projects / linux-2.6-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
smb3: allow more detailed protocol info on open files for debugging
[linux-2.6-block.git] / fs / cifs / smb2pdu.c
... / ...
CommitLineData
1/*
2 * fs/cifs/smb2pdu.c
3 *
4 * Copyright (C) International Business Machines Corp., 2009, 2013
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * Contains the routines for constructing the SMB2 PDUs themselves
10 *
11 * This library is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published
13 * by the Free Software Foundation; either version 2.1 of the License, or
14 * (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
19 * the GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this library; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
27 /* Note that there are handle based routines which must be */
28 /* treated slightly differently for reconnection purposes since we never */
29 /* want to reuse a stale file handle and only the caller knows the file info */
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/vfs.h>
34#include <linux/task_io_accounting_ops.h>
35#include <linux/uaccess.h>
36#include <linux/uuid.h>
37#include <linux/pagemap.h>
38#include <linux/xattr.h>
39#include "smb2pdu.h"
40#include "cifsglob.h"
41#include "cifsacl.h"
42#include "cifsproto.h"
43#include "smb2proto.h"
44#include "cifs_unicode.h"
45#include "cifs_debug.h"
46#include "ntlmssp.h"
47#include "smb2status.h"
48#include "smb2glob.h"
49#include "cifspdu.h"
50#include "cifs_spnego.h"
51#include "smbdirect.h"
52#include "trace.h"
53
54/*
55 * The following table defines the expected "StructureSize" of SMB2 requests
56 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
57 *
58 * Note that commands are defined in smb2pdu.h in le16 but the array below is
59 * indexed by command in host byte order.
60 */
61static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
62 /* SMB2_NEGOTIATE */ 36,
63 /* SMB2_SESSION_SETUP */ 25,
64 /* SMB2_LOGOFF */ 4,
65 /* SMB2_TREE_CONNECT */ 9,
66 /* SMB2_TREE_DISCONNECT */ 4,
67 /* SMB2_CREATE */ 57,
68 /* SMB2_CLOSE */ 24,
69 /* SMB2_FLUSH */ 24,
70 /* SMB2_READ */ 49,
71 /* SMB2_WRITE */ 49,
72 /* SMB2_LOCK */ 48,
73 /* SMB2_IOCTL */ 57,
74 /* SMB2_CANCEL */ 4,
75 /* SMB2_ECHO */ 4,
76 /* SMB2_QUERY_DIRECTORY */ 33,
77 /* SMB2_CHANGE_NOTIFY */ 32,
78 /* SMB2_QUERY_INFO */ 41,
79 /* SMB2_SET_INFO */ 33,
80 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
81};
82
83int smb3_encryption_required(const struct cifs_tcon *tcon)
84{
85 if (!tcon)
86 return 0;
87 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
88 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
89 return 1;
90 if (tcon->seal &&
91 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
92 return 1;
93 return 0;
94}
95
96static void
97smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
98 const struct cifs_tcon *tcon)
99{
100 shdr->ProtocolId = SMB2_PROTO_NUMBER;
101 shdr->StructureSize = cpu_to_le16(64);
102 shdr->Command = smb2_cmd;
103 if (tcon && tcon->ses && tcon->ses->server) {
104 struct TCP_Server_Info *server = tcon->ses->server;
105
106 spin_lock(&server->req_lock);
107 /* Request up to 2 credits but don't go over the limit. */
108 if (server->credits >= server->max_credits)
109 shdr->CreditRequest = cpu_to_le16(0);
110 else
111 shdr->CreditRequest = cpu_to_le16(
112 min_t(int, server->max_credits -
113 server->credits, 2));
114 spin_unlock(&server->req_lock);
115 } else {
116 shdr->CreditRequest = cpu_to_le16(2);
117 }
118 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
119
120 if (!tcon)
121 goto out;
122
123 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
124 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
125 if ((tcon->ses) && (tcon->ses->server) &&
126 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
127 shdr->CreditCharge = cpu_to_le16(1);
128 /* else CreditCharge MBZ */
129
130 shdr->TreeId = tcon->tid;
131 /* Uid is not converted */
132 if (tcon->ses)
133 shdr->SessionId = tcon->ses->Suid;
134
135 /*
136 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
137 * to pass the path on the Open SMB prefixed by \\server\share.
138 * Not sure when we would need to do the augmented path (if ever) and
139 * setting this flag breaks the SMB2 open operation since it is
140 * illegal to send an empty path name (without \\server\share prefix)
141 * when the DFS flag is set in the SMB open header. We could
142 * consider setting the flag on all operations other than open
143 * but it is safer to net set it for now.
144 */
145/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
146 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
147
148 if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
149 !smb3_encryption_required(tcon))
150 shdr->Flags |= SMB2_FLAGS_SIGNED;
151out:
152 return;
153}
154
155static int
156smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
157{
158 int rc;
159 struct nls_table *nls_codepage;
160 struct cifs_ses *ses;
161 struct TCP_Server_Info *server;
162
163 /*
164 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
165 * check for tcp and smb session status done differently
166 * for those three - in the calling routine.
167 */
168 if (tcon == NULL)
169 return 0;
170
171 if (smb2_command == SMB2_TREE_CONNECT)
172 return 0;
173
174 if (tcon->tidStatus == CifsExiting) {
175 /*
176 * only tree disconnect, open, and write,
177 * (and ulogoff which does not have tcon)
178 * are allowed as we start force umount.
179 */
180 if ((smb2_command != SMB2_WRITE) &&
181 (smb2_command != SMB2_CREATE) &&
182 (smb2_command != SMB2_TREE_DISCONNECT)) {
183 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
184 smb2_command);
185 return -ENODEV;
186 }
187 }
188 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
189 (!tcon->ses->server))
190 return -EIO;
191
192 ses = tcon->ses;
193 server = ses->server;
194
195 /*
196 * Give demultiplex thread up to 10 seconds to reconnect, should be
197 * greater than cifs socket timeout which is 7 seconds
198 */
199 while (server->tcpStatus == CifsNeedReconnect) {
200 /*
201 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
202 * here since they are implicitly done when session drops.
203 */
204 switch (smb2_command) {
205 /*
206 * BB Should we keep oplock break and add flush to exceptions?
207 */
208 case SMB2_TREE_DISCONNECT:
209 case SMB2_CANCEL:
210 case SMB2_CLOSE:
211 case SMB2_OPLOCK_BREAK:
212 return -EAGAIN;
213 }
214
215 rc = wait_event_interruptible_timeout(server->response_q,
216 (server->tcpStatus != CifsNeedReconnect),
217 10 * HZ);
218 if (rc < 0) {
219 cifs_dbg(FYI, "%s: aborting reconnect due to a received"
220 " signal by the process\n", __func__);
221 return -ERESTARTSYS;
222 }
223
224 /* are we still trying to reconnect? */
225 if (server->tcpStatus != CifsNeedReconnect)
226 break;
227
228 /*
229 * on "soft" mounts we wait once. Hard mounts keep
230 * retrying until process is killed or server comes
231 * back on-line
232 */
233 if (!tcon->retry) {
234 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
235 return -EHOSTDOWN;
236 }
237 }
238
239 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
240 return 0;
241
242 nls_codepage = load_nls_default();
243
244 /*
245 * need to prevent multiple threads trying to simultaneously reconnect
246 * the same SMB session
247 */
248 mutex_lock(&tcon->ses->session_mutex);
249
250 /*
251 * Recheck after acquire mutex. If another thread is negotiating
252 * and the server never sends an answer the socket will be closed
253 * and tcpStatus set to reconnect.
254 */
255 if (server->tcpStatus == CifsNeedReconnect) {
256 rc = -EHOSTDOWN;
257 mutex_unlock(&tcon->ses->session_mutex);
258 goto out;
259 }
260
261 rc = cifs_negotiate_protocol(0, tcon->ses);
262 if (!rc && tcon->ses->need_reconnect)
263 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
264
265 if (rc || !tcon->need_reconnect) {
266 mutex_unlock(&tcon->ses->session_mutex);
267 goto out;
268 }
269
270 cifs_mark_open_files_invalid(tcon);
271 if (tcon->use_persistent)
272 tcon->need_reopen_files = true;
273
274 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
275 mutex_unlock(&tcon->ses->session_mutex);
276
277 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
278 if (rc) {
279 /* If sess reconnected but tcon didn't, something strange ... */
280 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
281 goto out;
282 }
283
284 if (smb2_command != SMB2_INTERNAL_CMD)
285 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
286
287 atomic_inc(&tconInfoReconnectCount);
288out:
289 /*
290 * Check if handle based operation so we know whether we can continue
291 * or not without returning to caller to reset file handle.
292 */
293 /*
294 * BB Is flush done by server on drop of tcp session? Should we special
295 * case it and skip above?
296 */
297 switch (smb2_command) {
298 case SMB2_FLUSH:
299 case SMB2_READ:
300 case SMB2_WRITE:
301 case SMB2_LOCK:
302 case SMB2_IOCTL:
303 case SMB2_QUERY_DIRECTORY:
304 case SMB2_CHANGE_NOTIFY:
305 case SMB2_QUERY_INFO:
306 case SMB2_SET_INFO:
307 rc = -EAGAIN;
308 }
309 unload_nls(nls_codepage);
310 return rc;
311}
312
313static void
314fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
315 unsigned int *total_len)
316{
317 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
318 /* lookup word count ie StructureSize from table */
319 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
320
321 /*
322 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
323 * largest operations (Create)
324 */
325 memset(buf, 0, 256);
326
327 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
328 spdu->StructureSize2 = cpu_to_le16(parmsize);
329
330 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
331}
332
333/*
334 * Allocate and return pointer to an SMB request hdr, and set basic
335 * SMB information in the SMB header. If the return code is zero, this
336 * function must have filled in request_buf pointer.
337 */
338static int
339smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
340 void **request_buf, unsigned int *total_len)
341{
342 int rc;
343
344 rc = smb2_reconnect(smb2_command, tcon);
345 if (rc)
346 return rc;
347
348 /* BB eventually switch this to SMB2 specific small buf size */
349 if (smb2_command == SMB2_SET_INFO)
350 *request_buf = cifs_buf_get();
351 else
352 *request_buf = cifs_small_buf_get();
353 if (*request_buf == NULL) {
354 /* BB should we add a retry in here if not a writepage? */
355 return -ENOMEM;
356 }
357
358 fill_small_buf(smb2_command, tcon,
359 (struct smb2_sync_hdr *)(*request_buf),
360 total_len);
361
362 if (tcon != NULL) {
363 uint16_t com_code = le16_to_cpu(smb2_command);
364 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
365 cifs_stats_inc(&tcon->num_smbs_sent);
366 }
367
368 return rc;
369}
370
371
372/* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
373#define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) */
374
375
376#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
377#define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
378#define SMB2_POSIX_EXTENSIONS_AVAILABLE cpu_to_le16(0x100)
379
380static void
381build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
382{
383 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
384 pneg_ctxt->DataLength = cpu_to_le16(38);
385 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
386 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
387 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
388 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
389}
390
391static void
392build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
393{
394 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
395 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
396 pneg_ctxt->CipherCount = cpu_to_le16(1);
397/* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
398 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
399}
400
401static void
402build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
403{
404 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
405 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
406}
407
408static void
409assemble_neg_contexts(struct smb2_negotiate_req *req,
410 unsigned int *total_len)
411{
412 char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
413 unsigned int ctxt_len;
414
415 *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
416 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
417 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
418 *total_len += ctxt_len;
419 pneg_ctxt += ctxt_len;
420
421 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
422 ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
423 *total_len += ctxt_len;
424 pneg_ctxt += ctxt_len;
425
426 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
427 *total_len += sizeof(struct smb2_posix_neg_context);
428
429 req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
430 req->NegotiateContextCount = cpu_to_le16(3);
431}
432
433static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
434{
435 unsigned int len = le16_to_cpu(ctxt->DataLength);
436
437 /* If invalid preauth context warn but use what we requested, SHA-512 */
438 if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
439 printk_once(KERN_WARNING "server sent bad preauth context\n");
440 return;
441 }
442 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
443 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
444 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
445 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
446}
447
448static int decode_encrypt_ctx(struct TCP_Server_Info *server,
449 struct smb2_encryption_neg_context *ctxt)
450{
451 unsigned int len = le16_to_cpu(ctxt->DataLength);
452
453 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
454 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
455 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
456 return -EINVAL;
457 }
458
459 if (le16_to_cpu(ctxt->CipherCount) != 1) {
460 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
461 return -EINVAL;
462 }
463 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
464 if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
465 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
466 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
467 return -EINVAL;
468 }
469 server->cipher_type = ctxt->Ciphers[0];
470 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
471 return 0;
472}
473
474static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
475 struct TCP_Server_Info *server,
476 unsigned int len_of_smb)
477{
478 struct smb2_neg_context *pctx;
479 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
480 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
481 unsigned int len_of_ctxts, i;
482 int rc = 0;
483
484 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
485 if (len_of_smb <= offset) {
486 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
487 return -EINVAL;
488 }
489
490 len_of_ctxts = len_of_smb - offset;
491
492 for (i = 0; i < ctxt_cnt; i++) {
493 int clen;
494 /* check that offset is not beyond end of SMB */
495 if (len_of_ctxts == 0)
496 break;
497
498 if (len_of_ctxts < sizeof(struct smb2_neg_context))
499 break;
500
501 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
502 clen = le16_to_cpu(pctx->DataLength);
503 if (clen > len_of_ctxts)
504 break;
505
506 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
507 decode_preauth_context(
508 (struct smb2_preauth_neg_context *)pctx);
509 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
510 rc = decode_encrypt_ctx(server,
511 (struct smb2_encryption_neg_context *)pctx);
512 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
513 server->posix_ext_supported = true;
514 else
515 cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
516 le16_to_cpu(pctx->ContextType));
517
518 if (rc)
519 break;
520 /* offsets must be 8 byte aligned */
521 clen = (clen + 7) & ~0x7;
522 offset += clen + sizeof(struct smb2_neg_context);
523 len_of_ctxts -= clen;
524 }
525 return rc;
526}
527
528static struct create_posix *
529create_posix_buf(umode_t mode)
530{
531 struct create_posix *buf;
532
533 buf = kzalloc(sizeof(struct create_posix),
534 GFP_KERNEL);
535 if (!buf)
536 return NULL;
537
538 buf->ccontext.DataOffset =
539 cpu_to_le16(offsetof(struct create_posix, Mode));
540 buf->ccontext.DataLength = cpu_to_le32(4);
541 buf->ccontext.NameOffset =
542 cpu_to_le16(offsetof(struct create_posix, Name));
543 buf->ccontext.NameLength = cpu_to_le16(16);
544
545 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
546 buf->Name[0] = 0x93;
547 buf->Name[1] = 0xAD;
548 buf->Name[2] = 0x25;
549 buf->Name[3] = 0x50;
550 buf->Name[4] = 0x9C;
551 buf->Name[5] = 0xB4;
552 buf->Name[6] = 0x11;
553 buf->Name[7] = 0xE7;
554 buf->Name[8] = 0xB4;
555 buf->Name[9] = 0x23;
556 buf->Name[10] = 0x83;
557 buf->Name[11] = 0xDE;
558 buf->Name[12] = 0x96;
559 buf->Name[13] = 0x8B;
560 buf->Name[14] = 0xCD;
561 buf->Name[15] = 0x7C;
562 buf->Mode = cpu_to_le32(mode);
563 cifs_dbg(FYI, "mode on posix create 0%o", mode);
564 return buf;
565}
566
567static int
568add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
569{
570 struct smb2_create_req *req = iov[0].iov_base;
571 unsigned int num = *num_iovec;
572
573 iov[num].iov_base = create_posix_buf(mode);
574 if (iov[num].iov_base == NULL)
575 return -ENOMEM;
576 iov[num].iov_len = sizeof(struct create_posix);
577 if (!req->CreateContextsOffset)
578 req->CreateContextsOffset = cpu_to_le32(
579 sizeof(struct smb2_create_req) +
580 iov[num - 1].iov_len);
581 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
582 *num_iovec = num + 1;
583 return 0;
584}
585
586
587/*
588 *
589 * SMB2 Worker functions follow:
590 *
591 * The general structure of the worker functions is:
592 * 1) Call smb2_init (assembles SMB2 header)
593 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
594 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
595 * 4) Decode SMB2 command specific fields in the fixed length area
596 * 5) Decode variable length data area (if any for this SMB2 command type)
597 * 6) Call free smb buffer
598 * 7) return
599 *
600 */
601
602int
603SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
604{
605 struct smb_rqst rqst;
606 struct smb2_negotiate_req *req;
607 struct smb2_negotiate_rsp *rsp;
608 struct kvec iov[1];
609 struct kvec rsp_iov;
610 int rc = 0;
611 int resp_buftype;
612 struct TCP_Server_Info *server = ses->server;
613 int blob_offset, blob_length;
614 char *security_blob;
615 int flags = CIFS_NEG_OP;
616 unsigned int total_len;
617
618 cifs_dbg(FYI, "Negotiate protocol\n");
619
620 if (!server) {
621 WARN(1, "%s: server is NULL!\n", __func__);
622 return -EIO;
623 }
624
625 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
626 if (rc)
627 return rc;
628
629 req->sync_hdr.SessionId = 0;
630
631 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
632 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
633
634 if (strcmp(ses->server->vals->version_string,
635 SMB3ANY_VERSION_STRING) == 0) {
636 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
637 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
638 req->DialectCount = cpu_to_le16(2);
639 total_len += 4;
640 } else if (strcmp(ses->server->vals->version_string,
641 SMBDEFAULT_VERSION_STRING) == 0) {
642 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
643 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
644 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
645 req->DialectCount = cpu_to_le16(3);
646 total_len += 6;
647 } else {
648 /* otherwise send specific dialect */
649 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
650 req->DialectCount = cpu_to_le16(1);
651 total_len += 2;
652 }
653
654 /* only one of SMB2 signing flags may be set in SMB2 request */
655 if (ses->sign)
656 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
657 else if (global_secflags & CIFSSEC_MAY_SIGN)
658 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
659 else
660 req->SecurityMode = 0;
661
662 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
663
664 /* ClientGUID must be zero for SMB2.02 dialect */
665 if (ses->server->vals->protocol_id == SMB20_PROT_ID)
666 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
667 else {
668 memcpy(req->ClientGUID, server->client_guid,
669 SMB2_CLIENT_GUID_SIZE);
670 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
671 assemble_neg_contexts(req, &total_len);
672 }
673 iov[0].iov_base = (char *)req;
674 iov[0].iov_len = total_len;
675
676 memset(&rqst, 0, sizeof(struct smb_rqst));
677 rqst.rq_iov = iov;
678 rqst.rq_nvec = 1;
679
680 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
681 cifs_small_buf_release(req);
682 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
683 /*
684 * No tcon so can't do
685 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
686 */
687 if (rc == -EOPNOTSUPP) {
688 cifs_dbg(VFS, "Dialect not supported by server. Consider "
689 "specifying vers=1.0 or vers=2.0 on mount for accessing"
690 " older servers\n");
691 goto neg_exit;
692 } else if (rc != 0)
693 goto neg_exit;
694
695 if (strcmp(ses->server->vals->version_string,
696 SMB3ANY_VERSION_STRING) == 0) {
697 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
698 cifs_dbg(VFS,
699 "SMB2 dialect returned but not requested\n");
700 return -EIO;
701 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
702 cifs_dbg(VFS,
703 "SMB2.1 dialect returned but not requested\n");
704 return -EIO;
705 }
706 } else if (strcmp(ses->server->vals->version_string,
707 SMBDEFAULT_VERSION_STRING) == 0) {
708 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
709 cifs_dbg(VFS,
710 "SMB2 dialect returned but not requested\n");
711 return -EIO;
712 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
713 /* ops set to 3.0 by default for default so update */
714 ses->server->ops = &smb21_operations;
715 }
716 } else if (le16_to_cpu(rsp->DialectRevision) !=
717 ses->server->vals->protocol_id) {
718 /* if requested single dialect ensure returned dialect matched */
719 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
720 le16_to_cpu(rsp->DialectRevision));
721 return -EIO;
722 }
723
724 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
725
726 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
727 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
728 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
729 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
730 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
731 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
732 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
733 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
734 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
735 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
736 else {
737 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
738 le16_to_cpu(rsp->DialectRevision));
739 rc = -EIO;
740 goto neg_exit;
741 }
742 server->dialect = le16_to_cpu(rsp->DialectRevision);
743
744 /*
745 * Keep a copy of the hash after negprot. This hash will be
746 * the starting hash value for all sessions made from this
747 * server.
