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CIFS: Fix NULL pointer deref on SMB2_tcon() failure
[linux-block.git] / fs / cifs / smb2pdu.c
CommitLineData
ec2e4523
PS		 1/*
2 * fs/cifs/smb2pdu.c
3 *
2b80d049 4 * Copyright (C) International Business Machines Corp., 2009, 2013
ec2e4523
PS		 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>
09a4707e 34#include <linux/task_io_accounting_ops.h>
ec2e4523 35#include <linux/uaccess.h>
c6e970a0 36#include <linux/uuid.h>
33319141 37#include <linux/pagemap.h>
ec2e4523
PS		 38#include <linux/xattr.h>
39#include "smb2pdu.h"
40#include "cifsglob.h"
41#include "cifsacl.h"
42#include "cifsproto.h"
43#include "smb2proto.h"
44#include "cifs_unicode.h"
45#include "cifs_debug.h"
46#include "ntlmssp.h"
47#include "smb2status.h"
09a4707e 48#include "smb2glob.h"
d324f08d 49#include "cifspdu.h"
ceb1b0b9 50#include "cifs_spnego.h"
ec2e4523
PS		 51
52/*
53 * The following table defines the expected "StructureSize" of SMB2 requests
54 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
55 *
56 * Note that commands are defined in smb2pdu.h in le16 but the array below is
57 * indexed by command in host byte order.
58 */
59static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
60 /* SMB2_NEGOTIATE */ 36,
61 /* SMB2_SESSION_SETUP */ 25,
62 /* SMB2_LOGOFF */ 4,
63 /* SMB2_TREE_CONNECT */ 9,
64 /* SMB2_TREE_DISCONNECT */ 4,
65 /* SMB2_CREATE */ 57,
66 /* SMB2_CLOSE */ 24,
67 /* SMB2_FLUSH */ 24,
68 /* SMB2_READ */ 49,
69 /* SMB2_WRITE */ 49,
70 /* SMB2_LOCK */ 48,
71 /* SMB2_IOCTL */ 57,
72 /* SMB2_CANCEL */ 4,
73 /* SMB2_ECHO */ 4,
74 /* SMB2_QUERY_DIRECTORY */ 33,
75 /* SMB2_CHANGE_NOTIFY */ 32,
76 /* SMB2_QUERY_INFO */ 41,
77 /* SMB2_SET_INFO */ 33,
78 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
79};
80
7fb8986e
PS		 81static int encryption_required(const struct cifs_tcon *tcon)
82{
ae6f8dd4
PS		 83 if (!tcon)
84 return 0;
7fb8986e
PS		 85 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
86 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
87 return 1;
ae6f8dd4
PS		 88 if (tcon->seal &&
89 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
90 return 1;
7fb8986e
PS		 91 return 0;
92}
ec2e4523
PS		 93
94static void
cb200bd6 95smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
ec2e4523
PS		 96 const struct cifs_tcon *tcon)
97{
31473fc4
PS		 98 shdr->ProtocolId = SMB2_PROTO_NUMBER;
99 shdr->StructureSize = cpu_to_le16(64);
100 shdr->Command = smb2_cmd;
7d414f39
RL		 101 if (tcon && tcon->ses && tcon->ses->server) {
102 struct TCP_Server_Info *server = tcon->ses->server;
103
104 spin_lock(&server->req_lock);
105 /* Request up to 2 credits but don't go over the limit. */
141891f4 106 if (server->credits >= server->max_credits)
31473fc4 107 shdr->CreditRequest = cpu_to_le16(0);
7d414f39 108 else
31473fc4 109 shdr->CreditRequest = cpu_to_le16(
141891f4 110 min_t(int, server->max_credits -
7d414f39
RL		 111 server->credits, 2));
112 spin_unlock(&server->req_lock);
113 } else {
31473fc4 114 shdr->CreditRequest = cpu_to_le16(2);
7d414f39 115 }
31473fc4 116 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
ec2e4523
PS		 117
118 if (!tcon)
119 goto out;
120
2b80d049
SF		 121 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
122 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
1dc92c45 123 if ((tcon->ses) && (tcon->ses->server) &&
84ceeb96 124 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
31473fc4 125 shdr->CreditCharge = cpu_to_le16(1);
2b80d049
SF		 126 /* else CreditCharge MBZ */
127
31473fc4 128 shdr->TreeId = tcon->tid;
ec2e4523
PS		 129 /* Uid is not converted */
130 if (tcon->ses)
31473fc4 131 shdr->SessionId = tcon->ses->Suid;
f87ab88b
SF		 132
133 /*
134 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
135 * to pass the path on the Open SMB prefixed by \\server\share.
136 * Not sure when we would need to do the augmented path (if ever) and
137 * setting this flag breaks the SMB2 open operation since it is
138 * illegal to send an empty path name (without \\server\share prefix)
139 * when the DFS flag is set in the SMB open header. We could
140 * consider setting the flag on all operations other than open
141 * but it is safer to net set it for now.
142 */
143/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
31473fc4 144 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
f87ab88b 145
7fb8986e
PS		 146 if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
147 !encryption_required(tcon))
31473fc4 148 shdr->Flags |= SMB2_FLAGS_SIGNED;
ec2e4523 149out:
ec2e4523
PS		 150 return;
151}
152
153static int
154smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
155{
156 int rc = 0;
aa24d1e9
PS		 157 struct nls_table *nls_codepage;
158 struct cifs_ses *ses;
159 struct TCP_Server_Info *server;
160
161 /*
162 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
163 * check for tcp and smb session status done differently
164 * for those three - in the calling routine.
165 */
166 if (tcon == NULL)
167 return rc;
168
169 if (smb2_command == SMB2_TREE_CONNECT)
170 return rc;
171
172 if (tcon->tidStatus == CifsExiting) {
173 /*
174 * only tree disconnect, open, and write,
175 * (and ulogoff which does not have tcon)
176 * are allowed as we start force umount.
177 */
178 if ((smb2_command != SMB2_WRITE) &&
179 (smb2_command != SMB2_CREATE) &&
180 (smb2_command != SMB2_TREE_DISCONNECT)) {
f96637be
JP		 181 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
182 smb2_command);
aa24d1e9
PS		 183 return -ENODEV;
184 }
185 }
186 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
187 (!tcon->ses->server))
188 return -EIO;
189
190 ses = tcon->ses;
191 server = ses->server;
192
193 /*
194 * Give demultiplex thread up to 10 seconds to reconnect, should be
195 * greater than cifs socket timeout which is 7 seconds
196 */
197 while (server->tcpStatus == CifsNeedReconnect) {
198 /*
199 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
200 * here since they are implicitly done when session drops.
201 */
202 switch (smb2_command) {
203 /*
204 * BB Should we keep oplock break and add flush to exceptions?
205 */
206 case SMB2_TREE_DISCONNECT:
207 case SMB2_CANCEL:
208 case SMB2_CLOSE:
209 case SMB2_OPLOCK_BREAK:
210 return -EAGAIN;
211 }
212
213 wait_event_interruptible_timeout(server->response_q,
214 (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
215
216 /* are we still trying to reconnect? */
217 if (server->tcpStatus != CifsNeedReconnect)
218 break;
219
220 /*
221 * on "soft" mounts we wait once. Hard mounts keep
222 * retrying until process is killed or server comes
223 * back on-line
224 */
225 if (!tcon->retry) {
f96637be 226 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
aa24d1e9
PS		 227 return -EHOSTDOWN;
228 }
229 }
230
231 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
232 return rc;
233
234 nls_codepage = load_nls_default();
235
236 /*
237 * need to prevent multiple threads trying to simultaneously reconnect
238 * the same SMB session
239 */
240 mutex_lock(&tcon->ses->session_mutex);
76e75270
SC		 241
242 /*
243 * Recheck after acquire mutex. If another thread is negotiating
244 * and the server never sends an answer the socket will be closed
245 * and tcpStatus set to reconnect.
246 */
247 if (server->tcpStatus == CifsNeedReconnect) {
248 rc = -EHOSTDOWN;
249 mutex_unlock(&tcon->ses->session_mutex);
250 goto out;
251 }
252
aa24d1e9
PS		 253 rc = cifs_negotiate_protocol(0, tcon->ses);
254 if (!rc && tcon->ses->need_reconnect)
255 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
256
257 if (rc || !tcon->need_reconnect) {
258 mutex_unlock(&tcon->ses->session_mutex);
259 goto out;
260 }
261
262 cifs_mark_open_files_invalid(tcon);
96a988ff
PS		 263 if (tcon->use_persistent)
264 tcon->need_reopen_files = true;
52ace1ef 265
aa24d1e9
PS		 266 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
267 mutex_unlock(&tcon->ses->session_mutex);
52ace1ef 268
f96637be 269 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
aa24d1e9
PS		 270 if (rc)
271 goto out;
96a988ff
PS		 272
273 if (smb2_command != SMB2_INTERNAL_CMD)
274 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
275
aa24d1e9 276 atomic_inc(&tconInfoReconnectCount);
aa24d1e9
PS		 277out:
278 /*
279 * Check if handle based operation so we know whether we can continue
280 * or not without returning to caller to reset file handle.
281 */
282 /*
283 * BB Is flush done by server on drop of tcp session? Should we special
284 * case it and skip above?
285 */
286 switch (smb2_command) {
287 case SMB2_FLUSH:
288 case SMB2_READ:
289 case SMB2_WRITE:
290 case SMB2_LOCK:
291 case SMB2_IOCTL:
292 case SMB2_QUERY_DIRECTORY:
293 case SMB2_CHANGE_NOTIFY:
294 case SMB2_QUERY_INFO:
295 case SMB2_SET_INFO:
4772c795 296 rc = -EAGAIN;
aa24d1e9
PS		 297 }
298 unload_nls(nls_codepage);
ec2e4523
PS		 299 return rc;
300}
301
cb200bd6
PS		 302static void
303fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
304 unsigned int *total_len)
305{
306 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
307 /* lookup word count ie StructureSize from table */
308 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
309
310 /*
311 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
312 * largest operations (Create)
313 */
314 memset(buf, 0, 256);
315
316 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
317 spdu->StructureSize2 = cpu_to_le16(parmsize);
318
319 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
320}
321
b8f57ee8
PS		 322/* init request without RFC1001 length at the beginning */
323static int
324smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
325 void **request_buf, unsigned int *total_len)
326{
327 int rc;
328 struct smb2_sync_hdr *shdr;
329
330 rc = smb2_reconnect(smb2_command, tcon);
331 if (rc)
332 return rc;
333
334 /* BB eventually switch this to SMB2 specific small buf size */
335 *request_buf = cifs_small_buf_get();
336 if (*request_buf == NULL) {
337 /* BB should we add a retry in here if not a writepage? */
338 return -ENOMEM;
339 }
340
341 shdr = (struct smb2_sync_hdr *)(*request_buf);
342
343 fill_small_buf(smb2_command, tcon, shdr, total_len);
344
345 if (tcon != NULL) {
346#ifdef CONFIG_CIFS_STATS2
347 uint16_t com_code = le16_to_cpu(smb2_command);
348
349 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
350#endif
351 cifs_stats_inc(&tcon->num_smbs_sent);
352 }
353
354 return rc;
355}
356
ec2e4523
PS		 357/*
358 * Allocate and return pointer to an SMB request hdr, and set basic
359 * SMB information in the SMB header. If the return code is zero, this
b8f57ee8
PS		 360 * function must have filled in request_buf pointer. The returned buffer
361 * has RFC1001 length at the beginning.
