NULL)
2427 return -ENOMEM;
2428 iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2429 if (!req->CreateContextsOffset)
2430 req->CreateContextsOffset = cpu_to_le32(
2431 sizeof(struct smb2_create_req) +
2432 iov[num - 1].iov_len);
2433 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2434 *num_iovec = num + 1;
2435 return 0;
2436 }
2437
2438 static int
alloc_path_with_tree_prefix(__le16 ** out_path,int * out_size,int * out_len,const char * treename,const __le16 * path)2439 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2440 const char *treename, const __le16 *path)
2441 {
2442 int treename_len, path_len;
2443 struct nls_table *cp;
2444 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2445
2446 /*
2447 * skip leading "\\"
2448 */
2449 treename_len = strlen(treename);
2450 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2451 return -EINVAL;
2452
2453 treename += 2;
2454 treename_len -= 2;
2455
2456 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2457
2458 /*
2459 * make room for one path separator between the treename and
2460 * path
2461 */
2462 *out_len = treename_len + 1 + path_len;
2463
2464 /*
2465 * final path needs to be null-terminated UTF16 with a
2466 * size aligned to 8
2467 */
2468
2469 *out_size = roundup((*out_len+1)*2, 8);
2470 *out_path = kzalloc(*out_size, GFP_KERNEL);
2471 if (!*out_path)
2472 return -ENOMEM;
2473
2474 cp = load_nls_default();
2475 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2476 UniStrcat(*out_path, sep);
2477 UniStrcat(*out_path, path);
2478 unload_nls(cp);
2479
2480 return 0;
2481 }
2482
smb311_posix_mkdir(const unsigned int xid,struct inode * inode,umode_t mode,struct cifs_tcon * tcon,const char * full_path,struct cifs_sb_info * cifs_sb)2483 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2484 umode_t mode, struct cifs_tcon *tcon,
2485 const char *full_path,
2486 struct cifs_sb_info *cifs_sb)
2487 {
2488 struct smb_rqst rqst;
2489 struct smb2_create_req *req;
2490 struct smb2_create_rsp *rsp = NULL;
2491 struct cifs_ses *ses = tcon->ses;
2492 struct kvec iov[3]; /* make sure at least one for each open context */
2493 struct kvec rsp_iov = {NULL, 0};
2494 int resp_buftype;
2495 int uni_path_len;
2496 __le16 *copy_path = NULL;
2497 int copy_size;
2498 int rc = 0;
2499 unsigned int n_iov = 2;
2500 __u32 file_attributes = 0;
2501 char *pc_buf = NULL;
2502 int flags = 0;
2503 unsigned int total_len;
2504 __le16 *utf16_path = NULL;
2505 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2506
2507 cifs_dbg(FYI, "mkdir\n");
2508
2509 /* resource #1: path allocation */
2510 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2511 if (!utf16_path)
2512 return -ENOMEM;
2513
2514 if (!ses || !server) {
2515 rc = -EIO;
2516 goto err_free_path;
2517 }
2518
2519 /* resource #2: request */
2520 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2521 (void **) &req, &total_len);
2522 if (rc)
2523 goto err_free_path;
2524
2525
2526 if (smb3_encryption_required(tcon))
2527 flags |= CIFS_TRANSFORM_REQ;
2528
2529 req->ImpersonationLevel = IL_IMPERSONATION;
2530 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2531 /* File attributes ignored on open (used in create though) */
2532 req->FileAttributes = cpu_to_le32(file_attributes);
2533 req->ShareAccess = FILE_SHARE_ALL_LE;
2534 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2535 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2536
2537 iov[0].iov_base = (char *)req;
2538 /* -1 since last byte is buf[0] which is sent below (path) */
2539 iov[0].iov_len = total_len - 1;
2540
2541 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2542
2543 /* [MS-SMB2] 2.2.13 NameOffset:
2544 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2545 * the SMB2 header, the file name includes a prefix that will
2546 * be processed during DFS name normalization as specified in
2547 * section 3.3.5.9. Otherwise, the file name is relative to
2548 * the share that is identified by the TreeId in the SMB2
2549 * header.
2550 */
2551 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2552 int name_len;
2553
2554 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2555 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2556 &name_len,
2557 tcon->treeName, utf16_path);
2558 if (rc)
2559 goto err_free_req;
2560
2561 req->NameLength = cpu_to_le16(name_len * 2);
2562 uni_path_len = copy_size;
2563 /* free before overwriting resource */
2564 kfree(utf16_path);
2565 utf16_path = copy_path;
2566 } else {
2567 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2568 /* MUST set path len (NameLength) to 0 opening root of share */
2569 req->NameLength = cpu_to_le16(uni_path_len - 2);
2570 if (uni_path_len % 8 != 0) {
2571 copy_size = roundup(uni_path_len, 8);
2572 copy_path = kzalloc(copy_size, GFP_KERNEL);
2573 if (!copy_path) {
2574 rc = -ENOMEM;
2575 goto err_free_req;
2576 }
2577 memcpy((char *)copy_path, (const char *)utf16_path,
2578 uni_path_len);
2579 uni_path_len = copy_size;
2580 /* free before overwriting resource */
2581 kfree(utf16_path);
2582 utf16_path = copy_path;
2583 }
2584 }
2585
2586 iov[1].iov_len = uni_path_len;
2587 iov[1].iov_base = utf16_path;
2588 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2589
2590 if (tcon->posix_extensions) {
2591 /* resource #3: posix buf */
2592 rc = add_posix_context(iov, &n_iov, mode);
2593 if (rc)
2594 goto err_free_req;
2595 pc_buf = iov[n_iov-1].iov_base;
2596 }
2597
2598
2599 memset(&rqst, 0, sizeof(struct smb_rqst));
2600 rqst.rq_iov = iov;
2601 rqst.rq_nvec = n_iov;
2602
2603 /* no need to inc num_remote_opens because we close it just below */
2604 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2605 FILE_WRITE_ATTRIBUTES);
2606 /* resource #4: response buffer */
2607 rc = cifs_send_recv(xid, ses, server,
2608 &rqst, &resp_buftype, flags, &rsp_iov);
2609 if (rc) {
2610 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2611 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2612 CREATE_NOT_FILE,
2613 FILE_WRITE_ATTRIBUTES, rc);
2614 goto err_free_rsp_buf;
2615 }
2616
2617 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2618 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2619 ses->Suid, CREATE_NOT_FILE,
2620 FILE_WRITE_ATTRIBUTES);
2621
2622 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2623
2624 /* Eventually save off posix specific response info and timestaps */
2625
2626 err_free_rsp_buf:
2627 free_rsp_buf(resp_buftype, rsp);
2628 kfree(pc_buf);
2629 err_free_req:
2630 cifs_small_buf_release(req);
2631 err_free_path:
2632 kfree(utf16_path);
2633 return rc;
2634 }
2635
2636 int
SMB2_open_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,__u8 * oplock,struct cifs_open_parms * oparms,__le16 * path)2637 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2638 struct smb_rqst *rqst, __u8 *oplock,
2639 struct cifs_open_parms *oparms, __le16 *path)
2640 {
2641 struct smb2_create_req *req;
2642 unsigned int n_iov = 2;
2643 __u32 file_attributes = 0;
2644 int copy_size;
2645 int uni_path_len;
2646 unsigned int total_len;
2647 struct kvec *iov = rqst->rq_iov;
2648 __le16 *copy_path;
2649 int rc;
2650
2651 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2652 (void **) &req, &total_len);
2653 if (rc)
2654 return rc;
2655
2656 iov[0].iov_base = (char *)req;
2657 /* -1 since last byte is buf[0] which is sent below (path) */
2658 iov[0].iov_len = total_len - 1;
2659
2660 if (oparms->create_options & CREATE_OPTION_READONLY)
2661 file_attributes |= ATTR_READONLY;
2662 if (oparms->create_options & CREATE_OPTION_SPECIAL)
2663 file_attributes |= ATTR_SYSTEM;
2664
2665 req->ImpersonationLevel = IL_IMPERSONATION;
2666 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2667 /* File attributes ignored on open (used in create though) */
2668 req->FileAttributes = cpu_to_le32(file_attributes);
2669 req->ShareAccess = FILE_SHARE_ALL_LE;
2670
2671 req->CreateDisposition = cpu_to_le32(oparms->disposition);
2672 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2673 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2674
2675 /* [MS-SMB2] 2.2.13 NameOffset:
2676 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2677 * the SMB2 header, the file name includes a prefix that will
2678 * be processed during DFS name normalization as specified in
2679 * section 3.3.5.9. Otherwise, the file name is relative to
2680 * the share that is identified by the TreeId in the SMB2
2681 * header.
2682 */
2683 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2684 int name_len;
2685
2686 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2687 rc = alloc_path_with_tree_prefix(©_path, ©_size,
2688 &name_len,
2689 tcon->treeName, path);
2690 if (rc)
2691 return rc;
2692 req->NameLength = cpu_to_le16(name_len * 2);
2693 uni_path_len = copy_size;
2694 path = copy_path;
2695 } else {
2696 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2697 /* MUST set path len (NameLength) to 0 opening root of share */
2698 req->NameLength = cpu_to_le16(uni_path_len - 2);
2699 copy_size = uni_path_len;
2700 if (copy_size % 8 != 0)
2701 copy_size = roundup(copy_size, 8);
2702 copy_path = kzalloc(copy_size, GFP_KERNEL);
2703 if (!copy_path)
2704 return -ENOMEM;
2705 memcpy((char *)copy_path, (const char *)path,
2706 uni_path_len);
2707 uni_path_len = copy_size;
2708 path = copy_path;
2709 }
2710
2711 iov[1].iov_len = uni_path_len;
2712 iov[1].iov_base = path;
2713
2714 if ((!server->oplocks) || (tcon->no_lease))
2715 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2716
2717 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2718 *oplock == SMB2_OPLOCK_LEVEL_NONE)
2719 req->RequestedOplockLevel = *oplock;
2720 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2721 (oparms->create_options & CREATE_NOT_FILE))
2722 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2723 else {
2724 rc = add_lease_context(server, iov, &n_iov,
2725 oparms->fid->lease_key, oplock);
2726 if (rc)
2727 return rc;
2728 }
2729
2730 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2731 /* need to set Next field of lease context if we request it */
2732 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2733 struct create_context *ccontext =
2734 (struct create_context *)iov[n_iov-1].iov_base;
2735 ccontext->Next =
2736 cpu_to_le32(server->vals->create_lease_size);
2737 }
2738
2739 rc = add_durable_context(iov, &n_iov, oparms,
2740 tcon->use_persistent);
2741 if (rc)
2742 return rc;
2743 }
2744
2745 if (tcon->posix_extensions) {
2746 if (n_iov > 2) {
2747 struct create_context *ccontext =
2748 (struct create_context *)iov[n_iov-1].iov_base;
2749 ccontext->Next =
2750 cpu_to_le32(iov[n_iov-1].iov_len);
2751 }
2752
2753 rc = add_posix_context(iov, &n_iov, oparms->mode);
2754 if (rc)
2755 return rc;
2756 }
2757
2758 if (tcon->snapshot_time) {
2759 cifs_dbg(FYI, "adding snapshot context\n");
2760 if (n_iov > 2) {
2761 struct create_context *ccontext =
2762 (struct create_context *)iov[n_iov-1].iov_base;
2763 ccontext->Next =
2764 cpu_to_le32(iov[n_iov-1].iov_len);
2765 }
2766
2767 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2768 if (rc)
2769 return rc;
2770 }
2771
2772 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2773 bool set_mode;
2774 bool set_owner;
2775
2776 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2777 (oparms->mode != ACL_NO_MODE))
2778 set_mode = true;
2779 else {
2780 set_mode = false;
2781 oparms->mode = ACL_NO_MODE;
2782 }
2783
2784 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2785 set_owner = true;
2786 else
2787 set_owner = false;
2788
2789 if (set_owner | set_mode) {
2790 if (n_iov > 2) {
2791 struct create_context *ccontext =
2792 (struct create_context *)iov[n_iov-1].iov_base;
2793 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2794 }
2795
2796 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2797 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2798 if (rc)
2799 return rc;
2800 }
2801 }
2802
2803 if (n_iov > 2) {
2804 struct create_context *ccontext =
2805 (struct create_context *)iov[n_iov-1].iov_base;
2806 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2807 }
2808 add_query_id_context(iov, &n_iov);
2809
2810 rqst->rq_nvec = n_iov;
2811 return 0;
2812 }
2813
2814 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2815 * All other vectors are freed by kfree().
