1 /*
2 * fs/cifs/smb2pdu.c
3 *
4 * Copyright (C) International Business Machines Corp., 2009, 2012
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
smb2_hdr_assemble(struct smb2_hdr * hdr,__le16 smb2_cmd,const struct cifs_tcon * tcon)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 hdr->TreeId = tcon->tid;
112 /* Uid is not converted */
113 if (tcon->ses)
114 hdr->SessionId = tcon->ses->Suid;
115 /* BB check following DFS flags BB */
116 /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
117 if (tcon->share_flags & SHI1005_FLAGS_DFS)
118 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
119 /* BB how does SMB2 do case sensitive? */
120 /* if (tcon->nocase)
121 hdr->Flags |= SMBFLG_CASELESS; */
122 if (tcon->ses && tcon->ses->server &&
123 (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
124 hdr->Flags |= SMB2_FLAGS_SIGNED;
125 out:
126 pdu->StructureSize2 = cpu_to_le16(parmsize);
127 return;
128 }
129
130 static int
smb2_reconnect(__le16 smb2_command,struct cifs_tcon * tcon)131 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
132 {
133 int rc = 0;
134 struct nls_table *nls_codepage;
135 struct cifs_ses *ses;
136 struct TCP_Server_Info *server;
137
138 /*
139 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
140 * check for tcp and smb session status done differently
141 * for those three - in the calling routine.
142 */
143 if (tcon == NULL)
144 return rc;
145
146 if (smb2_command == SMB2_TREE_CONNECT)
147 return rc;
148
149 if (tcon->tidStatus == CifsExiting) {
150 /*
151 * only tree disconnect, open, and write,
152 * (and ulogoff which does not have tcon)
153 * are allowed as we start force umount.
154 */
155 if ((smb2_command != SMB2_WRITE) &&
156 (smb2_command != SMB2_CREATE) &&
157 (smb2_command != SMB2_TREE_DISCONNECT)) {
158 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
159 smb2_command);
160 return -ENODEV;
161 }
162 }
163 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
164 (!tcon->ses->server))
165 return -EIO;
166
167 ses = tcon->ses;
168 server = ses->server;
169
170 /*
171 * Give demultiplex thread up to 10 seconds to reconnect, should be
172 * greater than cifs socket timeout which is 7 seconds
173 */
174 while (server->tcpStatus == CifsNeedReconnect) {
175 /*
176 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
177 * here since they are implicitly done when session drops.
178 */
179 switch (smb2_command) {
180 /*
181 * BB Should we keep oplock break and add flush to exceptions?
182 */
183 case SMB2_TREE_DISCONNECT:
184 case SMB2_CANCEL:
185 case SMB2_CLOSE:
186 case SMB2_OPLOCK_BREAK:
187 return -EAGAIN;
188 }
189
190 wait_event_interruptible_timeout(server->response_q,
191 (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
192
193 /* are we still trying to reconnect? */
194 if (server->tcpStatus != CifsNeedReconnect)
195 break;
196
197 /*
198 * on "soft" mounts we wait once. Hard mounts keep
199 * retrying until process is killed or server comes
200 * back on-line
201 */
202 if (!tcon->retry) {
203 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
204 return -EHOSTDOWN;
205 }
206 }
207
208 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
209 return rc;
210
211 nls_codepage = load_nls_default();
212
213 /*
214 * need to prevent multiple threads trying to simultaneously reconnect
215 * the same SMB session
216 */
217 mutex_lock(&tcon->ses->session_mutex);
218 rc = cifs_negotiate_protocol(0, tcon->ses);
219 if (!rc && tcon->ses->need_reconnect)
220 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
221
222 if (rc || !tcon->need_reconnect) {
223 mutex_unlock(&tcon->ses->session_mutex);
224 goto out;
225 }
226
227 cifs_mark_open_files_invalid(tcon);
228 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
229 mutex_unlock(&tcon->ses->session_mutex);
230 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
231 if (rc)
232 goto out;
233 atomic_inc(&tconInfoReconnectCount);
234 /*
235 * BB FIXME add code to check if wsize needs update due to negotiated
236 * smb buffer size shrinking.
237 */
238 out:
239 /*
240 * Check if handle based operation so we know whether we can continue
241 * or not without returning to caller to reset file handle.
242 */
243 /*
244 * BB Is flush done by server on drop of tcp session? Should we special
245 * case it and skip above?
246 */
247 switch (smb2_command) {
248 case SMB2_FLUSH:
249 case SMB2_READ:
250 case SMB2_WRITE:
251 case SMB2_LOCK:
252 case SMB2_IOCTL:
253 case SMB2_QUERY_DIRECTORY:
254 case SMB2_CHANGE_NOTIFY:
255 case SMB2_QUERY_INFO:
256 case SMB2_SET_INFO:
257 return -EAGAIN;
258 }
259 unload_nls(nls_codepage);
260 return rc;
261 }
262
263 /*
264 * Allocate and return pointer to an SMB request hdr, and set basic
265 * SMB information in the SMB header. If the return code is zero, this
266 * function must have filled in request_buf pointer.
267 */
268 static int
small_smb2_init(__le16 smb2_command,struct cifs_tcon * tcon,void ** request_buf)269 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
270 void **request_buf)
271 {
272 int rc = 0;
273
274 rc = smb2_reconnect(smb2_command, tcon);
275 if (rc)
276 return rc;
277
278 /* BB eventually switch this to SMB2 specific small buf size */
279 *request_buf = cifs_small_buf_get();
280 if (*request_buf == NULL) {
281 /* BB should we add a retry in here if not a writepage? */
282 return -ENOMEM;
283 }
284
285 smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
286
287 if (tcon != NULL) {
288 #ifdef CONFIG_CIFS_STATS2
289 uint16_t com_code = le16_to_cpu(smb2_command);
290 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
291 #endif
292 cifs_stats_inc(&tcon->num_smbs_sent);
293 }
294
295 return rc;
296 }
297
298 static void
free_rsp_buf(int resp_buftype,void * rsp)299 free_rsp_buf(int resp_buftype, void *rsp)
300 {
301 if (resp_buftype == CIFS_SMALL_BUFFER)
302 cifs_small_buf_release(rsp);
303 else if (resp_buftype == CIFS_LARGE_BUFFER)
304 cifs_buf_release(rsp);
305 }
306
307
308 /*
309 *
310 * SMB2 Worker functions follow:
311 *
312 * The general structure of the worker functions is:
313 * 1) Call smb2_init (assembles SMB2 header)
314 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
315 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
316 * 4) Decode SMB2 command specific fields in the fixed length area
317 * 5) Decode variable length data area (if any for this SMB2 command type)
318 * 6) Call free smb buffer
319 * 7) return
320 *
321 */
322
323 int
SMB2_negotiate(const unsigned int xid,struct cifs_ses * ses)324 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
325 {
326 struct smb2_negotiate_req *req;
327 struct smb2_negotiate_rsp *rsp;
328 struct kvec iov[1];
329 int rc = 0;
330 int resp_buftype;
331 struct TCP_Server_Info *server;
332 unsigned int sec_flags;
333 u16 temp = 0;
334 int blob_offset, blob_length;
335 char *security_blob;
336 int flags = CIFS_NEG_OP;
337
338 cifs_dbg(FYI, "Negotiate protocol\n");
339
340 if (ses->server)
341 server = ses->server;
342 else {
343 rc = -EIO;
344 return rc;
345 }
346
347 rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
348 if (rc)
349 return rc;
350
351 /* if any of auth flags (ie not sign or seal) are overriden use them */
352 if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
353 sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
354 else /* if override flags set only sign/seal OR them with global auth */
355 sec_flags = global_secflags | ses->overrideSecFlg;
356
357 cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
358
359 req->hdr.SessionId = 0;
360
361 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
362
363 req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
364 inc_rfc1001_len(req, 2);
365
366 /* only one of SMB2 signing flags may be set in SMB2 request */
367 if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
368 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
369 else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
370 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
371
372 req->SecurityMode = cpu_to_le16(temp);
373
374 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
375
376 memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
377
378 iov[0].iov_base = (char *)req;
379 /* 4 for rfc1002 length field */
380 iov[0].iov_len = get_rfc1002_length(req) + 4;
381
382 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
383
384 rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
385 /*
386 * No tcon so can't do
