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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#include "smb2glob.h"
32
33static int
34check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid)
35{
36 __u64 wire_mid = le64_to_cpu(shdr->MessageId);
37
38 /*
39 * Make sure that this really is an SMB, that it is a response,
40 * and that the message ids match.
41 */
42 if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
43 (mid == wire_mid)) {
44 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
45 return 0;
46 else {
47 /* only one valid case where server sends us request */
48 if (shdr->Command == SMB2_OPLOCK_BREAK)
49 return 0;
50 else
51 cifs_dbg(VFS, "Received Request not response\n");
52 }
53 } else { /* bad signature or mid */
54 if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
55 cifs_dbg(VFS, "Bad protocol string signature header %x\n",
56 le32_to_cpu(shdr->ProtocolId));
57 if (mid != wire_mid)
58 cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
59 mid, wire_mid);
60 }
61 cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
62 return 1;
63}
64
65/*
66 * The following table defines the expected "StructureSize" of SMB2 responses
67 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
68 *
69 * Note that commands are defined in smb2pdu.h in le16 but the array below is
70 * indexed by command in host byte order
71 */
72static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
73 /* SMB2_NEGOTIATE */ cpu_to_le16(65),
74 /* SMB2_SESSION_SETUP */ cpu_to_le16(9),
75 /* SMB2_LOGOFF */ cpu_to_le16(4),
76 /* SMB2_TREE_CONNECT */ cpu_to_le16(16),
77 /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
78 /* SMB2_CREATE */ cpu_to_le16(89),
79 /* SMB2_CLOSE */ cpu_to_le16(60),
80 /* SMB2_FLUSH */ cpu_to_le16(4),
81 /* SMB2_READ */ cpu_to_le16(17),
82 /* SMB2_WRITE */ cpu_to_le16(17),
83 /* SMB2_LOCK */ cpu_to_le16(4),
84 /* SMB2_IOCTL */ cpu_to_le16(49),
85 /* BB CHECK this ... not listed in documentation */
86 /* SMB2_CANCEL */ cpu_to_le16(0),
87 /* SMB2_ECHO */ cpu_to_le16(4),
88 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
89 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
90 /* SMB2_QUERY_INFO */ cpu_to_le16(9),
91 /* SMB2_SET_INFO */ cpu_to_le16(2),
92 /* BB FIXME can also be 44 for lease break */
93 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
94};
95
96#ifdef CONFIG_CIFS_SMB311
97static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len, __u32 non_ctxlen,
98 size_t hdr_preamble_size)
99{
100 __u16 neg_count;
101 __u32 nc_offset, size_of_pad_before_neg_ctxts;
102 struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
103
104 /* Negotiate contexts are only valid for latest dialect SMB3.11 */
105 neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
106 if ((neg_count == 0) ||
107 (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
108 return 0;
109
110 /* Make sure that negotiate contexts start after gss security blob */
111 nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
112 if (nc_offset < non_ctxlen - hdr_preamble_size /* RFC1001 len */) {
113 printk_once(KERN_WARNING "invalid negotiate context offset\n");
114 return 0;
115 }
116 size_of_pad_before_neg_ctxts = nc_offset -
117 (non_ctxlen - hdr_preamble_size);
118
119 /* Verify that at least minimal negotiate contexts fit within frame */
120 if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
121 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
122 return 0;
123 }
124
125 cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
126 len - nc_offset, size_of_pad_before_neg_ctxts);
127
128 /* length of negcontexts including pad from end of sec blob to them */
129 return (len - nc_offset) + size_of_pad_before_neg_ctxts;
130}
131#endif /* CIFS_SMB311 */
132
133int
134smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
135{
136 struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
137 struct smb2_hdr *hdr = &pdu->hdr;
138 struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
139 __u64 mid;
140 __u32 len = get_rfc1002_length(buf);
141 __u32 clc_len; /* calculated length */
142 int command;
143
144 /* BB disable following printk later */
145 cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
146 __func__, length, len);
147
148 /*
149 * Add function to do table lookup of StructureSize by command
150 * ie Validate the wct via smb2_struct_sizes table above
151 */
152
153 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
154 struct smb2_transform_hdr *thdr =
155 (struct smb2_transform_hdr *)buf;
156 struct cifs_ses *ses = NULL;
157 struct list_head *tmp;
158
159 /* decrypt frame now that it is completely read in */
160 spin_lock(&cifs_tcp_ses_lock);
161 list_for_each(tmp, &srvr->smb_ses_list) {
