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irqchip: Fix dependencies for archs w/o HAS_IOMEM
[linux/fpc-iii.git] / fs / cifs / smb2pdu.c
blob767555518d40ccd357b6f5540f2758bb8be6e654
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 #include "cifs_spnego.h"
50
51 /*
52 * The following table defines the expected "StructureSize" of SMB2 requests
53 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
54 *
55 * Note that commands are defined in smb2pdu.h in le16 but the array below is
56 * indexed by command in host byte order.
57 */
58 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
59 /* SMB2_NEGOTIATE */ 36,
60 /* SMB2_SESSION_SETUP */ 25,
61 /* SMB2_LOGOFF */ 4,
62 /* SMB2_TREE_CONNECT */ 9,
63 /* SMB2_TREE_DISCONNECT */ 4,
64 /* SMB2_CREATE */ 57,
65 /* SMB2_CLOSE */ 24,
66 /* SMB2_FLUSH */ 24,
67 /* SMB2_READ */ 49,
68 /* SMB2_WRITE */ 49,
69 /* SMB2_LOCK */ 48,
70 /* SMB2_IOCTL */ 57,
71 /* SMB2_CANCEL */ 4,
72 /* SMB2_ECHO */ 4,
73 /* SMB2_QUERY_DIRECTORY */ 33,
74 /* SMB2_CHANGE_NOTIFY */ 32,
75 /* SMB2_QUERY_INFO */ 41,
76 /* SMB2_SET_INFO */ 33,
77 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
78 };
79
80
81 static void
82 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
83 const struct cifs_tcon *tcon)
84 {
85 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
86 char *temp = (char *)hdr;
87 /* lookup word count ie StructureSize from table */
88 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
89
90 /*
91 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
92 * largest operations (Create)
93 */
94 memset(temp, 0, 256);
95
96 /* Note this is only network field converted to big endian */
97 hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
98 - 4 /* RFC 1001 length field itself not counted */);
99
100 hdr->ProtocolId[0] = 0xFE;
101 hdr->ProtocolId[1] = 'S';
102 hdr->ProtocolId[2] = 'M';
103 hdr->ProtocolId[3] = 'B';
104 hdr->StructureSize = cpu_to_le16(64);
105 hdr->Command = smb2_cmd;
106 hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
107 hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
108
109 if (!tcon)
110 goto out;
111
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) && (tcon->ses->server) &&
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 out:
249 /*
250 * Check if handle based operation so we know whether we can continue
251 * or not without returning to caller to reset file handle.
252 */
253 /*
254 * BB Is flush done by server on drop of tcp session? Should we special
255 * case it and skip above?
256 */
257 switch (smb2_command) {
258 case SMB2_FLUSH:
259 case SMB2_READ:
260 case SMB2_WRITE:
261 case SMB2_LOCK:
262 case SMB2_IOCTL:
263 case SMB2_QUERY_DIRECTORY:
264 case SMB2_CHANGE_NOTIFY:
265 case SMB2_QUERY_INFO:
266 case SMB2_SET_INFO:
267 return -EAGAIN;
268 }
269 unload_nls(nls_codepage);
270 return rc;
271 }
272
273 /*
274 * Allocate and return pointer to an SMB request hdr, and set basic
275 * SMB information in the SMB header. If the return code is zero, this
276 * function must have filled in request_buf pointer.
277 */
278 static int
279 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
280 void **request_buf)
281 {
282 int rc = 0;
283
284 rc = smb2_reconnect(smb2_command, tcon);
285 if (rc)
286 return rc;
287
288 /* BB eventually switch this to SMB2 specific small buf size */
289 *request_buf = cifs_small_buf_get();
290 if (*request_buf == NULL) {
291 /* BB should we add a retry in here if not a writepage? */
292 return -ENOMEM;
293 }
294
295 smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
296
297 if (tcon != NULL) {
298 #ifdef CONFIG_CIFS_STATS2
299 uint16_t com_code = le16_to_cpu(smb2_command);
300 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
301 #endif
302 cifs_stats_inc(&tcon->num_smbs_sent);
303 }
304
305 return rc;
306 }
307
308 #ifdef CONFIG_CIFS_SMB311
309 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
310 #define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) - 4 */
311
312
313 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
314 #define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
315
316 static void
317 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
318 {
319 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
320 pneg_ctxt->DataLength = cpu_to_le16(38);
321 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
322 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
323 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
324 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
325 }
326
327 static void
328 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
329 {
330 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
331 pneg_ctxt->DataLength = cpu_to_le16(6);
332 pneg_ctxt->CipherCount = cpu_to_le16(2);
333 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
334 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
335 }
336
337 static void
338 assemble_neg_contexts(struct smb2_negotiate_req *req)
339 {
340
341 /* +4 is to account for the RFC1001 len field */
342 char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
343
344 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
345 /* Add 2 to size to round to 8 byte boundary */
346 pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
347 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
348 req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
349 req->NegotiateContextCount = cpu_to_le16(2);
350 inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
351 + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
352 }
353 #else
354 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
355 {
356 return;
357 }
358 #endif /* SMB311 */
359
360
361 /*
362 *
363 * SMB2 Worker functions follow:
364 *
365 * The general structure of the worker functions is:
366 * 1) Call smb2_init (assembles SMB2 header)
367 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
368 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
369 * 4) Decode SMB2 command specific fields in the fixed length area
370 * 5) Decode variable length data area (if any for this SMB2 command type)
371 * 6) Call free smb buffer
372 * 7) return
373 *
374 */
375
376 int
377 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
378 {
379 struct smb2_negotiate_req *req;
380 struct smb2_negotiate_rsp *rsp;
381 struct kvec iov[1];
382 int rc = 0;
383 int resp_buftype;
384 struct TCP_Server_Info *server = ses->server;
385 int blob_offset, blob_length;
386 char *security_blob;
387 int flags = CIFS_NEG_OP;
388
389 cifs_dbg(FYI, "Negotiate protocol\n");
390
391 if (!server) {
392 WARN(1, "%s: server is NULL!\n", __func__);
393 return -EIO;
394 }
395
396 rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
397 if (rc)
398 return rc;
399
400 req->hdr.SessionId = 0;
401
402 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
403
404 req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
405 inc_rfc1001_len(req, 2);
406
407 /* only one of SMB2 signing flags may be set in SMB2 request */
408 if (ses->sign)
409 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
410 else if (global_secflags & CIFSSEC_MAY_SIGN)
411 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
412 else
413 req->SecurityMode = 0;
414
415 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
416
417 /* ClientGUID must be zero for SMB2.02 dialect */
418 if (ses->server->vals->protocol_id == SMB20_PROT_ID)
419 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
420 else {
421 memcpy(req->ClientGUID, server->client_guid,
422 SMB2_CLIENT_GUID_SIZE);
423 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
424 assemble_neg_contexts(req);
425 }
426 iov[0].iov_base = (char *)req;
427 /* 4 for rfc1002 length field */
428 iov[0].iov_len = get_rfc1002_length(req) + 4;
429
430 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
431
432 rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
433 /*
434 * No tcon so can't do
435 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
436 */
437 if (rc != 0)
438 goto neg_exit;
439
440 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
441
442 /* BB we may eventually want to match the negotiated vs. requested
443 dialect, even though we are only requesting one at a time */
444 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
445 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
446 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
447 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
448 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
449 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
450 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
451 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
452 #ifdef CONFIG_CIFS_SMB311
453 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
454 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
455 #endif /* SMB311 */
456 else {
457 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
458 le16_to_cpu(rsp->DialectRevision));
459 rc = -EIO;
460 goto neg_exit;
461 }
462 server->dialect = le16_to_cpu(rsp->DialectRevision);
463
464 /* SMB2 only has an extended negflavor */
465 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
466 /* set it to the maximum buffer size value we can send with 1 credit */
467 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
468 SMB2_MAX_BUFFER_SIZE);
469 server->max_read = le32_to_cpu(rsp->MaxReadSize);
470 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
471 /* BB Do we need to validate the SecurityMode? */
472 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
473 server->capabilities = le32_to_cpu(rsp->Capabilities);
474 /* Internal types */
475 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
476
477 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
478 &rsp->hdr);
479 /*
480 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
481 * for us will be
482 * ses->sectype = RawNTLMSSP;
483 * but for time being this is our only auth choice so doesn't matter.
484 * We just found a server which sets blob length to zero expecting raw.
485 */
486 if (blob_length == 0)
487 cifs_dbg(FYI, "missing security blob on negprot\n");
488
489 rc = cifs_enable_signing(server, ses->sign);
490 if (rc)
491 goto neg_exit;
492 if (blob_length) {
493 rc = decode_negTokenInit(security_blob, blob_length, server);
494 if (rc == 1)
495 rc = 0;
496 else if (rc == 0)
497 rc = -EIO;
498 }
499 neg_exit:
500 free_rsp_buf(resp_buftype, rsp);
501 return rc;
502 }
503
504 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
505 {
506 int rc = 0;
507 struct validate_negotiate_info_req vneg_inbuf;
508 struct validate_negotiate_info_rsp *pneg_rsp;
509 u32 rsplen;
510
511 cifs_dbg(FYI, "validate negotiate\n");
512
513 /*
514 * validation ioctl must be signed, so no point sending this if we
515 * can not sign it. We could eventually change this to selectively
516 * sign just this, the first and only signed request on a connection.
