?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
CIFS: Implement follow_link for SMB2
[linux-stable.git] / fs / cifs / smb2pdu.c
blob5a49861633a62652461ada755e16b187bd32ea1b
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/pagemap.h>
37 #include <linux/xattr.h>
38 #include "smb2pdu.h"
39 #include "cifsglob.h"
40 #include "cifsacl.h"
41 #include "cifsproto.h"
42 #include "smb2proto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "ntlmssp.h"
46 #include "smb2status.h"
47 #include "smb2glob.h"
48 #include "cifspdu.h"
49
50 /*
51 * The following table defines the expected "StructureSize" of SMB2 requests
52 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
53 *
54 * Note that commands are defined in smb2pdu.h in le16 but the array below is
55 * indexed by command in host byte order.
56 */
57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
58 /* SMB2_NEGOTIATE */ 36,
59 /* SMB2_SESSION_SETUP */ 25,
60 /* SMB2_LOGOFF */ 4,
61 /* SMB2_TREE_CONNECT */ 9,
62 /* SMB2_TREE_DISCONNECT */ 4,
63 /* SMB2_CREATE */ 57,
64 /* SMB2_CLOSE */ 24,
65 /* SMB2_FLUSH */ 24,
66 /* SMB2_READ */ 49,
67 /* SMB2_WRITE */ 49,
68 /* SMB2_LOCK */ 48,
69 /* SMB2_IOCTL */ 57,
70 /* SMB2_CANCEL */ 4,
71 /* SMB2_ECHO */ 4,
72 /* SMB2_QUERY_DIRECTORY */ 33,
73 /* SMB2_CHANGE_NOTIFY */ 32,
74 /* SMB2_QUERY_INFO */ 41,
75 /* SMB2_SET_INFO */ 33,
76 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
77 };
78
79
80 static void
81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
82 const struct cifs_tcon *tcon)
83 {
84 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
85 char *temp = (char *)hdr;
86 /* lookup word count ie StructureSize from table */
87 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
88
89 /*
90 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
91 * largest operations (Create)
92 */
93 memset(temp, 0, 256);
94
95 /* Note this is only network field converted to big endian */
96 hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
97 - 4 /* RFC 1001 length field itself not counted */);
98
99 hdr->ProtocolId[0] = 0xFE;
100 hdr->ProtocolId[1] = 'S';
101 hdr->ProtocolId[2] = 'M';
102 hdr->ProtocolId[3] = 'B';
103 hdr->StructureSize = cpu_to_le16(64);
104 hdr->Command = smb2_cmd;
105 hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
106 hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
107
108 if (!tcon)
109 goto out;
110
111 /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
112 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
113 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
114 if ((tcon->ses) &&
115 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
116 hdr->CreditCharge = cpu_to_le16(1);
117 /* else CreditCharge MBZ */
118
119 hdr->TreeId = tcon->tid;
120 /* Uid is not converted */
121 if (tcon->ses)
122 hdr->SessionId = tcon->ses->Suid;
123
124 /*
125 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
126 * to pass the path on the Open SMB prefixed by \\server\share.
127 * Not sure when we would need to do the augmented path (if ever) and
128 * setting this flag breaks the SMB2 open operation since it is
129 * illegal to send an empty path name (without \\server\share prefix)
130 * when the DFS flag is set in the SMB open header. We could
131 * consider setting the flag on all operations other than open
132 * but it is safer to net set it for now.
133 */
134 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
135 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
136
137 if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
138 hdr->Flags |= SMB2_FLAGS_SIGNED;
139 out:
140 pdu->StructureSize2 = cpu_to_le16(parmsize);
141 return;
142 }
143
144 static int
145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
146 {
147 int rc = 0;
148 struct nls_table *nls_codepage;
149 struct cifs_ses *ses;
150 struct TCP_Server_Info *server;
151
152 /*
153 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
154 * check for tcp and smb session status done differently
155 * for those three - in the calling routine.
156 */
157 if (tcon == NULL)
158 return rc;
159
160 if (smb2_command == SMB2_TREE_CONNECT)
161 return rc;
162
163 if (tcon->tidStatus == CifsExiting) {
164 /*
165 * only tree disconnect, open, and write,
166 * (and ulogoff which does not have tcon)
167 * are allowed as we start force umount.
168 */
169 if ((smb2_command != SMB2_WRITE) &&
170 (smb2_command != SMB2_CREATE) &&
171 (smb2_command != SMB2_TREE_DISCONNECT)) {
172 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
173 smb2_command);
174 return -ENODEV;
175 }
176 }
177 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
178 (!tcon->ses->server))
179 return -EIO;
180
181 ses = tcon->ses;
182 server = ses->server;
183
184 /*
185 * Give demultiplex thread up to 10 seconds to reconnect, should be
186 * greater than cifs socket timeout which is 7 seconds
187 */
188 while (server->tcpStatus == CifsNeedReconnect) {
189 /*
190 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
191 * here since they are implicitly done when session drops.
192 */
193 switch (smb2_command) {
194 /*
195 * BB Should we keep oplock break and add flush to exceptions?
196 */
197 case SMB2_TREE_DISCONNECT:
198 case SMB2_CANCEL:
199 case SMB2_CLOSE:
200 case SMB2_OPLOCK_BREAK:
201 return -EAGAIN;
202 }
203
204 wait_event_interruptible_timeout(server->response_q,
205 (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
206
207 /* are we still trying to reconnect? */
208 if (server->tcpStatus != CifsNeedReconnect)
209 break;
210
211 /*
212 * on "soft" mounts we wait once. Hard mounts keep
213 * retrying until process is killed or server comes
214 * back on-line
215 */
216 if (!tcon->retry) {
217 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
218 return -EHOSTDOWN;
219 }
220 }
221
222 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
223 return rc;
224
225 nls_codepage = load_nls_default();
226
227 /*
228 * need to prevent multiple threads trying to simultaneously reconnect
229 * the same SMB session
230 */
231 mutex_lock(&tcon->ses->session_mutex);
232 rc = cifs_negotiate_protocol(0, tcon->ses);
233 if (!rc && tcon->ses->need_reconnect)
234 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
235
236 if (rc || !tcon->need_reconnect) {
237 mutex_unlock(&tcon->ses->session_mutex);
238 goto out;
239 }
240
241 cifs_mark_open_files_invalid(tcon);
242 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
243 mutex_unlock(&tcon->ses->session_mutex);
244 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
245 if (rc)
246 goto out;
247 atomic_inc(&tconInfoReconnectCount);
248 /*
249 * BB FIXME add code to check if wsize needs update due to negotiated
250 * smb buffer size shrinking.
251 */
252 out:
253 /*
254 * Check if handle based operation so we know whether we can continue
255 * or not without returning to caller to reset file handle.
256 */
257 /*
258 * BB Is flush done by server on drop of tcp session? Should we special
259 * case it and skip above?
260 */
261 switch (smb2_command) {
262 case SMB2_FLUSH:
263 case SMB2_READ:
264 case SMB2_WRITE:
265 case SMB2_LOCK:
266 case SMB2_IOCTL:
267 case SMB2_QUERY_DIRECTORY:
268 case SMB2_CHANGE_NOTIFY:
269 case SMB2_QUERY_INFO:
270 case SMB2_SET_INFO:
271 return -EAGAIN;
272 }
273 unload_nls(nls_codepage);
274 return rc;
275 }
276
277 /*
278 * Allocate and return pointer to an SMB request hdr, and set basic
279 * SMB information in the SMB header. If the return code is zero, this
280 * function must have filled in request_buf pointer.