2816 */
2817 void
SMB2_open_free(struct smb_rqst * rqst)2818 SMB2_open_free(struct smb_rqst *rqst)
2819 {
2820 int i;
2821
2822 if (rqst && rqst->rq_iov) {
2823 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2824 for (i = 1; i < rqst->rq_nvec; i++)
2825 if (rqst->rq_iov[i].iov_base != smb2_padding)
2826 kfree(rqst->rq_iov[i].iov_base);
2827 }
2828 }
2829
2830 int
SMB2_open(const unsigned int xid,struct cifs_open_parms * oparms,__le16 * path,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix,struct kvec * err_iov,int * buftype)2831 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2832 __u8 *oplock, struct smb2_file_all_info *buf,
2833 struct create_posix_rsp *posix,
2834 struct kvec *err_iov, int *buftype)
2835 {
2836 struct smb_rqst rqst;
2837 struct smb2_create_rsp *rsp = NULL;
2838 struct cifs_tcon *tcon = oparms->tcon;
2839 struct cifs_ses *ses = tcon->ses;
2840 struct TCP_Server_Info *server = cifs_pick_channel(ses);
2841 struct kvec iov[SMB2_CREATE_IOV_SIZE];
2842 struct kvec rsp_iov = {NULL, 0};
2843 int resp_buftype = CIFS_NO_BUFFER;
2844 int rc = 0;
2845 int flags = 0;
2846
2847 cifs_dbg(FYI, "create/open\n");
2848 if (!ses || !server)
2849 return -EIO;
2850
2851 if (smb3_encryption_required(tcon))
2852 flags |= CIFS_TRANSFORM_REQ;
2853
2854 memset(&rqst, 0, sizeof(struct smb_rqst));
2855 memset(&iov, 0, sizeof(iov));
2856 rqst.rq_iov = iov;
2857 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2858
2859 rc = SMB2_open_init(tcon, server,
2860 &rqst, oplock, oparms, path);
2861 if (rc)
2862 goto creat_exit;
2863
2864 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2865 oparms->create_options, oparms->desired_access);
2866
2867 rc = cifs_send_recv(xid, ses, server,
2868 &rqst, &resp_buftype, flags,
2869 &rsp_iov);
2870 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2871
2872 if (rc != 0) {
2873 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2874 if (err_iov && rsp) {
2875 *err_iov = rsp_iov;
2876 *buftype = resp_buftype;
2877 resp_buftype = CIFS_NO_BUFFER;
2878 rsp = NULL;
2879 }
2880 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2881 oparms->create_options, oparms->desired_access, rc);
2882 if (rc == -EREMCHG) {
2883 pr_warn_once("server share %s deleted\n",
2884 tcon->treeName);
2885 tcon->need_reconnect = true;
2886 }
2887 goto creat_exit;
2888 } else
2889 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2890 ses->Suid, oparms->create_options,
2891 oparms->desired_access);
2892
2893 atomic_inc(&tcon->num_remote_opens);
2894 oparms->fid->persistent_fid = rsp->PersistentFileId;
2895 oparms->fid->volatile_fid = rsp->VolatileFileId;
2896 oparms->fid->access = oparms->desired_access;
2897 #ifdef CONFIG_CIFS_DEBUG2
2898 oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2899 #endif /* CIFS_DEBUG2 */
2900
2901 if (buf) {
2902 memcpy(buf, &rsp->CreationTime, 32);
2903 buf->AllocationSize = rsp->AllocationSize;
2904 buf->EndOfFile = rsp->EndofFile;
2905 buf->Attributes = rsp->FileAttributes;
2906 buf->NumberOfLinks = cpu_to_le32(1);
2907 buf->DeletePending = 0;
2908 }
2909
2910
2911 smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2912 oparms->fid->lease_key, oplock, buf, posix);
2913 creat_exit:
2914 SMB2_open_free(&rqst);
2915 free_rsp_buf(resp_buftype, rsp);
2916 return rc;
2917 }
2918
2919 int
SMB2_ioctl_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 opcode,bool is_fsctl,char * in_data,u32 indatalen,__u32 max_response_size)2920 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2921 struct smb_rqst *rqst,
2922 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2923 bool is_fsctl, char *in_data, u32 indatalen,
2924 __u32 max_response_size)
2925 {
2926 struct smb2_ioctl_req *req;
2927 struct kvec *iov = rqst->rq_iov;
2928 unsigned int total_len;
2929 int rc;
2930 char *in_data_buf;
2931
2932 rc = smb2_ioctl_req_init(opcode, tcon, server,
2933 (void **) &req, &total_len);
2934 if (rc)
2935 return rc;
2936
2937 if (indatalen) {
2938 /*
2939 * indatalen is usually small at a couple of bytes max, so
2940 * just allocate through generic pool
2941 */
2942 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2943 if (!in_data_buf) {
2944 cifs_small_buf_release(req);
2945 return -ENOMEM;
2946 }
2947 }
2948
2949 req->CtlCode = cpu_to_le32(opcode);
2950 req->PersistentFileId = persistent_fid;
2951 req->VolatileFileId = volatile_fid;
2952
2953 iov[0].iov_base = (char *)req;
2954 /*
2955 * If no input data, the size of ioctl struct in
2956 * protocol spec still includes a 1 byte data buffer,
2957 * but if input data passed to ioctl, we do not
2958 * want to double count this, so we do not send
2959 * the dummy one byte of data in iovec[0] if sending
2960 * input data (in iovec[1]).
2961 */
2962 if (indatalen) {
2963 req->InputCount = cpu_to_le32(indatalen);
2964 /* do not set InputOffset if no input data */
2965 req->InputOffset =
2966 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2967 rqst->rq_nvec = 2;
2968 iov[0].iov_len = total_len - 1;
2969 iov[1].iov_base = in_data_buf;
2970 iov[1].iov_len = indatalen;
2971 } else {
2972 rqst->rq_nvec = 1;
2973 iov[0].iov_len = total_len;
2974 }
2975
2976 req->OutputOffset = 0;
2977 req->OutputCount = 0; /* MBZ */
2978
2979 /*
2980 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2981 * We Could increase default MaxOutputResponse, but that could require
2982 * more credits. Windows typically sets this smaller, but for some
2983 * ioctls it may be useful to allow server to send more. No point
2984 * limiting what the server can send as long as fits in one credit
2985 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2986 * to increase this limit up in the future.
2987 * Note that for snapshot queries that servers like Azure expect that
2988 * the first query be minimal size (and just used to get the number/size
2989 * of previous versions) so response size must be specified as EXACTLY
2990 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2991 * of eight bytes. Currently that is the only case where we set max
2992 * response size smaller.
2993 */
2994 req->MaxOutputResponse = cpu_to_le32(max_response_size);
2995 req->sync_hdr.CreditCharge =
2996 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2997 SMB2_MAX_BUFFER_SIZE));
2998 if (is_fsctl)
2999 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3000 else
3001 req->Flags = 0;
3002
3003 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3004 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3005 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3006
3007 return 0;
3008 }
3009
3010 void
SMB2_ioctl_free(struct smb_rqst * rqst)3011 SMB2_ioctl_free(struct smb_rqst *rqst)
3012 {
3013 int i;
3014 if (rqst && rqst->rq_iov) {
3015 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3016 for (i = 1; i < rqst->rq_nvec; i++)
3017 if (rqst->rq_iov[i].iov_base != smb2_padding)
3018 kfree(rqst->rq_iov[i].iov_base);
3019 }
3020 }
3021
3022
3023 /*
3024 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
3025 */
3026 int
SMB2_ioctl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 opcode,bool is_fsctl,char * in_data,u32 indatalen,u32 max_out_data_len,char ** out_data,u32 * plen)3027 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3028 u64 volatile_fid, u32 opcode, bool is_fsctl,
3029 char *in_data, u32 indatalen, u32 max_out_data_len,
3030 char **out_data, u32 *plen /* returned data len */)
3031 {
3032 struct smb_rqst rqst;
3033 struct smb2_ioctl_rsp *rsp = NULL;
3034 struct cifs_ses *ses;
3035 struct TCP_Server_Info *server;
3036 struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3037 struct kvec rsp_iov = {NULL, 0};
3038 int resp_buftype = CIFS_NO_BUFFER;
3039 int rc = 0;
3040 int flags = 0;
3041
3042 cifs_dbg(FYI, "SMB2 IOCTL\n");
3043
3044 if (out_data != NULL)
3045 *out_data = NULL;
3046
3047 /* zero out returned data len, in case of error */
3048 if (plen)
3049 *plen = 0;
3050
3051 if (!tcon)
3052 return -EIO;
3053
3054 ses = tcon->ses;
3055 if (!ses)
3056 return -EIO;
3057
3058 server = cifs_pick_channel(ses);
3059 if (!server)
3060 return -EIO;
3061
3062 if (smb3_encryption_required(tcon))
3063 flags |= CIFS_TRANSFORM_REQ;
3064
3065 memset(&rqst, 0, sizeof(struct smb_rqst));
3066 memset(&iov, 0, sizeof(iov));
3067 rqst.rq_iov = iov;
3068 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3069
3070 rc = SMB2_ioctl_init(tcon, server,
3071 &rqst, persistent_fid, volatile_fid, opcode,
3072 is_fsctl, in_data, indatalen, max_out_data_len);
3073 if (rc)
3074 goto ioctl_exit;
3075
3076 rc = cifs_send_recv(xid, ses, server,
3077 &rqst, &resp_buftype, flags,
3078 &rsp_iov);
3079 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3080
3081 if (rc != 0)
3082 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3083 ses->Suid, 0, opcode, rc);
3084
3085 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3086 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3087 goto ioctl_exit;
3088 } else if (rc == -EINVAL) {
3089 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3090 (opcode != FSCTL_SRV_COPYCHUNK)) {
3091 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3092 goto ioctl_exit;
3093 }
3094 } else if (rc == -E2BIG) {
3095 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3096 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3097 goto ioctl_exit;
3098 }
3099 }
3100
3101 /* check if caller wants to look at return data or just return rc */
3102 if ((plen == NULL) || (out_data == NULL))
3103 goto ioctl_exit;
3104
3105 *plen = le32_to_cpu(rsp->OutputCount);
3106
3107 /* We check for obvious errors in the output buffer length and offset */
3108 if (*plen == 0)
3109 goto ioctl_exit; /* server returned no data */
3110 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3111 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3112 *plen = 0;
3113 rc = -EIO;
3114 goto ioctl_exit;
3115 }
3116
3117 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3118 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3119 le32_to_cpu(rsp->OutputOffset));
3120 *plen = 0;
3121 rc = -EIO;
3122 goto ioctl_exit;
3123 }
3124
3125 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3126 *plen, GFP_KERNEL);
3127 if (*out_data == NULL) {
3128 rc = -ENOMEM;
3129 goto ioctl_exit;
3130 }
3131
3132 ioctl_exit:
3133 SMB2_ioctl_free(&rqst);
3134 free_rsp_buf(resp_buftype, rsp);
3135 return rc;
3136 }
3137
3138 /*
3139 * Individual callers to ioctl worker function follow
3140 */
3141
3142 int
SMB2_set_compression(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3143 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3144 u64 persistent_fid, u64 volatile_fid)
3145 {
3146 int rc;
3147 struct compress_ioctl fsctl_input;
3148 char *ret_data = NULL;
3149
3150 fsctl_input.CompressionState =
3151 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3152
3153 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3154 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3155 (char *)&fsctl_input /* data input */,
3156 2 /* in data len */, CIFSMaxBufSize /* max out data */,
3157 &ret_data /* out data */, NULL);
3158
3159 cifs_dbg(FYI, "set compression rc %d\n", rc);
3160
3161 return rc;
3162 }
3163
3164 int
SMB2_close_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,bool query_attrs)3165 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3166 struct smb_rqst *rqst,
3167 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3168 {
3169 struct smb2_close_req *req;
3170 struct kvec *iov = rqst->rq_iov;
3171 unsigned int total_len;
3172 int rc;
3173
3174 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3175 (void **) &req, &total_len);
3176 if (rc)
3177 return rc;
3178
3179 req->PersistentFileId = persistent_fid;
3180 req->VolatileFileId = volatile_fid;
3181 if (query_attrs)
3182 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3183 else
3184 req->Flags = 0;
3185 iov[0].iov_base = (char *)req;
3186 iov[0].iov_len = total_len;
3187
3188 return 0;
3189 }
3190
3191 void
SMB2_close_free(struct smb_rqst * rqst)3192 SMB2_close_free(struct smb_rqst *rqst)
3193 {
3194 if (rqst && rqst->rq_iov)
3195 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3196 }
3197
3198 int
__SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_network_open_info * pbuf)3199 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3200 u64 persistent_fid, u64 volatile_fid,
3201 struct smb2_file_network_open_info *pbuf)
3202 {
3203 struct smb_rqst rqst;
3204 struct smb2_close_rsp *rsp = NULL;
3205 struct cifs_ses *ses = tcon->ses;
3206 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3207 struct kvec iov[1];
3208 struct kvec rsp_iov;
3209 int resp_buftype = CIFS_NO_BUFFER;
3210 int rc = 0;
3211 int flags = 0;
3212 bool query_attrs = false;