748 */
749 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
750 SMB2_PREAUTH_HASH_SIZE);
751
752 /* SMB2 only has an extended negflavor */
753 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
754 /* set it to the maximum buffer size value we can send with 1 credit */
755 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
756 SMB2_MAX_BUFFER_SIZE);
757 server->max_read = le32_to_cpu(rsp->MaxReadSize);
758 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
759 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
760 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
761 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
762 server->sec_mode);
763 server->capabilities = le32_to_cpu(rsp->Capabilities);
764 /* Internal types */
765 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
766
767 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
768 (struct smb2_sync_hdr *)rsp);
769 /*
770 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
771 * for us will be
772 * ses->sectype = RawNTLMSSP;
773 * but for time being this is our only auth choice so doesn't matter.
774 * We just found a server which sets blob length to zero expecting raw.
775 */
776 if (blob_length == 0) {
777 cifs_dbg(FYI, "missing security blob on negprot\n");
778 server->sec_ntlmssp = true;
779 }
780
781 rc = cifs_enable_signing(server, ses->sign);
782 if (rc)
783 goto neg_exit;
784 if (blob_length) {
785 rc = decode_negTokenInit(security_blob, blob_length, server);
786 if (rc == 1)
787 rc = 0;
788 else if (rc == 0)
789 rc = -EIO;
790 }
791
792 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
793 if (rsp->NegotiateContextCount)
794 rc = smb311_decode_neg_context(rsp, server,
795 rsp_iov.iov_len);
796 else
797 cifs_dbg(VFS, "Missing expected negotiate contexts\n");
798 }
799neg_exit:
800 free_rsp_buf(resp_buftype, rsp);
801 return rc;
802}
803
804int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
805{
806 int rc;
807 struct validate_negotiate_info_req *pneg_inbuf;
808 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
809 u32 rsplen;
810 u32 inbuflen; /* max of 4 dialects */
811
812 cifs_dbg(FYI, "validate negotiate\n");
813
814 /* In SMB3.11 preauth integrity supersedes validate negotiate */
815 if (tcon->ses->server->dialect == SMB311_PROT_ID)
816 return 0;
817
818 /*
819 * validation ioctl must be signed, so no point sending this if we
820 * can not sign it (ie are not known user). Even if signing is not
821 * required (enabled but not negotiated), in those cases we selectively
822 * sign just this, the first and only signed request on a connection.
823 * Having validation of negotiate info helps reduce attack vectors.
824 */
825 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
826 return 0; /* validation requires signing */
827
828 if (tcon->ses->user_name == NULL) {
829 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
830 return 0; /* validation requires signing */
831 }
832
833 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
834 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
835
836 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
837 if (!pneg_inbuf)
838 return -ENOMEM;
839
840 pneg_inbuf->Capabilities =
841 cpu_to_le32(tcon->ses->server->vals->req_capabilities);
842 memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
843 SMB2_CLIENT_GUID_SIZE);
844
845 if (tcon->ses->sign)
846 pneg_inbuf->SecurityMode =
847 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
848 else if (global_secflags & CIFSSEC_MAY_SIGN)
849 pneg_inbuf->SecurityMode =
850 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
851 else
852 pneg_inbuf->SecurityMode = 0;
853
854
855 if (strcmp(tcon->ses->server->vals->version_string,
856 SMB3ANY_VERSION_STRING) == 0) {
857 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
858 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
859 pneg_inbuf->DialectCount = cpu_to_le16(2);
860 /* structure is big enough for 3 dialects, sending only 2 */
861 inbuflen = sizeof(*pneg_inbuf) -
862 sizeof(pneg_inbuf->Dialects[0]);
863 } else if (strcmp(tcon->ses->server->vals->version_string,
864 SMBDEFAULT_VERSION_STRING) == 0) {
865 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
866 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
867 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
868 pneg_inbuf->DialectCount = cpu_to_le16(3);
869 /* structure is big enough for 3 dialects */
870 inbuflen = sizeof(*pneg_inbuf);
871 } else {
872 /* otherwise specific dialect was requested */
873 pneg_inbuf->Dialects[0] =
874 cpu_to_le16(tcon->ses->server->vals->protocol_id);
875 pneg_inbuf->DialectCount = cpu_to_le16(1);
876 /* structure is big enough for 3 dialects, sending only 1 */
877 inbuflen = sizeof(*pneg_inbuf) -
878 sizeof(pneg_inbuf->Dialects[0]) * 2;
879 }
880
881 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
882 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
883 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
884
885 if (rc != 0) {
886 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
887 rc = -EIO;
888 goto out_free_inbuf;
889 }
890
891 rc = -EIO;
892 if (rsplen != sizeof(*pneg_rsp)) {
893 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
894 rsplen);
895
896 /* relax check since Mac returns max bufsize allowed on ioctl */
897 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
898 goto out_free_rsp;
899 }
900
901 /* check validate negotiate info response matches what we got earlier */
902 if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
903 goto vneg_out;
904
905 if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
906 goto vneg_out;
907
908 /* do not validate server guid because not saved at negprot time yet */
909
910 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
911 SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
912 goto vneg_out;
913
914 /* validate negotiate successful */
915 rc = 0;
916 cifs_dbg(FYI, "validate negotiate info successful\n");
917 goto out_free_rsp;
918
919vneg_out:
920 cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
921out_free_rsp:
922 kfree(pneg_rsp);
923out_free_inbuf:
924 kfree(pneg_inbuf);
925 return rc;
926}
927
928enum securityEnum
929smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
930{
931 switch (requested) {
932 case Kerberos:
933 case RawNTLMSSP:
934 return requested;
935 case NTLMv2:
936 return RawNTLMSSP;
937 case Unspecified:
938 if (server->sec_ntlmssp &&
939 (global_secflags & CIFSSEC_MAY_NTLMSSP))
940 return RawNTLMSSP;
941 if ((server->sec_kerberos || server->sec_mskerberos) &&
942 (global_secflags & CIFSSEC_MAY_KRB5))
943 return Kerberos;
944 /* Fallthrough */
945 default:
946 return Unspecified;
947 }
948}
949
950struct SMB2_sess_data {
951 unsigned int xid;
952 struct cifs_ses *ses;
953 struct nls_table *nls_cp;
954 void (*func)(struct SMB2_sess_data *);
955 int result;
956 u64 previous_session;
957
958 /* we will send the SMB in three pieces:
959 * a fixed length beginning part, an optional
960 * SPNEGO blob (which can be zero length), and a
961 * last part which will include the strings
962 * and rest of bcc area. This allows us to avoid
963 * a large buffer 17K allocation
964 */
965 int buf0_type;
966 struct kvec iov[2];
967};
968
969static int
970SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
971{
972 int rc;
973 struct cifs_ses *ses = sess_data->ses;
974 struct smb2_sess_setup_req *req;
975 struct TCP_Server_Info *server = ses->server;
976 unsigned int total_len;
977
978 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
979 &total_len);
980 if (rc)
981 return rc;
982
983 /* First session, not a reauthenticate */
984 req->sync_hdr.SessionId = 0;
985
986 /* if reconnect, we need to send previous sess id, otherwise it is 0 */
987 req->PreviousSessionId = sess_data->previous_session;
988
989 req->Flags = 0; /* MBZ */
990
991 /* enough to enable echos and oplocks and one max size write */
992 req->sync_hdr.CreditRequest = cpu_to_le16(130);
993
994 /* only one of SMB2 signing flags may be set in SMB2 request */
995 if (server->sign)
996 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
997 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
998 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
999 else
1000 req->SecurityMode = 0;
1001
1002 req->Capabilities = 0;
1003 req->Channel = 0; /* MBZ */
1004
1005 sess_data->iov[0].iov_base = (char *)req;
1006 /* 1 for pad */
1007 sess_data->iov[0].iov_len = total_len - 1;
1008 /*
1009 * This variable will be used to clear the buffer
1010 * allocated above in case of any error in the calling function.
1011 */
1012 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1013
1014 return 0;
1015}
1016
1017static void
1018SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1019{
1020 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1021 sess_data->buf0_type = CIFS_NO_BUFFER;
1022}
1023
1024static int
1025SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1026{
1027 int rc;
1028 struct smb_rqst rqst;
1029 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1030 struct kvec rsp_iov = { NULL, 0 };
1031
1032 /* Testing shows that buffer offset must be at location of Buffer[0] */
1033 req->SecurityBufferOffset =
1034 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1035 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1036
1037 memset(&rqst, 0, sizeof(struct smb_rqst));
1038 rqst.rq_iov = sess_data->iov;
1039 rqst.rq_nvec = 2;
1040
1041 /* BB add code to build os and lm fields */
1042 rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1043 &rqst,
1044 &sess_data->buf0_type,
1045 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1046 cifs_small_buf_release(sess_data->iov[0].iov_base);
1047 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1048
1049 return rc;
1050}
1051
1052static int
1053SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1054{
1055 int rc = 0;
1056 struct cifs_ses *ses = sess_data->ses;
1057
1058 mutex_lock(&ses->server->srv_mutex);
1059 if (ses->server->ops->generate_signingkey) {
1060 rc = ses->server->ops->generate_signingkey(ses);
1061 if (rc) {
1062 cifs_dbg(FYI,
1063 "SMB3 session key generation failed\n");
1064 mutex_unlock(&ses->server->srv_mutex);
1065 return rc;
1066 }
1067 }
1068 if (!ses->server->session_estab) {
1069 ses->server->sequence_number = 0x2;
1070 ses->server->session_estab = true;
1071 }
1072 mutex_unlock(&ses->server->srv_mutex);
1073
1074 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1075 spin_lock(&GlobalMid_Lock);
1076 ses->status = CifsGood;
1077 ses->need_reconnect = false;
1078 spin_unlock(&GlobalMid_Lock);
1079 return rc;
1080}
1081
1082#ifdef CONFIG_CIFS_UPCALL
1083static void
1084SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1085{
1086 int rc;
1087 struct cifs_ses *ses = sess_data->ses;
1088 struct cifs_spnego_msg *msg;
1089 struct key *spnego_key = NULL;
1090 struct smb2_sess_setup_rsp *rsp = NULL;
1091
1092 rc = SMB2_sess_alloc_buffer(sess_data);
1093 if (rc)
1094 goto out;
1095
1096 spnego_key = cifs_get_spnego_key(ses);
1097 if (IS_ERR(spnego_key)) {
1098 rc = PTR_ERR(spnego_key);
1099 spnego_key = NULL;
1100 goto out;
1101 }
1102
1103 msg = spnego_key->payload.data[0];
1104 /*
1105 * check version field to make sure that cifs.upcall is
1106 * sending us a response in an expected form
1107 */
1108 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1109 cifs_dbg(VFS,
1110 "bad cifs.upcall version. Expected %d got %d",
1111 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1112 rc = -EKEYREJECTED;
1113 goto out_put_spnego_key;
1114 }
1115
1116 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1117 GFP_KERNEL);
1118 if (!ses->auth_key.response) {
1119 cifs_dbg(VFS,
1120 "Kerberos can't allocate (%u bytes) memory",
1121 msg->sesskey_len);
1122 rc = -ENOMEM;
1123 goto out_put_spnego_key;
1124 }
1125 ses->auth_key.len = msg->sesskey_len;
1126
1127 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1128 sess_data->iov[1].iov_len = msg->secblob_len;
1129
1130 rc = SMB2_sess_sendreceive(sess_data);
1131 if (rc)
1132 goto out_put_spnego_key;
1133
1134 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1135 ses->Suid = rsp->sync_hdr.SessionId;
1136
1137 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1138
1139 rc = SMB2_sess_establish_session(sess_data);
1140out_put_spnego_key:
1141 key_invalidate(spnego_key);
1142 key_put(spnego_key);
1143out:
1144 sess_data->result = rc;
1145 sess_data->func = NULL;
1146 SMB2_sess_free_buffer(sess_data);
1147}
1148#else
1149static void
1150SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1151{
1152 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1153 sess_data->result = -EOPNOTSUPP;
1154 sess_data->func = NULL;
1155}
1156#endif
1157
1158static void
1159SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1160
1161static void
1162SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1163{
1164 int rc;
1165 struct cifs_ses *ses = sess_data->ses;
1166 struct smb2_sess_setup_rsp *rsp = NULL;
1167 char *ntlmssp_blob = NULL;
1168 bool use_spnego = false; /* else use raw ntlmssp */
1169 u16 blob_length = 0;
1170
1171 /*
1172 * If memory allocation is successful, caller of this function
1173 * frees it.