387 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
388 */
389 if (rc != 0)
390 goto neg_exit;
391
392 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
393
394 /* BB we may eventually want to match the negotiated vs. requested
395 dialect, even though we are only requesting one at a time */
396 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
397 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
398 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
399 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
400 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
401 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
402 else {
403 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
404 le16_to_cpu(rsp->DialectRevision));
405 rc = -EIO;
406 goto neg_exit;
407 }
408 server->dialect = le16_to_cpu(rsp->DialectRevision);
409
410 server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
411 server->max_read = le32_to_cpu(rsp->MaxReadSize);
412 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
413 /* BB Do we need to validate the SecurityMode? */
414 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
415 server->capabilities = le32_to_cpu(rsp->Capabilities);
416 /* Internal types */
417 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
418
419 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
420 &rsp->hdr);
421 if (blob_length == 0) {
422 cifs_dbg(VFS, "missing security blob on negprot\n");
423 rc = -EIO;
424 goto neg_exit;
425 }
426
427 cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
428 if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
429 cifs_dbg(FYI, "Signing required\n");
430 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
431 SMB2_NEGOTIATE_SIGNING_ENABLED))) {
432 cifs_dbg(VFS, "signing required but server lacks support\n");
433 rc = -EOPNOTSUPP;
434 goto neg_exit;
435 }
436 server->sec_mode |= SECMODE_SIGN_REQUIRED;
437 } else if (sec_flags & CIFSSEC_MAY_SIGN) {
438 cifs_dbg(FYI, "Signing optional\n");
439 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
440 cifs_dbg(FYI, "Server requires signing\n");
441 server->sec_mode |= SECMODE_SIGN_REQUIRED;
442 } else {
443 server->sec_mode &=
444 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
445 }
446 } else {
447 cifs_dbg(FYI, "Signing disabled\n");
448 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
449 cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
450 rc = -EOPNOTSUPP;
451 goto neg_exit;
452 }
453 server->sec_mode &=
454 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
455 }
456
457 #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
458 rc = decode_neg_token_init(security_blob, blob_length,
459 &server->sec_type);
460 if (rc == 1)
461 rc = 0;
462 else if (rc == 0) {
463 rc = -EIO;
464 goto neg_exit;
465 }
466 #endif
467
468 neg_exit:
469 free_rsp_buf(resp_buftype, rsp);
470 return rc;
471 }
472
473 int
SMB2_sess_setup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)474 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
475 const struct nls_table *nls_cp)
476 {
477 struct smb2_sess_setup_req *req;
478 struct smb2_sess_setup_rsp *rsp = NULL;
479 struct kvec iov[2];
480 int rc = 0;
481 int resp_buftype;
482 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
483 struct TCP_Server_Info *server;
484 unsigned int sec_flags;
485 u8 temp = 0;
486 u16 blob_length = 0;
487 char *security_blob;
488 char *ntlmssp_blob = NULL;
489 bool use_spnego = false; /* else use raw ntlmssp */
490
491 cifs_dbg(FYI, "Session Setup\n");
492
493 if (ses->server)
494 server = ses->server;
495 else {
496 rc = -EIO;
497 return rc;
498 }
499
500 /*
501 * If memory allocation is successful, caller of this function
502 * frees it.
503 */
504 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
505 if (!ses->ntlmssp)
506 return -ENOMEM;
507
508 ses->server->secType = RawNTLMSSP;
509
510 ssetup_ntlmssp_authenticate:
511 if (phase == NtLmChallenge)
512 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
513
514 rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
515 if (rc)
516 return rc;
517
518 /* if any of auth flags (ie not sign or seal) are overriden use them */
519 if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
520 sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
521 else /* if override flags set only sign/seal OR them with global auth */
522 sec_flags = global_secflags | ses->overrideSecFlg;
523
524 cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
525
526 req->hdr.SessionId = 0; /* First session, not a reauthenticate */
527 req->VcNumber = 0; /* MBZ */
528 /* to enable echos and oplocks */
529 req->hdr.CreditRequest = cpu_to_le16(3);
530
531 /* only one of SMB2 signing flags may be set in SMB2 request */
532 if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
533 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
534 else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
535 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
536 else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
537 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
538
539 req->SecurityMode = temp;
540 req->Capabilities = 0;
541 req->Channel = 0; /* MBZ */
542
543 iov[0].iov_base = (char *)req;
544 /* 4 for rfc1002 length field and 1 for pad */
545 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
546 if (phase == NtLmNegotiate) {
547 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
548 GFP_KERNEL);
549 if (ntlmssp_blob == NULL) {
550 rc = -ENOMEM;
551 goto ssetup_exit;
552 }
553 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
554 if (use_spnego) {
555 /* blob_length = build_spnego_ntlmssp_blob(
556 &security_blob,
557 sizeof(struct _NEGOTIATE_MESSAGE),
558 ntlmssp_blob); */
559 /* BB eventually need to add this */
560 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
561 rc = -EOPNOTSUPP;
562 kfree(ntlmssp_blob);
563 goto ssetup_exit;
564 } else {
565 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
566 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
567 security_blob = ntlmssp_blob;
568 }
569 } else if (phase == NtLmAuthenticate) {
570 req->hdr.SessionId = ses->Suid;
571 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
572 GFP_KERNEL);
573 if (ntlmssp_blob == NULL) {
574 rc = -ENOMEM;
575 goto ssetup_exit;
576 }
577 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
578 nls_cp);
579 if (rc) {
580 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
581 rc);
582 goto ssetup_exit; /* BB double check error handling */
583 }
584 if (use_spnego) {
585 /* blob_length = build_spnego_ntlmssp_blob(
586 &security_blob,
587 blob_length,
588 ntlmssp_blob); */
589 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
590 rc = -EOPNOTSUPP;
591 kfree(ntlmssp_blob);
592 goto ssetup_exit;
593 } else {
594 security_blob = ntlmssp_blob;
595 }
596 } else {
597 cifs_dbg(VFS, "illegal ntlmssp phase\n");
598 rc = -EIO;
599 goto ssetup_exit;
600 }
601
602 /* Testing shows that buffer offset must be at location of Buffer[0] */
603 req->SecurityBufferOffset =
604 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
605 1 /* pad */ - 4 /* rfc1001 len */);
606 req->SecurityBufferLength = cpu_to_le16(blob_length);
607 iov[1].iov_base = security_blob;
608 iov[1].iov_len = blob_length;
609
610 inc_rfc1001_len(req, blob_length - 1 /* pad */);
611
612 /* BB add code to build os and lm fields */
613
614 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
615 CIFS_LOG_ERROR | CIFS_NEG_OP);
616
617 kfree(security_blob);
618 rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
619 if (resp_buftype != CIFS_NO_BUFFER &&
620 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
621 if (phase != NtLmNegotiate) {
622 cifs_dbg(VFS, "Unexpected more processing error\n");
623 goto ssetup_exit;
624 }
625 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
626 le16_to_cpu(rsp->SecurityBufferOffset)) {
627 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
628 le16_to_cpu(rsp->SecurityBufferOffset));
629 rc = -EIO;
630 goto ssetup_exit;
631 }
632
633 /* NTLMSSP Negotiate sent now processing challenge (response) */
634 phase = NtLmChallenge; /* process ntlmssp challenge */
635 rc = 0; /* MORE_PROCESSING is not an error here but expected */
636 ses->Suid = rsp->hdr.SessionId;
637 rc = decode_ntlmssp_challenge(rsp->Buffer,
638 le16_to_cpu(rsp->SecurityBufferLength), ses);
639 }
640
641 /*
642 * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
643 * but at least the raw NTLMSSP case works.