517 * This is good enough for now since a user who wants better security
518 * would also enable signing on the mount. Having validation of
519 * negotiate info for signed connections helps reduce attack vectors
520 */
521 if (tcon->ses->server->sign == false)
522 return 0; /* validation requires signing */
523
524 vneg_inbuf.Capabilities =
525 cpu_to_le32(tcon->ses->server->vals->req_capabilities);
526 memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
527 SMB2_CLIENT_GUID_SIZE);
528
529 if (tcon->ses->sign)
530 vneg_inbuf.SecurityMode =
531 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
532 else if (global_secflags & CIFSSEC_MAY_SIGN)
533 vneg_inbuf.SecurityMode =
534 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
535 else
536 vneg_inbuf.SecurityMode = 0;
537
538 vneg_inbuf.DialectCount = cpu_to_le16(1);
539 vneg_inbuf.Dialects[0] =
540 cpu_to_le16(tcon->ses->server->vals->protocol_id);
541
542 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
543 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
544 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
545 (char **)&pneg_rsp, &rsplen);
546
547 if (rc != 0) {
548 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
549 return -EIO;
550 }
551
552 if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
553 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
554 return -EIO;
555 }
556
557 /* check validate negotiate info response matches what we got earlier */
558 if (pneg_rsp->Dialect !=
559 cpu_to_le16(tcon->ses->server->vals->protocol_id))
560 goto vneg_out;
561
562 if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
563 goto vneg_out;
564
565 /* do not validate server guid because not saved at negprot time yet */
566
567 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
568 SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
569 goto vneg_out;
570
571 /* validate negotiate successful */
572 cifs_dbg(FYI, "validate negotiate info successful\n");
573 return 0;
574
575 vneg_out:
576 cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
577 return -EIO;
578 }
579
580 int
581 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
582 const struct nls_table *nls_cp)
583 {
584 struct smb2_sess_setup_req *req;
585 struct smb2_sess_setup_rsp *rsp = NULL;
586 struct kvec iov[2];
587 int rc = 0;
588 int resp_buftype = CIFS_NO_BUFFER;
589 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
590 struct TCP_Server_Info *server = ses->server;
591 u16 blob_length = 0;
592 struct key *spnego_key = NULL;
593 char *security_blob = NULL;
594 char *ntlmssp_blob = NULL;
595 bool use_spnego = false; /* else use raw ntlmssp */
596
597 cifs_dbg(FYI, "Session Setup\n");
598
599 if (!server) {
600 WARN(1, "%s: server is NULL!\n", __func__);
601 return -EIO;
602 }
603
604 /*
605 * If we are here due to reconnect, free per-smb session key
606 * in case signing was required.
607 */
608 kfree(ses->auth_key.response);
609 ses->auth_key.response = NULL;
610
611 /*
612 * If memory allocation is successful, caller of this function
613 * frees it.
614 */
615 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
616 if (!ses->ntlmssp)
617 return -ENOMEM;
618 ses->ntlmssp->sesskey_per_smbsess = true;
619
620 /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
621 if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
622 ses->sectype = RawNTLMSSP;
623
624 ssetup_ntlmssp_authenticate:
625 if (phase == NtLmChallenge)
626 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
627
628 rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
629 if (rc)
630 return rc;
631
632 req->hdr.SessionId = 0; /* First session, not a reauthenticate */
633 req->Flags = 0; /* MBZ */
634 /* to enable echos and oplocks */
635 req->hdr.CreditRequest = cpu_to_le16(3);
636
637 /* only one of SMB2 signing flags may be set in SMB2 request */
638 if (server->sign)
639 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
640 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
641 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
642 else
643 req->SecurityMode = 0;
644
645 req->Capabilities = 0;
646 req->Channel = 0; /* MBZ */
647
648 iov[0].iov_base = (char *)req;
649 /* 4 for rfc1002 length field and 1 for pad */
650 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
651
652 if (ses->sectype == Kerberos) {
653 #ifdef CONFIG_CIFS_UPCALL
654 struct cifs_spnego_msg *msg;
655
656 spnego_key = cifs_get_spnego_key(ses);
657 if (IS_ERR(spnego_key)) {
658 rc = PTR_ERR(spnego_key);
659 spnego_key = NULL;
660 goto ssetup_exit;
661 }
662
663 msg = spnego_key->payload.data[0];
664 /*
665 * check version field to make sure that cifs.upcall is
666 * sending us a response in an expected form
667 */
668 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
669 cifs_dbg(VFS,
670 "bad cifs.upcall version. Expected %d got %d",
671 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
672 rc = -EKEYREJECTED;
673 goto ssetup_exit;
674 }
675 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
676 GFP_KERNEL);
677 if (!ses->auth_key.response) {
678 cifs_dbg(VFS,
679 "Kerberos can't allocate (%u bytes) memory",
680 msg->sesskey_len);
681 rc = -ENOMEM;
682 goto ssetup_exit;
683 }
684 ses->auth_key.len = msg->sesskey_len;
685 blob_length = msg->secblob_len;
686 iov[1].iov_base = msg->data + msg->sesskey_len;
687 iov[1].iov_len = blob_length;
688 #else
689 rc = -EOPNOTSUPP;
690 goto ssetup_exit;
691 #endif /* CONFIG_CIFS_UPCALL */
692 } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
693 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
694 GFP_KERNEL);
695 if (ntlmssp_blob == NULL) {
696 rc = -ENOMEM;
697 goto ssetup_exit;
698 }
699 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
700 if (use_spnego) {
701 /* blob_length = build_spnego_ntlmssp_blob(
702 &security_blob,
703 sizeof(struct _NEGOTIATE_MESSAGE),
704 ntlmssp_blob); */
705 /* BB eventually need to add this */
706 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
707 rc = -EOPNOTSUPP;
708 kfree(ntlmssp_blob);
709 goto ssetup_exit;
710 } else {
711 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
712 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
713 security_blob = ntlmssp_blob;
714 }
715 iov[1].iov_base = security_blob;
716 iov[1].iov_len = blob_length;
717 } else if (phase == NtLmAuthenticate) {
718 req->hdr.SessionId = ses->Suid;
719 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
720 GFP_KERNEL);
721 if (ntlmssp_blob == NULL) {
722 rc = -ENOMEM;
723 goto ssetup_exit;
724 }
725 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
726 nls_cp);
727 if (rc) {
728 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
729 rc);
730 goto ssetup_exit; /* BB double check error handling */
731 }
732 if (use_spnego) {
733 /* blob_length = build_spnego_ntlmssp_blob(
734 &security_blob,
735 blob_length,
736 ntlmssp_blob); */
737 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
738 rc = -EOPNOTSUPP;
739 kfree(ntlmssp_blob);
740 goto ssetup_exit;
741 } else {
742 security_blob = ntlmssp_blob;
743 }
744 iov[1].iov_base = security_blob;
745 iov[1].iov_len = blob_length;
746 } else {
747 cifs_dbg(VFS, "illegal ntlmssp phase\n");
748 rc = -EIO;
749 goto ssetup_exit;
750 }
751
752 /* Testing shows that buffer offset must be at location of Buffer[0] */
753 req->SecurityBufferOffset =
754 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
755 1 /* pad */ - 4 /* rfc1001 len */);
756 req->SecurityBufferLength = cpu_to_le16(blob_length);
757
758 inc_rfc1001_len(req, blob_length - 1 /* pad */);
759
760 /* BB add code to build os and lm fields */
761
762 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
763 CIFS_LOG_ERROR | CIFS_NEG_OP);
764
765 kfree(security_blob);
766 rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
767 ses->Suid = rsp->hdr.SessionId;
768 if (resp_buftype != CIFS_NO_BUFFER &&
769 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
770 if (phase != NtLmNegotiate) {
771 cifs_dbg(VFS, "Unexpected more processing error\n");
772 goto ssetup_exit;
773 }
774 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
775 le16_to_cpu(rsp->SecurityBufferOffset)) {
776 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
777 le16_to_cpu(rsp->SecurityBufferOffset));
778 rc = -EIO;
779 goto ssetup_exit;
780 }
781
782 /* NTLMSSP Negotiate sent now processing challenge (response) */
783 phase = NtLmChallenge; /* process ntlmssp challenge */
784 rc = 0; /* MORE_PROCESSING is not an error here but expected */
785 rc = decode_ntlmssp_challenge(rsp->Buffer,
786 le16_to_cpu(rsp->SecurityBufferLength), ses);
787 }
788
789 /*
790 * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
791 * but at least the raw NTLMSSP case works.
