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userns,pidns: Verify the userns for new pid namespaces
[cris-mirror.git] / fs / cifs / smb2pdu.c
blob5fb2fc2d0080b6e62fd0ad10e1a9c90c08308f2d
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
52 /*
53 * The following table defines the expected "StructureSize" of SMB2 requests
54 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
55 *
56 * Note that commands are defined in smb2pdu.h in le16 but the array below is
57 * indexed by command in host byte order.
58 */
59 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
60 /* SMB2_NEGOTIATE */ 36,
61 /* SMB2_SESSION_SETUP */ 25,
62 /* SMB2_LOGOFF */ 4,
63 /* SMB2_TREE_CONNECT */ 9,
64 /* SMB2_TREE_DISCONNECT */ 4,
65 /* SMB2_CREATE */ 57,
66 /* SMB2_CLOSE */ 24,
67 /* SMB2_FLUSH */ 24,
68 /* SMB2_READ */ 49,
69 /* SMB2_WRITE */ 49,
70 /* SMB2_LOCK */ 48,
71 /* SMB2_IOCTL */ 57,
72 /* SMB2_CANCEL */ 4,
73 /* SMB2_ECHO */ 4,
74 /* SMB2_QUERY_DIRECTORY */ 33,
75 /* SMB2_CHANGE_NOTIFY */ 32,
76 /* SMB2_QUERY_INFO */ 41,
77 /* SMB2_SET_INFO */ 33,
78 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
79 };
80
81 static int encryption_required(const struct cifs_tcon *tcon)
82 {
83 if (!tcon)
84 return 0;
85 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
86 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
87 return 1;
88 if (tcon->seal &&
89 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
90 return 1;
91 return 0;
92 }
93
94 static void
95 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
96 const struct cifs_tcon *tcon)
97 {
98 shdr->ProtocolId = SMB2_PROTO_NUMBER;
99 shdr->StructureSize = cpu_to_le16(64);
100 shdr->Command = smb2_cmd;
101 if (tcon && tcon->ses && tcon->ses->server) {
102 struct TCP_Server_Info *server = tcon->ses->server;
103
104 spin_lock(&server->req_lock);
105 /* Request up to 2 credits but don't go over the limit. */
106 if (server->credits >= server->max_credits)
107 shdr->CreditRequest = cpu_to_le16(0);
108 else
109 shdr->CreditRequest = cpu_to_le16(
110 min_t(int, server->max_credits -
111 server->credits, 2));
112 spin_unlock(&server->req_lock);
113 } else {
114 shdr->CreditRequest = cpu_to_le16(2);
115 }
116 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
117
118 if (!tcon)
119 goto out;
120
121 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
122 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
123 if ((tcon->ses) && (tcon->ses->server) &&
124 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
125 shdr->CreditCharge = cpu_to_le16(1);
126 /* else CreditCharge MBZ */
127
128 shdr->TreeId = tcon->tid;
129 /* Uid is not converted */
130 if (tcon->ses)
131 shdr->SessionId = tcon->ses->Suid;
132
133 /*
134 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
135 * to pass the path on the Open SMB prefixed by \\server\share.
136 * Not sure when we would need to do the augmented path (if ever) and
137 * setting this flag breaks the SMB2 open operation since it is
138 * illegal to send an empty path name (without \\server\share prefix)
139 * when the DFS flag is set in the SMB open header. We could
140 * consider setting the flag on all operations other than open
141 * but it is safer to net set it for now.
142 */
143 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
144 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
145
146 if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
147 !encryption_required(tcon))
148 shdr->Flags |= SMB2_FLAGS_SIGNED;
149 out:
150 return;
151 }
152
153 static int
154 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
155 {
156 int rc = 0;
157 struct nls_table *nls_codepage;
158 struct cifs_ses *ses;
159 struct TCP_Server_Info *server;
160
161 /*
162 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
163 * check for tcp and smb session status done differently
164 * for those three - in the calling routine.
165 */
166 if (tcon == NULL)
167 return rc;
168
169 if (smb2_command == SMB2_TREE_CONNECT)
170 return rc;
171
172 if (tcon->tidStatus == CifsExiting) {
173 /*
174 * only tree disconnect, open, and write,
175 * (and ulogoff which does not have tcon)
176 * are allowed as we start force umount.
177 */
178 if ((smb2_command != SMB2_WRITE) &&
179 (smb2_command != SMB2_CREATE) &&
180 (smb2_command != SMB2_TREE_DISCONNECT)) {
181 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
182 smb2_command);
183 return -ENODEV;
184 }
185 }
186 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
187 (!tcon->ses->server))
188 return -EIO;
189
190 ses = tcon->ses;
191 server = ses->server;
192
193 /*
194 * Give demultiplex thread up to 10 seconds to reconnect, should be
195 * greater than cifs socket timeout which is 7 seconds
196 */
197 while (server->tcpStatus == CifsNeedReconnect) {
198 /*
199 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
200 * here since they are implicitly done when session drops.
201 */
202 switch (smb2_command) {
203 /*
204 * BB Should we keep oplock break and add flush to exceptions?
205 */
206 case SMB2_TREE_DISCONNECT:
207 case SMB2_CANCEL:
208 case SMB2_CLOSE:
209 case SMB2_OPLOCK_BREAK:
210 return -EAGAIN;
211 }
212
213 wait_event_interruptible_timeout(server->response_q,
214 (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
215
216 /* are we still trying to reconnect? */
217 if (server->tcpStatus != CifsNeedReconnect)
218 break;
219
220 /*
221 * on "soft" mounts we wait once. Hard mounts keep
222 * retrying until process is killed or server comes
223 * back on-line
224 */
225 if (!tcon->retry) {
226 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
227 return -EHOSTDOWN;
228 }
229 }
230
231 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
232 return rc;
233
234 nls_codepage = load_nls_default();
235
236 /*
237 * need to prevent multiple threads trying to simultaneously reconnect
238 * the same SMB session
239 */
240 mutex_lock(&tcon->ses->session_mutex);
241 rc = cifs_negotiate_protocol(0, tcon->ses);
242 if (!rc && tcon->ses->need_reconnect)
243 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
244
245 if (rc || !tcon->need_reconnect) {
246 mutex_unlock(&tcon->ses->session_mutex);
247 goto out;
248 }
249
250 cifs_mark_open_files_invalid(tcon);
251 if (tcon->use_persistent)
252 tcon->need_reopen_files = true;
253
254 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
255 mutex_unlock(&tcon->ses->session_mutex);
256
257 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
258 if (rc)
259 goto out;
260
261 if (smb2_command != SMB2_INTERNAL_CMD)
262 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
263
264 atomic_inc(&tconInfoReconnectCount);
265 out:
266 /*
267 * Check if handle based operation so we know whether we can continue
268 * or not without returning to caller to reset file handle.
269 */
270 /*
271 * BB Is flush done by server on drop of tcp session? Should we special
272 * case it and skip above?
273 */
274 switch (smb2_command) {
275 case SMB2_FLUSH:
276 case SMB2_READ:
277 case SMB2_WRITE:
278 case SMB2_LOCK:
279 case SMB2_IOCTL:
280 case SMB2_QUERY_DIRECTORY:
281 case SMB2_CHANGE_NOTIFY:
282 case SMB2_QUERY_INFO:
283 case SMB2_SET_INFO:
284 rc = -EAGAIN;
285 }
286 unload_nls(nls_codepage);
287 return rc;
288 }
289
290 static void
291 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
292 unsigned int *total_len)
293 {
294 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
295 /* lookup word count ie StructureSize from table */
296 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
297
298 /*
299 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
300 * largest operations (Create)
301 */
302 memset(buf, 0, 256);
303
304 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
305 spdu->StructureSize2 = cpu_to_le16(parmsize);
306
307 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
308 }
309
310 /* init request without RFC1001 length at the beginning */
311 static int
312 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
313 void **request_buf, unsigned int *total_len)
314 {
315 int rc;
316 struct smb2_sync_hdr *shdr;
317
318 rc = smb2_reconnect(smb2_command, tcon);
319 if (rc)
320 return rc;
321
322 /* BB eventually switch this to SMB2 specific small buf size */
323 *request_buf = cifs_small_buf_get();
324 if (*request_buf == NULL) {
325 /* BB should we add a retry in here if not a writepage? */
326 return -ENOMEM;
327 }
328
329 shdr = (struct smb2_sync_hdr *)(*request_buf);
330
331 fill_small_buf(smb2_command, tcon, shdr, total_len);
332
333 if (tcon != NULL) {
334 #ifdef CONFIG_CIFS_STATS2
335 uint16_t com_code = le16_to_cpu(smb2_command);
336
337 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
338 #endif
339 cifs_stats_inc(&tcon->num_smbs_sent);
340 }
341
342 return rc;
343 }
344
345 /*
346 * Allocate and return pointer to an SMB request hdr, and set basic
347 * SMB information in the SMB header. If the return code is zero, this
348 * function must have filled in request_buf pointer. The returned buffer
349 * has RFC1001 length at the beginning.
350 */
351 static int
352 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
353 void **request_buf)
354 {
355 int rc;
356 unsigned int total_len;
357 struct smb2_pdu *pdu;
358
359 rc = smb2_reconnect(smb2_command, tcon);
360 if (rc)
361 return rc;
362
363 /* BB eventually switch this to SMB2 specific small buf size */
364 *request_buf = cifs_small_buf_get();
365 if (*request_buf == NULL) {
366 /* BB should we add a retry in here if not a writepage? */
367 return -ENOMEM;
368 }
369
370 pdu = (struct smb2_pdu *)(*request_buf);
371
372 fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
373
374 /* Note this is only network field converted to big endian */
375 pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
376
377 if (tcon != NULL) {
378 #ifdef CONFIG_CIFS_STATS2
379 uint16_t com_code = le16_to_cpu(smb2_command);
380 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
381 #endif
382 cifs_stats_inc(&tcon->num_smbs_sent);
383 }
384
385 return rc;
386 }
387
388 #ifdef CONFIG_CIFS_SMB311
389 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
390 #define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) - 4 */
391
392
393 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
394 #define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
395
396 static void
397 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
398 {
399 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
400 pneg_ctxt->DataLength = cpu_to_le16(38);
401 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
402 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
403 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
404 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
405 }
406
407 static void
408 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
409 {
410 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
411 pneg_ctxt->DataLength = cpu_to_le16(6);
412 pneg_ctxt->CipherCount = cpu_to_le16(2);
413 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
414 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
415 }
416
417 static void
418 assemble_neg_contexts(struct smb2_negotiate_req *req)
419 {
420
421 /* +4 is to account for the RFC1001 len field */
422 char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
423
424 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
425 /* Add 2 to size to round to 8 byte boundary */
426 pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
427 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
428 req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
429 req->NegotiateContextCount = cpu_to_le16(2);
430 inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
431 + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
432 }
433 #else
434 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
435 {
436 return;
437 }
438 #endif /* SMB311 */
439
440 /*
441 *
442 * SMB2 Worker functions follow:
443 *
444 * The general structure of the worker functions is:
445 * 1) Call smb2_init (assembles SMB2 header)
446 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
447 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
448 * 4) Decode SMB2 command specific fields in the fixed length area
449 * 5) Decode variable length data area (if any for this SMB2 command type)
450 * 6) Call free smb buffer
451 * 7) return
452 *
453 */
454
455 int
456 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
457 {
458 struct smb2_negotiate_req *req;
459 struct smb2_negotiate_rsp *rsp;
460 struct kvec iov[1];
461 struct kvec rsp_iov;
462 int rc = 0;
463 int resp_buftype;
464 struct TCP_Server_Info *server = ses->server;
465 int blob_offset, blob_length;
466 char *security_blob;
467 int flags = CIFS_NEG_OP;
468
469 cifs_dbg(FYI, "Negotiate protocol\n");
470
471 if (!server) {
472 WARN(1, "%s: server is NULL!\n", __func__);
473 return -EIO;
474 }
475
476 rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
477 if (rc)
478 return rc;
479
480 req->hdr.sync_hdr.SessionId = 0;
481
482 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
483
484 req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
485 inc_rfc1001_len(req, 2);
486
487 /* only one of SMB2 signing flags may be set in SMB2 request */
488 if (ses->sign)
489 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
490 else if (global_secflags & CIFSSEC_MAY_SIGN)
491 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
492 else
493 req->SecurityMode = 0;
494
495 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
496
497 /* ClientGUID must be zero for SMB2.02 dialect */
498 if (ses->server->vals->protocol_id == SMB20_PROT_ID)
499 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
500 else {
501 memcpy(req->ClientGUID, server->client_guid,
502 SMB2_CLIENT_GUID_SIZE);
503 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
504 assemble_neg_contexts(req);
505 }
506 iov[0].iov_base = (char *)req;
507 /* 4 for rfc1002 length field */
508 iov[0].iov_len = get_rfc1002_length(req) + 4;
509
510 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
511 cifs_small_buf_release(req);
512 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
513 /*
514 * No tcon so can't do
515 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
516 */
517 if (rc != 0)
518 goto neg_exit;
519
520 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
521
522 /* BB we may eventually want to match the negotiated vs. requested
523 dialect, even though we are only requesting one at a time */
524 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
525 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
526 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
527 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
528 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
529 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
530 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
531 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
532 #ifdef CONFIG_CIFS_SMB311
533 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
534 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
535 #endif /* SMB311 */
536 else {
537 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
538 le16_to_cpu(rsp->DialectRevision));
539 rc = -EIO;
540 goto neg_exit;
541 }
542 server->dialect = le16_to_cpu(rsp->DialectRevision);
543
544 /* SMB2 only has an extended negflavor */
545 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
546 /* set it to the maximum buffer size value we can send with 1 credit */
547 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
548 SMB2_MAX_BUFFER_SIZE);
549 server->max_read = le32_to_cpu(rsp->MaxReadSize);
550 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
551 /* BB Do we need to validate the SecurityMode? */
552 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
553 server->capabilities = le32_to_cpu(rsp->Capabilities);
554 /* Internal types */
555 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
556
557 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
558 &rsp->hdr);
559 /*
560 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
561 * for us will be
562 * ses->sectype = RawNTLMSSP;
563 * but for time being this is our only auth choice so doesn't matter.