644 */
645 /*
646 * No tcon so can't do
647 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
648 */
649 if (rc != 0)
650 goto ssetup_exit;
651
652 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
653 ssetup_exit:
654 free_rsp_buf(resp_buftype, rsp);
655
656 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
657 if ((phase == NtLmChallenge) && (rc == 0))
658 goto ssetup_ntlmssp_authenticate;
659 return rc;
660 }
661
662 int
SMB2_logoff(const unsigned int xid,struct cifs_ses * ses)663 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
664 {
665 struct smb2_logoff_req *req; /* response is also trivial struct */
666 int rc = 0;
667 struct TCP_Server_Info *server;
668
669 cifs_dbg(FYI, "disconnect session %p\n", ses);
670
671 if (ses && (ses->server))
672 server = ses->server;
673 else
674 return -EIO;
675
676 rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
677 if (rc)
678 return rc;
679
680 /* since no tcon, smb2_init can not do this, so do here */
681 req->hdr.SessionId = ses->Suid;
682 if (server->sec_mode & SECMODE_SIGN_REQUIRED)
683 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
684
685 rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
686 /*
687 * No tcon so can't do
688 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
689 */
690 return rc;
691 }
692
cifs_stats_fail_inc(struct cifs_tcon * tcon,uint16_t code)693 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
694 {
695 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
696 }
697
698 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
699
700 int
SMB2_tcon(const unsigned int xid,struct cifs_ses * ses,const char * tree,struct cifs_tcon * tcon,const struct nls_table * cp)701 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
702 struct cifs_tcon *tcon, const struct nls_table *cp)
703 {
704 struct smb2_tree_connect_req *req;
705 struct smb2_tree_connect_rsp *rsp = NULL;
706 struct kvec iov[2];
707 int rc = 0;
708 int resp_buftype;
709 int unc_path_len;
710 struct TCP_Server_Info *server;
711 __le16 *unc_path = NULL;
712
713 cifs_dbg(FYI, "TCON\n");
714
715 if ((ses->server) && tree)
716 server = ses->server;
717 else
718 return -EIO;
719
720 if (tcon && tcon->bad_network_name)
721 return -ENOENT;
722
723 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
724 if (unc_path == NULL)
725 return -ENOMEM;
726
727 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
728 unc_path_len *= 2;
729 if (unc_path_len < 2) {
730 kfree(unc_path);
731 return -EINVAL;
732 }
733
734 rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
735 if (rc) {
736 kfree(unc_path);
737 return rc;
738 }
739
740 if (tcon == NULL) {
741 /* since no tcon, smb2_init can not do this, so do here */
742 req->hdr.SessionId = ses->Suid;
743 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
744 req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
745 }
746
747 iov[0].iov_base = (char *)req;
748 /* 4 for rfc1002 length field and 1 for pad */
749 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
750
751 /* Testing shows that buffer offset must be at location of Buffer[0] */
752 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
753 - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
754 req->PathLength = cpu_to_le16(unc_path_len - 2);
755 iov[1].iov_base = unc_path;
756 iov[1].iov_len = unc_path_len;
757
758 inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
759
760 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
761 rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
762
763 if (rc != 0) {
764 if (tcon) {
765 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
766 tcon->need_reconnect = true;
767 }
768 goto tcon_error_exit;
769 }
770
771 if (tcon == NULL) {
772 ses->ipc_tid = rsp->hdr.TreeId;
773 goto tcon_exit;
774 }
775
776 if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
777 cifs_dbg(FYI, "connection to disk share\n");
778 else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
779 tcon->ipc = true;
780 cifs_dbg(FYI, "connection to pipe share\n");
781 } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
782 tcon->print = true;
783 cifs_dbg(FYI, "connection to printer\n");
784 } else {
785 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
786 rc = -EOPNOTSUPP;
787 goto tcon_error_exit;
788 }
789
790 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
791 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
792 tcon->tidStatus = CifsGood;
793 tcon->need_reconnect = false;
794 tcon->tid = rsp->hdr.TreeId;
795 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
796
797 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
798 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
799 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
800
801 tcon_exit:
802 free_rsp_buf(resp_buftype, rsp);
803 kfree(unc_path);
804 return rc;
805
806 tcon_error_exit:
807 if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
808 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
809 tcon->bad_network_name = true;
810 }
811 goto tcon_exit;
812 }
813
814 int
SMB2_tdis(const unsigned int xid,struct cifs_tcon * tcon)815 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
816 {
817 struct smb2_tree_disconnect_req *req; /* response is trivial */
818 int rc = 0;
819 struct TCP_Server_Info *server;
820 struct cifs_ses *ses = tcon->ses;
821
822 cifs_dbg(FYI, "Tree Disconnect\n");
823
824 if (ses && (ses->server))
825 server = ses->server;
826 else
827 return -EIO;
828
829 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
830 return 0;
831
832 rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
833 if (rc)
834 return rc;
835
836 rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
837 if (rc)
838 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
839
840 return rc;
841 }
842
843 static struct create_lease *
create_lease_buf(u8 * lease_key,u8 oplock)844 create_lease_buf(u8 *lease_key, u8 oplock)
845 {
846 struct create_lease *buf;
847
848 buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
849 if (!buf)
850 return NULL;
851
852 buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
853 buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
854 if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
855 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
856 SMB2_LEASE_READ_CACHING;
857 else if (oplock == SMB2_OPLOCK_LEVEL_II)
858 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
859 else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
860 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
861 SMB2_LEASE_READ_CACHING |
862 SMB2_LEASE_WRITE_CACHING;
863
864 buf->ccontext.DataOffset = cpu_to_le16(offsetof
865 (struct create_lease, lcontext));
866 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
867 buf->ccontext.NameOffset = cpu_to_le16(offsetof
868 (struct create_lease, Name));
869 buf->ccontext.NameLength = cpu_to_le16(4);
870 buf->Name[0] = 'R';
871 buf->Name[1] = 'q';
872 buf->Name[2] = 'L';
873 buf->Name[3] = 's';
874 return buf;
875 }
876
877 static __u8
parse_lease_state(struct smb2_create_rsp * rsp)878 parse_lease_state(struct smb2_create_rsp *rsp)
879 {
880 char *data_offset;
881 struct create_lease *lc;
882 bool found = false;
883
884 data_offset = (char *)rsp;
885 data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
886 lc = (struct create_lease *)data_offset;
887 do {
888 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
889 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
890 strncmp(name, "RqLs", 4)) {
891 lc = (struct create_lease *)((char *)lc
892 + le32_to_cpu(lc->ccontext.Next));
893 continue;
894 }
895 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
896 return SMB2_OPLOCK_LEVEL_NOCHANGE;
897 found = true;
898 break;
899 } while (le32_to_cpu(lc->ccontext.Next) != 0);
900
901 if (!found)
902 return 0;
903
904 return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
905 }
906
907 int
SMB2_open(const unsigned int xid,struct cifs_tcon * tcon,__le16 * path,u64 * persistent_fid,u64 * volatile_fid,__u32 desired_access,__u32 create_disposition,__u32 file_attributes,__u32 create_options,__u8 * oplock,struct smb2_file_all_info * buf)908 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
909 u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
910 __u32 create_disposition, __u32 file_attributes, __u32 create_options,
911 __u8 *oplock, struct smb2_file_all_info *buf)
912 {
913 struct smb2_create_req *req;
914 struct smb2_create_rsp *rsp;
915 struct TCP_Server_Info *server;
916 struct cifs_ses *ses = tcon->ses;
917 struct kvec iov[3];
918 int resp_buftype;
919 int uni_path_len;
920 __le16 *copy_path = NULL;
921 int copy_size;
922 int rc = 0;
923 int num_iovecs = 2;
924
925 cifs_dbg(FYI, "create/open\n");
926
927 if (ses && (ses->server))
928 server = ses->server;
929 else
930 return -EIO;
931
932 rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
933 if (rc)
934 return rc;
935
936 req->ImpersonationLevel = IL_IMPERSONATION;
937 req->DesiredAccess = cpu_to_le32(desired_access);
938 /* File attributes ignored on open (used in create though) */
939 req->FileAttributes = cpu_to_le32(file_attributes);
940 req->ShareAccess = FILE_SHARE_ALL_LE;
941 req->CreateDisposition = cpu_to_le32(create_disposition);
942 req->CreateOptions = cpu_to_le32(create_options);
943 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
944 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
945 - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
946
947 iov[0].iov_base = (char *)req;
948 /* 4 for rfc1002 length field */
949 iov[0].iov_len = get_rfc1002_length(req) + 4;
950
951 /* MUST set path len (NameLength) to 0 opening root of share */
952 if (uni_path_len >= 4) {
953 req->NameLength = cpu_to_le16(uni_path_len - 2);
954 /* -1 since last byte is buf[0] which is sent below (path) */
955 iov[0].iov_len--;
956 if (uni_path_len % 8 != 0) {
957 copy_size = uni_path_len / 8 * 8;
958 if (copy_size < uni_path_len)
959 copy_size += 8;
960
961 copy_path = kzalloc(copy_size, GFP_KERNEL);
962 if (!copy_path)
963 return -ENOMEM;
964 memcpy((char *)copy_path, (const char *)path,
965 uni_path_len);
966 uni_path_len = copy_size;
967 path = copy_path;
968 }
969
970 iov[1].iov_len = uni_path_len;
971 iov[1].iov_base = path;
972 /*
973 * -1 since last byte is buf[0] which was counted in
974 * smb2_buf_len.