281 */
282 static int
283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
284 void **request_buf)
285 {
286 int rc = 0;
287
288 rc = smb2_reconnect(smb2_command, tcon);
289 if (rc)
290 return rc;
291
292 /* BB eventually switch this to SMB2 specific small buf size */
293 *request_buf = cifs_small_buf_get();
294 if (*request_buf == NULL) {
295 /* BB should we add a retry in here if not a writepage? */
296 return -ENOMEM;
297 }
298
299 smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
300
301 if (tcon != NULL) {
302 #ifdef CONFIG_CIFS_STATS2
303 uint16_t com_code = le16_to_cpu(smb2_command);
304 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
305 #endif
306 cifs_stats_inc(&tcon->num_smbs_sent);
307 }
308
309 return rc;
310 }
311
312 static void
313 free_rsp_buf(int resp_buftype, void *rsp)
314 {
315 if (resp_buftype == CIFS_SMALL_BUFFER)
316 cifs_small_buf_release(rsp);
317 else if (resp_buftype == CIFS_LARGE_BUFFER)
318 cifs_buf_release(rsp);
319 }
320
321
322 /*
323 *
324 * SMB2 Worker functions follow:
325 *
326 * The general structure of the worker functions is:
327 * 1) Call smb2_init (assembles SMB2 header)
328 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
329 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
330 * 4) Decode SMB2 command specific fields in the fixed length area
331 * 5) Decode variable length data area (if any for this SMB2 command type)
332 * 6) Call free smb buffer
333 * 7) return
334 *
335 */
336
337 int
338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
339 {
340 struct smb2_negotiate_req *req;
341 struct smb2_negotiate_rsp *rsp;
342 struct kvec iov[1];
343 int rc = 0;
344 int resp_buftype;
345 struct TCP_Server_Info *server = ses->server;
346 int blob_offset, blob_length;
347 char *security_blob;
348 int flags = CIFS_NEG_OP;
349
350 cifs_dbg(FYI, "Negotiate protocol\n");
351
352 if (!server) {
353 WARN(1, "%s: server is NULL!\n", __func__);
354 return -EIO;
355 }
356
357 rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
358 if (rc)
359 return rc;
360
361 req->hdr.SessionId = 0;
362
363 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
364
365 req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
366 inc_rfc1001_len(req, 2);
367
368 /* only one of SMB2 signing flags may be set in SMB2 request */
369 if (ses->sign)
370 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
371 else if (global_secflags & CIFSSEC_MAY_SIGN)
372 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
373 else
374 req->SecurityMode = 0;
375
376 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
377
378 memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
379
380 iov[0].iov_base = (char *)req;
381 /* 4 for rfc1002 length field */
382 iov[0].iov_len = get_rfc1002_length(req) + 4;
383
384 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
385
386 rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
387 /*
388 * No tcon so can't do
389 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
390 */
391 if (rc != 0)
392 goto neg_exit;
393
394 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
395
396 /* BB we may eventually want to match the negotiated vs. requested
397 dialect, even though we are only requesting one at a time */
398 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
399 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
400 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
401 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
402 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
403 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
404 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
405 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
406 else {
407 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
408 le16_to_cpu(rsp->DialectRevision));
409 rc = -EIO;
410 goto neg_exit;
411 }
412 server->dialect = le16_to_cpu(rsp->DialectRevision);
413
414 /* SMB2 only has an extended negflavor */
415 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
416 server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
417 server->max_read = le32_to_cpu(rsp->MaxReadSize);
418 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
419 /* BB Do we need to validate the SecurityMode? */
420 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
421 server->capabilities = le32_to_cpu(rsp->Capabilities);
422 /* Internal types */
423 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
424
425 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
426 &rsp->hdr);
427 /*
428 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
429 * for us will be
430 * ses->sectype = RawNTLMSSP;
431 * but for time being this is our only auth choice so doesn't matter.
432 * We just found a server which sets blob length to zero expecting raw.
433 */
434 if (blob_length == 0)
435 cifs_dbg(FYI, "missing security blob on negprot\n");
436
437 rc = cifs_enable_signing(server, ses->sign);
438 #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
439 if (rc)
440 goto neg_exit;
441 if (blob_length)
442 rc = decode_neg_token_init(security_blob, blob_length,
443 &server->sec_type);
444 if (rc == 1)
445 rc = 0;
446 else if (rc == 0) {
447 rc = -EIO;
448 goto neg_exit;
449 }
450 #endif
451
452 neg_exit:
453 free_rsp_buf(resp_buftype, rsp);
454 return rc;
455 }
456
457 int
458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
459 const struct nls_table *nls_cp)
460 {
461 struct smb2_sess_setup_req *req;
462 struct smb2_sess_setup_rsp *rsp = NULL;
463 struct kvec iov[2];
464 int rc = 0;
465 int resp_buftype;
466 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
467 struct TCP_Server_Info *server = ses->server;
468 u16 blob_length = 0;
469 char *security_blob;
470 char *ntlmssp_blob = NULL;
471 bool use_spnego = false; /* else use raw ntlmssp */
472
473 cifs_dbg(FYI, "Session Setup\n");
474
475 if (!server) {
476 WARN(1, "%s: server is NULL!\n", __func__);
477 return -EIO;
478 }
479
480 /*
481 * If memory allocation is successful, caller of this function
482 * frees it.
483 */
484 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
485 if (!ses->ntlmssp)
486 return -ENOMEM;
487
488 /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
489 ses->sectype = RawNTLMSSP;
490
491 ssetup_ntlmssp_authenticate:
492 if (phase == NtLmChallenge)
493 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
494
495 rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
496 if (rc)
497 return rc;
498
499 req->hdr.SessionId = 0; /* First session, not a reauthenticate */
500 req->VcNumber = 0; /* MBZ */
501 /* to enable echos and oplocks */
502 req->hdr.CreditRequest = cpu_to_le16(3);
503
504 /* only one of SMB2 signing flags may be set in SMB2 request */
505 if (server->sign)
506 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
507 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
508 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
509 else
510 req->SecurityMode = 0;
511
512 req->Capabilities = 0;
513 req->Channel = 0; /* MBZ */
514
515 iov[0].iov_base = (char *)req;
516 /* 4 for rfc1002 length field and 1 for pad */
517 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
518 if (phase == NtLmNegotiate) {
519 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
520 GFP_KERNEL);
521 if (ntlmssp_blob == NULL) {
522 rc = -ENOMEM;
523 goto ssetup_exit;
524 }
525 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
526 if (use_spnego) {
527 /* blob_length = build_spnego_ntlmssp_blob(
528 &security_blob,
529 sizeof(struct _NEGOTIATE_MESSAGE),
530 ntlmssp_blob); */
531 /* BB eventually need to add this */
532 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
533 rc = -EOPNOTSUPP;
534 kfree(ntlmssp_blob);
535 goto ssetup_exit;
536 } else {
537 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
538 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
539 security_blob = ntlmssp_blob;
540 }
541 } else if (phase == NtLmAuthenticate) {
542 req->hdr.SessionId = ses->Suid;
543 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
544 GFP_KERNEL);
545 if (ntlmssp_blob == NULL) {
546 rc = -ENOMEM;
547 goto ssetup_exit;
548 }
549 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
550 nls_cp);
551 if (rc) {
552 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
553 rc);
554 goto ssetup_exit; /* BB double check error handling */
555 }
556 if (use_spnego) {
557 /* blob_length = build_spnego_ntlmssp_blob(
558 &security_blob,
559 blob_length,
560 ntlmssp_blob); */
561 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
562 rc = -EOPNOTSUPP;
563 kfree(ntlmssp_blob);
564 goto ssetup_exit;
565 } else {
566 security_blob = ntlmssp_blob;
567 }
568 } else {
569 cifs_dbg(VFS, "illegal ntlmssp phase\n");
570 rc = -EIO;
571 goto ssetup_exit;
572 }
573
574 /* Testing shows that buffer offset must be at location of Buffer[0] */
575 req->SecurityBufferOffset =
576 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
577 1 /* pad */ - 4 /* rfc1001 len */);
578 req->SecurityBufferLength = cpu_to_le16(blob_length);
579 iov[1].iov_base = security_blob;
580 iov[1].iov_len = blob_length;
581
582 inc_rfc1001_len(req, blob_length - 1 /* pad */);
583
584 /* BB add code to build os and lm fields */
585
586 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
587 CIFS_LOG_ERROR | CIFS_NEG_OP);
588
589 kfree(security_blob);
590 rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
591 if (resp_buftype != CIFS_NO_BUFFER &&
592 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
593 if (phase != NtLmNegotiate) {
594 cifs_dbg(VFS, "Unexpected more processing error\n");
595 goto ssetup_exit;
596 }
597 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
598 le16_to_cpu(rsp->SecurityBufferOffset)) {
599 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
600 le16_to_cpu(rsp->SecurityBufferOffset));
601 rc = -EIO;
602 goto ssetup_exit;
603 }
604
605 /* NTLMSSP Negotiate sent now processing challenge (response) */
606 phase = NtLmChallenge; /* process ntlmssp challenge */
607 rc = 0; /* MORE_PROCESSING is not an error here but expected */
608 ses->Suid = rsp->hdr.SessionId;
609 rc = decode_ntlmssp_challenge(rsp->Buffer,
610 le16_to_cpu(rsp->SecurityBufferLength), ses);
611 }
612
613 /*
614 * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
615 * but at least the raw NTLMSSP case works.