792 */
793 /*
794 * No tcon so can't do
795 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
796 */
797 if (rc != 0)
798 goto ssetup_exit;
799
800 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
801 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
802 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
803 ssetup_exit:
804 free_rsp_buf(resp_buftype, rsp);
805
806 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
807 if ((phase == NtLmChallenge) && (rc == 0))
808 goto ssetup_ntlmssp_authenticate;
809
810 if (!rc) {
811 mutex_lock(&server->srv_mutex);
812 if (server->sign && server->ops->generate_signingkey) {
813 rc = server->ops->generate_signingkey(ses);
814 kfree(ses->auth_key.response);
815 ses->auth_key.response = NULL;
816 if (rc) {
817 cifs_dbg(FYI,
818 "SMB3 session key generation failed\n");
819 mutex_unlock(&server->srv_mutex);
820 goto keygen_exit;
821 }
822 }
823 if (!server->session_estab) {
824 server->sequence_number = 0x2;
825 server->session_estab = true;
826 }
827 mutex_unlock(&server->srv_mutex);
828
829 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
830 spin_lock(&GlobalMid_Lock);
831 ses->status = CifsGood;
832 ses->need_reconnect = false;
833 spin_unlock(&GlobalMid_Lock);
834 }
835
836 keygen_exit:
837 if (!server->sign) {
838 kfree(ses->auth_key.response);
839 ses->auth_key.response = NULL;
840 }
841 if (spnego_key) {
842 key_invalidate(spnego_key);
843 key_put(spnego_key);
844 }
845 kfree(ses->ntlmssp);
846
847 return rc;
848 }
849
850 int
851 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
852 {
853 struct smb2_logoff_req *req; /* response is also trivial struct */
854 int rc = 0;
855 struct TCP_Server_Info *server;
856
857 cifs_dbg(FYI, "disconnect session %p\n", ses);
858
859 if (ses && (ses->server))
860 server = ses->server;
861 else
862 return -EIO;
863
864 /* no need to send SMB logoff if uid already closed due to reconnect */
865 if (ses->need_reconnect)
866 goto smb2_session_already_dead;
867
868 rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
869 if (rc)
870 return rc;
871
872 /* since no tcon, smb2_init can not do this, so do here */
873 req->hdr.SessionId = ses->Suid;
874 if (server->sign)
875 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
876
877 rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
878 /*
879 * No tcon so can't do
880 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
881 */
882
883 smb2_session_already_dead:
884 return rc;
885 }
886
887 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
888 {
889 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
890 }
891
892 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
893
894 /* These are similar values to what Windows uses */
895 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
896 {
897 tcon->max_chunks = 256;
898 tcon->max_bytes_chunk = 1048576;
899 tcon->max_bytes_copy = 16777216;
900 }
901
902 int
903 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
904 struct cifs_tcon *tcon, const struct nls_table *cp)
905 {
906 struct smb2_tree_connect_req *req;
907 struct smb2_tree_connect_rsp *rsp = NULL;
908 struct kvec iov[2];
909 int rc = 0;
910 int resp_buftype;
911 int unc_path_len;
912 struct TCP_Server_Info *server;
913 __le16 *unc_path = NULL;
914
915 cifs_dbg(FYI, "TCON\n");
916
917 if ((ses->server) && tree)
918 server = ses->server;
919 else
920 return -EIO;
921
922 if (tcon && tcon->bad_network_name)
923 return -ENOENT;
924
925 if ((tcon && tcon->seal) &&
926 ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
927 cifs_dbg(VFS, "encryption requested but no server support");
928 return -EOPNOTSUPP;
929 }
930
931 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
932 if (unc_path == NULL)
933 return -ENOMEM;
934
935 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
936 unc_path_len *= 2;
937 if (unc_path_len < 2) {
938 kfree(unc_path);
939 return -EINVAL;
940 }
941
942 rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
943 if (rc) {
944 kfree(unc_path);
945 return rc;
946 }
947
948 if (tcon == NULL) {
949 /* since no tcon, smb2_init can not do this, so do here */
950 req->hdr.SessionId = ses->Suid;
951 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
952 req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
953 }
954
955 iov[0].iov_base = (char *)req;
956 /* 4 for rfc1002 length field and 1 for pad */
957 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
958
959 /* Testing shows that buffer offset must be at location of Buffer[0] */
960 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
961 - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
962 req->PathLength = cpu_to_le16(unc_path_len - 2);
963 iov[1].iov_base = unc_path;
964 iov[1].iov_len = unc_path_len;
965
966 inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
967
968 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
969 rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
970
971 if (rc != 0) {
972 if (tcon) {
973 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
974 tcon->need_reconnect = true;
975 }
976 goto tcon_error_exit;
977 }
978
979 if (tcon == NULL) {
980 ses->ipc_tid = rsp->hdr.TreeId;
981 goto tcon_exit;
982 }
983
984 if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
985 cifs_dbg(FYI, "connection to disk share\n");
986 else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
987 tcon->ipc = true;
988 cifs_dbg(FYI, "connection to pipe share\n");
989 } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
990 tcon->print = true;
991 cifs_dbg(FYI, "connection to printer\n");
992 } else {
993 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
994 rc = -EOPNOTSUPP;
995 goto tcon_error_exit;
996 }
997
998 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
999 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1000 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1001 tcon->tidStatus = CifsGood;
1002 tcon->need_reconnect = false;
1003 tcon->tid = rsp->hdr.TreeId;
1004 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1005
1006 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1007 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1008 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1009 init_copy_chunk_defaults(tcon);
1010 if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1011 cifs_dbg(VFS, "Encrypted shares not supported");
1012 if (tcon->ses->server->ops->validate_negotiate)
1013 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1014 tcon_exit:
1015 free_rsp_buf(resp_buftype, rsp);
1016 kfree(unc_path);
1017 return rc;
1018
1019 tcon_error_exit:
1020 if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1021 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1022 if (tcon)
1023 tcon->bad_network_name = true;
1024 }
1025 goto tcon_exit;
1026 }
1027
1028 int
1029 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1030 {
1031 struct smb2_tree_disconnect_req *req; /* response is trivial */
1032 int rc = 0;
1033 struct TCP_Server_Info *server;
1034 struct cifs_ses *ses = tcon->ses;
1035
1036 cifs_dbg(FYI, "Tree Disconnect\n");
1037
1038 if (ses && (ses->server))
1039 server = ses->server;
1040 else
1041 return -EIO;
1042
1043 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1044 return 0;
1045
1046 rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1047 if (rc)
1048 return rc;
1049
1050 rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1051 if (rc)
1052 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1053
1054 return rc;
1055 }
1056
1057
1058 static struct create_durable *
1059 create_durable_buf(void)
1060 {
1061 struct create_durable *buf;
1062
1063 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1064 if (!buf)
1065 return NULL;
1066
1067 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1068 (struct create_durable, Data));
1069 buf->ccontext.DataLength = cpu_to_le32(16);
1070 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1071 (struct create_durable, Name));
1072 buf->ccontext.NameLength = cpu_to_le16(4);
1073 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1074 buf->Name[0] = 'D';
1075 buf->Name[1] = 'H';
1076 buf->Name[2] = 'n';
1077 buf->Name[3] = 'Q';
1078 return buf;
1079 }
1080
1081 static struct create_durable *
1082 create_reconnect_durable_buf(struct cifs_fid *fid)
1083 {
1084 struct create_durable *buf;
1085
1086 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1087 if (!buf)
1088 return NULL;
1089
1090 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1091 (struct create_durable, Data));
1092 buf->ccontext.DataLength = cpu_to_le32(16);
1093 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1094 (struct create_durable, Name));
1095 buf->ccontext.NameLength = cpu_to_le16(4);
1096 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1097 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1098 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1099 buf->Name[0] = 'D';
1100 buf->Name[1] = 'H';
1101 buf->Name[2] = 'n';
1102 buf->Name[3] = 'C';
1103 return buf;
1104 }
1105
1106 static __u8
1107 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1108 unsigned int *epoch)
1109 {
1110 char *data_offset;
1111 struct create_context *cc;
1112 unsigned int next = 0;
1113 char *name;
1114
1115 data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1116 cc = (struct create_context *)data_offset;
1117 do {
1118 cc = (struct create_context *)((char *)cc + next);
1119 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1120 if (le16_to_cpu(cc->NameLength) != 4 ||
1121 strncmp(name, "RqLs", 4)) {
1122 next = le32_to_cpu(cc->Next);
1123 continue;
1124 }
1125 return server->ops->parse_lease_buf(cc, epoch);
1126 } while (next != 0);
1127
1128 return 0;
1129 }
1130
1131 static int
1132 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1133 unsigned int *num_iovec, __u8 *oplock)
1134 {
1135 struct smb2_create_req *req = iov[0].iov_base;
1136 unsigned int num = *num_iovec;
1137
1138 iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1139 if (iov[num].iov_base == NULL)
1140 return -ENOMEM;
1141 iov[num].iov_len = server->vals->create_lease_size;
1142 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1143 if (!req->CreateContextsOffset)
1144 req->CreateContextsOffset = cpu_to_le32(
1145 sizeof(struct smb2_create_req) - 4 +
1146 iov[num - 1].iov_len);
1147 le32_add_cpu(&req->CreateContextsLength,
1148 server->vals->create_lease_size);
1149 inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1150 *num_iovec = num + 1;
1151 return 0;
1152 }
1153
1154 static struct create_durable_v2 *
1155 create_durable_v2_buf(struct cifs_fid *pfid)
1156 {
1157 struct create_durable_v2 *buf;
1158
1159 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1160 if (!buf)
1161 return NULL;
1162
1163 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1164 (struct create_durable_v2, dcontext));
1165 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1166 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1167 (struct create_durable_v2, Name));
1168 buf->ccontext.NameLength = cpu_to_le16(4);
1169