975 */
976 inc_rfc1001_len(req, uni_path_len - 1);
977 } else {
978 iov[0].iov_len += 7;
979 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
980 req->hdr.smb2_buf_length) + 8 - 1);
981 num_iovecs = 1;
982 req->NameLength = 0;
983 }
984
985 if (!server->oplocks)
986 *oplock = SMB2_OPLOCK_LEVEL_NONE;
987
988 if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
989 *oplock == SMB2_OPLOCK_LEVEL_NONE)
990 req->RequestedOplockLevel = *oplock;
991 else {
992 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
993 if (iov[num_iovecs].iov_base == NULL) {
994 cifs_small_buf_release(req);
995 kfree(copy_path);
996 return -ENOMEM;
997 }
998 iov[num_iovecs].iov_len = sizeof(struct create_lease);
999 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1000 req->CreateContextsOffset = cpu_to_le32(
1001 sizeof(struct smb2_create_req) - 4 - 8 +
1002 iov[num_iovecs-1].iov_len);
1003 req->CreateContextsLength = cpu_to_le32(
1004 sizeof(struct create_lease));
1005 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1006 num_iovecs++;
1007 }
1008
1009 rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1010 rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1011
1012 if (rc != 0) {
1013 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1014 goto creat_exit;
1015 }
1016
1017 *persistent_fid = rsp->PersistentFileId;
1018 *volatile_fid = rsp->VolatileFileId;
1019
1020 if (buf) {
1021 memcpy(buf, &rsp->CreationTime, 32);
1022 buf->AllocationSize = rsp->AllocationSize;
1023 buf->EndOfFile = rsp->EndofFile;
1024 buf->Attributes = rsp->FileAttributes;
1025 buf->NumberOfLinks = cpu_to_le32(1);
1026 buf->DeletePending = 0;
1027 }
1028
1029 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1030 *oplock = parse_lease_state(rsp);
1031 else
1032 *oplock = rsp->OplockLevel;
1033 creat_exit:
1034 kfree(copy_path);
1035 free_rsp_buf(resp_buftype, rsp);
1036 return rc;
1037 }
1038
1039 int
SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)1040 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1041 u64 persistent_fid, u64 volatile_fid)
1042 {
1043 struct smb2_close_req *req;
1044 struct smb2_close_rsp *rsp;
1045 struct TCP_Server_Info *server;
1046 struct cifs_ses *ses = tcon->ses;
1047 struct kvec iov[1];
1048 int resp_buftype;
1049 int rc = 0;
1050
1051 cifs_dbg(FYI, "Close\n");
1052
1053 if (ses && (ses->server))
1054 server = ses->server;
1055 else
1056 return -EIO;
1057
1058 rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1059 if (rc)
1060 return rc;
1061
1062 req->PersistentFileId = persistent_fid;
1063 req->VolatileFileId = volatile_fid;
1064
1065 iov[0].iov_base = (char *)req;
1066 /* 4 for rfc1002 length field */
1067 iov[0].iov_len = get_rfc1002_length(req) + 4;
1068
1069 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1070 rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1071
1072 if (rc != 0) {
1073 if (tcon)
1074 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1075 goto close_exit;
1076 }
1077
1078 /* BB FIXME - decode close response, update inode for caching */
1079
1080 close_exit:
1081 free_rsp_buf(resp_buftype, rsp);
1082 return rc;
1083 }
1084
1085 static int
validate_buf(unsigned int offset,unsigned int buffer_length,struct smb2_hdr * hdr,unsigned int min_buf_size)1086 validate_buf(unsigned int offset, unsigned int buffer_length,
1087 struct smb2_hdr *hdr, unsigned int min_buf_size)
1088
1089 {
1090 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1091 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1092 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1093 char *end_of_buf = begin_of_buf + buffer_length;
1094
1095
1096 if (buffer_length < min_buf_size) {
1097 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1098 buffer_length, min_buf_size);
1099 return -EINVAL;
1100 }
1101
1102 /* check if beyond RFC1001 maximum length */
1103 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1104 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1105 buffer_length, smb_len);
1106 return -EINVAL;
1107 }
1108
1109 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1110 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1111 return -EINVAL;
1112 }
1113
1114 return 0;
1115 }
1116
1117 /*
1118 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1119 * Caller must free buffer.
1120 */
1121 static int
validate_and_copy_buf(unsigned int offset,unsigned int buffer_length,struct smb2_hdr * hdr,unsigned int minbufsize,char * data)1122 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1123 struct smb2_hdr *hdr, unsigned int minbufsize,
1124 char *data)
1125
1126 {
1127 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1128 int rc;
1129
1130 if (!data)
1131 return -EINVAL;
1132
1133 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1134 if (rc)
1135 return rc;
1136
1137 memcpy(data, begin_of_buf, buffer_length);
1138
1139 return 0;
1140 }
1141
1142 static int
query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u8 info_class,size_t output_len,size_t min_len,void * data)1143 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1144 u64 persistent_fid, u64 volatile_fid, u8 info_class,
1145 size_t output_len, size_t min_len, void *data)
1146 {
1147 struct smb2_query_info_req *req;
1148 struct smb2_query_info_rsp *rsp = NULL;
1149 struct kvec iov[2];
1150 int rc = 0;
1151 int resp_buftype;
1152 struct TCP_Server_Info *server;
1153 struct cifs_ses *ses = tcon->ses;
1154
1155 cifs_dbg(FYI, "Query Info\n");
1156
1157 if (ses && (ses->server))
1158 server = ses->server;
1159 else
1160 return -EIO;
1161
1162 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1163 if (rc)
1164 return rc;
1165
1166 req->InfoType = SMB2_O_INFO_FILE;
1167 req->FileInfoClass = info_class;
1168 req->PersistentFileId = persistent_fid;
1169 req->VolatileFileId = volatile_fid;
1170 /* 4 for rfc1002 length field and 1 for Buffer */
1171 req->InputBufferOffset =
1172 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1173 req->OutputBufferLength = cpu_to_le32(output_len);
1174
1175 iov[0].iov_base = (char *)req;
1176 /* 4 for rfc1002 length field */
1177 iov[0].iov_len = get_rfc1002_length(req) + 4;
1178
1179 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1180 rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1181
1182 if (rc) {
1183 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1184 goto qinf_exit;
1185 }
1186
1187 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1188 le32_to_cpu(rsp->OutputBufferLength),
1189 &rsp->hdr, min_len, data);
1190
1191 qinf_exit:
1192 free_rsp_buf(resp_buftype, rsp);
1193 return rc;
1194 }
1195
1196 int
SMB2_query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_all_info * data)1197 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1198 u64 persistent_fid, u64 volatile_fid,
1199 struct smb2_file_all_info *data)
1200 {
1201 return query_info(xid, tcon, persistent_fid, volatile_fid,
1202 FILE_ALL_INFORMATION,
1203 sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1204 sizeof(struct smb2_file_all_info), data);
1205 }
1206
1207 int
SMB2_get_srv_num(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le64 * uniqueid)1208 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1209 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1210 {
1211 return query_info(xid, tcon, persistent_fid, volatile_fid,
1212 FILE_INTERNAL_INFORMATION,
1213 sizeof(struct smb2_file_internal_info),
1214 sizeof(struct smb2_file_internal_info), uniqueid);
1215 }
1216
1217 /*
1218 * This is a no-op for now. We're not really interested in the reply, but
1219 * rather in the fact that the server sent one and that server->lstrp
1220 * gets updated.