564 * We just found a server which sets blob length to zero expecting raw.
565 */
566 if (blob_length == 0) {
567 cifs_dbg(FYI, "missing security blob on negprot\n");
568 server->sec_ntlmssp = true;
569 }
570
571 rc = cifs_enable_signing(server, ses->sign);
572 if (rc)
573 goto neg_exit;
574 if (blob_length) {
575 rc = decode_negTokenInit(security_blob, blob_length, server);
576 if (rc == 1)
577 rc = 0;
578 else if (rc == 0)
579 rc = -EIO;
580 }
581 neg_exit:
582 free_rsp_buf(resp_buftype, rsp);
583 return rc;
584 }
585
586 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
587 {
588 int rc = 0;
589 struct validate_negotiate_info_req vneg_inbuf;
590 struct validate_negotiate_info_rsp *pneg_rsp;
591 u32 rsplen;
592
593 cifs_dbg(FYI, "validate negotiate\n");
594
595 /*
596 * validation ioctl must be signed, so no point sending this if we
597 * can not sign it. We could eventually change this to selectively
598 * sign just this, the first and only signed request on a connection.
599 * This is good enough for now since a user who wants better security
600 * would also enable signing on the mount. Having validation of
601 * negotiate info for signed connections helps reduce attack vectors
602 */
603 if (tcon->ses->server->sign == false)
604 return 0; /* validation requires signing */
605
606 vneg_inbuf.Capabilities =
607 cpu_to_le32(tcon->ses->server->vals->req_capabilities);
608 memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
609 SMB2_CLIENT_GUID_SIZE);
610
611 if (tcon->ses->sign)
612 vneg_inbuf.SecurityMode =
613 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
614 else if (global_secflags & CIFSSEC_MAY_SIGN)
615 vneg_inbuf.SecurityMode =
616 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
617 else
618 vneg_inbuf.SecurityMode = 0;
619
620 vneg_inbuf.DialectCount = cpu_to_le16(1);
621 vneg_inbuf.Dialects[0] =
622 cpu_to_le16(tcon->ses->server->vals->protocol_id);
623
624 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
625 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
626 false /* use_ipc */,
627 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
628 (char **)&pneg_rsp, &rsplen);
629
630 if (rc != 0) {
631 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
632 return -EIO;
633 }
634
635 if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
636 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
637 rsplen);
638
639 /* relax check since Mac returns max bufsize allowed on ioctl */
640 if (rsplen > CIFSMaxBufSize)
641 return -EIO;
642 }
643
644 /* check validate negotiate info response matches what we got earlier */
645 if (pneg_rsp->Dialect !=
646 cpu_to_le16(tcon->ses->server->vals->protocol_id))
647 goto vneg_out;
648
649 if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
650 goto vneg_out;
651
652 /* do not validate server guid because not saved at negprot time yet */
653
654 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
655 SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
656 goto vneg_out;
657
658 /* validate negotiate successful */
659 cifs_dbg(FYI, "validate negotiate info successful\n");
660 return 0;
661
662 vneg_out:
663 cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
664 return -EIO;
665 }
666
667 enum securityEnum
668 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
669 {
670 switch (requested) {
671 case Kerberos:
672 case RawNTLMSSP:
673 return requested;
674 case NTLMv2:
675 return RawNTLMSSP;
676 case Unspecified:
677 if (server->sec_ntlmssp &&
678 (global_secflags & CIFSSEC_MAY_NTLMSSP))
679 return RawNTLMSSP;
680 if ((server->sec_kerberos || server->sec_mskerberos) &&
681 (global_secflags & CIFSSEC_MAY_KRB5))
682 return Kerberos;
683 /* Fallthrough */
684 default:
685 return Unspecified;
686 }
687 }
688
689 struct SMB2_sess_data {
690 unsigned int xid;
691 struct cifs_ses *ses;
692 struct nls_table *nls_cp;
693 void (*func)(struct SMB2_sess_data *);
694 int result;
695 u64 previous_session;
696
697 /* we will send the SMB in three pieces:
698 * a fixed length beginning part, an optional
699 * SPNEGO blob (which can be zero length), and a
700 * last part which will include the strings
701 * and rest of bcc area. This allows us to avoid
702 * a large buffer 17K allocation
703 */
704 int buf0_type;
705 struct kvec iov[2];
706 };
707
708 static int
709 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
710 {
711 int rc;
712 struct cifs_ses *ses = sess_data->ses;
713 struct smb2_sess_setup_req *req;
714 struct TCP_Server_Info *server = ses->server;
715
716 rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
717 if (rc)
718 return rc;
719
720 /* First session, not a reauthenticate */
721 req->hdr.sync_hdr.SessionId = 0;
722
723 /* if reconnect, we need to send previous sess id, otherwise it is 0 */
724 req->PreviousSessionId = sess_data->previous_session;
725
726 req->Flags = 0; /* MBZ */
727 /* to enable echos and oplocks */
728 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
729
730 /* only one of SMB2 signing flags may be set in SMB2 request */
731 if (server->sign)
732 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
733 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
734 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
735 else
736 req->SecurityMode = 0;
737
738 req->Capabilities = 0;
739 req->Channel = 0; /* MBZ */
740
741 sess_data->iov[0].iov_base = (char *)req;
742 /* 4 for rfc1002 length field and 1 for pad */
743 sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
744 /*
745 * This variable will be used to clear the buffer
746 * allocated above in case of any error in the calling function.
747 */
748 sess_data->buf0_type = CIFS_SMALL_BUFFER;
749
750 return 0;
751 }
752
753 static void
754 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
755 {
756 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
757 sess_data->buf0_type = CIFS_NO_BUFFER;
758 }
759
760 static int
761 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
762 {
763 int rc;
764 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
765 struct kvec rsp_iov = { NULL, 0 };
766
767 /* Testing shows that buffer offset must be at location of Buffer[0] */
768 req->SecurityBufferOffset =
769 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
770 1 /* pad */ - 4 /* rfc1001 len */);
771 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
772
773 inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
774
775 /* BB add code to build os and lm fields */
776
777 rc = SendReceive2(sess_data->xid, sess_data->ses,
778 sess_data->iov, 2,
779 &sess_data->buf0_type,
780 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
781 cifs_small_buf_release(sess_data->iov[0].iov_base);
782 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
783
784 return rc;
785 }
786
787 static int
788 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
789 {
790 int rc = 0;
791 struct cifs_ses *ses = sess_data->ses;
792
793 mutex_lock(&ses->server->srv_mutex);
794 if (ses->server->ops->generate_signingkey) {
795 rc = ses->server->ops->generate_signingkey(ses);
796 if (rc) {
797 cifs_dbg(FYI,
798 "SMB3 session key generation failed\n");
799 mutex_unlock(&ses->server->srv_mutex);
800 return rc;
801 }
802 }
803 if (!ses->server->session_estab) {
804 ses->server->sequence_number = 0x2;
805 ses->server->session_estab = true;
806 }
807 mutex_unlock(&ses->server->srv_mutex);
808
809 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
810 spin_lock(&GlobalMid_Lock);
811 ses->status = CifsGood;
812 ses->need_reconnect = false;
813 spin_unlock(&GlobalMid_Lock);
814 return rc;
815 }
816
817 #ifdef CONFIG_CIFS_UPCALL
818 static void
819 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
820 {
821 int rc;
822 struct cifs_ses *ses = sess_data->ses;
823 struct cifs_spnego_msg *msg;
824 struct key *spnego_key = NULL;
825 struct smb2_sess_setup_rsp *rsp = NULL;
826
827 rc = SMB2_sess_alloc_buffer(sess_data);
828 if (rc)
829 goto out;
830
831 spnego_key = cifs_get_spnego_key(ses);
832 if (IS_ERR(spnego_key)) {
833 rc = PTR_ERR(spnego_key);
834 spnego_key = NULL;
835 goto out;
836 }
837
838 msg = spnego_key->payload.data[0];
839 /*
840 * check version field to make sure that cifs.upcall is
841 * sending us a response in an expected form
842 */
843 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
844 cifs_dbg(VFS,
845 "bad cifs.upcall version. Expected %d got %d",
846 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
847 rc = -EKEYREJECTED;
848 goto out_put_spnego_key;
849 }
850
851 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
852 GFP_KERNEL);
853 if (!ses->auth_key.response) {
854 cifs_dbg(VFS,
855 "Kerberos can't allocate (%u bytes) memory",
856 msg->sesskey_len);
857 rc = -ENOMEM;
858 goto out_put_spnego_key;
859 }
860 ses->auth_key.len = msg->sesskey_len;
861
862 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
863 sess_data->iov[1].iov_len = msg->secblob_len;
864
865 rc = SMB2_sess_sendreceive(sess_data);
866 if (rc)
867 goto out_put_spnego_key;
868
869 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
870 ses->Suid = rsp->hdr.sync_hdr.SessionId;
871
872 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
873
874 rc = SMB2_sess_establish_session(sess_data);
875 out_put_spnego_key:
876 key_invalidate(spnego_key);
877 key_put(spnego_key);
878 out:
879 sess_data->result = rc;
880 sess_data->func = NULL;
881 SMB2_sess_free_buffer(sess_data);
882 }
883 #else
884 static void
885 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
886 {
887 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
888 sess_data->result = -EOPNOTSUPP;
889 sess_data->func = NULL;
890 }
891 #endif
892
893 static void
894 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
895
896 static void
897 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
898 {
899 int rc;
900 struct cifs_ses *ses = sess_data->ses;
901 struct smb2_sess_setup_rsp *rsp = NULL;
902 char *ntlmssp_blob = NULL;
903 bool use_spnego = false; /* else use raw ntlmssp */
904 u16 blob_length = 0;
905
906 /*
907 * If memory allocation is successful, caller of this function
908 * frees it.