1170 buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1171 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1172 get_random_bytes(buf->dcontext.CreateGuid, 16);
1173 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1174
1175 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1176 buf->Name[0] = 'D';
1177 buf->Name[1] = 'H';
1178 buf->Name[2] = '2';
1179 buf->Name[3] = 'Q';
1180 return buf;
1181 }
1182
1183 static struct create_durable_handle_reconnect_v2 *
1184 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1185 {
1186 struct create_durable_handle_reconnect_v2 *buf;
1187
1188 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1189 GFP_KERNEL);
1190 if (!buf)
1191 return NULL;
1192
1193 buf->ccontext.DataOffset =
1194 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1195 dcontext));
1196 buf->ccontext.DataLength =
1197 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1198 buf->ccontext.NameOffset =
1199 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1200 Name));
1201 buf->ccontext.NameLength = cpu_to_le16(4);
1202
1203 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1204 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1205 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1206 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1207
1208 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1209 buf->Name[0] = 'D';
1210 buf->Name[1] = 'H';
1211 buf->Name[2] = '2';
1212 buf->Name[3] = 'C';
1213 return buf;
1214 }
1215
1216 static int
1217 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1218 struct cifs_open_parms *oparms)
1219 {
1220 struct smb2_create_req *req = iov[0].iov_base;
1221 unsigned int num = *num_iovec;
1222
1223 iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1224 if (iov[num].iov_base == NULL)
1225 return -ENOMEM;
1226 iov[num].iov_len = sizeof(struct create_durable_v2);
1227 if (!req->CreateContextsOffset)
1228 req->CreateContextsOffset =
1229 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1230 iov[1].iov_len);
1231 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1232 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1233 *num_iovec = num + 1;
1234 return 0;
1235 }
1236
1237 static int
1238 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1239 struct cifs_open_parms *oparms)
1240 {
1241 struct smb2_create_req *req = iov[0].iov_base;
1242 unsigned int num = *num_iovec;
1243
1244 /* indicate that we don't need to relock the file */
1245 oparms->reconnect = false;
1246
1247 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1248 if (iov[num].iov_base == NULL)
1249 return -ENOMEM;
1250 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1251 if (!req->CreateContextsOffset)
1252 req->CreateContextsOffset =
1253 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1254 iov[1].iov_len);
1255 le32_add_cpu(&req->CreateContextsLength,
1256 sizeof(struct create_durable_handle_reconnect_v2));
1257 inc_rfc1001_len(&req->hdr,
1258 sizeof(struct create_durable_handle_reconnect_v2));
1259 *num_iovec = num + 1;
1260 return 0;
1261 }
1262
1263 static int
1264 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1265 struct cifs_open_parms *oparms, bool use_persistent)
1266 {
1267 struct smb2_create_req *req = iov[0].iov_base;
1268 unsigned int num = *num_iovec;
1269
1270 if (use_persistent) {
1271 if (oparms->reconnect)
1272 return add_durable_reconnect_v2_context(iov, num_iovec,
1273 oparms);
1274 else
1275 return add_durable_v2_context(iov, num_iovec, oparms);
1276 }
1277
1278 if (oparms->reconnect) {
1279 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1280 /* indicate that we don't need to relock the file */
1281 oparms->reconnect = false;
1282 } else
1283 iov[num].iov_base = create_durable_buf();
1284 if (iov[num].iov_base == NULL)
1285 return -ENOMEM;
1286 iov[num].iov_len = sizeof(struct create_durable);
1287 if (!req->CreateContextsOffset)
1288 req->CreateContextsOffset =
1289 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1290 iov[1].iov_len);
1291 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1292 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1293 *num_iovec = num + 1;
1294 return 0;
1295 }
1296
1297 int
1298 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1299 __u8 *oplock, struct smb2_file_all_info *buf,
1300 struct smb2_err_rsp **err_buf)
1301 {
1302 struct smb2_create_req *req;
1303 struct smb2_create_rsp *rsp;
1304 struct TCP_Server_Info *server;
1305 struct cifs_tcon *tcon = oparms->tcon;
1306 struct cifs_ses *ses = tcon->ses;
1307 struct kvec iov[4];
1308 int resp_buftype;
1309 int uni_path_len;
1310 __le16 *copy_path = NULL;
1311 int copy_size;
1312 int rc = 0;
1313 unsigned int num_iovecs = 2;
1314 __u32 file_attributes = 0;
1315 char *dhc_buf = NULL, *lc_buf = NULL;
1316
1317 cifs_dbg(FYI, "create/open\n");
1318
1319 if (ses && (ses->server))
1320 server = ses->server;
1321 else
1322 return -EIO;
1323
1324 rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1325 if (rc)
1326 return rc;
1327
1328 if (oparms->create_options & CREATE_OPTION_READONLY)
1329 file_attributes |= ATTR_READONLY;
1330 if (oparms->create_options & CREATE_OPTION_SPECIAL)
1331 file_attributes |= ATTR_SYSTEM;
1332
1333 req->ImpersonationLevel = IL_IMPERSONATION;
1334 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1335 /* File attributes ignored on open (used in create though) */
1336 req->FileAttributes = cpu_to_le32(file_attributes);
1337 req->ShareAccess = FILE_SHARE_ALL_LE;
1338 req->CreateDisposition = cpu_to_le32(oparms->disposition);
1339 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1340 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1341 /* do not count rfc1001 len field */
1342 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1343
1344 iov[0].iov_base = (char *)req;
1345 /* 4 for rfc1002 length field */
1346 iov[0].iov_len = get_rfc1002_length(req) + 4;
1347
1348 /* MUST set path len (NameLength) to 0 opening root of share */
1349 req->NameLength = cpu_to_le16(uni_path_len - 2);
1350 /* -1 since last byte is buf[0] which is sent below (path) */
1351 iov[0].iov_len--;
1352 if (uni_path_len % 8 != 0) {
1353 copy_size = uni_path_len / 8 * 8;
1354 if (copy_size < uni_path_len)
1355 copy_size += 8;
1356
1357 copy_path = kzalloc(copy_size, GFP_KERNEL);
1358 if (!copy_path)
1359 return -ENOMEM;
1360 memcpy((char *)copy_path, (const char *)path,
1361 uni_path_len);
1362 uni_path_len = copy_size;
1363 path = copy_path;
1364 }
1365
1366 iov[1].iov_len = uni_path_len;
1367 iov[1].iov_base = path;
1368 /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1369 inc_rfc1001_len(req, uni_path_len - 1);
1370
1371 if (!server->oplocks)
1372 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1373
1374 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1375 *oplock == SMB2_OPLOCK_LEVEL_NONE)
1376 req->RequestedOplockLevel = *oplock;
1377 else {
1378 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1379 if (rc) {
1380 cifs_small_buf_release(req);
1381 kfree(copy_path);
1382 return rc;
1383 }
1384 lc_buf = iov[num_iovecs-1].iov_base;
1385 }
1386
1387 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1388 /* need to set Next field of lease context if we request it */
1389 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1390 struct create_context *ccontext =
1391 (struct create_context *)iov[num_iovecs-1].iov_base;
1392 ccontext->Next =
1393 cpu_to_le32(server->vals->create_lease_size);
1394 }
1395
1396 rc = add_durable_context(iov, &num_iovecs, oparms,
1397 tcon->use_persistent);
1398 if (rc) {
1399 cifs_small_buf_release(req);
1400 kfree(copy_path);
1401 kfree(lc_buf);
1402 return rc;
1403 }
1404 dhc_buf = iov[num_iovecs-1].iov_base;
1405 }
1406
1407 rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1408 rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1409
1410 if (rc != 0) {
1411 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1412 if (err_buf)
1413 *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1414 GFP_KERNEL);
1415 goto creat_exit;
1416 }
1417
1418 oparms->fid->persistent_fid = rsp->PersistentFileId;
1419 oparms->fid->volatile_fid = rsp->VolatileFileId;
1420
1421 if (buf) {
1422 memcpy(buf, &rsp->CreationTime, 32);
1423 buf->AllocationSize = rsp->AllocationSize;
1424 buf->EndOfFile = rsp->EndofFile;
1425 buf->Attributes = rsp->FileAttributes;
1426 buf->NumberOfLinks = cpu_to_le32(1);
1427 buf->DeletePending = 0;
1428 }
1429
1430 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1431 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1432 else
1433 *oplock = rsp->OplockLevel;
1434 creat_exit:
1435 kfree(copy_path);
1436 kfree(lc_buf);
1437 kfree(dhc_buf);
1438 free_rsp_buf(resp_buftype, rsp);
1439 return rc;
1440 }
1441
1442 /*
1443 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
1444 */
1445 int
1446 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1447 u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1448 u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1449 {
1450 struct smb2_ioctl_req *req;
1451 struct smb2_ioctl_rsp *rsp;
1452 struct TCP_Server_Info *server;
1453 struct cifs_ses *ses;
1454 struct kvec iov[2];
1455 int resp_buftype;
1456 int num_iovecs;
1457 int rc = 0;
1458
1459 cifs_dbg(FYI, "SMB2 IOCTL\n");
1460
1461 if (out_data != NULL)
1462 *out_data = NULL;
1463
1464 /* zero out returned data len, in case of error */
1465 if (plen)
1466 *plen = 0;
1467
1468 if (tcon)
1469 ses = tcon->ses;
1470 else
1471 return -EIO;
1472
1473 if (ses && (ses->server))
1474 server = ses->server;
1475 else
1476 return -EIO;
1477
1478 rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1479 if (rc)
1480 return rc;
1481
1482 req->CtlCode = cpu_to_le32(opcode);
1483 req->PersistentFileId = persistent_fid;
1484 req->VolatileFileId = volatile_fid;
1485
1486 if (indatalen) {
1487 req->InputCount = cpu_to_le32(indatalen);
1488 /* do not set InputOffset if no input data */
1489 req->InputOffset =
1490 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1491 iov[1].iov_base = in_data;
1492 iov[1].iov_len = indatalen;
1493 num_iovecs = 2;
1494 } else
1495 num_iovecs = 1;
1496
1497 req->OutputOffset = 0;
1498 req->OutputCount = 0; /* MBZ */
1499
1500 /*
1501 * Could increase MaxOutputResponse, but that would require more
1502 * than one credit. Windows typically sets this smaller, but for some
1503 * ioctls it may be useful to allow server to send more. No point
1504 * limiting what the server can send as long as fits in one credit
1505 */
1506 req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1507
1508 if (is_fsctl)
1509 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1510 else
1511 req->Flags = 0;
1512
1513 iov[0].iov_base = (char *)req;
1514
1515 /*
1516 * If no input data, the size of ioctl struct in
1517 * protocol spec still includes a 1 byte data buffer,
1518 * but if input data passed to ioctl, we do not
1519 * want to double count this, so we do not send
1520 * the dummy one byte of data in iovec[0] if sending
1521 * input data (in iovec[1]). We also must add 4 bytes
1522 * in first iovec to allow for rfc1002 length field.