3213
3214 cifs_dbg(FYI, "Close\n");
3215
3216 if (!ses || !server)
3217 return -EIO;
3218
3219 if (smb3_encryption_required(tcon))
3220 flags |= CIFS_TRANSFORM_REQ;
3221
3222 memset(&rqst, 0, sizeof(struct smb_rqst));
3223 memset(&iov, 0, sizeof(iov));
3224 rqst.rq_iov = iov;
3225 rqst.rq_nvec = 1;
3226
3227 /* check if need to ask server to return timestamps in close response */
3228 if (pbuf)
3229 query_attrs = true;
3230
3231 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3232 rc = SMB2_close_init(tcon, server,
3233 &rqst, persistent_fid, volatile_fid,
3234 query_attrs);
3235 if (rc)
3236 goto close_exit;
3237
3238 rc = cifs_send_recv(xid, ses, server,
3239 &rqst, &resp_buftype, flags, &rsp_iov);
3240 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3241
3242 if (rc != 0) {
3243 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3244 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3245 rc);
3246 goto close_exit;
3247 } else {
3248 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3249 ses->Suid);
3250 /*
3251 * Note that have to subtract 4 since struct network_open_info
3252 * has a final 4 byte pad that close response does not have
3253 */
3254 if (pbuf)
3255 memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3256 }
3257
3258 atomic_dec(&tcon->num_remote_opens);
3259 close_exit:
3260 SMB2_close_free(&rqst);
3261 free_rsp_buf(resp_buftype, rsp);
3262
3263 /* retry close in a worker thread if this one is interrupted */
3264 if (is_interrupt_error(rc)) {
3265 int tmp_rc;
3266
3267 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3268 volatile_fid);
3269 if (tmp_rc)
3270 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3271 persistent_fid, tmp_rc);
3272 }
3273 return rc;
3274 }
3275
3276 int
SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3277 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3278 u64 persistent_fid, u64 volatile_fid)
3279 {
3280 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3281 }
3282
3283 int
smb2_validate_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int min_buf_size)3284 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3285 struct kvec *iov, unsigned int min_buf_size)
3286 {
3287 unsigned int smb_len = iov->iov_len;
3288 char *end_of_smb = smb_len + (char *)iov->iov_base;
3289 char *begin_of_buf = offset + (char *)iov->iov_base;
3290 char *end_of_buf = begin_of_buf + buffer_length;
3291
3292
3293 if (buffer_length < min_buf_size) {
3294 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3295 buffer_length, min_buf_size);
3296 return -EINVAL;
3297 }
3298
3299 /* check if beyond RFC1001 maximum length */
3300 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3301 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3302 buffer_length, smb_len);
3303 return -EINVAL;
3304 }
3305
3306 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3307 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3308 return -EINVAL;
3309 }
3310
3311 return 0;
3312 }
3313
3314 /*
3315 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3316 * Caller must free buffer.
3317 */
3318 int
smb2_validate_and_copy_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int minbufsize,char * data)3319 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3320 struct kvec *iov, unsigned int minbufsize,
3321 char *data)
3322 {
3323 char *begin_of_buf = offset + (char *)iov->iov_base;
3324 int rc;
3325
3326 if (!data)
3327 return -EINVAL;
3328
3329 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3330 if (rc)
3331 return rc;
3332
3333 memcpy(data, begin_of_buf, buffer_length);
3334
3335 return 0;
3336 }
3337
3338 int
SMB2_query_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t input_len,void * input)3339 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3340 struct smb_rqst *rqst,
3341 u64 persistent_fid, u64 volatile_fid,
3342 u8 info_class, u8 info_type, u32 additional_info,
3343 size_t output_len, size_t input_len, void *input)
3344 {
3345 struct smb2_query_info_req *req;
3346 struct kvec *iov = rqst->rq_iov;
3347 unsigned int total_len;
3348 int rc;
3349
3350 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3351 (void **) &req, &total_len);
3352 if (rc)
3353 return rc;
3354
3355 req->InfoType = info_type;
3356 req->FileInfoClass = info_class;
3357 req->PersistentFileId = persistent_fid;
3358 req->VolatileFileId = volatile_fid;
3359 req->AdditionalInformation = cpu_to_le32(additional_info);
3360
3361 req->OutputBufferLength = cpu_to_le32(output_len);
3362 if (input_len) {
3363 req->InputBufferLength = cpu_to_le32(input_len);
3364 /* total_len for smb query request never close to le16 max */
3365 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3366 memcpy(req->Buffer, input, input_len);
3367 }
3368
3369 iov[0].iov_base = (char *)req;
3370 /* 1 for Buffer */
3371 iov[0].iov_len = total_len - 1 + input_len;
3372 return 0;
3373 }
3374
3375 void
SMB2_query_info_free(struct smb_rqst * rqst)3376 SMB2_query_info_free(struct smb_rqst *rqst)
3377 {
3378 if (rqst && rqst->rq_iov)
3379 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3380 }
3381
3382 static int
query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t min_len,void ** data,u32 * dlen)3383 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3384 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3385 u32 additional_info, size_t output_len, size_t min_len, void **data,
3386 u32 *dlen)
3387 {
3388 struct smb_rqst rqst;
3389 struct smb2_query_info_rsp *rsp = NULL;
3390 struct kvec iov[1];
3391 struct kvec rsp_iov;
3392 int rc = 0;
3393 int resp_buftype = CIFS_NO_BUFFER;
3394 struct cifs_ses *ses = tcon->ses;
3395 struct TCP_Server_Info *server;
3396 int flags = 0;
3397 bool allocated = false;
3398
3399 cifs_dbg(FYI, "Query Info\n");
3400
3401 if (!ses)
3402 return -EIO;
3403 server = cifs_pick_channel(ses);
3404 if (!server)
3405 return -EIO;
3406
3407 if (smb3_encryption_required(tcon))
3408 flags |= CIFS_TRANSFORM_REQ;
3409
3410 memset(&rqst, 0, sizeof(struct smb_rqst));
3411 memset(&iov, 0, sizeof(iov));
3412 rqst.rq_iov = iov;
3413 rqst.rq_nvec = 1;
3414
3415 rc = SMB2_query_info_init(tcon, server,
3416 &rqst, persistent_fid, volatile_fid,
3417 info_class, info_type, additional_info,
3418 output_len, 0, NULL);
3419 if (rc)
3420 goto qinf_exit;
3421
3422 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3423 ses->Suid, info_class, (__u32)info_type);
3424
3425 rc = cifs_send_recv(xid, ses, server,
3426 &rqst, &resp_buftype, flags, &rsp_iov);
3427 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3428
3429 if (rc) {
3430 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3431 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3432 ses->Suid, info_class, (__u32)info_type, rc);
3433 goto qinf_exit;
3434 }
3435
3436 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3437 ses->Suid, info_class, (__u32)info_type);
3438
3439 if (dlen) {
3440 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3441 if (!*data) {
3442 *data = kmalloc(*dlen, GFP_KERNEL);
3443 if (!*data) {
3444 cifs_tcon_dbg(VFS,
3445 "Error %d allocating memory for acl\n",
3446 rc);
3447 *dlen = 0;
3448 rc = -ENOMEM;
3449 goto qinf_exit;
3450 }
3451 allocated = true;
3452 }
3453 }
3454
3455 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3456 le32_to_cpu(rsp->OutputBufferLength),
3457 &rsp_iov, min_len, *data);
3458 if (rc && allocated) {
3459 kfree(*data);
3460 *data = NULL;
3461 *dlen = 0;
3462 }
3463
3464 qinf_exit:
3465 SMB2_query_info_free(&rqst);
3466 free_rsp_buf(resp_buftype, rsp);
3467 return rc;
3468 }
3469
SMB2_query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_all_info * data)3470 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3471 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3472 {
3473 return query_info(xid, tcon, persistent_fid, volatile_fid,
3474 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3475 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3476 sizeof(struct smb2_file_all_info), (void **)&data,
3477 NULL);
3478 }
3479
3480 int
SMB311_posix_query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb311_posix_qinfo * data,u32 * plen)3481 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3482 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3483 {
3484 size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3485 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3486 *plen = 0;
3487
3488 return query_info(xid, tcon, persistent_fid, volatile_fid,
3489 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3490 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3491 }
3492
3493 int
SMB2_query_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,void ** data,u32 * plen,u32 extra_info)3494 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3495 u64 persistent_fid, u64 volatile_fid,
3496 void **data, u32 *plen, u32 extra_info)
3497 {
3498 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3499 extra_info;
3500 *plen = 0;
3501
3502 return query_info(xid, tcon, persistent_fid, volatile_fid,
3503 0, SMB2_O_INFO_SECURITY, additional_info,
3504 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3505 }
3506
3507 int
SMB2_get_srv_num(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le64 * uniqueid)3508 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3509 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3510 {
3511 return query_info(xid, tcon, persistent_fid, volatile_fid,
3512 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3513 sizeof(struct smb2_file_internal_info),
3514 sizeof(struct smb2_file_internal_info),
3515 (void **)&uniqueid, NULL);
3516 }
3517
3518 /*
3519 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3520 * See MS-SMB2 2.2.35 and 2.2.36
3521 */
3522
3523 static int
SMB2_notify_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid,u32 completion_filter,bool watch_tree)3524 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3525 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3526 u64 persistent_fid, u64 volatile_fid,
3527 u32 completion_filter, bool watch_tree)
3528 {
3529 struct smb2_change_notify_req *req;
3530 struct kvec *iov = rqst->rq_iov;
3531 unsigned int total_len;
3532 int rc;
3533
3534 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3535 (void **) &req, &total_len);
3536 if (rc)
3537 return rc;
3538
3539 req->PersistentFileId = persistent_fid;
3540 req->VolatileFileId = volatile_fid;
3541 /* See note 354 of MS-SMB2, 64K max */
3542 req->OutputBufferLength =
3543 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3544 req->CompletionFilter = cpu_to_le32(completion_filter);
3545 if (watch_tree)
3546 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3547 else
3548 req->Flags = 0;
3549
3550 iov[0].iov_base = (char *)req;
3551 iov[0].iov_len = total_len;
3552
3553 return 0;
3554 }
3555
3556 int
SMB2_change_notify(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,bool watch_tree,u32 completion_filter)3557 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3558 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3559 u32 completion_filter)
3560 {
3561 struct cifs_ses *ses = tcon->ses;
3562 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3563 struct smb_rqst rqst;
3564 struct kvec iov[1];
3565 struct kvec rsp_iov = {NULL, 0};
3566 int resp_buftype = CIFS_NO_BUFFER;
3567 int flags = 0;
3568 int rc = 0;
3569
3570 cifs_dbg(FYI, "change notify\n");
3571 if (!ses || !server)
3572 return -EIO;
3573
3574 if (smb3_encryption_required(tcon))
3575 flags |= CIFS_TRANSFORM_REQ;
3576
3577 memset(&rqst, 0, sizeof(struct smb_rqst));
3578 memset(&iov, 0, sizeof(iov));
3579 rqst.rq_iov = iov;
3580 rqst.rq_nvec = 1;
3581
3582 rc = SMB2_notify_init(xid, &rqst, tcon, server,
3583 persistent_fid, volatile_fid,
3584 completion_filter, watch_tree);
3585 if (rc)
3586 goto cnotify_exit;
3587
3588 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3589 (u8)watch_tree, completion_filter);
3590 rc = cifs_send_recv(xid, ses, server,
3591 &rqst, &resp_buftype, flags, &rsp_iov);
3592
3593 if (rc != 0) {
3594 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3595 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3596 (u8)watch_tree, completion_filter, rc);
3597 } else
3598 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3599 ses->Suid, (u8)watch_tree, completion_filter);
3600
3601 cnotify_exit:
3602 if (rqst.rq_iov)
3603 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3604 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3605 return rc;
3606 }
3607
3608
3609
3610 /*
3611 * This is a no-op for now. We're not really interested in the reply, but
3612 * rather in the fact that the server sent one and that server->lstrp
3613 * gets updated.