616 */
617 /*
618 * No tcon so can't do
619 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
620 */
621 if (rc != 0)
622 goto ssetup_exit;
623
624 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
625 ssetup_exit:
626 free_rsp_buf(resp_buftype, rsp);
627
628 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
629 if ((phase == NtLmChallenge) && (rc == 0))
630 goto ssetup_ntlmssp_authenticate;
631 return rc;
632 }
633
634 int
635 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
636 {
637 struct smb2_logoff_req *req; /* response is also trivial struct */
638 int rc = 0;
639 struct TCP_Server_Info *server;
640
641 cifs_dbg(FYI, "disconnect session %p\n", ses);
642
643 if (ses && (ses->server))
644 server = ses->server;
645 else
646 return -EIO;
647
648 rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
649 if (rc)
650 return rc;
651
652 /* since no tcon, smb2_init can not do this, so do here */
653 req->hdr.SessionId = ses->Suid;
654 if (server->sign)
655 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
656
657 rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
658 /*
659 * No tcon so can't do
660 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
661 */
662 return rc;
663 }
664
665 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
666 {
667 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
668 }
669
670 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
671
672 int
673 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
674 struct cifs_tcon *tcon, const struct nls_table *cp)
675 {
676 struct smb2_tree_connect_req *req;
677 struct smb2_tree_connect_rsp *rsp = NULL;
678 struct kvec iov[2];
679 int rc = 0;
680 int resp_buftype;
681 int unc_path_len;
682 struct TCP_Server_Info *server;
683 __le16 *unc_path = NULL;
684
685 cifs_dbg(FYI, "TCON\n");
686
687 if ((ses->server) && tree)
688 server = ses->server;
689 else
690 return -EIO;
691
692 if (tcon && tcon->bad_network_name)
693 return -ENOENT;
694
695 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
696 if (unc_path == NULL)
697 return -ENOMEM;
698
699 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
700 unc_path_len *= 2;
701 if (unc_path_len < 2) {
702 kfree(unc_path);
703 return -EINVAL;
704 }
705
706 rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
707 if (rc) {
708 kfree(unc_path);
709 return rc;
710 }
711
712 if (tcon == NULL) {
713 /* since no tcon, smb2_init can not do this, so do here */
714 req->hdr.SessionId = ses->Suid;
715 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
716 req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
717 }
718
719 iov[0].iov_base = (char *)req;
720 /* 4 for rfc1002 length field and 1 for pad */
721 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
722
723 /* Testing shows that buffer offset must be at location of Buffer[0] */
724 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
725 - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
726 req->PathLength = cpu_to_le16(unc_path_len - 2);
727 iov[1].iov_base = unc_path;
728 iov[1].iov_len = unc_path_len;
729
730 inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
731
732 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
733 rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
734
735 if (rc != 0) {
736 if (tcon) {
737 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
738 tcon->need_reconnect = true;
739 }
740 goto tcon_error_exit;
741 }
742
743 if (tcon == NULL) {
744 ses->ipc_tid = rsp->hdr.TreeId;
745 goto tcon_exit;
746 }
747
748 if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
749 cifs_dbg(FYI, "connection to disk share\n");
750 else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
751 tcon->ipc = true;
752 cifs_dbg(FYI, "connection to pipe share\n");
753 } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
754 tcon->print = true;
755 cifs_dbg(FYI, "connection to printer\n");
756 } else {
757 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
758 rc = -EOPNOTSUPP;
759 goto tcon_error_exit;
760 }
761
762 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
763 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
764 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
765 tcon->tidStatus = CifsGood;
766 tcon->need_reconnect = false;
767 tcon->tid = rsp->hdr.TreeId;
768 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
769
770 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
771 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
772 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
773
774 tcon_exit:
775 free_rsp_buf(resp_buftype, rsp);
776 kfree(unc_path);
777 return rc;
778
779 tcon_error_exit:
780 if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
781 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
782 tcon->bad_network_name = true;
783 }
784 goto tcon_exit;
785 }
786
787 int
788 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
789 {
790 struct smb2_tree_disconnect_req *req; /* response is trivial */
791 int rc = 0;
792 struct TCP_Server_Info *server;
793 struct cifs_ses *ses = tcon->ses;
794
795 cifs_dbg(FYI, "Tree Disconnect\n");
796
797 if (ses && (ses->server))
798 server = ses->server;
799 else
800 return -EIO;
801
802 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
803 return 0;
804
805 rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
806 if (rc)
807 return rc;
808
809 rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
810 if (rc)
811 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
812
813 return rc;
814 }
815
816 static struct create_lease *
817 create_lease_buf(u8 *lease_key, u8 oplock)
818 {
819 struct create_lease *buf;
820
821 buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
822 if (!buf)
823 return NULL;
824
825 buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
826 buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
827 if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
828 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
829 SMB2_LEASE_READ_CACHING;
830 else if (oplock == SMB2_OPLOCK_LEVEL_II)
831 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
832 else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
833 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
834 SMB2_LEASE_READ_CACHING |
835 SMB2_LEASE_WRITE_CACHING;
836
837 buf->ccontext.DataOffset = cpu_to_le16(offsetof
838 (struct create_lease, lcontext));
839 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
840 buf->ccontext.NameOffset = cpu_to_le16(offsetof
841 (struct create_lease, Name));
842 buf->ccontext.NameLength = cpu_to_le16(4);
843 buf->Name[0] = 'R';
844 buf->Name[1] = 'q';
845 buf->Name[2] = 'L';
846 buf->Name[3] = 's';
847 return buf;
848 }
849
850 static struct create_durable *
851 create_durable_buf(void)
852 {
853 struct create_durable *buf;
854
855 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
856 if (!buf)
857 return NULL;
858
859 buf->ccontext.DataOffset = cpu_to_le16(offsetof
860 (struct create_durable, Data));
861 buf->ccontext.DataLength = cpu_to_le32(16);
862 buf->ccontext.NameOffset = cpu_to_le16(offsetof
863 (struct create_durable, Name));
864 buf->ccontext.NameLength = cpu_to_le16(4);
865 buf->Name[0] = 'D';
866 buf->Name[1] = 'H';
867 buf->Name[2] = 'n';
868 buf->Name[3] = 'Q';
869 return buf;
870 }
871
872 static struct create_durable *
873 create_reconnect_durable_buf(struct cifs_fid *fid)
874 {
875 struct create_durable *buf;
876
877 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
878 if (!buf)
879 return NULL;
880
881 buf->ccontext.DataOffset = cpu_to_le16(offsetof
882 (struct create_durable, Data));
883 buf->ccontext.DataLength = cpu_to_le32(16);
884 buf->ccontext.NameOffset = cpu_to_le16(offsetof
885 (struct create_durable, Name));
886 buf->ccontext.NameLength = cpu_to_le16(4);
887 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
888 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
889 buf->Name[0] = 'D';
890 buf->Name[1] = 'H';
891 buf->Name[2] = 'n';
892 buf->Name[3] = 'C';
893 return buf;
894 }
895
896 static __u8
897 parse_lease_state(struct smb2_create_rsp *rsp)
898 {
899 char *data_offset;
900 struct create_lease *lc;
901 bool found = false;
902 unsigned int next = 0;
903 char *name;
904
905 data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
906 lc = (struct create_lease *)data_offset;
907 do {
908 lc = (struct create_lease *)((char *)lc + next);
909 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
910 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
911 strncmp(name, "RqLs", 4)) {
912 next = le32_to_cpu(lc->ccontext.Next);
913 continue;
914 }
915 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
916 return SMB2_OPLOCK_LEVEL_NOCHANGE;
917 found = true;
918 break;
919 } while (next != 0);
920
921 if (!found)
922 return 0;
923
924 return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
925 }
926
927 static int
928 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
929 {
930 struct smb2_create_req *req = iov[0].iov_base;
931 unsigned int num = *num_iovec;
932
933 iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
934 if (iov[num].iov_base == NULL)
935 return -ENOMEM;
936 iov[num].iov_len = sizeof(struct create_lease);
937 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
938 if (!req->CreateContextsOffset)
939 req->CreateContextsOffset = cpu_to_le32(
940 sizeof(struct smb2_create_req) - 4 +
941 iov[num - 1].iov_len);
942 req->CreateContextsLength = cpu_to_le32(
943 le32_to_cpu(req->CreateContextsLength) +
944 sizeof(struct create_lease));
945 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
946 *num_iovec = num + 1;
947 return 0;
948 }
949
950 static int
951 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
952 struct cifs_open_parms *oparms)
953 {
954 struct smb2_create_req *req = iov[0].iov_base;
955 unsigned int num = *num_iovec;
956
957 if (oparms->reconnect) {
958 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
959 /* indicate that we don't need to relock the file */
960 oparms->reconnect = false;
961 } else
962 iov[num].iov_base = create_durable_buf();
963 if (iov[num].iov_base == NULL)
964 return -ENOMEM;
965 iov[num].iov_len = sizeof(struct create_durable);