1523 */
1524
1525 if (indatalen) {
1526 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1527 inc_rfc1001_len(req, indatalen - 1);
1528 } else
1529 iov[0].iov_len = get_rfc1002_length(req) + 4;
1530
1531
1532 rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1533 rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1534
1535 if ((rc != 0) && (rc != -EINVAL)) {
1536 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1537 goto ioctl_exit;
1538 } else if (rc == -EINVAL) {
1539 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1540 (opcode != FSCTL_SRV_COPYCHUNK)) {
1541 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1542 goto ioctl_exit;
1543 }
1544 }
1545
1546 /* check if caller wants to look at return data or just return rc */
1547 if ((plen == NULL) || (out_data == NULL))
1548 goto ioctl_exit;
1549
1550 *plen = le32_to_cpu(rsp->OutputCount);
1551
1552 /* We check for obvious errors in the output buffer length and offset */
1553 if (*plen == 0)
1554 goto ioctl_exit; /* server returned no data */
1555 else if (*plen > 0xFF00) {
1556 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1557 *plen = 0;
1558 rc = -EIO;
1559 goto ioctl_exit;
1560 }
1561
1562 if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1563 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1564 le32_to_cpu(rsp->OutputOffset));
1565 *plen = 0;
1566 rc = -EIO;
1567 goto ioctl_exit;
1568 }
1569
1570 *out_data = kmalloc(*plen, GFP_KERNEL);
1571 if (*out_data == NULL) {
1572 rc = -ENOMEM;
1573 goto ioctl_exit;
1574 }
1575
1576 memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1577 *plen);
1578 ioctl_exit:
1579 free_rsp_buf(resp_buftype, rsp);
1580 return rc;
1581 }
1582
1583 /*
1584 * Individual callers to ioctl worker function follow
1585 */
1586
1587 int
1588 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1589 u64 persistent_fid, u64 volatile_fid)
1590 {
1591 int rc;
1592 struct compress_ioctl fsctl_input;
1593 char *ret_data = NULL;
1594
1595 fsctl_input.CompressionState =
1596 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1597
1598 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1599 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1600 (char *)&fsctl_input /* data input */,
1601 2 /* in data len */, &ret_data /* out data */, NULL);
1602
1603 cifs_dbg(FYI, "set compression rc %d\n", rc);
1604
1605 return rc;
1606 }
1607
1608 int
1609 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1610 u64 persistent_fid, u64 volatile_fid)
1611 {
1612 struct smb2_close_req *req;
1613 struct smb2_close_rsp *rsp;
1614 struct TCP_Server_Info *server;
1615 struct cifs_ses *ses = tcon->ses;
1616 struct kvec iov[1];
1617 int resp_buftype;
1618 int rc = 0;
1619
1620 cifs_dbg(FYI, "Close\n");
1621
1622 if (ses && (ses->server))
1623 server = ses->server;
1624 else
1625 return -EIO;
1626
1627 rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1628 if (rc)
1629 return rc;
1630
1631 req->PersistentFileId = persistent_fid;
1632 req->VolatileFileId = volatile_fid;
1633
1634 iov[0].iov_base = (char *)req;
1635 /* 4 for rfc1002 length field */
1636 iov[0].iov_len = get_rfc1002_length(req) + 4;
1637
1638 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1639 rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1640
1641 if (rc != 0) {
1642 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1643 goto close_exit;
1644 }
1645
1646 /* BB FIXME - decode close response, update inode for caching */
1647
1648 close_exit:
1649 free_rsp_buf(resp_buftype, rsp);
1650 return rc;
1651 }
1652
1653 static int
1654 validate_buf(unsigned int offset, unsigned int buffer_length,
1655 struct smb2_hdr *hdr, unsigned int min_buf_size)
1656
1657 {
1658 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1659 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1660 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1661 char *end_of_buf = begin_of_buf + buffer_length;
1662
1663
1664 if (buffer_length < min_buf_size) {
1665 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1666 buffer_length, min_buf_size);
1667 return -EINVAL;
1668 }
1669
1670 /* check if beyond RFC1001 maximum length */
1671 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1672 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1673 buffer_length, smb_len);
1674 return -EINVAL;
1675 }
1676
1677 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1678 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1679 return -EINVAL;
1680 }
1681
1682 return 0;
1683 }
1684
1685 /*
1686 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1687 * Caller must free buffer.
1688 */
1689 static int
1690 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1691 struct smb2_hdr *hdr, unsigned int minbufsize,
1692 char *data)
1693
1694 {
1695 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1696 int rc;
1697
1698 if (!data)
1699 return -EINVAL;
1700
1701 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1702 if (rc)
1703 return rc;
1704
1705 memcpy(data, begin_of_buf, buffer_length);
1706
1707 return 0;
1708 }
1709
1710 static int
1711 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1712 u64 persistent_fid, u64 volatile_fid, u8 info_class,
1713 size_t output_len, size_t min_len, void *data)
1714 {
1715 struct smb2_query_info_req *req;
1716 struct smb2_query_info_rsp *rsp = NULL;
1717 struct kvec iov[2];
1718 int rc = 0;
1719 int resp_buftype;
1720 struct TCP_Server_Info *server;
1721 struct cifs_ses *ses = tcon->ses;
1722
1723 cifs_dbg(FYI, "Query Info\n");
1724
1725 if (ses && (ses->server))
1726 server = ses->server;
1727 else
1728 return -EIO;
1729
1730 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1731 if (rc)
1732 return rc;
1733
1734 req->InfoType = SMB2_O_INFO_FILE;
1735 req->FileInfoClass = info_class;
1736 req->PersistentFileId = persistent_fid;
1737 req->VolatileFileId = volatile_fid;
1738 /* 4 for rfc1002 length field and 1 for Buffer */
1739 req->InputBufferOffset =
1740 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1741 req->OutputBufferLength = cpu_to_le32(output_len);
1742
1743 iov[0].iov_base = (char *)req;
1744 /* 4 for rfc1002 length field */
1745 iov[0].iov_len = get_rfc1002_length(req) + 4;
1746
1747 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1748 rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1749
1750 if (rc) {
1751 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1752 goto qinf_exit;
1753 }
1754
1755 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1756 le32_to_cpu(rsp->OutputBufferLength),
1757 &rsp->hdr, min_len, data);
1758
1759 qinf_exit:
1760 free_rsp_buf(resp_buftype, rsp);
1761 return rc;
1762 }
1763
1764 int
1765 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1766 u64 persistent_fid, u64 volatile_fid,
1767 struct smb2_file_all_info *data)
1768 {
1769 return query_info(xid, tcon, persistent_fid, volatile_fid,
1770 FILE_ALL_INFORMATION,
1771 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1772 sizeof(struct smb2_file_all_info), data);
1773 }
1774
1775 int
1776 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1777 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1778 {
1779 return query_info(xid, tcon, persistent_fid, volatile_fid,
1780 FILE_INTERNAL_INFORMATION,
1781 sizeof(struct smb2_file_internal_info),
1782 sizeof(struct smb2_file_internal_info), uniqueid);
1783 }
1784
1785 /*
1786 * This is a no-op for now. We're not really interested in the reply, but
1787 * rather in the fact that the server sent one and that server->lstrp
1788 * gets updated.
1789 *
1790 * FIXME: maybe we should consider checking that the reply matches request?
1791 */
1792 static void
1793 smb2_echo_callback(struct mid_q_entry *mid)
1794 {
1795 struct TCP_Server_Info *server = mid->callback_data;
1796 struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1797 unsigned int credits_received = 1;
1798
1799 if (mid->mid_state == MID_RESPONSE_RECEIVED)
1800 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1801
1802 mutex_lock(&server->srv_mutex);
1803 DeleteMidQEntry(mid);
1804 mutex_unlock(&server->srv_mutex);
1805 add_credits(server, credits_received, CIFS_ECHO_OP);
1806 }
1807
1808 int
1809 SMB2_echo(struct TCP_Server_Info *server)
1810 {
1811 struct smb2_echo_req *req;
1812 int rc = 0;
1813 struct kvec iov;
1814 struct smb_rqst rqst = { .rq_iov = &iov,
1815 .rq_nvec = 1 };
1816
1817 cifs_dbg(FYI, "In echo request\n");
1818
1819 rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1820 if (rc)
1821 return rc;
1822
1823 req->hdr.CreditRequest = cpu_to_le16(1);
1824
1825 iov.iov_base = (char *)req;
1826 /* 4 for rfc1002 length field */
1827 iov.iov_len = get_rfc1002_length(req) + 4;
1828
1829 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1830 CIFS_ECHO_OP);
1831 if (rc)
1832 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1833
1834 cifs_small_buf_release(req);
1835 return rc;
1836 }
1837
1838 int
1839 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1840 u64 volatile_fid)
1841 {
1842 struct smb2_flush_req *req;
1843 struct TCP_Server_Info *server;
1844 struct cifs_ses *ses = tcon->ses;
1845 struct kvec iov[1];
1846 int resp_buftype;
1847 int rc = 0;
1848
1849 cifs_dbg(FYI, "Flush\n");
1850
1851 if (ses && (ses->server))
1852 server = ses->server;
1853 else
1854 return -EIO;
1855
1856 rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1857 if (rc)
1858 return rc;
1859
1860 req->PersistentFileId = persistent_fid;
1861 req->VolatileFileId = volatile_fid;
1862
1863 iov[0].iov_base = (char *)req;
1864 /* 4 for rfc1002 length field */
1865 iov[0].iov_len = get_rfc1002_length(req) + 4;
1866
1867 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1868
1869 if (rc != 0)
1870 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1871
1872 free_rsp_buf(resp_buftype, iov[0].iov_base);
1873 return rc;
1874 }
1875
1876 /*
1877 * To form a chain of read requests, any read requests after the first should
1878 * have the end_of_chain boolean set to true.