3614 *
3615 * FIXME: maybe we should consider checking that the reply matches request?
3616 */
3617 static void
smb2_echo_callback(struct mid_q_entry * mid)3618 smb2_echo_callback(struct mid_q_entry *mid)
3619 {
3620 struct TCP_Server_Info *server = mid->callback_data;
3621 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3622 struct cifs_credits credits = { .value = 0, .instance = 0 };
3623
3624 if (mid->mid_state == MID_RESPONSE_RECEIVED
3625 || mid->mid_state == MID_RESPONSE_MALFORMED) {
3626 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3627 credits.instance = server->reconnect_instance;
3628 }
3629
3630 DeleteMidQEntry(mid);
3631 add_credits(server, &credits, CIFS_ECHO_OP);
3632 }
3633
smb2_reconnect_server(struct work_struct * work)3634 void smb2_reconnect_server(struct work_struct *work)
3635 {
3636 struct TCP_Server_Info *server = container_of(work,
3637 struct TCP_Server_Info, reconnect.work);
3638 struct cifs_ses *ses;
3639 struct cifs_tcon *tcon, *tcon2;
3640 struct list_head tmp_list;
3641 int tcon_exist = false;
3642 int rc;
3643 int resched = false;
3644
3645
3646 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3647 mutex_lock(&server->reconnect_mutex);
3648
3649 INIT_LIST_HEAD(&tmp_list);
3650 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3651
3652 spin_lock(&cifs_tcp_ses_lock);
3653 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3654 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3655 if (tcon->need_reconnect || tcon->need_reopen_files) {
3656 tcon->tc_count++;
3657 list_add_tail(&tcon->rlist, &tmp_list);
3658 tcon_exist = true;
3659 }
3660 }
3661 /*
3662 * IPC has the same lifetime as its session and uses its
3663 * refcount.
3664 */
3665 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3666 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3667 tcon_exist = true;
3668 ses->ses_count++;
3669 }
3670 }
3671 /*
3672 * Get the reference to server struct to be sure that the last call of
3673 * cifs_put_tcon() in the loop below won't release the server pointer.
3674 */
3675 if (tcon_exist)
3676 server->srv_count++;
3677
3678 spin_unlock(&cifs_tcp_ses_lock);
3679
3680 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3681 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3682 if (!rc)
3683 cifs_reopen_persistent_handles(tcon);
3684 else
3685 resched = true;
3686 list_del_init(&tcon->rlist);
3687 if (tcon->ipc)
3688 cifs_put_smb_ses(tcon->ses);
3689 else
3690 cifs_put_tcon(tcon);
3691 }
3692
3693 cifs_dbg(FYI, "Reconnecting tcons finished\n");
3694 if (resched)
3695 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3696 mutex_unlock(&server->reconnect_mutex);
3697
3698 /* now we can safely release srv struct */
3699 if (tcon_exist)
3700 cifs_put_tcp_session(server, 1);
3701 }
3702
3703 int
SMB2_echo(struct TCP_Server_Info * server)3704 SMB2_echo(struct TCP_Server_Info *server)
3705 {
3706 struct smb2_echo_req *req;
3707 int rc = 0;
3708 struct kvec iov[1];
3709 struct smb_rqst rqst = { .rq_iov = iov,
3710 .rq_nvec = 1 };
3711 unsigned int total_len;
3712
3713 cifs_dbg(FYI, "In echo request\n");
3714
3715 if (server->tcpStatus == CifsNeedNegotiate) {
3716 /* No need to send echo on newly established connections */
3717 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3718 return rc;
3719 }
3720
3721 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3722 (void **)&req, &total_len);
3723 if (rc)
3724 return rc;
3725
3726 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3727
3728 iov[0].iov_len = total_len;
3729 iov[0].iov_base = (char *)req;
3730
3731 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3732 server, CIFS_ECHO_OP, NULL);
3733 if (rc)
3734 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3735
3736 cifs_small_buf_release(req);
3737 return rc;
3738 }
3739
3740 void
SMB2_flush_free(struct smb_rqst * rqst)3741 SMB2_flush_free(struct smb_rqst *rqst)
3742 {
3743 if (rqst && rqst->rq_iov)
3744 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3745 }
3746
3747 int
SMB2_flush_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid)3748 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3749 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3750 u64 persistent_fid, u64 volatile_fid)
3751 {
3752 struct smb2_flush_req *req;
3753 struct kvec *iov = rqst->rq_iov;
3754 unsigned int total_len;
3755 int rc;
3756
3757 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3758 (void **) &req, &total_len);
3759 if (rc)
3760 return rc;
3761
3762 req->PersistentFileId = persistent_fid;
3763 req->VolatileFileId = volatile_fid;
3764
3765 iov[0].iov_base = (char *)req;
3766 iov[0].iov_len = total_len;
3767
3768 return 0;
3769 }
3770
3771 int
SMB2_flush(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3772 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3773 u64 volatile_fid)
3774 {
3775 struct cifs_ses *ses = tcon->ses;
3776 struct smb_rqst rqst;
3777 struct kvec iov[1];
3778 struct kvec rsp_iov = {NULL, 0};
3779 struct TCP_Server_Info *server = cifs_pick_channel(ses);
3780 int resp_buftype = CIFS_NO_BUFFER;
3781 int flags = 0;
3782 int rc = 0;
3783
3784 cifs_dbg(FYI, "flush\n");
3785 if (!ses || !(ses->server))
3786 return -EIO;
3787
3788 if (smb3_encryption_required(tcon))
3789 flags |= CIFS_TRANSFORM_REQ;
3790
3791 memset(&rqst, 0, sizeof(struct smb_rqst));
3792 memset(&iov, 0, sizeof(iov));
3793 rqst.rq_iov = iov;
3794 rqst.rq_nvec = 1;
3795
3796 rc = SMB2_flush_init(xid, &rqst, tcon, server,
3797 persistent_fid, volatile_fid);
3798 if (rc)
3799 goto flush_exit;
3800
3801 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3802 rc = cifs_send_recv(xid, ses, server,
3803 &rqst, &resp_buftype, flags, &rsp_iov);
3804
3805 if (rc != 0) {
3806 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3807 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3808 rc);
3809 } else
3810 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3811 ses->Suid);
3812
3813 flush_exit:
3814 SMB2_flush_free(&rqst);
3815 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3816 return rc;
3817 }
3818
3819 /*
3820 * To form a chain of read requests, any read requests after the first should
3821 * have the end_of_chain boolean set to true.
3822 */
3823 static int
smb2_new_read_req(void ** buf,unsigned int * total_len,struct cifs_io_parms * io_parms,struct cifs_readdata * rdata,unsigned int remaining_bytes,int request_type)3824 smb2_new_read_req(void **buf, unsigned int *total_len,
3825 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3826 unsigned int remaining_bytes, int request_type)
3827 {
3828 int rc = -EACCES;
3829 struct smb2_read_plain_req *req = NULL;
3830 struct smb2_sync_hdr *shdr;
3831 struct TCP_Server_Info *server = io_parms->server;
3832
3833 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3834 (void **) &req, total_len);
3835 if (rc)
3836 return rc;
3837
3838 if (server == NULL)
3839 return -ECONNABORTED;
3840
3841 shdr = &req->sync_hdr;
3842 shdr->ProcessId = cpu_to_le32(io_parms->pid);
3843
3844 req->PersistentFileId = io_parms->persistent_fid;
3845 req->VolatileFileId = io_parms->volatile_fid;
3846 req->ReadChannelInfoOffset = 0; /* reserved */
3847 req->ReadChannelInfoLength = 0; /* reserved */
3848 req->Channel = 0; /* reserved */
3849 req->MinimumCount = 0;
3850 req->Length = cpu_to_le32(io_parms->length);
3851 req->Offset = cpu_to_le64(io_parms->offset);
3852
3853 trace_smb3_read_enter(0 /* xid */,
3854 io_parms->persistent_fid,
3855 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3856 io_parms->offset, io_parms->length);
3857 #ifdef CONFIG_CIFS_SMB_DIRECT
3858 /*
3859 * If we want to do a RDMA write, fill in and append
3860 * smbd_buffer_descriptor_v1 to the end of read request
3861 */
3862 if (server->rdma && rdata && !server->sign &&
3863 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3864
3865 struct smbd_buffer_descriptor_v1 *v1;
3866 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3867
3868 rdata->mr = smbd_register_mr(
3869 server->smbd_conn, rdata->pages,
3870 rdata->nr_pages, rdata->page_offset,
3871 rdata->tailsz, true, need_invalidate);
3872 if (!rdata->mr)
3873 return -EAGAIN;
3874
3875 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3876 if (need_invalidate)
3877 req->Channel = SMB2_CHANNEL_RDMA_V1;
3878 req->ReadChannelInfoOffset =
3879 cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3880 req->ReadChannelInfoLength =
3881 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3882 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3883 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3884 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3885 v1->length = cpu_to_le32(rdata->mr->mr->length);
3886
3887 *total_len += sizeof(*v1) - 1;
3888 }
3889 #endif
3890 if (request_type & CHAINED_REQUEST) {
3891 if (!(request_type & END_OF_CHAIN)) {
3892 /* next 8-byte aligned request */
3893 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3894 shdr->NextCommand = cpu_to_le32(*total_len);
3895 } else /* END_OF_CHAIN */
3896 shdr->NextCommand = 0;
3897 if (request_type & RELATED_REQUEST) {
3898 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3899 /*
3900 * Related requests use info from previous read request
3901 * in chain.