966 if (!req->CreateContextsOffset)
967 req->CreateContextsOffset =
968 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
969 iov[1].iov_len);
970 req->CreateContextsLength =
971 cpu_to_le32(le32_to_cpu(req->CreateContextsLength) +
972 sizeof(struct create_durable));
973 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
974 *num_iovec = num + 1;
975 return 0;
976 }
977
978 int
979 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
980 __u8 *oplock, struct smb2_file_all_info *buf,
981 struct smb2_err_rsp **err_buf)
982 {
983 struct smb2_create_req *req;
984 struct smb2_create_rsp *rsp;
985 struct TCP_Server_Info *server;
986 struct cifs_tcon *tcon = oparms->tcon;
987 struct cifs_ses *ses = tcon->ses;
988 struct kvec iov[4];
989 int resp_buftype;
990 int uni_path_len;
991 __le16 *copy_path = NULL;
992 int copy_size;
993 int rc = 0;
994 unsigned int num_iovecs = 2;
995 __u32 file_attributes = 0;
996
997 cifs_dbg(FYI, "create/open\n");
998
999 if (ses && (ses->server))
1000 server = ses->server;
1001 else
1002 return -EIO;
1003
1004 rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1005 if (rc)
1006 return rc;
1007
1008 if (oparms->create_options & CREATE_OPTION_READONLY)
1009 file_attributes |= ATTR_READONLY;
1010
1011 req->ImpersonationLevel = IL_IMPERSONATION;
1012 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1013 /* File attributes ignored on open (used in create though) */
1014 req->FileAttributes = cpu_to_le32(file_attributes);
1015 req->ShareAccess = FILE_SHARE_ALL_LE;
1016 req->CreateDisposition = cpu_to_le32(oparms->disposition);
1017 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1018 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1019 /* do not count rfc1001 len field */
1020 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1021
1022 iov[0].iov_base = (char *)req;
1023 /* 4 for rfc1002 length field */
1024 iov[0].iov_len = get_rfc1002_length(req) + 4;
1025
1026 /* MUST set path len (NameLength) to 0 opening root of share */
1027 req->NameLength = cpu_to_le16(uni_path_len - 2);
1028 /* -1 since last byte is buf[0] which is sent below (path) */
1029 iov[0].iov_len--;
1030 if (uni_path_len % 8 != 0) {
1031 copy_size = uni_path_len / 8 * 8;
1032 if (copy_size < uni_path_len)
1033 copy_size += 8;
1034
1035 copy_path = kzalloc(copy_size, GFP_KERNEL);
1036 if (!copy_path)
1037 return -ENOMEM;
1038 memcpy((char *)copy_path, (const char *)path,
1039 uni_path_len);
1040 uni_path_len = copy_size;
1041 path = copy_path;
1042 }
1043
1044 iov[1].iov_len = uni_path_len;
1045 iov[1].iov_base = path;
1046 /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1047 inc_rfc1001_len(req, uni_path_len - 1);
1048
1049 if (!server->oplocks)
1050 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1051
1052 if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1053 *oplock == SMB2_OPLOCK_LEVEL_NONE)
1054 req->RequestedOplockLevel = *oplock;
1055 else {
1056 rc = add_lease_context(iov, &num_iovecs, oplock);
1057 if (rc) {
1058 cifs_small_buf_release(req);
1059 kfree(copy_path);
1060 return rc;
1061 }
1062 }
1063
1064 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1065 /* need to set Next field of lease context if we request it */
1066 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1067 struct create_context *ccontext =
1068 (struct create_context *)iov[num_iovecs-1].iov_base;
1069 ccontext->Next =
1070 cpu_to_le32(sizeof(struct create_lease));
1071 }
1072 rc = add_durable_context(iov, &num_iovecs, oparms);
1073 if (rc) {
1074 cifs_small_buf_release(req);
1075 kfree(copy_path);
1076 kfree(iov[num_iovecs-1].iov_base);
1077 return rc;
1078 }
1079 }
1080
1081 rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1082 rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1083
1084 if (rc != 0) {
1085 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1086 if (err_buf)
1087 *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1088 GFP_KERNEL);
1089 goto creat_exit;
1090 }
1091
1092 oparms->fid->persistent_fid = rsp->PersistentFileId;
1093 oparms->fid->volatile_fid = rsp->VolatileFileId;
1094
1095 if (buf) {
1096 memcpy(buf, &rsp->CreationTime, 32);
1097 buf->AllocationSize = rsp->AllocationSize;
1098 buf->EndOfFile = rsp->EndofFile;
1099 buf->Attributes = rsp->FileAttributes;
1100 buf->NumberOfLinks = cpu_to_le32(1);
1101 buf->DeletePending = 0;
1102 }
1103
1104 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1105 *oplock = parse_lease_state(rsp);
1106 else
1107 *oplock = rsp->OplockLevel;
1108 creat_exit:
1109 kfree(copy_path);
1110 free_rsp_buf(resp_buftype, rsp);
1111 return rc;
1112 }
1113
1114 /*
1115 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
1116 */
1117 int
1118 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1119 u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1120 u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1121 {
1122 struct smb2_ioctl_req *req;
1123 struct smb2_ioctl_rsp *rsp;
1124 struct TCP_Server_Info *server;
1125 struct cifs_ses *ses = tcon->ses;
1126 struct kvec iov[2];
1127 int resp_buftype;
1128 int num_iovecs;
1129 int rc = 0;
1130
1131 cifs_dbg(FYI, "SMB2 IOCTL\n");
1132
1133 /* zero out returned data len, in case of error */
1134 if (plen)
1135 *plen = 0;
1136
1137 if (ses && (ses->server))
1138 server = ses->server;
1139 else
1140 return -EIO;
1141
1142 rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1143 if (rc)
1144 return rc;
1145
1146 req->CtlCode = cpu_to_le32(opcode);
1147 req->PersistentFileId = persistent_fid;
1148 req->VolatileFileId = volatile_fid;
1149
1150 if (indatalen) {
1151 req->InputCount = cpu_to_le32(indatalen);
1152 /* do not set InputOffset if no input data */
1153 req->InputOffset =
1154 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1155 iov[1].iov_base = in_data;
1156 iov[1].iov_len = indatalen;
1157 num_iovecs = 2;
1158 } else
1159 num_iovecs = 1;
1160
1161 req->OutputOffset = 0;
1162 req->OutputCount = 0; /* MBZ */
1163
1164 /*
1165 * Could increase MaxOutputResponse, but that would require more
1166 * than one credit. Windows typically sets this smaller, but for some
1167 * ioctls it may be useful to allow server to send more. No point
1168 * limiting what the server can send as long as fits in one credit
1169 */
1170 req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1171
1172 if (is_fsctl)
1173 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1174 else
1175 req->Flags = 0;
1176
1177 iov[0].iov_base = (char *)req;
1178 /* 4 for rfc1002 length field */
1179 iov[0].iov_len = get_rfc1002_length(req) + 4;
1180
1181 if (indatalen)
1182 inc_rfc1001_len(req, indatalen);
1183
1184 rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1185 rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1186
1187 if (rc != 0) {
1188 if (tcon)
1189 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1190 goto ioctl_exit;
1191 }
1192
1193 /* check if caller wants to look at return data or just return rc */
1194 if ((plen == NULL) || (out_data == NULL))
1195 goto ioctl_exit;
1196
1197 *plen = le32_to_cpu(rsp->OutputCount);
1198
1199 /* We check for obvious errors in the output buffer length and offset */
1200 if (*plen == 0)
1201 goto ioctl_exit; /* server returned no data */
1202 else if (*plen > 0xFF00) {
1203 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1204 *plen = 0;
1205 rc = -EIO;
1206 goto ioctl_exit;
1207 }
1208
1209 if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1210 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1211 le32_to_cpu(rsp->OutputOffset));
1212 *plen = 0;
1213 rc = -EIO;
1214 goto ioctl_exit;
1215 }
1216
1217 *out_data = kmalloc(*plen, GFP_KERNEL);
1218 if (*out_data == NULL) {
1219 rc = -ENOMEM;
1220 goto ioctl_exit;
1221 }
1222
1223 memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1224 *plen);
1225 ioctl_exit:
1226 free_rsp_buf(resp_buftype, rsp);
1227 return rc;
1228 }
1229
1230 int
1231 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1232 u64 persistent_fid, u64 volatile_fid)
1233 {
1234 struct smb2_close_req *req;
1235 struct smb2_close_rsp *rsp;
1236 struct TCP_Server_Info *server;
1237 struct cifs_ses *ses = tcon->ses;
1238 struct kvec iov[1];
1239 int resp_buftype;
1240 int rc = 0;
1241
1242 cifs_dbg(FYI, "Close\n");
1243
1244 if (ses && (ses->server))
1245 server = ses->server;
1246 else
1247 return -EIO;
1248
1249 rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1250 if (rc)
1251 return rc;
1252
1253 req->PersistentFileId = persistent_fid;
1254 req->VolatileFileId = volatile_fid;
1255
1256 iov[0].iov_base = (char *)req;
1257 /* 4 for rfc1002 length field */
1258 iov[0].iov_len = get_rfc1002_length(req) + 4;
1259
1260 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1261 rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1262
1263 if (rc != 0) {
1264 if (tcon)
1265 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1266 goto close_exit;
1267 }
1268
1269 /* BB FIXME - decode close response, update inode for caching */
1270
1271 close_exit:
1272 free_rsp_buf(resp_buftype, rsp);
1273 return rc;
1274 }
1275
1276 static int
1277 validate_buf(unsigned int offset, unsigned int buffer_length,
1278 struct smb2_hdr *hdr, unsigned int min_buf_size)
1279
1280 {
1281 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1282 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1283 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1284 char *end_of_buf = begin_of_buf + buffer_length;
1285
1286
1287 if (buffer_length < min_buf_size) {
1288 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1289 buffer_length, min_buf_size);
1290 return -EINVAL;
1291 }
1292
1293 /* check if beyond RFC1001 maximum length */
1294 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1295 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1296 buffer_length, smb_len);
1297 return -EINVAL;
1298 }
1299
1300 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1301 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1302 return -EINVAL;
1303 }
1304
1305 return 0;
1306 }
1307
1308 /*
1309 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1310 * Caller must free buffer.