909 */
910 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
911 if (!ses->ntlmssp) {
912 rc = -ENOMEM;
913 goto out_err;
914 }
915 ses->ntlmssp->sesskey_per_smbsess = true;
916
917 rc = SMB2_sess_alloc_buffer(sess_data);
918 if (rc)
919 goto out_err;
920
921 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
922 GFP_KERNEL);
923 if (ntlmssp_blob == NULL) {
924 rc = -ENOMEM;
925 goto out;
926 }
927
928 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
929 if (use_spnego) {
930 /* BB eventually need to add this */
931 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
932 rc = -EOPNOTSUPP;
933 goto out;
934 } else {
935 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
936 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
937 }
938 sess_data->iov[1].iov_base = ntlmssp_blob;
939 sess_data->iov[1].iov_len = blob_length;
940
941 rc = SMB2_sess_sendreceive(sess_data);
942 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
943
944 /* If true, rc here is expected and not an error */
945 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
946 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
947 rc = 0;
948
949 if (rc)
950 goto out;
951
952 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
953 le16_to_cpu(rsp->SecurityBufferOffset)) {
954 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
955 le16_to_cpu(rsp->SecurityBufferOffset));
956 rc = -EIO;
957 goto out;
958 }
959 rc = decode_ntlmssp_challenge(rsp->Buffer,
960 le16_to_cpu(rsp->SecurityBufferLength), ses);
961 if (rc)
962 goto out;
963
964 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
965
966
967 ses->Suid = rsp->hdr.sync_hdr.SessionId;
968 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
969
970 out:
971 kfree(ntlmssp_blob);
972 SMB2_sess_free_buffer(sess_data);
973 if (!rc) {
974 sess_data->result = 0;
975 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
976 return;
977 }
978 out_err:
979 kfree(ses->ntlmssp);
980 ses->ntlmssp = NULL;
981 sess_data->result = rc;
982 sess_data->func = NULL;
983 }
984
985 static void
986 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
987 {
988 int rc;
989 struct cifs_ses *ses = sess_data->ses;
990 struct smb2_sess_setup_req *req;
991 struct smb2_sess_setup_rsp *rsp = NULL;
992 unsigned char *ntlmssp_blob = NULL;
993 bool use_spnego = false; /* else use raw ntlmssp */
994 u16 blob_length = 0;
995
996 rc = SMB2_sess_alloc_buffer(sess_data);
997 if (rc)
998 goto out;
999
1000 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1001 req->hdr.sync_hdr.SessionId = ses->Suid;
1002
1003 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1004 sess_data->nls_cp);
1005 if (rc) {
1006 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1007 goto out;
1008 }
1009
1010 if (use_spnego) {
1011 /* BB eventually need to add this */
1012 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1013 rc = -EOPNOTSUPP;
1014 goto out;
1015 }
1016 sess_data->iov[1].iov_base = ntlmssp_blob;
1017 sess_data->iov[1].iov_len = blob_length;
1018
1019 rc = SMB2_sess_sendreceive(sess_data);
1020 if (rc)
1021 goto out;
1022
1023 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1024
1025 ses->Suid = rsp->hdr.sync_hdr.SessionId;
1026 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1027
1028 rc = SMB2_sess_establish_session(sess_data);
1029 out:
1030 kfree(ntlmssp_blob);
1031 SMB2_sess_free_buffer(sess_data);
1032 kfree(ses->ntlmssp);
1033 ses->ntlmssp = NULL;
1034 sess_data->result = rc;
1035 sess_data->func = NULL;
1036 }
1037
1038 static int
1039 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1040 {
1041 int type;
1042
1043 type = smb2_select_sectype(ses->server, ses->sectype);
1044 cifs_dbg(FYI, "sess setup type %d\n", type);
1045 if (type == Unspecified) {
1046 cifs_dbg(VFS,
1047 "Unable to select appropriate authentication method!");
1048 return -EINVAL;
1049 }
1050
1051 switch (type) {
1052 case Kerberos:
1053 sess_data->func = SMB2_auth_kerberos;
1054 break;
1055 case RawNTLMSSP:
1056 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1057 break;
1058 default:
1059 cifs_dbg(VFS, "secType %d not supported!\n", type);
1060 return -EOPNOTSUPP;
1061 }
1062
1063 return 0;
1064 }
1065
1066 int
1067 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1068 const struct nls_table *nls_cp)
1069 {
1070 int rc = 0;
1071 struct TCP_Server_Info *server = ses->server;
1072 struct SMB2_sess_data *sess_data;
1073
1074 cifs_dbg(FYI, "Session Setup\n");
1075
1076 if (!server) {
1077 WARN(1, "%s: server is NULL!\n", __func__);
1078 return -EIO;
1079 }
1080
1081 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1082 if (!sess_data)
1083 return -ENOMEM;
1084
1085 rc = SMB2_select_sec(ses, sess_data);
1086 if (rc)
1087 goto out;
1088 sess_data->xid = xid;
1089 sess_data->ses = ses;
1090 sess_data->buf0_type = CIFS_NO_BUFFER;
1091 sess_data->nls_cp = (struct nls_table *) nls_cp;
1092
1093 while (sess_data->func)
1094 sess_data->func(sess_data);
1095
1096 rc = sess_data->result;
1097 out:
1098 kfree(sess_data);
1099 return rc;
1100 }
1101
1102 int
1103 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1104 {
1105 struct smb2_logoff_req *req; /* response is also trivial struct */
1106 int rc = 0;
1107 struct TCP_Server_Info *server;
1108 int flags = 0;
1109
1110 cifs_dbg(FYI, "disconnect session %p\n", ses);
1111
1112 if (ses && (ses->server))
1113 server = ses->server;
1114 else
1115 return -EIO;
1116
1117 /* no need to send SMB logoff if uid already closed due to reconnect */
1118 if (ses->need_reconnect)
1119 goto smb2_session_already_dead;
1120
1121 rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1122 if (rc)
1123 return rc;
1124
1125 /* since no tcon, smb2_init can not do this, so do here */
1126 req->hdr.sync_hdr.SessionId = ses->Suid;
1127
1128 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1129 flags |= CIFS_TRANSFORM_REQ;
1130 else if (server->sign)
1131 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1132
1133 rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1134 cifs_small_buf_release(req);
1135 /*
1136 * No tcon so can't do
1137 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1138 */
1139
1140 smb2_session_already_dead:
1141 return rc;
1142 }
1143
1144 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1145 {
1146 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1147 }
1148
1149 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1150
1151 /* These are similar values to what Windows uses */
1152 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1153 {
1154 tcon->max_chunks = 256;
1155 tcon->max_bytes_chunk = 1048576;
1156 tcon->max_bytes_copy = 16777216;
1157 }
1158
1159 int
1160 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1161 struct cifs_tcon *tcon, const struct nls_table *cp)
1162 {
1163 struct smb2_tree_connect_req *req;
1164 struct smb2_tree_connect_rsp *rsp = NULL;
1165 struct kvec iov[2];
1166 struct kvec rsp_iov;
1167 int rc = 0;
1168 int resp_buftype;
1169 int unc_path_len;
1170 __le16 *unc_path = NULL;
1171 int flags = 0;
1172
1173 cifs_dbg(FYI, "TCON\n");
1174
1175 if (!(ses->server) || !tree)
1176 return -EIO;
1177
1178 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1179 if (unc_path == NULL)
1180 return -ENOMEM;
1181
1182 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1183 unc_path_len *= 2;
1184 if (unc_path_len < 2) {
1185 kfree(unc_path);
1186 return -EINVAL;
1187 }
1188
1189 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1190 if (tcon)
1191 tcon->tid = 0;
1192
1193 rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1194 if (rc) {
1195 kfree(unc_path);
1196 return rc;
1197 }
1198
1199 if (tcon == NULL) {
1200 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1201 flags |= CIFS_TRANSFORM_REQ;
1202
1203 /* since no tcon, smb2_init can not do this, so do here */
1204 req->hdr.sync_hdr.SessionId = ses->Suid;
1205 if (ses->server->sign)
1206 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1207 } else if (encryption_required(tcon))
1208 flags |= CIFS_TRANSFORM_REQ;
1209
1210 iov[0].iov_base = (char *)req;
1211 /* 4 for rfc1002 length field and 1 for pad */
1212 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1213
1214 /* Testing shows that buffer offset must be at location of Buffer[0] */
1215 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1216 - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1217 req->PathLength = cpu_to_le16(unc_path_len - 2);
1218 iov[1].iov_base = unc_path;
1219 iov[1].iov_len = unc_path_len;
1220
1221 inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1222
1223 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1224 cifs_small_buf_release(req);
1225 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1226
1227 if (rc != 0) {
1228 if (tcon) {
1229 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1230 tcon->need_reconnect = true;
1231 }
1232 goto tcon_error_exit;
1233 }
1234
1235 if (tcon == NULL) {
1236 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1237 goto tcon_exit;
1238 }
1239
1240 switch (rsp->ShareType) {
1241 case SMB2_SHARE_TYPE_DISK:
1242 cifs_dbg(FYI, "connection to disk share\n");
1243 break;
1244 case SMB2_SHARE_TYPE_PIPE:
1245 tcon->ipc = true;
1246 cifs_dbg(FYI, "connection to pipe share\n");
1247 break;
1248 case SMB2_SHARE_TYPE_PRINT:
1249 tcon->ipc = true;
1250 cifs_dbg(FYI, "connection to printer\n");
1251 break;
1252 default:
1253 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1254 rc = -EOPNOTSUPP;
1255 goto tcon_error_exit;
1256 }
1257
1258 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1259 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1260 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1261 tcon->tidStatus = CifsGood;
1262 tcon->need_reconnect = false;
1263 tcon->tid = rsp->hdr.sync_hdr.TreeId;
1264 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1265
1266 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1267 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1268 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1269
1270 if (tcon->seal &&
1271 !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1272 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1273
1274 init_copy_chunk_defaults(tcon);
1275 if (tcon->ses->server->ops->validate_negotiate)
1276 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1277 tcon_exit:
1278 free_rsp_buf(resp_buftype, rsp);
1279 kfree(unc_path);
1280 return rc;
1281
1282 tcon_error_exit:
1283 if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1284 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1285 }
1286 goto tcon_exit;
1287 }
1288
1289 int
1290 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1291 {
1292 struct smb2_tree_disconnect_req *req; /* response is trivial */
1293 int rc = 0;
1294 struct cifs_ses *ses = tcon->ses;
1295 int flags = 0;
1296
1297 cifs_dbg(FYI, "Tree Disconnect\n");
1298
1299 if (!ses || !(ses->server))
1300 return -EIO;
1301
1302 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1303 return 0;
1304
1305 rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1306 if (rc)
1307 return rc;
1308
1309 if (encryption_required(tcon))
1310 flags |= CIFS_TRANSFORM_REQ;
1311
1312 rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1313 cifs_small_buf_release(req);
1314 if (rc)
1315 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1316
1317 return rc;
1318 }
1319
1320
1321 static struct create_durable *
1322 create_durable_buf(void)
1323 {
1324 struct create_durable *buf;
1325
1326 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1327 if (!buf)
1328 return NULL;
1329
1330 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1331 (struct create_durable, Data));
1332 buf->ccontext.DataLength = cpu_to_le32(16);
1333 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1334 (struct create_durable, Name));
1335 buf->ccontext.NameLength = cpu_to_le16(4);
1336 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1337 buf->Name[0] = 'D';
1338 buf->Name[1] = 'H';
1339 buf->Name[2] = 'n';
1340 buf->Name[3] = 'Q';
1341 return buf;
1342 }
1343
1344 static struct create_durable *
1345 create_reconnect_durable_buf(struct cifs_fid *fid)
1346 {
1347 struct create_durable *buf;
1348
1349 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1350 if (!buf)
1351 return NULL;
1352
1353 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1354 (struct create_durable, Data));
1355 buf->ccontext.DataLength = cpu_to_le32(16);
1356 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1357 (struct create_durable, Name));
1358 buf->ccontext.NameLength = cpu_to_le16(4);
1359 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1360 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1361 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1362 buf->Name[0] = 'D';
1363 buf->Name[1] = 'H';
1364 buf->Name[2] = 'n';
1365 buf->Name[3] = 'C';
1366 return buf;
1367 }
1368
1369 static __u8
1370 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1371 unsigned int *epoch)
1372 {
1373 char *data_offset;
1374 struct create_context *cc;
1375 unsigned int next;
1376 unsigned int remaining;
1377 char *name;
1378
1379 data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1380 remaining = le32_to_cpu(rsp->CreateContextsLength);
1381 cc = (struct create_context *)data_offset;
1382 while (remaining >= sizeof(struct create_context)) {
1383 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1384 if (le16_to_cpu(cc->NameLength) == 4 &&
1385 strncmp(name, "RqLs", 4) == 0)
1386 return server->ops->parse_lease_buf(cc, epoch);
1387
1388 next = le32_to_cpu(cc->Next);
1389 if (!next)
1390 break;
1391 remaining -= next;
1392 cc = (struct create_context *)((char *)cc + next);
1393 }
1394
1395 return 0;
1396 }
1397
1398 static int
1399 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1400 unsigned int *num_iovec, __u8 *oplock)
1401 {
1402 struct smb2_create_req *req = iov[0].iov_base;
1403 unsigned int num = *num_iovec;
1404
1405 iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1406 if (iov[num].iov_base == NULL)
