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
33 static int
check_smb2_hdr(struct smb2_sync_hdr * shdr,__u64 mid)34 check_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 */
72 static 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
get_neg_ctxt_len(struct smb2_sync_hdr * hdr,__u32 len,__u32 non_ctxlen)96 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
97 __u32 non_ctxlen)
98 {
99 __u16 neg_count;
100 __u32 nc_offset, size_of_pad_before_neg_ctxts;
101 struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
102
103 /* Negotiate contexts are only valid for latest dialect SMB3.11 */
104 neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
105 if ((neg_count == 0) ||
106 (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
107 return 0;
108
109 /* Make sure that negotiate contexts start after gss security blob */
110 nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
111 if (nc_offset < non_ctxlen) {
112 printk_once(KERN_WARNING "invalid negotiate context offset\n");
113 return 0;
114 }
115 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
116
117 /* Verify that at least minimal negotiate contexts fit within frame */
118 if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
119 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
120 return 0;
121 }
122
123 cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
124 len - nc_offset, size_of_pad_before_neg_ctxts);
125
126 /* length of negcontexts including pad from end of sec blob to them */
127 return (len - nc_offset) + size_of_pad_before_neg_ctxts;
128 }
129
130 int
smb2_check_message(char * buf,unsigned int len,struct TCP_Server_Info * srvr)131 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
132 {
133 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
134 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
135 __u64 mid;
136 __u32 clc_len; /* calculated length */
137 int command;
138 int pdu_size = sizeof(struct smb2_sync_pdu);
139 int hdr_size = sizeof(struct smb2_sync_hdr);
140
141 /*
142 * Add function to do table lookup of StructureSize by command
143 * ie Validate the wct via smb2_struct_sizes table above
144 */
145 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
146 struct smb2_transform_hdr *thdr =
147 (struct smb2_transform_hdr *)buf;
148 struct cifs_ses *ses = NULL;
149 struct list_head *tmp;
150
151 /* decrypt frame now that it is completely read in */
152 spin_lock(&cifs_tcp_ses_lock);
153 list_for_each(tmp, &srvr->smb_ses_list) {
154 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
155 if (ses->Suid == thdr->SessionId)
156 break;
157
158 ses = NULL;
159 }
160 spin_unlock(&cifs_tcp_ses_lock);
161 if (ses == NULL) {
162 cifs_dbg(VFS, "no decryption - session id not found\n");
163 return 1;
164 }
165 }
166
167 mid = le64_to_cpu(shdr->MessageId);
168 if (len < pdu_size) {
169 if ((len >= hdr_size)
170 && (shdr->Status != 0)) {
171 pdu->StructureSize2 = 0;
172 /*
173 * As with SMB/CIFS, on some error cases servers may
174 * not return wct properly
175 */
176 return 0;
177 } else {
178 cifs_dbg(VFS, "Length less than SMB header size\n");
179 }
180 return 1;
181 }
182 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
183 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
184 mid);
185 return 1;
186 }
187
188 if (check_smb2_hdr(shdr, mid))
189 return 1;
190
191 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
192 cifs_dbg(VFS, "Illegal structure size %u\n",
193 le16_to_cpu(shdr->StructureSize));
194 return 1;
195 }
196
197 command = le16_to_cpu(shdr->Command);
198 if (command >= NUMBER_OF_SMB2_COMMANDS) {
199 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
200 return 1;
201 }
202
203 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
204 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
205 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
206 /* error packets have 9 byte structure size */
207 cifs_dbg(VFS, "Illegal response size %u for command %d\n",
208 le16_to_cpu(pdu->StructureSize2), command);
209 return 1;
210 } else if (command == SMB2_OPLOCK_BREAK_HE
211 && (shdr->Status == 0)
212 && (le16_to_cpu(pdu->StructureSize2) != 44)
213 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
214 /* special case for SMB2.1 lease break message */
215 cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
216 le16_to_cpu(pdu->StructureSize2));
217 return 1;
218 }
219 }
220
221 clc_len = smb2_calc_size(buf, srvr);
222
223 if (shdr->Command == SMB2_NEGOTIATE)
224 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
225
226 if (len != clc_len) {
227 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
228 clc_len, len, mid);
229 /* create failed on symlink */
230 if (command == SMB2_CREATE_HE &&
231 shdr->Status == STATUS_STOPPED_ON_SYMLINK)
232 return 0;
233 /* Windows 7 server returns 24 bytes more */
234 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
235 return 0;
236 /* server can return one byte more due to implied bcc[0] */
237 if (clc_len == len + 1)
238 return 0;
239
240 /*
241 * Some windows servers (win2016) will pad also the final
242 * PDU in a compound to 8 bytes.