1221 *
1222 * FIXME: maybe we should consider checking that the reply matches request?
1223 */
1224 static void
smb2_echo_callback(struct mid_q_entry * mid)1225 smb2_echo_callback(struct mid_q_entry *mid)
1226 {
1227 struct TCP_Server_Info *server = mid->callback_data;
1228 struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1229 unsigned int credits_received = 1;
1230
1231 if (mid->mid_state == MID_RESPONSE_RECEIVED)
1232 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1233
1234 DeleteMidQEntry(mid);
1235 add_credits(server, credits_received, CIFS_ECHO_OP);
1236 }
1237
1238 int
SMB2_echo(struct TCP_Server_Info * server)1239 SMB2_echo(struct TCP_Server_Info *server)
1240 {
1241 struct smb2_echo_req *req;
1242 int rc = 0;
1243 struct kvec iov;
1244 struct smb_rqst rqst = { .rq_iov = &iov,
1245 .rq_nvec = 1 };
1246
1247 cifs_dbg(FYI, "In echo request\n");
1248
1249 rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1250 if (rc)
1251 return rc;
1252
1253 req->hdr.CreditRequest = cpu_to_le16(1);
1254
1255 iov.iov_base = (char *)req;
1256 /* 4 for rfc1002 length field */
1257 iov.iov_len = get_rfc1002_length(req) + 4;
1258
1259 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1260 CIFS_ECHO_OP);
1261 if (rc)
1262 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1263
1264 cifs_small_buf_release(req);
1265 return rc;
1266 }
1267
1268 int
SMB2_flush(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)1269 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1270 u64 volatile_fid)
1271 {
1272 struct smb2_flush_req *req;
1273 struct TCP_Server_Info *server;
1274 struct cifs_ses *ses = tcon->ses;
1275 struct kvec iov[1];
1276 int resp_buftype;
1277 int rc = 0;
1278
1279 cifs_dbg(FYI, "Flush\n");
1280
1281 if (ses && (ses->server))
1282 server = ses->server;
1283 else
1284 return -EIO;
1285
1286 rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1287 if (rc)
1288 return rc;
1289
1290 req->PersistentFileId = persistent_fid;
1291 req->VolatileFileId = volatile_fid;
1292
1293 iov[0].iov_base = (char *)req;
1294 /* 4 for rfc1002 length field */
1295 iov[0].iov_len = get_rfc1002_length(req) + 4;
1296
1297 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1298
1299 if ((rc != 0) && tcon)
1300 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1301
1302 free_rsp_buf(resp_buftype, iov[0].iov_base);
1303 return rc;
1304 }
1305
1306 /*
1307 * To form a chain of read requests, any read requests after the first should
1308 * have the end_of_chain boolean set to true.
1309 */
1310 static int
smb2_new_read_req(struct kvec * iov,struct cifs_io_parms * io_parms,unsigned int remaining_bytes,int request_type)1311 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1312 unsigned int remaining_bytes, int request_type)
1313 {
1314 int rc = -EACCES;
1315 struct smb2_read_req *req = NULL;
1316
1317 rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1318 if (rc)
1319 return rc;
1320 if (io_parms->tcon->ses->server == NULL)
1321 return -ECONNABORTED;
1322
1323 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1324
1325 req->PersistentFileId = io_parms->persistent_fid;
1326 req->VolatileFileId = io_parms->volatile_fid;
1327 req->ReadChannelInfoOffset = 0; /* reserved */
1328 req->ReadChannelInfoLength = 0; /* reserved */
1329 req->Channel = 0; /* reserved */
1330 req->MinimumCount = 0;
1331 req->Length = cpu_to_le32(io_parms->length);
1332 req->Offset = cpu_to_le64(io_parms->offset);
1333
1334 if (request_type & CHAINED_REQUEST) {
1335 if (!(request_type & END_OF_CHAIN)) {
1336 /* 4 for rfc1002 length field */
1337 req->hdr.NextCommand =
1338 cpu_to_le32(get_rfc1002_length(req) + 4);
1339 } else /* END_OF_CHAIN */
1340 req->hdr.NextCommand = 0;
1341 if (request_type & RELATED_REQUEST) {
1342 req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1343 /*
1344 * Related requests use info from previous read request
1345 * in chain.
1346 */
1347 req->hdr.SessionId = 0xFFFFFFFF;
1348 req->hdr.TreeId = 0xFFFFFFFF;
1349 req->PersistentFileId = 0xFFFFFFFF;
1350 req->VolatileFileId = 0xFFFFFFFF;
1351 }
1352 }
1353 if (remaining_bytes > io_parms->length)
1354 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1355 else
1356 req->RemainingBytes = 0;
1357
1358 iov[0].iov_base = (char *)req;
1359 /* 4 for rfc1002 length field */
1360 iov[0].iov_len = get_rfc1002_length(req) + 4;
1361 return rc;
1362 }
1363
1364 static void
smb2_readv_callback(struct mid_q_entry * mid)1365 smb2_readv_callback(struct mid_q_entry *mid)
1366 {
1367 struct cifs_readdata *rdata = mid->callback_data;
1368 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1369 struct TCP_Server_Info *server = tcon->ses->server;
1370 struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1371 unsigned int credits_received = 1;
1372 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1373 .rq_nvec = 1,
1374 .rq_pages = rdata->pages,
1375 .rq_npages = rdata->nr_pages,
1376 .rq_pagesz = rdata->pagesz,
1377 .rq_tailsz = rdata->tailsz };
1378
1379 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1380 __func__, mid->mid, mid->mid_state, rdata->result,
1381 rdata->bytes);
1382
1383 switch (mid->mid_state) {
1384 case MID_RESPONSE_RECEIVED:
1385 credits_received = le16_to_cpu(buf->CreditRequest);
1386 /* result already set, check signature */
1387 if (server->sec_mode &
1388 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1389 int rc;
1390
1391 rc = smb2_verify_signature(&rqst, server);
1392 if (rc)
1393 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1394 rc);
1395 }
1396 /* FIXME: should this be counted toward the initiating task? */
1397 task_io_account_read(rdata->bytes);
1398 cifs_stats_bytes_read(tcon, rdata->bytes);
1399 break;
1400 case MID_REQUEST_SUBMITTED:
1401 case MID_RETRY_NEEDED:
1402 rdata->result = -EAGAIN;
1403 break;
1404 default:
1405 if (rdata->result != -ENODATA)
1406 rdata->result = -EIO;
1407 }
1408
1409 if (rdata->result)
1410 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1411
1412 queue_work(cifsiod_wq, &rdata->work);
1413 DeleteMidQEntry(mid);
1414 add_credits(server, credits_received, 0);
1415 }
1416
1417 /* smb2_async_readv - send an async write, and set up mid to handle result */
1418 int
smb2_async_readv(struct cifs_readdata * rdata)1419 smb2_async_readv(struct cifs_readdata *rdata)
1420 {
1421 int rc;
1422 struct smb2_hdr *buf;
1423 struct cifs_io_parms io_parms;