1407 return -ENOMEM;
1408 iov[num].iov_len = server->vals->create_lease_size;
1409 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1410 if (!req->CreateContextsOffset)
1411 req->CreateContextsOffset = cpu_to_le32(
1412 sizeof(struct smb2_create_req) - 4 +
1413 iov[num - 1].iov_len);
1414 le32_add_cpu(&req->CreateContextsLength,
1415 server->vals->create_lease_size);
1416 inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1417 *num_iovec = num + 1;
1418 return 0;
1419 }
1420
1421 static struct create_durable_v2 *
1422 create_durable_v2_buf(struct cifs_fid *pfid)
1423 {
1424 struct create_durable_v2 *buf;
1425
1426 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1427 if (!buf)
1428 return NULL;
1429
1430 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1431 (struct create_durable_v2, dcontext));
1432 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1433 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1434 (struct create_durable_v2, Name));
1435 buf->ccontext.NameLength = cpu_to_le16(4);
1436
1437 buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1438 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1439 generate_random_uuid(buf->dcontext.CreateGuid);
1440 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1441
1442 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1443 buf->Name[0] = 'D';
1444 buf->Name[1] = 'H';
1445 buf->Name[2] = '2';
1446 buf->Name[3] = 'Q';
1447 return buf;
1448 }
1449
1450 static struct create_durable_handle_reconnect_v2 *
1451 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1452 {
1453 struct create_durable_handle_reconnect_v2 *buf;
1454
1455 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1456 GFP_KERNEL);
1457 if (!buf)
1458 return NULL;
1459
1460 buf->ccontext.DataOffset =
1461 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1462 dcontext));
1463 buf->ccontext.DataLength =
1464 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1465 buf->ccontext.NameOffset =
1466 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1467 Name));
1468 buf->ccontext.NameLength = cpu_to_le16(4);
1469
1470 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1471 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1472 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1473 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1474
1475 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1476 buf->Name[0] = 'D';
1477 buf->Name[1] = 'H';
1478 buf->Name[2] = '2';
1479 buf->Name[3] = 'C';
1480 return buf;
1481 }
1482
1483 static int
1484 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1485 struct cifs_open_parms *oparms)
1486 {
1487 struct smb2_create_req *req = iov[0].iov_base;
1488 unsigned int num = *num_iovec;
1489
1490 iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1491 if (iov[num].iov_base == NULL)
1492 return -ENOMEM;
1493 iov[num].iov_len = sizeof(struct create_durable_v2);
1494 if (!req->CreateContextsOffset)
1495 req->CreateContextsOffset =
1496 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1497 iov[1].iov_len);
1498 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1499 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1500 *num_iovec = num + 1;
1501 return 0;
1502 }
1503
1504 static int
1505 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1506 struct cifs_open_parms *oparms)
1507 {
1508 struct smb2_create_req *req = iov[0].iov_base;
1509 unsigned int num = *num_iovec;
1510
1511 /* indicate that we don't need to relock the file */
1512 oparms->reconnect = false;
1513
1514 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1515 if (iov[num].iov_base == NULL)
1516 return -ENOMEM;
1517 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1518 if (!req->CreateContextsOffset)
1519 req->CreateContextsOffset =
1520 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1521 iov[1].iov_len);
1522 le32_add_cpu(&req->CreateContextsLength,
1523 sizeof(struct create_durable_handle_reconnect_v2));
1524 inc_rfc1001_len(&req->hdr,
1525 sizeof(struct create_durable_handle_reconnect_v2));
1526 *num_iovec = num + 1;
1527 return 0;
1528 }
1529
1530 static int
1531 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1532 struct cifs_open_parms *oparms, bool use_persistent)
1533 {
1534 struct smb2_create_req *req = iov[0].iov_base;
1535 unsigned int num = *num_iovec;
1536
1537 if (use_persistent) {
1538 if (oparms->reconnect)
1539 return add_durable_reconnect_v2_context(iov, num_iovec,
1540 oparms);
1541 else
1542 return add_durable_v2_context(iov, num_iovec, oparms);
1543 }
1544
1545 if (oparms->reconnect) {
1546 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1547 /* indicate that we don't need to relock the file */
1548 oparms->reconnect = false;
1549 } else
1550 iov[num].iov_base = create_durable_buf();
1551 if (iov[num].iov_base == NULL)
1552 return -ENOMEM;
1553 iov[num].iov_len = sizeof(struct create_durable);
1554 if (!req->CreateContextsOffset)
1555 req->CreateContextsOffset =
1556 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1557 iov[1].iov_len);
1558 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1559 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1560 *num_iovec = num + 1;
1561 return 0;
1562 }
1563
1564 static int
1565 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1566 const char *treename, const __le16 *path)
1567 {
1568 int treename_len, path_len;
1569 struct nls_table *cp;
1570 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1571
1572 /*
1573 * skip leading "\\"
1574 */
1575 treename_len = strlen(treename);
1576 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1577 return -EINVAL;
1578
1579 treename += 2;
1580 treename_len -= 2;
1581
1582 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1583
1584 /*
1585 * make room for one path separator between the treename and
1586 * path
1587 */
1588 *out_len = treename_len + 1 + path_len;
1589
1590 /*
1591 * final path needs to be null-terminated UTF16 with a
1592 * size aligned to 8
1593 */
1594
1595 *out_size = roundup((*out_len+1)*2, 8);
1596 *out_path = kzalloc(*out_size, GFP_KERNEL);
1597 if (!*out_path)
1598 return -ENOMEM;
1599
1600 cp = load_nls_default();
1601 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1602 UniStrcat(*out_path, sep);
1603 UniStrcat(*out_path, path);
1604 unload_nls(cp);
1605
1606 return 0;
1607 }
1608
1609 int
1610 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1611 __u8 *oplock, struct smb2_file_all_info *buf,
1612 struct smb2_err_rsp **err_buf)
1613 {
1614 struct smb2_create_req *req;
1615 struct smb2_create_rsp *rsp;
1616 struct TCP_Server_Info *server;
1617 struct cifs_tcon *tcon = oparms->tcon;
1618 struct cifs_ses *ses = tcon->ses;
1619 struct kvec iov[4];
1620 struct kvec rsp_iov;
1621 int resp_buftype;
1622 int uni_path_len;
1623 __le16 *copy_path = NULL;
1624 int copy_size;
1625 int rc = 0;
1626 unsigned int n_iov = 2;
1627 __u32 file_attributes = 0;
1628 char *dhc_buf = NULL, *lc_buf = NULL;
1629 int flags = 0;
1630
1631 cifs_dbg(FYI, "create/open\n");
1632
1633 if (ses && (ses->server))
1634 server = ses->server;
1635 else
1636 return -EIO;
1637
1638 rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1639 if (rc)
1640 return rc;
1641
1642 if (encryption_required(tcon))
1643 flags |= CIFS_TRANSFORM_REQ;
1644
1645 if (oparms->create_options & CREATE_OPTION_READONLY)
1646 file_attributes |= ATTR_READONLY;
1647 if (oparms->create_options & CREATE_OPTION_SPECIAL)
1648 file_attributes |= ATTR_SYSTEM;
1649
1650 req->ImpersonationLevel = IL_IMPERSONATION;
1651 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1652 /* File attributes ignored on open (used in create though) */
1653 req->FileAttributes = cpu_to_le32(file_attributes);
1654 req->ShareAccess = FILE_SHARE_ALL_LE;
1655 req->CreateDisposition = cpu_to_le32(oparms->disposition);
1656 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1657
1658 iov[0].iov_base = (char *)req;
1659 /* 4 for rfc1002 length field */
1660 iov[0].iov_len = get_rfc1002_length(req) + 4;
1661 /* -1 since last byte is buf[0] which is sent below (path) */
1662 iov[0].iov_len--;
1663
1664 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1665
1666 /* [MS-SMB2] 2.2.13 NameOffset:
1667 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1668 * the SMB2 header, the file name includes a prefix that will
1669 * be processed during DFS name normalization as specified in
1670 * section 3.3.5.9. Otherwise, the file name is relative to
1671 * the share that is identified by the TreeId in the SMB2
1672 * header.
1673 */
1674 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1675 int name_len;
1676
1677 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1678 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1679 &name_len,
1680 tcon->treeName, path);
1681 if (rc)
1682 return rc;
1683 req->NameLength = cpu_to_le16(name_len * 2);
1684 uni_path_len = copy_size;
1685 path = copy_path;
1686 } else {
1687 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1688 /* MUST set path len (NameLength) to 0 opening root of share */
1689 req->NameLength = cpu_to_le16(uni_path_len - 2);
1690 if (uni_path_len % 8 != 0) {
1691 copy_size = roundup(uni_path_len, 8);
1692 copy_path = kzalloc(copy_size, GFP_KERNEL);
1693 if (!copy_path)
1694 return -ENOMEM;
1695 memcpy((char *)copy_path, (const char *)path,
1696 uni_path_len);
1697 uni_path_len = copy_size;
1698 path = copy_path;
1699 }
1700 }
1701
1702 iov[1].iov_len = uni_path_len;
1703 iov[1].iov_base = path;
1704 /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1705 inc_rfc1001_len(req, uni_path_len - 1);
1706
1707 if (!server->oplocks)
1708 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1709
1710 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1711 *oplock == SMB2_OPLOCK_LEVEL_NONE)
1712 req->RequestedOplockLevel = *oplock;
1713 else {
1714 rc = add_lease_context(server, iov, &n_iov, oplock);
1715 if (rc) {
1716 cifs_small_buf_release(req);
1717 kfree(copy_path);
1718 return rc;
1719 }
1720 lc_buf = iov[n_iov-1].iov_base;
1721 }
1722
1723 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1724 /* need to set Next field of lease context if we request it */
1725 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1726 struct create_context *ccontext =
1727 (struct create_context *)iov[n_iov-1].iov_base;
1728 ccontext->Next =
1729 cpu_to_le32(server->vals->create_lease_size);
1730 }
1731
1732 rc = add_durable_context(iov, &n_iov, oparms,
1733 tcon->use_persistent);
1734 if (rc) {
1735 cifs_small_buf_release(req);
1736 kfree(copy_path);
1737 kfree(lc_buf);
1738 return rc;
1739 }
1740 dhc_buf = iov[n_iov-1].iov_base;
1741 }
1742
1743 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1744 cifs_small_buf_release(req);
1745 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1746
1747 if (rc != 0) {
1748 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1749 if (err_buf)
1750 *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1751 GFP_KERNEL);
1752 goto creat_exit;
1753 }
1754
1755 oparms->fid->persistent_fid = rsp->PersistentFileId;
1756 oparms->fid->volatile_fid = rsp->VolatileFileId;
1757
1758 if (buf) {
1759 memcpy(buf, &rsp->CreationTime, 32);
1760 buf->AllocationSize = rsp->AllocationSize;
1761 buf->EndOfFile = rsp->EndofFile;
1762 buf->Attributes = rsp->FileAttributes;
1763 buf->NumberOfLinks = cpu_to_le32(1);
1764 buf->DeletePending = 0;
1765 }
1766
1767 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1768 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1769 else
1770 *oplock = rsp->OplockLevel;
1771 creat_exit:
1772 kfree(copy_path);
1773 kfree(lc_buf);
1774 kfree(dhc_buf);
1775 free_rsp_buf(resp_buftype, rsp);
1776 return rc;
1777 }
1778
1779 /*
1780 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
1781 */
1782 int
1783 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1784 u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1785 char *in_data, u32 indatalen,
1786 char **out_data, u32 *plen /* returned data len */)
1787 {
1788 struct smb2_ioctl_req *req;
1789 struct smb2_ioctl_rsp *rsp;
1790 struct smb2_sync_hdr *shdr;
1791 struct cifs_ses *ses;
1792 struct kvec iov[2];
1793 struct kvec rsp_iov;
1794 int resp_buftype;
1795 int n_iov;
1796 int rc = 0;
1797 int flags = 0;
1798
1799 cifs_dbg(FYI, "SMB2 IOCTL\n");
1800
1801 if (out_data != NULL)
1802 *out_data = NULL;
1803
1804 /* zero out returned data len, in case of error */
1805 if (plen)
1806 *plen = 0;
1807
1808 if (tcon)
1809 ses = tcon->ses;
1810 else
1811 return -EIO;
1812
1813 if (!ses || !(ses->server))
1814 return -EIO;
1815
1816 rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1817 if (rc)
1818 return rc;
1819
1820 if (use_ipc) {
1821 if (ses->ipc_tid == 0) {
1822 cifs_small_buf_release(req);
1823 return -ENOTCONN;
1824 }
1825
1826 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1827 req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1828 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1829 }
1830 if (encryption_required(tcon))
1831 flags |= CIFS_TRANSFORM_REQ;
1832
1833 req->CtlCode = cpu_to_le32(opcode);
1834 req->PersistentFileId = persistent_fid;
1835 req->VolatileFileId = volatile_fid;
1836
1837 if (indatalen) {
1838 req->InputCount = cpu_to_le32(indatalen);
1839 /* do not set InputOffset if no input data */
1840 req->InputOffset =
1841 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1842 iov[1].iov_base = in_data;
1843 iov[1].iov_len = indatalen;
1844 n_iov = 2;
1845 } else
1846 n_iov = 1;
1847
1848 req->OutputOffset = 0;
1849 req->OutputCount = 0; /* MBZ */
1850
1851 /*
1852 * Could increase MaxOutputResponse, but that would require more
1853 * than one credit. Windows typically sets this smaller, but for some
1854 * ioctls it may be useful to allow server to send more. No point
1855 * limiting what the server can send as long as fits in one credit
1856 * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1857 * (by default, note that it can be overridden to make max larger)
1858 * in responses (except for read responses which can be bigger.