1311 */
1312 static int
1313 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1314 struct smb2_hdr *hdr, unsigned int minbufsize,
1315 char *data)
1316
1317 {
1318 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1319 int rc;
1320
1321 if (!data)
1322 return -EINVAL;
1323
1324 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1325 if (rc)
1326 return rc;
1327
1328 memcpy(data, begin_of_buf, buffer_length);
1329
1330 return 0;
1331 }
1332
1333 static int
1334 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1335 u64 persistent_fid, u64 volatile_fid, u8 info_class,
1336 size_t output_len, size_t min_len, void *data)
1337 {
1338 struct smb2_query_info_req *req;
1339 struct smb2_query_info_rsp *rsp = NULL;
1340 struct kvec iov[2];
1341 int rc = 0;
1342 int resp_buftype;
1343 struct TCP_Server_Info *server;
1344 struct cifs_ses *ses = tcon->ses;
1345
1346 cifs_dbg(FYI, "Query Info\n");
1347
1348 if (ses && (ses->server))
1349 server = ses->server;
1350 else
1351 return -EIO;
1352
1353 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1354 if (rc)
1355 return rc;
1356
1357 req->InfoType = SMB2_O_INFO_FILE;
1358 req->FileInfoClass = info_class;
1359 req->PersistentFileId = persistent_fid;
1360 req->VolatileFileId = volatile_fid;
1361 /* 4 for rfc1002 length field and 1 for Buffer */
1362 req->InputBufferOffset =
1363 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1364 req->OutputBufferLength = cpu_to_le32(output_len);
1365
1366 iov[0].iov_base = (char *)req;
1367 /* 4 for rfc1002 length field */
1368 iov[0].iov_len = get_rfc1002_length(req) + 4;
1369
1370 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1371 rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1372
1373 if (rc) {
1374 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1375 goto qinf_exit;
1376 }
1377
1378 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1379 le32_to_cpu(rsp->OutputBufferLength),
1380 &rsp->hdr, min_len, data);
1381
1382 qinf_exit:
1383 free_rsp_buf(resp_buftype, rsp);
1384 return rc;
1385 }
1386
1387 int
1388 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1389 u64 persistent_fid, u64 volatile_fid,
1390 struct smb2_file_all_info *data)
1391 {
1392 return query_info(xid, tcon, persistent_fid, volatile_fid,
1393 FILE_ALL_INFORMATION,
1394 sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1395 sizeof(struct smb2_file_all_info), data);
1396 }
1397
1398 int
1399 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1400 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1401 {
1402 return query_info(xid, tcon, persistent_fid, volatile_fid,
1403 FILE_INTERNAL_INFORMATION,
1404 sizeof(struct smb2_file_internal_info),
1405 sizeof(struct smb2_file_internal_info), uniqueid);
1406 }
1407
1408 /*
1409 * This is a no-op for now. We're not really interested in the reply, but
1410 * rather in the fact that the server sent one and that server->lstrp
1411 * gets updated.
1412 *
1413 * FIXME: maybe we should consider checking that the reply matches request?
1414 */
1415 static void
1416 smb2_echo_callback(struct mid_q_entry *mid)
1417 {
1418 struct TCP_Server_Info *server = mid->callback_data;
1419 struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1420 unsigned int credits_received = 1;
1421
1422 if (mid->mid_state == MID_RESPONSE_RECEIVED)
1423 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1424
1425 DeleteMidQEntry(mid);
1426 add_credits(server, credits_received, CIFS_ECHO_OP);
1427 }
1428
1429 int
1430 SMB2_echo(struct TCP_Server_Info *server)
1431 {
1432 struct smb2_echo_req *req;
1433 int rc = 0;
1434 struct kvec iov;
1435 struct smb_rqst rqst = { .rq_iov = &iov,
1436 .rq_nvec = 1 };
1437
1438 cifs_dbg(FYI, "In echo request\n");
1439
1440 rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1441 if (rc)
1442 return rc;
1443
1444 req->hdr.CreditRequest = cpu_to_le16(1);
1445
1446 iov.iov_base = (char *)req;
1447 /* 4 for rfc1002 length field */
1448 iov.iov_len = get_rfc1002_length(req) + 4;
1449
1450 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1451 CIFS_ECHO_OP);
1452 if (rc)
1453 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1454
1455 cifs_small_buf_release(req);
1456 return rc;
1457 }
1458
1459 int
1460 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1461 u64 volatile_fid)
1462 {
1463 struct smb2_flush_req *req;
1464 struct TCP_Server_Info *server;
1465 struct cifs_ses *ses = tcon->ses;
1466 struct kvec iov[1];
1467 int resp_buftype;
1468 int rc = 0;
1469
1470 cifs_dbg(FYI, "Flush\n");
1471
1472 if (ses && (ses->server))
1473 server = ses->server;
1474 else
1475 return -EIO;
1476
1477 rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1478 if (rc)
1479 return rc;
1480
1481 req->PersistentFileId = persistent_fid;
1482 req->VolatileFileId = volatile_fid;
1483
1484 iov[0].iov_base = (char *)req;
1485 /* 4 for rfc1002 length field */
1486 iov[0].iov_len = get_rfc1002_length(req) + 4;
1487
1488 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1489
1490 if ((rc != 0) && tcon)
1491 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1492
1493 free_rsp_buf(resp_buftype, iov[0].iov_base);
1494 return rc;
1495 }
1496
1497 /*
1498 * To form a chain of read requests, any read requests after the first should
1499 * have the end_of_chain boolean set to true.