243 */
244 if (((clc_len + 7) & ~7) == len)
245 return 0;
246
247 /*
248 * MacOS server pads after SMB2.1 write response with 3 bytes
249 * of junk. Other servers match RFC1001 len to actual
250 * SMB2/SMB3 frame length (header + smb2 response specific data)
251 * Some windows servers also pad up to 8 bytes when compounding.
252 * If pad is longer than eight bytes, log the server behavior
253 * (once), since may indicate a problem but allow it and continue
254 * since the frame is parseable.
255 */
256 if (clc_len < len) {
257 pr_warn_once(
258 "srv rsp padded more than expected. Length %d not %d for cmd:%d mid:%llu\n",
259 len, clc_len, command, mid);
260 return 0;
261 }
262 pr_warn_once(
263 "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n",
264 len, clc_len, command, mid);
265
266 return 1;
267 }
268 return 0;
269 }
270
271 /*
272 * The size of the variable area depends on the offset and length fields
273 * located in different fields for various SMB2 responses. SMB2 responses
274 * with no variable length info, show an offset of zero for the offset field.
275 */
276 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
277 /* SMB2_NEGOTIATE */ true,
278 /* SMB2_SESSION_SETUP */ true,
279 /* SMB2_LOGOFF */ false,
280 /* SMB2_TREE_CONNECT */ false,
281 /* SMB2_TREE_DISCONNECT */ false,
282 /* SMB2_CREATE */ true,
283 /* SMB2_CLOSE */ false,
284 /* SMB2_FLUSH */ false,
285 /* SMB2_READ */ true,
286 /* SMB2_WRITE */ false,
287 /* SMB2_LOCK */ false,
288 /* SMB2_IOCTL */ true,
289 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
290 /* SMB2_ECHO */ false,
291 /* SMB2_QUERY_DIRECTORY */ true,
292 /* SMB2_CHANGE_NOTIFY */ true,
293 /* SMB2_QUERY_INFO */ true,
294 /* SMB2_SET_INFO */ false,
295 /* SMB2_OPLOCK_BREAK */ false
296 };
297
298 /*
299 * Returns the pointer to the beginning of the data area. Length of the data
300 * area and the offset to it (from the beginning of the smb are also returned.
301 */
302 char *
smb2_get_data_area_len(int * off,int * len,struct smb2_sync_hdr * shdr)303 smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
304 {
305 *off = 0;
306 *len = 0;
307
308 /* error responses do not have data area */
309 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
310 (((struct smb2_err_rsp *)shdr)->StructureSize) ==
311 SMB2_ERROR_STRUCTURE_SIZE2)
312 return NULL;
313
314 /*
315 * Following commands have data areas so we have to get the location
316 * of the data buffer offset and data buffer length for the particular
317 * command.
318 */
319 switch (shdr->Command) {
320 case SMB2_NEGOTIATE:
321 *off = le16_to_cpu(
322 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
323 *len = le16_to_cpu(
324 ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
325 break;
326 case SMB2_SESSION_SETUP:
327 *off = le16_to_cpu(
328 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
329 *len = le16_to_cpu(
330 ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
331 break;
332 case SMB2_CREATE:
333 *off = le32_to_cpu(
334 ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
335 *len = le32_to_cpu(
336 ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
337 break;
338 case SMB2_QUERY_INFO:
339 *off = le16_to_cpu(
340 ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
341 *len = le32_to_cpu(
342 ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
343 break;
344 case SMB2_READ:
345 /* TODO: is this a bug ? */
346 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
347 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
348 break;
349 case SMB2_QUERY_DIRECTORY:
350 *off = le16_to_cpu(
351 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
352 *len = le32_to_cpu(
353 ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
354 break;
355 case SMB2_IOCTL:
356 *off = le32_to_cpu(
357 ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
358 *len = le32_to_cpu(
359 ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
360 break;
361 case SMB2_CHANGE_NOTIFY:
362 default:
363 /* BB FIXME for unimplemented cases above */
364 cifs_dbg(VFS, "no length check for command\n");
365 break;
366 }
367
368 /*
369 * Invalid length or offset probably means data area is invalid, but
370 * we have little choice but to ignore the data area in this case.