1859 * We may want to bump this limit up
1860 */
1861 req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1862
1863 if (is_fsctl)
1864 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1865 else
1866 req->Flags = 0;
1867
1868 iov[0].iov_base = (char *)req;
1869
1870 /*
1871 * If no input data, the size of ioctl struct in
1872 * protocol spec still includes a 1 byte data buffer,
1873 * but if input data passed to ioctl, we do not
1874 * want to double count this, so we do not send
1875 * the dummy one byte of data in iovec[0] if sending
1876 * input data (in iovec[1]). We also must add 4 bytes
1877 * in first iovec to allow for rfc1002 length field.
1878 */
1879
1880 if (indatalen) {
1881 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1882 inc_rfc1001_len(req, indatalen - 1);
1883 } else
1884 iov[0].iov_len = get_rfc1002_length(req) + 4;
1885
1886
1887 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1888 cifs_small_buf_release(req);
1889 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1890
1891 if ((rc != 0) && (rc != -EINVAL)) {
1892 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1893 goto ioctl_exit;
1894 } else if (rc == -EINVAL) {
1895 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1896 (opcode != FSCTL_SRV_COPYCHUNK)) {
1897 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1898 goto ioctl_exit;
1899 }
1900 }
1901
1902 /* check if caller wants to look at return data or just return rc */
1903 if ((plen == NULL) || (out_data == NULL))
1904 goto ioctl_exit;
1905
1906 *plen = le32_to_cpu(rsp->OutputCount);
1907
1908 /* We check for obvious errors in the output buffer length and offset */
1909 if (*plen == 0)
1910 goto ioctl_exit; /* server returned no data */
1911 else if (*plen > 0xFF00) {
1912 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1913 *plen = 0;
1914 rc = -EIO;
1915 goto ioctl_exit;
1916 }
1917
1918 if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1919 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1920 le32_to_cpu(rsp->OutputOffset));
1921 *plen = 0;
1922 rc = -EIO;
1923 goto ioctl_exit;
1924 }
1925
1926 *out_data = kmalloc(*plen, GFP_KERNEL);
1927 if (*out_data == NULL) {
1928 rc = -ENOMEM;
1929 goto ioctl_exit;
1930 }
1931
1932 shdr = get_sync_hdr(rsp);
1933 memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1934 ioctl_exit:
1935 free_rsp_buf(resp_buftype, rsp);
1936 return rc;
1937 }
1938
1939 /*
1940 * Individual callers to ioctl worker function follow
1941 */
1942
1943 int
1944 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1945 u64 persistent_fid, u64 volatile_fid)
1946 {
1947 int rc;
1948 struct compress_ioctl fsctl_input;
1949 char *ret_data = NULL;
1950
1951 fsctl_input.CompressionState =
1952 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1953
1954 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1955 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1956 false /* use_ipc */,
1957 (char *)&fsctl_input /* data input */,
1958 2 /* in data len */, &ret_data /* out data */, NULL);
1959
1960 cifs_dbg(FYI, "set compression rc %d\n", rc);
1961
1962 return rc;
1963 }
1964
1965 int
1966 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1967 u64 persistent_fid, u64 volatile_fid)
1968 {
1969 struct smb2_close_req *req;
1970 struct smb2_close_rsp *rsp;
1971 struct cifs_ses *ses = tcon->ses;
1972 struct kvec iov[1];
1973 struct kvec rsp_iov;
1974 int resp_buftype;
1975 int rc = 0;
1976 int flags = 0;
1977
1978 cifs_dbg(FYI, "Close\n");
1979
1980 if (!ses || !(ses->server))
1981 return -EIO;
1982
1983 rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1984 if (rc)
1985 return rc;
1986
1987 if (encryption_required(tcon))
1988 flags |= CIFS_TRANSFORM_REQ;
1989
1990 req->PersistentFileId = persistent_fid;
1991 req->VolatileFileId = volatile_fid;
1992
1993 iov[0].iov_base = (char *)req;
1994 /* 4 for rfc1002 length field */
1995 iov[0].iov_len = get_rfc1002_length(req) + 4;
1996
1997 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
1998 cifs_small_buf_release(req);
1999 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2000
2001 if (rc != 0) {
2002 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2003 goto close_exit;
2004 }
2005
2006 /* BB FIXME - decode close response, update inode for caching */
2007
2008 close_exit:
2009 free_rsp_buf(resp_buftype, rsp);
2010 return rc;
2011 }
2012
2013 static int
2014 validate_buf(unsigned int offset, unsigned int buffer_length,
2015 struct smb2_hdr *hdr, unsigned int min_buf_size)
2016
2017 {
2018 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2019 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2020 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2021 char *end_of_buf = begin_of_buf + buffer_length;
2022
2023
2024 if (buffer_length < min_buf_size) {
2025 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2026 buffer_length, min_buf_size);
2027 return -EINVAL;
2028 }
2029
2030 /* check if beyond RFC1001 maximum length */
2031 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2032 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2033 buffer_length, smb_len);
2034 return -EINVAL;
2035 }
2036
2037 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2038 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2039 return -EINVAL;
2040 }
2041
2042 return 0;
2043 }
2044
2045 /*
2046 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2047 * Caller must free buffer.
2048 */
2049 static int
2050 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2051 struct smb2_hdr *hdr, unsigned int minbufsize,
2052 char *data)
2053
2054 {
2055 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2056 int rc;
2057
2058 if (!data)
2059 return -EINVAL;
2060
2061 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2062 if (rc)
2063 return rc;
2064
2065 memcpy(data, begin_of_buf, buffer_length);
2066
2067 return 0;
2068 }
2069
2070 static int
2071 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2072 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2073 u32 additional_info, size_t output_len, size_t min_len, void **data,
2074 u32 *dlen)
2075 {
2076 struct smb2_query_info_req *req;
2077 struct smb2_query_info_rsp *rsp = NULL;
2078 struct kvec iov[2];
2079 struct kvec rsp_iov;
2080 int rc = 0;
2081 int resp_buftype;
2082 struct cifs_ses *ses = tcon->ses;
2083 int flags = 0;
2084
2085 cifs_dbg(FYI, "Query Info\n");
2086
2087 if (!ses || !(ses->server))
2088 return -EIO;
2089
2090 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2091 if (rc)
2092 return rc;
2093
2094 if (encryption_required(tcon))
2095 flags |= CIFS_TRANSFORM_REQ;
2096
2097 req->InfoType = info_type;
2098 req->FileInfoClass = info_class;
2099 req->PersistentFileId = persistent_fid;
2100 req->VolatileFileId = volatile_fid;
2101 req->AdditionalInformation = cpu_to_le32(additional_info);
2102 /* 4 for rfc1002 length field and 1 for Buffer */
2103 req->InputBufferOffset =
2104 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2105 req->OutputBufferLength = cpu_to_le32(output_len);
2106
2107 iov[0].iov_base = (char *)req;
2108 /* 4 for rfc1002 length field */
2109 iov[0].iov_len = get_rfc1002_length(req) + 4;
2110
2111 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2112 cifs_small_buf_release(req);
2113 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2114
2115 if (rc) {
2116 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2117 goto qinf_exit;
2118 }
2119
2120 if (dlen) {
2121 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2122 if (!*data) {
2123 *data = kmalloc(*dlen, GFP_KERNEL);
2124 if (!*data) {
2125 cifs_dbg(VFS,
2126 "Error %d allocating memory for acl\n",
2127 rc);
2128 *dlen = 0;
2129 goto qinf_exit;
2130 }
2131 }
2132 }
2133
2134 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2135 le32_to_cpu(rsp->OutputBufferLength),
2136 &rsp->hdr, min_len, *data);
2137
2138 qinf_exit:
2139 free_rsp_buf(resp_buftype, rsp);
2140 return rc;
2141 }
2142
2143 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2144 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2145 {
2146 return query_info(xid, tcon, persistent_fid, volatile_fid,
2147 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2148 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2149 sizeof(struct smb2_file_all_info), (void **)&data,
2150 NULL);
2151 }
2152
2153 int
2154 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2155 u64 persistent_fid, u64 volatile_fid,
2156 void **data, u32 *plen)
2157 {
2158 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2159 *plen = 0;
2160
2161 return query_info(xid, tcon, persistent_fid, volatile_fid,
2162 0, SMB2_O_INFO_SECURITY, additional_info,
2163 SMB2_MAX_BUFFER_SIZE,
2164 sizeof(struct smb2_file_all_info), data, plen);
2165 }
2166
2167 int
2168 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2169 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2170 {
2171 return query_info(xid, tcon, persistent_fid, volatile_fid,
2172 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2173 sizeof(struct smb2_file_internal_info),
2174 sizeof(struct smb2_file_internal_info),
2175 (void **)&uniqueid, NULL);
2176 }
2177
2178 /*
2179 * This is a no-op for now. We're not really interested in the reply, but
2180 * rather in the fact that the server sent one and that server->lstrp
2181 * gets updated.
2182 *
2183 * FIXME: maybe we should consider checking that the reply matches request?
2184 */
2185 static void
2186 smb2_echo_callback(struct mid_q_entry *mid)
2187 {
2188 struct TCP_Server_Info *server = mid->callback_data;
2189 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2190 unsigned int credits_received = 1;
2191
2192 if (mid->mid_state == MID_RESPONSE_RECEIVED)
2193 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2194
2195 DeleteMidQEntry(mid);
2196 add_credits(server, credits_received, CIFS_ECHO_OP);
2197 }
2198
2199 void smb2_reconnect_server(struct work_struct *work)
2200 {
2201 struct TCP_Server_Info *server = container_of(work,
2202 struct TCP_Server_Info, reconnect.work);
2203 struct cifs_ses *ses;
2204 struct cifs_tcon *tcon, *tcon2;
2205 struct list_head tmp_list;
2206 int tcon_exist = false;
2207 int rc;
2208 int resched = false;
2209
2210
2211 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2212 mutex_lock(&server->reconnect_mutex);
2213
2214 INIT_LIST_HEAD(&tmp_list);
2215 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2216
2217 spin_lock(&cifs_tcp_ses_lock);
2218 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2219 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2220 if (tcon->need_reconnect || tcon->need_reopen_files) {
2221 tcon->tc_count++;
2222 list_add_tail(&tcon->rlist, &tmp_list);
2223 tcon_exist = true;
2224 }
2225 }
2226 }
2227 /*
2228 * Get the reference to server struct to be sure that the last call of
2229 * cifs_put_tcon() in the loop below won't release the server pointer.