ec2e4523
PS		 362 */
363static int
364small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
365 void **request_buf)
366{
cb200bd6
PS		 367 int rc;
368 unsigned int total_len;
369 struct smb2_pdu *pdu;
ec2e4523
PS		 370
371 rc = smb2_reconnect(smb2_command, tcon);
372 if (rc)
373 return rc;
374
375 /* BB eventually switch this to SMB2 specific small buf size */
376 *request_buf = cifs_small_buf_get();
377 if (*request_buf == NULL) {
378 /* BB should we add a retry in here if not a writepage? */
379 return -ENOMEM;
380 }
381
cb200bd6
PS		 382 pdu = (struct smb2_pdu *)(*request_buf);
383
384 fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
385
386 /* Note this is only network field converted to big endian */
387 pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
ec2e4523
PS		 388
389 if (tcon != NULL) {
390#ifdef CONFIG_CIFS_STATS2
ec2e4523
PS		 391 uint16_t com_code = le16_to_cpu(smb2_command);
392 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
ec2e4523
PS		 393#endif
394 cifs_stats_inc(&tcon->num_smbs_sent);
395 }
396
397 return rc;
398}
399
ebb3a9d4
SF		 400#ifdef CONFIG_CIFS_SMB311
401/* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
402#define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) - 4 */
403
404
405#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
406#define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
407
408static void
409build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
410{
411 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
412 pneg_ctxt->DataLength = cpu_to_le16(38);
413 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
414 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
415 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
416 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
417}
418
419static void
420build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
421{
422 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
423 pneg_ctxt->DataLength = cpu_to_le16(6);
424 pneg_ctxt->CipherCount = cpu_to_le16(2);
425 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
426 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
427}
428
429static void
430assemble_neg_contexts(struct smb2_negotiate_req *req)
431{
432
433 /* +4 is to account for the RFC1001 len field */
434 char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
435
436 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
437 /* Add 2 to size to round to 8 byte boundary */
438 pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
439 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
440 req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
441 req->NegotiateContextCount = cpu_to_le16(2);
23586b66 442 inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context)
ebb3a9d4
SF		 443 + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
444}
445#else
446static void assemble_neg_contexts(struct smb2_negotiate_req *req)
447{
448 return;
449}
450#endif /* SMB311 */
451
ec2e4523
PS		 452/*
453 *
454 * SMB2 Worker functions follow:
455 *
456 * The general structure of the worker functions is:
457 * 1) Call smb2_init (assembles SMB2 header)
458 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
459 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
460 * 4) Decode SMB2 command specific fields in the fixed length area
461 * 5) Decode variable length data area (if any for this SMB2 command type)
462 * 6) Call free smb buffer
463 * 7) return
464 *
465 */
466
467int
468SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
469{
470 struct smb2_negotiate_req *req;
471 struct smb2_negotiate_rsp *rsp;
472 struct kvec iov[1];
da502f7d 473 struct kvec rsp_iov;
ec2e4523
PS		 474 int rc = 0;
475 int resp_buftype;
3534b850 476 struct TCP_Server_Info *server = ses->server;
ec2e4523
PS		 477 int blob_offset, blob_length;
478 char *security_blob;
479 int flags = CIFS_NEG_OP;
480
f96637be 481 cifs_dbg(FYI, "Negotiate protocol\n");
ec2e4523 482
3534b850
JL		 483 if (!server) {
484 WARN(1, "%s: server is NULL!\n", __func__);
485 return -EIO;
ec2e4523
PS		 486 }
487
488 rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
489 if (rc)
490 return rc;
491
31473fc4 492 req->hdr.sync_hdr.SessionId = 0;
ec2e4523 493
9764c02f
SF		 494 if (strcmp(ses->server->vals->version_string,
495 SMB3ANY_VERSION_STRING) == 0) {
496 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
497 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
498 req->DialectCount = cpu_to_le16(2);
499 inc_rfc1001_len(req, 4);
500 } else if (strcmp(ses->server->vals->version_string,
501 SMBDEFAULT_VERSION_STRING) == 0) {
502 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
503 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
504 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
505 req->DialectCount = cpu_to_le16(3);
506 inc_rfc1001_len(req, 6);
507 } else {
508 /* otherwise send specific dialect */
509 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
510 req->DialectCount = cpu_to_le16(1);
511 inc_rfc1001_len(req, 2);
512 }
ec2e4523
PS		 513
514 /* only one of SMB2 signing flags may be set in SMB2 request */
38d77c50 515 if (ses->sign)
9cd2e62c 516 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
38d77c50 517 else if (global_secflags & CIFSSEC_MAY_SIGN)
9cd2e62c 518 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
38d77c50
JL		 519 else
520 req->SecurityMode = 0;
ec2e4523 521
e4aa25e7 522 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
ec2e4523 523
3c5f9be1
SF		 524 /* ClientGUID must be zero for SMB2.02 dialect */
525 if (ses->server->vals->protocol_id == SMB20_PROT_ID)
526 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
ebb3a9d4 527 else {
3c5f9be1
SF		 528 memcpy(req->ClientGUID, server->client_guid,
529 SMB2_CLIENT_GUID_SIZE);
ebb3a9d4
SF		 530 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
531 assemble_neg_contexts(req);
532 }
ec2e4523
PS		 533 iov[0].iov_base = (char *)req;
534 /* 4 for rfc1002 length field */
535 iov[0].iov_len = get_rfc1002_length(req) + 4;
536
da502f7d
PS		 537 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
538 cifs_small_buf_release(req);
539 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
ec2e4523
PS		 540 /*
541 * No tcon so can't do
542 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
543 */
7e682f76
SF		 544 if (rc == -EOPNOTSUPP) {
545 cifs_dbg(VFS, "Dialect not supported by server. Consider "
9764c02f 546 "specifying vers=1.0 or vers=2.0 on mount for accessing"
7e682f76
SF		 547 " older servers\n");
548 goto neg_exit;
549 } else if (rc != 0)
ec2e4523
PS		 550 goto neg_exit;
551
9764c02f
SF		 552 if (strcmp(ses->server->vals->version_string,
553 SMB3ANY_VERSION_STRING) == 0) {
554 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
555 cifs_dbg(VFS,
556 "SMB2 dialect returned but not requested\n");
557 return -EIO;
558 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
559 cifs_dbg(VFS,
560 "SMB2.1 dialect returned but not requested\n");
561 return -EIO;
562 }
563 } else if (strcmp(ses->server->vals->version_string,
564 SMBDEFAULT_VERSION_STRING) == 0) {
565 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
566 cifs_dbg(VFS,
567 "SMB2 dialect returned but not requested\n");
568 return -EIO;
569 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
570 /* ops set to 3.0 by default for default so update */
571 ses->server->ops = &smb21_operations;
572 }
590d08d3
SF		 573 } else if (le16_to_cpu(rsp->DialectRevision) !=
574 ses->server->vals->protocol_id) {
9764c02f
SF		 575 /* if requested single dialect ensure returned dialect matched */
576 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
590d08d3 577 le16_to_cpu(rsp->DialectRevision));
9764c02f
SF		 578 return -EIO;
579 }
580
f96637be 581 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
ec2e4523 582
e4aa25e7 583 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
f96637be 584 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
e4aa25e7 585 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
f96637be 586 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
e4aa25e7 587 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
f96637be 588 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
20b6d8b4
SF		 589 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
590 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
5f7fbf73
SF		 591#ifdef CONFIG_CIFS_SMB311
592 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
593 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
594#endif /* SMB311 */
ec2e4523 595 else {
f799d623 596 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
f96637be 597 le16_to_cpu(rsp->DialectRevision));
ec2e4523
PS		 598 rc = -EIO;
599 goto neg_exit;
600 }
601 server->dialect = le16_to_cpu(rsp->DialectRevision);
602
9764c02f
SF		 603 /* BB: add check that dialect was valid given dialect(s) we asked for */
604
e598d1d8
JL		 605 /* SMB2 only has an extended negflavor */
606 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
2365c4ea
PS		 607 /* set it to the maximum buffer size value we can send with 1 credit */
608 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
609 SMB2_MAX_BUFFER_SIZE);
ec2e4523
PS		 610 server->max_read = le32_to_cpu(rsp->MaxReadSize);
611 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
612 /* BB Do we need to validate the SecurityMode? */
613 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
614 server->capabilities = le32_to_cpu(rsp->Capabilities);
29e20f9c
PS		 615 /* Internal types */
616 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
ec2e4523
PS		 617
618 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
619 &rsp->hdr);
5d875cc9
SF		 620 /*
621 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
622 * for us will be
623 * ses->sectype = RawNTLMSSP;
624 * but for time being this is our only auth choice so doesn't matter.
625 * We just found a server which sets blob length to zero expecting raw.
626 */
67dbea2c 627 if (blob_length == 0) {
5d875cc9 628 cifs_dbg(FYI, "missing security blob on negprot\n");
67dbea2c
PS		 629 server->sec_ntlmssp = true;
630 }
3c1bf7e4 631
38d77c50 632 rc = cifs_enable_signing(server, ses->sign);
9ddec561
JL		 633 if (rc)
634 goto neg_exit;
ceb1b0b9 635 if (blob_length) {
ebdd207e 636 rc = decode_negTokenInit(security_blob, blob_length, server);
ceb1b0b9
SF		 637 if (rc == 1)
638 rc = 0;
639 else if (rc == 0)
640 rc = -EIO;
ec2e4523 641 }
ec2e4523
PS		 642neg_exit:
643 free_rsp_buf(resp_buftype, rsp);
644 return rc;
645}
5478f9ba 646
ff1c038a
SF		 647int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
648{
649 int rc = 0;
650 struct validate_negotiate_info_req vneg_inbuf;
651 struct validate_negotiate_info_rsp *pneg_rsp;
652 u32 rsplen;
9764c02f 653 u32 inbuflen; /* max of 4 dialects */
ff1c038a
SF		 654
655 cifs_dbg(FYI, "validate negotiate\n");
656
657 /*
658 * validation ioctl must be signed, so no point sending this if we
0603c96f
SF		 659 * can not sign it (ie are not known user). Even if signing is not
660 * required (enabled but not negotiated), in those cases we selectively
ff1c038a 661 * sign just this, the first and only signed request on a connection.
0603c96f 662 * Having validation of negotiate info helps reduce attack vectors.
ff1c038a 663 */
0603c96f 664 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
ff1c038a
SF		 665 return 0; /* validation requires signing */
666
0603c96f
SF		 667 if (tcon->ses->user_name == NULL) {
668 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
669 return 0; /* validation requires signing */
670 }
671
672 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
673 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
674
ff1c038a
SF		 675 vneg_inbuf.Capabilities =
676 cpu_to_le32(tcon->ses->server->vals->req_capabilities);
39552ea8
SP		 677 memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
678 SMB2_CLIENT_GUID_SIZE);
ff1c038a
SF		 679
680 if (tcon->ses->sign)
681 vneg_inbuf.SecurityMode =
682 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
683 else if (global_secflags & CIFSSEC_MAY_SIGN)
684 vneg_inbuf.SecurityMode =
685 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
686 else
687 vneg_inbuf.SecurityMode = 0;
688
9764c02f
SF		 689
690 if (strcmp(tcon->ses->server->vals->version_string,
691 SMB3ANY_VERSION_STRING) == 0) {
692 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
693 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
694 vneg_inbuf.DialectCount = cpu_to_le16(2);
695 /* structure is big enough for 3 dialects, sending only 2 */
696 inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
697 } else if (strcmp(tcon->ses->server->vals->version_string,
698 SMBDEFAULT_VERSION_STRING) == 0) {
699 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
700 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
701 vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
702 vneg_inbuf.DialectCount = cpu_to_le16(3);
703 /* structure is big enough for 3 dialects */
704 inbuflen = sizeof(struct validate_negotiate_info_req);
705 } else {
706 /* otherwise specific dialect was requested */
707 vneg_inbuf.Dialects[0] =
708 cpu_to_le16(tcon->ses->server->vals->protocol_id);
709 vneg_inbuf.DialectCount = cpu_to_le16(1);
710 /* structure is big enough for 3 dialects, sending only 1 */
711 inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
712 }
ff1c038a
SF		 713
714 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
715 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
51146625 716 false /* use_ipc */,
ff1c038a
SF		 717 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
718 (char **)&pneg_rsp, &rsplen);
719
720 if (rc != 0) {
721 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
722 return -EIO;
723 }
724
725 if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
7db0a6ef
SF		 726 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
727 rsplen);
728
729 /* relax check since Mac returns max bufsize allowed on ioctl */
730 if (rsplen > CIFSMaxBufSize)
731 return -EIO;
ff1c038a
SF		 732 }
733
734 /* check validate negotiate info response matches what we got earlier */
735 if (pneg_rsp->Dialect !=
736 cpu_to_le16(tcon->ses->server->vals->protocol_id))
737 goto vneg_out;
738
739 if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
740 goto vneg_out;
741
742 /* do not validate server guid because not saved at negprot time yet */
743
744 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
745 SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
746 goto vneg_out;
747
748 /* validate negotiate successful */
749 cifs_dbg(FYI, "validate negotiate info successful\n");
750 return 0;
751
752vneg_out:
753 cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
754 return -EIO;
755}
756
ef65aaed
SP		 757enum securityEnum
758smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
759{
760 switch (requested) {
761 case Kerberos:
762 case RawNTLMSSP:
763 return requested;
764 case NTLMv2:
765 return RawNTLMSSP;
766 case Unspecified:
767 if (server->sec_ntlmssp &&
768 (global_secflags & CIFSSEC_MAY_NTLMSSP))
769 return RawNTLMSSP;
770 if ((server->sec_kerberos || server->sec_mskerberos) &&
771 (global_secflags & CIFSSEC_MAY_KRB5))
772 return Kerberos;
773 /* Fallthrough */
774 default:
775 return Unspecified;
776 }
777}
778
3baf1a7b
SP		 779struct SMB2_sess_data {
780 unsigned int xid;
781 struct cifs_ses *ses;
782 struct nls_table *nls_cp;
783 void (*func)(struct SMB2_sess_data *);
784 int result;
785 u64 previous_session;
786
787 /* we will send the SMB in three pieces:
788 * a fixed length beginning part, an optional
789 * SPNEGO blob (which can be zero length), and a
790 * last part which will include the strings
791 * and rest of bcc area. This allows us to avoid
792 * a large buffer 17K allocation
793 */
794 int buf0_type;
795 struct kvec iov[2];
796};
797
798static int
799SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
800{
801 int rc;
802 struct cifs_ses *ses = sess_data->ses;
803 struct smb2_sess_setup_req *req;
804 struct TCP_Server_Info *server = ses->server;
805
806 rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
807 if (rc)
808 return rc;
809
31473fc4
PS		 810 /* First session, not a reauthenticate */
811 req->hdr.sync_hdr.SessionId = 0;
3baf1a7b
SP		 812
813 /* if reconnect, we need to send previous sess id, otherwise it is 0 */
814 req->PreviousSessionId = sess_data->previous_session;
815
816 req->Flags = 0; /* MBZ */
817 /* to enable echos and oplocks */
31473fc4 818 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
3baf1a7b
SP		 819
820 /* only one of SMB2 signing flags may be set in SMB2 request */
821 if (server->sign)
822 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
823 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
824 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
825 else
826 req->SecurityMode = 0;
827
828 req->Capabilities = 0;
829 req->Channel = 0; /* MBZ */
830
831 sess_data->iov[0].iov_base = (char *)req;
832 /* 4 for rfc1002 length field and 1 for pad */
833 sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
834 /*
835 * This variable will be used to clear the buffer
836 * allocated above in case of any error in the calling function.
837 */
838 sess_data->buf0_type = CIFS_SMALL_BUFFER;
839
840 return 0;
841}
842
843static void
844SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
845{
846 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
847 sess_data->buf0_type = CIFS_NO_BUFFER;
848}
849
850static int
851SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
852{
853 int rc;
854 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
da502f7d 855 struct kvec rsp_iov = { NULL, 0 };
3baf1a7b
SP		 856
857 /* Testing shows that buffer offset must be at location of Buffer[0] */
858 req->SecurityBufferOffset =
859 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
860 1 /* pad */ - 4 /* rfc1001 len */);
861 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
862
863 inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
864
865 /* BB add code to build os and lm fields */
866
867 rc = SendReceive2(sess_data->xid, sess_data->ses,
868 sess_data->iov, 2,
869 &sess_data->buf0_type,
da502f7d
PS		 870 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
871 cifs_small_buf_release(sess_data->iov[0].iov_base);
872 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
3baf1a7b
SP		 873
874 return rc;
875}
876
877static int
878SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
879{
880 int rc = 0;
881 struct cifs_ses *ses = sess_data->ses;
882
883 mutex_lock(&ses->server->srv_mutex);
cabfb368 884 if (ses->server->ops->generate_signingkey) {
3baf1a7b 885 rc = ses->server->ops->generate_signingkey(ses);
3baf1a7b
SP		 886 if (rc) {
887 cifs_dbg(FYI,
888 "SMB3 session key generation failed\n");
889 mutex_unlock(&ses->server->srv_mutex);
cabfb368 890 return rc;
3baf1a7b
SP		 891 }
892 }
893 if (!ses->server->session_estab) {
894 ses->server->sequence_number = 0x2;
895 ses->server->session_estab = true;
896 }
897 mutex_unlock(&ses->server->srv_mutex);
898
899 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
900 spin_lock(&GlobalMid_Lock);
901 ses->status = CifsGood;
902 ses->need_reconnect = false;
903 spin_unlock(&GlobalMid_Lock);
3baf1a7b
SP		 904 return rc;
905}
906
907#ifdef CONFIG_CIFS_UPCALL
908static void
909SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
910{
911 int rc;
912 struct cifs_ses *ses = sess_data->ses;
913 struct cifs_spnego_msg *msg;
914 struct key *spnego_key = NULL;
915 struct smb2_sess_setup_rsp *rsp = NULL;
916
917 rc = SMB2_sess_alloc_buffer(sess_data);
918 if (rc)
919 goto out;
920
921 spnego_key = cifs_get_spnego_key(ses);
922 if (IS_ERR(spnego_key)) {
923 rc = PTR_ERR(spnego_key);
924 spnego_key = NULL;
925 goto out;
926 }
927
928 msg = spnego_key->payload.data[0];
929 /*
930 * check version field to make sure that cifs.upcall is
931 * sending us a response in an expected form
932 */
933 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
934 cifs_dbg(VFS,
935 "bad cifs.upcall version. Expected %d got %d",
936 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
937 rc = -EKEYREJECTED;
938 goto out_put_spnego_key;
939 }
940
941 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
942 GFP_KERNEL);
943 if (!ses->auth_key.response) {
944 cifs_dbg(VFS,
945 "Kerberos can't allocate (%u bytes) memory",
946 msg->sesskey_len);
947 rc = -ENOMEM;
948 goto out_put_spnego_key;
949 }
950 ses->auth_key.len = msg->sesskey_len;
951
952 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
953 sess_data->iov[1].iov_len = msg->secblob_len;
954
955 rc = SMB2_sess_sendreceive(sess_data);
956 if (rc)
957 goto out_put_spnego_key;
958
959 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
31473fc4 960 ses->Suid = rsp->hdr.sync_hdr.SessionId;
3baf1a7b
SP		 961
962 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
3baf1a7b
SP		 963
964 rc = SMB2_sess_establish_session(sess_data);
965out_put_spnego_key:
966 key_invalidate(spnego_key);
967 key_put(spnego_key);
968out:
969 sess_data->result = rc;
970 sess_data->func = NULL;
971 SMB2_sess_free_buffer(sess_data);
972}
973#else
974static void
975SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
976{
977 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
978 sess_data->result = -EOPNOTSUPP;
979 sess_data->func = NULL;
980}
981#endif
982
166cea4d
SP		 983static void
984SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
985
986static void
987SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
5478f9ba 988{
166cea4d
SP		 989 int rc;
990 struct cifs_ses *ses = sess_data->ses;
5478f9ba 991 struct smb2_sess_setup_rsp *rsp = NULL;
166cea4d 992 char *ntlmssp_blob = NULL;
5478f9ba 993 bool use_spnego = false; /* else use raw ntlmssp */
166cea4d 994 u16 blob_length = 0;
d4e63bd6 995
5478f9ba
PS		 996 /*
997 * If memory allocation is successful, caller of this function
998 * frees it.