371 */
372 if (*off > 4096) {
373 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
374 *len = 0;
375 *off = 0;
376 } else if (*off < 0) {
377 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
378 *off);
379 *off = 0;
380 *len = 0;
381 } else if (*len < 0) {
382 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
383 *len);
384 *len = 0;
385 } else if (*len > 128 * 1024) {
386 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
387 *len = 0;
388 }
389
390 /* return pointer to beginning of data area, ie offset from SMB start */
391 if ((*off != 0) && (*len != 0))
392 return (char *)shdr + *off;
393 else
394 return NULL;
395 }
396
397 /*
398 * Calculate the size of the SMB message based on the fixed header
399 * portion, the number of word parameters and the data portion of the message.
400 */
401 unsigned int
smb2_calc_size(void * buf,struct TCP_Server_Info * srvr)402 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
403 {
404 struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
405 struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
406 int offset; /* the offset from the beginning of SMB to data area */
407 int data_length; /* the length of the variable length data area */
408 /* Structure Size has already been checked to make sure it is 64 */
409 int len = le16_to_cpu(shdr->StructureSize);
410
411 /*
412 * StructureSize2, ie length of fixed parameter area has already
413 * been checked to make sure it is the correct length.
414 */
415 len += le16_to_cpu(pdu->StructureSize2);
416
417 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
418 goto calc_size_exit;
419
420 smb2_get_data_area_len(&offset, &data_length, shdr);
421 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
422
423 if (data_length > 0) {
424 /*
425 * Check to make sure that data area begins after fixed area,
426 * Note that last byte of the fixed area is part of data area
427 * for some commands, typically those with odd StructureSize,
428 * so we must add one to the calculation.
429 */
430 if (offset + 1 < len) {
431 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
432 offset + 1, len);
433 data_length = 0;
434 } else {
435 len = offset + data_length;
436 }
437 }
438 calc_size_exit:
439 cifs_dbg(FYI, "SMB2 len %d\n", len);
440 return len;
441 }
442
443 /* Note: caller must free return buffer */
444 __le16 *
cifs_convert_path_to_utf16(const char * from,struct cifs_sb_info * cifs_sb)445 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
446 {
447 int len;
448 const char *start_of_path;
449 __le16 *to;
450 int map_type;
451
452 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
453 map_type = SFM_MAP_UNI_RSVD;
454 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
455 map_type = SFU_MAP_UNI_RSVD;
456 else
457 map_type = NO_MAP_UNI_RSVD;
458
459 /* Windows doesn't allow paths beginning with \ */
460 if (from[0] == '\\')
461 start_of_path = from + 1;
462
463 /* SMB311 POSIX extensions paths do not include leading slash */
464 else if (cifs_sb_master_tlink(cifs_sb) &&
465 cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
466 (from[0] == '/')) {
467 start_of_path = from + 1;
468 } else
469 start_of_path = from;
470
471 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
472 cifs_sb->local_nls, map_type);
473 return to;
474 }
475
476 __le32
smb2_get_lease_state(struct cifsInodeInfo * cinode)477 smb2_get_lease_state(struct cifsInodeInfo *cinode)
478 {
479 __le32 lease = 0;
480
481 if (CIFS_CACHE_WRITE(cinode))
482 lease |= SMB2_LEASE_WRITE_CACHING;
483 if (CIFS_CACHE_HANDLE(cinode))
484 lease |= SMB2_LEASE_HANDLE_CACHING;
485 if (CIFS_CACHE_READ(cinode))
486 lease |= SMB2_LEASE_READ_CACHING;
487 return lease;
488 }
489
490 struct smb2_lease_break_work {
491 struct work_struct lease_break;