2230 */
2231 if (tcon_exist)
2232 server->srv_count++;
2233
2234 spin_unlock(&cifs_tcp_ses_lock);
2235
2236 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2237 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2238 if (!rc)
2239 cifs_reopen_persistent_handles(tcon);
2240 else
2241 resched = true;
2242 list_del_init(&tcon->rlist);
2243 cifs_put_tcon(tcon);
2244 }
2245
2246 cifs_dbg(FYI, "Reconnecting tcons finished\n");
2247 if (resched)
2248 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2249 mutex_unlock(&server->reconnect_mutex);
2250
2251 /* now we can safely release srv struct */
2252 if (tcon_exist)
2253 cifs_put_tcp_session(server, 1);
2254 }
2255
2256 int
2257 SMB2_echo(struct TCP_Server_Info *server)
2258 {
2259 struct smb2_echo_req *req;
2260 int rc = 0;
2261 struct kvec iov[2];
2262 struct smb_rqst rqst = { .rq_iov = iov,
2263 .rq_nvec = 2 };
2264
2265 cifs_dbg(FYI, "In echo request\n");
2266
2267 if (server->tcpStatus == CifsNeedNegotiate) {
2268 /* No need to send echo on newly established connections */
2269 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2270 return rc;
2271 }
2272
2273 rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2274 if (rc)
2275 return rc;
2276
2277 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2278
2279 /* 4 for rfc1002 length field */
2280 iov[0].iov_len = 4;
2281 iov[0].iov_base = (char *)req;
2282 iov[1].iov_len = get_rfc1002_length(req);
2283 iov[1].iov_base = (char *)req + 4;
2284
2285 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2286 server, CIFS_ECHO_OP);
2287 if (rc)
2288 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2289
2290 cifs_small_buf_release(req);
2291 return rc;
2292 }
2293
2294 int
2295 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2296 u64 volatile_fid)
2297 {
2298 struct smb2_flush_req *req;
2299 struct cifs_ses *ses = tcon->ses;
2300 struct kvec iov[1];
2301 struct kvec rsp_iov;
2302 int resp_buftype;
2303 int rc = 0;
2304 int flags = 0;
2305
2306 cifs_dbg(FYI, "Flush\n");
2307
2308 if (!ses || !(ses->server))
2309 return -EIO;
2310
2311 rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2312 if (rc)
2313 return rc;
2314
2315 if (encryption_required(tcon))
2316 flags |= CIFS_TRANSFORM_REQ;
2317
2318 req->PersistentFileId = persistent_fid;
2319 req->VolatileFileId = volatile_fid;
2320
2321 iov[0].iov_base = (char *)req;
2322 /* 4 for rfc1002 length field */
2323 iov[0].iov_len = get_rfc1002_length(req) + 4;
2324
2325 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2326 cifs_small_buf_release(req);
2327
2328 if (rc != 0)
2329 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2330
2331 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2332 return rc;
2333 }
2334
2335 /*
2336 * To form a chain of read requests, any read requests after the first should
2337 * have the end_of_chain boolean set to true.
2338 */
2339 static int
2340 smb2_new_read_req(void **buf, unsigned int *total_len,
2341 struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2342 int request_type)
2343 {
2344 int rc = -EACCES;
2345 struct smb2_read_plain_req *req = NULL;
2346 struct smb2_sync_hdr *shdr;
2347
2348 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2349 total_len);
2350 if (rc)
2351 return rc;
2352 if (io_parms->tcon->ses->server == NULL)
2353 return -ECONNABORTED;
2354
2355 shdr = &req->sync_hdr;
2356 shdr->ProcessId = cpu_to_le32(io_parms->pid);
2357
2358 req->PersistentFileId = io_parms->persistent_fid;
2359 req->VolatileFileId = io_parms->volatile_fid;
2360 req->ReadChannelInfoOffset = 0; /* reserved */
2361 req->ReadChannelInfoLength = 0; /* reserved */
2362 req->Channel = 0; /* reserved */
2363 req->MinimumCount = 0;
2364 req->Length = cpu_to_le32(io_parms->length);
2365 req->Offset = cpu_to_le64(io_parms->offset);
2366
2367 if (request_type & CHAINED_REQUEST) {
2368 if (!(request_type & END_OF_CHAIN)) {
2369 /* next 8-byte aligned request */
2370 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2371 shdr->NextCommand = cpu_to_le32(*total_len);
2372 } else /* END_OF_CHAIN */
2373 shdr->NextCommand = 0;
2374 if (request_type & RELATED_REQUEST) {
2375 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2376 /*
2377 * Related requests use info from previous read request
2378 * in chain.
2379 */
2380 shdr->SessionId = 0xFFFFFFFF;
2381 shdr->TreeId = 0xFFFFFFFF;
2382 req->PersistentFileId = 0xFFFFFFFF;
2383 req->VolatileFileId = 0xFFFFFFFF;
2384 }
2385 }
2386 if (remaining_bytes > io_parms->length)
2387 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2388 else
2389 req->RemainingBytes = 0;
2390
2391 *buf = req;
2392 return rc;
2393 }
2394
2395 static void
2396 smb2_readv_callback(struct mid_q_entry *mid)
2397 {
2398 struct cifs_readdata *rdata = mid->callback_data;
2399 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2400 struct TCP_Server_Info *server = tcon->ses->server;
2401 struct smb2_sync_hdr *shdr =
2402 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2403 unsigned int credits_received = 1;
2404 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2405 .rq_nvec = 2,
2406 .rq_pages = rdata->pages,
2407 .rq_npages = rdata->nr_pages,
2408 .rq_pagesz = rdata->pagesz,
2409 .rq_tailsz = rdata->tailsz };
2410
2411 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2412 __func__, mid->mid, mid->mid_state, rdata->result,
2413 rdata->bytes);
2414
2415 switch (mid->mid_state) {
2416 case MID_RESPONSE_RECEIVED:
2417 credits_received = le16_to_cpu(shdr->CreditRequest);
2418 /* result already set, check signature */
2419 if (server->sign && !mid->decrypted) {
2420 int rc;
2421
2422 rc = smb2_verify_signature(&rqst, server);
2423 if (rc)
2424 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2425 rc);
2426 }
2427 /* FIXME: should this be counted toward the initiating task? */
2428 task_io_account_read(rdata->got_bytes);
2429 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2430 break;
2431 case MID_REQUEST_SUBMITTED:
2432 case MID_RETRY_NEEDED:
2433 rdata->result = -EAGAIN;
2434 if (server->sign && rdata->got_bytes)
2435 /* reset bytes number since we can not check a sign */
2436 rdata->got_bytes = 0;
2437 /* FIXME: should this be counted toward the initiating task? */
2438 task_io_account_read(rdata->got_bytes);
2439 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2440 break;
2441 default:
2442 if (rdata->result != -ENODATA)
2443 rdata->result = -EIO;
2444 }
2445
2446 if (rdata->result)
2447 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2448
2449 queue_work(cifsiod_wq, &rdata->work);
2450 DeleteMidQEntry(mid);
2451 add_credits(server, credits_received, 0);
2452 }
2453
2454 /* smb2_async_readv - send an async read, and set up mid to handle result */
2455 int
2456 smb2_async_readv(struct cifs_readdata *rdata)
2457 {
2458 int rc, flags = 0;
2459 char *buf;
2460 struct smb2_sync_hdr *shdr;
2461 struct cifs_io_parms io_parms;
2462 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2463 .rq_nvec = 2 };
2464 struct TCP_Server_Info *server;
2465 unsigned int total_len;
2466 __be32 req_len;
2467
2468 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2469 __func__, rdata->offset, rdata->bytes);
2470
2471 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2472 io_parms.offset = rdata->offset;
2473 io_parms.length = rdata->bytes;
2474 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2475 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2476 io_parms.pid = rdata->pid;
2477
2478 server = io_parms.tcon->ses->server;
2479
2480 rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2481 if (rc) {
2482 if (rc == -EAGAIN && rdata->credits) {
2483 /* credits was reset by reconnect */
2484 rdata->credits = 0;
2485 /* reduce in_flight value since we won't send the req */
2486 spin_lock(&server->req_lock);
2487 server->in_flight--;
2488 spin_unlock(&server->req_lock);
2489 }
2490 return rc;
2491 }
2492
2493 if (encryption_required(io_parms.tcon))
2494 flags |= CIFS_TRANSFORM_REQ;
2495
2496 req_len = cpu_to_be32(total_len);
2497
2498 rdata->iov[0].iov_base = &req_len;
2499 rdata->iov[0].iov_len = sizeof(__be32);
2500 rdata->iov[1].iov_base = buf;
2501 rdata->iov[1].iov_len = total_len;
2502
2503 shdr = (struct smb2_sync_hdr *)buf;
2504
2505 if (rdata->credits) {
2506 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2507 SMB2_MAX_BUFFER_SIZE));
2508 shdr->CreditRequest = shdr->CreditCharge;
2509 spin_lock(&server->req_lock);
2510 server->credits += rdata->credits -
2511 le16_to_cpu(shdr->CreditCharge);
2512 spin_unlock(&server->req_lock);
2513 wake_up(&server->request_q);
2514 flags |= CIFS_HAS_CREDITS;
2515 }
2516
2517 kref_get(&rdata->refcount);
2518 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2519 cifs_readv_receive, smb2_readv_callback,
2520 smb3_handle_read_data, rdata, flags);
2521 if (rc) {
2522 kref_put(&rdata->refcount, cifs_readdata_release);
2523 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2524 }
2525
2526 cifs_small_buf_release(buf);
2527 return rc;
2528 }
2529
2530 int
2531 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2532 unsigned int *nbytes, char **buf, int *buf_type)
2533 {
2534 int resp_buftype, rc = -EACCES;
2535 struct smb2_read_plain_req *req = NULL;
2536 struct smb2_read_rsp *rsp = NULL;
2537 struct smb2_sync_hdr *shdr;
2538 struct kvec iov[2];
2539 struct kvec rsp_iov;
2540 unsigned int total_len;
2541 __be32 req_len;
2542 struct smb_rqst rqst = { .rq_iov = iov,
2543 .rq_nvec = 2 };
2544 int flags = CIFS_LOG_ERROR;
2545 struct cifs_ses *ses = io_parms->tcon->ses;
2546
2547 *nbytes = 0;
2548 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2549 if (rc)
2550 return rc;
2551
2552 if (encryption_required(io_parms->tcon))
2553 flags |= CIFS_TRANSFORM_REQ;
2554
2555 req_len = cpu_to_be32(total_len);
2556
2557 iov[0].iov_base = &req_len;
2558 iov[0].iov_len = sizeof(__be32);
2559 iov[1].iov_base = req;
2560 iov[1].iov_len = total_len;
2561
2562 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2563 cifs_small_buf_release(req);
2564
2565 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2566 shdr = get_sync_hdr(rsp);
2567
2568 if (shdr->Status == STATUS_END_OF_FILE) {
2569 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2570 return 0;
2571 }
2572
2573 if (rc) {
2574 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2575 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2576 } else {
2577 *nbytes = le32_to_cpu(rsp->DataLength);
2578 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2579 (*nbytes > io_parms->length)) {
2580 cifs_dbg(FYI, "bad length %d for count %d\n",
2581 *nbytes, io_parms->length);
2582 rc = -EIO;
2583 *nbytes = 0;
2584 }
2585 }
2586
2587 if (*buf) {
2588 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2589 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2590 } else if (resp_buftype != CIFS_NO_BUFFER) {
2591 *buf = rsp_iov.iov_base;
2592 if (resp_buftype == CIFS_SMALL_BUFFER)
2593 *buf_type = CIFS_SMALL_BUFFER;
2594 else if (resp_buftype == CIFS_LARGE_BUFFER)
2595 *buf_type = CIFS_LARGE_BUFFER;
2596 }
2597 return rc;
2598 }
2599
2600 /*
2601 * Check the mid_state and signature on received buffer (if any), and queue the
2602 * workqueue completion task.