1500 */
1501 static int
1502 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1503 unsigned int remaining_bytes, int request_type)
1504 {
1505 int rc = -EACCES;
1506 struct smb2_read_req *req = NULL;
1507
1508 rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1509 if (rc)
1510 return rc;
1511 if (io_parms->tcon->ses->server == NULL)
1512 return -ECONNABORTED;
1513
1514 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1515
1516 req->PersistentFileId = io_parms->persistent_fid;
1517 req->VolatileFileId = io_parms->volatile_fid;
1518 req->ReadChannelInfoOffset = 0; /* reserved */
1519 req->ReadChannelInfoLength = 0; /* reserved */
1520 req->Channel = 0; /* reserved */
1521 req->MinimumCount = 0;
1522 req->Length = cpu_to_le32(io_parms->length);
1523 req->Offset = cpu_to_le64(io_parms->offset);
1524
1525 if (request_type & CHAINED_REQUEST) {
1526 if (!(request_type & END_OF_CHAIN)) {
1527 /* 4 for rfc1002 length field */
1528 req->hdr.NextCommand =
1529 cpu_to_le32(get_rfc1002_length(req) + 4);
1530 } else /* END_OF_CHAIN */
1531 req->hdr.NextCommand = 0;
1532 if (request_type & RELATED_REQUEST) {
1533 req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1534 /*
1535 * Related requests use info from previous read request
1536 * in chain.
1537 */
1538 req->hdr.SessionId = 0xFFFFFFFF;
1539 req->hdr.TreeId = 0xFFFFFFFF;
1540 req->PersistentFileId = 0xFFFFFFFF;
1541 req->VolatileFileId = 0xFFFFFFFF;
1542 }
1543 }
1544 if (remaining_bytes > io_parms->length)
1545 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1546 else
1547 req->RemainingBytes = 0;
1548
1549 iov[0].iov_base = (char *)req;
1550 /* 4 for rfc1002 length field */
1551 iov[0].iov_len = get_rfc1002_length(req) + 4;
1552 return rc;
1553 }
1554
1555 static void
1556 smb2_readv_callback(struct mid_q_entry *mid)
1557 {
1558 struct cifs_readdata *rdata = mid->callback_data;
1559 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1560 struct TCP_Server_Info *server = tcon->ses->server;
1561 struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1562 unsigned int credits_received = 1;
1563 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1564 .rq_nvec = 1,
1565 .rq_pages = rdata->pages,
1566 .rq_npages = rdata->nr_pages,
1567 .rq_pagesz = rdata->pagesz,
1568 .rq_tailsz = rdata->tailsz };
1569
1570 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1571 __func__, mid->mid, mid->mid_state, rdata->result,
1572 rdata->bytes);
1573
1574 switch (mid->mid_state) {
1575 case MID_RESPONSE_RECEIVED:
1576 credits_received = le16_to_cpu(buf->CreditRequest);
1577 /* result already set, check signature */
1578 if (server->sign) {
1579 int rc;
1580
1581 rc = smb2_verify_signature(&rqst, server);
1582 if (rc)
1583 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1584 rc);
1585 }
1586 /* FIXME: should this be counted toward the initiating task? */
1587 task_io_account_read(rdata->bytes);
1588 cifs_stats_bytes_read(tcon, rdata->bytes);
1589 break;
1590 case MID_REQUEST_SUBMITTED:
1591 case MID_RETRY_NEEDED:
1592 rdata->result = -EAGAIN;
1593 break;
1594 default:
1595 if (rdata->result != -ENODATA)
1596 rdata->result = -EIO;
1597 }
1598
1599 if (rdata->result)
1600 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1601
1602 queue_work(cifsiod_wq, &rdata->work);
1603 DeleteMidQEntry(mid);
1604 add_credits(server, credits_received, 0);
1605 }
1606
1607 /* smb2_async_readv - send an async write, and set up mid to handle result */
1608 int
1609 smb2_async_readv(struct cifs_readdata *rdata)
1610 {
1611 int rc;
1612 struct smb2_hdr *buf;
1613 struct cifs_io_parms io_parms;
1614 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1615 .rq_nvec = 1 };
1616
1617 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1618 __func__, rdata->offset, rdata->bytes);
1619
1620 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1621 io_parms.offset = rdata->offset;
1622 io_parms.length = rdata->bytes;
1623 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1624 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1625 io_parms.pid = rdata->pid;
1626 rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1627 if (rc)
1628 return rc;
1629
1630 buf = (struct smb2_hdr *)rdata->iov.iov_base;
1631 /* 4 for rfc1002 length field */
1632 rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1633
1634 kref_get(&rdata->refcount);
1635 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1636 cifs_readv_receive, smb2_readv_callback,
1637 rdata, 0);
1638 if (rc) {
1639 kref_put(&rdata->refcount, cifs_readdata_release);
1640 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1641 }
1642
1643 cifs_small_buf_release(buf);
1644 return rc;
1645 }
1646
1647 int
1648 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1649 unsigned int *nbytes, char **buf, int *buf_type)
1650 {
1651 int resp_buftype, rc = -EACCES;
1652 struct smb2_read_rsp *rsp = NULL;
1653 struct kvec iov[1];
1654
1655 *nbytes = 0;
1656 rc = smb2_new_read_req(iov, io_parms, 0, 0);
1657 if (rc)
1658 return rc;
1659
1660 rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1661 &resp_buftype, CIFS_LOG_ERROR);
1662
1663 rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1664
1665 if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1666 free_rsp_buf(resp_buftype, iov[0].iov_base);
1667 return 0;
1668 }
1669
1670 if (rc) {
1671 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1672 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1673 } else {
1674 *nbytes = le32_to_cpu(rsp->DataLength);
1675 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1676 (*nbytes > io_parms->length)) {
1677 cifs_dbg(FYI, "bad length %d for count %d\n",
1678 *nbytes, io_parms->length);
1679 rc = -EIO;
1680 *nbytes = 0;
1681 }
1682 }
1683
1684 if (*buf) {
1685 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1686 *nbytes);
1687 free_rsp_buf(resp_buftype, iov[0].iov_base);
1688 } else if (resp_buftype != CIFS_NO_BUFFER) {
1689 *buf = iov[0].iov_base;
1690 if (resp_buftype == CIFS_SMALL_BUFFER)
1691 *buf_type = CIFS_SMALL_BUFFER;
1692 else if (resp_buftype == CIFS_LARGE_BUFFER)
1693 *buf_type = CIFS_LARGE_BUFFER;
1694 }
1695 return rc;
1696 }
1697
1698 /*
1699 * Check the mid_state and signature on received buffer (if any), and queue the
1700 * workqueue completion task.
1701 */
1702 static void
1703 smb2_writev_callback(struct mid_q_entry *mid)
1704 {
1705 struct cifs_writedata *wdata = mid->callback_data;
1706 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1707 unsigned int written;
1708 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1709 unsigned int credits_received = 1;
1710
1711 switch (mid->mid_state) {
1712 case MID_RESPONSE_RECEIVED:
1713 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1714 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1715 if (wdata->result != 0)
1716 break;
1717
1718 written = le32_to_cpu(rsp->DataLength);
1719 /*
1720 * Mask off high 16 bits when bytes written as returned
1721 * by the server is greater than bytes requested by the
1722 * client. OS/2 servers are known to set incorrect
1723 * CountHigh values.
1724 */
1725 if (written > wdata->bytes)
1726 written &= 0xFFFF;
1727
1728 if (written < wdata->bytes)
1729 wdata->result = -ENOSPC;
1730 else
1731 wdata->bytes = written;
1732 break;
1733 case MID_REQUEST_SUBMITTED:
1734 case MID_RETRY_NEEDED:
1735 wdata->result = -EAGAIN;
1736 break;
1737 default:
1738 wdata->result = -EIO;
1739 break;
1740 }
1741
1742 if (wdata->result)
1743 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1744
1745 queue_work(cifsiod_wq, &wdata->work);
1746 DeleteMidQEntry(mid);
1747 add_credits(tcon->ses->server, credits_received, 0);
1748 }
1749
1750 /* smb2_async_writev - send an async write, and set up mid to handle result */
1751 int
1752 smb2_async_writev(struct cifs_writedata *wdata)
1753 {
1754 int rc = -EACCES;
1755 struct smb2_write_req *req = NULL;
1756 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1757 struct kvec iov;
1758 struct smb_rqst rqst;
1759
1760 rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1761 if (rc)
1762 goto async_writev_out;
1763
1764 req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1765
1766 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1767 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1768 req->WriteChannelInfoOffset = 0;
1769 req->WriteChannelInfoLength = 0;
1770 req->Channel = 0;
1771 req->Offset = cpu_to_le64(wdata->offset);
1772 /* 4 for rfc1002 length field */
1773 req->DataOffset = cpu_to_le16(
1774 offsetof(struct smb2_write_req, Buffer) - 4);
1775 req->RemainingBytes = 0;
1776
1777 /* 4 for rfc1002 length field and 1 for Buffer */
1778 iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1779 iov.iov_base = req;
1780
1781 rqst.rq_iov = &iov;
1782 rqst.rq_nvec = 1;
1783 rqst.rq_pages = wdata->pages;
1784 rqst.rq_npages = wdata->nr_pages;
1785 rqst.rq_pagesz = wdata->pagesz;
1786 rqst.rq_tailsz = wdata->tailsz;
1787
1788 cifs_dbg(FYI, "async write at %llu %u bytes\n",
1789 wdata->offset, wdata->bytes);
1790
1791 req->Length = cpu_to_le32(wdata->bytes);
1792
1793 inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1794
1795 kref_get(&wdata->refcount);
1796 rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1797 smb2_writev_callback, wdata, 0);
1798
1799 if (rc) {
1800 kref_put(&wdata->refcount, cifs_writedata_release);
1801 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1802 }
1803
1804 async_writev_out:
1805 cifs_small_buf_release(req);
1806 return rc;
1807 }
1808
1809 /*
1810 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1811 * The length field from io_parms must be at least 1 and indicates a number of
1812 * elements with data to write that begins with position 1 in iov array. All
1813 * data length is specified by count.