999 */
1000 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
166cea4d
SP		 1001 if (!ses->ntlmssp) {
1002 rc = -ENOMEM;
1003 goto out_err;
1004 }
5c234aa5 1005 ses->ntlmssp->sesskey_per_smbsess = true;
5478f9ba 1006
166cea4d 1007 rc = SMB2_sess_alloc_buffer(sess_data);
5478f9ba 1008 if (rc)
166cea4d 1009 goto out_err;
5478f9ba 1010
166cea4d
SP		 1011 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1012 GFP_KERNEL);
1013 if (ntlmssp_blob == NULL) {
1014 rc = -ENOMEM;
1015 goto out;
1016 }
c2afb814 1017
166cea4d
SP		 1018 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1019 if (use_spnego) {
1020 /* BB eventually need to add this */
1021 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1022 rc = -EOPNOTSUPP;
1023 goto out;
1024 } else {
1025 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1026 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1027 }
1028 sess_data->iov[1].iov_base = ntlmssp_blob;
1029 sess_data->iov[1].iov_len = blob_length;
c2afb814 1030
166cea4d
SP		 1031 rc = SMB2_sess_sendreceive(sess_data);
1032 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
5478f9ba 1033
166cea4d
SP		 1034 /* If true, rc here is expected and not an error */
1035 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
31473fc4 1036 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
166cea4d 1037 rc = 0;
38d77c50 1038
166cea4d
SP		 1039 if (rc)
1040 goto out;
5478f9ba 1041
166cea4d
SP		 1042 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
1043 le16_to_cpu(rsp->SecurityBufferOffset)) {
1044 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1045 le16_to_cpu(rsp->SecurityBufferOffset));
5478f9ba 1046 rc = -EIO;
166cea4d 1047 goto out;
5478f9ba 1048 }
166cea4d
SP		 1049 rc = decode_ntlmssp_challenge(rsp->Buffer,
1050 le16_to_cpu(rsp->SecurityBufferLength), ses);
1051 if (rc)
1052 goto out;
5478f9ba 1053
166cea4d 1054 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
5478f9ba 1055
5478f9ba 1056
31473fc4 1057 ses->Suid = rsp->hdr.sync_hdr.SessionId;
166cea4d 1058 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
166cea4d
SP		 1059
1060out:
1061 kfree(ntlmssp_blob);
1062 SMB2_sess_free_buffer(sess_data);
1063 if (!rc) {
1064 sess_data->result = 0;
1065 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1066 return;
1067 }
1068out_err:
1069 kfree(ses->ntlmssp);
1070 ses->ntlmssp = NULL;
1071 sess_data->result = rc;
1072 sess_data->func = NULL;
1073}
5478f9ba 1074
166cea4d
SP		 1075static void
1076SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1077{
1078 int rc;
1079 struct cifs_ses *ses = sess_data->ses;
1080 struct smb2_sess_setup_req *req;
1081 struct smb2_sess_setup_rsp *rsp = NULL;
1082 unsigned char *ntlmssp_blob = NULL;
1083 bool use_spnego = false; /* else use raw ntlmssp */
1084 u16 blob_length = 0;
5478f9ba 1085
166cea4d
SP		 1086 rc = SMB2_sess_alloc_buffer(sess_data);
1087 if (rc)
1088 goto out;
5478f9ba 1089
166cea4d 1090 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
31473fc4 1091 req->hdr.sync_hdr.SessionId = ses->Suid;
166cea4d
SP		 1092
1093 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1094 sess_data->nls_cp);
1095 if (rc) {
1096 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1097 goto out;
5478f9ba
PS		 1098 }
1099
166cea4d
SP		 1100 if (use_spnego) {
1101 /* BB eventually need to add this */
1102 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1103 rc = -EOPNOTSUPP;
1104 goto out;
1105 }
1106 sess_data->iov[1].iov_base = ntlmssp_blob;
1107 sess_data->iov[1].iov_len = blob_length;
5478f9ba 1108
166cea4d
SP		 1109 rc = SMB2_sess_sendreceive(sess_data);
1110 if (rc)
1111 goto out;
1112
1113 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1114
31473fc4 1115 ses->Suid = rsp->hdr.sync_hdr.SessionId;
5478f9ba 1116 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
5478f9ba 1117
166cea4d
SP		 1118 rc = SMB2_sess_establish_session(sess_data);
1119out:
1120 kfree(ntlmssp_blob);
1121 SMB2_sess_free_buffer(sess_data);
1122 kfree(ses->ntlmssp);
1123 ses->ntlmssp = NULL;
1124 sess_data->result = rc;
1125 sess_data->func = NULL;
1126}
d4e63bd6 1127
166cea4d
SP		 1128static int
1129SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1130{
ef65aaed
SP		 1131 int type;
1132
1133 type = smb2_select_sectype(ses->server, ses->sectype);
1134 cifs_dbg(FYI, "sess setup type %d\n", type);
1135 if (type == Unspecified) {
1136 cifs_dbg(VFS,
1137 "Unable to select appropriate authentication method!");
1138 return -EINVAL;
1139 }
d4e63bd6 1140
ef65aaed 1141 switch (type) {
166cea4d
SP		 1142 case Kerberos:
1143 sess_data->func = SMB2_auth_kerberos;
1144 break;
1145 case RawNTLMSSP:
1146 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1147 break;
1148 default:
ef65aaed 1149 cifs_dbg(VFS, "secType %d not supported!\n", type);
166cea4d 1150 return -EOPNOTSUPP;
d4e63bd6
SP		 1151 }
1152
166cea4d
SP		 1153 return 0;
1154}
1155
1156int
1157SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1158 const struct nls_table *nls_cp)
1159{
1160 int rc = 0;
1161 struct TCP_Server_Info *server = ses->server;
1162 struct SMB2_sess_data *sess_data;
1163
1164 cifs_dbg(FYI, "Session Setup\n");
1165
1166 if (!server) {
1167 WARN(1, "%s: server is NULL!\n", __func__);
1168 return -EIO;
d4e63bd6 1169 }
d4e63bd6 1170
166cea4d
SP		 1171 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1172 if (!sess_data)
1173 return -ENOMEM;
1174
1175 rc = SMB2_select_sec(ses, sess_data);
1176 if (rc)
1177 goto out;
1178 sess_data->xid = xid;
1179 sess_data->ses = ses;
1180 sess_data->buf0_type = CIFS_NO_BUFFER;
1181 sess_data->nls_cp = (struct nls_table *) nls_cp;
1182
1183 while (sess_data->func)
1184 sess_data->func(sess_data);
1185
c721c389
SF		 1186 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1187 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
3baf1a7b 1188 rc = sess_data->result;
166cea4d 1189out:
3baf1a7b 1190 kfree(sess_data);
5478f9ba
PS		 1191 return rc;
1192}
1193
1194int
1195SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1196{
1197 struct smb2_logoff_req *req; /* response is also trivial struct */
1198 int rc = 0;
1199 struct TCP_Server_Info *server;
7fb8986e 1200 int flags = 0;
5478f9ba 1201
f96637be 1202 cifs_dbg(FYI, "disconnect session %p\n", ses);
5478f9ba
PS		 1203
1204 if (ses && (ses->server))
1205 server = ses->server;
1206 else
1207 return -EIO;
1208
eb4c7df6
SP		 1209 /* no need to send SMB logoff if uid already closed due to reconnect */
1210 if (ses->need_reconnect)
1211 goto smb2_session_already_dead;
1212
5478f9ba
PS		 1213 rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1214 if (rc)
1215 return rc;
1216
1217 /* since no tcon, smb2_init can not do this, so do here */
31473fc4 1218 req->hdr.sync_hdr.SessionId = ses->Suid;
7fb8986e
PS		 1219
1220 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1221 flags |= CIFS_TRANSFORM_REQ;
1222 else if (server->sign)
31473fc4 1223 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
5478f9ba 1224
7fb8986e 1225 rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
da502f7d 1226 cifs_small_buf_release(req);
5478f9ba
PS		 1227 /*
1228 * No tcon so can't do
1229 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1230 */
eb4c7df6
SP		 1231
1232smb2_session_already_dead:
5478f9ba
PS		 1233 return rc;
1234}
faaf946a
PS		 1235
1236static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1237{
d60622eb 1238 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
faaf946a
PS		 1239}
1240
1241#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1242
de9f68df
SF		 1243/* These are similar values to what Windows uses */
1244static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1245{
1246 tcon->max_chunks = 256;
1247 tcon->max_bytes_chunk = 1048576;
1248 tcon->max_bytes_copy = 16777216;
1249}
1250
faaf946a
PS		 1251int
1252SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1253 struct cifs_tcon *tcon, const struct nls_table *cp)
1254{
1255 struct smb2_tree_connect_req *req;
1256 struct smb2_tree_connect_rsp *rsp = NULL;
1257 struct kvec iov[2];
db3b5474 1258 struct kvec rsp_iov = { NULL, 0 };
faaf946a
PS		 1259 int rc = 0;
1260 int resp_buftype;
1261 int unc_path_len;
faaf946a 1262 __le16 *unc_path = NULL;
7fb8986e 1263 int flags = 0;
faaf946a 1264
f96637be 1265 cifs_dbg(FYI, "TCON\n");
faaf946a 1266
68a6afa7 1267 if (!(ses->server) || !tree)
faaf946a
PS		 1268 return -EIO;
1269
faaf946a
PS		 1270 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1271 if (unc_path == NULL)
1272 return -ENOMEM;
1273
1274 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1275 unc_path_len *= 2;
1276 if (unc_path_len < 2) {
1277 kfree(unc_path);
1278 return -EINVAL;
1279 }
1280
806a28ef
JMG		 1281 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1282 if (tcon)
1283 tcon->tid = 0;
1284
faaf946a
PS		 1285 rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1286 if (rc) {
1287 kfree(unc_path);
1288 return rc;
1289 }
1290
1291 if (tcon == NULL) {
ae6f8dd4
PS		 1292 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1293 flags |= CIFS_TRANSFORM_REQ;
1294
faaf946a 1295 /* since no tcon, smb2_init can not do this, so do here */
31473fc4 1296 req->hdr.sync_hdr.SessionId = ses->Suid;
b9043cc5
AA		 1297 if (ses->server->sign)
1298 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
ae6f8dd4
PS		 1299 } else if (encryption_required(tcon))
1300 flags |= CIFS_TRANSFORM_REQ;
faaf946a
PS		 1301
1302 iov[0].iov_base = (char *)req;
1303 /* 4 for rfc1002 length field and 1 for pad */
1304 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1305
1306 /* Testing shows that buffer offset must be at location of Buffer[0] */
1307 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1308 - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1309 req->PathLength = cpu_to_le16(unc_path_len - 2);
1310 iov[1].iov_base = unc_path;
1311 iov[1].iov_len = unc_path_len;
1312
1313 inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1314
7fb8986e 1315 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 1316 cifs_small_buf_release(req);
1317 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
faaf946a
PS		 1318
1319 if (rc != 0) {
1320 if (tcon) {
1321 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1322 tcon->need_reconnect = true;
1323 }
1324 goto tcon_error_exit;
1325 }
1326
faaf946a 1327 if (tcon == NULL) {
31473fc4 1328 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
faaf946a
PS		 1329 goto tcon_exit;
1330 }
1331
cd123007
CJ		 1332 switch (rsp->ShareType) {
1333 case SMB2_SHARE_TYPE_DISK:
f96637be 1334 cifs_dbg(FYI, "connection to disk share\n");
cd123007
CJ		 1335 break;
1336 case SMB2_SHARE_TYPE_PIPE:
faaf946a 1337 tcon->ipc = true;
f96637be 1338 cifs_dbg(FYI, "connection to pipe share\n");
cd123007
CJ		 1339 break;
1340 case SMB2_SHARE_TYPE_PRINT:
1341 tcon->ipc = true;
f96637be 1342 cifs_dbg(FYI, "connection to printer\n");
cd123007
CJ		 1343 break;
1344 default:
f96637be 1345 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
faaf946a
PS		 1346 rc = -EOPNOTSUPP;
1347 goto tcon_error_exit;
1348 }
1349
1350 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
769ee6a4 1351 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
faaf946a
PS		 1352 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1353 tcon->tidStatus = CifsGood;
1354 tcon->need_reconnect = false;
31473fc4 1355 tcon->tid = rsp->hdr.sync_hdr.TreeId;
46b51d08 1356 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
faaf946a
PS		 1357
1358 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1359 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
f96637be 1360 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
ae6f8dd4
PS		 1361
1362 if (tcon->seal &&
1363 !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1364 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1365
de9f68df 1366 init_copy_chunk_defaults(tcon);
ff1c038a
SF		 1367 if (tcon->ses->server->ops->validate_negotiate)
1368 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
faaf946a
PS		 1369tcon_exit:
1370 free_rsp_buf(resp_buftype, rsp);
1371 kfree(unc_path);
1372 return rc;
1373
1374tcon_error_exit:
db3b5474 1375 if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
f96637be 1376 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
faaf946a
PS		 1377 }
1378 goto tcon_exit;
1379}
1380
1381int
1382SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1383{
1384 struct smb2_tree_disconnect_req *req; /* response is trivial */
1385 int rc = 0;
faaf946a 1386 struct cifs_ses *ses = tcon->ses;
7fb8986e 1387 int flags = 0;
faaf946a 1388
f96637be 1389 cifs_dbg(FYI, "Tree Disconnect\n");
faaf946a 1390
68a6afa7 1391 if (!ses || !(ses->server))