1174 */
1175 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1176 if (!ses->ntlmssp) {
1177 rc = -ENOMEM;
1178 goto out_err;
1179 }
1180 ses->ntlmssp->sesskey_per_smbsess = true;
1181
1182 rc = SMB2_sess_alloc_buffer(sess_data);
1183 if (rc)
1184 goto out_err;
1185
1186 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1187 GFP_KERNEL);
1188 if (ntlmssp_blob == NULL) {
1189 rc = -ENOMEM;
1190 goto out;
1191 }
1192
1193 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1194 if (use_spnego) {
1195 /* BB eventually need to add this */
1196 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1197 rc = -EOPNOTSUPP;
1198 goto out;
1199 } else {
1200 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1201 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1202 }
1203 sess_data->iov[1].iov_base = ntlmssp_blob;
1204 sess_data->iov[1].iov_len = blob_length;
1205
1206 rc = SMB2_sess_sendreceive(sess_data);
1207 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1208
1209 /* If true, rc here is expected and not an error */
1210 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1211 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1212 rc = 0;
1213
1214 if (rc)
1215 goto out;
1216
1217 if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1218 le16_to_cpu(rsp->SecurityBufferOffset)) {
1219 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1220 le16_to_cpu(rsp->SecurityBufferOffset));
1221 rc = -EIO;
1222 goto out;
1223 }
1224 rc = decode_ntlmssp_challenge(rsp->Buffer,
1225 le16_to_cpu(rsp->SecurityBufferLength), ses);
1226 if (rc)
1227 goto out;
1228
1229 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1230
1231
1232 ses->Suid = rsp->sync_hdr.SessionId;
1233 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234
1235out:
1236 kfree(ntlmssp_blob);
1237 SMB2_sess_free_buffer(sess_data);
1238 if (!rc) {
1239 sess_data->result = 0;
1240 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1241 return;
1242 }
1243out_err:
1244 kfree(ses->ntlmssp);
1245 ses->ntlmssp = NULL;
1246 sess_data->result = rc;
1247 sess_data->func = NULL;
1248}
1249
1250static void
1251SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1252{
1253 int rc;
1254 struct cifs_ses *ses = sess_data->ses;
1255 struct smb2_sess_setup_req *req;
1256 struct smb2_sess_setup_rsp *rsp = NULL;
1257 unsigned char *ntlmssp_blob = NULL;
1258 bool use_spnego = false; /* else use raw ntlmssp */
1259 u16 blob_length = 0;
1260
1261 rc = SMB2_sess_alloc_buffer(sess_data);
1262 if (rc)
1263 goto out;
1264
1265 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1266 req->sync_hdr.SessionId = ses->Suid;
1267
1268 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1269 sess_data->nls_cp);
1270 if (rc) {
1271 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1272 goto out;
1273 }
1274
1275 if (use_spnego) {
1276 /* BB eventually need to add this */
1277 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1278 rc = -EOPNOTSUPP;
1279 goto out;
1280 }
1281 sess_data->iov[1].iov_base = ntlmssp_blob;
1282 sess_data->iov[1].iov_len = blob_length;
1283
1284 rc = SMB2_sess_sendreceive(sess_data);
1285 if (rc)
1286 goto out;
1287
1288 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1289
1290 ses->Suid = rsp->sync_hdr.SessionId;
1291 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1292
1293 rc = SMB2_sess_establish_session(sess_data);
1294out:
1295 kfree(ntlmssp_blob);
1296 SMB2_sess_free_buffer(sess_data);
1297 kfree(ses->ntlmssp);
1298 ses->ntlmssp = NULL;
1299 sess_data->result = rc;
1300 sess_data->func = NULL;
1301}
1302
1303static int
1304SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1305{
1306 int type;
1307
1308 type = smb2_select_sectype(ses->server, ses->sectype);
1309 cifs_dbg(FYI, "sess setup type %d\n", type);
1310 if (type == Unspecified) {
1311 cifs_dbg(VFS,
1312 "Unable to select appropriate authentication method!");
1313 return -EINVAL;
1314 }
1315
1316 switch (type) {
1317 case Kerberos:
1318 sess_data->func = SMB2_auth_kerberos;
1319 break;
1320 case RawNTLMSSP:
1321 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1322 break;
1323 default:
1324 cifs_dbg(VFS, "secType %d not supported!\n", type);
1325 return -EOPNOTSUPP;
1326 }
1327
1328 return 0;
1329}
1330
1331int
1332SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1333 const struct nls_table *nls_cp)
1334{
1335 int rc = 0;
1336 struct TCP_Server_Info *server = ses->server;
1337 struct SMB2_sess_data *sess_data;
1338
1339 cifs_dbg(FYI, "Session Setup\n");
1340
1341 if (!server) {
1342 WARN(1, "%s: server is NULL!\n", __func__);
1343 return -EIO;
1344 }
1345
1346 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1347 if (!sess_data)
1348 return -ENOMEM;
1349
1350 rc = SMB2_select_sec(ses, sess_data);
1351 if (rc)
1352 goto out;
1353 sess_data->xid = xid;
1354 sess_data->ses = ses;
1355 sess_data->buf0_type = CIFS_NO_BUFFER;
1356 sess_data->nls_cp = (struct nls_table *) nls_cp;
1357 sess_data->previous_session = ses->Suid;
1358
1359 /*
1360 * Initialize the session hash with the server one.
1361 */
1362 memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1363 SMB2_PREAUTH_HASH_SIZE);
1364
1365 while (sess_data->func)
1366 sess_data->func(sess_data);
1367
1368 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1369 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1370 rc = sess_data->result;
1371out:
1372 kfree(sess_data);
1373 return rc;
1374}
1375
1376int
1377SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1378{
1379 struct smb_rqst rqst;
1380 struct smb2_logoff_req *req; /* response is also trivial struct */
1381 int rc = 0;
1382 struct TCP_Server_Info *server;
1383 int flags = 0;
1384 unsigned int total_len;
1385 struct kvec iov[1];
1386 struct kvec rsp_iov;
1387 int resp_buf_type;
1388
1389 cifs_dbg(FYI, "disconnect session %p\n", ses);
1390
1391 if (ses && (ses->server))
1392 server = ses->server;
1393 else
1394 return -EIO;
1395
1396 /* no need to send SMB logoff if uid already closed due to reconnect */
1397 if (ses->need_reconnect)
1398 goto smb2_session_already_dead;
1399
1400 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1401 if (rc)
1402 return rc;
1403
1404 /* since no tcon, smb2_init can not do this, so do here */
1405 req->sync_hdr.SessionId = ses->Suid;
1406
1407 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1408 flags |= CIFS_TRANSFORM_REQ;
1409 else if (server->sign)
1410 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1411
1412 flags |= CIFS_NO_RESP;
1413
1414 iov[0].iov_base = (char *)req;
1415 iov[0].iov_len = total_len;
1416
1417 memset(&rqst, 0, sizeof(struct smb_rqst));
1418 rqst.rq_iov = iov;
1419 rqst.rq_nvec = 1;
1420
1421 rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1422 cifs_small_buf_release(req);
1423 /*
1424 * No tcon so can't do
1425 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1426 */
1427
1428smb2_session_already_dead:
1429 return rc;
1430}
1431
1432static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1433{
1434 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1435}
1436
1437#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1438
1439/* These are similar values to what Windows uses */
1440static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1441{
1442 tcon->max_chunks = 256;
1443 tcon->max_bytes_chunk = 1048576;
1444 tcon->max_bytes_copy = 16777216;
1445}
1446
1447int
1448SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1449 struct cifs_tcon *tcon, const struct nls_table *cp)
1450{
1451 struct smb_rqst rqst;
1452 struct smb2_tree_connect_req *req;
1453 struct smb2_tree_connect_rsp *rsp = NULL;
1454 struct kvec iov[2];
1455 struct kvec rsp_iov = { NULL, 0 };
1456 int rc = 0;
1457 int resp_buftype;
1458 int unc_path_len;
1459 __le16 *unc_path = NULL;
1460 int flags = 0;
1461 unsigned int total_len;
1462
1463 cifs_dbg(FYI, "TCON\n");
1464
1465 if (!(ses->server) || !tree)
1466 return -EIO;
1467
1468 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1469 if (unc_path == NULL)
1470 return -ENOMEM;
1471
1472 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1473 unc_path_len *= 2;
1474 if (unc_path_len < 2) {
1475 kfree(unc_path);
1476 return -EINVAL;
1477 }
1478
1479 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1480 tcon->tid = 0;
1481 atomic_set(&tcon->num_remote_opens, 0);
1482 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1483 &total_len);
1484 if (rc) {
1485 kfree(unc_path);
1486 return rc;
1487 }
1488
1489 if (smb3_encryption_required(tcon))
1490 flags |= CIFS_TRANSFORM_REQ;
1491
1492 iov[0].iov_base = (char *)req;
1493 /* 1 for pad */
1494 iov[0].iov_len = total_len - 1;
1495
1496 /* Testing shows that buffer offset must be at location of Buffer[0] */
1497 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1498 - 1 /* pad */);
1499 req->PathLength = cpu_to_le16(unc_path_len - 2);
1500 iov[1].iov_base = unc_path;
1501 iov[1].iov_len = unc_path_len;
1502
1503 /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1504 if ((ses->server->dialect == SMB311_PROT_ID) &&
1505 !smb3_encryption_required(tcon))
1506 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507
1508 memset(&rqst, 0, sizeof(struct smb_rqst));
1509 rqst.rq_iov = iov;
1510 rqst.rq_nvec = 2;
1511
1512 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1513 cifs_small_buf_release(req);
1514 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1515 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1516 if (rc != 0) {
1517 if (tcon) {
1518 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519 tcon->need_reconnect = true;
1520 }
1521 goto tcon_error_exit;
1522 }
1523
1524 switch (rsp->ShareType) {
1525 case SMB2_SHARE_TYPE_DISK:
1526 cifs_dbg(FYI, "connection to disk share\n");
1527 break;
1528 case SMB2_SHARE_TYPE_PIPE:
1529 tcon->pipe = true;
1530 cifs_dbg(FYI, "connection to pipe share\n");
1531 break;
1532 case SMB2_SHARE_TYPE_PRINT:
1533 tcon->print = true;
1534 cifs_dbg(FYI, "connection to printer\n");
1535 break;
1536 default:
1537 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538 rc = -EOPNOTSUPP;
1539 goto tcon_error_exit;
1540 }
1541
1542 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545 tcon->tidStatus = CifsGood;
1546 tcon->need_reconnect = false;
1547 tcon->tid = rsp->sync_hdr.TreeId;
1548 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549
1550 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553
1554 if (tcon->seal &&
1555 !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557
1558 init_copy_chunk_defaults(tcon);
1559 if (tcon->ses->server->ops->validate_negotiate)
1560 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561tcon_exit:
1562
1563 free_rsp_buf(resp_buftype, rsp);
1564 kfree(unc_path);
1565 return rc;
1566
1567tcon_error_exit:
1568 if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1569 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1570 }
1571 goto tcon_exit;
1572}
1573
1574int
1575SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1576{
1577 struct smb_rqst rqst;
1578 struct smb2_tree_disconnect_req *req; /* response is trivial */
1579 int rc = 0;
1580 struct cifs_ses *ses = tcon->ses;
1581 int flags = 0;
1582 unsigned int total_len;
1583 struct kvec iov[1];
1584 struct kvec rsp_iov;
1585 int resp_buf_type;
1586
1587 cifs_dbg(FYI, "Tree Disconnect\n");
1588
1589 if (!ses || !(ses->server))
1590 return -EIO;
1591
1592 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1593 return 0;
1594
1595 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1596 &total_len);
1597 if (rc)
1598 return rc;
1599
1600 if (smb3_encryption_required(tcon))
1601 flags |= CIFS_TRANSFORM_REQ;
1602
1603 flags |= CIFS_NO_RESP;
1604
1605 iov[0].iov_base = (char *)req;
1606 iov[0].iov_len = total_len;
1607
1608 memset(&rqst, 0, sizeof(struct smb_rqst));
1609 rqst.rq_iov = iov;
1610 rqst.rq_nvec = 1;
1611
1612 rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1613 cifs_small_buf_release(req);
1614 if (rc)
1615 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1616
1617 return rc;
1618}
1619
1620
1621static struct create_durable *
1622create_durable_buf(void)
1623{
1624 struct create_durable *buf;
1625
1626 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1627 if (!buf)
1628 return NULL;
1629
1630 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1631 (struct create_durable, Data));
1632 buf->ccontext.DataLength = cpu_to_le32(16);
1633 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1634 (struct create_durable, Name));
1635 buf->ccontext.NameLength = cpu_to_le16(4);
1636 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1637 buf->Name[0] = 'D';
1638 buf->Name[1] = 'H';
1639 buf->Name[2] = 'n';
1640 buf->Name[3] = 'Q';
1641 return buf;
1642}
1643
1644static struct create_durable *
1645create_reconnect_durable_buf(struct cifs_fid *fid)
1646{
1647 struct create_durable *buf;
1648
1649 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1650 if (!buf)
1651 return NULL;
1652
1653 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1654 (struct create_durable, Data));
1655 buf->ccontext.DataLength = cpu_to_le32(16);
1656 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1657 (struct create_durable, Name));
1658 buf->ccontext.NameLength = cpu_to_le16(4);
1659 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1660 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1661 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1662 buf->Name[0] = 'D';
1663 buf->Name[1] = 'H';
1664 buf->Name[2] = 'n';
1665 buf->Name[3] = 'C';
1666 return buf;
1667}
1668
1669static __u8
1670parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1671 unsigned int *epoch, char *lease_key)
1672{
1673 char *data_offset;
1674 struct create_context *cc;
1675 unsigned int next;
1676 unsigned int remaining;
1677 char *name;
1678
1679 data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1680 remaining = le32_to_cpu(rsp->CreateContextsLength);
1681 cc = (struct create_context *)data_offset;
1682 while (remaining >= sizeof(struct create_context)) {
1683 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1684 if (le16_to_cpu(cc->NameLength) == 4 &&
1685 strncmp(name, "RqLs", 4) == 0)
1686 return server->ops->parse_lease_buf(cc, epoch,
1687 lease_key);
1688
1689 next = le32_to_cpu(cc->Next);
1690 if (!next)
1691 break;
1692 remaining -= next;
1693 cc = (struct create_context *)((char *)cc + next);
1694 }
1695
1696 return 0;
1697}
1698
1699static int
1700add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1701 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1702{
1703 struct smb2_create_req *req = iov[0].iov_base;
1704 unsigned int num = *num_iovec;
1705
1706 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1707 if (iov[num].iov_base == NULL)
1708 return -ENOMEM;
1709 iov[num].iov_len = server->vals->create_lease_size;
1710 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1711 if (!req->CreateContextsOffset)
1712 req->CreateContextsOffset = cpu_to_le32(
1713 sizeof(struct smb2_create_req) +
1714 iov[num - 1].iov_len);
1715 le32_add_cpu(&req->CreateContextsLength,
1716 server->vals->create_lease_size);
1717 *num_iovec = num + 1;
1718 return 0;
1719}
1720
1721static struct create_durable_v2 *
1722create_durable_v2_buf(struct cifs_fid *pfid)
1723{
1724 struct create_durable_v2 *buf;
1725
1726 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1727 if (!buf)
1728 return NULL;
1729
1730 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1731 (struct create_durable_v2, dcontext));
1732 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1733 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1734 (struct create_durable_v2, Name));