2603 */
2604 static void
2605 smb2_writev_callback(struct mid_q_entry *mid)
2606 {
2607 struct cifs_writedata *wdata = mid->callback_data;
2608 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2609 unsigned int written;
2610 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2611 unsigned int credits_received = 1;
2612
2613 switch (mid->mid_state) {
2614 case MID_RESPONSE_RECEIVED:
2615 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2616 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2617 if (wdata->result != 0)
2618 break;
2619
2620 written = le32_to_cpu(rsp->DataLength);
2621 /*
2622 * Mask off high 16 bits when bytes written as returned
2623 * by the server is greater than bytes requested by the
2624 * client. OS/2 servers are known to set incorrect
2625 * CountHigh values.
2626 */
2627 if (written > wdata->bytes)
2628 written &= 0xFFFF;
2629
2630 if (written < wdata->bytes)
2631 wdata->result = -ENOSPC;
2632 else
2633 wdata->bytes = written;
2634 break;
2635 case MID_REQUEST_SUBMITTED:
2636 case MID_RETRY_NEEDED:
2637 wdata->result = -EAGAIN;
2638 break;
2639 default:
2640 wdata->result = -EIO;
2641 break;
2642 }
2643
2644 if (wdata->result)
2645 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2646
2647 queue_work(cifsiod_wq, &wdata->work);
2648 DeleteMidQEntry(mid);
2649 add_credits(tcon->ses->server, credits_received, 0);
2650 }
2651
2652 /* smb2_async_writev - send an async write, and set up mid to handle result */
2653 int
2654 smb2_async_writev(struct cifs_writedata *wdata,
2655 void (*release)(struct kref *kref))
2656 {
2657 int rc = -EACCES, flags = 0;
2658 struct smb2_write_req *req = NULL;
2659 struct smb2_sync_hdr *shdr;
2660 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2661 struct TCP_Server_Info *server = tcon->ses->server;
2662 struct kvec iov[2];
2663 struct smb_rqst rqst = { };
2664
2665 rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2666 if (rc) {
2667 if (rc == -EAGAIN && wdata->credits) {
2668 /* credits was reset by reconnect */
2669 wdata->credits = 0;
2670 /* reduce in_flight value since we won't send the req */
2671 spin_lock(&server->req_lock);
2672 server->in_flight--;
2673 spin_unlock(&server->req_lock);
2674 }
2675 goto async_writev_out;
2676 }
2677
2678 if (encryption_required(tcon))
2679 flags |= CIFS_TRANSFORM_REQ;
2680
2681 shdr = get_sync_hdr(req);
2682 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2683
2684 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2685 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2686 req->WriteChannelInfoOffset = 0;
2687 req->WriteChannelInfoLength = 0;
2688 req->Channel = 0;
2689 req->Offset = cpu_to_le64(wdata->offset);
2690 /* 4 for rfc1002 length field */
2691 req->DataOffset = cpu_to_le16(
2692 offsetof(struct smb2_write_req, Buffer) - 4);
2693 req->RemainingBytes = 0;
2694
2695 /* 4 for rfc1002 length field and 1 for Buffer */
2696 iov[0].iov_len = 4;
2697 iov[0].iov_base = req;
2698 iov[1].iov_len = get_rfc1002_length(req) - 1;
2699 iov[1].iov_base = (char *)req + 4;
2700
2701 rqst.rq_iov = iov;
2702 rqst.rq_nvec = 2;
2703 rqst.rq_pages = wdata->pages;
2704 rqst.rq_npages = wdata->nr_pages;
2705 rqst.rq_pagesz = wdata->pagesz;
2706 rqst.rq_tailsz = wdata->tailsz;
2707
2708 cifs_dbg(FYI, "async write at %llu %u bytes\n",
2709 wdata->offset, wdata->bytes);
2710
2711 req->Length = cpu_to_le32(wdata->bytes);
2712
2713 inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2714
2715 if (wdata->credits) {
2716 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2717 SMB2_MAX_BUFFER_SIZE));
2718 shdr->CreditRequest = shdr->CreditCharge;
2719 spin_lock(&server->req_lock);
2720 server->credits += wdata->credits -
2721 le16_to_cpu(shdr->CreditCharge);
2722 spin_unlock(&server->req_lock);
2723 wake_up(&server->request_q);
2724 flags |= CIFS_HAS_CREDITS;
2725 }
2726
2727 kref_get(&wdata->refcount);
2728 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2729 wdata, flags);
2730
2731 if (rc) {
2732 kref_put(&wdata->refcount, release);
2733 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2734 }
2735
2736 async_writev_out:
2737 cifs_small_buf_release(req);
2738 return rc;
2739 }
2740
2741 /*
2742 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2743 * The length field from io_parms must be at least 1 and indicates a number of
2744 * elements with data to write that begins with position 1 in iov array. All
2745 * data length is specified by count.
2746 */
2747 int
2748 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2749 unsigned int *nbytes, struct kvec *iov, int n_vec)
2750 {
2751 int rc = 0;
2752 struct smb2_write_req *req = NULL;
2753 struct smb2_write_rsp *rsp = NULL;
2754 int resp_buftype;
2755 struct kvec rsp_iov;
2756 int flags = 0;
2757
2758 *nbytes = 0;
2759
2760 if (n_vec < 1)
2761 return rc;
2762
2763 rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2764 if (rc)
2765 return rc;
2766
2767 if (io_parms->tcon->ses->server == NULL)
2768 return -ECONNABORTED;
2769
2770 if (encryption_required(io_parms->tcon))
2771 flags |= CIFS_TRANSFORM_REQ;
2772
2773 req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2774
2775 req->PersistentFileId = io_parms->persistent_fid;
2776 req->VolatileFileId = io_parms->volatile_fid;
2777 req->WriteChannelInfoOffset = 0;
2778 req->WriteChannelInfoLength = 0;
2779 req->Channel = 0;
2780 req->Length = cpu_to_le32(io_parms->length);
2781 req->Offset = cpu_to_le64(io_parms->offset);
2782 /* 4 for rfc1002 length field */
2783 req->DataOffset = cpu_to_le16(
2784 offsetof(struct smb2_write_req, Buffer) - 4);
2785 req->RemainingBytes = 0;
2786
2787 iov[0].iov_base = (char *)req;
2788 /* 4 for rfc1002 length field and 1 for Buffer */
2789 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2790
2791 /* length of entire message including data to be written */
2792 inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2793
2794 rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2795 &resp_buftype, flags, &rsp_iov);
2796 cifs_small_buf_release(req);
2797 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2798
2799 if (rc) {
2800 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2801 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2802 } else
2803 *nbytes = le32_to_cpu(rsp->DataLength);
2804
2805 free_rsp_buf(resp_buftype, rsp);
2806 return rc;
2807 }
2808
2809 static unsigned int
2810 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2811 {
2812 int len;
2813 unsigned int entrycount = 0;
2814 unsigned int next_offset = 0;
2815 FILE_DIRECTORY_INFO *entryptr;
2816
2817 if (bufstart == NULL)
2818 return 0;
2819
2820 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2821
2822 while (1) {
2823 entryptr = (FILE_DIRECTORY_INFO *)
2824 ((char *)entryptr + next_offset);
2825
2826 if ((char *)entryptr + size > end_of_buf) {
2827 cifs_dbg(VFS, "malformed search entry would overflow\n");
2828 break;
2829 }
2830
2831 len = le32_to_cpu(entryptr->FileNameLength);
2832 if ((char *)entryptr + len + size > end_of_buf) {
2833 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2834 end_of_buf);
2835 break;
2836 }
2837
2838 *lastentry = (char *)entryptr;
2839 entrycount++;
2840
2841 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2842 if (!next_offset)
2843 break;
2844 }
2845
2846 return entrycount;
2847 }
2848
2849 /*
2850 * Readdir/FindFirst
2851 */
2852 int
2853 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2854 u64 persistent_fid, u64 volatile_fid, int index,
2855 struct cifs_search_info *srch_inf)
2856 {
2857 struct smb2_query_directory_req *req;
2858 struct smb2_query_directory_rsp *rsp = NULL;
2859 struct kvec iov[2];
2860 struct kvec rsp_iov;
2861 int rc = 0;
2862 int len;
2863 int resp_buftype = CIFS_NO_BUFFER;
2864 unsigned char *bufptr;
2865 struct TCP_Server_Info *server;
2866 struct cifs_ses *ses = tcon->ses;
2867 __le16 asteriks = cpu_to_le16('*');
2868 char *end_of_smb;
2869 unsigned int output_size = CIFSMaxBufSize;
2870 size_t info_buf_size;
2871 int flags = 0;
2872
2873 if (ses && (ses->server))
2874 server = ses->server;
2875 else
2876 return -EIO;
2877
2878 rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2879 if (rc)
2880 return rc;
2881
2882 if (encryption_required(tcon))
2883 flags |= CIFS_TRANSFORM_REQ;
2884
2885 switch (srch_inf->info_level) {
2886 case SMB_FIND_FILE_DIRECTORY_INFO:
2887 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2888 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2889 break;
2890 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2891 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2892 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2893 break;
2894 default:
2895 cifs_dbg(VFS, "info level %u isn't supported\n",
2896 srch_inf->info_level);
2897 rc = -EINVAL;
2898 goto qdir_exit;
2899 }
2900
2901 req->FileIndex = cpu_to_le32(index);
2902 req->PersistentFileId = persistent_fid;
2903 req->VolatileFileId = volatile_fid;
2904
2905 len = 0x2;
2906 bufptr = req->Buffer;
2907 memcpy(bufptr, &asteriks, len);
2908
2909 req->FileNameOffset =
2910 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2911 req->FileNameLength = cpu_to_le16(len);
2912 /*
2913 * BB could be 30 bytes or so longer if we used SMB2 specific
2914 * buffer lengths, but this is safe and close enough.
