1 /*
2 * fs/cifs/smb2misc.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23 #include <linux/ctype.h>
24 #include "smb2pdu.h"
25 #include "cifsglob.h"
26 #include "cifsproto.h"
27 #include "smb2proto.h"
28 #include "cifs_debug.h"
29 #include "cifs_unicode.h"
30 #include "smb2status.h"
31
32 static int
check_smb2_hdr(struct smb2_hdr * hdr,__u64 mid)33 check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
34 {
35 /*
36 * Make sure that this really is an SMB, that it is a response,
37 * and that the message ids match.
38 */
39 if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) &&
40 (mid == hdr->MessageId)) {
41 if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
42 return 0;
43 else {
44 /* only one valid case where server sends us request */
45 if (hdr->Command == SMB2_OPLOCK_BREAK)
46 return 0;
47 else
48 cifs_dbg(VFS, "Received Request not response\n");
49 }
50 } else { /* bad signature or mid */
51 if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
52 cifs_dbg(VFS, "Bad protocol string signature header %x\n",
53 *(unsigned int *) hdr->ProtocolId);
54 if (mid != hdr->MessageId)
55 cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
56 mid, hdr->MessageId);
57 }
58 cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", hdr->MessageId);
59 return 1;
60 }
61
62 /*
63 * The following table defines the expected "StructureSize" of SMB2 responses
64 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
65 *
66 * Note that commands are defined in smb2pdu.h in le16 but the array below is
67 * indexed by command in host byte order
68 */
69 static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
70 /* SMB2_NEGOTIATE */ __constant_cpu_to_le16(65),
71 /* SMB2_SESSION_SETUP */ __constant_cpu_to_le16(9),
72 /* SMB2_LOGOFF */ __constant_cpu_to_le16(4),
73 /* SMB2_TREE_CONNECT */ __constant_cpu_to_le16(16),
74 /* SMB2_TREE_DISCONNECT */ __constant_cpu_to_le16(4),
75 /* SMB2_CREATE */ __constant_cpu_to_le16(89),
76 /* SMB2_CLOSE */ __constant_cpu_to_le16(60),
77 /* SMB2_FLUSH */ __constant_cpu_to_le16(4),
78 /* SMB2_READ */ __constant_cpu_to_le16(17),
79 /* SMB2_WRITE */ __constant_cpu_to_le16(17),
80 /* SMB2_LOCK */ __constant_cpu_to_le16(4),
81 /* SMB2_IOCTL */ __constant_cpu_to_le16(49),
82 /* BB CHECK this ... not listed in documentation */
83 /* SMB2_CANCEL */ __constant_cpu_to_le16(0),
84 /* SMB2_ECHO */ __constant_cpu_to_le16(4),
85 /* SMB2_QUERY_DIRECTORY */ __constant_cpu_to_le16(9),
86 /* SMB2_CHANGE_NOTIFY */ __constant_cpu_to_le16(9),
87 /* SMB2_QUERY_INFO */ __constant_cpu_to_le16(9),
88 /* SMB2_SET_INFO */ __constant_cpu_to_le16(2),
89 /* BB FIXME can also be 44 for lease break */
90 /* SMB2_OPLOCK_BREAK */ __constant_cpu_to_le16(24)
91 };
92
93 int
smb2_check_message(char * buf,unsigned int length)94 smb2_check_message(char *buf, unsigned int length)
95 {
96 struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
97 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
98 __u64 mid = hdr->MessageId;
99 __u32 len = get_rfc1002_length(buf);
100 __u32 clc_len; /* calculated length */
101 int command;
102
103 /* BB disable following printk later */
104 cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
105 __func__, length, len);
106
107 /*
108 * Add function to do table lookup of StructureSize by command
109 * ie Validate the wct via smb2_struct_sizes table above
110 */
111
112 if (length < sizeof(struct smb2_pdu)) {
113 if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
114 pdu->StructureSize2 = 0;
115 /*
116 * As with SMB/CIFS, on some error cases servers may
117 * not return wct properly
118 */
119 return 0;
120 } else {
121 cifs_dbg(VFS, "Length less than SMB header size\n");
122 }
123 return 1;
124 }
125 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
126 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
127 mid);
128 return 1;
129 }
130
131 if (check_smb2_hdr(hdr, mid))
132 return 1;