faaf946a
PS		 1392 return -EIO;
1393
1394 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1395 return 0;
1396
1397 rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1398 if (rc)
1399 return rc;
1400
7fb8986e
PS		 1401 if (encryption_required(tcon))
1402 flags |= CIFS_TRANSFORM_REQ;
1403
1404 rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
da502f7d 1405 cifs_small_buf_release(req);
faaf946a
PS		 1406 if (rc)
1407 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1408
1409 return rc;
1410}
2503a0db 1411
b8c32dbb 1412
63eb3def
PS		 1413static struct create_durable *
1414create_durable_buf(void)
1415{
1416 struct create_durable *buf;
1417
1418 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1419 if (!buf)
1420 return NULL;
1421
1422 buf->ccontext.DataOffset = cpu_to_le16(offsetof
9cbc0b73 1423 (struct create_durable, Data));
63eb3def
PS		 1424 buf->ccontext.DataLength = cpu_to_le32(16);
1425 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1426 (struct create_durable, Name));
1427 buf->ccontext.NameLength = cpu_to_le16(4);
12197a7f 1428 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
63eb3def
PS		 1429 buf->Name[0] = 'D';
1430 buf->Name[1] = 'H';
1431 buf->Name[2] = 'n';
1432 buf->Name[3] = 'Q';
1433 return buf;
1434}
1435
9cbc0b73
PS		 1436static struct create_durable *
1437create_reconnect_durable_buf(struct cifs_fid *fid)
1438{
1439 struct create_durable *buf;
1440
1441 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1442 if (!buf)
1443 return NULL;
1444
1445 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1446 (struct create_durable, Data));
1447 buf->ccontext.DataLength = cpu_to_le32(16);
1448 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1449 (struct create_durable, Name));
1450 buf->ccontext.NameLength = cpu_to_le16(4);
1451 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1452 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
12197a7f 1453 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
9cbc0b73
PS		 1454 buf->Name[0] = 'D';
1455 buf->Name[1] = 'H';
1456 buf->Name[2] = 'n';
1457 buf->Name[3] = 'C';
1458 return buf;
1459}
1460
b8c32dbb 1461static __u8
42873b0a
PS		 1462parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1463 unsigned int *epoch)
b8c32dbb
PS		 1464{
1465 char *data_offset;
b5c7cde3 1466 struct create_context *cc;
deb7deff
JM		 1467 unsigned int next;
1468 unsigned int remaining;
fd554396 1469 char *name;
b8c32dbb 1470
fd554396 1471 data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
deb7deff 1472 remaining = le32_to_cpu(rsp->CreateContextsLength);
b5c7cde3 1473 cc = (struct create_context *)data_offset;
deb7deff 1474 while (remaining >= sizeof(struct create_context)) {
b5c7cde3 1475 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
deb7deff
JM		 1476 if (le16_to_cpu(cc->NameLength) == 4 &&
1477 strncmp(name, "RqLs", 4) == 0)
1478 return server->ops->parse_lease_buf(cc, epoch);
1479
1480 next = le32_to_cpu(cc->Next);
1481 if (!next)
1482 break;
1483 remaining -= next;
1484 cc = (struct create_context *)((char *)cc + next);
1485 }
b8c32dbb 1486
b5c7cde3 1487 return 0;
b8c32dbb
PS		 1488}
1489
d22cbfec 1490static int
a41a28bd
PS		 1491add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1492 unsigned int *num_iovec, __u8 *oplock)
d22cbfec
PS		 1493{
1494 struct smb2_create_req *req = iov[0].iov_base;
1495 unsigned int num = *num_iovec;
1496
a41a28bd 1497 iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
d22cbfec
PS		 1498 if (iov[num].iov_base == NULL)
1499 return -ENOMEM;
a41a28bd 1500 iov[num].iov_len = server->vals->create_lease_size;
d22cbfec
PS		 1501 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1502 if (!req->CreateContextsOffset)
1503 req->CreateContextsOffset = cpu_to_le32(
1504 sizeof(struct smb2_create_req) - 4 +
1505 iov[num - 1].iov_len);
a41a28bd
PS		 1506 le32_add_cpu(&req->CreateContextsLength,
1507 server->vals->create_lease_size);
1508 inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
d22cbfec
PS		 1509 *num_iovec = num + 1;
1510 return 0;
1511}
1512
b56eae4d
SF		 1513static struct create_durable_v2 *
1514create_durable_v2_buf(struct cifs_fid *pfid)
1515{
1516 struct create_durable_v2 *buf;
1517
1518 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1519 if (!buf)
1520 return NULL;
1521
1522 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1523 (struct create_durable_v2, dcontext));
1524 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1525 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1526 (struct create_durable_v2, Name));
1527 buf->ccontext.NameLength = cpu_to_le16(4);
1528
1529 buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1530 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
fa70b87c 1531 generate_random_uuid(buf->dcontext.CreateGuid);
b56eae4d
SF		 1532 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1533
1534 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1535 buf->Name[0] = 'D';
1536 buf->Name[1] = 'H';
1537 buf->Name[2] = '2';
1538 buf->Name[3] = 'Q';
1539 return buf;
1540}
1541
1542static struct create_durable_handle_reconnect_v2 *
1543create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1544{
1545 struct create_durable_handle_reconnect_v2 *buf;
1546
1547 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1548 GFP_KERNEL);
1549 if (!buf)
1550 return NULL;
1551
1552 buf->ccontext.DataOffset =
1553 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1554 dcontext));
1555 buf->ccontext.DataLength =
1556 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1557 buf->ccontext.NameOffset =
1558 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1559 Name));
1560 buf->ccontext.NameLength = cpu_to_le16(4);
1561
1562 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1563 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1564 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1565 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1566
1567 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1568 buf->Name[0] = 'D';
1569 buf->Name[1] = 'H';
1570 buf->Name[2] = '2';
1571 buf->Name[3] = 'C';
1572 return buf;
1573}
1574
63eb3def 1575static int
b56eae4d
SF		 1576add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1577 struct cifs_open_parms *oparms)
1578{
1579 struct smb2_create_req *req = iov[0].iov_base;
1580 unsigned int num = *num_iovec;
1581
1582 iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1583 if (iov[num].iov_base == NULL)
1584 return -ENOMEM;
1585 iov[num].iov_len = sizeof(struct create_durable_v2);
1586 if (!req->CreateContextsOffset)
1587 req->CreateContextsOffset =
1588 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1589 iov[1].iov_len);
1590 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1591 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1592 *num_iovec = num + 1;
1593 return 0;
1594}
1595
1596static int
1597add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
9cbc0b73 1598 struct cifs_open_parms *oparms)
63eb3def
PS		 1599{
1600 struct smb2_create_req *req = iov[0].iov_base;
1601 unsigned int num = *num_iovec;
1602
b56eae4d
SF		 1603 /* indicate that we don't need to relock the file */
1604 oparms->reconnect = false;
1605
1606 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1607 if (iov[num].iov_base == NULL)
1608 return -ENOMEM;
1609 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1610 if (!req->CreateContextsOffset)
1611 req->CreateContextsOffset =
1612 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1613 iov[1].iov_len);
1614 le32_add_cpu(&req->CreateContextsLength,
1615 sizeof(struct create_durable_handle_reconnect_v2));
1616 inc_rfc1001_len(&req->hdr,
1617 sizeof(struct create_durable_handle_reconnect_v2));
1618 *num_iovec = num + 1;
1619 return 0;
1620}
1621
1622static int
1623add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1624 struct cifs_open_parms *oparms, bool use_persistent)
1625{
1626 struct smb2_create_req *req = iov[0].iov_base;
1627 unsigned int num = *num_iovec;
1628
1629 if (use_persistent) {
1630 if (oparms->reconnect)
1631 return add_durable_reconnect_v2_context(iov, num_iovec,
1632 oparms);
1633 else
1634 return add_durable_v2_context(iov, num_iovec, oparms);
1635 }
1636
9cbc0b73
PS		 1637 if (oparms->reconnect) {
1638 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1639 /* indicate that we don't need to relock the file */
1640 oparms->reconnect = false;
1641 } else
1642 iov[num].iov_base = create_durable_buf();
63eb3def
PS		 1643 if (iov[num].iov_base == NULL)
1644 return -ENOMEM;
1645 iov[num].iov_len = sizeof(struct create_durable);
1646 if (!req->CreateContextsOffset)
1647 req->CreateContextsOffset =
1648 cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1649 iov[1].iov_len);
31f92e9a 1650 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
63eb3def
PS		 1651 inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1652 *num_iovec = num + 1;
1653 return 0;
1654}
1655
f0712928
AA		 1656static int
1657alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1658 const char *treename, const __le16 *path)
1659{
1660 int treename_len, path_len;
1661 struct nls_table *cp;
1662 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1663
1664 /*
1665 * skip leading "\\"
1666 */
1667 treename_len = strlen(treename);
1668 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1669 return -EINVAL;
1670
1671 treename += 2;
1672 treename_len -= 2;
1673
1674 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1675
1676 /*
1677 * make room for one path separator between the treename and
1678 * path
1679 */
1680 *out_len = treename_len + 1 + path_len;
1681
1682 /*
1683 * final path needs to be null-terminated UTF16 with a
1684 * size aligned to 8
1685 */
1686
1687 *out_size = roundup((*out_len+1)*2, 8);
1688 *out_path = kzalloc(*out_size, GFP_KERNEL);
1689 if (!*out_path)
1690 return -ENOMEM;
1691
1692 cp = load_nls_default();
1693 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1694 UniStrcat(*out_path, sep);
1695 UniStrcat(*out_path, path);
1696 unload_nls(cp);
1697
1698 return 0;
1699}
1700
2503a0db 1701int
064f6047 1702SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
b42bf888
PS		 1703 __u8 *oplock, struct smb2_file_all_info *buf,
1704 struct smb2_err_rsp **err_buf)
2503a0db
PS		 1705{
1706 struct smb2_create_req *req;
1707 struct smb2_create_rsp *rsp;
1708 struct TCP_Server_Info *server;
064f6047 1709 struct cifs_tcon *tcon = oparms->tcon;
2503a0db 1710 struct cifs_ses *ses = tcon->ses;
63eb3def 1711 struct kvec iov[4];
bf2afee1 1712 struct kvec rsp_iov = {NULL, 0};
2503a0db
PS		 1713 int resp_buftype;
1714 int uni_path_len;
b8c32dbb
PS		 1715 __le16 *copy_path = NULL;
1716 int copy_size;
2503a0db 1717 int rc = 0;
da502f7d 1718 unsigned int n_iov = 2;
ca81983f 1719 __u32 file_attributes = 0;
663a9621 1720 char *dhc_buf = NULL, *lc_buf = NULL;
7fb8986e 1721 int flags = 0;
2503a0db 1722
f96637be 1723 cifs_dbg(FYI, "create/open\n");
2503a0db
PS		 1724
1725 if (ses && (ses->server))
1726 server = ses->server;
1727 else
1728 return -EIO;
1729
1730 rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1731 if (rc)
1732 return rc;
1733
7fb8986e
PS		 1734 if (encryption_required(tcon))
1735 flags |= CIFS_TRANSFORM_REQ;
1736
064f6047 1737 if (oparms->create_options & CREATE_OPTION_READONLY)
ca81983f 1738 file_attributes |= ATTR_READONLY;
db8b631d
SF		 1739 if (oparms->create_options & CREATE_OPTION_SPECIAL)
1740 file_attributes |= ATTR_SYSTEM;
ca81983f 1741
2503a0db 1742 req->ImpersonationLevel = IL_IMPERSONATION;
064f6047 1743 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2503a0db
PS		 1744 /* File attributes ignored on open (used in create though) */
1745 req->FileAttributes = cpu_to_le32(file_attributes);
1746 req->ShareAccess = FILE_SHARE_ALL_LE;
064f6047
PS		 1747 req->CreateDisposition = cpu_to_le32(oparms->disposition);
1748 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2503a0db
PS		 1749
1750 iov[0].iov_base = (char *)req;
1751 /* 4 for rfc1002 length field */
1752 iov[0].iov_len = get_rfc1002_length(req) + 4;
59aa3718
PS		 1753 /* -1 since last byte is buf[0] which is sent below (path) */
1754 iov[0].iov_len--;
f0712928
AA		 1755
1756 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1757
1758 /* [MS-SMB2] 2.2.13 NameOffset:
1759 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1760 * the SMB2 header, the file name includes a prefix that will
1761 * be processed during DFS name normalization as specified in
1762 * section 3.3.5.9. Otherwise, the file name is relative to
1763 * the share that is identified by the TreeId in the SMB2
1764 * header.