1424 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1425 .rq_nvec = 1 };
1426
1427 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1428 __func__, rdata->offset, rdata->bytes);
1429
1430 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1431 io_parms.offset = rdata->offset;
1432 io_parms.length = rdata->bytes;
1433 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1434 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1435 io_parms.pid = rdata->pid;
1436 rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1437 if (rc)
1438 return rc;
1439
1440 buf = (struct smb2_hdr *)rdata->iov.iov_base;
1441 /* 4 for rfc1002 length field */
1442 rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1443
1444 kref_get(&rdata->refcount);
1445 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1446 cifs_readv_receive, smb2_readv_callback,
1447 rdata, 0);
1448 if (rc) {
1449 kref_put(&rdata->refcount, cifs_readdata_release);
1450 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1451 }
1452
1453 cifs_small_buf_release(buf);
1454 return rc;
1455 }
1456
1457 int
SMB2_read(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,char ** buf,int * buf_type)1458 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1459 unsigned int *nbytes, char **buf, int *buf_type)
1460 {
1461 int resp_buftype, rc = -EACCES;
1462 struct smb2_read_rsp *rsp = NULL;
1463 struct kvec iov[1];
1464
1465 *nbytes = 0;
1466 rc = smb2_new_read_req(iov, io_parms, 0, 0);
1467 if (rc)
1468 return rc;
1469
1470 rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1471 &resp_buftype, CIFS_LOG_ERROR);
1472
1473 rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1474
1475 if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1476 free_rsp_buf(resp_buftype, iov[0].iov_base);
1477 return 0;
1478 }
1479
1480 if (rc) {
1481 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1482 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1483 } else {
1484 *nbytes = le32_to_cpu(rsp->DataLength);
1485 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1486 (*nbytes > io_parms->length)) {
1487 cifs_dbg(FYI, "bad length %d for count %d\n",
1488 *nbytes, io_parms->length);
1489 rc = -EIO;
1490 *nbytes = 0;
1491 }
1492 }
1493
1494 if (*buf) {
1495 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1496 *nbytes);
1497 free_rsp_buf(resp_buftype, iov[0].iov_base);
1498 } else if (resp_buftype != CIFS_NO_BUFFER) {
1499 *buf = iov[0].iov_base;
1500 if (resp_buftype == CIFS_SMALL_BUFFER)
1501 *buf_type = CIFS_SMALL_BUFFER;
1502 else if (resp_buftype == CIFS_LARGE_BUFFER)
1503 *buf_type = CIFS_LARGE_BUFFER;
1504 }
1505 return rc;
1506 }
1507
1508 /*
1509 * Check the mid_state and signature on received buffer (if any), and queue the
1510 * workqueue completion task.
1511 */
1512 static void
smb2_writev_callback(struct mid_q_entry * mid)1513 smb2_writev_callback(struct mid_q_entry *mid)
1514 {
1515 struct cifs_writedata *wdata = mid->callback_data;
1516 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1517 unsigned int written;
1518 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1519 unsigned int credits_received = 1;
1520
1521 switch (mid->mid_state) {
1522 case MID_RESPONSE_RECEIVED:
1523 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1524 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1525 if (wdata->result != 0)
1526 break;
1527
1528 written = le32_to_cpu(rsp->DataLength);
1529 /*
1530 * Mask off high 16 bits when bytes written as returned
1531 * by the server is greater than bytes requested by the
1532 * client. OS/2 servers are known to set incorrect
1533 * CountHigh values.
1534 */
1535 if (written > wdata->bytes)
1536 written &= 0xFFFF;
1537
1538 if (written < wdata->bytes)
1539 wdata->result = -ENOSPC;
1540 else
1541 wdata->bytes = written;
1542 break;
1543 case MID_REQUEST_SUBMITTED:
1544 case MID_RETRY_NEEDED:
1545 wdata->result = -EAGAIN;
1546 break;
1547 default:
1548 wdata->result = -EIO;
1549 break;
1550 }
1551
1552 if (wdata->result)
1553 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1554
1555 queue_work(cifsiod_wq, &wdata->work);
1556 DeleteMidQEntry(mid);
1557 add_credits(tcon->ses->server, credits_received, 0);
1558 }
1559
1560 /* smb2_async_writev - send an async write, and set up mid to handle result */
1561 int
smb2_async_writev(struct cifs_writedata * wdata)1562 smb2_async_writev(struct cifs_writedata *wdata)
1563 {
1564 int rc = -EACCES;
1565 struct smb2_write_req *req = NULL;
1566 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1567 struct kvec iov;
1568 struct smb_rqst rqst;
1569
1570 rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1571 if (rc)
1572 goto async_writev_out;
1573
1574 req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1575
1576 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1577 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1578 req->WriteChannelInfoOffset = 0;
1579 req->WriteChannelInfoLength = 0;
1580 req->Channel = 0;
1581 req->Offset = cpu_to_le64(wdata->offset);
1582 /* 4 for rfc1002 length field */
1583 req->DataOffset = cpu_to_le16(
1584 offsetof(struct smb2_write_req, Buffer) - 4);
1585 req->RemainingBytes = 0;
1586
1587 /* 4 for rfc1002 length field and 1 for Buffer */
1588 iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1589 iov.iov_base = req;
1590
1591 rqst.rq_iov = &iov;
1592 rqst.rq_nvec = 1;
1593 rqst.rq_pages = wdata->pages;
1594 rqst.rq_npages = wdata->nr_pages;
1595 rqst.rq_pagesz = wdata->pagesz;
1596 rqst.rq_tailsz = wdata->tailsz;
1597
1598 cifs_dbg(FYI, "async write at %llu %u bytes\n",
1599 wdata->offset, wdata->bytes);
1600
1601 req->Length = cpu_to_le32(wdata->bytes);
1602
1603 inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1604
1605 kref_get(&wdata->refcount);
1606 rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1607 smb2_writev_callback, wdata, 0);
1608
1609 if (rc) {
1610 kref_put(&wdata->refcount, cifs_writedata_release);
1611 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1612 }
1613
1614 async_writev_out:
1615 cifs_small_buf_release(req);
1616 return rc;
1617 }
1618
1619 /*
1620 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1621 * The length field from io_parms must be at least 1 and indicates a number of
1622 * elements with data to write that begins with position 1 in iov array. All
1623 * data length is specified by count.