1879 */
1880 static int
1881 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1882 unsigned int remaining_bytes, int request_type)
1883 {
1884 int rc = -EACCES;
1885 struct smb2_read_req *req = NULL;
1886
1887 rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1888 if (rc)
1889 return rc;
1890 if (io_parms->tcon->ses->server == NULL)
1891 return -ECONNABORTED;
1892
1893 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1894
1895 req->PersistentFileId = io_parms->persistent_fid;
1896 req->VolatileFileId = io_parms->volatile_fid;
1897 req->ReadChannelInfoOffset = 0; /* reserved */
1898 req->ReadChannelInfoLength = 0; /* reserved */
1899 req->Channel = 0; /* reserved */
1900 req->MinimumCount = 0;
1901 req->Length = cpu_to_le32(io_parms->length);
1902 req->Offset = cpu_to_le64(io_parms->offset);
1903
1904 if (request_type & CHAINED_REQUEST) {
1905 if (!(request_type & END_OF_CHAIN)) {
1906 /* 4 for rfc1002 length field */
1907 req->hdr.NextCommand =
1908 cpu_to_le32(get_rfc1002_length(req) + 4);
1909 } else /* END_OF_CHAIN */
1910 req->hdr.NextCommand = 0;
1911 if (request_type & RELATED_REQUEST) {
1912 req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1913 /*
1914 * Related requests use info from previous read request
1915 * in chain.
1916 */
1917 req->hdr.SessionId = 0xFFFFFFFF;
1918 req->hdr.TreeId = 0xFFFFFFFF;
1919 req->PersistentFileId = 0xFFFFFFFF;
1920 req->VolatileFileId = 0xFFFFFFFF;
1921 }
1922 }
1923 if (remaining_bytes > io_parms->length)
1924 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1925 else
1926 req->RemainingBytes = 0;
1927
1928 iov[0].iov_base = (char *)req;
1929 /* 4 for rfc1002 length field */
1930 iov[0].iov_len = get_rfc1002_length(req) + 4;
1931 return rc;
1932 }
1933
1934 static void
1935 smb2_readv_callback(struct mid_q_entry *mid)
1936 {
1937 struct cifs_readdata *rdata = mid->callback_data;
1938 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1939 struct TCP_Server_Info *server = tcon->ses->server;
1940 struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1941 unsigned int credits_received = 1;
1942 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1943 .rq_nvec = 1,
1944 .rq_pages = rdata->pages,
1945 .rq_npages = rdata->nr_pages,
1946 .rq_pagesz = rdata->pagesz,
1947 .rq_tailsz = rdata->tailsz };
1948
1949 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1950 __func__, mid->mid, mid->mid_state, rdata->result,
1951 rdata->bytes);
1952
1953 switch (mid->mid_state) {
1954 case MID_RESPONSE_RECEIVED:
1955 credits_received = le16_to_cpu(buf->CreditRequest);
1956 /* result already set, check signature */
1957 if (server->sign) {
1958 int rc;
1959
1960 rc = smb2_verify_signature(&rqst, server);
1961 if (rc)
1962 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1963 rc);
1964 }
1965 /* FIXME: should this be counted toward the initiating task? */
1966 task_io_account_read(rdata->got_bytes);
1967 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1968 break;
1969 case MID_REQUEST_SUBMITTED:
1970 case MID_RETRY_NEEDED:
1971 rdata->result = -EAGAIN;
1972 if (server->sign && rdata->got_bytes)
1973 /* reset bytes number since we can not check a sign */
1974 rdata->got_bytes = 0;
1975 /* FIXME: should this be counted toward the initiating task? */
1976 task_io_account_read(rdata->got_bytes);
1977 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1978 break;
1979 default:
1980 if (rdata->result != -ENODATA)
1981 rdata->result = -EIO;
1982 }
1983
1984 if (rdata->result)
1985 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1986
1987 queue_work(cifsiod_wq, &rdata->work);
1988 mutex_lock(&server->srv_mutex);
1989 DeleteMidQEntry(mid);
1990 mutex_unlock(&server->srv_mutex);
1991 add_credits(server, credits_received, 0);
1992 }
1993
1994 /* smb2_async_readv - send an async write, and set up mid to handle result */
1995 int
1996 smb2_async_readv(struct cifs_readdata *rdata)
1997 {
1998 int rc, flags = 0;
1999 struct smb2_hdr *buf;
2000 struct cifs_io_parms io_parms;
2001 struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2002 .rq_nvec = 1 };
2003 struct TCP_Server_Info *server;
2004
2005 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2006 __func__, rdata->offset, rdata->bytes);
2007
2008 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2009 io_parms.offset = rdata->offset;
2010 io_parms.length = rdata->bytes;
2011 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2012 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2013 io_parms.pid = rdata->pid;
2014
2015 server = io_parms.tcon->ses->server;
2016
2017 rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2018 if (rc) {
2019 if (rc == -EAGAIN && rdata->credits) {
2020 /* credits was reset by reconnect */
2021 rdata->credits = 0;
2022 /* reduce in_flight value since we won't send the req */
2023 spin_lock(&server->req_lock);
2024 server->in_flight--;
2025 spin_unlock(&server->req_lock);
2026 }
2027 return rc;
2028 }
2029
2030 buf = (struct smb2_hdr *)rdata->iov.iov_base;
2031 /* 4 for rfc1002 length field */
2032 rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2033
2034 if (rdata->credits) {
2035 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2036 SMB2_MAX_BUFFER_SIZE));
2037 spin_lock(&server->req_lock);
2038 server->credits += rdata->credits -
2039 le16_to_cpu(buf->CreditCharge);
2040 spin_unlock(&server->req_lock);
2041 wake_up(&server->request_q);
2042 flags = CIFS_HAS_CREDITS;
2043 }
2044
2045 kref_get(&rdata->refcount);
2046 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2047 cifs_readv_receive, smb2_readv_callback,
2048 rdata, flags);
2049 if (rc) {
2050 kref_put(&rdata->refcount, cifs_readdata_release);
2051 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2052 }
2053
2054 cifs_small_buf_release(buf);
2055 return rc;
2056 }
2057
2058 int
2059 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2060 unsigned int *nbytes, char **buf, int *buf_type)
2061 {
2062 int resp_buftype, rc = -EACCES;
2063 struct smb2_read_rsp *rsp = NULL;
2064 struct kvec iov[1];
2065
2066 *nbytes = 0;
2067 rc = smb2_new_read_req(iov, io_parms, 0, 0);
2068 if (rc)
2069 return rc;
2070
2071 rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2072 &resp_buftype, CIFS_LOG_ERROR);
2073
2074 rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2075
2076 if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2077 free_rsp_buf(resp_buftype, iov[0].iov_base);
2078 return 0;
2079 }
2080
2081 if (rc) {
2082 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2083 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2084 } else {
2085 *nbytes = le32_to_cpu(rsp->DataLength);
2086 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2087 (*nbytes > io_parms->length)) {
2088 cifs_dbg(FYI, "bad length %d for count %d\n",
2089 *nbytes, io_parms->length);
2090 rc = -EIO;
2091 *nbytes = 0;
2092 }
2093 }
2094
2095 if (*buf) {
2096 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
2097 *nbytes);
2098 free_rsp_buf(resp_buftype, iov[0].iov_base);
2099 } else if (resp_buftype != CIFS_NO_BUFFER) {
2100 *buf = iov[0].iov_base;
2101 if (resp_buftype == CIFS_SMALL_BUFFER)
2102 *buf_type = CIFS_SMALL_BUFFER;
2103 else if (resp_buftype == CIFS_LARGE_BUFFER)
2104 *buf_type = CIFS_LARGE_BUFFER;
2105 }
2106 return rc;
2107 }
2108
2109 /*
2110 * Check the mid_state and signature on received buffer (if any), and queue the
2111 * workqueue completion task.
2112 */
2113 static void
2114 smb2_writev_callback(struct mid_q_entry *mid)
2115 {
2116 struct cifs_writedata *wdata = mid->callback_data;
2117 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2118 struct TCP_Server_Info *server = tcon->ses->server;
2119 unsigned int written;
2120 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2121 unsigned int credits_received = 1;
2122
2123 switch (mid->mid_state) {
2124 case MID_RESPONSE_RECEIVED:
2125 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2126 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2127 if (wdata->result != 0)
2128 break;
2129
2130 written = le32_to_cpu(rsp->DataLength);
2131 /*
2132 * Mask off high 16 bits when bytes written as returned
2133 * by the server is greater than bytes requested by the
2134 * client. OS/2 servers are known to set incorrect
2135 * CountHigh values.