133
134 if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
135 cifs_dbg(VFS, "Illegal structure size %u\n",
136 le16_to_cpu(hdr->StructureSize));
137 return 1;
138 }
139
140 command = le16_to_cpu(hdr->Command);
141 if (command >= NUMBER_OF_SMB2_COMMANDS) {
142 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
143 return 1;
144 }
145
146 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
147 if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
148 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
149 /* error packets have 9 byte structure size */
150 cifs_dbg(VFS, "Illegal response size %u for command %d\n",
151 le16_to_cpu(pdu->StructureSize2), command);
152 return 1;
153 } else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0)
154 && (le16_to_cpu(pdu->StructureSize2) != 44)
155 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
156 /* special case for SMB2.1 lease break message */
157 cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
158 le16_to_cpu(pdu->StructureSize2));
159 return 1;
160 }
161 }
162
163 if (4 + len != length) {
164 cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
165 length, 4 + len, mid);
166 return 1;
167 }
168
169 clc_len = smb2_calc_size(hdr);
170
171 if (4 + len != clc_len) {
172 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
173 clc_len, 4 + len, mid);
174 /* create failed on symlink */
175 if (command == SMB2_CREATE_HE &&
176 hdr->Status == STATUS_STOPPED_ON_SYMLINK)
177 return 0;
178 /* Windows 7 server returns 24 bytes more */
179 if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
180 return 0;
181 /* server can return one byte more due to implied bcc[0] */
182 if (clc_len == 4 + len + 1)
183 return 0;
184
185 /*
186 * MacOS server pads after SMB2.1 write response with 3 bytes
187 * of junk. Other servers match RFC1001 len to actual
188 * SMB2/SMB3 frame length (header + smb2 response specific data)
189 * Log the server error (once), but allow it and continue
190 * since the frame is parseable.
191 */
192 if (clc_len < 4 /* RFC1001 header size */ + len) {
193 printk_once(KERN_WARNING
194 "SMB2 server sent bad RFC1001 len %d not %d\n",
195 len, clc_len - 4);
196 return 0;
197 }
198
199 return 1;
200 }
201 return 0;
202 }
203
204 /*
205 * The size of the variable area depends on the offset and length fields
206 * located in different fields for various SMB2 responses. SMB2 responses
207 * with no variable length info, show an offset of zero for the offset field.
208 */
209 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
210 /* SMB2_NEGOTIATE */ true,
211 /* SMB2_SESSION_SETUP */ true,
212 /* SMB2_LOGOFF */ false,
213 /* SMB2_TREE_CONNECT */ false,
214 /* SMB2_TREE_DISCONNECT */ false,
215 /* SMB2_CREATE */ true,
216 /* SMB2_CLOSE */ false,
217 /* SMB2_FLUSH */ false,
218 /* SMB2_READ */ true,
219 /* SMB2_WRITE */ false,
220 /* SMB2_LOCK */ false,
221 /* SMB2_IOCTL */ true,
222 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
223 /* SMB2_ECHO */ false,
224 /* SMB2_QUERY_DIRECTORY */ true,
225 /* SMB2_CHANGE_NOTIFY */ true,
226 /* SMB2_QUERY_INFO */ true,
227 /* SMB2_SET_INFO */ false,
228 /* SMB2_OPLOCK_BREAK */ false
229 };
230
231 /*
232 * Returns the pointer to the beginning of the data area. Length of the data
233 * area and the offset to it (from the beginning of the smb are also returned.
234 */
235 char *
smb2_get_data_area_len(int * off,int * len,struct smb2_hdr * hdr)236 smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
237 {
238 *off = 0;
239 *len = 0;
240
241 /* error responses do not have data area */
242 if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
243 (((struct smb2_err_rsp *)hdr)->StructureSize) ==
244 SMB2_ERROR_STRUCTURE_SIZE2)
245 return NULL;
246
247 /*
248 * Following commands have data areas so we have to get the location
249 * of the data buffer offset and data buffer length for the particular
250 * command.