1735 buf->ccontext.NameLength = cpu_to_le16(4);
1736
1737 buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1738 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1739 generate_random_uuid(buf->dcontext.CreateGuid);
1740 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1741
1742 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1743 buf->Name[0] = 'D';
1744 buf->Name[1] = 'H';
1745 buf->Name[2] = '2';
1746 buf->Name[3] = 'Q';
1747 return buf;
1748}
1749
1750static struct create_durable_handle_reconnect_v2 *
1751create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1752{
1753 struct create_durable_handle_reconnect_v2 *buf;
1754
1755 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1756 GFP_KERNEL);
1757 if (!buf)
1758 return NULL;
1759
1760 buf->ccontext.DataOffset =
1761 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1762 dcontext));
1763 buf->ccontext.DataLength =
1764 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1765 buf->ccontext.NameOffset =
1766 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1767 Name));
1768 buf->ccontext.NameLength = cpu_to_le16(4);
1769
1770 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1771 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1772 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1773 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1774
1775 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1776 buf->Name[0] = 'D';
1777 buf->Name[1] = 'H';
1778 buf->Name[2] = '2';
1779 buf->Name[3] = 'C';
1780 return buf;
1781}
1782
1783static int
1784add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1785 struct cifs_open_parms *oparms)
1786{
1787 struct smb2_create_req *req = iov[0].iov_base;
1788 unsigned int num = *num_iovec;
1789
1790 iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1791 if (iov[num].iov_base == NULL)
1792 return -ENOMEM;
1793 iov[num].iov_len = sizeof(struct create_durable_v2);
1794 if (!req->CreateContextsOffset)
1795 req->CreateContextsOffset =
1796 cpu_to_le32(sizeof(struct smb2_create_req) +
1797 iov[1].iov_len);
1798 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1799 *num_iovec = num + 1;
1800 return 0;
1801}
1802
1803static int
1804add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1805 struct cifs_open_parms *oparms)
1806{
1807 struct smb2_create_req *req = iov[0].iov_base;
1808 unsigned int num = *num_iovec;
1809
1810 /* indicate that we don't need to relock the file */
1811 oparms->reconnect = false;
1812
1813 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1814 if (iov[num].iov_base == NULL)
1815 return -ENOMEM;
1816 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1817 if (!req->CreateContextsOffset)
1818 req->CreateContextsOffset =
1819 cpu_to_le32(sizeof(struct smb2_create_req) +
1820 iov[1].iov_len);
1821 le32_add_cpu(&req->CreateContextsLength,
1822 sizeof(struct create_durable_handle_reconnect_v2));
1823 *num_iovec = num + 1;
1824 return 0;
1825}
1826
1827static int
1828add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1829 struct cifs_open_parms *oparms, bool use_persistent)
1830{
1831 struct smb2_create_req *req = iov[0].iov_base;
1832 unsigned int num = *num_iovec;
1833
1834 if (use_persistent) {
1835 if (oparms->reconnect)
1836 return add_durable_reconnect_v2_context(iov, num_iovec,
1837 oparms);
1838 else
1839 return add_durable_v2_context(iov, num_iovec, oparms);
1840 }
1841
1842 if (oparms->reconnect) {
1843 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1844 /* indicate that we don't need to relock the file */
1845 oparms->reconnect = false;
1846 } else
1847 iov[num].iov_base = create_durable_buf();
1848 if (iov[num].iov_base == NULL)
1849 return -ENOMEM;
1850 iov[num].iov_len = sizeof(struct create_durable);
1851 if (!req->CreateContextsOffset)
1852 req->CreateContextsOffset =
1853 cpu_to_le32(sizeof(struct smb2_create_req) +
1854 iov[1].iov_len);
1855 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1856 *num_iovec = num + 1;
1857 return 0;
1858}
1859
1860/* See MS-SMB2 2.2.13.2.7 */
1861static struct crt_twarp_ctxt *
1862create_twarp_buf(__u64 timewarp)
1863{
1864 struct crt_twarp_ctxt *buf;
1865
1866 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1867 if (!buf)
1868 return NULL;
1869
1870 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1871 (struct crt_twarp_ctxt, Timestamp));
1872 buf->ccontext.DataLength = cpu_to_le32(8);
1873 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1874 (struct crt_twarp_ctxt, Name));
1875 buf->ccontext.NameLength = cpu_to_le16(4);
1876 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1877 buf->Name[0] = 'T';
1878 buf->Name[1] = 'W';
1879 buf->Name[2] = 'r';
1880 buf->Name[3] = 'p';
1881 buf->Timestamp = cpu_to_le64(timewarp);
1882 return buf;
1883}
1884
1885/* See MS-SMB2 2.2.13.2.7 */
1886static int
1887add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1888{
1889 struct smb2_create_req *req = iov[0].iov_base;
1890 unsigned int num = *num_iovec;
1891
1892 iov[num].iov_base = create_twarp_buf(timewarp);
1893 if (iov[num].iov_base == NULL)
1894 return -ENOMEM;
1895 iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1896 if (!req->CreateContextsOffset)
1897 req->CreateContextsOffset = cpu_to_le32(
1898 sizeof(struct smb2_create_req) +
1899 iov[num - 1].iov_len);
1900 le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1901 *num_iovec = num + 1;
1902 return 0;
1903}
1904
1905static int
1906alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1907 const char *treename, const __le16 *path)
1908{
1909 int treename_len, path_len;
1910 struct nls_table *cp;
1911 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1912
1913 /*
1914 * skip leading "\\"
1915 */
1916 treename_len = strlen(treename);
1917 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1918 return -EINVAL;
1919
1920 treename += 2;
1921 treename_len -= 2;
1922
1923 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1924
1925 /*
1926 * make room for one path separator between the treename and
1927 * path
1928 */
1929 *out_len = treename_len + 1 + path_len;
1930
1931 /*
1932 * final path needs to be null-terminated UTF16 with a
1933 * size aligned to 8
1934 */
1935
1936 *out_size = roundup((*out_len+1)*2, 8);
1937 *out_path = kzalloc(*out_size, GFP_KERNEL);
1938 if (!*out_path)
1939 return -ENOMEM;
1940
1941 cp = load_nls_default();
1942 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1943 UniStrcat(*out_path, sep);
1944 UniStrcat(*out_path, path);
1945 unload_nls(cp);
1946
1947 return 0;
1948}
1949
1950int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1951 umode_t mode, struct cifs_tcon *tcon,
1952 const char *full_path,
1953 struct cifs_sb_info *cifs_sb)
1954{
1955 struct smb_rqst rqst;
1956 struct smb2_create_req *req;
1957 struct smb2_create_rsp *rsp = NULL;
1958 struct TCP_Server_Info *server;
1959 struct cifs_ses *ses = tcon->ses;
1960 struct kvec iov[3]; /* make sure at least one for each open context */
1961 struct kvec rsp_iov = {NULL, 0};
1962 int resp_buftype;
1963 int uni_path_len;
1964 __le16 *copy_path = NULL;
1965 int copy_size;
1966 int rc = 0;
1967 unsigned int n_iov = 2;
1968 __u32 file_attributes = 0;
1969 char *pc_buf = NULL;
1970 int flags = 0;
1971 unsigned int total_len;
1972 __le16 *utf16_path = NULL;
1973
1974 cifs_dbg(FYI, "mkdir\n");
1975
1976 /* resource #1: path allocation */
1977 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1978 if (!utf16_path)
1979 return -ENOMEM;
1980
1981 if (ses && (ses->server))
1982 server = ses->server;
1983 else {
1984 rc = -EIO;
1985 goto err_free_path;
1986 }
1987
1988 /* resource #2: request */
1989 rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1990 if (rc)
1991 goto err_free_path;
1992
1993
1994 if (smb3_encryption_required(tcon))
1995 flags |= CIFS_TRANSFORM_REQ;
1996
1997 req->ImpersonationLevel = IL_IMPERSONATION;
1998 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1999 /* File attributes ignored on open (used in create though) */
2000 req->FileAttributes = cpu_to_le32(file_attributes);
2001 req->ShareAccess = FILE_SHARE_ALL_LE;
2002 req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2003 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2004
2005 iov[0].iov_base = (char *)req;
2006 /* -1 since last byte is buf[0] which is sent below (path) */
2007 iov[0].iov_len = total_len - 1;
2008
2009 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2010
2011 /* [MS-SMB2] 2.2.13 NameOffset:
2012 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2013 * the SMB2 header, the file name includes a prefix that will
2014 * be processed during DFS name normalization as specified in
2015 * section 3.3.5.9. Otherwise, the file name is relative to
2016 * the share that is identified by the TreeId in the SMB2
2017 * header.
2018 */
2019 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2020 int name_len;
2021
2022 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2023 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2024 &name_len,
2025 tcon->treeName, utf16_path);
2026 if (rc)
2027 goto err_free_req;
2028
2029 req->NameLength = cpu_to_le16(name_len * 2);
2030 uni_path_len = copy_size;
2031 /* free before overwriting resource */
2032 kfree(utf16_path);
2033 utf16_path = copy_path;
2034 } else {
2035 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2036 /* MUST set path len (NameLength) to 0 opening root of share */
2037 req->NameLength = cpu_to_le16(uni_path_len - 2);
2038 if (uni_path_len % 8 != 0) {
2039 copy_size = roundup(uni_path_len, 8);
2040 copy_path = kzalloc(copy_size, GFP_KERNEL);
2041 if (!copy_path) {
2042 rc = -ENOMEM;
2043 goto err_free_req;
2044 }
2045 memcpy((char *)copy_path, (const char *)utf16_path,
2046 uni_path_len);
2047 uni_path_len = copy_size;
2048 /* free before overwriting resource */
2049 kfree(utf16_path);
2050 utf16_path = copy_path;
2051 }
2052 }
2053
2054 iov[1].iov_len = uni_path_len;
2055 iov[1].iov_base = utf16_path;
2056 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2057
2058 if (tcon->posix_extensions) {
2059 /* resource #3: posix buf */
2060 rc = add_posix_context(iov, &n_iov, mode);
2061 if (rc)
2062 goto err_free_req;
2063 pc_buf = iov[n_iov-1].iov_base;
2064 }
2065
2066
2067 memset(&rqst, 0, sizeof(struct smb_rqst));
2068 rqst.rq_iov = iov;
2069 rqst.rq_nvec = n_iov;
2070
2071 /* resource #4: response buffer */
2072 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2073 if (rc) {
2074 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2075 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2076 CREATE_NOT_FILE,
2077 FILE_WRITE_ATTRIBUTES, rc);
2078 goto err_free_rsp_buf;
2079 }
2080
2081 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2082 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2083 ses->Suid, CREATE_NOT_FILE,
2084 FILE_WRITE_ATTRIBUTES);
2085
2086 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2087
2088 /* Eventually save off posix specific response info and timestaps */
2089
2090err_free_rsp_buf:
2091 free_rsp_buf(resp_buftype, rsp);
2092 kfree(pc_buf);
2093err_free_req:
2094 cifs_small_buf_release(req);
2095err_free_path:
2096 kfree(utf16_path);
2097 return rc;
2098}
2099
2100int
2101SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2102 struct cifs_open_parms *oparms, __le16 *path)
2103{
2104 struct TCP_Server_Info *server = tcon->ses->server;
2105 struct smb2_create_req *req;
2106 unsigned int n_iov = 2;
2107 __u32 file_attributes = 0;
2108 int copy_size;
2109 int uni_path_len;
2110 unsigned int total_len;
2111 struct kvec *iov = rqst->rq_iov;
2112 __le16 *copy_path;
2113 int rc;
2114
2115 rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2116 if (rc)
2117 return rc;
2118
2119 iov[0].iov_base = (char *)req;
2120 /* -1 since last byte is buf[0] which is sent below (path) */
2121 iov[0].iov_len = total_len - 1;
2122
2123 if (oparms->create_options & CREATE_OPTION_READONLY)
2124 file_attributes |= ATTR_READONLY;
2125 if (oparms->create_options & CREATE_OPTION_SPECIAL)
2126 file_attributes |= ATTR_SYSTEM;
2127
2128 req->ImpersonationLevel = IL_IMPERSONATION;
2129 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2130 /* File attributes ignored on open (used in create though) */
2131 req->FileAttributes = cpu_to_le32(file_attributes);
2132 req->ShareAccess = FILE_SHARE_ALL_LE;
2133 req->CreateDisposition = cpu_to_le32(oparms->disposition);
2134 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2135 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2136
2137 /* [MS-SMB2] 2.2.13 NameOffset:
2138 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2139 * the SMB2 header, the file name includes a prefix that will
2140 * be processed during DFS name normalization as specified in
2141 * section 3.3.5.9. Otherwise, the file name is relative to
2142 * the share that is identified by the TreeId in the SMB2
2143 * header.
2144 */
2145 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2146 int name_len;
2147
2148 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2149 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2150 &name_len,
2151 tcon->treeName, path);
2152 if (rc)
2153 return rc;
2154 req->NameLength = cpu_to_le16(name_len * 2);
2155 uni_path_len = copy_size;
2156 path = copy_path;
2157 } else {
2158 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2159 /* MUST set path len (NameLength) to 0 opening root of share */
2160 req->NameLength = cpu_to_le16(uni_path_len - 2);
2161 copy_size = uni_path_len;
2162 if (copy_size % 8 != 0)
2163 copy_size = roundup(copy_size, 8);
2164 copy_path = kzalloc(copy_size, GFP_KERNEL);
2165 if (!copy_path)
2166 return -ENOMEM;
2167 memcpy((char *)copy_path, (const char *)path,
2168 uni_path_len);
2169 uni_path_len = copy_size;
2170 path = copy_path;
2171 }
2172
2173 iov[1].iov_len = uni_path_len;
2174 iov[1].iov_base = path;
2175
2176 if (!server->oplocks)
2177 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2178
2179 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2180 *oplock == SMB2_OPLOCK_LEVEL_NONE)
2181 req->RequestedOplockLevel = *oplock;
2182 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2183 (oparms->create_options & CREATE_NOT_FILE))
2184 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2185 else {
2186 rc = add_lease_context(server, iov, &n_iov,
2187 oparms->fid->lease_key, oplock);
2188 if (rc)
2189 return rc;
2190 }
2191
2192 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2193 /* need to set Next field of lease context if we request it */
2194 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2195 struct create_context *ccontext =
2196 (struct create_context *)iov[n_iov-1].iov_base;
2197 ccontext->Next =
2198 cpu_to_le32(server->vals->create_lease_size);
2199 }
2200
2201 rc = add_durable_context(iov, &n_iov, oparms,
2202 tcon->use_persistent);
2203 if (rc)
2204 return rc;
2205 }
2206
2207 if (tcon->posix_extensions) {
2208 if (n_iov > 2) {
2209 struct create_context *ccontext =
2210 (struct create_context *)iov[n_iov-1].iov_base;
2211 ccontext->Next =
2212 cpu_to_le32(iov[n_iov-1].iov_len);
2213 }
2214
2215 rc = add_posix_context(iov, &n_iov, oparms->mode);
2216 if (rc)
2217 return rc;
2218 }
2219
2220 if (tcon->snapshot_time) {
2221 cifs_dbg(FYI, "adding snapshot context\n");
2222 if (n_iov > 2) {
2223 struct create_context *ccontext =
2224 (struct create_context *)iov[n_iov-1].iov_base;
2225 ccontext->Next =
2226 cpu_to_le32(iov[n_iov-1].iov_len);
2227 }
2228
2229 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2230 if (rc)
2231 return rc;
2232 }
2233
2234
2235 rqst->rq_nvec = n_iov;
2236 return 0;
2237}
2238
2239/* rq_iov[0] is the request and is released by cifs_small_buf_release().