162 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
163 if (ses->Suid == thdr->SessionId)
164 break;
165
166 ses = NULL;
167 }
168 spin_unlock(&cifs_tcp_ses_lock);
169 if (ses == NULL) {
170 cifs_dbg(VFS, "no decryption - session id not found\n");
171 return 1;
172 }
173 }
174
175 mid = le64_to_cpu(shdr->MessageId);
176 if (length < sizeof(struct smb2_pdu)) {
177 if ((length >= sizeof(struct smb2_hdr))
178 && (shdr->Status != 0)) {
179 pdu->StructureSize2 = 0;
180 /*
181 * As with SMB/CIFS, on some error cases servers may
182 * not return wct properly
183 */
184 return 0;
185 } else {
186 cifs_dbg(VFS, "Length less than SMB header size\n");
187 }
188 return 1;
189 }
190 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE -
191 srvr->vals->header_preamble_size) {
192 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
193 mid);
194 return 1;
195 }
196
197 if (check_smb2_hdr(shdr, mid))
198 return 1;
199
200 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
201 cifs_dbg(VFS, "Illegal structure size %u\n",
202 le16_to_cpu(shdr->StructureSize));
203 return 1;
204 }
205
206 command = le16_to_cpu(shdr->Command);
207 if (command >= NUMBER_OF_SMB2_COMMANDS) {
208 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
209 return 1;
210 }
211
212 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
213 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
214 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
215 /* error packets have 9 byte structure size */
216 cifs_dbg(VFS, "Illegal response size %u for command %d\n",
217 le16_to_cpu(pdu->StructureSize2), command);
218 return 1;
219 } else if (command == SMB2_OPLOCK_BREAK_HE
220 && (shdr->Status == 0)
221 && (le16_to_cpu(pdu->StructureSize2) != 44)
222 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
223 /* special case for SMB2.1 lease break message */
224 cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
225 le16_to_cpu(pdu->StructureSize2));
226 return 1;
227 }
228 }
229
230 if (srvr->vals->header_preamble_size + len != length) {
231 cifs_dbg(VFS, "Total length %u RFC1002 length %zu mismatch mid %llu\n",
232 length, srvr->vals->header_preamble_size + len, mid);
233 return 1;
234 }
235
236 clc_len = smb2_calc_size(hdr);
237
238#ifdef CONFIG_CIFS_SMB311
239 if (shdr->Command == SMB2_NEGOTIATE)
240 clc_len += get_neg_ctxt_len(hdr, len, clc_len,
241 srvr->vals->header_preamble_size);
242#endif /* SMB311 */
243 if (srvr->vals->header_preamble_size + len != clc_len) {
244 cifs_dbg(FYI, "Calculated size %u length %zu mismatch mid %llu\n",
245 clc_len, srvr->vals->header_preamble_size + len, mid);
246 /* create failed on symlink */
247 if (command == SMB2_CREATE_HE &&
248 shdr->Status == STATUS_STOPPED_ON_SYMLINK)
249 return 0;
250 /* Windows 7 server returns 24 bytes more */
251 if (clc_len + 24 - srvr->vals->header_preamble_size == len && command == SMB2_OPLOCK_BREAK_HE)
252 return 0;
253 /* server can return one byte more due to implied bcc[0] */
254 if (clc_len == srvr->vals->header_preamble_size + len + 1)
255 return 0;
256
257 /*
258 * MacOS server pads after SMB2.1 write response with 3 bytes
259 * of junk. Other servers match RFC1001 len to actual
260 * SMB2/SMB3 frame length (header + smb2 response specific data)
261 * Log the server error (once), but allow it and continue
262 * since the frame is parseable.
263 */
264 if (clc_len < srvr->vals->header_preamble_size /* RFC1001 header size */ + len) {
265 printk_once(KERN_WARNING
266 "SMB2 server sent bad RFC1001 len %d not %zu\n",
267 len, clc_len - srvr->vals->header_preamble_size);
268 return 0;
269 }
270
271 return 1;
272 }
273 return 0;
274}
275
276/*
277 * The size of the variable area depends on the offset and length fields
278 * located in different fields for various SMB2 responses. SMB2 responses
279 * with no variable length info, show an offset of zero for the offset field.
280 */
281static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
282 /* SMB2_NEGOTIATE */ true,
283 /* SMB2_SESSION_SETUP */ true,
284 /* SMB2_LOGOFF */ false,
285 /* SMB2_TREE_CONNECT */ false,
286 /* SMB2_TREE_DISCONNECT */ false,
287 /* SMB2_CREATE */ true,
288 /* SMB2_CLOSE */ false,
289 /* SMB2_FLUSH */ false,
290 /* SMB2_READ */ true,
291 /* SMB2_WRITE */ false,
292 /* SMB2_LOCK */ false,
293 /* SMB2_IOCTL */ true,
294 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
295 /* SMB2_ECHO */ false,
296 /* SMB2_QUERY_DIRECTORY */ true,
297 /* SMB2_CHANGE_NOTIFY */ true,
298 /* SMB2_QUERY_INFO */ true,
299 /* SMB2_SET_INFO */ false,
300 /* SMB2_OPLOCK_BREAK */ false
301};
302
303/*
304 * Returns the pointer to the beginning of the data area. Length of the data
305 * area and the offset to it (from the beginning of the smb are also returned.