2915 */
2916 output_size = min_t(unsigned int, output_size, server->maxBuf);
2917 output_size = min_t(unsigned int, output_size, 2 << 15);
2918 req->OutputBufferLength = cpu_to_le32(output_size);
2919
2920 iov[0].iov_base = (char *)req;
2921 /* 4 for RFC1001 length and 1 for Buffer */
2922 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2923
2924 iov[1].iov_base = (char *)(req->Buffer);
2925 iov[1].iov_len = len;
2926
2927 inc_rfc1001_len(req, len - 1 /* Buffer */);
2928
2929 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2930 cifs_small_buf_release(req);
2931 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2932
2933 if (rc) {
2934 if (rc == -ENODATA &&
2935 rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2936 srch_inf->endOfSearch = true;
2937 rc = 0;
2938 }
2939 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2940 goto qdir_exit;
2941 }
2942
2943 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2944 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2945 info_buf_size);
2946 if (rc)
2947 goto qdir_exit;
2948
2949 srch_inf->unicode = true;
2950
2951 if (srch_inf->ntwrk_buf_start) {
2952 if (srch_inf->smallBuf)
2953 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2954 else
2955 cifs_buf_release(srch_inf->ntwrk_buf_start);
2956 }
2957 srch_inf->ntwrk_buf_start = (char *)rsp;
2958 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2959 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2960 /* 4 for rfc1002 length field */
2961 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2962 srch_inf->entries_in_buffer =
2963 num_entries(srch_inf->srch_entries_start, end_of_smb,
2964 &srch_inf->last_entry, info_buf_size);
2965 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2966 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2967 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2968 srch_inf->srch_entries_start, srch_inf->last_entry);
2969 if (resp_buftype == CIFS_LARGE_BUFFER)
2970 srch_inf->smallBuf = false;
2971 else if (resp_buftype == CIFS_SMALL_BUFFER)
2972 srch_inf->smallBuf = true;
2973 else
2974 cifs_dbg(VFS, "illegal search buffer type\n");
2975
2976 return rc;
2977
2978 qdir_exit:
2979 free_rsp_buf(resp_buftype, rsp);
2980 return rc;
2981 }
2982
2983 static int
2984 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2985 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
2986 u8 info_type, u32 additional_info, unsigned int num,
2987 void **data, unsigned int *size)
2988 {
2989 struct smb2_set_info_req *req;
2990 struct smb2_set_info_rsp *rsp = NULL;
2991 struct kvec *iov;
2992 struct kvec rsp_iov;
2993 int rc = 0;
2994 int resp_buftype;
2995 unsigned int i;
2996 struct cifs_ses *ses = tcon->ses;
2997 int flags = 0;
2998
2999 if (!ses || !(ses->server))
3000 return -EIO;
3001
3002 if (!num)
3003 return -EINVAL;
3004
3005 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3006 if (!iov)
3007 return -ENOMEM;
3008
3009 rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3010 if (rc) {
3011 kfree(iov);
3012 return rc;
3013 }
3014
3015 if (encryption_required(tcon))
3016 flags |= CIFS_TRANSFORM_REQ;
3017
3018 req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3019
3020 req->InfoType = info_type;
3021 req->FileInfoClass = info_class;
3022 req->PersistentFileId = persistent_fid;
3023 req->VolatileFileId = volatile_fid;
3024 req->AdditionalInformation = cpu_to_le32(additional_info);
3025
3026 /* 4 for RFC1001 length and 1 for Buffer */
3027 req->BufferOffset =
3028 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3029 req->BufferLength = cpu_to_le32(*size);
3030
3031 inc_rfc1001_len(req, *size - 1 /* Buffer */);
3032
3033 memcpy(req->Buffer, *data, *size);
3034
3035 iov[0].iov_base = (char *)req;
3036 /* 4 for RFC1001 length */
3037 iov[0].iov_len = get_rfc1002_length(req) + 4;
3038
3039 for (i = 1; i < num; i++) {
3040 inc_rfc1001_len(req, size[i]);
3041 le32_add_cpu(&req->BufferLength, size[i]);
3042 iov[i].iov_base = (char *)data[i];
3043 iov[i].iov_len = size[i];
3044 }
3045
3046 rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3047 cifs_small_buf_release(req);
3048 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3049
3050 if (rc != 0)
3051 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3052
3053 free_rsp_buf(resp_buftype, rsp);
3054 kfree(iov);
3055 return rc;
3056 }
3057
3058 int
3059 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3060 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3061 {
3062 struct smb2_file_rename_info info;
3063 void **data;
3064 unsigned int size[2];
3065 int rc;
3066 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3067
3068 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3069 if (!data)
3070 return -ENOMEM;
3071
3072 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3073 /* 0 = fail if target already exists */
3074 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3075 info.FileNameLength = cpu_to_le32(len);
3076
3077 data[0] = &info;
3078 size[0] = sizeof(struct smb2_file_rename_info);
3079
3080 data[1] = target_file;
3081 size[1] = len + 2 /* null */;
3082
3083 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3084 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3085 0, 2, data, size);
3086 kfree(data);
3087 return rc;
3088 }
3089
3090 int
3091 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3092 u64 persistent_fid, u64 volatile_fid)
3093 {
3094 __u8 delete_pending = 1;
3095 void *data;
3096 unsigned int size;
3097
3098 data = &delete_pending;
3099 size = 1; /* sizeof __u8 */
3100
3101 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3102 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3103 0, 1, &data, &size);
3104 }
3105
3106 int
3107 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3108 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3109 {
3110 struct smb2_file_link_info info;
3111 void **data;
3112 unsigned int size[2];
3113 int rc;
3114 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3115
3116 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3117 if (!data)
3118 return -ENOMEM;
3119
3120 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3121 /* 0 = fail if link already exists */
3122 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3123 info.FileNameLength = cpu_to_le32(len);
3124
3125 data[0] = &info;
3126 size[0] = sizeof(struct smb2_file_link_info);
3127
3128 data[1] = target_file;
3129 size[1] = len + 2 /* null */;
3130
3131 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3132 current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3133 0, 2, data, size);
3134 kfree(data);
3135 return rc;
3136 }
3137
3138 int
3139 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3140 u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3141 {
3142 struct smb2_file_eof_info info;
3143 void *data;
3144 unsigned int size;
3145
3146 info.EndOfFile = *eof;
3147
3148 data = &info;
3149 size = sizeof(struct smb2_file_eof_info);
3150
3151 if (is_falloc)
3152 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3153 pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3154 0, 1, &data, &size);
3155 else
3156 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3157 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3158 0, 1, &data, &size);
3159 }
3160
3161 int
3162 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3163 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3164 {
3165 unsigned int size;
3166 size = sizeof(FILE_BASIC_INFO);
3167 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3168 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3169 0, 1, (void **)&buf, &size);
3170 }
3171
3172 int
3173 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3174 u64 persistent_fid, u64 volatile_fid,
3175 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3176 {
3177 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3178 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3179 1, (void **)&pnntsd, &pacllen);
3180 }
3181
3182 int
3183 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3184 const u64 persistent_fid, const u64 volatile_fid,
3185 __u8 oplock_level)
3186 {
3187 int rc;
3188 struct smb2_oplock_break *req = NULL;
3189 int flags = CIFS_OBREAK_OP;
3190
3191 cifs_dbg(FYI, "SMB2_oplock_break\n");
3192 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3193 if (rc)
3194 return rc;
3195
3196 if (encryption_required(tcon))
3197 flags |= CIFS_TRANSFORM_REQ;
3198
3199 req->VolatileFid = volatile_fid;
3200 req->PersistentFid = persistent_fid;
3201 req->OplockLevel = oplock_level;
3202 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3203
3204 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3205 cifs_small_buf_release(req);
3206
3207 if (rc) {
3208 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3209 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3210 }
3211
3212 return rc;
3213 }
3214
3215 static void
3216 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3217 struct kstatfs *kst)
3218 {
3219 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3220 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3221 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3222 kst->f_bfree = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
3223 kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3224 return;
3225 }
3226
3227 static int
3228 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3229 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3230 {
3231 int rc;
3232 struct smb2_query_info_req *req;
3233
3234 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3235
3236 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3237 return -EIO;
3238
3239 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3240 if (rc)
3241 return rc;
3242
3243 req->InfoType = SMB2_O_INFO_FILESYSTEM;
3244 req->FileInfoClass = level;
3245 req->PersistentFileId = persistent_fid;
3246 req->VolatileFileId = volatile_fid;
3247 /* 4 for rfc1002 length field and 1 for pad */
3248 req->InputBufferOffset =
3249 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3250 req->OutputBufferLength = cpu_to_le32(
3251 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3252
3253 iov->iov_base = (char *)req;
3254 /* 4 for rfc1002 length field */
3255 iov->iov_len = get_rfc1002_length(req) + 4;
3256 return 0;
3257 }
3258
3259 int
3260 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3261 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3262 {
3263 struct smb2_query_info_rsp *rsp = NULL;
3264 struct kvec iov;
3265 struct kvec rsp_iov;
3266 int rc = 0;
3267 int resp_buftype;
3268 struct cifs_ses *ses = tcon->ses;
3269 struct smb2_fs_full_size_info *info = NULL;
3270 int flags = 0;
3271
3272 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3273 sizeof(struct smb2_fs_full_size_info),
3274 persistent_fid, volatile_fid);
3275 if (rc)
3276 return rc;
3277
3278 if (encryption_required(tcon))
3279 flags |= CIFS_TRANSFORM_REQ;
3280
3281 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3282 cifs_small_buf_release(iov.iov_base);
3283 if (rc) {
3284 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3285 goto qfsinf_exit;
3286 }
3287 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3288
3289 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3290 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3291 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3292 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3293 sizeof(struct smb2_fs_full_size_info));
3294 if (!rc)
3295 copy_fs_info_to_kstatfs(info, fsdata);
3296
3297 qfsinf_exit:
3298 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3299 return rc;
3300 }
3301
3302 int
3303 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3304 u64 persistent_fid, u64 volatile_fid, int level)
3305 {
3306 struct smb2_query_info_rsp *rsp = NULL;
3307 struct kvec iov;
3308 struct kvec rsp_iov;
3309 int rc = 0;
3310 int resp_buftype, max_len, min_len;
3311 struct cifs_ses *ses = tcon->ses;
3312 unsigned int rsp_len, offset;
3313 int flags = 0;
3314
3315 if (level == FS_DEVICE_INFORMATION) {
3316 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3317 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3318 } else if (level == FS_ATTRIBUTE_INFORMATION) {
3319 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3320 min_len = MIN_FS_ATTR_INFO_SIZE;
3321 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3322 max_len = sizeof(struct smb3_fs_ss_info);
3323 min_len = sizeof(struct smb3_fs_ss_info);
3324 } else {
3325 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3326 return -EINVAL;
3327 }
3328
3329 rc = build_qfs_info_req(&iov, tcon, level, max_len,
3330 persistent_fid, volatile_fid);
3331 if (rc)
3332 return rc;
3333
3334 if (encryption_required(tcon))
3335 flags |= CIFS_TRANSFORM_REQ;
3336
3337 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3338 cifs_small_buf_release(iov.iov_base);
3339 if (rc) {
3340 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3341 goto qfsattr_exit;
3342 }
3343 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3344
3345 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3346 offset = le16_to_cpu(rsp->OutputBufferOffset);
3347 rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3348 if (rc)
3349 goto qfsattr_exit;
3350
3351 if (level == FS_ATTRIBUTE_INFORMATION)
3352 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3353 + (char *)&rsp->hdr, min_t(unsigned int,
3354 rsp_len, max_len));
3355 else if (level == FS_DEVICE_INFORMATION)
3356 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3357 + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3358 else if (level == FS_SECTOR_SIZE_INFORMATION) {
3359 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3360 (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3361 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3362 tcon->perf_sector_size =
3363 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3364 }
3365
3366 qfsattr_exit:
3367 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3368 return rc;
3369 }
3370
3371 int
3372 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3373 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3374 const __u32 num_lock, struct smb2_lock_element *buf)
3375 {
3376 int rc = 0;
3377 struct smb2_lock_req *req = NULL;
3378 struct kvec iov[2];
3379 struct kvec rsp_iov;
3380 int resp_buf_type;
3381 unsigned int count;
3382 int flags = CIFS_NO_RESP;
3383
3384 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3385
3386 rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3387 if (rc)
3388 return rc;
3389
3390 if (encryption_required(tcon))
3391 flags |= CIFS_TRANSFORM_REQ;
3392
3393 req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3394 req->LockCount = cpu_to_le16(num_lock);
3395
3396 req->PersistentFileId = persist_fid;
3397 req->VolatileFileId = volatile_fid;
3398
3399 count = num_lock * sizeof(struct smb2_lock_element);
3400 inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3401
3402 iov[0].iov_base = (char *)req;
3403 /* 4 for rfc1002 length field and count for all locks */
3404 iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3405 iov[1].iov_base = (char *)buf;
3406 iov[1].iov_len = count;
3407
3408 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3409 rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3410 &rsp_iov);
3411 cifs_small_buf_release(req);
3412 if (rc) {
3413 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3414 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3415 }
3416
3417 return rc;
3418 }
3419
3420 int
3421 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3422 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3423 const __u64 length, const __u64 offset, const __u32 lock_flags,
3424 const bool wait)
3425 {
3426 struct smb2_lock_element lock;
3427
3428 lock.Offset = cpu_to_le64(offset);
3429 lock.Length = cpu_to_le64(length);
3430 lock.Flags = cpu_to_le32(lock_flags);
3431 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3432 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3433
3434 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3435 }
3436
3437 int
3438 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3439 __u8 *lease_key, const __le32 lease_state)
3440 {
3441 int rc;
3442 struct smb2_lease_ack *req = NULL;
3443 int flags = CIFS_OBREAK_OP;
3444
3445 cifs_dbg(FYI, "SMB2_lease_break\n");
3446 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3447 if (rc)
3448 return rc;
3449
3450 if (encryption_required(tcon))
3451 flags |= CIFS_TRANSFORM_REQ;
3452
3453 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3454 req->StructureSize = cpu_to_le16(36);
3455 inc_rfc1001_len(req, 12);
3456
3457 memcpy(req->LeaseKey, lease_key, 16);
3458 req->LeaseState = lease_state;
3459
3460 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3461 cifs_small_buf_release(req);
3462
3463 if (rc) {
3464 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3465 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3466 }
3467
3468 return rc;
3469 }
CRIS linux kernel tree