3902 */
3903 shdr->SessionId = 0xFFFFFFFF;
3904 shdr->TreeId = 0xFFFFFFFF;
3905 req->PersistentFileId = 0xFFFFFFFF;
3906 req->VolatileFileId = 0xFFFFFFFF;
3907 }
3908 }
3909 if (remaining_bytes > io_parms->length)
3910 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3911 else
3912 req->RemainingBytes = 0;
3913
3914 *buf = req;
3915 return rc;
3916 }
3917
3918 static void
smb2_readv_callback(struct mid_q_entry * mid)3919 smb2_readv_callback(struct mid_q_entry *mid)
3920 {
3921 struct cifs_readdata *rdata = mid->callback_data;
3922 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3923 struct TCP_Server_Info *server = rdata->server;
3924 struct smb2_sync_hdr *shdr =
3925 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3926 struct cifs_credits credits = { .value = 0, .instance = 0 };
3927 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3928 .rq_nvec = 1,
3929 .rq_pages = rdata->pages,
3930 .rq_offset = rdata->page_offset,
3931 .rq_npages = rdata->nr_pages,
3932 .rq_pagesz = rdata->pagesz,
3933 .rq_tailsz = rdata->tailsz };
3934
3935 WARN_ONCE(rdata->server != mid->server,
3936 "rdata server %p != mid server %p",
3937 rdata->server, mid->server);
3938
3939 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3940 __func__, mid->mid, mid->mid_state, rdata->result,
3941 rdata->bytes);
3942
3943 switch (mid->mid_state) {
3944 case MID_RESPONSE_RECEIVED:
3945 credits.value = le16_to_cpu(shdr->CreditRequest);
3946 credits.instance = server->reconnect_instance;
3947 /* result already set, check signature */
3948 if (server->sign && !mid->decrypted) {
3949 int rc;
3950
3951 rc = smb2_verify_signature(&rqst, server);
3952 if (rc)
3953 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3954 rc);
3955 }
3956 /* FIXME: should this be counted toward the initiating task? */
3957 task_io_account_read(rdata->got_bytes);
3958 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3959 break;
3960 case MID_REQUEST_SUBMITTED:
3961 case MID_RETRY_NEEDED:
3962 rdata->result = -EAGAIN;
3963 if (server->sign && rdata->got_bytes)
3964 /* reset bytes number since we can not check a sign */
3965 rdata->got_bytes = 0;
3966 /* FIXME: should this be counted toward the initiating task? */
3967 task_io_account_read(rdata->got_bytes);
3968 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3969 break;
3970 case MID_RESPONSE_MALFORMED:
3971 credits.value = le16_to_cpu(shdr->CreditRequest);
3972 credits.instance = server->reconnect_instance;
3973 fallthrough;
3974 default:
3975 rdata->result = -EIO;
3976 }
3977 #ifdef CONFIG_CIFS_SMB_DIRECT
3978 /*
3979 * If this rdata has a memmory registered, the MR can be freed
3980 * MR needs to be freed as soon as I/O finishes to prevent deadlock
3981 * because they have limited number and are used for future I/Os
3982 */
3983 if (rdata->mr) {
3984 smbd_deregister_mr(rdata->mr);
3985 rdata->mr = NULL;
3986 }
3987 #endif
3988 if (rdata->result && rdata->result != -ENODATA) {
3989 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3990 trace_smb3_read_err(0 /* xid */,
3991 rdata->cfile->fid.persistent_fid,
3992 tcon->tid, tcon->ses->Suid, rdata->offset,
3993 rdata->bytes, rdata->result);
3994 } else
3995 trace_smb3_read_done(0 /* xid */,
3996 rdata->cfile->fid.persistent_fid,
3997 tcon->tid, tcon->ses->Suid,
3998 rdata->offset, rdata->got_bytes);
3999
4000 queue_work(cifsiod_wq, &rdata->work);
4001 DeleteMidQEntry(mid);
4002 add_credits(server, &credits, 0);
4003 }
4004
4005 /* smb2_async_readv - send an async read, and set up mid to handle result */
4006 int
smb2_async_readv(struct cifs_readdata * rdata)4007 smb2_async_readv(struct cifs_readdata *rdata)
4008 {
4009 int rc, flags = 0;
4010 char *buf;
4011 struct smb2_sync_hdr *shdr;
4012 struct cifs_io_parms io_parms;
4013 struct smb_rqst rqst = { .rq_iov = rdata->iov,
4014 .rq_nvec = 1 };
4015 struct TCP_Server_Info *server;
4016 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4017 unsigned int total_len;
4018
4019 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4020 __func__, rdata->offset, rdata->bytes);
4021
4022 if (!rdata->server)
4023 rdata->server = cifs_pick_channel(tcon->ses);
4024
4025 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4026 io_parms.server = server = rdata->server;
4027 io_parms.offset = rdata->offset;
4028 io_parms.length = rdata->bytes;
4029 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4030 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4031 io_parms.pid = rdata->pid;
4032
4033 rc = smb2_new_read_req(
4034 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4035 if (rc)
4036 return rc;
4037
4038 if (smb3_encryption_required(io_parms.tcon))
4039 flags |= CIFS_TRANSFORM_REQ;
4040
4041 rdata->iov[0].iov_base = buf;
4042 rdata->iov[0].iov_len = total_len;
4043
4044 shdr = (struct smb2_sync_hdr *)buf;
4045
4046 if (rdata->credits.value > 0) {
4047 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4048 SMB2_MAX_BUFFER_SIZE));
4049 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4050
4051 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4052 if (rc)
4053 goto async_readv_out;
4054
4055 flags |= CIFS_HAS_CREDITS;
4056 }
4057
4058 kref_get(&rdata->refcount);
4059 rc = cifs_call_async(server, &rqst,
4060 cifs_readv_receive, smb2_readv_callback,
4061 smb3_handle_read_data, rdata, flags,
4062 &rdata->credits);
4063 if (rc) {
4064 kref_put(&rdata->refcount, cifs_readdata_release);
4065 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4066 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4067 io_parms.tcon->tid,
4068 io_parms.tcon->ses->Suid,
4069 io_parms.offset, io_parms.length, rc);
4070 }
4071
4072 async_readv_out:
4073 cifs_small_buf_release(buf);
4074 return rc;
4075 }
4076
4077 int
SMB2_read(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,char ** buf,int * buf_type)4078 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4079 unsigned int *nbytes, char **buf, int *buf_type)
4080 {
4081 struct smb_rqst rqst;
4082 int resp_buftype, rc;
4083 struct smb2_read_plain_req *req = NULL;
4084 struct smb2_read_rsp *rsp = NULL;
4085 struct kvec iov[1];
4086 struct kvec rsp_iov;
4087 unsigned int total_len;
4088 int flags = CIFS_LOG_ERROR;
4089 struct cifs_ses *ses = io_parms->tcon->ses;
4090
4091 if (!io_parms->server)
4092 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4093
4094 *nbytes = 0;
4095 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4096 if (rc)
4097 return rc;
4098
4099 if (smb3_encryption_required(io_parms->tcon))
4100 flags |= CIFS_TRANSFORM_REQ;
4101
4102 iov[0].iov_base = (char *)req;
4103 iov[0].iov_len = total_len;
4104
4105 memset(&rqst, 0, sizeof(struct smb_rqst));
4106 rqst.rq_iov = iov;
4107 rqst.rq_nvec = 1;
4108
4109 rc = cifs_send_recv(xid, ses, io_parms->server,
4110 &rqst, &resp_buftype, flags, &rsp_iov);
4111 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4112
4113 if (rc) {
4114 if (rc != -ENODATA) {
4115 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4116 cifs_dbg(VFS, "Send error in read = %d\n", rc);
4117 trace_smb3_read_err(xid, req->PersistentFileId,
4118 io_parms->tcon->tid, ses->Suid,
4119 io_parms->offset, io_parms->length,
4120 rc);
4121 } else
4122 trace_smb3_read_done(xid, req->PersistentFileId,
4123 io_parms->tcon->tid, ses->Suid,
4124 io_parms->offset, 0);
4125 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4126 cifs_small_buf_release(req);
4127 return rc == -ENODATA ? 0 : rc;
4128 } else
4129 trace_smb3_read_done(xid, req->PersistentFileId,
4130 io_parms->tcon->tid, ses->Suid,
4131 io_parms->offset, io_parms->length);
4132
4133 cifs_small_buf_release(req);
4134
4135 *nbytes = le32_to_cpu(rsp->DataLength);
4136 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4137 (*nbytes > io_parms->length)) {
4138 cifs_dbg(FYI, "bad length %d for count %d\n",
4139 *nbytes, io_parms->length);
4140 rc = -EIO;
4141 *nbytes = 0;
4142 }
4143
4144 if (*buf) {
4145 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4146 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4147 } else if (resp_buftype != CIFS_NO_BUFFER) {
4148 *buf = rsp_iov.iov_base;
4149 if (resp_buftype == CIFS_SMALL_BUFFER)
4150 *buf_type = CIFS_SMALL_BUFFER;
4151 else if (resp_buftype == CIFS_LARGE_BUFFER)
4152 *buf_type = CIFS_LARGE_BUFFER;
4153 }
4154 return rc;
4155 }
4156
4157 /*
4158 * Check the mid_state and signature on received buffer (if any), and queue the
4159 * workqueue completion task.
4160 */
4161 static void
smb2_writev_callback(struct mid_q_entry * mid)4162 smb2_writev_callback(struct mid_q_entry *mid)
4163 {
4164 struct cifs_writedata *wdata = mid->callback_data;
4165 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4166 struct TCP_Server_Info *server = wdata->server;
4167 unsigned int written;
4168 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4169 struct cifs_credits credits = { .value = 0, .instance = 0 };
4170
4171 WARN_ONCE(wdata->server != mid->server,
4172 "wdata server %p != mid server %p",
4173 wdata->server, mid->server);
4174
4175 switch (mid->mid_state) {
4176 case MID_RESPONSE_RECEIVED:
4177 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4178 credits.instance = server->reconnect_instance;
4179 wdata->result = smb2_check_receive(mid, server, 0);
4180 if (wdata->result != 0)
4181 break;
4182
4183 written = le32_to_cpu(rsp->DataLength);
4184 /*
4185 * Mask off high 16 bits when bytes written as returned
4186 * by the server is greater than bytes requested by the
4187 * client. OS/2 servers are known to set incorrect
4188 * CountHigh values.
4189 */
4190 if (written > wdata->bytes)
4191 written &= 0xFFFF;
4192
4193 if (written < wdata->bytes)
4194 wdata->result = -ENOSPC;
4195 else
4196 wdata->bytes = written;
4197 break;
4198 case MID_REQUEST_SUBMITTED:
4199 case MID_RETRY_NEEDED:
4200 wdata->result = -EAGAIN;
4201 break;
4202 case MID_RESPONSE_MALFORMED:
4203 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4204 credits.instance = server->reconnect_instance;
4205 fallthrough;
4206 default:
4207 wdata->result = -EIO;
4208 break;
4209 }
4210 #ifdef CONFIG_CIFS_SMB_DIRECT
4211 /*
4212 * If this wdata has a memory registered, the MR can be freed
4213 * The number of MRs available is limited, it's important to recover
4214 * used MR as soon as I/O is finished. Hold MR longer in the later
4215 * I/O process can possibly result in I/O deadlock due to lack of MR
4216 * to send request on I/O retry
4217 */
4218 if (wdata->mr) {
4219 smbd_deregister_mr(wdata->mr);
4220 wdata->mr = NULL;
4221 }
4222 #endif
4223 if (wdata->result) {
4224 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4225 trace_smb3_write_err(0 /* no xid */,
4226 wdata->cfile->fid.persistent_fid,
4227 tcon->tid, tcon->ses->Suid, wdata->offset,
4228 wdata->bytes, wdata->result);
4229 if (wdata->result == -ENOSPC)
4230 pr_warn_once("Out of space writing to %s\n",
4231 tcon->treeName);
4232 } else
4233 trace_smb3_write_done(0 /* no xid */,
4234 wdata->cfile->fid.persistent_fid,
4235 tcon->tid, tcon->ses->Suid,
4236 wdata->offset, wdata->bytes);
4237
4238 queue_work(cifsiod_wq, &wdata->work);
4239 DeleteMidQEntry(mid);
4240 add_credits(server, &credits, 0);
4241 }
4242
4243 /* smb2_async_writev - send an async write, and set up mid to handle result */
4244 int
smb2_async_writev(struct cifs_writedata * wdata,void (* release)(struct kref * kref))4245 smb2_async_writev(struct cifs_writedata *wdata,
4246 void (*release)(struct kref *kref))
4247 {
4248 int rc = -EACCES, flags = 0;
4249 struct smb2_write_req *req = NULL;
4250 struct smb2_sync_hdr *shdr;
4251 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4252 struct TCP_Server_Info *server = wdata->server;
4253 struct kvec iov[1];
4254 struct smb_rqst rqst = { };
4255 unsigned int total_len;
4256
4257 if (!wdata->server)
4258 server = wdata->server = cifs_pick_channel(tcon->ses);
4259
4260 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4261 (void **) &req, &total_len);
4262 if (rc)
4263 return rc;
4264
4265 if (smb3_encryption_required(tcon))
4266 flags |= CIFS_TRANSFORM_REQ;
4267
4268 shdr = (struct smb2_sync_hdr *)req;
4269 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4270
4271 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4272 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4273 req->WriteChannelInfoOffset = 0;
4274 req->WriteChannelInfoLength = 0;
4275 req->Channel = 0;
4276 req->Offset = cpu_to_le64(wdata->offset);
4277 req->DataOffset = cpu_to_le16(
4278 offsetof(struct smb2_write_req, Buffer));
4279 req->RemainingBytes = 0;
4280
4281 trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4282 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4283 #ifdef CONFIG_CIFS_SMB_DIRECT
4284 /*
4285 * If we want to do a server RDMA read, fill in and append
4286 * smbd_buffer_descriptor_v1 to the end of write request
4287 */
4288 if (server->rdma && !server->sign && wdata->bytes >=
4289 server->smbd_conn->rdma_readwrite_threshold) {
4290
4291 struct smbd_buffer_descriptor_v1 *v1;
4292 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4293
4294 wdata->mr = smbd_register_mr(
4295 server->smbd_conn, wdata->pages,
4296 wdata->nr_pages, wdata->page_offset,
4297 wdata->tailsz, false, need_invalidate);
4298 if (!wdata->mr) {
4299 rc = -EAGAIN;
4300 goto async_writev_out;
4301 }
4302 req->Length = 0;
4303 req->DataOffset = 0;
4304 if (wdata->nr_pages > 1)
4305 req->RemainingBytes =
4306 cpu_to_le32(
4307 (wdata->nr_pages - 1) * wdata->pagesz -
4308 wdata->page_offset + wdata->tailsz
4309 );
4310 else
4311 req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4312 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4313 if (need_invalidate)
4314 req->Channel = SMB2_CHANNEL_RDMA_V1;
4315 req->WriteChannelInfoOffset =
4316 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4317 req->WriteChannelInfoLength =
4318 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4319 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4320 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4321 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4322 v1->length = cpu_to_le32(wdata->mr->mr->length);
4323 }
4324 #endif
4325 iov[0].iov_len = total_len - 1;
4326 iov[0].iov_base = (char *)req;
4327
4328 rqst.rq_iov = iov;
4329 rqst.rq_nvec = 1;
4330 rqst.rq_pages = wdata->pages;
4331 rqst.rq_offset = wdata->page_offset;
4332 rqst.rq_npages = wdata->nr_pages;
4333 rqst.rq_pagesz = wdata->pagesz;
4334 rqst.rq_tailsz = wdata->tailsz;
4335 #ifdef CONFIG_CIFS_SMB_DIRECT
4336 if (wdata->mr) {
4337 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4338 rqst.rq_npages = 0;
4339 }
4340 #endif
4341 cifs_dbg(FYI, "async write at %llu %u bytes\n",
4342 wdata->offset, wdata->bytes);
4343
4344 #ifdef CONFIG_CIFS_SMB_DIRECT
4345 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4346 if (!wdata->mr)
4347 req->Length = cpu_to_le32(wdata->bytes);
4348 #else
4349 req->Length = cpu_to_le32(wdata->bytes);
4350 #endif
4351
4352 if (wdata->credits.value > 0) {
4353 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4354 SMB2_MAX_BUFFER_SIZE));
4355 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4356
4357 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4358 if (rc)
4359 goto async_writev_out;
4360
4361 flags |= CIFS_HAS_CREDITS;
4362 }
4363
4364 kref_get(&wdata->refcount);
4365 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4366 wdata, flags, &wdata->credits);
4367
4368 if (rc) {
4369 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4370 tcon->tid, tcon->ses->Suid, wdata->offset,
4371 wdata->bytes, rc);
4372 kref_put(&wdata->refcount, release);
4373 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4374 }
4375
4376 async_writev_out:
4377 cifs_small_buf_release(req);
4378 return rc;
4379 }
4380
4381 /*
4382 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4383 * The length field from io_parms must be at least 1 and indicates a number of
4384 * elements with data to write that begins with position 1 in iov array. All
4385 * data length is specified by count.