306 */
307char *
308smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
309{
310 struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
311 *off = 0;
312 *len = 0;
313
314 /* error responses do not have data area */
315 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
316 (((struct smb2_err_rsp *)hdr)->StructureSize) ==
317 SMB2_ERROR_STRUCTURE_SIZE2)
318 return NULL;
319
320 /*
321 * Following commands have data areas so we have to get the location
322 * of the data buffer offset and data buffer length for the particular
323 * command.
324 */
325 switch (shdr->Command) {
326 case SMB2_NEGOTIATE:
327 *off = le16_to_cpu(
328 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
329 *len = le16_to_cpu(
330 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
331 break;
332 case SMB2_SESSION_SETUP:
333 *off = le16_to_cpu(
334 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
335 *len = le16_to_cpu(
336 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
337 break;
338 case SMB2_CREATE:
339 *off = le32_to_cpu(
340 ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
341 *len = le32_to_cpu(
342 ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
343 break;
344 case SMB2_QUERY_INFO:
345 *off = le16_to_cpu(
346 ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
347 *len = le32_to_cpu(
348 ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
349 break;
350 case SMB2_READ:
351 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
352 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
353 break;
354 case SMB2_QUERY_DIRECTORY:
355 *off = le16_to_cpu(
356 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
357 *len = le32_to_cpu(
358 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
359 break;
360 case SMB2_IOCTL:
361 *off = le32_to_cpu(
362 ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
363 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
364 break;
365 case SMB2_CHANGE_NOTIFY:
366 default:
367 /* BB FIXME for unimplemented cases above */
368 cifs_dbg(VFS, "no length check for command\n");
369 break;
370 }
371
372 /*
373 * Invalid length or offset probably means data area is invalid, but
374 * we have little choice but to ignore the data area in this case.
375 */
376 if (*off > 4096) {
377 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
378 *len = 0;
379 *off = 0;
380 } else if (*off < 0) {
381 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
382 *off);
383 *off = 0;
384 *len = 0;
385 } else if (*len < 0) {
386 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
387 *len);
388 *len = 0;
389 } else if (*len > 128 * 1024) {
390 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
391 *len = 0;
392 }
393
394 /* return pointer to beginning of data area, ie offset from SMB start */
395 if ((*off != 0) && (*len != 0))
396 return (char *)shdr + *off;
397 else
398 return NULL;
399}
400
401/*
402 * Calculate the size of the SMB message based on the fixed header
403 * portion, the number of word parameters and the data portion of the message.
404 */
405unsigned int
406smb2_calc_size(void *buf)
407{
408 struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
409 struct smb2_hdr *hdr = &pdu->hdr;
410 struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
411 int offset; /* the offset from the beginning of SMB to data area */
412 int data_length; /* the length of the variable length data area */
413 /* Structure Size has already been checked to make sure it is 64 */
414 int len = 4 + le16_to_cpu(shdr->StructureSize);
415
416 /*
417 * StructureSize2, ie length of fixed parameter area has already
418 * been checked to make sure it is the correct length.
419 */
420 len += le16_to_cpu(pdu->StructureSize2);
421
422 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
423 goto calc_size_exit;
424
425 smb2_get_data_area_len(&offset, &data_length, hdr);
426 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
427
428 if (data_length > 0) {
429 /*
430 * Check to make sure that data area begins after fixed area,
431 * Note that last byte of the fixed area is part of data area
432 * for some commands, typically those with odd StructureSize,
433 * so we must add one to the calculation (and 4 to account for
434 * the size of the RFC1001 hdr.