1624 */
1625 int
SMB2_write(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,struct kvec * iov,int n_vec)1626 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1627 unsigned int *nbytes, struct kvec *iov, int n_vec)
1628 {
1629 int rc = 0;
1630 struct smb2_write_req *req = NULL;
1631 struct smb2_write_rsp *rsp = NULL;
1632 int resp_buftype;
1633 *nbytes = 0;
1634
1635 if (n_vec < 1)
1636 return rc;
1637
1638 rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1639 if (rc)
1640 return rc;
1641
1642 if (io_parms->tcon->ses->server == NULL)
1643 return -ECONNABORTED;
1644
1645 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1646
1647 req->PersistentFileId = io_parms->persistent_fid;
1648 req->VolatileFileId = io_parms->volatile_fid;
1649 req->WriteChannelInfoOffset = 0;
1650 req->WriteChannelInfoLength = 0;
1651 req->Channel = 0;
1652 req->Length = cpu_to_le32(io_parms->length);
1653 req->Offset = cpu_to_le64(io_parms->offset);
1654 /* 4 for rfc1002 length field */
1655 req->DataOffset = cpu_to_le16(
1656 offsetof(struct smb2_write_req, Buffer) - 4);
1657 req->RemainingBytes = 0;
1658
1659 iov[0].iov_base = (char *)req;
1660 /* 4 for rfc1002 length field and 1 for Buffer */
1661 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1662
1663 /* length of entire message including data to be written */
1664 inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1665
1666 rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1667 &resp_buftype, 0);
1668 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1669
1670 if (rc) {
1671 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1672 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1673 } else
1674 *nbytes = le32_to_cpu(rsp->DataLength);
1675
1676 free_rsp_buf(resp_buftype, rsp);
1677 return rc;
1678 }
1679
1680 static unsigned int
num_entries(char * bufstart,char * end_of_buf,char ** lastentry,size_t size)1681 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1682 {
1683 int len;
1684 unsigned int entrycount = 0;
1685 unsigned int next_offset = 0;
1686 FILE_DIRECTORY_INFO *entryptr;
1687
1688 if (bufstart == NULL)
1689 return 0;
1690
1691 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1692
1693 while (1) {
1694 entryptr = (FILE_DIRECTORY_INFO *)
1695 ((char *)entryptr + next_offset);
1696
1697 if ((char *)entryptr + size > end_of_buf) {
1698 cifs_dbg(VFS, "malformed search entry would overflow\n");
1699 break;
1700 }
1701
1702 len = le32_to_cpu(entryptr->FileNameLength);
1703 if ((char *)entryptr + len + size > end_of_buf) {
1704 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1705 end_of_buf);
1706 break;
1707 }
1708
1709 *lastentry = (char *)entryptr;
1710 entrycount++;
1711
1712 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1713 if (!next_offset)
1714 break;
1715 }
1716
1717 return entrycount;
1718 }
1719
1720 /*
1721 * Readdir/FindFirst
1722 */
1723 int
SMB2_query_directory(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int index,struct cifs_search_info * srch_inf)1724 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1725 u64 persistent_fid, u64 volatile_fid, int index,
1726 struct cifs_search_info *srch_inf)
1727 {
1728 struct smb2_query_directory_req *req;
1729 struct smb2_query_directory_rsp *rsp = NULL;
1730 struct kvec iov[2];
1731 int rc = 0;
1732 int len;
1733 int resp_buftype;
1734 unsigned char *bufptr;
1735 struct TCP_Server_Info *server;
1736 struct cifs_ses *ses = tcon->ses;
1737 __le16 asteriks = cpu_to_le16('*');
1738 char *end_of_smb;
1739 unsigned int output_size = CIFSMaxBufSize;
1740 size_t info_buf_size;
1741
1742 if (ses && (ses->server))
1743 server = ses->server;
1744 else
1745 return -EIO;
1746
1747 rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1748 if (rc)
1749 return rc;
1750
1751 switch (srch_inf->info_level) {
1752 case SMB_FIND_FILE_DIRECTORY_INFO:
1753 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1754 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1755 break;
1756 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1757 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1758 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1759 break;
1760 default:
1761 cifs_dbg(VFS, "info level %u isn't supported\n",
1762 srch_inf->info_level);
1763 rc = -EINVAL;
1764 goto qdir_exit;
1765 }
1766
1767 req->FileIndex = cpu_to_le32(index);
1768 req->PersistentFileId = persistent_fid;
1769 req->VolatileFileId = volatile_fid;
1770
1771 len = 0x2;
1772 bufptr = req->Buffer;
1773 memcpy(bufptr, &asteriks, len);
1774
1775 req->FileNameOffset =
1776 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1777 req->FileNameLength = cpu_to_le16(len);
1778 /*
1779 * BB could be 30 bytes or so longer if we used SMB2 specific
1780 * buffer lengths, but this is safe and close enough.
1781 */
1782 output_size = min_t(unsigned int, output_size, server->maxBuf);
1783 output_size = min_t(unsigned int, output_size, 2 << 15);
1784 req->OutputBufferLength = cpu_to_le32(output_size);
1785
1786 iov[0].iov_base = (char *)req;
1787 /* 4 for RFC1001 length and 1 for Buffer */
1788 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1789
1790 iov[1].iov_base = (char *)(req->Buffer);
1791 iov[1].iov_len = len;
1792
1793 inc_rfc1001_len(req, len - 1 /* Buffer */);
1794
1795 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1796 rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1797
1798 if (rc) {
1799 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1800 goto qdir_exit;
1801 }
1802
1803 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1804 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1805 info_buf_size);
1806 if (rc)
1807 goto qdir_exit;
1808
1809 srch_inf->unicode = true;
1810
1811 if (srch_inf->ntwrk_buf_start) {
1812 if (srch_inf->smallBuf)
1813 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1814 else
1815 cifs_buf_release(srch_inf->ntwrk_buf_start);
1816 }
1817 srch_inf->ntwrk_buf_start = (char *)rsp;
1818 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1819 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1820 /* 4 for rfc1002 length field */
1821 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1822 srch_inf->entries_in_buffer =
1823 num_entries(srch_inf->srch_entries_start, end_of_smb,
1824 &srch_inf->last_entry, info_buf_size);
1825 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1826 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1827 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1828 srch_inf->srch_entries_start, srch_inf->last_entry);
1829 if (resp_buftype == CIFS_LARGE_BUFFER)
1830 srch_inf->smallBuf = false;
1831 else if (resp_buftype == CIFS_SMALL_BUFFER)
1832 srch_inf->smallBuf = true;
1833 else
1834 cifs_dbg(VFS, "illegal search buffer type\n");
1835
1836 if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1837 srch_inf->endOfSearch = 1;
1838 else
1839 srch_inf->endOfSearch = 0;
1840
1841 return rc;
1842
1843 qdir_exit:
1844 free_rsp_buf(resp_buftype, rsp);
1845 return rc;
1846 }
1847
1848 static int
send_set_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,int info_class,unsigned int num,void ** data,unsigned int * size)1849 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1850 u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1851 unsigned int num, void **data, unsigned int *size)
1852 {
1853 struct smb2_set_info_req *req;
1854 struct smb2_set_info_rsp *rsp = NULL;
1855 struct kvec *iov;
1856 int rc = 0;
1857 int resp_buftype;
1858 unsigned int i;
1859 struct TCP_Server_Info *server;
1860 struct cifs_ses *ses = tcon->ses;
1861
1862 if (ses && (ses->server))
1863 server = ses->server;
1864 else
1865 return -EIO;
1866
1867 if (!num)
1868 return -EINVAL;
1869
1870 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1871 if (!iov)
1872 return -ENOMEM;
1873
1874 rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1875 if (rc) {
1876 kfree(iov);
1877 return rc;
1878 }
1879
1880 req->hdr.ProcessId = cpu_to_le32(pid);
1881
1882 req->InfoType = SMB2_O_INFO_FILE;
1883 req->FileInfoClass = info_class;
1884 req->PersistentFileId = persistent_fid;
1885 req->VolatileFileId = volatile_fid;
1886
1887 /* 4 for RFC1001 length and 1 for Buffer */
1888 req->BufferOffset =
1889 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1890 req->BufferLength = cpu_to_le32(*size);
1891
1892 inc_rfc1001_len(req, *size - 1 /* Buffer */);
1893
1894 memcpy(req->Buffer, *data, *size);
1895
1896 iov[0].iov_base = (char *)req;
1897 /* 4 for RFC1001 length */
1898 iov[0].iov_len = get_rfc1002_length(req) + 4;
1899
1900 for (i = 1; i < num; i++) {
1901 inc_rfc1001_len(req, size[i]);
1902 le32_add_cpu(&req->BufferLength, size[i]);
1903 iov[i].iov_base = (char *)data[i];
1904 iov[i].iov_len = size[i];
1905 }
1906
1907 rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1908 rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1909
1910 if (rc != 0) {
1911 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1912 goto out;
1913 }
1914 out:
1915 free_rsp_buf(resp_buftype, rsp);
1916 kfree(iov);
1917 return rc;
1918 }
1919
1920 int
SMB2_rename(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le16 * target_file)1921 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1922 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1923 {
1924 struct smb2_file_rename_info info;
1925 void **data;
1926 unsigned int size[2];
1927 int rc;
1928 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1929