1814 */
1815 int
1816 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1817 unsigned int *nbytes, struct kvec *iov, int n_vec)
1818 {
1819 int rc = 0;
1820 struct smb2_write_req *req = NULL;
1821 struct smb2_write_rsp *rsp = NULL;
1822 int resp_buftype;
1823 *nbytes = 0;
1824
1825 if (n_vec < 1)
1826 return rc;
1827
1828 rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1829 if (rc)
1830 return rc;
1831
1832 if (io_parms->tcon->ses->server == NULL)
1833 return -ECONNABORTED;
1834
1835 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1836
1837 req->PersistentFileId = io_parms->persistent_fid;
1838 req->VolatileFileId = io_parms->volatile_fid;
1839 req->WriteChannelInfoOffset = 0;
1840 req->WriteChannelInfoLength = 0;
1841 req->Channel = 0;
1842 req->Length = cpu_to_le32(io_parms->length);
1843 req->Offset = cpu_to_le64(io_parms->offset);
1844 /* 4 for rfc1002 length field */
1845 req->DataOffset = cpu_to_le16(
1846 offsetof(struct smb2_write_req, Buffer) - 4);
1847 req->RemainingBytes = 0;
1848
1849 iov[0].iov_base = (char *)req;
1850 /* 4 for rfc1002 length field and 1 for Buffer */
1851 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1852
1853 /* length of entire message including data to be written */
1854 inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1855
1856 rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1857 &resp_buftype, 0);
1858 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1859
1860 if (rc) {
1861 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1862 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1863 } else
1864 *nbytes = le32_to_cpu(rsp->DataLength);
1865
1866 free_rsp_buf(resp_buftype, rsp);
1867 return rc;
1868 }
1869
1870 static unsigned int
1871 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1872 {
1873 int len;
1874 unsigned int entrycount = 0;
1875 unsigned int next_offset = 0;
1876 FILE_DIRECTORY_INFO *entryptr;
1877
1878 if (bufstart == NULL)
1879 return 0;
1880
1881 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1882
1883 while (1) {
1884 entryptr = (FILE_DIRECTORY_INFO *)
1885 ((char *)entryptr + next_offset);
1886
1887 if ((char *)entryptr + size > end_of_buf) {
1888 cifs_dbg(VFS, "malformed search entry would overflow\n");
1889 break;
1890 }
1891
1892 len = le32_to_cpu(entryptr->FileNameLength);
1893 if ((char *)entryptr + len + size > end_of_buf) {
1894 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1895 end_of_buf);
1896 break;
1897 }
1898
1899 *lastentry = (char *)entryptr;
1900 entrycount++;
1901
1902 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1903 if (!next_offset)
1904 break;
1905 }
1906
1907 return entrycount;
1908 }
1909
1910 /*
1911 * Readdir/FindFirst
1912 */
1913 int
1914 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1915 u64 persistent_fid, u64 volatile_fid, int index,
1916 struct cifs_search_info *srch_inf)
1917 {
1918 struct smb2_query_directory_req *req;
1919 struct smb2_query_directory_rsp *rsp = NULL;
1920 struct kvec iov[2];
1921 int rc = 0;
1922 int len;
1923 int resp_buftype;
1924 unsigned char *bufptr;
1925 struct TCP_Server_Info *server;
1926 struct cifs_ses *ses = tcon->ses;
1927 __le16 asteriks = cpu_to_le16('*');
1928 char *end_of_smb;
1929 unsigned int output_size = CIFSMaxBufSize;
1930 size_t info_buf_size;
1931
1932 if (ses && (ses->server))
1933 server = ses->server;
1934 else
1935 return -EIO;
1936
1937 rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1938 if (rc)
1939 return rc;
1940
1941 switch (srch_inf->info_level) {
1942 case SMB_FIND_FILE_DIRECTORY_INFO:
1943 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1944 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1945 break;
1946 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1947 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1948 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1949 break;
1950 default:
1951 cifs_dbg(VFS, "info level %u isn't supported\n",
1952 srch_inf->info_level);
1953 rc = -EINVAL;
1954 goto qdir_exit;
1955 }
1956
1957 req->FileIndex = cpu_to_le32(index);
1958 req->PersistentFileId = persistent_fid;
1959 req->VolatileFileId = volatile_fid;
1960
1961 len = 0x2;
1962 bufptr = req->Buffer;
1963 memcpy(bufptr, &asteriks, len);
1964
1965 req->FileNameOffset =
1966 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1967 req->FileNameLength = cpu_to_le16(len);
1968 /*
1969 * BB could be 30 bytes or so longer if we used SMB2 specific
1970 * buffer lengths, but this is safe and close enough.
1971 */
1972 output_size = min_t(unsigned int, output_size, server->maxBuf);
1973 output_size = min_t(unsigned int, output_size, 2 << 15);
1974 req->OutputBufferLength = cpu_to_le32(output_size);
1975
1976 iov[0].iov_base = (char *)req;
1977 /* 4 for RFC1001 length and 1 for Buffer */
1978 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1979
1980 iov[1].iov_base = (char *)(req->Buffer);
1981 iov[1].iov_len = len;
1982
1983 inc_rfc1001_len(req, len - 1 /* Buffer */);
1984
1985 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1986 rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1987
1988 if (rc) {
1989 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1990 goto qdir_exit;
1991 }
1992
1993 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1994 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1995 info_buf_size);
1996 if (rc)
1997 goto qdir_exit;
1998
1999 srch_inf->unicode = true;
2000
2001 if (srch_inf->ntwrk_buf_start) {
2002 if (srch_inf->smallBuf)
2003 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2004 else
2005 cifs_buf_release(srch_inf->ntwrk_buf_start);
2006 }
2007 srch_inf->ntwrk_buf_start = (char *)rsp;
2008 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2009 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2010 /* 4 for rfc1002 length field */
2011 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2012 srch_inf->entries_in_buffer =
2013 num_entries(srch_inf->srch_entries_start, end_of_smb,
2014 &srch_inf->last_entry, info_buf_size);
2015 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2016 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2017 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2018 srch_inf->srch_entries_start, srch_inf->last_entry);
2019 if (resp_buftype == CIFS_LARGE_BUFFER)
2020 srch_inf->smallBuf = false;
2021 else if (resp_buftype == CIFS_SMALL_BUFFER)
2022 srch_inf->smallBuf = true;
2023 else
2024 cifs_dbg(VFS, "illegal search buffer type\n");
2025
2026 if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2027 srch_inf->endOfSearch = 1;
2028 else
2029 srch_inf->endOfSearch = 0;
2030
2031 return rc;
2032
2033 qdir_exit:
2034 free_rsp_buf(resp_buftype, rsp);
2035 return rc;
2036 }
2037
2038 static int
2039 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2040 u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2041 unsigned int num, void **data, unsigned int *size)
2042 {
2043 struct smb2_set_info_req *req;
2044 struct smb2_set_info_rsp *rsp = NULL;
2045 struct kvec *iov;
2046 int rc = 0;
2047 int resp_buftype;
2048 unsigned int i;
2049 struct TCP_Server_Info *server;
2050 struct cifs_ses *ses = tcon->ses;
2051
2052 if (ses && (ses->server))
2053 server = ses->server;
2054 else
2055 return -EIO;
2056
2057 if (!num)
2058 return -EINVAL;
2059
2060 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2061 if (!iov)
2062 return -ENOMEM;
2063
2064 rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2065 if (rc) {
2066 kfree(iov);
2067 return rc;
2068 }
2069
2070 req->hdr.ProcessId = cpu_to_le32(pid);
2071
2072 req->InfoType = SMB2_O_INFO_FILE;
2073 req->FileInfoClass = info_class;
2074 req->PersistentFileId = persistent_fid;
2075 req->VolatileFileId = volatile_fid;
2076
2077 /* 4 for RFC1001 length and 1 for Buffer */
2078 req->BufferOffset =
2079 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2080 req->BufferLength = cpu_to_le32(*size);
2081
2082 inc_rfc1001_len(req, *size - 1 /* Buffer */);
2083
2084 memcpy(req->Buffer, *data, *size);
2085
2086 iov[0].iov_base = (char *)req;
2087 /* 4 for RFC1001 length */
2088 iov[0].iov_len = get_rfc1002_length(req) + 4;
2089
2090 for (i = 1; i < num; i++) {
2091 inc_rfc1001_len(req, size[i]);
2092 le32_add_cpu(&req->BufferLength, size[i]);
2093 iov[i].iov_base = (char *)data[i];
2094 iov[i].iov_len = size[i];
2095 }
2096
2097 rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2098 rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2099
2100 if (rc != 0) {
2101 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2102 goto out;
2103 }
2104 out:
2105 free_rsp_buf(resp_buftype, rsp);
2106 kfree(iov);
2107 return rc;
2108 }
2109
2110 int