435 */
436 if (offset + 4 + 1 < len) {
437 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
438 offset + 4 + 1, len);
439 data_length = 0;
440 } else {
441 len = 4 + offset + data_length;
442 }
443 }
444calc_size_exit:
445 cifs_dbg(FYI, "SMB2 len %d\n", len);
446 return len;
447}
448
449/* Note: caller must free return buffer */
450__le16 *
451cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
452{
453 int len;
454 const char *start_of_path;
455 __le16 *to;
456 int map_type;
457
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
459 map_type = SFM_MAP_UNI_RSVD;
460 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
461 map_type = SFU_MAP_UNI_RSVD;
462 else
463 map_type = NO_MAP_UNI_RSVD;
464
465 /* Windows doesn't allow paths beginning with \ */
466 if (from[0] == '\\')
467 start_of_path = from + 1;
468 else
469 start_of_path = from;
470 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
471 cifs_sb->local_nls, map_type);
472 return to;
473}
474
475__le32
476smb2_get_lease_state(struct cifsInodeInfo *cinode)
477{
478 __le32 lease = 0;
479
480 if (CIFS_CACHE_WRITE(cinode))
481 lease |= SMB2_LEASE_WRITE_CACHING;
482 if (CIFS_CACHE_HANDLE(cinode))
483 lease |= SMB2_LEASE_HANDLE_CACHING;
484 if (CIFS_CACHE_READ(cinode))
485 lease |= SMB2_LEASE_READ_CACHING;
486 return lease;
487}
488
489struct smb2_lease_break_work {
490 struct work_struct lease_break;
491 struct tcon_link *tlink;
492 __u8 lease_key[16];
493 __le32 lease_state;
494};
495
496static void
497cifs_ses_oplock_break(struct work_struct *work)
498{
499 struct smb2_lease_break_work *lw = container_of(work,
500 struct smb2_lease_break_work, lease_break);
501 int rc;
502
503 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
504 lw->lease_state);
505 cifs_dbg(FYI, "Lease release rc %d\n", rc);
506 cifs_put_tlink(lw->tlink);
507 kfree(lw);
508}
509
510static bool
511smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
512 struct smb2_lease_break_work *lw)
513{
514 bool found;
515 __u8 lease_state;
516 struct list_head *tmp;
517 struct cifsFileInfo *cfile;
518 struct TCP_Server_Info *server = tcon->ses->server;
519 struct cifs_pending_open *open;
520 struct cifsInodeInfo *cinode;
521 int ack_req = le32_to_cpu(rsp->Flags &
522 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
523
524 lease_state = le32_to_cpu(rsp->NewLeaseState);
525
526 list_for_each(tmp, &tcon->openFileList) {
527 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
528 cinode = CIFS_I(d_inode(cfile->dentry));
529
530 if (memcmp(cinode->lease_key, rsp->LeaseKey,
531 SMB2_LEASE_KEY_SIZE))
532 continue;
533
534 cifs_dbg(FYI, "found in the open list\n");
535 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
536 le32_to_cpu(rsp->NewLeaseState));
537
538 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
539
540 if (ack_req)
541 cfile->oplock_break_cancelled = false;
542 else
543 cfile->oplock_break_cancelled = true;
544
545 queue_work(cifsoplockd_wq, &cfile->oplock_break);
546 kfree(lw);
547 return true;
548 }
549
550 found = false;
551 list_for_each_entry(open, &tcon->pending_opens, olist) {
552 if (memcmp(open->lease_key, rsp->LeaseKey,
553 SMB2_LEASE_KEY_SIZE))
554 continue;
555
556 if (!found && ack_req) {
557 found = true;
558 memcpy(lw->lease_key, open->lease_key,
559 SMB2_LEASE_KEY_SIZE);
560 lw->tlink = cifs_get_tlink(open->tlink);
561 queue_work(cifsiod_wq, &lw->lease_break);
562 }
563
564 cifs_dbg(FYI, "found in the pending open list\n");
565 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
566 le32_to_cpu(rsp->NewLeaseState));
567
568 open->oplock = lease_state;
569 }
570 return found;
571}
572
573static bool
574smb2_is_valid_lease_break(char *buffer)
575{
576 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
577 struct list_head *tmp, *tmp1, *tmp2;
578 struct TCP_Server_Info *server;
579 struct cifs_ses *ses;
580 struct cifs_tcon *tcon;
581 struct smb2_lease_break_work *lw;
582
583 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
584 if (!lw)
585 return false;
586
587 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
588 lw->lease_state = rsp->NewLeaseState;
589
590 cifs_dbg(FYI, "Checking for lease break\n");
591
592 /* look up tcon based on tid & uid */
593 spin_lock(&cifs_tcp_ses_lock);
594 list_for_each(tmp, &cifs_tcp_ses_list) {
595 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
596
597 list_for_each(tmp1, &server->smb_ses_list) {
598 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
599
600 list_for_each(tmp2, &ses->tcon_list) {