251 */
252 switch (hdr->Command) {
253 case SMB2_NEGOTIATE:
254 *off = le16_to_cpu(
255 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
256 *len = le16_to_cpu(
257 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
258 break;
259 case SMB2_SESSION_SETUP:
260 *off = le16_to_cpu(
261 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
262 *len = le16_to_cpu(
263 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
264 break;
265 case SMB2_CREATE:
266 *off = le32_to_cpu(
267 ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
268 *len = le32_to_cpu(
269 ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
270 break;
271 case SMB2_QUERY_INFO:
272 *off = le16_to_cpu(
273 ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
274 *len = le32_to_cpu(
275 ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
276 break;
277 case SMB2_READ:
278 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
279 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
280 break;
281 case SMB2_QUERY_DIRECTORY:
282 *off = le16_to_cpu(
283 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
284 *len = le32_to_cpu(
285 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
286 break;
287 case SMB2_IOCTL:
288 *off = le32_to_cpu(
289 ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
290 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
291 break;
292 case SMB2_CHANGE_NOTIFY:
293 default:
294 /* BB FIXME for unimplemented cases above */
295 cifs_dbg(VFS, "no length check for command\n");
296 break;
297 }
298
299 /*
300 * Invalid length or offset probably means data area is invalid, but
301 * we have little choice but to ignore the data area in this case.
302 */
303 if (*off > 4096) {
304 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
305 *len = 0;
306 *off = 0;
307 } else if (*off < 0) {
308 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
309 *off);
310 *off = 0;
311 *len = 0;
312 } else if (*len < 0) {
313 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
314 *len);
315 *len = 0;
316 } else if (*len > 128 * 1024) {
317 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
318 *len = 0;
319 }
320
321 /* return pointer to beginning of data area, ie offset from SMB start */
322 if ((*off != 0) && (*len != 0))
323 return hdr->ProtocolId + *off;
324 else
325 return NULL;
326 }
327
328 /*
329 * Calculate the size of the SMB message based on the fixed header
330 * portion, the number of word parameters and the data portion of the message.
331 */
332 unsigned int
smb2_calc_size(void * buf)333 smb2_calc_size(void *buf)
334 {
335 struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
336 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
337 int offset; /* the offset from the beginning of SMB to data area */
338 int data_length; /* the length of the variable length data area */
339 /* Structure Size has already been checked to make sure it is 64 */
340 int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
341
342 /*
343 * StructureSize2, ie length of fixed parameter area has already
344 * been checked to make sure it is the correct length.
345 */
346 len += le16_to_cpu(pdu->StructureSize2);
347
348 if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
349 goto calc_size_exit;
350
351 smb2_get_data_area_len(&offset, &data_length, hdr);
352 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
353
354 if (data_length > 0) {
355 /*
356 * Check to make sure that data area begins after fixed area,
357 * Note that last byte of the fixed area is part of data area
358 * for some commands, typically those with odd StructureSize,
359 * so we must add one to the calculation (and 4 to account for
360 * the size of the RFC1001 hdr.
361 */
362 if (offset + 4 + 1 < len) {
363 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
364 offset + 4 + 1, len);
365 data_length = 0;
366 } else {
367 len = 4 + offset + data_length;
368 }
369 }
370 calc_size_exit:
371 cifs_dbg(FYI, "SMB2 len %d\n", len);
372 return len;
373 }
374
375 /* Note: caller must free return buffer */
376 __le16 *
cifs_convert_path_to_utf16(const char * from,struct cifs_sb_info * cifs_sb)377 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
378 {
379 int len;
380 const char *start_of_path;
381 __le16 *to;
382 int map_type;
383
384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