4386 */
4387 int
SMB2_write(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,struct kvec * iov,int n_vec)4388 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4389 unsigned int *nbytes, struct kvec *iov, int n_vec)
4390 {
4391 struct smb_rqst rqst;
4392 int rc = 0;
4393 struct smb2_write_req *req = NULL;
4394 struct smb2_write_rsp *rsp = NULL;
4395 int resp_buftype;
4396 struct kvec rsp_iov;
4397 int flags = 0;
4398 unsigned int total_len;
4399 struct TCP_Server_Info *server;
4400
4401 *nbytes = 0;
4402
4403 if (n_vec < 1)
4404 return rc;
4405
4406 if (!io_parms->server)
4407 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4408 server = io_parms->server;
4409 if (server == NULL)
4410 return -ECONNABORTED;
4411
4412 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4413 (void **) &req, &total_len);
4414 if (rc)
4415 return rc;
4416
4417 if (smb3_encryption_required(io_parms->tcon))
4418 flags |= CIFS_TRANSFORM_REQ;
4419
4420 req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4421
4422 req->PersistentFileId = io_parms->persistent_fid;
4423 req->VolatileFileId = io_parms->volatile_fid;
4424 req->WriteChannelInfoOffset = 0;
4425 req->WriteChannelInfoLength = 0;
4426 req->Channel = 0;
4427 req->Length = cpu_to_le32(io_parms->length);
4428 req->Offset = cpu_to_le64(io_parms->offset);
4429 req->DataOffset = cpu_to_le16(
4430 offsetof(struct smb2_write_req, Buffer));
4431 req->RemainingBytes = 0;
4432
4433 trace_smb3_write_enter(xid, io_parms->persistent_fid,
4434 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4435 io_parms->offset, io_parms->length);
4436
4437 iov[0].iov_base = (char *)req;
4438 /* 1 for Buffer */
4439 iov[0].iov_len = total_len - 1;
4440
4441 memset(&rqst, 0, sizeof(struct smb_rqst));
4442 rqst.rq_iov = iov;
4443 rqst.rq_nvec = n_vec + 1;
4444
4445 rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4446 &rqst,
4447 &resp_buftype, flags, &rsp_iov);
4448 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4449
4450 if (rc) {
4451 trace_smb3_write_err(xid, req->PersistentFileId,
4452 io_parms->tcon->tid,
4453 io_parms->tcon->ses->Suid,
4454 io_parms->offset, io_parms->length, rc);
4455 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4456 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4457 } else {
4458 *nbytes = le32_to_cpu(rsp->DataLength);
4459 trace_smb3_write_done(xid, req->PersistentFileId,
4460 io_parms->tcon->tid,
4461 io_parms->tcon->ses->Suid,
4462 io_parms->offset, *nbytes);
4463 }
4464
4465 cifs_small_buf_release(req);
4466 free_rsp_buf(resp_buftype, rsp);
4467 return rc;
4468 }
4469
posix_info_sid_size(const void * beg,const void * end)4470 int posix_info_sid_size(const void *beg, const void *end)
4471 {
4472 size_t subauth;
4473 int total;
4474
4475 if (beg + 1 > end)
4476 return -1;
4477
4478 subauth = *(u8 *)(beg+1);
4479 if (subauth < 1 || subauth > 15)
4480 return -1;
4481
4482 total = 1 + 1 + 6 + 4*subauth;
4483 if (beg + total > end)
4484 return -1;
4485
4486 return total;
4487 }
4488
posix_info_parse(const void * beg,const void * end,struct smb2_posix_info_parsed * out)4489 int posix_info_parse(const void *beg, const void *end,
4490 struct smb2_posix_info_parsed *out)
4491
4492 {
4493 int total_len = 0;
4494 int sid_len;
4495 int name_len;
4496 const void *owner_sid;
4497 const void *group_sid;
4498 const void *name;
4499
4500 /* if no end bound given, assume payload to be correct */
4501 if (!end) {
4502 const struct smb2_posix_info *p = beg;
4503
4504 end = beg + le32_to_cpu(p->NextEntryOffset);
4505 /* last element will have a 0 offset, pick a sensible bound */
4506 if (end == beg)
4507 end += 0xFFFF;
4508 }
4509
4510 /* check base buf */
4511 if (beg + sizeof(struct smb2_posix_info) > end)
4512 return -1;
4513 total_len = sizeof(struct smb2_posix_info);
4514
4515 /* check owner sid */
4516 owner_sid = beg + total_len;
4517 sid_len = posix_info_sid_size(owner_sid, end);
4518 if (sid_len < 0)
4519 return -1;
4520 total_len += sid_len;
4521
4522 /* check group sid */
4523 group_sid = beg + total_len;
4524 sid_len = posix_info_sid_size(group_sid, end);
4525 if (sid_len < 0)
4526 return -1;
4527 total_len += sid_len;
4528
4529 /* check name len */
4530 if (beg + total_len + 4 > end)
4531 return -1;
4532 name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4533 if (name_len < 1 || name_len > 0xFFFF)
4534 return -1;
4535 total_len += 4;
4536
4537 /* check name */
4538 name = beg + total_len;
4539 if (name + name_len > end)
4540 return -1;
4541 total_len += name_len;
4542
4543 if (out) {
4544 out->base = beg;
4545 out->size = total_len;
4546 out->name_len = name_len;
4547 out->name = name;
4548 memcpy(&out->owner, owner_sid,
4549 posix_info_sid_size(owner_sid, end));
4550 memcpy(&out->group, group_sid,
4551 posix_info_sid_size(group_sid, end));
4552 }
4553 return total_len;
4554 }
4555
posix_info_extra_size(const void * beg,const void * end)4556 static int posix_info_extra_size(const void *beg, const void *end)
4557 {
4558 int len = posix_info_parse(beg, end, NULL);
4559
4560 if (len < 0)
4561 return -1;
4562 return len - sizeof(struct smb2_posix_info);
4563 }
4564
4565 static unsigned int
num_entries(int infotype,char * bufstart,char * end_of_buf,char ** lastentry,size_t size)4566 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4567 size_t size)
4568 {
4569 int len;
4570 unsigned int entrycount = 0;
4571 unsigned int next_offset = 0;
4572 char *entryptr;
4573 FILE_DIRECTORY_INFO *dir_info;
4574
4575 if (bufstart == NULL)
4576 return 0;
4577
4578 entryptr = bufstart;
4579
4580 while (1) {
4581 if (entryptr + next_offset < entryptr ||
4582 entryptr + next_offset > end_of_buf ||
4583 entryptr + next_offset + size > end_of_buf) {
4584 cifs_dbg(VFS, "malformed search entry would overflow\n");
4585 break;
4586 }
4587
4588 entryptr = entryptr + next_offset;
4589 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4590
4591 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4592 len = posix_info_extra_size(entryptr, end_of_buf);
4593 else
4594 len = le32_to_cpu(dir_info->FileNameLength);
4595
4596 if (len < 0 ||
4597 entryptr + len < entryptr ||
4598 entryptr + len > end_of_buf ||
4599 entryptr + len + size > end_of_buf) {
4600 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4601 end_of_buf);
4602 break;
4603 }
4604
4605 *lastentry = entryptr;
4606 entrycount++;
4607
4608 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4609 if (!next_offset)
4610 break;
4611 }
4612
4613 return entrycount;
4614 }
4615
4616 /*
4617 * Readdir/FindFirst
4618 */
SMB2_query_directory_init(const unsigned int xid,struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,int index,int info_level)4619 int SMB2_query_directory_init(const unsigned int xid,
4620 struct cifs_tcon *tcon,
4621 struct TCP_Server_Info *server,
4622 struct smb_rqst *rqst,
4623 u64 persistent_fid, u64 volatile_fid,
4624 int index, int info_level)
4625 {
4626 struct smb2_query_directory_req *req;
4627 unsigned char *bufptr;
4628 __le16 asteriks = cpu_to_le16('*');
4629 unsigned int output_size = CIFSMaxBufSize -
4630 MAX_SMB2_CREATE_RESPONSE_SIZE -
4631 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4632 unsigned int total_len;
4633 struct kvec *iov = rqst->rq_iov;
4634 int len, rc;
4635
4636 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4637 (void **) &req, &total_len);
4638 if (rc)
4639 return rc;
4640
4641 switch (info_level) {
4642 case SMB_FIND_FILE_DIRECTORY_INFO:
4643 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4644 break;
4645 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4646 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4647 break;
4648 case SMB_FIND_FILE_POSIX_INFO:
4649 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4650 break;
4651 default:
4652 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4653 info_level);
4654 return -EINVAL;
4655 }
4656
4657 req->FileIndex = cpu_to_le32(index);
4658 req->PersistentFileId = persistent_fid;
4659 req->VolatileFileId = volatile_fid;
4660
4661 len = 0x2;
4662 bufptr = req->Buffer;
4663 memcpy(bufptr, &asteriks, len);
4664
4665 req->FileNameOffset =
4666 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4667 req->FileNameLength = cpu_to_le16(len);
4668 /*
4669 * BB could be 30 bytes or so longer if we used SMB2 specific
4670 * buffer lengths, but this is safe and close enough.