1765 */
1766 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1767 int name_len;
1768
1769 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1770 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1771 &name_len,
1772 tcon->treeName, path);
1773 if (rc)
1774 return rc;
1775 req->NameLength = cpu_to_le16(name_len * 2);
59aa3718
PS		 1776 uni_path_len = copy_size;
1777 path = copy_path;
f0712928
AA		 1778 } else {
1779 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1780 /* MUST set path len (NameLength) to 0 opening root of share */
1781 req->NameLength = cpu_to_le16(uni_path_len - 2);
1782 if (uni_path_len % 8 != 0) {
1783 copy_size = roundup(uni_path_len, 8);
1784 copy_path = kzalloc(copy_size, GFP_KERNEL);
1785 if (!copy_path)
1786 return -ENOMEM;
1787 memcpy((char *)copy_path, (const char *)path,
1788 uni_path_len);
1789 uni_path_len = copy_size;
1790 path = copy_path;
1791 }
2503a0db
PS		 1792 }
1793
59aa3718
PS		 1794 iov[1].iov_len = uni_path_len;
1795 iov[1].iov_base = path;
1796 /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1797 inc_rfc1001_len(req, uni_path_len - 1);
1798
b8c32dbb
PS		 1799 if (!server->oplocks)
1800 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1801
a41a28bd 1802 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
b8c32dbb
PS		 1803 *oplock == SMB2_OPLOCK_LEVEL_NONE)
1804 req->RequestedOplockLevel = *oplock;
1805 else {
da502f7d 1806 rc = add_lease_context(server, iov, &n_iov, oplock);
d22cbfec 1807 if (rc) {
b8c32dbb
PS		 1808 cifs_small_buf_release(req);
1809 kfree(copy_path);
d22cbfec 1810 return rc;
b8c32dbb 1811 }
da502f7d 1812 lc_buf = iov[n_iov-1].iov_base;
b8c32dbb
PS		 1813 }
1814
63eb3def
PS		 1815 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1816 /* need to set Next field of lease context if we request it */
a41a28bd 1817 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
63eb3def 1818 struct create_context *ccontext =
da502f7d 1819 (struct create_context *)iov[n_iov-1].iov_base;
1c46943f 1820 ccontext->Next =
a41a28bd 1821 cpu_to_le32(server->vals->create_lease_size);
63eb3def 1822 }
b56eae4d 1823
da502f7d 1824 rc = add_durable_context(iov, &n_iov, oparms,
b56eae4d 1825 tcon->use_persistent);
63eb3def
PS		 1826 if (rc) {
1827 cifs_small_buf_release(req);
1828 kfree(copy_path);
663a9621 1829 kfree(lc_buf);
63eb3def
PS		 1830 return rc;
1831 }
da502f7d 1832 dhc_buf = iov[n_iov-1].iov_base;
63eb3def
PS		 1833 }
1834
7fb8986e 1835 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 1836 cifs_small_buf_release(req);
1837 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2503a0db
PS		 1838
1839 if (rc != 0) {
1840 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
bf2afee1 1841 if (err_buf && rsp)
b42bf888
PS		 1842 *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1843 GFP_KERNEL);
2503a0db
PS		 1844 goto creat_exit;
1845 }
1846
064f6047
PS		 1847 oparms->fid->persistent_fid = rsp->PersistentFileId;
1848 oparms->fid->volatile_fid = rsp->VolatileFileId;
f0df737e
PS		 1849
1850 if (buf) {
1851 memcpy(buf, &rsp->CreationTime, 32);
1852 buf->AllocationSize = rsp->AllocationSize;
1853 buf->EndOfFile = rsp->EndofFile;
1854 buf->Attributes = rsp->FileAttributes;
1855 buf->NumberOfLinks = cpu_to_le32(1);
1856 buf->DeletePending = 0;
1857 }
2e44b288 1858
b8c32dbb 1859 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
42873b0a 1860 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
b8c32dbb
PS		 1861 else
1862 *oplock = rsp->OplockLevel;
2503a0db 1863creat_exit:
b8c32dbb 1864 kfree(copy_path);
663a9621
PS		 1865 kfree(lc_buf);
1866 kfree(dhc_buf);
2503a0db
PS		 1867 free_rsp_buf(resp_buftype, rsp);
1868 return rc;
1869}
1870
4a72dafa
SF		 1871/*
1872 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
1873 */
1874int
1875SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
51146625
AA		 1876 u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1877 char *in_data, u32 indatalen,
1878 char **out_data, u32 *plen /* returned data len */)
4a72dafa
SF		 1879{
1880 struct smb2_ioctl_req *req;
1881 struct smb2_ioctl_rsp *rsp;
31473fc4 1882 struct smb2_sync_hdr *shdr;
8e353106 1883 struct cifs_ses *ses;
4a72dafa 1884 struct kvec iov[2];
da502f7d 1885 struct kvec rsp_iov;
4a72dafa 1886 int resp_buftype;
da502f7d 1887 int n_iov;
4a72dafa 1888 int rc = 0;
7fb8986e 1889 int flags = 0;
4a72dafa
SF		 1890
1891 cifs_dbg(FYI, "SMB2 IOCTL\n");
1892
3d1a3745
SF		 1893 if (out_data != NULL)
1894 *out_data = NULL;
1895
4a72dafa
SF		 1896 /* zero out returned data len, in case of error */
1897 if (plen)
1898 *plen = 0;
1899
8e353106
SF		 1900 if (tcon)
1901 ses = tcon->ses;
1902 else
1903 return -EIO;
1904
68a6afa7 1905 if (!ses || !(ses->server))
4a72dafa
SF		 1906 return -EIO;
1907
1908 rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1909 if (rc)
1910 return rc;
1911
51146625
AA		 1912 if (use_ipc) {
1913 if (ses->ipc_tid == 0) {
1914 cifs_small_buf_release(req);
1915 return -ENOTCONN;
1916 }
1917
1918 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1919 req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1920 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1921 }
7fb8986e
PS		 1922 if (encryption_required(tcon))
1923 flags |= CIFS_TRANSFORM_REQ;
1924
4a72dafa
SF		 1925 req->CtlCode = cpu_to_le32(opcode);
1926 req->PersistentFileId = persistent_fid;
1927 req->VolatileFileId = volatile_fid;
1928
1929 if (indatalen) {
1930 req->InputCount = cpu_to_le32(indatalen);
1931 /* do not set InputOffset if no input data */
1932 req->InputOffset =
1933 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1934 iov[1].iov_base = in_data;
1935 iov[1].iov_len = indatalen;
da502f7d 1936 n_iov = 2;
4a72dafa 1937 } else
da502f7d 1938 n_iov = 1;
4a72dafa
SF		 1939
1940 req->OutputOffset = 0;
1941 req->OutputCount = 0; /* MBZ */
1942
1943 /*
1944 * Could increase MaxOutputResponse, but that would require more
1945 * than one credit. Windows typically sets this smaller, but for some
1946 * ioctls it may be useful to allow server to send more. No point
1947 * limiting what the server can send as long as fits in one credit
7db0a6ef
SF		 1948 * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1949 * (by default, note that it can be overridden to make max larger)
1950 * in responses (except for read responses which can be bigger.
1951 * We may want to bump this limit up
4a72dafa 1952 */
7db0a6ef 1953 req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
4a72dafa
SF		 1954
1955 if (is_fsctl)
1956 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1957 else
1958 req->Flags = 0;
1959
1960 iov[0].iov_base = (char *)req;
4a72dafa 1961
7ff8d45c
SF		 1962 /*
1963 * If no input data, the size of ioctl struct in
1964 * protocol spec still includes a 1 byte data buffer,
1965 * but if input data passed to ioctl, we do not
1966 * want to double count this, so we do not send
1967 * the dummy one byte of data in iovec[0] if sending
1968 * input data (in iovec[1]). We also must add 4 bytes
1969 * in first iovec to allow for rfc1002 length field.
1970 */
1971
1972 if (indatalen) {
1973 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1974 inc_rfc1001_len(req, indatalen - 1);
1975 } else
1976 iov[0].iov_len = get_rfc1002_length(req) + 4;
1977
4a72dafa 1978
7fb8986e 1979 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 1980 cifs_small_buf_release(req);
1981 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
4a72dafa 1982
9bf0c9cd 1983 if ((rc != 0) && (rc != -EINVAL)) {
8e353106 1984 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
4a72dafa 1985 goto ioctl_exit;
9bf0c9cd
SF		 1986 } else if (rc == -EINVAL) {
1987 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1988 (opcode != FSCTL_SRV_COPYCHUNK)) {
8e353106 1989 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
9bf0c9cd
SF		 1990 goto ioctl_exit;
1991 }
4a72dafa
SF		 1992 }
1993
1994 /* check if caller wants to look at return data or just return rc */
1995 if ((plen == NULL) || (out_data == NULL))
1996 goto ioctl_exit;
1997
1998 *plen = le32_to_cpu(rsp->OutputCount);
1999
2000 /* We check for obvious errors in the output buffer length and offset */
2001 if (*plen == 0)
2002 goto ioctl_exit; /* server returned no data */
2003 else if (*plen > 0xFF00) {
2004 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2005 *plen = 0;
2006 rc = -EIO;
2007 goto ioctl_exit;
2008 }
2009
2010 if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
2011 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2012 le32_to_cpu(rsp->OutputOffset));
2013 *plen = 0;
2014 rc = -EIO;
2015 goto ioctl_exit;
2016 }
2017
2018 *out_data = kmalloc(*plen, GFP_KERNEL);
2019 if (*out_data == NULL) {
2020 rc = -ENOMEM;
2021 goto ioctl_exit;
2022 }
2023
31473fc4
PS		 2024 shdr = get_sync_hdr(rsp);
2025 memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
4a72dafa
SF		 2026ioctl_exit:
2027 free_rsp_buf(resp_buftype, rsp);
2028 return rc;
2029}
2030
64a5cfa6
SF		 2031/*
2032 * Individual callers to ioctl worker function follow
2033 */
2034
2035int
2036SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2037 u64 persistent_fid, u64 volatile_fid)
2038{
2039 int rc;
64a5cfa6
SF		 2040 struct compress_ioctl fsctl_input;
2041 char *ret_data = NULL;
2042
2043 fsctl_input.CompressionState =
bc09d141 2044 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
64a5cfa6
SF		 2045
2046 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2047 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
51146625 2048 false /* use_ipc */,
64a5cfa6
SF		 2049 (char *)&fsctl_input /* data input */,
2050 2 /* in data len */, &ret_data /* out data */, NULL);
2051
2052 cifs_dbg(FYI, "set compression rc %d\n", rc);
64a5cfa6
SF		 2053
2054 return rc;
2055}
2056
2503a0db
PS		 2057int
2058SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2059 u64 persistent_fid, u64 volatile_fid)
2060{
2061 struct smb2_close_req *req;
2062 struct smb2_close_rsp *rsp;
2503a0db
PS		 2063 struct cifs_ses *ses = tcon->ses;
2064 struct kvec iov[1];
da502f7d 2065 struct kvec rsp_iov;
2503a0db
PS		 2066 int resp_buftype;
2067 int rc = 0;
7fb8986e 2068 int flags = 0;
2503a0db 2069
f96637be 2070 cifs_dbg(FYI, "Close\n");
2503a0db 2071
68a6afa7 2072 if (!ses || !(ses->server))
2503a0db
PS		 2073 return -EIO;
2074
2075 rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
2076 if (rc)
2077 return rc;
2078
7fb8986e
PS		 2079 if (encryption_required(tcon))
2080 flags |= CIFS_TRANSFORM_REQ;
2081
2503a0db
PS		 2082 req->PersistentFileId = persistent_fid;
2083 req->VolatileFileId = volatile_fid;
2084
2085 iov[0].iov_base = (char *)req;
2086 /* 4 for rfc1002 length field */
2087 iov[0].iov_len = get_rfc1002_length(req) + 4;
2088
7fb8986e 2089 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 2090 cifs_small_buf_release(req);
2091 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2503a0db
PS		 2092
2093 if (rc != 0) {
d4a029d2 2094 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2503a0db
PS		 2095 goto close_exit;
2096 }
2097
2503a0db
PS		 2098 /* BB FIXME - decode close response, update inode for caching */
2099
2100close_exit:
2101 free_rsp_buf(resp_buftype, rsp);
2102 return rc;
2103}
be4cb9e3
PS		 2104
2105static int
2106validate_buf(unsigned int offset, unsigned int buffer_length,
2107 struct smb2_hdr *hdr, unsigned int min_buf_size)
2108
2109{
2110 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2111 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2112 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2113 char *end_of_buf = begin_of_buf + buffer_length;
2114
2115
2116 if (buffer_length < min_buf_size) {
f96637be
JP		 2117 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2118 buffer_length, min_buf_size);
be4cb9e3
PS		 2119 return -EINVAL;
2120 }
2121
2122 /* check if beyond RFC1001 maximum length */
2123 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
f96637be
JP		 2124 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2125 buffer_length, smb_len);
be4cb9e3
PS		 2126 return -EINVAL;
2127 }
2128
2129 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
f96637be 2130 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
be4cb9e3
PS		 2131 return -EINVAL;
2132 }
2133
2134 return 0;
2135}
2136
2137/*
2138 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2139 * Caller must free buffer.
2140 */
2141static int
2142validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2143 struct smb2_hdr *hdr, unsigned int minbufsize,
2144 char *data)
2145
2146{
2147 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2148 int rc;
2149
2150 if (!data)
2151 return -EINVAL;
2152
2153 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2154 if (rc)
2155 return rc;
2156
2157 memcpy(data, begin_of_buf, buffer_length);
2158
2159 return 0;
2160}
2161
f0df737e
PS		 2162static int
2163query_info(const unsigned int xid, struct cifs_tcon *tcon,
42c493c1
SP		 2164 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2165 u32 additional_info, size_t output_len, size_t min_len, void **data,
2166 u32 *dlen)
be4cb9e3
PS		 2167{
2168 struct smb2_query_info_req *req;
2169 struct smb2_query_info_rsp *rsp = NULL;
2170 struct kvec iov[2];
da502f7d 2171 struct kvec rsp_iov;
be4cb9e3
PS		 2172 int rc = 0;
2173 int resp_buftype;
be4cb9e3 2174 struct cifs_ses *ses = tcon->ses;
7fb8986e 2175 int flags = 0;
be4cb9e3 2176
f96637be 2177 cifs_dbg(FYI, "Query Info\n");
be4cb9e3 2178
68a6afa7 2179 if (!ses || !(ses->server))
be4cb9e3
PS		 2180 return -EIO;
2181
2182 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2183 if (rc)
2184 return rc;
2185
7fb8986e
PS		 2186 if (encryption_required(tcon))
2187 flags |= CIFS_TRANSFORM_REQ;
2188
42c493c1 2189 req->InfoType = info_type;
f0df737e 2190 req->FileInfoClass = info_class;
be4cb9e3
PS		 2191 req->PersistentFileId = persistent_fid;
2192 req->VolatileFileId = volatile_fid;
42c493c1 2193 req->AdditionalInformation = cpu_to_le32(additional_info);
48923d2a
AA		 2194
2195 /*
2196 * We do not use the input buffer (do not send extra byte)
2197 */
2198 req->InputBufferOffset = 0;
2199 inc_rfc1001_len(req, -1);
2200
f0df737e 2201 req->OutputBufferLength = cpu_to_le32(output_len);
be4cb9e3
PS		 2202
2203 iov[0].iov_base = (char *)req;
2204 /* 4 for rfc1002 length field */
2205 iov[0].iov_len = get_rfc1002_length(req) + 4;
2206
7fb8986e 2207 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 2208 cifs_small_buf_release(req);
2209 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
e5d04887 2210
be4cb9e3
PS		 2211 if (rc) {
2212 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2213 goto qinf_exit;
2214 }
2215
42c493c1
SP		 2216 if (dlen) {
2217 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2218 if (!*data) {
2219 *data = kmalloc(*dlen, GFP_KERNEL);
2220 if (!*data) {
2221 cifs_dbg(VFS,
2222 "Error %d allocating memory for acl\n",
2223 rc);
2224 *dlen = 0;
2225 goto qinf_exit;
2226 }
2227 }
2228 }
2229
be4cb9e3
PS		 2230 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2231 le32_to_cpu(rsp->OutputBufferLength),
42c493c1 2232 &rsp->hdr, min_len, *data);
be4cb9e3
PS		 2233
2234qinf_exit:
2235 free_rsp_buf(resp_buftype, rsp);
2236 return rc;
2237}
9094fad1 2238
95907fea 2239int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
7cb3def4
RS		 2240 u64 persistent_fid, u64 volatile_fid,
2241 int ea_buf_size, struct smb2_file_full_ea_info *data)
95907fea
RS		 2242{
2243 return query_info(xid, tcon, persistent_fid, volatile_fid,
2244 FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
7cb3def4 2245 ea_buf_size,
95907fea
RS		 2246 sizeof(struct smb2_file_full_ea_info),
2247 (void **)&data,
2248 NULL);
2249}
2250
42c493c1
SP		 2251int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2252 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2253{
2254 return query_info(xid, tcon, persistent_fid, volatile_fid,
2255 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2256 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2257 sizeof(struct smb2_file_all_info), (void **)&data,
2258 NULL);
2259}
2260
f0df737e 2261int
42c493c1 2262SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
f0df737e 2263 u64 persistent_fid, u64 volatile_fid,
42c493c1 2264 void **data, u32 *plen)
f0df737e 2265{
42c493c1
SP		 2266 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2267 *plen = 0;
2268
f0df737e 2269 return query_info(xid, tcon, persistent_fid, volatile_fid,
42c493c1
SP		 2270 0, SMB2_O_INFO_SECURITY, additional_info,
2271 SMB2_MAX_BUFFER_SIZE,
2272 sizeof(struct smb2_file_all_info), data, plen);
f0df737e
PS		 2273}
2274
2275int
2276SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2277 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2278{
2279 return query_info(xid, tcon, persistent_fid, volatile_fid,
42c493c1
SP		 2280 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2281 sizeof(struct smb2_file_internal_info),
f0df737e 2282 sizeof(struct smb2_file_internal_info),
42c493c1 2283 (void **)&uniqueid, NULL);
f0df737e
PS		 2284}
2285
9094fad1
PS		 2286/*
2287 * This is a no-op for now. We're not really interested in the reply, but
2288 * rather in the fact that the server sent one and that server->lstrp
2289 * gets updated.