2240 * All other vectors are freed by kfree().
2241 */
2242void
2243SMB2_open_free(struct smb_rqst *rqst)
2244{
2245 int i;
2246
2247 if (rqst && rqst->rq_iov) {
2248 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2249 for (i = 1; i < rqst->rq_nvec; i++)
2250 if (rqst->rq_iov[i].iov_base != smb2_padding)
2251 kfree(rqst->rq_iov[i].iov_base);
2252 }
2253}
2254
2255int
2256SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2257 __u8 *oplock, struct smb2_file_all_info *buf,
2258 struct kvec *err_iov, int *buftype)
2259{
2260 struct smb_rqst rqst;
2261 struct smb2_create_rsp *rsp = NULL;
2262 struct TCP_Server_Info *server;
2263 struct cifs_tcon *tcon = oparms->tcon;
2264 struct cifs_ses *ses = tcon->ses;
2265 struct kvec iov[SMB2_CREATE_IOV_SIZE];
2266 struct kvec rsp_iov = {NULL, 0};
2267 int resp_buftype = CIFS_NO_BUFFER;
2268 int rc = 0;
2269 int flags = 0;
2270
2271 cifs_dbg(FYI, "create/open\n");
2272 if (ses && (ses->server))
2273 server = ses->server;
2274 else
2275 return -EIO;
2276
2277 if (smb3_encryption_required(tcon))
2278 flags |= CIFS_TRANSFORM_REQ;
2279
2280 memset(&rqst, 0, sizeof(struct smb_rqst));
2281 memset(&iov, 0, sizeof(iov));
2282 rqst.rq_iov = iov;
2283 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2284
2285 rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2286 if (rc)
2287 goto creat_exit;
2288
2289 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2290 &rsp_iov);
2291 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2292
2293 if (rc != 0) {
2294 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2295 if (err_iov && rsp) {
2296 *err_iov = rsp_iov;
2297 *buftype = resp_buftype;
2298 resp_buftype = CIFS_NO_BUFFER;
2299 rsp = NULL;
2300 }
2301 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2302 oparms->create_options, oparms->desired_access, rc);
2303 goto creat_exit;
2304 } else
2305 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2306 ses->Suid, oparms->create_options,
2307 oparms->desired_access);
2308
2309 atomic_inc(&tcon->num_remote_opens);
2310 oparms->fid->persistent_fid = rsp->PersistentFileId;
2311 oparms->fid->volatile_fid = rsp->VolatileFileId;
2312#ifdef CONFIG_CIFS_DEBUG2
2313 oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2314#endif /* CIFS_DEBUG2 */
2315
2316 if (buf) {
2317 memcpy(buf, &rsp->CreationTime, 32);
2318 buf->AllocationSize = rsp->AllocationSize;
2319 buf->EndOfFile = rsp->EndofFile;
2320 buf->Attributes = rsp->FileAttributes;
2321 buf->NumberOfLinks = cpu_to_le32(1);
2322 buf->DeletePending = 0;
2323 }
2324
2325 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2326 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2327 oparms->fid->lease_key);
2328 else
2329 *oplock = rsp->OplockLevel;
2330creat_exit:
2331 SMB2_open_free(&rqst);
2332 free_rsp_buf(resp_buftype, rsp);
2333 return rc;
2334}
2335
2336/*
2337 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
2338 */
2339int
2340SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2341 u64 volatile_fid, u32 opcode, bool is_fsctl,
2342 char *in_data, u32 indatalen,
2343 char **out_data, u32 *plen /* returned data len */)
2344{
2345 struct smb_rqst rqst;
2346 struct smb2_ioctl_req *req;
2347 struct smb2_ioctl_rsp *rsp;
2348 struct cifs_ses *ses;
2349 struct kvec iov[2];
2350 struct kvec rsp_iov;
2351 int resp_buftype;
2352 int n_iov;
2353 int rc = 0;
2354 int flags = 0;
2355 unsigned int total_len;
2356
2357 cifs_dbg(FYI, "SMB2 IOCTL\n");
2358
2359 if (out_data != NULL)
2360 *out_data = NULL;
2361
2362 /* zero out returned data len, in case of error */
2363 if (plen)
2364 *plen = 0;
2365
2366 if (tcon)
2367 ses = tcon->ses;
2368 else
2369 return -EIO;
2370
2371 if (!ses || !(ses->server))
2372 return -EIO;
2373
2374 rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2375 if (rc)
2376 return rc;
2377
2378 if (smb3_encryption_required(tcon))
2379 flags |= CIFS_TRANSFORM_REQ;
2380
2381 req->CtlCode = cpu_to_le32(opcode);
2382 req->PersistentFileId = persistent_fid;
2383 req->VolatileFileId = volatile_fid;
2384
2385 if (indatalen) {
2386 req->InputCount = cpu_to_le32(indatalen);
2387 /* do not set InputOffset if no input data */
2388 req->InputOffset =
2389 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2390 iov[1].iov_base = in_data;
2391 iov[1].iov_len = indatalen;
2392 n_iov = 2;
2393 } else
2394 n_iov = 1;
2395
2396 req->OutputOffset = 0;
2397 req->OutputCount = 0; /* MBZ */
2398
2399 /*
2400 * Could increase MaxOutputResponse, but that would require more
2401 * than one credit. Windows typically sets this smaller, but for some
2402 * ioctls it may be useful to allow server to send more. No point
2403 * limiting what the server can send as long as fits in one credit
2404 * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2405 * (by default, note that it can be overridden to make max larger)
2406 * in responses (except for read responses which can be bigger.
2407 * We may want to bump this limit up
2408 */
2409 req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2410
2411 if (is_fsctl)
2412 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2413 else
2414 req->Flags = 0;
2415
2416 iov[0].iov_base = (char *)req;
2417
2418 /*
2419 * If no input data, the size of ioctl struct in
2420 * protocol spec still includes a 1 byte data buffer,
2421 * but if input data passed to ioctl, we do not
2422 * want to double count this, so we do not send
2423 * the dummy one byte of data in iovec[0] if sending
2424 * input data (in iovec[1]).
2425 */
2426
2427 if (indatalen) {
2428 iov[0].iov_len = total_len - 1;
2429 } else
2430 iov[0].iov_len = total_len;
2431
2432 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2433 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2434 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2435
2436 memset(&rqst, 0, sizeof(struct smb_rqst));
2437 rqst.rq_iov = iov;
2438 rqst.rq_nvec = n_iov;
2439
2440 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2441 &rsp_iov);
2442 cifs_small_buf_release(req);
2443 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2444
2445 if (rc != 0)
2446 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2447 ses->Suid, 0, opcode, rc);
2448
2449 if ((rc != 0) && (rc != -EINVAL)) {
2450 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2451 goto ioctl_exit;
2452 } else if (rc == -EINVAL) {
2453 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2454 (opcode != FSCTL_SRV_COPYCHUNK)) {
2455 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2456 goto ioctl_exit;
2457 }
2458 }
2459
2460 /* check if caller wants to look at return data or just return rc */
2461 if ((plen == NULL) || (out_data == NULL))
2462 goto ioctl_exit;
2463
2464 *plen = le32_to_cpu(rsp->OutputCount);
2465
2466 /* We check for obvious errors in the output buffer length and offset */
2467 if (*plen == 0)
2468 goto ioctl_exit; /* server returned no data */
2469 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2470 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2471 *plen = 0;
2472 rc = -EIO;
2473 goto ioctl_exit;
2474 }
2475
2476 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2477 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2478 le32_to_cpu(rsp->OutputOffset));
2479 *plen = 0;
2480 rc = -EIO;
2481 goto ioctl_exit;
2482 }
2483
2484 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2485 *plen, GFP_KERNEL);
2486 if (*out_data == NULL) {
2487 rc = -ENOMEM;
2488 goto ioctl_exit;
2489 }
2490
2491ioctl_exit:
2492 free_rsp_buf(resp_buftype, rsp);
2493 return rc;
2494}
2495
2496/*
2497 * Individual callers to ioctl worker function follow
2498 */
2499
2500int
2501SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2502 u64 persistent_fid, u64 volatile_fid)
2503{
2504 int rc;
2505 struct compress_ioctl fsctl_input;
2506 char *ret_data = NULL;
2507
2508 fsctl_input.CompressionState =
2509 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2510
2511 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2512 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2513 (char *)&fsctl_input /* data input */,
2514 2 /* in data len */, &ret_data /* out data */, NULL);
2515
2516 cifs_dbg(FYI, "set compression rc %d\n", rc);
2517
2518 return rc;
2519}
2520
2521int
2522SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2523 u64 persistent_fid, u64 volatile_fid)
2524{
2525 struct smb2_close_req *req;
2526 struct kvec *iov = rqst->rq_iov;
2527 unsigned int total_len;
2528 int rc;
2529
2530 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2531 if (rc)
2532 return rc;
2533
2534 req->PersistentFileId = persistent_fid;
2535 req->VolatileFileId = volatile_fid;
2536 iov[0].iov_base = (char *)req;
2537 iov[0].iov_len = total_len;
2538
2539 return 0;
2540}
2541
2542void
2543SMB2_close_free(struct smb_rqst *rqst)
2544{
2545 if (rqst && rqst->rq_iov)
2546 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2547}
2548
2549int
2550SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2551 u64 persistent_fid, u64 volatile_fid, int flags)
2552{
2553 struct smb_rqst rqst;
2554 struct smb2_close_rsp *rsp = NULL;
2555 struct cifs_ses *ses = tcon->ses;
2556 struct kvec iov[1];
2557 struct kvec rsp_iov;
2558 int resp_buftype = CIFS_NO_BUFFER;
2559 int rc = 0;
2560
2561 cifs_dbg(FYI, "Close\n");
2562
2563 if (!ses || !(ses->server))
2564 return -EIO;
2565
2566 if (smb3_encryption_required(tcon))
2567 flags |= CIFS_TRANSFORM_REQ;
2568
2569 memset(&rqst, 0, sizeof(struct smb_rqst));
2570 memset(&iov, 0, sizeof(iov));
2571 rqst.rq_iov = iov;
2572 rqst.rq_nvec = 1;
2573
2574 rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2575 if (rc)
2576 goto close_exit;
2577
2578 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2579 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2580
2581 if (rc != 0) {
2582 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2583 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2584 rc);
2585 goto close_exit;
2586 }
2587
2588 atomic_dec(&tcon->num_remote_opens);
2589
2590 /* BB FIXME - decode close response, update inode for caching */
2591
2592close_exit:
2593 SMB2_close_free(&rqst);
2594 free_rsp_buf(resp_buftype, rsp);
2595 return rc;
2596}
2597
2598int
2599SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2600 u64 persistent_fid, u64 volatile_fid)
2601{
2602 return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2603}
2604
2605int
2606smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2607 struct kvec *iov, unsigned int min_buf_size)
2608{
2609 unsigned int smb_len = iov->iov_len;
2610 char *end_of_smb = smb_len + (char *)iov->iov_base;
2611 char *begin_of_buf = offset + (char *)iov->iov_base;
2612 char *end_of_buf = begin_of_buf + buffer_length;
2613
2614
2615 if (buffer_length < min_buf_size) {
2616 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2617 buffer_length, min_buf_size);
2618 return -EINVAL;
2619 }
2620
2621 /* check if beyond RFC1001 maximum length */
2622 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2623 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2624 buffer_length, smb_len);
2625 return -EINVAL;
2626 }
2627
2628 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2629 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2630 return -EINVAL;
2631 }
2632
2633 return 0;
2634}
2635
2636/*
2637 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2638 * Caller must free buffer.
2639 */
2640int
2641smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2642 struct kvec *iov, unsigned int minbufsize,
2643 char *data)
2644{
2645 char *begin_of_buf = offset + (char *)iov->iov_base;
2646 int rc;
2647
2648 if (!data)
2649 return -EINVAL;
2650
2651 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2652 if (rc)
2653 return rc;
2654
2655 memcpy(data, begin_of_buf, buffer_length);
2656
2657 return 0;
2658}
2659
2660int
2661SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2662 u64 persistent_fid, u64 volatile_fid,
2663 u8 info_class, u8 info_type, u32 additional_info,
2664 size_t output_len, size_t input_len, void *input)
2665{
2666 struct smb2_query_info_req *req;
2667 struct kvec *iov = rqst->rq_iov;
2668 unsigned int total_len;
2669 int rc;
2670
2671 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2672 &total_len);
2673 if (rc)
2674 return rc;
2675
2676 req->InfoType = info_type;
2677 req->FileInfoClass = info_class;
2678 req->PersistentFileId = persistent_fid;
2679 req->VolatileFileId = volatile_fid;
2680 req->AdditionalInformation = cpu_to_le32(additional_info);
2681
2682 req->OutputBufferLength = cpu_to_le32(output_len);
2683 if (input_len) {
2684 req->InputBufferLength = cpu_to_le32(input_len);
2685 /* total_len for smb query request never close to le16 max */
2686 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2687 memcpy(req->Buffer, input, input_len);
2688 }
2689
2690 iov[0].iov_base = (char *)req;
2691 /* 1 for Buffer */
2692 iov[0].iov_len = total_len - 1 + input_len;
2693 return 0;
2694}
2695
2696void
2697SMB2_query_info_free(struct smb_rqst *rqst)
2698{
2699 if (rqst && rqst->rq_iov)
2700 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2701}
2702
2703static int
2704query_info(const unsigned int xid, struct cifs_tcon *tcon,
2705 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2706 u32 additional_info, size_t output_len, size_t min_len, void **data,
2707 u32 *dlen)
2708{
2709 struct smb_rqst rqst;
2710 struct smb2_query_info_rsp *rsp = NULL;
2711 struct kvec iov[1];
2712 struct kvec rsp_iov;
2713 int rc = 0;
2714 int resp_buftype = CIFS_NO_BUFFER;
2715 struct cifs_ses *ses = tcon->ses;
2716 int flags = 0;
2717
2718 cifs_dbg(FYI, "Query Info\n");
2719
2720 if (!ses || !(ses->server))
2721 return -EIO;
2722
2723 if (smb3_encryption_required(tcon))
2724 flags |= CIFS_TRANSFORM_REQ;
2725
2726 memset(&rqst, 0, sizeof(struct smb_rqst));
2727 memset(&iov, 0, sizeof(iov));
2728 rqst.rq_iov = iov;
2729 rqst.rq_nvec = 1;
2730
2731 rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2732 info_class, info_type, additional_info,
2733 output_len, 0, NULL);
2734 if (rc)
2735 goto qinf_exit;
2736
2737 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2738 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2739
2740 if (rc) {
2741 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2742 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2743 ses->Suid, info_class, (__u32)info_type, rc);
2744 goto qinf_exit;
2745 }
2746
2747 if (dlen) {
2748 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2749 if (!*data) {
2750 *data = kmalloc(*dlen, GFP_KERNEL);
2751 if (!*data) {
2752 cifs_dbg(VFS,
2753 "Error %d allocating memory for acl\n",
2754 rc);
2755 *dlen = 0;
2756 goto qinf_exit;
2757 }
2758 }
2759 }
2760
2761 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2762 le32_to_cpu(rsp->OutputBufferLength),
2763 &rsp_iov, min_len, *data);
2764
2765qinf_exit:
2766 SMB2_query_info_free(&rqst);
2767 free_rsp_buf(resp_buftype, rsp);
2768 return rc;
2769}
2770
2771int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2772 u64 persistent_fid, u64 volatile_fid,
2773 int ea_buf_size, struct smb2_file_full_ea_info *data)
2774{
2775 return query_info(xid, tcon, persistent_fid, volatile_fid,
2776 FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2777 ea_buf_size,
2778 sizeof(struct smb2_file_full_ea_info),
2779 (void **)&data,
2780 NULL);
2781}
2782
2783int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2784 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2785{
2786 return query_info(xid, tcon, persistent_fid, volatile_fid,
2787 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2788 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2789 sizeof(struct smb2_file_all_info), (void **)&data,
2790 NULL);
2791}
2792
2793int
2794SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2795 u64 persistent_fid, u64 volatile_fid,
2796 void **data, u32 *plen)
2797{
2798 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2799 *plen = 0;
2800
2801 return query_info(xid, tcon, persistent_fid, volatile_fid,
2802 0, SMB2_O_INFO_SECURITY, additional_info,
2803 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2804}
2805
2806int
2807SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2808 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2809{
2810 return query_info(xid, tcon, persistent_fid, volatile_fid,
2811 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2812 sizeof(struct smb2_file_internal_info),
2813 sizeof(struct smb2_file_internal_info),
2814 (void **)&uniqueid, NULL);
2815}
2816
2817/*
2818 * This is a no-op for now. We're not really interested in the reply, but
2819 * rather in the fact that the server sent one and that server->lstrp
2820 * gets updated.