601 tcon = list_entry(tmp2, struct cifs_tcon,
602 tcon_list);
603 spin_lock(&tcon->open_file_lock);
604 cifs_stats_inc(
605 &tcon->stats.cifs_stats.num_oplock_brks);
606 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
607 spin_unlock(&tcon->open_file_lock);
608 spin_unlock(&cifs_tcp_ses_lock);
609 return true;
610 }
611 spin_unlock(&tcon->open_file_lock);
612 }
613 }
614 }
615 spin_unlock(&cifs_tcp_ses_lock);
616 kfree(lw);
617 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
618 return false;
619}
620
621bool
622smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
623{
624 struct smb2_oplock_break_rsp *rsp = (struct smb2_oplock_break_rsp *)buffer;
625 struct list_head *tmp, *tmp1, *tmp2;
626 struct cifs_ses *ses;
627 struct cifs_tcon *tcon;
628 struct cifsInodeInfo *cinode;
629 struct cifsFileInfo *cfile;
630
631 cifs_dbg(FYI, "Checking for oplock break\n");
632
633 if (rsp->hdr.sync_hdr.Command != SMB2_OPLOCK_BREAK)
634 return false;
635
636 if (rsp->StructureSize !=
637 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
638 if (le16_to_cpu(rsp->StructureSize) == 44)
639 return smb2_is_valid_lease_break(buffer);
640 else
641 return false;
642 }
643
644 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
645
646 /* look up tcon based on tid & uid */
647 spin_lock(&cifs_tcp_ses_lock);
648 list_for_each(tmp, &server->smb_ses_list) {
649 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
650 list_for_each(tmp1, &ses->tcon_list) {
651 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
652
653 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
654 spin_lock(&tcon->open_file_lock);
655 list_for_each(tmp2, &tcon->openFileList) {
656 cfile = list_entry(tmp2, struct cifsFileInfo,
657 tlist);
658 if (rsp->PersistentFid !=
659 cfile->fid.persistent_fid ||
660 rsp->VolatileFid !=
661 cfile->fid.volatile_fid)
662 continue;
663
664 cifs_dbg(FYI, "file id match, oplock break\n");
665 cinode = CIFS_I(d_inode(cfile->dentry));
666 spin_lock(&cfile->file_info_lock);
667 if (!CIFS_CACHE_WRITE(cinode) &&
668 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
669 cfile->oplock_break_cancelled = true;
670 else
671 cfile->oplock_break_cancelled = false;
672
673 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
674 &cinode->flags);
675
676 /*
677 * Set flag if the server downgrades the oplock
678 * to L2 else clear.
679 */
680 if (rsp->OplockLevel)
681 set_bit(
682 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
683 &cinode->flags);
684 else
685 clear_bit(
686 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
687 &cinode->flags);
688 spin_unlock(&cfile->file_info_lock);
689 queue_work(cifsoplockd_wq,
690 &cfile->oplock_break);
691
692 spin_unlock(&tcon->open_file_lock);
693 spin_unlock(&cifs_tcp_ses_lock);
694 return true;
695 }
696 spin_unlock(&tcon->open_file_lock);
697 spin_unlock(&cifs_tcp_ses_lock);
698 cifs_dbg(FYI, "No matching file for oplock break\n");
699 return true;
700 }
701 }
702 spin_unlock(&cifs_tcp_ses_lock);
703 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
704 return false;
705}
706
707void
708smb2_cancelled_close_fid(struct work_struct *work)
709{
710 struct close_cancelled_open *cancelled = container_of(work,
711 struct close_cancelled_open, work);
712
713 cifs_dbg(VFS, "Close unmatched open\n");
714
715 SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
716 cancelled->fid.volatile_fid);
717 cifs_put_tcon(cancelled->tcon);
718 kfree(cancelled);
719}
720
721int
722smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
723{
724 struct smb2_sync_hdr *sync_hdr = get_sync_hdr(buffer);
725 struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
726 struct cifs_tcon *tcon;
727 struct close_cancelled_open *cancelled;
728
729 if (sync_hdr->Command != SMB2_CREATE ||
730 sync_hdr->Status != STATUS_SUCCESS)
731 return 0;
732
733 cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
734 if (!cancelled)
735 return -ENOMEM;
736
737 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
738 sync_hdr->TreeId);
739 if (!tcon) {
740 kfree(cancelled);
741 return -ENOENT;
742 }
743
744 cancelled->fid.persistent_fid = rsp->PersistentFileId;
745 cancelled->fid.volatile_fid = rsp->VolatileFileId;
746 cancelled->tcon = tcon;
747 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
748 queue_work(cifsiod_wq, &cancelled->work);
749
750 return 0;
751}
752
753#ifdef CONFIG_CIFS_SMB311
754/**
755 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
756 *
757 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
758 * SMB2 header.