2290 *
2291 * FIXME: maybe we should consider checking that the reply matches request?
2292 */
2293static void
2294smb2_echo_callback(struct mid_q_entry *mid)
2295{
2296 struct TCP_Server_Info *server = mid->callback_data;
31473fc4 2297 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
9094fad1
PS		 2298 unsigned int credits_received = 1;
2299
2300 if (mid->mid_state == MID_RESPONSE_RECEIVED)
31473fc4 2301 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
9094fad1
PS		 2302
2303 DeleteMidQEntry(mid);
2304 add_credits(server, credits_received, CIFS_ECHO_OP);
2305}
2306
53e0e11e
PS		 2307void smb2_reconnect_server(struct work_struct *work)
2308{
2309 struct TCP_Server_Info *server = container_of(work,
2310 struct TCP_Server_Info, reconnect.work);
2311 struct cifs_ses *ses;
2312 struct cifs_tcon *tcon, *tcon2;
2313 struct list_head tmp_list;
2314 int tcon_exist = false;
18ea4311
GP		 2315 int rc;
2316 int resched = false;
2317
53e0e11e
PS		 2318
2319 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2320 mutex_lock(&server->reconnect_mutex);
2321
2322 INIT_LIST_HEAD(&tmp_list);
2323 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2324
2325 spin_lock(&cifs_tcp_ses_lock);
2326 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2327 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
96a988ff 2328 if (tcon->need_reconnect || tcon->need_reopen_files) {
53e0e11e
PS		 2329 tcon->tc_count++;
2330 list_add_tail(&tcon->rlist, &tmp_list);
2331 tcon_exist = true;
2332 }
2333 }
2334 }
2335 /*
2336 * Get the reference to server struct to be sure that the last call of
2337 * cifs_put_tcon() in the loop below won't release the server pointer.
2338 */
2339 if (tcon_exist)
2340 server->srv_count++;
2341
2342 spin_unlock(&cifs_tcp_ses_lock);
2343
2344 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
18ea4311
GP		 2345 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2346 if (!rc)
96a988ff 2347 cifs_reopen_persistent_handles(tcon);
18ea4311
GP		 2348 else
2349 resched = true;
53e0e11e
PS		 2350 list_del_init(&tcon->rlist);
2351 cifs_put_tcon(tcon);
2352 }
2353
2354 cifs_dbg(FYI, "Reconnecting tcons finished\n");
18ea4311
GP		 2355 if (resched)
2356 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
53e0e11e
PS		 2357 mutex_unlock(&server->reconnect_mutex);
2358
2359 /* now we can safely release srv struct */
2360 if (tcon_exist)
2361 cifs_put_tcp_session(server, 1);
2362}
2363
9094fad1
PS		 2364int
2365SMB2_echo(struct TCP_Server_Info *server)
2366{
2367 struct smb2_echo_req *req;
2368 int rc = 0;
738f9de5
PS		 2369 struct kvec iov[2];
2370 struct smb_rqst rqst = { .rq_iov = iov,
2371 .rq_nvec = 2 };
9094fad1 2372
f96637be 2373 cifs_dbg(FYI, "In echo request\n");
9094fad1 2374
4fcd1813 2375 if (server->tcpStatus == CifsNeedNegotiate) {
53e0e11e
PS		 2376 /* No need to send echo on newly established connections */
2377 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2378 return rc;
4fcd1813
SF		 2379 }
2380
9094fad1
PS		 2381 rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2382 if (rc)
2383 return rc;
2384
31473fc4 2385 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
9094fad1 2386
9094fad1 2387 /* 4 for rfc1002 length field */
738f9de5
PS		 2388 iov[0].iov_len = 4;
2389 iov[0].iov_base = (char *)req;
2390 iov[1].iov_len = get_rfc1002_length(req);
2391 iov[1].iov_base = (char *)req + 4;
9094fad1 2392
9b7c18a2
PS		 2393 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2394 server, CIFS_ECHO_OP);
9094fad1 2395 if (rc)
f96637be 2396 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
9094fad1
PS		 2397
2398 cifs_small_buf_release(req);
2399 return rc;
2400}
7a5cfb19
PS		 2401
2402int
2403SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2404 u64 volatile_fid)
2405{
2406 struct smb2_flush_req *req;
7a5cfb19
PS		 2407 struct cifs_ses *ses = tcon->ses;
2408 struct kvec iov[1];
da502f7d 2409 struct kvec rsp_iov;
7a5cfb19
PS		 2410 int resp_buftype;
2411 int rc = 0;
7fb8986e 2412 int flags = 0;
7a5cfb19 2413
f96637be 2414 cifs_dbg(FYI, "Flush\n");
7a5cfb19 2415
68a6afa7 2416 if (!ses || !(ses->server))
7a5cfb19
PS		 2417 return -EIO;
2418
2419 rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2420 if (rc)
2421 return rc;
2422
7fb8986e
PS		 2423 if (encryption_required(tcon))
2424 flags |= CIFS_TRANSFORM_REQ;
2425
7a5cfb19
PS		 2426 req->PersistentFileId = persistent_fid;
2427 req->VolatileFileId = volatile_fid;
2428
2429 iov[0].iov_base = (char *)req;
2430 /* 4 for rfc1002 length field */
2431 iov[0].iov_len = get_rfc1002_length(req) + 4;
2432
7fb8986e 2433 rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
da502f7d 2434 cifs_small_buf_release(req);
7a5cfb19 2435
dfebe400 2436 if (rc != 0)
7a5cfb19
PS		 2437 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2438
da502f7d 2439 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
7a5cfb19
PS		 2440 return rc;
2441}
09a4707e
PS		 2442
2443/*
2444 * To form a chain of read requests, any read requests after the first should
2445 * have the end_of_chain boolean set to true.
2446 */
2447static int
738f9de5
PS		 2448smb2_new_read_req(void **buf, unsigned int *total_len,
2449 struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2450 int request_type)
09a4707e
PS		 2451{
2452 int rc = -EACCES;
b8f57ee8 2453 struct smb2_read_plain_req *req = NULL;
31473fc4 2454 struct smb2_sync_hdr *shdr;
09a4707e 2455
b8f57ee8
PS		 2456 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2457 total_len);
09a4707e
PS		 2458 if (rc)
2459 return rc;
2460 if (io_parms->tcon->ses->server == NULL)
2461 return -ECONNABORTED;
2462
b8f57ee8 2463 shdr = &req->sync_hdr;
31473fc4 2464 shdr->ProcessId = cpu_to_le32(io_parms->pid);
09a4707e
PS		 2465
2466 req->PersistentFileId = io_parms->persistent_fid;
2467 req->VolatileFileId = io_parms->volatile_fid;
2468 req->ReadChannelInfoOffset = 0; /* reserved */
2469 req->ReadChannelInfoLength = 0; /* reserved */
2470 req->Channel = 0; /* reserved */
2471 req->MinimumCount = 0;
2472 req->Length = cpu_to_le32(io_parms->length);
2473 req->Offset = cpu_to_le64(io_parms->offset);
2474
2475 if (request_type & CHAINED_REQUEST) {
2476 if (!(request_type & END_OF_CHAIN)) {
b8f57ee8
PS		 2477 /* next 8-byte aligned request */
2478 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2479 shdr->NextCommand = cpu_to_le32(*total_len);
09a4707e 2480 } else /* END_OF_CHAIN */
31473fc4 2481 shdr->NextCommand = 0;
09a4707e 2482 if (request_type & RELATED_REQUEST) {
31473fc4 2483 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
09a4707e
PS		 2484 /*
2485 * Related requests use info from previous read request
2486 * in chain.
2487 */
31473fc4
PS		 2488 shdr->SessionId = 0xFFFFFFFF;
2489 shdr->TreeId = 0xFFFFFFFF;
09a4707e
PS		 2490 req->PersistentFileId = 0xFFFFFFFF;
2491 req->VolatileFileId = 0xFFFFFFFF;
2492 }
2493 }
2494 if (remaining_bytes > io_parms->length)
2495 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2496 else
2497 req->RemainingBytes = 0;
2498
738f9de5 2499 *buf = req;
09a4707e
PS		 2500 return rc;
2501}
2502
2503static void
2504smb2_readv_callback(struct mid_q_entry *mid)
2505{
2506 struct cifs_readdata *rdata = mid->callback_data;
2507 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2508 struct TCP_Server_Info *server = tcon->ses->server;
738f9de5
PS		 2509 struct smb2_sync_hdr *shdr =
2510 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
09a4707e 2511 unsigned int credits_received = 1;
738f9de5
PS		 2512 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2513 .rq_nvec = 2,
8321fec4
JL		 2514 .rq_pages = rdata->pages,
2515 .rq_npages = rdata->nr_pages,
2516 .rq_pagesz = rdata->pagesz,
2517 .rq_tailsz = rdata->tailsz };
09a4707e 2518
f96637be
JP		 2519 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2520 __func__, mid->mid, mid->mid_state, rdata->result,
2521 rdata->bytes);
09a4707e
PS		 2522
2523 switch (mid->mid_state) {
2524 case MID_RESPONSE_RECEIVED:
31473fc4 2525 credits_received = le16_to_cpu(shdr->CreditRequest);
09a4707e 2526 /* result already set, check signature */
4326ed2f 2527 if (server->sign && !mid->decrypted) {
3c1bf7e4
PS		 2528 int rc;
2529
0b688cfc 2530 rc = smb2_verify_signature(&rqst, server);
3c1bf7e4 2531 if (rc)
f96637be
JP		 2532 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2533 rc);
3c1bf7e4 2534 }
09a4707e 2535 /* FIXME: should this be counted toward the initiating task? */
34a54d61
PS		 2536 task_io_account_read(rdata->got_bytes);
2537 cifs_stats_bytes_read(tcon, rdata->got_bytes);
09a4707e
PS		 2538 break;
2539 case MID_REQUEST_SUBMITTED:
2540 case MID_RETRY_NEEDED:
2541 rdata->result = -EAGAIN;
d913ed17
PS		 2542 if (server->sign && rdata->got_bytes)
2543 /* reset bytes number since we can not check a sign */
2544 rdata->got_bytes = 0;
2545 /* FIXME: should this be counted toward the initiating task? */
2546 task_io_account_read(rdata->got_bytes);
2547 cifs_stats_bytes_read(tcon, rdata->got_bytes);
09a4707e
PS		 2548 break;
2549 default:
2550 if (rdata->result != -ENODATA)
2551 rdata->result = -EIO;
2552 }
2553
2554 if (rdata->result)
2555 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2556
2557 queue_work(cifsiod_wq, &rdata->work);
2558 DeleteMidQEntry(mid);
2559 add_credits(server, credits_received, 0);
2560}
2561
738f9de5 2562/* smb2_async_readv - send an async read, and set up mid to handle result */
09a4707e
PS		 2563int
2564smb2_async_readv(struct cifs_readdata *rdata)
2565{
bed9da02 2566 int rc, flags = 0;
31473fc4
PS		 2567 char *buf;
2568 struct smb2_sync_hdr *shdr;
09a4707e 2569 struct cifs_io_parms io_parms;
738f9de5
PS		 2570 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2571 .rq_nvec = 2 };
bed9da02 2572 struct TCP_Server_Info *server;
738f9de5 2573 unsigned int total_len;
b8f57ee8 2574 __be32 req_len;
09a4707e 2575
f96637be
JP		 2576 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2577 __func__, rdata->offset, rdata->bytes);
09a4707e
PS		 2578
2579 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2580 io_parms.offset = rdata->offset;
2581 io_parms.length = rdata->bytes;
2582 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2583 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2584 io_parms.pid = rdata->pid;
bed9da02
PS		 2585
2586 server = io_parms.tcon->ses->server;
2587
738f9de5 2588 rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
bed9da02
PS		 2589 if (rc) {
2590 if (rc == -EAGAIN && rdata->credits) {
2591 /* credits was reset by reconnect */
2592 rdata->credits = 0;
2593 /* reduce in_flight value since we won't send the req */
2594 spin_lock(&server->req_lock);
2595 server->in_flight--;
2596 spin_unlock(&server->req_lock);
2597 }
09a4707e 2598 return rc;
bed9da02 2599 }
09a4707e 2600
7fb8986e
PS		 2601 if (encryption_required(io_parms.tcon))
2602 flags |= CIFS_TRANSFORM_REQ;
2603
b8f57ee8
PS		 2604 req_len = cpu_to_be32(total_len);
2605
2606 rdata->iov[0].iov_base = &req_len;
2607 rdata->iov[0].iov_len = sizeof(__be32);
2608 rdata->iov[1].iov_base = buf;
2609 rdata->iov[1].iov_len = total_len;
2610
2611 shdr = (struct smb2_sync_hdr *)buf;
09a4707e 2612
bed9da02 2613 if (rdata->credits) {
31473fc4 2614 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
bed9da02 2615 SMB2_MAX_BUFFER_SIZE));
31473fc4 2616 shdr->CreditRequest = shdr->CreditCharge;
bed9da02
PS		 2617 spin_lock(&server->req_lock);
2618 server->credits += rdata->credits -
31473fc4 2619 le16_to_cpu(shdr->CreditCharge);
bed9da02
PS		 2620 spin_unlock(&server->req_lock);
2621 wake_up(&server->request_q);
7fb8986e 2622 flags |= CIFS_HAS_CREDITS;
bed9da02
PS		 2623 }
2624
09a4707e 2625 kref_get(&rdata->refcount);
fec344e3 2626 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
09a4707e 2627 cifs_readv_receive, smb2_readv_callback,
4326ed2f 2628 smb3_handle_read_data, rdata, flags);
e5d04887 2629 if (rc) {
09a4707e 2630 kref_put(&rdata->refcount, cifs_readdata_release);
e5d04887
PS		 2631 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2632 }
09a4707e
PS		 2633
2634 cifs_small_buf_release(buf);
2635 return rc;
2636}
33319141 2637
d8e05039
PS		 2638int
2639SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2640 unsigned int *nbytes, char **buf, int *buf_type)
2641{
2642 int resp_buftype, rc = -EACCES;
b8f57ee8 2643 struct smb2_read_plain_req *req = NULL;
d8e05039 2644 struct smb2_read_rsp *rsp = NULL;
31473fc4 2645 struct smb2_sync_hdr *shdr;
b8f57ee8 2646 struct kvec iov[2];
da502f7d 2647 struct kvec rsp_iov;
738f9de5 2648 unsigned int total_len;
b8f57ee8
PS		 2649 __be32 req_len;
2650 struct smb_rqst rqst = { .rq_iov = iov,
2651 .rq_nvec = 2 };
7fb8986e
PS		 2652 int flags = CIFS_LOG_ERROR;
2653 struct cifs_ses *ses = io_parms->tcon->ses;
d8e05039
PS		 2654
2655 *nbytes = 0;
738f9de5 2656 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
d8e05039
PS		 2657 if (rc)
2658 return rc;
2659
7fb8986e
PS		 2660 if (encryption_required(io_parms->tcon))
2661 flags |= CIFS_TRANSFORM_REQ;
2662
b8f57ee8 2663 req_len = cpu_to_be32(total_len);
738f9de5 2664
b8f57ee8
PS		 2665 iov[0].iov_base = &req_len;
2666 iov[0].iov_len = sizeof(__be32);
2667 iov[1].iov_base = req;
2668 iov[1].iov_len = total_len;
2669
7fb8986e 2670 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
b8f57ee8 2671 cifs_small_buf_release(req);
d8e05039 2672
da502f7d 2673 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
31473fc4 2674 shdr = get_sync_hdr(rsp);
d8e05039 2675
31473fc4 2676 if (shdr->Status == STATUS_END_OF_FILE) {
da502f7d 2677 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
d8e05039
PS		 2678 return 0;
2679 }
2680
2681 if (rc) {
2682 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
f96637be 2683 cifs_dbg(VFS, "Send error in read = %d\n", rc);
d8e05039
PS		 2684 } else {
2685 *nbytes = le32_to_cpu(rsp->DataLength);
2686 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2687 (*nbytes > io_parms->length)) {
f96637be
JP		 2688 cifs_dbg(FYI, "bad length %d for count %d\n",
2689 *nbytes, io_parms->length);
d8e05039
PS		 2690 rc = -EIO;
2691 *nbytes = 0;
2692 }
2693 }
2694
2695 if (*buf) {
31473fc4 2696 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
da502f7d 2697 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
d8e05039 2698 } else if (resp_buftype != CIFS_NO_BUFFER) {
da502f7d 2699 *buf = rsp_iov.iov_base;
d8e05039
PS		 2700 if (resp_buftype == CIFS_SMALL_BUFFER)
2701 *buf_type = CIFS_SMALL_BUFFER;
2702 else if (resp_buftype == CIFS_LARGE_BUFFER)
2703 *buf_type = CIFS_LARGE_BUFFER;
2704 }
2705 return rc;
2706}
2707
33319141
PS		 2708/*
2709 * Check the mid_state and signature on received buffer (if any), and queue the
2710 * workqueue completion task.