2821 *
2822 * FIXME: maybe we should consider checking that the reply matches request?
2823 */
2824static void
2825smb2_echo_callback(struct mid_q_entry *mid)
2826{
2827 struct TCP_Server_Info *server = mid->callback_data;
2828 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2829 unsigned int credits_received = 1;
2830
2831 if (mid->mid_state == MID_RESPONSE_RECEIVED)
2832 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2833
2834 DeleteMidQEntry(mid);
2835 add_credits(server, credits_received, CIFS_ECHO_OP);
2836}
2837
2838void smb2_reconnect_server(struct work_struct *work)
2839{
2840 struct TCP_Server_Info *server = container_of(work,
2841 struct TCP_Server_Info, reconnect.work);
2842 struct cifs_ses *ses;
2843 struct cifs_tcon *tcon, *tcon2;
2844 struct list_head tmp_list;
2845 int tcon_exist = false;
2846 int rc;
2847 int resched = false;
2848
2849
2850 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2851 mutex_lock(&server->reconnect_mutex);
2852
2853 INIT_LIST_HEAD(&tmp_list);
2854 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2855
2856 spin_lock(&cifs_tcp_ses_lock);
2857 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2858 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2859 if (tcon->need_reconnect || tcon->need_reopen_files) {
2860 tcon->tc_count++;
2861 list_add_tail(&tcon->rlist, &tmp_list);
2862 tcon_exist = true;
2863 }
2864 }
2865 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2866 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2867 tcon_exist = true;
2868 }
2869 }
2870 /*
2871 * Get the reference to server struct to be sure that the last call of
2872 * cifs_put_tcon() in the loop below won't release the server pointer.
2873 */
2874 if (tcon_exist)
2875 server->srv_count++;
2876
2877 spin_unlock(&cifs_tcp_ses_lock);
2878
2879 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2880 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2881 if (!rc)
2882 cifs_reopen_persistent_handles(tcon);
2883 else
2884 resched = true;
2885 list_del_init(&tcon->rlist);
2886 cifs_put_tcon(tcon);
2887 }
2888
2889 cifs_dbg(FYI, "Reconnecting tcons finished\n");
2890 if (resched)
2891 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2892 mutex_unlock(&server->reconnect_mutex);
2893
2894 /* now we can safely release srv struct */
2895 if (tcon_exist)
2896 cifs_put_tcp_session(server, 1);
2897}
2898
2899int
2900SMB2_echo(struct TCP_Server_Info *server)
2901{
2902 struct smb2_echo_req *req;
2903 int rc = 0;
2904 struct kvec iov[1];
2905 struct smb_rqst rqst = { .rq_iov = iov,
2906 .rq_nvec = 1 };
2907 unsigned int total_len;
2908
2909 cifs_dbg(FYI, "In echo request\n");
2910
2911 if (server->tcpStatus == CifsNeedNegotiate) {
2912 /* No need to send echo on newly established connections */
2913 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2914 return rc;
2915 }
2916
2917 rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2918 if (rc)
2919 return rc;
2920
2921 req->sync_hdr.CreditRequest = cpu_to_le16(1);
2922
2923 iov[0].iov_len = total_len;
2924 iov[0].iov_base = (char *)req;
2925
2926 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2927 server, CIFS_ECHO_OP);
2928 if (rc)
2929 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2930
2931 cifs_small_buf_release(req);
2932 return rc;
2933}
2934
2935int
2936SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2937 u64 volatile_fid)
2938{
2939 struct smb_rqst rqst;
2940 struct smb2_flush_req *req;
2941 struct cifs_ses *ses = tcon->ses;
2942 struct kvec iov[1];
2943 struct kvec rsp_iov;
2944 int resp_buftype;
2945 int rc = 0;
2946 int flags = 0;
2947 unsigned int total_len;
2948
2949 cifs_dbg(FYI, "Flush\n");
2950
2951 if (!ses || !(ses->server))
2952 return -EIO;
2953
2954 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2955 if (rc)
2956 return rc;
2957
2958 if (smb3_encryption_required(tcon))
2959 flags |= CIFS_TRANSFORM_REQ;
2960
2961 req->PersistentFileId = persistent_fid;
2962 req->VolatileFileId = volatile_fid;
2963
2964 iov[0].iov_base = (char *)req;
2965 iov[0].iov_len = total_len;
2966
2967 memset(&rqst, 0, sizeof(struct smb_rqst));
2968 rqst.rq_iov = iov;
2969 rqst.rq_nvec = 1;
2970
2971 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2972 cifs_small_buf_release(req);
2973
2974 if (rc != 0) {
2975 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2976 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2977 rc);
2978 }
2979
2980 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2981 return rc;
2982}
2983
2984/*
2985 * To form a chain of read requests, any read requests after the first should
2986 * have the end_of_chain boolean set to true.
2987 */
2988static int
2989smb2_new_read_req(void **buf, unsigned int *total_len,
2990 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2991 unsigned int remaining_bytes, int request_type)
2992{
2993 int rc = -EACCES;
2994 struct smb2_read_plain_req *req = NULL;
2995 struct smb2_sync_hdr *shdr;
2996 struct TCP_Server_Info *server;
2997
2998 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2999 total_len);
3000 if (rc)
3001 return rc;
3002
3003 server = io_parms->tcon->ses->server;
3004 if (server == NULL)
3005 return -ECONNABORTED;
3006
3007 shdr = &req->sync_hdr;
3008 shdr->ProcessId = cpu_to_le32(io_parms->pid);
3009
3010 req->PersistentFileId = io_parms->persistent_fid;
3011 req->VolatileFileId = io_parms->volatile_fid;
3012 req->ReadChannelInfoOffset = 0; /* reserved */
3013 req->ReadChannelInfoLength = 0; /* reserved */
3014 req->Channel = 0; /* reserved */
3015 req->MinimumCount = 0;
3016 req->Length = cpu_to_le32(io_parms->length);
3017 req->Offset = cpu_to_le64(io_parms->offset);
3018#ifdef CONFIG_CIFS_SMB_DIRECT
3019 /*
3020 * If we want to do a RDMA write, fill in and append
3021 * smbd_buffer_descriptor_v1 to the end of read request
3022 */
3023 if (server->rdma && rdata && !server->sign &&
3024 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3025
3026 struct smbd_buffer_descriptor_v1 *v1;
3027 bool need_invalidate =
3028 io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3029
3030 rdata->mr = smbd_register_mr(
3031 server->smbd_conn, rdata->pages,
3032 rdata->nr_pages, rdata->page_offset,
3033 rdata->tailsz, true, need_invalidate);
3034 if (!rdata->mr)
3035 return -ENOBUFS;
3036
3037 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3038 if (need_invalidate)
3039 req->Channel = SMB2_CHANNEL_RDMA_V1;
3040 req->ReadChannelInfoOffset =
3041 cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3042 req->ReadChannelInfoLength =
3043 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3044 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3045 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3046 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3047 v1->length = cpu_to_le32(rdata->mr->mr->length);
3048
3049 *total_len += sizeof(*v1) - 1;
3050 }
3051#endif
3052 if (request_type & CHAINED_REQUEST) {
3053 if (!(request_type & END_OF_CHAIN)) {
3054 /* next 8-byte aligned request */
3055 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3056 shdr->NextCommand = cpu_to_le32(*total_len);
3057 } else /* END_OF_CHAIN */
3058 shdr->NextCommand = 0;
3059 if (request_type & RELATED_REQUEST) {
3060 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3061 /*
3062 * Related requests use info from previous read request
3063 * in chain.
3064 */
3065 shdr->SessionId = 0xFFFFFFFF;
3066 shdr->TreeId = 0xFFFFFFFF;
3067 req->PersistentFileId = 0xFFFFFFFF;
3068 req->VolatileFileId = 0xFFFFFFFF;
3069 }
3070 }
3071 if (remaining_bytes > io_parms->length)
3072 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3073 else
3074 req->RemainingBytes = 0;
3075
3076 *buf = req;
3077 return rc;
3078}
3079
3080static void
3081smb2_readv_callback(struct mid_q_entry *mid)
3082{
3083 struct cifs_readdata *rdata = mid->callback_data;
3084 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3085 struct TCP_Server_Info *server = tcon->ses->server;
3086 struct smb2_sync_hdr *shdr =
3087 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3088 unsigned int credits_received = 1;
3089 struct smb_rqst rqst = { .rq_iov = rdata->iov,
3090 .rq_nvec = 2,
3091 .rq_pages = rdata->pages,
3092 .rq_offset = rdata->page_offset,
3093 .rq_npages = rdata->nr_pages,
3094 .rq_pagesz = rdata->pagesz,
3095 .rq_tailsz = rdata->tailsz };
3096
3097 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3098 __func__, mid->mid, mid->mid_state, rdata->result,
3099 rdata->bytes);
3100
3101 switch (mid->mid_state) {
3102 case MID_RESPONSE_RECEIVED:
3103 credits_received = le16_to_cpu(shdr->CreditRequest);
3104 /* result already set, check signature */
3105 if (server->sign && !mid->decrypted) {
3106 int rc;
3107
3108 rc = smb2_verify_signature(&rqst, server);
3109 if (rc)
3110 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3111 rc);
3112 }
3113 /* FIXME: should this be counted toward the initiating task? */
3114 task_io_account_read(rdata->got_bytes);
3115 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3116 break;
3117 case MID_REQUEST_SUBMITTED:
3118 case MID_RETRY_NEEDED:
3119 rdata->result = -EAGAIN;
3120 if (server->sign && rdata->got_bytes)
3121 /* reset bytes number since we can not check a sign */
3122 rdata->got_bytes = 0;
3123 /* FIXME: should this be counted toward the initiating task? */
3124 task_io_account_read(rdata->got_bytes);
3125 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3126 break;
3127 default:
3128 if (rdata->result != -ENODATA)
3129 rdata->result = -EIO;
3130 }
3131#ifdef CONFIG_CIFS_SMB_DIRECT
3132 /*
3133 * If this rdata has a memmory registered, the MR can be freed
3134 * MR needs to be freed as soon as I/O finishes to prevent deadlock
3135 * because they have limited number and are used for future I/Os
3136 */
3137 if (rdata->mr) {
3138 smbd_deregister_mr(rdata->mr);
3139 rdata->mr = NULL;
3140 }
3141#endif
3142 if (rdata->result)
3143 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3144
3145 queue_work(cifsiod_wq, &rdata->work);
3146 DeleteMidQEntry(mid);
3147 add_credits(server, credits_received, 0);
3148}
3149
3150/* smb2_async_readv - send an async read, and set up mid to handle result */
3151int
3152smb2_async_readv(struct cifs_readdata *rdata)
3153{
3154 int rc, flags = 0;
3155 char *buf;
3156 struct smb2_sync_hdr *shdr;
3157 struct cifs_io_parms io_parms;
3158 struct smb_rqst rqst = { .rq_iov = rdata->iov,
3159 .rq_nvec = 1 };
3160 struct TCP_Server_Info *server;
3161 unsigned int total_len;
3162
3163 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3164 __func__, rdata->offset, rdata->bytes);
3165
3166 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3167 io_parms.offset = rdata->offset;
3168 io_parms.length = rdata->bytes;
3169 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3170 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3171 io_parms.pid = rdata->pid;
3172
3173 server = io_parms.tcon->ses->server;
3174
3175 rc = smb2_new_read_req(
3176 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3177 if (rc) {
3178 if (rc == -EAGAIN && rdata->credits) {
3179 /* credits was reset by reconnect */
3180 rdata->credits = 0;
3181 /* reduce in_flight value since we won't send the req */
3182 spin_lock(&server->req_lock);
3183 server->in_flight--;
3184 spin_unlock(&server->req_lock);
3185 }
3186 return rc;
3187 }
3188
3189 if (smb3_encryption_required(io_parms.tcon))
3190 flags |= CIFS_TRANSFORM_REQ;
3191
3192 rdata->iov[0].iov_base = buf;
3193 rdata->iov[0].iov_len = total_len;
3194
3195 shdr = (struct smb2_sync_hdr *)buf;
3196
3197 if (rdata->credits) {
3198 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3199 SMB2_MAX_BUFFER_SIZE));
3200 shdr->CreditRequest = shdr->CreditCharge;
3201 spin_lock(&server->req_lock);
3202 server->credits += rdata->credits -
3203 le16_to_cpu(shdr->CreditCharge);
3204 spin_unlock(&server->req_lock);
3205 wake_up(&server->request_q);
3206 flags |= CIFS_HAS_CREDITS;
3207 }
3208
3209 kref_get(&rdata->refcount);
3210 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3211 cifs_readv_receive, smb2_readv_callback,
3212 smb3_handle_read_data, rdata, flags);
3213 if (rc) {
3214 kref_put(&rdata->refcount, cifs_readdata_release);
3215 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3216 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3217 io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3218 io_parms.offset, io_parms.length);
3219 } else
3220 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3221 io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3222 io_parms.offset, io_parms.length);
3223
3224 cifs_small_buf_release(buf);
3225 return rc;
3226}
3227
3228int
3229SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3230 unsigned int *nbytes, char **buf, int *buf_type)
3231{
3232 struct smb_rqst rqst;
3233 int resp_buftype, rc = -EACCES;
3234 struct smb2_read_plain_req *req = NULL;
3235 struct smb2_read_rsp *rsp = NULL;
3236 struct kvec iov[1];
3237 struct kvec rsp_iov;
3238 unsigned int total_len;
3239 int flags = CIFS_LOG_ERROR;
3240 struct cifs_ses *ses = io_parms->tcon->ses;
3241
3242 *nbytes = 0;
3243 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3244 if (rc)
3245 return rc;
3246
3247 if (smb3_encryption_required(io_parms->tcon))
3248 flags |= CIFS_TRANSFORM_REQ;
3249
3250 iov[0].iov_base = (char *)req;
3251 iov[0].iov_len = total_len;
3252
3253 memset(&rqst, 0, sizeof(struct smb_rqst));
3254 rqst.rq_iov = iov;
3255 rqst.rq_nvec = 1;
3256
3257 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3258 cifs_small_buf_release(req);
3259
3260 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3261
3262 if (rc) {
3263 if (rc != -ENODATA) {
3264 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3265 cifs_dbg(VFS, "Send error in read = %d\n", rc);
3266 }
3267 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3268 io_parms->tcon->tid, ses->Suid,
3269 io_parms->offset, io_parms->length);
3270 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3271 return rc == -ENODATA ? 0 : rc;
3272 } else
3273 trace_smb3_read_done(xid, req->PersistentFileId,
3274 io_parms->tcon->tid, ses->Suid,
3275 io_parms->offset, io_parms->length);
3276
3277 *nbytes = le32_to_cpu(rsp->DataLength);
3278 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3279 (*nbytes > io_parms->length)) {
3280 cifs_dbg(FYI, "bad length %d for count %d\n",
3281 *nbytes, io_parms->length);
3282 rc = -EIO;
3283 *nbytes = 0;
3284 }
3285
3286 if (*buf) {
3287 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3288 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3289 } else if (resp_buftype != CIFS_NO_BUFFER) {
3290 *buf = rsp_iov.iov_base;
3291 if (resp_buftype == CIFS_SMALL_BUFFER)
3292 *buf_type = CIFS_SMALL_BUFFER;
3293 else if (resp_buftype == CIFS_LARGE_BUFFER)
3294 *buf_type = CIFS_LARGE_BUFFER;
3295 }
3296 return rc;
3297}
3298
3299/*
3300 * Check the mid_state and signature on received buffer (if any), and queue the
3301 * workqueue completion task.