759 */
760int
761smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
762{
763 int i, rc;
764 struct sdesc *d;
765 struct smb2_sync_hdr *hdr;
766
767 if (ses->server->tcpStatus == CifsGood) {
768 /* skip non smb311 connections */
769 if (ses->server->dialect != SMB311_PROT_ID)
770 return 0;
771
772 /* skip last sess setup response */
773 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
774 if (hdr->Flags & SMB2_FLAGS_SIGNED)
775 return 0;
776 }
777
778 rc = smb311_crypto_shash_allocate(ses->server);
779 if (rc)
780 return rc;
781
782 d = ses->server->secmech.sdescsha512;
783 rc = crypto_shash_init(&d->shash);
784 if (rc) {
785 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
786 return rc;
787 }
788
789 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
790 SMB2_PREAUTH_HASH_SIZE);
791 if (rc) {
792 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
793 return rc;
794 }
795
796 for (i = 0; i < nvec; i++) {
797 rc = crypto_shash_update(&d->shash,
798 iov[i].iov_base, iov[i].iov_len);
799 if (rc) {
800 cifs_dbg(VFS, "%s: could not update sha512 shash\n",
801 __func__);
802 return rc;
803 }
804 }
805
806 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
807 if (rc) {
808 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
809 __func__);
810 return rc;
811 }
812
813 return 0;
814}
815#endif
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
32static int
33check_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 */
69static 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
93int
94smb2_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 */
182 if (clc_len == 4 + len + 1)
183 return 0;
184 return 1;
185 }
186 return 0;
187}
188
189/*
190 * The size of the variable area depends on the offset and length fields
191 * located in different fields for various SMB2 responses. SMB2 responses
192 * with no variable length info, show an offset of zero for the offset field.
193 */
194static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
195 /* SMB2_NEGOTIATE */ true,
196 /* SMB2_SESSION_SETUP */ true,
197 /* SMB2_LOGOFF */ false,
198 /* SMB2_TREE_CONNECT */ false,
199 /* SMB2_TREE_DISCONNECT */ false,
200 /* SMB2_CREATE */ true,
201 /* SMB2_CLOSE */ false,
202 /* SMB2_FLUSH */ false,
203 /* SMB2_READ */ true,
204 /* SMB2_WRITE */ false,
205 /* SMB2_LOCK */ false,
206 /* SMB2_IOCTL */ true,
207 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
208 /* SMB2_ECHO */ false,
209 /* SMB2_QUERY_DIRECTORY */ true,
210 /* SMB2_CHANGE_NOTIFY */ true,
211 /* SMB2_QUERY_INFO */ true,
212 /* SMB2_SET_INFO */ false,
213 /* SMB2_OPLOCK_BREAK */ false
214};
215
216/*
217 * Returns the pointer to the beginning of the data area. Length of the data
218 * area and the offset to it (from the beginning of the smb are also returned.
219 */
220char *
221smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
222{
223 *off = 0;
224 *len = 0;
225
226 /* error responses do not have data area */
227 if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
228 (((struct smb2_err_rsp *)hdr)->StructureSize) ==
229 SMB2_ERROR_STRUCTURE_SIZE2)
230 return NULL;
231
232 /*
233 * Following commands have data areas so we have to get the location
234 * of the data buffer offset and data buffer length for the particular
235 * command.
236 */
237 switch (hdr->Command) {
238 case SMB2_NEGOTIATE:
239 *off = le16_to_cpu(
240 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
241 *len = le16_to_cpu(
242 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
243 break;
244 case SMB2_SESSION_SETUP:
245 *off = le16_to_cpu(
246 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
247 *len = le16_to_cpu(
248 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
249 break;
250 case SMB2_CREATE:
251 *off = le32_to_cpu(
252 ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
253 *len = le32_to_cpu(
254 ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
255 break;
256 case SMB2_QUERY_INFO:
257 *off = le16_to_cpu(
258 ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
259 *len = le32_to_cpu(
260 ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
261 break;
262 case SMB2_READ:
263 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
264 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
265 break;
266 case SMB2_QUERY_DIRECTORY:
267 *off = le16_to_cpu(
268 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
269 *len = le32_to_cpu(
270 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
271 break;
272 case SMB2_IOCTL:
273 *off = le32_to_cpu(
274 ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
275 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
276 break;
277 case SMB2_CHANGE_NOTIFY:
278 default:
279 /* BB FIXME for unimplemented cases above */
280 cifs_dbg(VFS, "no length check for command\n");
281 break;
282 }
283
284 /*
285 * Invalid length or offset probably means data area is invalid, but
286 * we have little choice but to ignore the data area in this case.