2136 */
2137 if (written > wdata->bytes)
2138 written &= 0xFFFF;
2139
2140 if (written < wdata->bytes)
2141 wdata->result = -ENOSPC;
2142 else
2143 wdata->bytes = written;
2144 break;
2145 case MID_REQUEST_SUBMITTED:
2146 case MID_RETRY_NEEDED:
2147 wdata->result = -EAGAIN;
2148 break;
2149 default:
2150 wdata->result = -EIO;
2151 break;
2152 }
2153
2154 if (wdata->result)
2155 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2156
2157 queue_work(cifsiod_wq, &wdata->work);
2158 mutex_lock(&server->srv_mutex);
2159 DeleteMidQEntry(mid);
2160 mutex_unlock(&server->srv_mutex);
2161 add_credits(tcon->ses->server, credits_received, 0);
2162 }
2163
2164 /* smb2_async_writev - send an async write, and set up mid to handle result */
2165 int
2166 smb2_async_writev(struct cifs_writedata *wdata,
2167 void (*release)(struct kref *kref))
2168 {
2169 int rc = -EACCES, flags = 0;
2170 struct smb2_write_req *req = NULL;
2171 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2172 struct TCP_Server_Info *server = tcon->ses->server;
2173 struct kvec iov;
2174 struct smb_rqst rqst;
2175
2176 rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2177 if (rc) {
2178 if (rc == -EAGAIN && wdata->credits) {
2179 /* credits was reset by reconnect */
2180 wdata->credits = 0;
2181 /* reduce in_flight value since we won't send the req */
2182 spin_lock(&server->req_lock);
2183 server->in_flight--;
2184 spin_unlock(&server->req_lock);
2185 }
2186 goto async_writev_out;
2187 }
2188
2189 req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2190
2191 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2192 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2193 req->WriteChannelInfoOffset = 0;
2194 req->WriteChannelInfoLength = 0;
2195 req->Channel = 0;
2196 req->Offset = cpu_to_le64(wdata->offset);
2197 /* 4 for rfc1002 length field */
2198 req->DataOffset = cpu_to_le16(
2199 offsetof(struct smb2_write_req, Buffer) - 4);
2200 req->RemainingBytes = 0;
2201
2202 /* 4 for rfc1002 length field and 1 for Buffer */
2203 iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2204 iov.iov_base = req;
2205
2206 rqst.rq_iov = &iov;
2207 rqst.rq_nvec = 1;
2208 rqst.rq_pages = wdata->pages;
2209 rqst.rq_npages = wdata->nr_pages;
2210 rqst.rq_pagesz = wdata->pagesz;
2211 rqst.rq_tailsz = wdata->tailsz;
2212
2213 cifs_dbg(FYI, "async write at %llu %u bytes\n",
2214 wdata->offset, wdata->bytes);
2215
2216 req->Length = cpu_to_le32(wdata->bytes);
2217
2218 inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2219
2220 if (wdata->credits) {
2221 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2222 SMB2_MAX_BUFFER_SIZE));
2223 spin_lock(&server->req_lock);
2224 server->credits += wdata->credits -
2225 le16_to_cpu(req->hdr.CreditCharge);
2226 spin_unlock(&server->req_lock);
2227 wake_up(&server->request_q);
2228 flags = CIFS_HAS_CREDITS;
2229 }
2230
2231 kref_get(&wdata->refcount);
2232 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2233 flags);
2234
2235 if (rc) {
2236 kref_put(&wdata->refcount, release);
2237 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2238 }
2239
2240 async_writev_out:
2241 cifs_small_buf_release(req);
2242 return rc;
2243 }
2244
2245 /*
2246 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2247 * The length field from io_parms must be at least 1 and indicates a number of
2248 * elements with data to write that begins with position 1 in iov array. All
2249 * data length is specified by count.
2250 */
2251 int
2252 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2253 unsigned int *nbytes, struct kvec *iov, int n_vec)
2254 {
2255 int rc = 0;
2256 struct smb2_write_req *req = NULL;
2257 struct smb2_write_rsp *rsp = NULL;
2258 int resp_buftype;
2259 *nbytes = 0;
2260
2261 if (n_vec < 1)
2262 return rc;
2263
2264 rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2265 if (rc)
2266 return rc;
2267
2268 if (io_parms->tcon->ses->server == NULL)
2269 return -ECONNABORTED;
2270
2271 req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2272
2273 req->PersistentFileId = io_parms->persistent_fid;
2274 req->VolatileFileId = io_parms->volatile_fid;
2275 req->WriteChannelInfoOffset = 0;
2276 req->WriteChannelInfoLength = 0;
2277 req->Channel = 0;
2278 req->Length = cpu_to_le32(io_parms->length);
2279 req->Offset = cpu_to_le64(io_parms->offset);
2280 /* 4 for rfc1002 length field */
2281 req->DataOffset = cpu_to_le16(
2282 offsetof(struct smb2_write_req, Buffer) - 4);
2283 req->RemainingBytes = 0;
2284
2285 iov[0].iov_base = (char *)req;
2286 /* 4 for rfc1002 length field and 1 for Buffer */
2287 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2288
2289 /* length of entire message including data to be written */
2290 inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2291
2292 rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2293 &resp_buftype, 0);
2294 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2295
2296 if (rc) {
2297 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2298 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2299 } else
2300 *nbytes = le32_to_cpu(rsp->DataLength);
2301
2302 free_rsp_buf(resp_buftype, rsp);
2303 return rc;
2304 }
2305
2306 static unsigned int
2307 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2308 {
2309 int len;
2310 unsigned int entrycount = 0;
2311 unsigned int next_offset = 0;
2312 FILE_DIRECTORY_INFO *entryptr;
2313
2314 if (bufstart == NULL)
2315 return 0;
2316
2317 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2318
2319 while (1) {
2320 entryptr = (FILE_DIRECTORY_INFO *)
2321 ((char *)entryptr + next_offset);
2322
2323 if ((char *)entryptr + size > end_of_buf) {
2324 cifs_dbg(VFS, "malformed search entry would overflow\n");
2325 break;
2326 }
2327
2328 len = le32_to_cpu(entryptr->FileNameLength);
2329 if ((char *)entryptr + len + size > end_of_buf) {
2330 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2331 end_of_buf);
2332 break;
2333 }
2334
2335 *lastentry = (char *)entryptr;
2336 entrycount++;
2337
2338 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2339 if (!next_offset)
2340 break;
2341 }
2342
2343 return entrycount;
2344 }
2345
2346 /*
2347 * Readdir/FindFirst
2348 */
2349 int
2350 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2351 u64 persistent_fid, u64 volatile_fid, int index,
2352 struct cifs_search_info *srch_inf)
2353 {
2354 struct smb2_query_directory_req *req;
2355 struct smb2_query_directory_rsp *rsp = NULL;
2356 struct kvec iov[2];
2357 int rc = 0;
2358 int len;
2359 int resp_buftype = CIFS_NO_BUFFER;
2360 unsigned char *bufptr;
2361 struct TCP_Server_Info *server;
2362 struct cifs_ses *ses = tcon->ses;
2363 __le16 asteriks = cpu_to_le16('*');
2364 char *end_of_smb;
2365 unsigned int output_size = CIFSMaxBufSize;
2366 size_t info_buf_size;
2367
2368 if (ses && (ses->server))
2369 server = ses->server;
2370 else
2371 return -EIO;
2372
2373 rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2374 if (rc)
2375 return rc;
2376
2377 switch (srch_inf->info_level) {
2378 case SMB_FIND_FILE_DIRECTORY_INFO:
2379 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2380 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2381 break;
2382 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2383 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2384 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2385 break;
2386 default:
2387 cifs_dbg(VFS, "info level %u isn't supported\n",
2388 srch_inf->info_level);
2389 rc = -EINVAL;
2390 goto qdir_exit;
2391 }
2392
2393 req->FileIndex = cpu_to_le32(index);
2394 req->PersistentFileId = persistent_fid;
2395 req->VolatileFileId = volatile_fid;
2396
2397 len = 0x2;
2398 bufptr = req->Buffer;
2399 memcpy(bufptr, &asteriks, len);
2400
2401 req->FileNameOffset =
2402 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2403 req->FileNameLength = cpu_to_le16(len);
2404 /*
2405 * BB could be 30 bytes or so longer if we used SMB2 specific
2406 * buffer lengths, but this is safe and close enough.
2407 */
2408 output_size = min_t(unsigned int, output_size, server->maxBuf);
2409 output_size = min_t(unsigned int, output_size, 2 << 15);
2410 req->OutputBufferLength = cpu_to_le32(output_size);
2411
2412 iov[0].iov_base = (char *)req;
2413 /* 4 for RFC1001 length and 1 for Buffer */
2414 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2415
2416 iov[1].iov_base = (char *)(req->Buffer);
2417 iov[1].iov_len = len;
2418
2419 inc_rfc1001_len(req, len - 1 /* Buffer */);
2420
2421 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2422 rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2423
2424 if (rc) {
2425 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2426 srch_inf->endOfSearch = true;
2427 rc = 0;
2428 }
2429 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2430 goto qdir_exit;
2431 }
2432
2433 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2434 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2435 info_buf_size);
2436 if (rc)
2437 goto qdir_exit;
2438
2439 srch_inf->unicode = true;
2440
2441 if (srch_inf->ntwrk_buf_start) {
2442 if (srch_inf->smallBuf)
2443 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2444 else
2445 cifs_buf_release(srch_inf->ntwrk_buf_start);
2446 }
2447 srch_inf->ntwrk_buf_start = (char *)rsp;
2448 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2449 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2450 /* 4 for rfc1002 length field */
2451 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2452 srch_inf->entries_in_buffer =
2453 num_entries(srch_inf->srch_entries_start, end_of_smb,
2454 &srch_inf->last_entry, info_buf_size);
2455 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2456 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2457 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2458 srch_inf->srch_entries_start, srch_inf->last_entry);
2459 if (resp_buftype == CIFS_LARGE_BUFFER)
2460 srch_inf->smallBuf = false;
2461 else if (resp_buftype == CIFS_SMALL_BUFFER)
2462 srch_inf->smallBuf = true;
2463 else
2464 cifs_dbg(VFS, "illegal search buffer type\n");
2465
2466 return rc;
2467
2468 qdir_exit:
2469 free_rsp_buf(resp_buftype, rsp);
2470 return rc;
2471 }
2472
2473 static int
2474 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2475 u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2476 unsigned int num, void **data, unsigned int *size)
2477 {
2478 struct smb2_set_info_req *req;
2479 struct smb2_set_info_rsp *rsp = NULL;
2480 struct kvec *iov;
2481 int rc = 0;
2482 int resp_buftype;
2483 unsigned int i;
2484 struct TCP_Server_Info *server;
2485 struct cifs_ses *ses = tcon->ses;
2486
2487 if (ses && (ses->server))
2488 server = ses->server;
2489 else
2490 return -EIO;
2491
2492 if (!num)
2493 return -EINVAL;
2494
2495 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2496 if (!iov)
2497 return -ENOMEM;
2498
2499 rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2500 if (rc) {
2501 kfree(iov);
2502 return rc;
2503 }
2504
2505 req->hdr.ProcessId = cpu_to_le32(pid);
2506
2507 req->InfoType = SMB2_O_INFO_FILE;
2508 req->FileInfoClass = info_class;
2509 req->PersistentFileId = persistent_fid;
2510 req->VolatileFileId = volatile_fid;
2511
2512 /* 4 for RFC1001 length and 1 for Buffer */
2513 req->BufferOffset =
2514 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2515 req->BufferLength = cpu_to_le32(*size);
2516
2517 inc_rfc1001_len(req, *size - 1 /* Buffer */);
2518
2519 memcpy(req->Buffer, *data, *size);
2520
2521 iov[0].iov_base = (char *)req;
2522 /* 4 for RFC1001 length */
2523 iov[0].iov_len = get_rfc1002_length(req) + 4;
2524