492 struct tcon_link *tlink;
493 __u8 lease_key[16];
494 __le32 lease_state;
495 };
496
497 static void
cifs_ses_oplock_break(struct work_struct * work)498 cifs_ses_oplock_break(struct work_struct *work)
499 {
500 struct smb2_lease_break_work *lw = container_of(work,
501 struct smb2_lease_break_work, lease_break);
502 int rc = 0;
503
504 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
505 lw->lease_state);
506
507 cifs_dbg(FYI, "Lease release rc %d\n", rc);
508 cifs_put_tlink(lw->tlink);
509 kfree(lw);
510 }
511
512 static void
smb2_queue_pending_open_break(struct tcon_link * tlink,__u8 * lease_key,__le32 new_lease_state)513 smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
514 __le32 new_lease_state)
515 {
516 struct smb2_lease_break_work *lw;
517
518 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
519 if (!lw) {
520 cifs_put_tlink(tlink);
521 return;
522 }
523
524 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
525 lw->tlink = tlink;
526 lw->lease_state = new_lease_state;
527 memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
528 queue_work(cifsiod_wq, &lw->lease_break);
529 }
530
531 static bool
smb2_tcon_has_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)532 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
533 {
534 __u8 lease_state;
535 struct list_head *tmp;
536 struct cifsFileInfo *cfile;
537 struct cifsInodeInfo *cinode;
538 int ack_req = le32_to_cpu(rsp->Flags &
539 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
540
541 lease_state = le32_to_cpu(rsp->NewLeaseState);
542
543 list_for_each(tmp, &tcon->openFileList) {
544 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
545 cinode = CIFS_I(d_inode(cfile->dentry));
546
547 if (memcmp(cinode->lease_key, rsp->LeaseKey,
548 SMB2_LEASE_KEY_SIZE))
549 continue;
550
551 cifs_dbg(FYI, "found in the open list\n");
552 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
553 lease_state);
554
555 if (ack_req)
556 cfile->oplock_break_cancelled = false;
557 else
558 cfile->oplock_break_cancelled = true;
559
560 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
561
562 cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
563 cfile->oplock_level = lease_state;
564
565 cifs_queue_oplock_break(cfile);
566 return true;
567 }
568
569 return false;
570 }
571
572 static struct cifs_pending_open *
smb2_tcon_find_pending_open_lease(struct cifs_tcon * tcon,struct smb2_lease_break * rsp)573 smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
574 struct smb2_lease_break *rsp)
575 {
576 __u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
577 int ack_req = le32_to_cpu(rsp->Flags &
578 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
579 struct cifs_pending_open *open;
580 struct cifs_pending_open *found = NULL;
581
582 list_for_each_entry(open, &tcon->pending_opens, olist) {
583 if (memcmp(open->lease_key, rsp->LeaseKey,
584 SMB2_LEASE_KEY_SIZE))
585 continue;
586
587 if (!found && ack_req) {
588 found = open;
589 }
590
591 cifs_dbg(FYI, "found in the pending open list\n");
592 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
593 lease_state);
594
595 open->oplock = lease_state;
596 }
597
598 return found;
599 }
600
601 static bool
smb2_is_valid_lease_break(char * buffer)602 smb2_is_valid_lease_break(char *buffer)
603 {
604 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
605 struct list_head *tmp, *tmp1, *tmp2;
606 struct TCP_Server_Info *server;
607 struct cifs_ses *ses;
608 struct cifs_tcon *tcon;
609 struct cifs_pending_open *open;
610
611 cifs_dbg(FYI, "Checking for lease break\n");
612
613 /* look up tcon based on tid & uid */
614 spin_lock(&cifs_tcp_ses_lock);
615 list_for_each(tmp, &cifs_tcp_ses_list) {
616 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
617