287 */
288 if (*off > 4096) {
289 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
290 *len = 0;
291 *off = 0;
292 } else if (*off < 0) {
293 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
294 *off);
295 *off = 0;
296 *len = 0;
297 } else if (*len < 0) {
298 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
299 *len);
300 *len = 0;
301 } else if (*len > 128 * 1024) {
302 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
303 *len = 0;
304 }
305
306 /* return pointer to beginning of data area, ie offset from SMB start */
307 if ((*off != 0) && (*len != 0))
308 return hdr->ProtocolId + *off;
309 else
310 return NULL;
311}
312
313/*
314 * Calculate the size of the SMB message based on the fixed header
315 * portion, the number of word parameters and the data portion of the message.
316 */
317unsigned int
318smb2_calc_size(void *buf)
319{
320 struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
321 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
322 int offset; /* the offset from the beginning of SMB to data area */
323 int data_length; /* the length of the variable length data area */
324 /* Structure Size has already been checked to make sure it is 64 */
325 int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
326
327 /*
328 * StructureSize2, ie length of fixed parameter area has already
329 * been checked to make sure it is the correct length.
330 */
331 len += le16_to_cpu(pdu->StructureSize2);
332
333 if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
334 goto calc_size_exit;
335
336 smb2_get_data_area_len(&offset, &data_length, hdr);
337 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
338
339 if (data_length > 0) {
340 /*
341 * Check to make sure that data area begins after fixed area,
342 * Note that last byte of the fixed area is part of data area
343 * for some commands, typically those with odd StructureSize,
344 * so we must add one to the calculation (and 4 to account for
345 * the size of the RFC1001 hdr.
346 */
347 if (offset + 4 + 1 < len) {
348 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
349 offset + 4 + 1, len);
350 data_length = 0;
351 } else {
352 len = 4 + offset + data_length;
353 }
354 }
355calc_size_exit:
356 cifs_dbg(FYI, "SMB2 len %d\n", len);
357 return len;
358}
359
360/* Note: caller must free return buffer */
361__le16 *
362cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
363{
364 int len;
365 const char *start_of_path;
366 __le16 *to;
367
368 /* Windows doesn't allow paths beginning with \ */
369 if (from[0] == '\\')
370 start_of_path = from + 1;
371 else
372 start_of_path = from;
373 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
374 cifs_sb->local_nls,
375 cifs_sb->mnt_cifs_flags &
376 CIFS_MOUNT_MAP_SPECIAL_CHR);
377 return to;
378}
379
380__le32
381smb2_get_lease_state(struct cifsInodeInfo *cinode)
382{
383 __le32 lease = 0;
384
385 if (CIFS_CACHE_WRITE(cinode))
386 lease |= SMB2_LEASE_WRITE_CACHING;
387 if (CIFS_CACHE_HANDLE(cinode))
388 lease |= SMB2_LEASE_HANDLE_CACHING;
389 if (CIFS_CACHE_READ(cinode))
390 lease |= SMB2_LEASE_READ_CACHING;
391 return lease;
392}
393
394struct smb2_lease_break_work {
395 struct work_struct lease_break;
396 struct tcon_link *tlink;
397 __u8 lease_key[16];
398 __le32 lease_state;
399};
400
401static void
402cifs_ses_oplock_break(struct work_struct *work)
403{
404 struct smb2_lease_break_work *lw = container_of(work,
405 struct smb2_lease_break_work, lease_break);
406 int rc;
407
408 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
409 lw->lease_state);
410 cifs_dbg(FYI, "Lease release rc %d\n", rc);
411 cifs_put_tlink(lw->tlink);
412 kfree(lw);
413}
414
415static bool
416smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
417 struct smb2_lease_break_work *lw)
418{
419 bool found;
420 __u8 lease_state;
421 struct list_head *tmp;
422 struct cifsFileInfo *cfile;
423 struct TCP_Server_Info *server = tcon->ses->server;
424 struct cifs_pending_open *open;
425 struct cifsInodeInfo *cinode;
426 int ack_req = le32_to_cpu(rsp->Flags &
427 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
428
429 lease_state = le32_to_cpu(rsp->NewLeaseState);
430
431 list_for_each(tmp, &tcon->openFileList) {
432 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
433 cinode = CIFS_I(cfile->dentry->d_inode);
434
435 if (memcmp(cinode->lease_key, rsp->LeaseKey,
436 SMB2_LEASE_KEY_SIZE))
437 continue;
438
439 cifs_dbg(FYI, "found in the open list\n");
440 cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
441 le32_to_cpu(rsp->NewLeaseState));
442
443 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
444
445 if (ack_req)