3302 */
3303static void
3304smb2_writev_callback(struct mid_q_entry *mid)
3305{
3306 struct cifs_writedata *wdata = mid->callback_data;
3307 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3308 unsigned int written;
3309 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3310 unsigned int credits_received = 1;
3311
3312 switch (mid->mid_state) {
3313 case MID_RESPONSE_RECEIVED:
3314 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3315 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3316 if (wdata->result != 0)
3317 break;
3318
3319 written = le32_to_cpu(rsp->DataLength);
3320 /*
3321 * Mask off high 16 bits when bytes written as returned
3322 * by the server is greater than bytes requested by the
3323 * client. OS/2 servers are known to set incorrect
3324 * CountHigh values.
3325 */
3326 if (written > wdata->bytes)
3327 written &= 0xFFFF;
3328
3329 if (written < wdata->bytes)
3330 wdata->result = -ENOSPC;
3331 else
3332 wdata->bytes = written;
3333 break;
3334 case MID_REQUEST_SUBMITTED:
3335 case MID_RETRY_NEEDED:
3336 wdata->result = -EAGAIN;
3337 break;
3338 default:
3339 wdata->result = -EIO;
3340 break;
3341 }
3342#ifdef CONFIG_CIFS_SMB_DIRECT
3343 /*
3344 * If this wdata has a memory registered, the MR can be freed
3345 * The number of MRs available is limited, it's important to recover
3346 * used MR as soon as I/O is finished. Hold MR longer in the later
3347 * I/O process can possibly result in I/O deadlock due to lack of MR
3348 * to send request on I/O retry
3349 */
3350 if (wdata->mr) {
3351 smbd_deregister_mr(wdata->mr);
3352 wdata->mr = NULL;
3353 }
3354#endif
3355 if (wdata->result)
3356 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3357
3358 queue_work(cifsiod_wq, &wdata->work);
3359 DeleteMidQEntry(mid);
3360 add_credits(tcon->ses->server, credits_received, 0);
3361}
3362
3363/* smb2_async_writev - send an async write, and set up mid to handle result */
3364int
3365smb2_async_writev(struct cifs_writedata *wdata,
3366 void (*release)(struct kref *kref))
3367{
3368 int rc = -EACCES, flags = 0;
3369 struct smb2_write_req *req = NULL;
3370 struct smb2_sync_hdr *shdr;
3371 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3372 struct TCP_Server_Info *server = tcon->ses->server;
3373 struct kvec iov[1];
3374 struct smb_rqst rqst = { };
3375 unsigned int total_len;
3376
3377 rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3378 if (rc) {
3379 if (rc == -EAGAIN && wdata->credits) {
3380 /* credits was reset by reconnect */
3381 wdata->credits = 0;
3382 /* reduce in_flight value since we won't send the req */
3383 spin_lock(&server->req_lock);
3384 server->in_flight--;
3385 spin_unlock(&server->req_lock);
3386 }
3387 goto async_writev_out;
3388 }
3389
3390 if (smb3_encryption_required(tcon))
3391 flags |= CIFS_TRANSFORM_REQ;
3392
3393 shdr = (struct smb2_sync_hdr *)req;
3394 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3395
3396 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3397 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3398 req->WriteChannelInfoOffset = 0;
3399 req->WriteChannelInfoLength = 0;
3400 req->Channel = 0;
3401 req->Offset = cpu_to_le64(wdata->offset);
3402 req->DataOffset = cpu_to_le16(
3403 offsetof(struct smb2_write_req, Buffer));
3404 req->RemainingBytes = 0;
3405#ifdef CONFIG_CIFS_SMB_DIRECT
3406 /*
3407 * If we want to do a server RDMA read, fill in and append
3408 * smbd_buffer_descriptor_v1 to the end of write request
3409 */
3410 if (server->rdma && !server->sign && wdata->bytes >=
3411 server->smbd_conn->rdma_readwrite_threshold) {
3412
3413 struct smbd_buffer_descriptor_v1 *v1;
3414 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3415
3416 wdata->mr = smbd_register_mr(
3417 server->smbd_conn, wdata->pages,
3418 wdata->nr_pages, wdata->page_offset,
3419 wdata->tailsz, false, need_invalidate);
3420 if (!wdata->mr) {
3421 rc = -ENOBUFS;
3422 goto async_writev_out;
3423 }
3424 req->Length = 0;
3425 req->DataOffset = 0;
3426 if (wdata->nr_pages > 1)
3427 req->RemainingBytes =
3428 cpu_to_le32(
3429 (wdata->nr_pages - 1) * wdata->pagesz -
3430 wdata->page_offset + wdata->tailsz
3431 );
3432 else
3433 req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3434 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3435 if (need_invalidate)
3436 req->Channel = SMB2_CHANNEL_RDMA_V1;
3437 req->WriteChannelInfoOffset =
3438 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3439 req->WriteChannelInfoLength =
3440 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3441 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3442 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3443 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3444 v1->length = cpu_to_le32(wdata->mr->mr->length);
3445 }
3446#endif
3447 iov[0].iov_len = total_len - 1;
3448 iov[0].iov_base = (char *)req;
3449
3450 rqst.rq_iov = iov;
3451 rqst.rq_nvec = 1;
3452 rqst.rq_pages = wdata->pages;
3453 rqst.rq_offset = wdata->page_offset;
3454 rqst.rq_npages = wdata->nr_pages;
3455 rqst.rq_pagesz = wdata->pagesz;
3456 rqst.rq_tailsz = wdata->tailsz;
3457#ifdef CONFIG_CIFS_SMB_DIRECT
3458 if (wdata->mr) {
3459 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3460 rqst.rq_npages = 0;
3461 }
3462#endif
3463 cifs_dbg(FYI, "async write at %llu %u bytes\n",
3464 wdata->offset, wdata->bytes);
3465
3466#ifdef CONFIG_CIFS_SMB_DIRECT
3467 /* For RDMA read, I/O size is in RemainingBytes not in Length */
3468 if (!wdata->mr)
3469 req->Length = cpu_to_le32(wdata->bytes);
3470#else
3471 req->Length = cpu_to_le32(wdata->bytes);
3472#endif
3473
3474 if (wdata->credits) {
3475 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3476 SMB2_MAX_BUFFER_SIZE));
3477 shdr->CreditRequest = shdr->CreditCharge;
3478 spin_lock(&server->req_lock);
3479 server->credits += wdata->credits -
3480 le16_to_cpu(shdr->CreditCharge);
3481 spin_unlock(&server->req_lock);
3482 wake_up(&server->request_q);
3483 flags |= CIFS_HAS_CREDITS;
3484 }
3485
3486 kref_get(&wdata->refcount);
3487 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3488 wdata, flags);
3489
3490 if (rc) {
3491 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3492 tcon->tid, tcon->ses->Suid, wdata->offset,
3493 wdata->bytes, rc);
3494 kref_put(&wdata->refcount, release);
3495 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3496 } else
3497 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3498 tcon->tid, tcon->ses->Suid, wdata->offset,
3499 wdata->bytes);
3500
3501async_writev_out:
3502 cifs_small_buf_release(req);
3503 return rc;
3504}
3505
3506/*
3507 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3508 * The length field from io_parms must be at least 1 and indicates a number of
3509 * elements with data to write that begins with position 1 in iov array. All
3510 * data length is specified by count.
3511 */
3512int
3513SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3514 unsigned int *nbytes, struct kvec *iov, int n_vec)
3515{
3516 struct smb_rqst rqst;
3517 int rc = 0;
3518 struct smb2_write_req *req = NULL;
3519 struct smb2_write_rsp *rsp = NULL;
3520 int resp_buftype;
3521 struct kvec rsp_iov;
3522 int flags = 0;
3523 unsigned int total_len;
3524
3525 *nbytes = 0;
3526
3527 if (n_vec < 1)
3528 return rc;
3529
3530 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3531 &total_len);
3532 if (rc)
3533 return rc;
3534
3535 if (io_parms->tcon->ses->server == NULL)
3536 return -ECONNABORTED;
3537
3538 if (smb3_encryption_required(io_parms->tcon))
3539 flags |= CIFS_TRANSFORM_REQ;
3540
3541 req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3542
3543 req->PersistentFileId = io_parms->persistent_fid;
3544 req->VolatileFileId = io_parms->volatile_fid;
3545 req->WriteChannelInfoOffset = 0;
3546 req->WriteChannelInfoLength = 0;
3547 req->Channel = 0;
3548 req->Length = cpu_to_le32(io_parms->length);
3549 req->Offset = cpu_to_le64(io_parms->offset);
3550 req->DataOffset = cpu_to_le16(
3551 offsetof(struct smb2_write_req, Buffer));
3552 req->RemainingBytes = 0;
3553
3554 iov[0].iov_base = (char *)req;
3555 /* 1 for Buffer */
3556 iov[0].iov_len = total_len - 1;
3557
3558 memset(&rqst, 0, sizeof(struct smb_rqst));
3559 rqst.rq_iov = iov;
3560 rqst.rq_nvec = n_vec + 1;
3561
3562 rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3563 &resp_buftype, flags, &rsp_iov);
3564 cifs_small_buf_release(req);
3565 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3566
3567 if (rc) {
3568 trace_smb3_write_err(xid, req->PersistentFileId,
3569 io_parms->tcon->tid,
3570 io_parms->tcon->ses->Suid,
3571 io_parms->offset, io_parms->length, rc);
3572 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3573 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3574 } else {
3575 *nbytes = le32_to_cpu(rsp->DataLength);
3576 trace_smb3_write_done(xid, req->PersistentFileId,
3577 io_parms->tcon->tid,
3578 io_parms->tcon->ses->Suid,
3579 io_parms->offset, *nbytes);
3580 }
3581
3582 free_rsp_buf(resp_buftype, rsp);
3583 return rc;
3584}
3585
3586static unsigned int
3587num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3588{
3589 int len;
3590 unsigned int entrycount = 0;
3591 unsigned int next_offset = 0;
3592 char *entryptr;
3593 FILE_DIRECTORY_INFO *dir_info;
3594
3595 if (bufstart == NULL)
3596 return 0;
3597
3598 entryptr = bufstart;
3599
3600 while (1) {
3601 if (entryptr + next_offset < entryptr ||
3602 entryptr + next_offset > end_of_buf ||
3603 entryptr + next_offset + size > end_of_buf) {
3604 cifs_dbg(VFS, "malformed search entry would overflow\n");
3605 break;
3606 }
3607
3608 entryptr = entryptr + next_offset;
3609 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3610
3611 len = le32_to_cpu(dir_info->FileNameLength);
3612 if (entryptr + len < entryptr ||
3613 entryptr + len > end_of_buf ||
3614 entryptr + len + size > end_of_buf) {
3615 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3616 end_of_buf);
3617 break;
3618 }
3619
3620 *lastentry = entryptr;
3621 entrycount++;
3622
3623 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3624 if (!next_offset)
3625 break;
3626 }
3627
3628 return entrycount;
3629}
3630
3631/*
3632 * Readdir/FindFirst
3633 */
3634int
3635SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3636 u64 persistent_fid, u64 volatile_fid, int index,
3637 struct cifs_search_info *srch_inf)
3638{
3639 struct smb_rqst rqst;
3640 struct smb2_query_directory_req *req;
3641 struct smb2_query_directory_rsp *rsp = NULL;
3642 struct kvec iov[2];
3643 struct kvec rsp_iov;
3644 int rc = 0;
3645 int len;
3646 int resp_buftype = CIFS_NO_BUFFER;
3647 unsigned char *bufptr;
3648 struct TCP_Server_Info *server;
3649 struct cifs_ses *ses = tcon->ses;
3650 __le16 asteriks = cpu_to_le16('*');
3651 char *end_of_smb;
3652 unsigned int output_size = CIFSMaxBufSize;
3653 size_t info_buf_size;
3654 int flags = 0;
3655 unsigned int total_len;
3656
3657 if (ses && (ses->server))
3658 server = ses->server;
3659 else
3660 return -EIO;
3661
3662 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3663 &total_len);
3664 if (rc)
3665 return rc;
3666
3667 if (smb3_encryption_required(tcon))
3668 flags |= CIFS_TRANSFORM_REQ;
3669
3670 switch (srch_inf->info_level) {
3671 case SMB_FIND_FILE_DIRECTORY_INFO:
3672 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3673 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3674 break;
3675 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3676 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3677 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3678 break;
3679 default:
3680 cifs_dbg(VFS, "info level %u isn't supported\n",
3681 srch_inf->info_level);
3682 rc = -EINVAL;
3683 goto qdir_exit;
3684 }
3685
3686 req->FileIndex = cpu_to_le32(index);
3687 req->PersistentFileId = persistent_fid;
3688 req->VolatileFileId = volatile_fid;
3689
3690 len = 0x2;
3691 bufptr = req->Buffer;
3692 memcpy(bufptr, &asteriks, len);
3693
3694 req->FileNameOffset =
3695 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3696 req->FileNameLength = cpu_to_le16(len);
3697 /*
3698 * BB could be 30 bytes or so longer if we used SMB2 specific
3699 * buffer lengths, but this is safe and close enough.