2711 */
2712static void
2713smb2_writev_callback(struct mid_q_entry *mid)
2714{
2715 struct cifs_writedata *wdata = mid->callback_data;
2716 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2717 unsigned int written;
2718 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2719 unsigned int credits_received = 1;
2720
2721 switch (mid->mid_state) {
2722 case MID_RESPONSE_RECEIVED:
31473fc4 2723 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
33319141
PS		 2724 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2725 if (wdata->result != 0)
2726 break;
2727
2728 written = le32_to_cpu(rsp->DataLength);
2729 /*
2730 * Mask off high 16 bits when bytes written as returned
2731 * by the server is greater than bytes requested by the
2732 * client. OS/2 servers are known to set incorrect
2733 * CountHigh values.
2734 */
2735 if (written > wdata->bytes)
2736 written &= 0xFFFF;
2737
2738 if (written < wdata->bytes)
2739 wdata->result = -ENOSPC;
2740 else
2741 wdata->bytes = written;
2742 break;
2743 case MID_REQUEST_SUBMITTED:
2744 case MID_RETRY_NEEDED:
2745 wdata->result = -EAGAIN;
2746 break;
2747 default:
2748 wdata->result = -EIO;
2749 break;
2750 }
2751
2752 if (wdata->result)
2753 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2754
2755 queue_work(cifsiod_wq, &wdata->work);
2756 DeleteMidQEntry(mid);
2757 add_credits(tcon->ses->server, credits_received, 0);
2758}
2759
2760/* smb2_async_writev - send an async write, and set up mid to handle result */
2761int
4a5c80d7
SF		 2762smb2_async_writev(struct cifs_writedata *wdata,
2763 void (*release)(struct kref *kref))
33319141 2764{
cb7e9eab 2765 int rc = -EACCES, flags = 0;
33319141 2766 struct smb2_write_req *req = NULL;
31473fc4 2767 struct smb2_sync_hdr *shdr;
33319141 2768 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
cb7e9eab 2769 struct TCP_Server_Info *server = tcon->ses->server;
738f9de5
PS		 2770 struct kvec iov[2];
2771 struct smb_rqst rqst = { };
33319141
PS		 2772
2773 rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
cb7e9eab
PS		 2774 if (rc) {
2775 if (rc == -EAGAIN && wdata->credits) {
2776 /* credits was reset by reconnect */
2777 wdata->credits = 0;
2778 /* reduce in_flight value since we won't send the req */
2779 spin_lock(&server->req_lock);
2780 server->in_flight--;
2781 spin_unlock(&server->req_lock);
2782 }
33319141 2783 goto async_writev_out;
cb7e9eab 2784 }
33319141 2785
7fb8986e
PS		 2786 if (encryption_required(tcon))
2787 flags |= CIFS_TRANSFORM_REQ;
2788
31473fc4
PS		 2789 shdr = get_sync_hdr(req);
2790 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
33319141
PS		 2791
2792 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2793 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2794 req->WriteChannelInfoOffset = 0;
2795 req->WriteChannelInfoLength = 0;
2796 req->Channel = 0;
2797 req->Offset = cpu_to_le64(wdata->offset);
2798 /* 4 for rfc1002 length field */
2799 req->DataOffset = cpu_to_le16(
2800 offsetof(struct smb2_write_req, Buffer) - 4);
2801 req->RemainingBytes = 0;
2802
2803 /* 4 for rfc1002 length field and 1 for Buffer */
738f9de5
PS		 2804 iov[0].iov_len = 4;
2805 iov[0].iov_base = req;
2806 iov[1].iov_len = get_rfc1002_length(req) - 1;
2807 iov[1].iov_base = (char *)req + 4;
33319141 2808
738f9de5
PS		 2809 rqst.rq_iov = iov;
2810 rqst.rq_nvec = 2;
eddb079d
JL		 2811 rqst.rq_pages = wdata->pages;
2812 rqst.rq_npages = wdata->nr_pages;
2813 rqst.rq_pagesz = wdata->pagesz;
2814 rqst.rq_tailsz = wdata->tailsz;
33319141 2815
f96637be
JP		 2816 cifs_dbg(FYI, "async write at %llu %u bytes\n",
2817 wdata->offset, wdata->bytes);
33319141
PS		 2818
2819 req->Length = cpu_to_le32(wdata->bytes);
2820
2821 inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2822
cb7e9eab 2823 if (wdata->credits) {
31473fc4 2824 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
cb7e9eab 2825 SMB2_MAX_BUFFER_SIZE));
31473fc4 2826 shdr->CreditRequest = shdr->CreditCharge;
cb7e9eab
PS		 2827 spin_lock(&server->req_lock);
2828 server->credits += wdata->credits -
31473fc4 2829 le16_to_cpu(shdr->CreditCharge);
cb7e9eab
PS		 2830 spin_unlock(&server->req_lock);
2831 wake_up(&server->request_q);
7fb8986e 2832 flags |= CIFS_HAS_CREDITS;
cb7e9eab
PS		 2833 }
2834
33319141 2835 kref_get(&wdata->refcount);
9b7c18a2
PS		 2836 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2837 wdata, flags);
33319141 2838
e5d04887 2839 if (rc) {
4a5c80d7 2840 kref_put(&wdata->refcount, release);
e5d04887
PS		 2841 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2842 }
33319141 2843
33319141
PS		 2844async_writev_out:
2845 cifs_small_buf_release(req);
33319141
PS		 2846 return rc;
2847}
009d3443
PS		 2848
2849/*
2850 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2851 * The length field from io_parms must be at least 1 and indicates a number of
2852 * elements with data to write that begins with position 1 in iov array. All
2853 * data length is specified by count.
2854 */
2855int
2856SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2857 unsigned int *nbytes, struct kvec *iov, int n_vec)
2858{
2859 int rc = 0;
2860 struct smb2_write_req *req = NULL;
2861 struct smb2_write_rsp *rsp = NULL;
2862 int resp_buftype;
da502f7d 2863 struct kvec rsp_iov;
7fb8986e 2864 int flags = 0;
da502f7d 2865
009d3443
PS		 2866 *nbytes = 0;
2867
2868 if (n_vec < 1)
2869 return rc;
2870
2871 rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2872 if (rc)
2873 return rc;
2874
2875 if (io_parms->tcon->ses->server == NULL)
2876 return -ECONNABORTED;
2877
7fb8986e
PS		 2878 if (encryption_required(io_parms->tcon))
2879 flags |= CIFS_TRANSFORM_REQ;
2880
31473fc4 2881 req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
009d3443
PS		 2882
2883 req->PersistentFileId = io_parms->persistent_fid;
2884 req->VolatileFileId = io_parms->volatile_fid;
2885 req->WriteChannelInfoOffset = 0;
2886 req->WriteChannelInfoLength = 0;
2887 req->Channel = 0;
2888 req->Length = cpu_to_le32(io_parms->length);
2889 req->Offset = cpu_to_le64(io_parms->offset);
2890 /* 4 for rfc1002 length field */
2891 req->DataOffset = cpu_to_le16(
2892 offsetof(struct smb2_write_req, Buffer) - 4);
2893 req->RemainingBytes = 0;
2894
2895 iov[0].iov_base = (char *)req;
2896 /* 4 for rfc1002 length field and 1 for Buffer */
2897 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2898
2899 /* length of entire message including data to be written */
2900 inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2901
2902 rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
7fb8986e 2903 &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 2904 cifs_small_buf_release(req);
2905 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
009d3443
PS		 2906
2907 if (rc) {
2908 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
f96637be 2909 cifs_dbg(VFS, "Send error in write = %d\n", rc);
e5d04887 2910 } else
009d3443 2911 *nbytes = le32_to_cpu(rsp->DataLength);
e5d04887
PS		 2912
2913 free_rsp_buf(resp_buftype, rsp);
009d3443
PS		 2914 return rc;
2915}
35143eb5 2916
d324f08d
PS		 2917static unsigned int
2918num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2919{
2920 int len;
2921 unsigned int entrycount = 0;
2922 unsigned int next_offset = 0;
2923 FILE_DIRECTORY_INFO *entryptr;
2924
2925 if (bufstart == NULL)
2926 return 0;
2927
2928 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2929
2930 while (1) {
2931 entryptr = (FILE_DIRECTORY_INFO *)
2932 ((char *)entryptr + next_offset);
2933
2934 if ((char *)entryptr + size > end_of_buf) {
f96637be 2935 cifs_dbg(VFS, "malformed search entry would overflow\n");
d324f08d
PS		 2936 break;
2937 }
2938
2939 len = le32_to_cpu(entryptr->FileNameLength);
2940 if ((char *)entryptr + len + size > end_of_buf) {
f96637be
JP		 2941 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2942 end_of_buf);
d324f08d
PS		 2943 break;
2944 }
2945
2946 *lastentry = (char *)entryptr;
2947 entrycount++;
2948
2949 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2950 if (!next_offset)
2951 break;
2952 }
2953
2954 return entrycount;
2955}
2956
2957/*
2958 * Readdir/FindFirst
2959 */
2960int
2961SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2962 u64 persistent_fid, u64 volatile_fid, int index,
2963 struct cifs_search_info *srch_inf)
2964{
2965 struct smb2_query_directory_req *req;
2966 struct smb2_query_directory_rsp *rsp = NULL;
2967 struct kvec iov[2];
da502f7d 2968 struct kvec rsp_iov;
d324f08d
PS		 2969 int rc = 0;
2970 int len;
75fdfc84 2971 int resp_buftype = CIFS_NO_BUFFER;
d324f08d
PS		 2972 unsigned char *bufptr;
2973 struct TCP_Server_Info *server;
2974 struct cifs_ses *ses = tcon->ses;
2975 __le16 asteriks = cpu_to_le16('*');
2976 char *end_of_smb;
2977 unsigned int output_size = CIFSMaxBufSize;
2978 size_t info_buf_size;
7fb8986e 2979 int flags = 0;
d324f08d
PS		 2980
2981 if (ses && (ses->server))
2982 server = ses->server;
2983 else
2984 return -EIO;
2985
2986 rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2987 if (rc)
2988 return rc;
2989
7fb8986e
PS		 2990 if (encryption_required(tcon))
2991 flags |= CIFS_TRANSFORM_REQ;
2992
d324f08d
PS		 2993 switch (srch_inf->info_level) {
2994 case SMB_FIND_FILE_DIRECTORY_INFO:
2995 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2996 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2997 break;
2998 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2999 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3000 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3001 break;
3002 default:
f96637be
JP		 3003 cifs_dbg(VFS, "info level %u isn't supported\n",
3004 srch_inf->info_level);
d324f08d
PS		 3005 rc = -EINVAL;
3006 goto qdir_exit;
3007 }
3008
3009 req->FileIndex = cpu_to_le32(index);
3010 req->PersistentFileId = persistent_fid;
3011 req->VolatileFileId = volatile_fid;
3012
3013 len = 0x2;
3014 bufptr = req->Buffer;
3015 memcpy(bufptr, &asteriks, len);
3016
3017 req->FileNameOffset =
3018 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
3019 req->FileNameLength = cpu_to_le16(len);
3020 /*
3021 * BB could be 30 bytes or so longer if we used SMB2 specific
3022 * buffer lengths, but this is safe and close enough.