446 cfile->oplock_break_cancelled = false;
447 else
448 cfile->oplock_break_cancelled = true;
449
450 queue_work(cifsiod_wq, &cfile->oplock_break);
451 kfree(lw);
452 return true;
453 }
454
455 found = false;
456 list_for_each_entry(open, &tcon->pending_opens, olist) {
457 if (memcmp(open->lease_key, rsp->LeaseKey,
458 SMB2_LEASE_KEY_SIZE))
459 continue;
460
461 if (!found && ack_req) {
462 found = true;
463 memcpy(lw->lease_key, open->lease_key,
464 SMB2_LEASE_KEY_SIZE);
465 lw->tlink = cifs_get_tlink(open->tlink);
466 queue_work(cifsiod_wq, &lw->lease_break);
467 }
468
469 cifs_dbg(FYI, "found in the pending open list\n");
470 cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
471 le32_to_cpu(rsp->NewLeaseState));
472
473 open->oplock = lease_state;
474 }
475 return found;
476}
477
478static bool
479smb2_is_valid_lease_break(char *buffer)
480{
481 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
482 struct list_head *tmp, *tmp1, *tmp2;
483 struct TCP_Server_Info *server;
484 struct cifs_ses *ses;
485 struct cifs_tcon *tcon;
486 struct smb2_lease_break_work *lw;
487
488 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
489 if (!lw)
490 return false;
491
492 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
493 lw->lease_state = rsp->NewLeaseState;
494
495 cifs_dbg(FYI, "Checking for lease break\n");
496
497 /* look up tcon based on tid & uid */
498 spin_lock(&cifs_tcp_ses_lock);
499 list_for_each(tmp, &cifs_tcp_ses_list) {
500 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
501
502 list_for_each(tmp1, &server->smb_ses_list) {
503 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
504
505 spin_lock(&cifs_file_list_lock);
506 list_for_each(tmp2, &ses->tcon_list) {
507 tcon = list_entry(tmp2, struct cifs_tcon,
508 tcon_list);
509 cifs_stats_inc(
510 &tcon->stats.cifs_stats.num_oplock_brks);
511 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
512 spin_unlock(&cifs_file_list_lock);
513 spin_unlock(&cifs_tcp_ses_lock);
514 return true;
515 }
516 }
517 spin_unlock(&cifs_file_list_lock);
518 }
519 }
520 spin_unlock(&cifs_tcp_ses_lock);
521 kfree(lw);
522 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
523 return false;
524}
525
526bool
527smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
528{
529 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
530 struct list_head *tmp, *tmp1, *tmp2;
531 struct cifs_ses *ses;
532 struct cifs_tcon *tcon;
533 struct cifsInodeInfo *cinode;
534 struct cifsFileInfo *cfile;
535
536 cifs_dbg(FYI, "Checking for oplock break\n");
537
538 if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
539 return false;
540
541 if (rsp->StructureSize !=
542 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
543 if (le16_to_cpu(rsp->StructureSize) == 44)
544 return smb2_is_valid_lease_break(buffer);
545 else
546 return false;
547 }
548
549 cifs_dbg(FYI, "oplock level 0x%d\n", rsp->OplockLevel);
550
551 /* look up tcon based on tid & uid */
552 spin_lock(&cifs_tcp_ses_lock);
553 list_for_each(tmp, &server->smb_ses_list) {
554 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
555 list_for_each(tmp1, &ses->tcon_list) {
556 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
557
558 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
559 spin_lock(&cifs_file_list_lock);
560 list_for_each(tmp2, &tcon->openFileList) {
561 cfile = list_entry(tmp2, struct cifsFileInfo,
562 tlist);
563 if (rsp->PersistentFid !=
564 cfile->fid.persistent_fid ||
565 rsp->VolatileFid !=
566 cfile->fid.volatile_fid)
567 continue;
568
569 cifs_dbg(FYI, "file id match, oplock break\n");
570 cinode = CIFS_I(cfile->dentry->d_inode);
571
572 if (!CIFS_CACHE_WRITE(cinode) &&
573 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
574 cfile->oplock_break_cancelled = true;
575 else
576 cfile->oplock_break_cancelled = false;
577
578 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
579 &cinode->flags);
580
581 /*
582 * Set flag if the server downgrades the oplock
583 * to L2 else clear.
584 */
585 if (rsp->OplockLevel)
586 set_bit(
587 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
588 &cinode->flags);
589 else
590 clear_bit(
591 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
592 &cinode->flags);
593
594 queue_work(cifsiod_wq, &cfile->oplock_break);
595
596 spin_unlock(&cifs_file_list_lock);
597 spin_unlock(&cifs_tcp_ses_lock);
598 return true;
599 }
600 spin_unlock(&cifs_file_list_lock);
601 spin_unlock(&cifs_tcp_ses_lock);
602 cifs_dbg(FYI, "No matching file for oplock break\n");
603 return true;
604 }
605 }
606 spin_unlock(&cifs_tcp_ses_lock);
607 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
608 return false;
609}