1930 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1931 if (!data)
1932 return -ENOMEM;
1933
1934 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1935 /* 0 = fail if target already exists */
1936 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
1937 info.FileNameLength = cpu_to_le32(len);
1938
1939 data[0] = &info;
1940 size[0] = sizeof(struct smb2_file_rename_info);
1941
1942 data[1] = target_file;
1943 size[1] = len + 2 /* null */;
1944
1945 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1946 current->tgid, FILE_RENAME_INFORMATION, 2, data,
1947 size);
1948 kfree(data);
1949 return rc;
1950 }
1951
1952 int
SMB2_set_hardlink(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le16 * target_file)1953 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1954 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1955 {
1956 struct smb2_file_link_info info;
1957 void **data;
1958 unsigned int size[2];
1959 int rc;
1960 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1961
1962 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1963 if (!data)
1964 return -ENOMEM;
1965
1966 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1967 /* 0 = fail if link already exists */
1968 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
1969 info.FileNameLength = cpu_to_le32(len);
1970
1971 data[0] = &info;
1972 size[0] = sizeof(struct smb2_file_link_info);
1973
1974 data[1] = target_file;
1975 size[1] = len + 2 /* null */;
1976
1977 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1978 current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1979 kfree(data);
1980 return rc;
1981 }
1982
1983 int
SMB2_set_eof(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,__le64 * eof)1984 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1985 u64 volatile_fid, u32 pid, __le64 *eof)
1986 {
1987 struct smb2_file_eof_info info;
1988 void *data;
1989 unsigned int size;
1990
1991 info.EndOfFile = *eof;
1992
1993 data = &info;
1994 size = sizeof(struct smb2_file_eof_info);
1995
1996 return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1997 FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1998 }
1999
2000 int
SMB2_set_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,FILE_BASIC_INFO * buf)2001 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2002 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2003 {
2004 unsigned int size;
2005 size = sizeof(FILE_BASIC_INFO);
2006 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2007 current->tgid, FILE_BASIC_INFORMATION, 1,
2008 (void **)&buf, &size);
2009 }
2010
2011 int
SMB2_oplock_break(const unsigned int xid,struct cifs_tcon * tcon,const u64 persistent_fid,const u64 volatile_fid,__u8 oplock_level)2012 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2013 const u64 persistent_fid, const u64 volatile_fid,
2014 __u8 oplock_level)
2015 {
2016 int rc;
2017 struct smb2_oplock_break *req = NULL;
2018
2019 cifs_dbg(FYI, "SMB2_oplock_break\n");
2020 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2021
2022 if (rc)
2023 return rc;
2024
2025 req->VolatileFid = volatile_fid;
2026 req->PersistentFid = persistent_fid;
2027 req->OplockLevel = oplock_level;
2028 req->hdr.CreditRequest = cpu_to_le16(1);
2029
2030 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2031 /* SMB2 buffer freed by function above */
2032
2033 if (rc) {
2034 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2035 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2036 }
2037
2038 return rc;
2039 }
2040
2041 static void
copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info * pfs_inf,struct kstatfs * kst)2042 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2043 struct kstatfs *kst)
2044 {
2045 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2046 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2047 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2048 kst->f_bfree = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2049 kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2050 return;
2051 }
2052
2053 static int
build_qfs_info_req(struct kvec * iov,struct cifs_tcon * tcon,int level,int outbuf_len,u64 persistent_fid,u64 volatile_fid)2054 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2055 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2056 {
2057 int rc;
2058 struct smb2_query_info_req *req;
2059
2060 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2061
2062 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2063 return -EIO;
2064
2065 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2066 if (rc)
2067 return rc;
2068
2069 req->InfoType = SMB2_O_INFO_FILESYSTEM;
2070 req->FileInfoClass = level;
2071 req->PersistentFileId = persistent_fid;
2072 req->VolatileFileId = volatile_fid;
2073 /* 4 for rfc1002 length field and 1 for pad */
2074 req->InputBufferOffset =
2075 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2076 req->OutputBufferLength = cpu_to_le32(
2077 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2078
2079 iov->iov_base = (char *)req;
2080 /* 4 for rfc1002 length field */
2081 iov->iov_len = get_rfc1002_length(req) + 4;
2082 return 0;
2083 }
2084
2085 int
SMB2_QFS_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)2086 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2087 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2088 {
2089 struct smb2_query_info_rsp *rsp = NULL;
2090 struct kvec iov;
2091 int rc = 0;
2092 int resp_buftype;
2093 struct cifs_ses *ses = tcon->ses;
2094 struct smb2_fs_full_size_info *info = NULL;
2095
2096 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2097 sizeof(struct smb2_fs_full_size_info),
2098 persistent_fid, volatile_fid);
2099 if (rc)
2100 return rc;
2101
2102 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2103 if (rc) {
2104 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2105 goto qinf_exit;
2106 }
2107 rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2108
2109 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2110 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2111 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2112 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2113 sizeof(struct smb2_fs_full_size_info));
2114 if (!rc)
2115 copy_fs_info_to_kstatfs(info, fsdata);
2116
2117 qinf_exit:
2118 free_rsp_buf(resp_buftype, iov.iov_base);
2119 return rc;
2120 }
2121
2122 int
smb2_lockv(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u32 num_lock,struct smb2_lock_element * buf)2123 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2124 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2125 const __u32 num_lock, struct smb2_lock_element *buf)
2126 {
2127 int rc = 0;
2128 struct smb2_lock_req *req = NULL;
2129 struct kvec iov[2];
2130 int resp_buf_type;
2131 unsigned int count;
2132
2133 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2134
2135 rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2136 if (rc)
2137 return rc;
2138
2139 req->hdr.ProcessId = cpu_to_le32(pid);
2140 req->LockCount = cpu_to_le16(num_lock);
2141
2142 req->PersistentFileId = persist_fid;
2143 req->VolatileFileId = volatile_fid;
2144
2145 count = num_lock * sizeof(struct smb2_lock_element);
2146 inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2147
2148 iov[0].iov_base = (char *)req;
2149 /* 4 for rfc1002 length field and count for all locks */
2150 iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2151 iov[1].iov_base = (char *)buf;
2152 iov[1].iov_len = count;
2153
2154 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2155 rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2156 if (rc) {
2157 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2158 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2159 }
2160
2161 return rc;
2162 }
2163
2164 int
SMB2_lock(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u64 length,const __u64 offset,const __u32 lock_flags,const bool wait)2165 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2166 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2167 const __u64 length, const __u64 offset, const __u32 lock_flags,
2168 const bool wait)
2169 {
2170 struct smb2_lock_element lock;
2171
2172 lock.Offset = cpu_to_le64(offset);
2173 lock.Length = cpu_to_le64(length);
2174 lock.Flags = cpu_to_le32(lock_flags);
2175 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2176 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2177
2178 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2179 }
2180
2181 int
SMB2_lease_break(const unsigned int xid,struct cifs_tcon * tcon,__u8 * lease_key,const __le32 lease_state)2182 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2183 __u8 *lease_key, const __le32 lease_state)
2184 {
2185 int rc;
2186 struct smb2_lease_ack *req = NULL;
2187
2188 cifs_dbg(FYI, "SMB2_lease_break\n");
2189 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2190
2191 if (rc)
2192 return rc;
2193
2194 req->hdr.CreditRequest = cpu_to_le16(1);
2195 req->StructureSize = cpu_to_le16(36);
2196 inc_rfc1001_len(req, 12);
2197
2198 memcpy(req->LeaseKey, lease_key, 16);
2199 req->LeaseState = lease_state;
2200
2201 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2202 /* SMB2 buffer freed by function above */
2203
2204 if (rc) {
2205 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2206 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2207 }
2208
2209 return rc;
2210 }
2211