385 map_type = SFM_MAP_UNI_RSVD;
386 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
387 map_type = SFU_MAP_UNI_RSVD;
388 else
389 map_type = NO_MAP_UNI_RSVD;
390
391 /* Windows doesn't allow paths beginning with \ */
392 if (from[0] == '\\')
393 start_of_path = from + 1;
394 else
395 start_of_path = from;
396 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
397 cifs_sb->local_nls, map_type);
398 return to;
399 }
400
401 __le32
smb2_get_lease_state(struct cifsInodeInfo * cinode)402 smb2_get_lease_state(struct cifsInodeInfo *cinode)
403 {
404 __le32 lease = 0;
405
406 if (CIFS_CACHE_WRITE(cinode))
407 lease |= SMB2_LEASE_WRITE_CACHING;
408 if (CIFS_CACHE_HANDLE(cinode))
409 lease |= SMB2_LEASE_HANDLE_CACHING;
410 if (CIFS_CACHE_READ(cinode))
411 lease |= SMB2_LEASE_READ_CACHING;
412 return lease;
413 }
414
415 struct smb2_lease_break_work {
416 struct work_struct lease_break;
417 struct tcon_link *tlink;
418 __u8 lease_key[16];
419 __le32 lease_state;
420 };
421
422 static void
cifs_ses_oplock_break(struct work_struct * work)423 cifs_ses_oplock_break(struct work_struct *work)
424 {
425 struct smb2_lease_break_work *lw = container_of(work,
426 struct smb2_lease_break_work, lease_break);
427 int rc;
428
429 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
430 lw->lease_state);
431 cifs_dbg(FYI, "Lease release rc %d\n", rc);
432 cifs_put_tlink(lw->tlink);
433 kfree(lw);
434 }
435
436 static bool
smb2_tcon_has_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp,struct smb2_lease_break_work * lw)437 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
438 struct smb2_lease_break_work *lw)
439 {
440 bool found;
441 __u8 lease_state;
442 struct list_head *tmp;
443 struct cifsFileInfo *cfile;
444 struct TCP_Server_Info *server = tcon->ses->server;
445 struct cifs_pending_open *open;
446 struct cifsInodeInfo *cinode;
447 int ack_req = le32_to_cpu(rsp->Flags &
448 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
449
450 lease_state = le32_to_cpu(rsp->NewLeaseState);
451
452 list_for_each(tmp, &tcon->openFileList) {
453 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
454 cinode = CIFS_I(cfile->dentry->d_inode);
455
456 if (memcmp(cinode->lease_key, rsp->LeaseKey,
457 SMB2_LEASE_KEY_SIZE))
458 continue;
459
460 cifs_dbg(FYI, "found in the open list\n");
461 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
462 le32_to_cpu(rsp->NewLeaseState));
463
464 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
465
466 if (ack_req)
467 cfile->oplock_break_cancelled = false;
468 else
469 cfile->oplock_break_cancelled = true;
470
471 queue_work(cifsiod_wq, &cfile->oplock_break);
472 kfree(lw);
473 return true;
474 }
475
476 found = false;
477 list_for_each_entry(open, &tcon->pending_opens, olist) {
478 if (memcmp(open->lease_key, rsp->LeaseKey,
479 SMB2_LEASE_KEY_SIZE))
480 continue;
481
482 if (!found && ack_req) {
483 found = true;
484 memcpy(lw->lease_key, open->lease_key,
485 SMB2_LEASE_KEY_SIZE);
486 lw->tlink = cifs_get_tlink(open->tlink);
487 queue_work(cifsiod_wq, &lw->lease_break);
488 }
489
490 cifs_dbg(FYI, "found in the pending open list\n");
491 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
492 le32_to_cpu(rsp->NewLeaseState));
493
494 open->oplock = lease_state;
495 }
496 return found;
497 }
498
499 static bool
smb2_is_valid_lease_break(char * buffer)500 smb2_is_valid_lease_break(char *buffer)
501 {
502 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
503 struct list_head *tmp, *tmp1, *tmp2;
504 struct TCP_Server_Info *server;
505 struct cifs_ses *ses;
506 struct cifs_tcon *tcon;
507 struct smb2_lease_break_work *lw;
508
509 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
510 if (!lw)
511 return false;
512
513 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
514 lw->lease_state = rsp->NewLeaseState;
515
516 cifs_dbg(FYI, "Checking for lease break\n");
517
518 /* look up tcon based on tid & uid */
519 spin_lock(&cifs_tcp_ses_lock);
520 list_for_each(tmp, &cifs_tcp_ses_list) {
521 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
522
523 list_for_each(tmp1, &server->smb_ses_list) {
524 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
525
526 spin_lock(&cifs_file_list_lock);
527 list_for_each(tmp2, &ses->tcon_list) {
528 tcon = list_entry(tmp2, struct cifs_tcon,
529 tcon_list);