3700 */
3701 output_size = min_t(unsigned int, output_size, server->maxBuf);
3702 output_size = min_t(unsigned int, output_size, 2 << 15);
3703 req->OutputBufferLength = cpu_to_le32(output_size);
3704
3705 iov[0].iov_base = (char *)req;
3706 /* 1 for Buffer */
3707 iov[0].iov_len = total_len - 1;
3708
3709 iov[1].iov_base = (char *)(req->Buffer);
3710 iov[1].iov_len = len;
3711
3712 memset(&rqst, 0, sizeof(struct smb_rqst));
3713 rqst.rq_iov = iov;
3714 rqst.rq_nvec = 2;
3715
3716 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3717 cifs_small_buf_release(req);
3718 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3719
3720 if (rc) {
3721 if (rc == -ENODATA &&
3722 rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3723 srch_inf->endOfSearch = true;
3724 rc = 0;
3725 }
3726 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3727 goto qdir_exit;
3728 }
3729
3730 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3731 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3732 info_buf_size);
3733 if (rc)
3734 goto qdir_exit;
3735
3736 srch_inf->unicode = true;
3737
3738 if (srch_inf->ntwrk_buf_start) {
3739 if (srch_inf->smallBuf)
3740 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3741 else
3742 cifs_buf_release(srch_inf->ntwrk_buf_start);
3743 }
3744 srch_inf->ntwrk_buf_start = (char *)rsp;
3745 srch_inf->srch_entries_start = srch_inf->last_entry =
3746 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3747 end_of_smb = rsp_iov.iov_len + (char *)rsp;
3748 srch_inf->entries_in_buffer =
3749 num_entries(srch_inf->srch_entries_start, end_of_smb,
3750 &srch_inf->last_entry, info_buf_size);
3751 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3752 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3753 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3754 srch_inf->srch_entries_start, srch_inf->last_entry);
3755 if (resp_buftype == CIFS_LARGE_BUFFER)
3756 srch_inf->smallBuf = false;
3757 else if (resp_buftype == CIFS_SMALL_BUFFER)
3758 srch_inf->smallBuf = true;
3759 else
3760 cifs_dbg(VFS, "illegal search buffer type\n");
3761
3762 return rc;
3763
3764qdir_exit:
3765 free_rsp_buf(resp_buftype, rsp);
3766 return rc;
3767}
3768
3769int
3770SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3771 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3772 u8 info_type, u32 additional_info,
3773 void **data, unsigned int *size)
3774{
3775 struct smb2_set_info_req *req;
3776 struct kvec *iov = rqst->rq_iov;
3777 unsigned int i, total_len;
3778 int rc;
3779
3780 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3781 if (rc)
3782 return rc;
3783
3784 req->sync_hdr.ProcessId = cpu_to_le32(pid);
3785 req->InfoType = info_type;
3786 req->FileInfoClass = info_class;
3787 req->PersistentFileId = persistent_fid;
3788 req->VolatileFileId = volatile_fid;
3789 req->AdditionalInformation = cpu_to_le32(additional_info);
3790
3791 req->BufferOffset =
3792 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3793 req->BufferLength = cpu_to_le32(*size);
3794
3795 memcpy(req->Buffer, *data, *size);
3796 total_len += *size;
3797
3798 iov[0].iov_base = (char *)req;
3799 /* 1 for Buffer */
3800 iov[0].iov_len = total_len - 1;
3801
3802 for (i = 1; i < rqst->rq_nvec; i++) {
3803 le32_add_cpu(&req->BufferLength, size[i]);
3804 iov[i].iov_base = (char *)data[i];
3805 iov[i].iov_len = size[i];
3806 }
3807
3808 return 0;
3809}
3810
3811void
3812SMB2_set_info_free(struct smb_rqst *rqst)
3813{
3814 if (rqst && rqst->rq_iov)
3815 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3816}
3817
3818static int
3819send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3820 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3821 u8 info_type, u32 additional_info, unsigned int num,
3822 void **data, unsigned int *size)
3823{
3824 struct smb_rqst rqst;
3825 struct smb2_set_info_rsp *rsp = NULL;
3826 struct kvec *iov;
3827 struct kvec rsp_iov;
3828 int rc = 0;
3829 int resp_buftype;
3830 struct cifs_ses *ses = tcon->ses;
3831 int flags = 0;
3832
3833 if (!ses || !(ses->server))
3834 return -EIO;
3835
3836 if (!num)
3837 return -EINVAL;
3838
3839 if (smb3_encryption_required(tcon))
3840 flags |= CIFS_TRANSFORM_REQ;
3841
3842 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3843 if (!iov)
3844 return -ENOMEM;
3845
3846 memset(&rqst, 0, sizeof(struct smb_rqst));
3847 rqst.rq_iov = iov;
3848 rqst.rq_nvec = num;
3849
3850 rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3851 info_class, info_type, additional_info,
3852 data, size);
3853 if (rc) {
3854 kfree(iov);
3855 return rc;
3856 }
3857
3858
3859 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3860 &rsp_iov);
3861 SMB2_set_info_free(&rqst);
3862 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3863
3864 if (rc != 0) {
3865 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3866 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3867 ses->Suid, info_class, (__u32)info_type, rc);
3868 }
3869
3870 free_rsp_buf(resp_buftype, rsp);
3871 kfree(iov);
3872 return rc;
3873}
3874
3875int
3876SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3877 u64 volatile_fid, u32 pid, __le64 *eof)
3878{
3879 struct smb2_file_eof_info info;
3880 void *data;
3881 unsigned int size;
3882
3883 info.EndOfFile = *eof;
3884
3885 data = &info;
3886 size = sizeof(struct smb2_file_eof_info);
3887
3888 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3889 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3890 0, 1, &data, &size);
3891}
3892
3893int
3894SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3895 u64 persistent_fid, u64 volatile_fid,
3896 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3897{
3898 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3899 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3900 1, (void **)&pnntsd, &pacllen);
3901}
3902
3903int
3904SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3905 u64 persistent_fid, u64 volatile_fid,
3906 struct smb2_file_full_ea_info *buf, int len)
3907{
3908 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3909 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3910 0, 1, (void **)&buf, &len);
3911}
3912
3913int
3914SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3915 const u64 persistent_fid, const u64 volatile_fid,
3916 __u8 oplock_level)
3917{
3918 struct smb_rqst rqst;
3919 int rc;
3920 struct smb2_oplock_break *req = NULL;
3921 struct cifs_ses *ses = tcon->ses;
3922 int flags = CIFS_OBREAK_OP;
3923 unsigned int total_len;
3924 struct kvec iov[1];
3925 struct kvec rsp_iov;
3926 int resp_buf_type;
3927
3928 cifs_dbg(FYI, "SMB2_oplock_break\n");
3929 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3930 &total_len);
3931 if (rc)
3932 return rc;
3933
3934 if (smb3_encryption_required(tcon))
3935 flags |= CIFS_TRANSFORM_REQ;
3936
3937 req->VolatileFid = volatile_fid;
3938 req->PersistentFid = persistent_fid;
3939 req->OplockLevel = oplock_level;
3940 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3941
3942 flags |= CIFS_NO_RESP;
3943
3944 iov[0].iov_base = (char *)req;
3945 iov[0].iov_len = total_len;
3946
3947 memset(&rqst, 0, sizeof(struct smb_rqst));
3948 rqst.rq_iov = iov;
3949 rqst.rq_nvec = 1;
3950
3951 rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3952 cifs_small_buf_release(req);
3953
3954 if (rc) {
3955 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3956 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3957 }
3958
3959 return rc;
3960}
3961
3962void
3963smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3964 struct kstatfs *kst)
3965{
3966 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3967 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3968 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3969 kst->f_bfree = kst->f_bavail =
3970 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3971 return;
3972}
3973
3974static void
3975copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
3976 struct kstatfs *kst)
3977{
3978 kst->f_bsize = le32_to_cpu(response_data->BlockSize);
3979 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
3980 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail);
3981 if (response_data->UserBlocksAvail == cpu_to_le64(-1))
3982 kst->f_bavail = kst->f_bfree;
3983 else
3984 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
3985 if (response_data->TotalFileNodes != cpu_to_le64(-1))
3986 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
3987 if (response_data->FreeFileNodes != cpu_to_le64(-1))
3988 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
3989
3990 return;
3991}
3992
3993static int
3994build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3995 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3996{
3997 struct TCP_Server_Info *server;
3998 int rc;
3999 struct smb2_query_info_req *req;
4000 unsigned int total_len;
4001
4002 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4003
4004 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4005 return -EIO;
4006
4007 server = tcon->ses->server;
4008
4009 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4010 &total_len);
4011 if (rc)
4012 return rc;
4013
4014 req->InfoType = SMB2_O_INFO_FILESYSTEM;
4015 req->FileInfoClass = level;
4016 req->PersistentFileId = persistent_fid;
4017 req->VolatileFileId = volatile_fid;
4018 /* 1 for pad */
4019 req->InputBufferOffset =
4020 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4021 req->OutputBufferLength = cpu_to_le32(
4022 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4023
4024 iov->iov_base = (char *)req;
4025 iov->iov_len = total_len;
4026 return 0;
4027}
4028
4029int
4030SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4031 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4032{
4033 struct smb_rqst rqst;
4034 struct smb2_query_info_rsp *rsp = NULL;
4035 struct kvec iov;
4036 struct kvec rsp_iov;
4037 int rc = 0;
4038 int resp_buftype;
4039 struct cifs_ses *ses = tcon->ses;
4040 FILE_SYSTEM_POSIX_INFO *info = NULL;
4041 int flags = 0;
4042
4043 rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4044 sizeof(FILE_SYSTEM_POSIX_INFO),
4045 persistent_fid, volatile_fid);
4046 if (rc)
4047 return rc;
4048
4049 if (smb3_encryption_required(tcon))
4050 flags |= CIFS_TRANSFORM_REQ;
4051
4052 memset(&rqst, 0, sizeof(struct smb_rqst));
4053 rqst.rq_iov = &iov;
4054 rqst.rq_nvec = 1;
4055
4056 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4057 cifs_small_buf_release(iov.iov_base);
4058 if (rc) {
4059 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4060 goto posix_qfsinf_exit;
4061 }
4062 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4063
4064 info = (FILE_SYSTEM_POSIX_INFO *)(
4065 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4066 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4067 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4068 sizeof(FILE_SYSTEM_POSIX_INFO));
4069 if (!rc)
4070 copy_posix_fs_info_to_kstatfs(info, fsdata);
4071
4072posix_qfsinf_exit:
4073 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4074 return rc;
4075}
4076
4077int
4078SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4079 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4080{
4081 struct smb_rqst rqst;
4082 struct smb2_query_info_rsp *rsp = NULL;
4083 struct kvec iov;
4084 struct kvec rsp_iov;
4085 int rc = 0;
4086 int resp_buftype;
4087 struct cifs_ses *ses = tcon->ses;
4088 struct smb2_fs_full_size_info *info = NULL;
4089 int flags = 0;
4090
4091 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4092 sizeof(struct smb2_fs_full_size_info),
4093 persistent_fid, volatile_fid);
4094 if (rc)
4095 return rc;
4096
4097 if (smb3_encryption_required(tcon))
4098 flags |= CIFS_TRANSFORM_REQ;
4099
4100 memset(&rqst, 0, sizeof(struct smb_rqst));
4101 rqst.rq_iov = &iov;
4102 rqst.rq_nvec = 1;
4103
4104 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4105 cifs_small_buf_release(iov.iov_base);
4106 if (rc) {
4107 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4108 goto qfsinf_exit;
4109 }
4110 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4111
4112 info = (struct smb2_fs_full_size_info *)(
4113 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4114 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4115 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4116 sizeof(struct smb2_fs_full_size_info));
4117 if (!rc)
4118 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4119
4120qfsinf_exit:
4121 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4122 return rc;
4123}
4124
4125int
4126SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4127 u64 persistent_fid, u64 volatile_fid, int level)
4128{
4129 struct smb_rqst rqst;
4130 struct smb2_query_info_rsp *rsp = NULL;
4131 struct kvec iov;
4132 struct kvec rsp_iov;
4133 int rc = 0;
4134 int resp_buftype, max_len, min_len;
4135 struct cifs_ses *ses = tcon->ses;
4136 unsigned int rsp_len, offset;
4137 int flags = 0;
4138
4139 if (level == FS_DEVICE_INFORMATION) {
4140 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4141 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4142 } else if (level == FS_ATTRIBUTE_INFORMATION) {
4143 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4144 min_len = MIN_FS_ATTR_INFO_SIZE;
4145 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4146 max_len = sizeof(struct smb3_fs_ss_info);
4147 min_len = sizeof(struct smb3_fs_ss_info);
4148 } else if (level == FS_VOLUME_INFORMATION) {
4149 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4150 min_len = sizeof(struct smb3_fs_vol_info);
4151 } else {
4152 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4153 return -EINVAL;
4154 }
4155
4156 rc = build_qfs_info_req(&iov, tcon, level, max_len,
4157 persistent_fid, volatile_fid);
4158 if (rc)
4159 return rc;
4160
4161 if (smb3_encryption_required(tcon))
4162 flags |= CIFS_TRANSFORM_REQ;
4163
4164 memset(&rqst, 0, sizeof(struct smb_rqst));
4165 rqst.rq_iov = &iov;
4166 rqst.rq_nvec = 1;
4167
4168 rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4169 cifs_small_buf_release(iov.iov_base);
4170 if (rc) {
4171 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4172 goto qfsattr_exit;
4173 }
4174 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4175
4176 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4177 offset = le16_to_cpu(rsp->OutputBufferOffset);
4178 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4179 if (rc)
4180 goto qfsattr_exit;
4181
4182 if (level == FS_ATTRIBUTE_INFORMATION)
4183 memcpy(&tcon->fsAttrInfo, offset
4184 + (char *)rsp, min_t(unsigned int,
4185 rsp_len, max_len));
4186 else if (level == FS_DEVICE_INFORMATION)
4187 memcpy(&tcon->fsDevInfo, offset
4188 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4189 else if (level == FS_SECTOR_SIZE_INFORMATION) {
4190 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4191 (offset + (char *)rsp);
4192 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4193 tcon->perf_sector_size =
4194 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4195 } else if (level == FS_VOLUME_INFORMATION) {
4196 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4197 (offset + (char *)rsp);
4198 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4199 tcon->vol_create_time = vol_info->VolumeCreationTime;
4200 }
4201
4202qfsattr_exit:
4203 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4204 return rc;
4205}
4206
4207int
4208smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4209 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4210 const __u32 num_lock, struct smb2_lock_element *buf)
4211{
4212 struct smb_rqst rqst;
4213 int rc = 0;
4214 struct smb2_lock_req *req = NULL;
4215 struct kvec iov[2];
4216 struct kvec rsp_iov;
4217 int resp_buf_type;
4218 unsigned int count;
4219 int flags = CIFS_NO_RESP;
4220 unsigned int total_len;
4221
4222 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4223
4224 rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4225 if (rc)
4226 return rc;
4227
4228 if (smb3_encryption_required(tcon))
4229 flags |= CIFS_TRANSFORM_REQ;
4230
4231 req->sync_hdr.ProcessId = cpu_to_le32(pid);
4232 req->LockCount = cpu_to_le16(num_lock);
4233
4234 req->PersistentFileId = persist_fid;
4235 req->VolatileFileId = volatile_fid;
4236
4237 count = num_lock * sizeof(struct smb2_lock_element);
4238
4239 iov[0].iov_base = (char *)req;
4240 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4241 iov[1].iov_base = (char *)buf;
4242 iov[1].iov_len = count;
4243
4244 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4245
4246 memset(&rqst, 0, sizeof(struct smb_rqst));
4247 rqst.rq_iov = iov;
4248 rqst.rq_nvec = 2;
4249
4250 rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4251 &rsp_iov);
4252 cifs_small_buf_release(req);
4253 if (rc) {
4254 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4255 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4256 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4257 tcon->ses->Suid, rc);
4258 }
4259
4260 return rc;
4261}
4262
4263int
4264SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4265 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4266 const __u64 length, const __u64 offset, const __u32 lock_flags,
4267 const bool wait)
4268{
4269 struct smb2_lock_element lock;
4270
4271 lock.Offset = cpu_to_le64(offset);
4272 lock.Length = cpu_to_le64(length);
4273 lock.Flags = cpu_to_le32(lock_flags);
4274 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4275 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4276
4277 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4278}
4279
4280int
4281SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4282 __u8 *lease_key, const __le32 lease_state)
4283{
4284 struct smb_rqst rqst;
4285 int rc;
4286 struct smb2_lease_ack *req = NULL;
4287 struct cifs_ses *ses = tcon->ses;
4288 int flags = CIFS_OBREAK_OP;
4289 unsigned int total_len;
4290 struct kvec iov[1];
4291 struct kvec rsp_iov;
4292 int resp_buf_type;
4293 __u64 *please_key_high;
4294 __u64 *please_key_low;
4295
4296 cifs_dbg(FYI, "SMB2_lease_break\n");
4297 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4298 &total_len);
4299 if (rc)
4300 return rc;
4301
4302 if (smb3_encryption_required(tcon))
4303 flags |= CIFS_TRANSFORM_REQ;
4304
4305 req->sync_hdr.CreditRequest = cpu_to_le16(1);
4306 req->StructureSize = cpu_to_le16(36);
4307 total_len += 12;
4308
4309 memcpy(req->LeaseKey, lease_key, 16);
4310 req->LeaseState = lease_state;
4311
4312 flags |= CIFS_NO_RESP;
4313
4314 iov[0].iov_base = (char *)req;
4315 iov[0].iov_len = total_len;
4316
4317 memset(&rqst, 0, sizeof(struct smb_rqst));
4318 rqst.rq_iov = iov;
4319 rqst.rq_nvec = 1;
4320
4321 rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4322 cifs_small_buf_release(req);
4323
4324 please_key_low = (__u64 *)req->LeaseKey;
4325 please_key_high = (__u64 *)(req->LeaseKey+8);
4326 if (rc) {
4327 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4328 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4329 ses->Suid, *please_key_low, *please_key_high, rc);
4330 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4331 } else
4332 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4333 ses->Suid, *please_key_low, *please_key_high);
4334
4335 return rc;
4336}
Linux 6.x block layer and io_uring tree(s)