3023 */
3024 output_size = min_t(unsigned int, output_size, server->maxBuf);
3025 output_size = min_t(unsigned int, output_size, 2 << 15);
3026 req->OutputBufferLength = cpu_to_le32(output_size);
3027
3028 iov[0].iov_base = (char *)req;
3029 /* 4 for RFC1001 length and 1 for Buffer */
3030 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
3031
3032 iov[1].iov_base = (char *)(req->Buffer);
3033 iov[1].iov_len = len;
3034
3035 inc_rfc1001_len(req, len - 1 /* Buffer */);
3036
7fb8986e 3037 rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 3038 cifs_small_buf_release(req);
3039 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
e5d04887 3040
d324f08d 3041 if (rc) {
31473fc4
PS		 3042 if (rc == -ENODATA &&
3043 rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
52755808
PS		 3044 srch_inf->endOfSearch = true;
3045 rc = 0;
3046 }
d324f08d
PS		 3047 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3048 goto qdir_exit;
3049 }
d324f08d
PS		 3050
3051 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3052 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3053 info_buf_size);
3054 if (rc)
3055 goto qdir_exit;
3056
3057 srch_inf->unicode = true;
3058
3059 if (srch_inf->ntwrk_buf_start) {
3060 if (srch_inf->smallBuf)
3061 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3062 else
3063 cifs_buf_release(srch_inf->ntwrk_buf_start);
3064 }
3065 srch_inf->ntwrk_buf_start = (char *)rsp;
3066 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
3067 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
3068 /* 4 for rfc1002 length field */
3069 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
3070 srch_inf->entries_in_buffer =
3071 num_entries(srch_inf->srch_entries_start, end_of_smb,
3072 &srch_inf->last_entry, info_buf_size);
3073 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
f96637be
JP		 3074 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3075 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3076 srch_inf->srch_entries_start, srch_inf->last_entry);
d324f08d
PS		 3077 if (resp_buftype == CIFS_LARGE_BUFFER)
3078 srch_inf->smallBuf = false;
3079 else if (resp_buftype == CIFS_SMALL_BUFFER)
3080 srch_inf->smallBuf = true;
3081 else
f96637be 3082 cifs_dbg(VFS, "illegal search buffer type\n");
d324f08d 3083
d324f08d
PS		 3084 return rc;
3085
3086qdir_exit:
3087 free_rsp_buf(resp_buftype, rsp);
3088 return rc;
3089}
3090
35143eb5
PS		 3091static int
3092send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
dac95340
SP		 3093 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3094 u8 info_type, u32 additional_info, unsigned int num,
3095 void **data, unsigned int *size)
35143eb5
PS		 3096{
3097 struct smb2_set_info_req *req;
3098 struct smb2_set_info_rsp *rsp = NULL;
3099 struct kvec *iov;
da502f7d 3100 struct kvec rsp_iov;
35143eb5
PS		 3101 int rc = 0;
3102 int resp_buftype;
3103 unsigned int i;
35143eb5 3104 struct cifs_ses *ses = tcon->ses;
7fb8986e 3105 int flags = 0;
35143eb5 3106
68a6afa7 3107 if (!ses || !(ses->server))
35143eb5
PS		 3108 return -EIO;
3109
3110 if (!num)
3111 return -EINVAL;
3112
3113 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3114 if (!iov)
3115 return -ENOMEM;
3116
3117 rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3118 if (rc) {
3119 kfree(iov);
3120 return rc;
3121 }
3122
7fb8986e
PS		 3123 if (encryption_required(tcon))
3124 flags |= CIFS_TRANSFORM_REQ;
3125
31473fc4 3126 req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
c839ff24 3127
dac95340 3128 req->InfoType = info_type;
35143eb5
PS		 3129 req->FileInfoClass = info_class;
3130 req->PersistentFileId = persistent_fid;
3131 req->VolatileFileId = volatile_fid;
dac95340 3132 req->AdditionalInformation = cpu_to_le32(additional_info);
35143eb5
PS		 3133
3134 /* 4 for RFC1001 length and 1 for Buffer */
3135 req->BufferOffset =
3136 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3137 req->BufferLength = cpu_to_le32(*size);
3138
3139 inc_rfc1001_len(req, *size - 1 /* Buffer */);
3140
3141 memcpy(req->Buffer, *data, *size);
3142
3143 iov[0].iov_base = (char *)req;
3144 /* 4 for RFC1001 length */
3145 iov[0].iov_len = get_rfc1002_length(req) + 4;
3146
3147 for (i = 1; i < num; i++) {
3148 inc_rfc1001_len(req, size[i]);
3149 le32_add_cpu(&req->BufferLength, size[i]);
3150 iov[i].iov_base = (char *)data[i];
3151 iov[i].iov_len = size[i];
3152 }
3153
7fb8986e 3154 rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
da502f7d
PS		 3155 cifs_small_buf_release(req);
3156 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
35143eb5 3157
7d3fb24b 3158 if (rc != 0)
35143eb5 3159 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
7d3fb24b 3160
35143eb5
PS		 3161 free_rsp_buf(resp_buftype, rsp);
3162 kfree(iov);
3163 return rc;
3164}
3165
3166int
3167SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3168 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3169{
3170 struct smb2_file_rename_info info;
3171 void **data;
3172 unsigned int size[2];
3173 int rc;
3174 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3175
3176 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3177 if (!data)
3178 return -ENOMEM;
3179
3180 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3181 /* 0 = fail if target already exists */
3182 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3183 info.FileNameLength = cpu_to_le32(len);
3184
3185 data[0] = &info;
3186 size[0] = sizeof(struct smb2_file_rename_info);
3187
3188 data[1] = target_file;
3189 size[1] = len + 2 /* null */;
3190
3191 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3192 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3193 0, 2, data, size);
35143eb5
PS		 3194 kfree(data);
3195 return rc;
3196}
568798cc 3197
897fba11
SF		 3198int
3199SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3200 u64 persistent_fid, u64 volatile_fid)
3201{
3202 __u8 delete_pending = 1;
3203 void *data;
3204 unsigned int size;
3205
3206 data = &delete_pending;
3207 size = 1; /* sizeof __u8 */
3208
3209 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3210 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3211 0, 1, &data, &size);
897fba11
SF		 3212}
3213
568798cc
PS		 3214int
3215SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3216 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3217{
3218 struct smb2_file_link_info info;
3219 void **data;
3220 unsigned int size[2];
3221 int rc;
3222 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3223
3224 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3225 if (!data)
3226 return -ENOMEM;
3227
3228 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3229 /* 0 = fail if link already exists */
3230 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3231 info.FileNameLength = cpu_to_le32(len);
3232
3233 data[0] = &info;
3234 size[0] = sizeof(struct smb2_file_link_info);
3235
3236 data[1] = target_file;
3237 size[1] = len + 2 /* null */;
3238
3239 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3240 current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3241 0, 2, data, size);
568798cc
PS		 3242 kfree(data);
3243 return rc;
3244}
c839ff24
PS		 3245
3246int
3247SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
f29ebb47 3248 u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
c839ff24
PS		 3249{
3250 struct smb2_file_eof_info info;
3251 void *data;
3252 unsigned int size;
3253
3254 info.EndOfFile = *eof;
3255
3256 data = &info;
3257 size = sizeof(struct smb2_file_eof_info);
3258
f29ebb47
SF		 3259 if (is_falloc)
3260 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3261 pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3262 0, 1, &data, &size);
f29ebb47
SF		 3263 else
3264 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3265 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3266 0, 1, &data, &size);
c839ff24 3267}
1feeaac7
PS		 3268
3269int
3270SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3271 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3272{
3273 unsigned int size;
3274 size = sizeof(FILE_BASIC_INFO);
3275 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
dac95340
SP		 3276 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3277 0, 1, (void **)&buf, &size);
3278}
3279
3280int
3281SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3282 u64 persistent_fid, u64 volatile_fid,
3283 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3284{
3285 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3286 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3287 1, (void **)&pnntsd, &pacllen);
1feeaac7 3288}
983c88a4 3289
5517554e
RS		 3290int
3291SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3292 u64 persistent_fid, u64 volatile_fid,
3293 struct smb2_file_full_ea_info *buf, int len)
3294{
3295 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3296 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3297 0, 1, (void **)&buf, &len);
3298}
3299
983c88a4
PS		 3300int
3301SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3302 const u64 persistent_fid, const u64 volatile_fid,
3303 __u8 oplock_level)
3304{
3305 int rc;
3306 struct smb2_oplock_break *req = NULL;
7fb8986e 3307 int flags = CIFS_OBREAK_OP;
983c88a4 3308
f96637be 3309 cifs_dbg(FYI, "SMB2_oplock_break\n");
983c88a4 3310 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
983c88a4
PS		 3311 if (rc)
3312 return rc;
3313
7fb8986e
PS		 3314 if (encryption_required(tcon))
3315 flags |= CIFS_TRANSFORM_REQ;
3316
983c88a4
PS		 3317 req->VolatileFid = volatile_fid;
3318 req->PersistentFid = persistent_fid;
3319 req->OplockLevel = oplock_level;
31473fc4 3320 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
983c88a4 3321
7fb8986e 3322 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
da502f7d 3323 cifs_small_buf_release(req);
983c88a4
PS		 3324
3325 if (rc) {
3326 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
f96637be 3327 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
983c88a4
PS		 3328 }
3329
3330 return rc;
3331}
6fc05c25
PS		 3332
3333static void
3334copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3335 struct kstatfs *kst)
3336{
3337 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3338 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3339 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
42bec214
SP		 3340 kst->f_bfree = kst->f_bavail =
3341 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
6fc05c25
PS		 3342 return;
3343}
3344
3345static int
3346build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3347 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3348{
3349 int rc;
3350 struct smb2_query_info_req *req;
3351
f96637be 3352 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
6fc05c25
PS		 3353
3354 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3355 return -EIO;
3356
3357 rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3358 if (rc)
3359 return rc;
3360
3361 req->InfoType = SMB2_O_INFO_FILESYSTEM;
3362 req->FileInfoClass = level;
3363 req->PersistentFileId = persistent_fid;
3364 req->VolatileFileId = volatile_fid;
3365 /* 4 for rfc1002 length field and 1 for pad */
3366 req->InputBufferOffset =
3367 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3368 req->OutputBufferLength = cpu_to_le32(
3369 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3370
3371 iov->iov_base = (char *)req;
3372 /* 4 for rfc1002 length field */
3373 iov->iov_len = get_rfc1002_length(req) + 4;
3374 return 0;
3375}
3376
3377int
3378SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3379 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3380{
3381 struct smb2_query_info_rsp *rsp = NULL;
3382 struct kvec iov;
da502f7d 3383 struct kvec rsp_iov;
6fc05c25
PS		 3384 int rc = 0;
3385 int resp_buftype;
3386 struct cifs_ses *ses = tcon->ses;
3387 struct smb2_fs_full_size_info *info = NULL;
7fb8986e 3388 int flags = 0;
6fc05c25
PS		 3389
3390 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3391 sizeof(struct smb2_fs_full_size_info),
3392 persistent_fid, volatile_fid);
3393 if (rc)
3394 return rc;
3395
7fb8986e
PS		 3396 if (encryption_required(tcon))
3397 flags |= CIFS_TRANSFORM_REQ;
3398
3399 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
da502f7d 3400 cifs_small_buf_release(iov.iov_base);
6fc05c25
PS		 3401 if (rc) {
3402 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
34f62640 3403 goto qfsinf_exit;
6fc05c25 3404 }
da502f7d 3405 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6fc05c25
PS		 3406
3407 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3408 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3409 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3410 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3411 sizeof(struct smb2_fs_full_size_info));
3412 if (!rc)
3413 copy_fs_info_to_kstatfs(info, fsdata);
3414
34f62640 3415qfsinf_exit:
da502f7d 3416 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
34f62640
SF		 3417 return rc;
3418}
3419
3420int
3421SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2167114c 3422 u64 persistent_fid, u64 volatile_fid, int level)
34f62640
SF		 3423{
3424 struct smb2_query_info_rsp *rsp = NULL;
3425 struct kvec iov;
da502f7d 3426 struct kvec rsp_iov;
34f62640 3427 int rc = 0;
2167114c 3428 int resp_buftype, max_len, min_len;
34f62640
SF		 3429 struct cifs_ses *ses = tcon->ses;
3430 unsigned int rsp_len, offset;
7fb8986e 3431 int flags = 0;
34f62640 3432
2167114c
SF		 3433 if (level == FS_DEVICE_INFORMATION) {
3434 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3435 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3436 } else if (level == FS_ATTRIBUTE_INFORMATION) {
3437 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3438 min_len = MIN_FS_ATTR_INFO_SIZE;
af6a12ea
SF		 3439 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3440 max_len = sizeof(struct smb3_fs_ss_info);
3441 min_len = sizeof(struct smb3_fs_ss_info);
2167114c 3442 } else {
af6a12ea 3443 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2167114c
SF		 3444 return -EINVAL;
3445 }
3446
3447 rc = build_qfs_info_req(&iov, tcon, level, max_len,
34f62640
SF		 3448 persistent_fid, volatile_fid);
3449 if (rc)
3450 return rc;
3451
7fb8986e
PS		 3452 if (encryption_required(tcon))
3453 flags |= CIFS_TRANSFORM_REQ;
3454
3455 rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
da502f7d 3456 cifs_small_buf_release(iov.iov_base);
34f62640
SF		 3457 if (rc) {
3458 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3459 goto qfsattr_exit;
3460 }
da502f7d 3461 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
34f62640
SF		 3462
3463 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3464 offset = le16_to_cpu(rsp->OutputBufferOffset);
2167114c
SF		 3465 rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3466 if (rc)
3467 goto qfsattr_exit;
3468
3469 if (level == FS_ATTRIBUTE_INFORMATION)
34f62640
SF		 3470 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3471 + (char *)&rsp->hdr, min_t(unsigned int,
2167114c
SF		 3472 rsp_len, max_len));
3473 else if (level == FS_DEVICE_INFORMATION)
3474 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3475 + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
af6a12ea
SF		 3476 else if (level == FS_SECTOR_SIZE_INFORMATION) {
3477 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3478 (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3479 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3480 tcon->perf_sector_size =
3481 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3482 }
34f62640
SF		 3483
3484qfsattr_exit:
da502f7d 3485 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6fc05c25
PS		 3486 return rc;
3487}
f7ba7fe6
PS		 3488
3489int
3490smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3491 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3492 const __u32 num_lock, struct smb2_lock_element *buf)
3493{
3494 int rc = 0;
3495 struct smb2_lock_req *req = NULL;
3496 struct kvec iov[2];
da502f7d 3497 struct kvec rsp_iov;
f7ba7fe6
PS		 3498 int resp_buf_type;
3499 unsigned int count;
7fb8986e 3500 int flags = CIFS_NO_RESP;
f7ba7fe6 3501
f96637be 3502 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
f7ba7fe6
PS		 3503
3504 rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3505 if (rc)
3506 return rc;
3507
7fb8986e
PS		 3508 if (encryption_required(tcon))
3509 flags |= CIFS_TRANSFORM_REQ;
3510
31473fc4 3511 req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
f7ba7fe6
PS		 3512 req->LockCount = cpu_to_le16(num_lock);
3513
3514 req->PersistentFileId = persist_fid;
3515 req->VolatileFileId = volatile_fid;
3516
3517 count = num_lock * sizeof(struct smb2_lock_element);
3518 inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3519
3520 iov[0].iov_base = (char *)req;
3521 /* 4 for rfc1002 length field and count for all locks */
3522 iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3523 iov[1].iov_base = (char *)buf;
3524 iov[1].iov_len = count;
3525
3526 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
7fb8986e 3527 rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
da502f7d
PS		 3528 &rsp_iov);
3529 cifs_small_buf_release(req);
f7ba7fe6 3530 if (rc) {
f96637be 3531 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
f7ba7fe6
PS		 3532 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3533 }
3534
3535 return rc;
3536}
3537
3538int
3539SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3540 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3541 const __u64 length, const __u64 offset, const __u32 lock_flags,
3542 const bool wait)
3543{
3544 struct smb2_lock_element lock;
3545
3546 lock.Offset = cpu_to_le64(offset);
3547 lock.Length = cpu_to_le64(length);
3548 lock.Flags = cpu_to_le32(lock_flags);
3549 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3550 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3551
3552 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3553}
0822f514
PS		 3554
3555int
3556SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3557 __u8 *lease_key, const __le32 lease_state)
3558{
3559 int rc;
3560 struct smb2_lease_ack *req = NULL;
7fb8986e 3561 int flags = CIFS_OBREAK_OP;
0822f514 3562
f96637be 3563 cifs_dbg(FYI, "SMB2_lease_break\n");
0822f514 3564 rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
0822f514
PS		 3565 if (rc)
3566 return rc;
3567
7fb8986e
PS		 3568 if (encryption_required(tcon))
3569 flags |= CIFS_TRANSFORM_REQ;
3570
31473fc4 3571 req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
0822f514
PS		 3572 req->StructureSize = cpu_to_le16(36);
3573 inc_rfc1001_len(req, 12);
3574
3575 memcpy(req->LeaseKey, lease_key, 16);
3576 req->LeaseState = lease_state;
3577
7fb8986e 3578 rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
da502f7d 3579 cifs_small_buf_release(req);
0822f514
PS		 3580
3581 if (rc) {
3582 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
f96637be 3583 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
0822f514
PS		 3584 }
3585
3586 return rc;
3587}
Linux 6.x block layer and io_uring tree(s)