2525 for (i = 1; i < num; i++) {
2526 inc_rfc1001_len(req, size[i]);
2527 le32_add_cpu(&req->BufferLength, size[i]);
2528 iov[i].iov_base = (char *)data[i];
2529 iov[i].iov_len = size[i];
2530 }
2531
2532 rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2533 rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2534
2535 if (rc != 0)
2536 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2537
2538 free_rsp_buf(resp_buftype, rsp);
2539 kfree(iov);
2540 return rc;
2541 }
2542
2543 int
2544 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2545 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2546 {
2547 struct smb2_file_rename_info info;
2548 void **data;
2549 unsigned int size[2];
2550 int rc;
2551 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2552
2553 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2554 if (!data)
2555 return -ENOMEM;
2556
2557 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2558 /* 0 = fail if target already exists */
2559 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
2560 info.FileNameLength = cpu_to_le32(len);
2561
2562 data[0] = &info;
2563 size[0] = sizeof(struct smb2_file_rename_info);
2564
2565 data[1] = target_file;
2566 size[1] = len + 2 /* null */;
2567
2568 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2569 current->tgid, FILE_RENAME_INFORMATION, 2, data,
2570 size);
2571 kfree(data);
2572 return rc;
2573 }
2574
2575 int
2576 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2577 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2578 {
2579 struct smb2_file_link_info info;
2580 void **data;
2581 unsigned int size[2];
2582 int rc;
2583 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2584
2585 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2586 if (!data)
2587 return -ENOMEM;
2588
2589 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2590 /* 0 = fail if link already exists */
2591 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
2592 info.FileNameLength = cpu_to_le32(len);
2593
2594 data[0] = &info;
2595 size[0] = sizeof(struct smb2_file_link_info);
2596
2597 data[1] = target_file;
2598 size[1] = len + 2 /* null */;
2599
2600 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2601 current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2602 kfree(data);
2603 return rc;
2604 }
2605
2606 int
2607 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2608 u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2609 {
2610 struct smb2_file_eof_info info;
2611 void *data;
2612 unsigned int size;
2613
2614 info.EndOfFile = *eof;
2615
2616 data = &info;
2617 size = sizeof(struct smb2_file_eof_info);
2618
2619 if (is_falloc)
2620 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2621 pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2622 else
2623 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2624 pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2625 }
2626
2627 int
2628 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2629 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2630 {
2631 unsigned int size;
2632 size = sizeof(FILE_BASIC_INFO);
2633 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2634 current->tgid, FILE_BASIC_INFORMATION, 1,
2635 (void **)&buf, &size);
2636 }
2637
2638 int
2639 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2640 const u64 persistent_fid, const u64 volatile_fid,
2641 __u8 oplock_level)
2642 {
2643 int rc;
2644 struct smb2_oplock_break *req = NULL;
2645
2646 cifs_dbg(FYI, "SMB2_oplock_break\n");
2647 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2648
2649 if (rc)
2650 return rc;
2651
2652 req->VolatileFid = volatile_fid;
2653 req->PersistentFid = persistent_fid;
2654 req->OplockLevel = oplock_level;
2655 req->hdr.CreditRequest = cpu_to_le16(1);
2656
2657 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2658 /* SMB2 buffer freed by function above */
2659
2660 if (rc) {
2661 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2662 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2663 }
2664
2665 return rc;
2666 }
2667
2668 static void
2669 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2670 struct kstatfs *kst)
2671 {
2672 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2673 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2674 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2675 kst->f_bfree = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2676 kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2677 return;
2678 }
2679
2680 static int
2681 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2682 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2683 {
2684 int rc;
2685 struct smb2_query_info_req *req;
2686
2687 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2688
2689 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2690 return -EIO;
2691
2692 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2693 if (rc)
2694 return rc;
2695
2696 req->InfoType = SMB2_O_INFO_FILESYSTEM;
2697 req->FileInfoClass = level;
2698 req->PersistentFileId = persistent_fid;
2699 req->VolatileFileId = volatile_fid;
2700 /* 4 for rfc1002 length field and 1 for pad */
2701 req->InputBufferOffset =
2702 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2703 req->OutputBufferLength = cpu_to_le32(
2704 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2705
2706 iov->iov_base = (char *)req;
2707 /* 4 for rfc1002 length field */
2708 iov->iov_len = get_rfc1002_length(req) + 4;
2709 return 0;
2710 }
2711
2712 int
2713 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2714 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2715 {
2716 struct smb2_query_info_rsp *rsp = NULL;
2717 struct kvec iov;
2718 int rc = 0;
2719 int resp_buftype;
2720 struct cifs_ses *ses = tcon->ses;
2721 struct smb2_fs_full_size_info *info = NULL;
2722
2723 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2724 sizeof(struct smb2_fs_full_size_info),
2725 persistent_fid, volatile_fid);
2726 if (rc)
2727 return rc;
2728
2729 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2730 if (rc) {
2731 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2732 goto qfsinf_exit;
2733 }
2734 rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2735
2736 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2737 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2738 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2739 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2740 sizeof(struct smb2_fs_full_size_info));
2741 if (!rc)
2742 copy_fs_info_to_kstatfs(info, fsdata);
2743
2744 qfsinf_exit:
2745 free_rsp_buf(resp_buftype, iov.iov_base);
2746 return rc;
2747 }
2748
2749 int
2750 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2751 u64 persistent_fid, u64 volatile_fid, int level)
2752 {
2753 struct smb2_query_info_rsp *rsp = NULL;
2754 struct kvec iov;
2755 int rc = 0;
2756 int resp_buftype, max_len, min_len;
2757 struct cifs_ses *ses = tcon->ses;
2758 unsigned int rsp_len, offset;
2759
2760 if (level == FS_DEVICE_INFORMATION) {
2761 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2762 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2763 } else if (level == FS_ATTRIBUTE_INFORMATION) {
2764 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2765 min_len = MIN_FS_ATTR_INFO_SIZE;
2766 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2767 max_len = sizeof(struct smb3_fs_ss_info);
2768 min_len = sizeof(struct smb3_fs_ss_info);
2769 } else {
2770 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2771 return -EINVAL;
2772 }
2773
2774 rc = build_qfs_info_req(&iov, tcon, level, max_len,
2775 persistent_fid, volatile_fid);
2776 if (rc)
2777 return rc;
2778
2779 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2780 if (rc) {
2781 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2782 goto qfsattr_exit;
2783 }
2784 rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2785
2786 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2787 offset = le16_to_cpu(rsp->OutputBufferOffset);
2788 rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2789 if (rc)
2790 goto qfsattr_exit;
2791
2792 if (level == FS_ATTRIBUTE_INFORMATION)
2793 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2794 + (char *)&rsp->hdr, min_t(unsigned int,
2795 rsp_len, max_len));
2796 else if (level == FS_DEVICE_INFORMATION)
2797 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2798 + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2799 else if (level == FS_SECTOR_SIZE_INFORMATION) {
2800 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2801 (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2802 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2803 tcon->perf_sector_size =
2804 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2805 }
2806
2807 qfsattr_exit:
2808 free_rsp_buf(resp_buftype, iov.iov_base);
2809 return rc;
2810 }
2811
2812 int
2813 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2814 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2815 const __u32 num_lock, struct smb2_lock_element *buf)
2816 {
2817 int rc = 0;
2818 struct smb2_lock_req *req = NULL;
2819 struct kvec iov[2];
2820 int resp_buf_type;
2821 unsigned int count;
2822
2823 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2824
2825 rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2826 if (rc)
2827 return rc;
2828
2829 req->hdr.ProcessId = cpu_to_le32(pid);
2830 req->LockCount = cpu_to_le16(num_lock);
2831
2832 req->PersistentFileId = persist_fid;
2833 req->VolatileFileId = volatile_fid;
2834
2835 count = num_lock * sizeof(struct smb2_lock_element);
2836 inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2837
2838 iov[0].iov_base = (char *)req;
2839 /* 4 for rfc1002 length field and count for all locks */
2840 iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2841 iov[1].iov_base = (char *)buf;
2842 iov[1].iov_len = count;
2843
2844 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2845 rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2846 if (rc) {
2847 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2848 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2849 }
2850
2851 return rc;
2852 }
2853
2854 int
2855 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2856 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2857 const __u64 length, const __u64 offset, const __u32 lock_flags,
2858 const bool wait)
2859 {
2860 struct smb2_lock_element lock;
2861
2862 lock.Offset = cpu_to_le64(offset);
2863 lock.Length = cpu_to_le64(length);
2864 lock.Flags = cpu_to_le32(lock_flags);
2865 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2866 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2867
2868 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2869 }
2870
2871 int
2872 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2873 __u8 *lease_key, const __le32 lease_state)
2874 {
2875 int rc;
2876 struct smb2_lease_ack *req = NULL;
2877
2878 cifs_dbg(FYI, "SMB2_lease_break\n");
2879 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2880
2881 if (rc)
2882 return rc;
2883
2884 req->hdr.CreditRequest = cpu_to_le16(1);
2885 req->StructureSize = cpu_to_le16(36);
2886 inc_rfc1001_len(req, 12);
2887
2888 memcpy(req->LeaseKey, lease_key, 16);
2889 req->LeaseState = lease_state;
2890
2891 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2892 /* SMB2 buffer freed by function above */
2893
2894 if (rc) {
2895 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2896 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2897 }
2898
2899 return rc;
2900 }
Linux with added FPC-III support