2111 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2112 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2113 {
2114 struct smb2_file_rename_info info;
2115 void **data;
2116 unsigned int size[2];
2117 int rc;
2118 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2119
2120 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2121 if (!data)
2122 return -ENOMEM;
2123
2124 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2125 /* 0 = fail if target already exists */
2126 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
2127 info.FileNameLength = cpu_to_le32(len);
2128
2129 data[0] = &info;
2130 size[0] = sizeof(struct smb2_file_rename_info);
2131
2132 data[1] = target_file;
2133 size[1] = len + 2 /* null */;
2134
2135 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2136 current->tgid, FILE_RENAME_INFORMATION, 2, data,
2137 size);
2138 kfree(data);
2139 return rc;
2140 }
2141
2142 int
2143 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2144 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2145 {
2146 struct smb2_file_link_info info;
2147 void **data;
2148 unsigned int size[2];
2149 int rc;
2150 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2151
2152 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2153 if (!data)
2154 return -ENOMEM;
2155
2156 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2157 /* 0 = fail if link already exists */
2158 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
2159 info.FileNameLength = cpu_to_le32(len);
2160
2161 data[0] = &info;
2162 size[0] = sizeof(struct smb2_file_link_info);
2163
2164 data[1] = target_file;
2165 size[1] = len + 2 /* null */;
2166
2167 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2168 current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2169 kfree(data);
2170 return rc;
2171 }
2172
2173 int
2174 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2175 u64 volatile_fid, u32 pid, __le64 *eof)
2176 {
2177 struct smb2_file_eof_info info;
2178 void *data;
2179 unsigned int size;
2180
2181 info.EndOfFile = *eof;
2182
2183 data = &info;
2184 size = sizeof(struct smb2_file_eof_info);
2185
2186 return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2187 FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2188 }
2189
2190 int
2191 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2192 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2193 {
2194 unsigned int size;
2195 size = sizeof(FILE_BASIC_INFO);
2196 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2197 current->tgid, FILE_BASIC_INFORMATION, 1,
2198 (void **)&buf, &size);
2199 }
2200
2201 int
2202 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2203 const u64 persistent_fid, const u64 volatile_fid,
2204 __u8 oplock_level)
2205 {
2206 int rc;
2207 struct smb2_oplock_break *req = NULL;
2208
2209 cifs_dbg(FYI, "SMB2_oplock_break\n");
2210 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2211
2212 if (rc)
2213 return rc;
2214
2215 req->VolatileFid = volatile_fid;
2216 req->PersistentFid = persistent_fid;
2217 req->OplockLevel = oplock_level;
2218 req->hdr.CreditRequest = cpu_to_le16(1);
2219
2220 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2221 /* SMB2 buffer freed by function above */
2222
2223 if (rc) {
2224 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2225 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2226 }
2227
2228 return rc;
2229 }
2230
2231 static void
2232 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2233 struct kstatfs *kst)
2234 {
2235 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2236 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2237 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2238 kst->f_bfree = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2239 kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2240 return;
2241 }
2242
2243 static int
2244 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2245 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2246 {
2247 int rc;
2248 struct smb2_query_info_req *req;
2249
2250 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2251
2252 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2253 return -EIO;
2254
2255 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2256 if (rc)
2257 return rc;
2258
2259 req->InfoType = SMB2_O_INFO_FILESYSTEM;
2260 req->FileInfoClass = level;
2261 req->PersistentFileId = persistent_fid;
2262 req->VolatileFileId = volatile_fid;
2263 /* 4 for rfc1002 length field and 1 for pad */
2264 req->InputBufferOffset =
2265 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2266 req->OutputBufferLength = cpu_to_le32(
2267 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2268
2269 iov->iov_base = (char *)req;
2270 /* 4 for rfc1002 length field */
2271 iov->iov_len = get_rfc1002_length(req) + 4;
2272 return 0;
2273 }
2274
2275 int
2276 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2277 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2278 {
2279 struct smb2_query_info_rsp *rsp = NULL;
2280 struct kvec iov;
2281 int rc = 0;
2282 int resp_buftype;
2283 struct cifs_ses *ses = tcon->ses;
2284 struct smb2_fs_full_size_info *info = NULL;
2285
2286 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2287 sizeof(struct smb2_fs_full_size_info),
2288 persistent_fid, volatile_fid);
2289 if (rc)
2290 return rc;
2291
2292 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2293 if (rc) {
2294 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2295 goto qinf_exit;
2296 }
2297 rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2298
2299 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2300 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2301 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2302 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2303 sizeof(struct smb2_fs_full_size_info));
2304 if (!rc)
2305 copy_fs_info_to_kstatfs(info, fsdata);
2306
2307 qinf_exit:
2308 free_rsp_buf(resp_buftype, iov.iov_base);
2309 return rc;
2310 }
2311
2312 int
2313 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2314 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2315 const __u32 num_lock, struct smb2_lock_element *buf)
2316 {
2317 int rc = 0;
2318 struct smb2_lock_req *req = NULL;
2319 struct kvec iov[2];
2320 int resp_buf_type;
2321 unsigned int count;
2322
2323 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2324
2325 rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2326 if (rc)
2327 return rc;
2328
2329 req->hdr.ProcessId = cpu_to_le32(pid);
2330 req->LockCount = cpu_to_le16(num_lock);
2331
2332 req->PersistentFileId = persist_fid;
2333 req->VolatileFileId = volatile_fid;
2334
2335 count = num_lock * sizeof(struct smb2_lock_element);
2336 inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2337
2338 iov[0].iov_base = (char *)req;
2339 /* 4 for rfc1002 length field and count for all locks */
2340 iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2341 iov[1].iov_base = (char *)buf;
2342 iov[1].iov_len = count;
2343
2344 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2345 rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2346 if (rc) {
2347 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2348 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2349 }
2350
2351 return rc;
2352 }
2353
2354 int
2355 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2356 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2357 const __u64 length, const __u64 offset, const __u32 lock_flags,
2358 const bool wait)
2359 {
2360 struct smb2_lock_element lock;
2361
2362 lock.Offset = cpu_to_le64(offset);
2363 lock.Length = cpu_to_le64(length);
2364 lock.Flags = cpu_to_le32(lock_flags);
2365 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2366 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2367
2368 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2369 }
2370
2371 int
2372 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2373 __u8 *lease_key, const __le32 lease_state)
2374 {
2375 int rc;
2376 struct smb2_lease_ack *req = NULL;
2377
2378 cifs_dbg(FYI, "SMB2_lease_break\n");
2379 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2380
2381 if (rc)
2382 return rc;
2383
2384 req->hdr.CreditRequest = cpu_to_le16(1);
2385 req->StructureSize = cpu_to_le16(36);
2386 inc_rfc1001_len(req, 12);
2387
2388 memcpy(req->LeaseKey, lease_key, 16);
2389 req->LeaseState = lease_state;
2390
2391 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2392 /* SMB2 buffer freed by function above */
2393
2394 if (rc) {
2395 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2396 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2397 }
2398
2399 return rc;
2400 }
Linux kernel stable tree