4671 */
4672 output_size = min_t(unsigned int, output_size, server->maxBuf);
4673 output_size = min_t(unsigned int, output_size, 2 << 15);
4674 req->OutputBufferLength = cpu_to_le32(output_size);
4675
4676 iov[0].iov_base = (char *)req;
4677 /* 1 for Buffer */
4678 iov[0].iov_len = total_len - 1;
4679
4680 iov[1].iov_base = (char *)(req->Buffer);
4681 iov[1].iov_len = len;
4682
4683 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4684 tcon->ses->Suid, index, output_size);
4685
4686 return 0;
4687 }
4688
SMB2_query_directory_free(struct smb_rqst * rqst)4689 void SMB2_query_directory_free(struct smb_rqst *rqst)
4690 {
4691 if (rqst && rqst->rq_iov) {
4692 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4693 }
4694 }
4695
4696 int
smb2_parse_query_directory(struct cifs_tcon * tcon,struct kvec * rsp_iov,int resp_buftype,struct cifs_search_info * srch_inf)4697 smb2_parse_query_directory(struct cifs_tcon *tcon,
4698 struct kvec *rsp_iov,
4699 int resp_buftype,
4700 struct cifs_search_info *srch_inf)
4701 {
4702 struct smb2_query_directory_rsp *rsp;
4703 size_t info_buf_size;
4704 char *end_of_smb;
4705 int rc;
4706
4707 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4708
4709 switch (srch_inf->info_level) {
4710 case SMB_FIND_FILE_DIRECTORY_INFO:
4711 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4712 break;
4713 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4714 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4715 break;
4716 case SMB_FIND_FILE_POSIX_INFO:
4717 /* note that posix payload are variable size */
4718 info_buf_size = sizeof(struct smb2_posix_info);
4719 break;
4720 default:
4721 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4722 srch_inf->info_level);
4723 return -EINVAL;
4724 }
4725
4726 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4727 le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4728 info_buf_size);
4729 if (rc) {
4730 cifs_tcon_dbg(VFS, "bad info payload");
4731 return rc;
4732 }
4733
4734 srch_inf->unicode = true;
4735
4736 if (srch_inf->ntwrk_buf_start) {
4737 if (srch_inf->smallBuf)
4738 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4739 else
4740 cifs_buf_release(srch_inf->ntwrk_buf_start);
4741 }
4742 srch_inf->ntwrk_buf_start = (char *)rsp;
4743 srch_inf->srch_entries_start = srch_inf->last_entry =
4744 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4745 end_of_smb = rsp_iov->iov_len + (char *)rsp;
4746
4747 srch_inf->entries_in_buffer = num_entries(
4748 srch_inf->info_level,
4749 srch_inf->srch_entries_start,
4750 end_of_smb,
4751 &srch_inf->last_entry,
4752 info_buf_size);
4753
4754 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4755 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4756 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4757 srch_inf->srch_entries_start, srch_inf->last_entry);
4758 if (resp_buftype == CIFS_LARGE_BUFFER)
4759 srch_inf->smallBuf = false;
4760 else if (resp_buftype == CIFS_SMALL_BUFFER)
4761 srch_inf->smallBuf = true;
4762 else
4763 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4764
4765 return 0;
4766 }
4767
4768 int
SMB2_query_directory(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int index,struct cifs_search_info * srch_inf)4769 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4770 u64 persistent_fid, u64 volatile_fid, int index,
4771 struct cifs_search_info *srch_inf)
4772 {
4773 struct smb_rqst rqst;
4774 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4775 struct smb2_query_directory_rsp *rsp = NULL;
4776 int resp_buftype = CIFS_NO_BUFFER;
4777 struct kvec rsp_iov;
4778 int rc = 0;
4779 struct cifs_ses *ses = tcon->ses;
4780 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4781 int flags = 0;
4782
4783 if (!ses || !(ses->server))
4784 return -EIO;
4785
4786 if (smb3_encryption_required(tcon))
4787 flags |= CIFS_TRANSFORM_REQ;
4788
4789 memset(&rqst, 0, sizeof(struct smb_rqst));
4790 memset(&iov, 0, sizeof(iov));
4791 rqst.rq_iov = iov;
4792 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4793
4794 rc = SMB2_query_directory_init(xid, tcon, server,
4795 &rqst, persistent_fid,
4796 volatile_fid, index,
4797 srch_inf->info_level);
4798 if (rc)
4799 goto qdir_exit;
4800
4801 rc = cifs_send_recv(xid, ses, server,
4802 &rqst, &resp_buftype, flags, &rsp_iov);
4803 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4804
4805 if (rc) {
4806 if (rc == -ENODATA &&
4807 rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4808 trace_smb3_query_dir_done(xid, persistent_fid,
4809 tcon->tid, tcon->ses->Suid, index, 0);
4810 srch_inf->endOfSearch = true;
4811 rc = 0;
4812 } else {
4813 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4814 tcon->ses->Suid, index, 0, rc);
4815 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4816 }
4817 goto qdir_exit;
4818 }
4819
4820 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4821 srch_inf);
4822 if (rc) {
4823 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4824 tcon->ses->Suid, index, 0, rc);
4825 goto qdir_exit;
4826 }
4827 resp_buftype = CIFS_NO_BUFFER;
4828
4829 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4830 tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4831
4832 qdir_exit:
4833 SMB2_query_directory_free(&rqst);
4834 free_rsp_buf(resp_buftype, rsp);
4835 return rc;
4836 }
4837
4838 int
SMB2_set_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,void ** data,unsigned int * size)4839 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4840 struct smb_rqst *rqst,
4841 u64 persistent_fid, u64 volatile_fid, u32 pid,
4842 u8 info_class, u8 info_type, u32 additional_info,
4843 void **data, unsigned int *size)
4844 {
4845 struct smb2_set_info_req *req;
4846 struct kvec *iov = rqst->rq_iov;
4847 unsigned int i, total_len;
4848 int rc;
4849
4850 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4851 (void **) &req, &total_len);
4852 if (rc)
4853 return rc;
4854
4855 req->sync_hdr.ProcessId = cpu_to_le32(pid);
4856 req->InfoType = info_type;
4857 req->FileInfoClass = info_class;
4858 req->PersistentFileId = persistent_fid;
4859 req->VolatileFileId = volatile_fid;
4860 req->AdditionalInformation = cpu_to_le32(additional_info);
4861
4862 req->BufferOffset =
4863 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4864 req->BufferLength = cpu_to_le32(*size);
4865
4866 memcpy(req->Buffer, *data, *size);
4867 total_len += *size;
4868
4869 iov[0].iov_base = (char *)req;
4870 /* 1 for Buffer */
4871 iov[0].iov_len = total_len - 1;
4872
4873 for (i = 1; i < rqst->rq_nvec; i++) {
4874 le32_add_cpu(&req->BufferLength, size[i]);
4875 iov[i].iov_base = (char *)data[i];
4876 iov[i].iov_len = size[i];
4877 }
4878
4879 return 0;
4880 }
4881
4882 void
SMB2_set_info_free(struct smb_rqst * rqst)4883 SMB2_set_info_free(struct smb_rqst *rqst)
4884 {
4885 if (rqst && rqst->rq_iov)
4886 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4887 }
4888
4889 static int
send_set_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,unsigned int num,void ** data,unsigned int * size)4890 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4891 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4892 u8 info_type, u32 additional_info, unsigned int num,
4893 void **data, unsigned int *size)
4894 {
4895 struct smb_rqst rqst;
4896 struct smb2_set_info_rsp *rsp = NULL;
4897 struct kvec *iov;
4898 struct kvec rsp_iov;
4899 int rc = 0;
4900 int resp_buftype;
4901 struct cifs_ses *ses = tcon->ses;
4902 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4903 int flags = 0;
4904
4905 if (!ses || !server)
4906 return -EIO;
4907
4908 if (!num)
4909 return -EINVAL;
4910
4911 if (smb3_encryption_required(tcon))
4912 flags |= CIFS_TRANSFORM_REQ;
4913
4914 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4915 if (!iov)
4916 return -ENOMEM;
4917
4918 memset(&rqst, 0, sizeof(struct smb_rqst));
4919 rqst.rq_iov = iov;
4920 rqst.rq_nvec = num;
4921
4922 rc = SMB2_set_info_init(tcon, server,
4923 &rqst, persistent_fid, volatile_fid, pid,
4924 info_class, info_type, additional_info,
4925 data, size);
4926 if (rc) {
4927 kfree(iov);
4928 return rc;
4929 }
4930
4931
4932 rc = cifs_send_recv(xid, ses, server,
4933 &rqst, &resp_buftype, flags,
4934 &rsp_iov);
4935 SMB2_set_info_free(&rqst);
4936 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4937
4938 if (rc != 0) {
4939 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4940 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4941 ses->Suid, info_class, (__u32)info_type, rc);
4942 }
4943
4944 free_rsp_buf(resp_buftype, rsp);
4945 kfree(iov);
4946 return rc;
4947 }
4948
4949 int
SMB2_set_eof(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,__le64 * eof)4950 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4951 u64 volatile_fid, u32 pid, __le64 *eof)
4952 {
4953 struct smb2_file_eof_info info;
4954 void *data;
4955 unsigned int size;
4956
4957 info.EndOfFile = *eof;
4958
4959 data = &info;
4960 size = sizeof(struct smb2_file_eof_info);
4961
4962 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4963 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4964 0, 1, &data, &size);
4965 }
4966
4967 int
SMB2_set_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct cifs_ntsd * pnntsd,int pacllen,int aclflag)4968 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4969 u64 persistent_fid, u64 volatile_fid,
4970 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4971 {
4972 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4973 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4974 1, (void **)&pnntsd, &pacllen);
4975 }
4976
4977 int
SMB2_set_ea(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_full_ea_info * buf,int len)4978 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4979 u64 persistent_fid, u64 volatile_fid,
4980 struct smb2_file_full_ea_info *buf, int len)
4981 {
4982 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4983 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4984 0, 1, (void **)&buf, &len);
4985 }
4986
4987 int
SMB2_oplock_break(const unsigned int xid,struct cifs_tcon * tcon,const u64 persistent_fid,const u64 volatile_fid,__u8 oplock_level)4988 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4989 const u64 persistent_fid, const u64 volatile_fid,
4990 __u8 oplock_level)
4991 {
4992 struct smb_rqst rqst;
4993 int rc;
4994 struct smb2_oplock_break *req = NULL;
4995 struct cifs_ses *ses = tcon->ses;
4996 struct TCP_Server_Info *server = cifs_pick_channel(ses);
4997 int flags = CIFS_OBREAK_OP;
4998 unsigned int total_len;
4999 struct kvec iov[1];
5000 struct kvec rsp_iov;
5001 int resp_buf_type;
5002
5003 cifs_dbg(FYI, "SMB2_oplock_break\n");
5004 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5005 (void **) &req, &total_len);
5006 if (rc)
5007 return rc;
5008
5009 if (smb3_encryption_required(tcon))
5010 flags |= CIFS_TRANSFORM_REQ;
5011
5012 req->VolatileFid = volatile_fid;
5013 req->PersistentFid = persistent_fid;
5014 req->OplockLevel = oplock_level;
5015 req->sync_hdr.CreditRequest = cpu_to_le16(1);
5016
5017 flags |= CIFS_NO_RSP_BUF;
5018
5019 iov[0].iov_base = (char *)req;
5020 iov[0].iov_len = total_len;
5021
5022 memset(&rqst, 0, sizeof(struct smb_rqst));
5023 rqst.rq_iov = iov;
5024 rqst.rq_nvec = 1;
5025
5026 rc = cifs_send_recv(xid, ses, server,
5027 &rqst, &resp_buf_type, flags, &rsp_iov);
5028 cifs_small_buf_release(req);
5029
5030 if (rc) {
5031 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5032 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5033 }
5034
5035 return rc;
5036 }
5037
5038 void
smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info * pfs_inf,struct kstatfs * kst)5039 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5040 struct kstatfs *kst)
5041 {
5042 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5043 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5044 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5045 kst->f_bfree = kst->f_bavail =
5046 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5047 return;
5048 }
5049
5050 static void
copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO * response_data,struct kstatfs * kst)5051 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5052 struct kstatfs *kst)
5053 {
5054 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5055 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5056 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