618 list_for_each(tmp1, &server->smb_ses_list) {
619 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
620
621 list_for_each(tmp2, &ses->tcon_list) {
622 tcon = list_entry(tmp2, struct cifs_tcon,
623 tcon_list);
624 spin_lock(&tcon->open_file_lock);
625 cifs_stats_inc(
626 &tcon->stats.cifs_stats.num_oplock_brks);
627 if (smb2_tcon_has_lease(tcon, rsp)) {
628 spin_unlock(&tcon->open_file_lock);
629 spin_unlock(&cifs_tcp_ses_lock);
630 return true;
631 }
632 open = smb2_tcon_find_pending_open_lease(tcon,
633 rsp);
634 if (open) {
635 __u8 lease_key[SMB2_LEASE_KEY_SIZE];
636 struct tcon_link *tlink;
637
638 tlink = cifs_get_tlink(open->tlink);
639 memcpy(lease_key, open->lease_key,
640 SMB2_LEASE_KEY_SIZE);
641 spin_unlock(&tcon->open_file_lock);
642 spin_unlock(&cifs_tcp_ses_lock);
643 smb2_queue_pending_open_break(tlink,
644 lease_key,
645 rsp->NewLeaseState);
646 return true;
647 }
648 spin_unlock(&tcon->open_file_lock);
649
650 if (tcon->crfid.is_valid &&
651 !memcmp(rsp->LeaseKey,
652 tcon->crfid.fid->lease_key,
653 SMB2_LEASE_KEY_SIZE)) {
654 INIT_WORK(&tcon->crfid.lease_break,
655 smb2_cached_lease_break);
656 queue_work(cifsiod_wq,
657 &tcon->crfid.lease_break);
658 spin_unlock(&cifs_tcp_ses_lock);
659 return true;
660 }
661 }
662 }
663 }
664 spin_unlock(&cifs_tcp_ses_lock);
665 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
666 return false;
667 }
668
669 bool
smb2_is_valid_oplock_break(char * buffer,struct TCP_Server_Info * server)670 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
671 {
672 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
673 struct list_head *tmp, *tmp1, *tmp2;
674 struct cifs_ses *ses;
675 struct cifs_tcon *tcon;
676 struct cifsInodeInfo *cinode;
677 struct cifsFileInfo *cfile;
678
679 cifs_dbg(FYI, "Checking for oplock break\n");
680
681 if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
682 return false;
683
684 if (rsp->StructureSize !=
685 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
686 if (le16_to_cpu(rsp->StructureSize) == 44)
687 return smb2_is_valid_lease_break(buffer);
688 else
689 return false;
690 }
691
692 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
693
694 /* look up tcon based on tid & uid */
695 spin_lock(&cifs_tcp_ses_lock);
696 list_for_each(tmp, &server->smb_ses_list) {
697 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
698
699 list_for_each(tmp1, &ses->tcon_list) {
700 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
701
702 spin_lock(&tcon->open_file_lock);
703 list_for_each(tmp2, &tcon->openFileList) {
704 cfile = list_entry(tmp2, struct cifsFileInfo,
705 tlist);
706 if (rsp->PersistentFid !=
707 cfile->fid.persistent_fid ||
708 rsp->VolatileFid !=
709 cfile->fid.volatile_fid)
710 continue;
711
712 cifs_dbg(FYI, "file id match, oplock break\n");
713 cifs_stats_inc(
714 &tcon->stats.cifs_stats.num_oplock_brks);
715 cinode = CIFS_I(d_inode(cfile->dentry));
716 spin_lock(&cfile->file_info_lock);
717 if (!CIFS_CACHE_WRITE(cinode) &&
718 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
719 cfile->oplock_break_cancelled = true;
720 else
721 cfile->oplock_break_cancelled = false;
722
723 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
724 &cinode->flags);
725
726 cfile->oplock_epoch = 0;
727 cfile->oplock_level = rsp->OplockLevel;
728
729 spin_unlock(&cfile->file_info_lock);
730
731 cifs_queue_oplock_break(cfile);
732
733 spin_unlock(&tcon->open_file_lock);
734 spin_unlock(&cifs_tcp_ses_lock);
735 return true;
736 }
737 spin_unlock(&tcon->open_file_lock);
738 }
739 }
740 spin_unlock(&cifs_tcp_ses_lock);
741 cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
742 return true;
743 }
744
745 void
smb2_cancelled_close_fid(struct work_struct * work)746 smb2_cancelled_close_fid(struct work_struct *work)