530 cifs_stats_inc(
531 &tcon->stats.cifs_stats.num_oplock_brks);
532 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
533 spin_unlock(&cifs_file_list_lock);
534 spin_unlock(&cifs_tcp_ses_lock);
535 return true;
536 }
537 }
538 spin_unlock(&cifs_file_list_lock);
539 }
540 }
541 spin_unlock(&cifs_tcp_ses_lock);
542 kfree(lw);
543 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
544 return false;
545 }
546
547 bool
smb2_is_valid_oplock_break(char * buffer,struct TCP_Server_Info * server)548 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
549 {
550 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
551 struct list_head *tmp, *tmp1, *tmp2;
552 struct cifs_ses *ses;
553 struct cifs_tcon *tcon;
554 struct cifsInodeInfo *cinode;
555 struct cifsFileInfo *cfile;
556
557 cifs_dbg(FYI, "Checking for oplock break\n");
558
559 if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
560 return false;
561
562 if (rsp->StructureSize !=
563 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
564 if (le16_to_cpu(rsp->StructureSize) == 44)
565 return smb2_is_valid_lease_break(buffer);
566 else
567 return false;
568 }
569
570 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
571
572 /* look up tcon based on tid & uid */
573 spin_lock(&cifs_tcp_ses_lock);
574 list_for_each(tmp, &server->smb_ses_list) {
575 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
576 list_for_each(tmp1, &ses->tcon_list) {
577 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
578
579 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
580 spin_lock(&cifs_file_list_lock);
581 list_for_each(tmp2, &tcon->openFileList) {
582 cfile = list_entry(tmp2, struct cifsFileInfo,
583 tlist);
584 if (rsp->PersistentFid !=
585 cfile->fid.persistent_fid ||
586 rsp->VolatileFid !=
587 cfile->fid.volatile_fid)
588 continue;
589
590 cifs_dbg(FYI, "file id match, oplock break\n");
591 cinode = CIFS_I(cfile->dentry->d_inode);
592
593 if (!CIFS_CACHE_WRITE(cinode) &&
594 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
595 cfile->oplock_break_cancelled = true;
596 else
597 cfile->oplock_break_cancelled = false;
598
599 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
600 &cinode->flags);
601
602 /*
603 * Set flag if the server downgrades the oplock
604 * to L2 else clear.
605 */
606 if (rsp->OplockLevel)
607 set_bit(
608 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
609 &cinode->flags);
610 else
611 clear_bit(
612 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
613 &cinode->flags);
614
615 queue_work(cifsiod_wq, &cfile->oplock_break);
616
617 spin_unlock(&cifs_file_list_lock);
618 spin_unlock(&cifs_tcp_ses_lock);
619 return true;
620 }
621 spin_unlock(&cifs_file_list_lock);
622 spin_unlock(&cifs_tcp_ses_lock);
623 cifs_dbg(FYI, "No matching file for oplock break\n");
624 return true;
625 }
626 }
627 spin_unlock(&cifs_tcp_ses_lock);
628 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
629 return false;
630 }
631
632 void
smb2_cancelled_close_fid(struct work_struct * work)633 smb2_cancelled_close_fid(struct work_struct *work)
634 {
635 struct close_cancelled_open *cancelled = container_of(work,
636 struct close_cancelled_open, work);
637
638 cifs_dbg(VFS, "Close unmatched open\n");
639
640 SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
641 cancelled->fid.volatile_fid);
642 cifs_put_tcon(cancelled->tcon);
643 kfree(cancelled);
644 }
645
646 int
smb2_handle_cancelled_mid(char * buffer,struct TCP_Server_Info * server)647 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
648 {
649 struct smb2_hdr *hdr = (struct smb2_hdr *)buffer;
650 struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
651 struct cifs_tcon *tcon;
652 struct close_cancelled_open *cancelled;
653
654 if (hdr->Command != SMB2_CREATE || hdr->Status != STATUS_SUCCESS)
655 return 0;
656
657 cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
658 if (!cancelled)
659 return -ENOMEM;
660
661 tcon = smb2_find_smb_tcon(server, hdr->SessionId, hdr->TreeId);
662 if (!tcon) {
663 kfree(cancelled);
664 return -ENOENT;
665 }
666
667 cancelled->fid.persistent_fid = rsp->PersistentFileId;
668 cancelled->fid.volatile_fid = rsp->VolatileFileId;
669 cancelled->tcon = tcon;
670 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
671 queue_work(cifsiod_wq, &cancelled->work);
672
673 return 0;
674 }
675