5057 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5058 kst->f_bavail = kst->f_bfree;
5059 else
5060 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5061 if (response_data->TotalFileNodes != cpu_to_le64(-1))
5062 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5063 if (response_data->FreeFileNodes != cpu_to_le64(-1))
5064 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5065
5066 return;
5067 }
5068
5069 static int
build_qfs_info_req(struct kvec * iov,struct cifs_tcon * tcon,struct TCP_Server_Info * server,int level,int outbuf_len,u64 persistent_fid,u64 volatile_fid)5070 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5071 struct TCP_Server_Info *server,
5072 int level, int outbuf_len, u64 persistent_fid,
5073 u64 volatile_fid)
5074 {
5075 int rc;
5076 struct smb2_query_info_req *req;
5077 unsigned int total_len;
5078
5079 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5080
5081 if ((tcon->ses == NULL) || server == NULL)
5082 return -EIO;
5083
5084 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5085 (void **) &req, &total_len);
5086 if (rc)
5087 return rc;
5088
5089 req->InfoType = SMB2_O_INFO_FILESYSTEM;
5090 req->FileInfoClass = level;
5091 req->PersistentFileId = persistent_fid;
5092 req->VolatileFileId = volatile_fid;
5093 /* 1 for pad */
5094 req->InputBufferOffset =
5095 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5096 req->OutputBufferLength = cpu_to_le32(
5097 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5098
5099 iov->iov_base = (char *)req;
5100 iov->iov_len = total_len;
5101 return 0;
5102 }
5103
5104 int
SMB311_posix_qfs_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5105 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5106 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5107 {
5108 struct smb_rqst rqst;
5109 struct smb2_query_info_rsp *rsp = NULL;
5110 struct kvec iov;
5111 struct kvec rsp_iov;
5112 int rc = 0;
5113 int resp_buftype;
5114 struct cifs_ses *ses = tcon->ses;
5115 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5116 FILE_SYSTEM_POSIX_INFO *info = NULL;
5117 int flags = 0;
5118
5119 rc = build_qfs_info_req(&iov, tcon, server,
5120 FS_POSIX_INFORMATION,
5121 sizeof(FILE_SYSTEM_POSIX_INFO),
5122 persistent_fid, volatile_fid);
5123 if (rc)
5124 return rc;
5125
5126 if (smb3_encryption_required(tcon))
5127 flags |= CIFS_TRANSFORM_REQ;
5128
5129 memset(&rqst, 0, sizeof(struct smb_rqst));
5130 rqst.rq_iov = &iov;
5131 rqst.rq_nvec = 1;
5132
5133 rc = cifs_send_recv(xid, ses, server,
5134 &rqst, &resp_buftype, flags, &rsp_iov);
5135 cifs_small_buf_release(iov.iov_base);
5136 if (rc) {
5137 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5138 goto posix_qfsinf_exit;
5139 }
5140 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5141
5142 info = (FILE_SYSTEM_POSIX_INFO *)(
5143 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5144 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5145 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5146 sizeof(FILE_SYSTEM_POSIX_INFO));
5147 if (!rc)
5148 copy_posix_fs_info_to_kstatfs(info, fsdata);
5149
5150 posix_qfsinf_exit:
5151 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5152 return rc;
5153 }
5154
5155 int
SMB2_QFS_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5156 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5157 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5158 {
5159 struct smb_rqst rqst;
5160 struct smb2_query_info_rsp *rsp = NULL;
5161 struct kvec iov;
5162 struct kvec rsp_iov;
5163 int rc = 0;
5164 int resp_buftype;
5165 struct cifs_ses *ses = tcon->ses;
5166 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5167 struct smb2_fs_full_size_info *info = NULL;
5168 int flags = 0;
5169
5170 rc = build_qfs_info_req(&iov, tcon, server,
5171 FS_FULL_SIZE_INFORMATION,
5172 sizeof(struct smb2_fs_full_size_info),
5173 persistent_fid, volatile_fid);
5174 if (rc)
5175 return rc;
5176
5177 if (smb3_encryption_required(tcon))
5178 flags |= CIFS_TRANSFORM_REQ;
5179
5180 memset(&rqst, 0, sizeof(struct smb_rqst));
5181 rqst.rq_iov = &iov;
5182 rqst.rq_nvec = 1;
5183
5184 rc = cifs_send_recv(xid, ses, server,
5185 &rqst, &resp_buftype, flags, &rsp_iov);
5186 cifs_small_buf_release(iov.iov_base);
5187 if (rc) {
5188 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5189 goto qfsinf_exit;
5190 }
5191 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5192
5193 info = (struct smb2_fs_full_size_info *)(
5194 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5195 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5196 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5197 sizeof(struct smb2_fs_full_size_info));
5198 if (!rc)
5199 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5200
5201 qfsinf_exit:
5202 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5203 return rc;
5204 }
5205
5206 int
SMB2_QFS_attr(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int level)5207 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5208 u64 persistent_fid, u64 volatile_fid, int level)
5209 {
5210 struct smb_rqst rqst;
5211 struct smb2_query_info_rsp *rsp = NULL;
5212 struct kvec iov;
5213 struct kvec rsp_iov;
5214 int rc = 0;
5215 int resp_buftype, max_len, min_len;
5216 struct cifs_ses *ses = tcon->ses;
5217 struct TCP_Server_Info *server = cifs_pick_channel(ses);
5218 unsigned int rsp_len, offset;
5219 int flags = 0;
5220
5221 if (level == FS_DEVICE_INFORMATION) {
5222 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5223 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5224 } else if (level == FS_ATTRIBUTE_INFORMATION) {
5225 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5226 min_len = MIN_FS_ATTR_INFO_SIZE;
5227 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5228 max_len = sizeof(struct smb3_fs_ss_info);
5229 min_len = sizeof(struct smb3_fs_ss_info);
5230 } else if (level == FS_VOLUME_INFORMATION) {
5231 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5232 min_len = sizeof(struct smb3_fs_vol_info);
5233 } else {
5234 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5235 return -EINVAL;
5236 }
5237
5238 rc = build_qfs_info_req(&iov, tcon, server,
5239 level, max_len,
5240 persistent_fid, volatile_fid);
5241 if (rc)
5242 return rc;
5243
5244 if (smb3_encryption_required(tcon))
5245 flags |= CIFS_TRANSFORM_REQ;
5246
5247 memset(&rqst, 0, sizeof(struct smb_rqst));
5248 rqst.rq_iov = &iov;
5249 rqst.rq_nvec = 1;
5250
5251 rc = cifs_send_recv(xid, ses, server,
5252 &rqst, &resp_buftype, flags, &rsp_iov);
5253 cifs_small_buf_release(iov.iov_base);
5254 if (rc) {
5255 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5256 goto qfsattr_exit;
5257 }
5258 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5259
5260 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5261 offset = le16_to_cpu(rsp->OutputBufferOffset);
5262 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5263 if (rc)
5264 goto qfsattr_exit;
5265
5266 if (level == FS_ATTRIBUTE_INFORMATION)
5267 memcpy(&tcon->fsAttrInfo, offset
5268 + (char *)rsp, min_t(unsigned int,
5269 rsp_len, max_len));
5270 else if (level == FS_DEVICE_INFORMATION)
5271 memcpy(&tcon->fsDevInfo, offset
5272 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5273 else if (level == FS_SECTOR_SIZE_INFORMATION) {
5274 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5275 (offset + (char *)rsp);
5276 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5277 tcon->perf_sector_size =
5278 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5279 } else if (level == FS_VOLUME_INFORMATION) {
5280 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5281 (offset + (char *)rsp);
5282 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5283 tcon->vol_create_time = vol_info->VolumeCreationTime;
5284 }
5285
5286 qfsattr_exit:
5287 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5288 return rc;
5289 }
5290
5291 int
smb2_lockv(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u32 num_lock,struct smb2_lock_element * buf)5292 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5293 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5294 const __u32 num_lock, struct smb2_lock_element *buf)
5295 {
5296 struct smb_rqst rqst;
5297 int rc = 0;
5298 struct smb2_lock_req *req = NULL;
5299 struct kvec iov[2];
5300 struct kvec rsp_iov;
5301 int resp_buf_type;
5302 unsigned int count;
5303 int flags = CIFS_NO_RSP_BUF;
5304 unsigned int total_len;
5305 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5306
5307 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5308
5309 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5310 (void **) &req, &total_len);
5311 if (rc)
5312 return rc;
5313
5314 if (smb3_encryption_required(tcon))
5315 flags |= CIFS_TRANSFORM_REQ;
5316
5317 req->sync_hdr.ProcessId = cpu_to_le32(pid);
5318 req->LockCount = cpu_to_le16(num_lock);
5319
5320 req->PersistentFileId = persist_fid;
5321 req->VolatileFileId = volatile_fid;
5322
5323 count = num_lock * sizeof(struct smb2_lock_element);
5324
5325 iov[0].iov_base = (char *)req;
5326 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5327 iov[1].iov_base = (char *)buf;
5328 iov[1].iov_len = count;
5329
5330 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5331
5332 memset(&rqst, 0, sizeof(struct smb_rqst));
5333 rqst.rq_iov = iov;
5334 rqst.rq_nvec = 2;
5335
5336 rc = cifs_send_recv(xid, tcon->ses, server,
5337 &rqst, &resp_buf_type, flags,
5338 &rsp_iov);
5339 cifs_small_buf_release(req);
5340 if (rc) {
5341 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5342 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5343 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5344 tcon->ses->Suid, rc);
5345 }
5346
5347 return rc;
5348 }
5349
5350 int
SMB2_lock(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u64 length,const __u64 offset,const __u32 lock_flags,const bool wait)5351 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5352 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5353 const __u64 length, const __u64 offset, const __u32 lock_flags,
5354 const bool wait)
5355 {
5356 struct smb2_lock_element lock;
5357
5358 lock.Offset = cpu_to_le64(offset);
5359 lock.Length = cpu_to_le64(length);
5360 lock.Flags = cpu_to_le32(lock_flags);
5361 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5362 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5363
5364 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5365 }
5366
5367 int
SMB2_lease_break(const unsigned int xid,struct cifs_tcon * tcon,__u8 * lease_key,const __le32 lease_state)5368 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5369 __u8 *lease_key, const __le32 lease_state)
5370 {
5371 struct smb_rqst rqst;
5372 int rc;
5373 struct smb2_lease_ack *req = NULL;
5374 struct cifs_ses *ses = tcon->ses;
5375 int flags = CIFS_OBREAK_OP;
5376 unsigned int total_len;
5377 struct kvec iov[1];
5378 struct kvec rsp_iov;
5379 int resp_buf_type;
5380 __u64 *please_key_high;
5381 __u64 *please_key_low;
5382 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5383
5384 cifs_dbg(FYI, "SMB2_lease_break\n");
5385 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5386 (void **) &req, &total_len);
5387 if (rc)
5388 return rc;
5389
5390 if (smb3_encryption_required(tcon))
5391 flags |= CIFS_TRANSFORM_REQ;
5392
5393 req->sync_hdr.CreditRequest = cpu_to_le16(1);
5394 req->StructureSize = cpu_to_le16(36);
5395 total_len += 12;
5396
5397 memcpy(req->LeaseKey, lease_key, 16);
5398 req->LeaseState = lease_state;
5399
5400 flags |= CIFS_NO_RSP_BUF;
5401
5402 iov[0].iov_base = (char *)req;
5403 iov[0].iov_len = total_len;
5404
5405 memset(&rqst, 0, sizeof(struct smb_rqst));
5406 rqst.rq_iov = iov;
5407 rqst.rq_nvec = 1;
5408
5409 rc = cifs_send_recv(xid, ses, server,
5410 &rqst, &resp_buf_type, flags, &rsp_iov);
5411 cifs_small_buf_release(req);
5412
5413 please_key_low = (__u64 *)lease_key;
5414 please_key_high = (__u64 *)(lease_key+8);
5415 if (rc) {
5416 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5417 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5418 ses->Suid, *please_key_low, *please_key_high, rc);
5419 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5420 } else
5421 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5422 ses->Suid, *please_key_low, *please_key_high);
5423
5424 return rc;
5425 }
5426