747 {
748 struct close_cancelled_open *cancelled = container_of(work,
749 struct close_cancelled_open, work);
750
751 cifs_dbg(VFS, "Close unmatched open\n");
752
753 SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
754 cancelled->fid.volatile_fid);
755 cifs_put_tcon(cancelled->tcon);
756 kfree(cancelled);
757 }
758
759 /* Caller should already has an extra reference to @tcon */
760 static int
__smb2_handle_cancelled_close(struct cifs_tcon * tcon,__u64 persistent_fid,__u64 volatile_fid)761 __smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
762 __u64 volatile_fid)
763 {
764 struct close_cancelled_open *cancelled;
765
766 cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
767 if (!cancelled)
768 return -ENOMEM;
769
770 cancelled->fid.persistent_fid = persistent_fid;
771 cancelled->fid.volatile_fid = volatile_fid;
772 cancelled->tcon = tcon;
773 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
774 WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
775
776 return 0;
777 }
778
779 int
smb2_handle_cancelled_close(struct cifs_tcon * tcon,__u64 persistent_fid,__u64 volatile_fid)780 smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
781 __u64 volatile_fid)
782 {
783 int rc;
784
785 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
786 spin_lock(&cifs_tcp_ses_lock);
787 tcon->tc_count++;
788 spin_unlock(&cifs_tcp_ses_lock);
789
790 rc = __smb2_handle_cancelled_close(tcon, persistent_fid, volatile_fid);
791 if (rc)
792 cifs_put_tcon(tcon);
793
794 return rc;
795 }
796
797 int
smb2_handle_cancelled_mid(char * buffer,struct TCP_Server_Info * server)798 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
799 {
800 struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer;
801 struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
802 struct cifs_tcon *tcon;
803 int rc;
804
805 if (sync_hdr->Command != SMB2_CREATE ||
806 sync_hdr->Status != STATUS_SUCCESS)
807 return 0;
808
809 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
810 sync_hdr->TreeId);
811 if (!tcon)
812 return -ENOENT;
813
814 rc = __smb2_handle_cancelled_close(tcon, rsp->PersistentFileId,
815 rsp->VolatileFileId);
816 if (rc)
817 cifs_put_tcon(tcon);
818
819 return rc;
820 }
821
822 /**
823 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
824 *
825 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
826 * SMB2 header.
827 */
828 int
smb311_update_preauth_hash(struct cifs_ses * ses,struct kvec * iov,int nvec)829 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
830 {
831 int i, rc;
832 struct sdesc *d;
833 struct smb2_sync_hdr *hdr;
834
835 if (ses->server->tcpStatus == CifsGood) {
836 /* skip non smb311 connections */
837 if (ses->server->dialect != SMB311_PROT_ID)
838 return 0;
839
840 /* skip last sess setup response */
841 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
842 if (hdr->Flags & SMB2_FLAGS_SIGNED)
843 return 0;
844 }
845
846 rc = smb311_crypto_shash_allocate(ses->server);
847 if (rc)
848 return rc;
849
850 d = ses->server->secmech.sdescsha512;
851 rc = crypto_shash_init(&d->shash);
852 if (rc) {
853 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
854 return rc;
855 }
856
857 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
858 SMB2_PREAUTH_HASH_SIZE);
859 if (rc) {
860 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
861 return rc;
862 }
863
864 for (i = 0; i < nvec; i++) {
865 rc = crypto_shash_update(&d->shash,
866 iov[i].iov_base, iov[i].iov_len);
867 if (rc) {
868 cifs_dbg(VFS, "%s: could not update sha512 shash\n",
869 __func__);
870 return rc;
871 }
872 }
873
874 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
875 if (rc) {
876 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
877 __func__);
878 return rc;
879 }
880
881 return 0;
882 }
883