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Pavel Shilovsky093b2bd2011-06-08 15:51:07 +04001/*
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 cERROR(1, "Received Request not response");
49 }
50 } else { /* bad signature or mid */
51 if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
52 cERROR(1, "Bad protocol string signature header %x",
53 *(unsigned int *) hdr->ProtocolId);
54 if (mid != hdr->MessageId)
Pavel Shilovsky74112862012-07-27 01:20:41 +040055 cERROR(1, "Mids do not match: %llu and %llu", mid,
56 hdr->MessageId);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040057 }
58 cERROR(1, "Bad SMB detected. The Mid=%llu", 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 cFYI(1, "%s length: 0x%x, smb_buf_length: 0x%x", __func__, length, len);
105
106 /*
107 * Add function to do table lookup of StructureSize by command
108 * ie Validate the wct via smb2_struct_sizes table above
109 */
110
Pavel Shilovsky74112862012-07-27 01:20:41 +0400111 if (length < sizeof(struct smb2_pdu)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400112 if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
113 pdu->StructureSize2 = 0;
114 /*
115 * As with SMB/CIFS, on some error cases servers may
116 * not return wct properly
117 */
118 return 0;
119 } else {
120 cERROR(1, "Length less than SMB header size");
121 }
122 return 1;
123 }
124 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
Pavel Shilovsky74112862012-07-27 01:20:41 +0400125 cERROR(1, "SMB length greater than maximum, mid=%llu", mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400126 return 1;
127 }
128
129 if (check_smb2_hdr(hdr, mid))
130 return 1;
131
Pavel Shilovsky74112862012-07-27 01:20:41 +0400132 if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
133 cERROR(1, "Illegal structure size %u",
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400134 le16_to_cpu(hdr->StructureSize));
135 return 1;
136 }
137
138 command = le16_to_cpu(hdr->Command);
139 if (command >= NUMBER_OF_SMB2_COMMANDS) {
140 cERROR(1, "Illegal SMB2 command %d", command);
141 return 1;
142 }
143
144 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700145 if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
146 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400147 /* error packets have 9 byte structure size */
148 cERROR(1, "Illegal response size %u for command %d",
149 le16_to_cpu(pdu->StructureSize2), command);
150 return 1;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700151 } else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0)
152 && (le16_to_cpu(pdu->StructureSize2) != 44)
153 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
154 /* special case for SMB2.1 lease break message */
155 cERROR(1, "Illegal response size %d for oplock break",
156 le16_to_cpu(pdu->StructureSize2));
157 return 1;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400158 }
159 }
160
161 if (4 + len != length) {
162 cERROR(1, "Total length %u RFC1002 length %u mismatch mid %llu",
163 length, 4 + len, mid);
164 return 1;
165 }
166
167 clc_len = smb2_calc_size(hdr);
168
169 if (4 + len != clc_len) {
170 cFYI(1, "Calculated size %u length %u mismatch mid %llu",
171 clc_len, 4 + len, mid);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700172 /* Windows 7 server returns 24 bytes more */
173 if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
174 return 0;
Pavel Shilovsky74112862012-07-27 01:20:41 +0400175 /* server can return one byte more */
176 if (clc_len == 4 + len + 1)
177 return 0;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400178 return 1;
179 }
180 return 0;
181}
182
183/*
184 * The size of the variable area depends on the offset and length fields
185 * located in different fields for various SMB2 responses. SMB2 responses
186 * with no variable length info, show an offset of zero for the offset field.
187 */
188static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
189 /* SMB2_NEGOTIATE */ true,
190 /* SMB2_SESSION_SETUP */ true,
191 /* SMB2_LOGOFF */ false,
192 /* SMB2_TREE_CONNECT */ false,
193 /* SMB2_TREE_DISCONNECT */ false,
194 /* SMB2_CREATE */ true,
195 /* SMB2_CLOSE */ false,
196 /* SMB2_FLUSH */ false,
197 /* SMB2_READ */ true,
198 /* SMB2_WRITE */ false,
199 /* SMB2_LOCK */ false,
200 /* SMB2_IOCTL */ true,
201 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
202 /* SMB2_ECHO */ false,
203 /* SMB2_QUERY_DIRECTORY */ true,
204 /* SMB2_CHANGE_NOTIFY */ true,
205 /* SMB2_QUERY_INFO */ true,
206 /* SMB2_SET_INFO */ false,
207 /* SMB2_OPLOCK_BREAK */ false
208};
209
210/*
211 * Returns the pointer to the beginning of the data area. Length of the data
212 * area and the offset to it (from the beginning of the smb are also returned.
213 */
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400214char *
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400215smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
216{
217 *off = 0;
218 *len = 0;
219
220 /* error responses do not have data area */
221 if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
222 (((struct smb2_err_rsp *)hdr)->StructureSize) ==
223 SMB2_ERROR_STRUCTURE_SIZE2)
224 return NULL;
225
226 /*
227 * Following commands have data areas so we have to get the location
228 * of the data buffer offset and data buffer length for the particular
229 * command.
230 */
231 switch (hdr->Command) {
232 case SMB2_NEGOTIATE:
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400233 *off = le16_to_cpu(
234 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
235 *len = le16_to_cpu(
236 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
237 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400238 case SMB2_SESSION_SETUP:
Pavel Shilovsky5478f9b2011-12-27 16:22:00 +0400239 *off = le16_to_cpu(
240 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
241 *len = le16_to_cpu(
242 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
243 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400244 case SMB2_CREATE:
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400245 *off = le32_to_cpu(
246 ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
247 *len = le32_to_cpu(
248 ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
249 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400250 case SMB2_QUERY_INFO:
Pavel Shilovskybe4cb9e2011-12-29 17:06:33 +0400251 *off = le16_to_cpu(
252 ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
253 *len = le32_to_cpu(
254 ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
255 break;
256 case SMB2_READ:
Pavel Shilovsky09a47072012-09-18 16:20:29 -0700257 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
258 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
259 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400260 case SMB2_QUERY_DIRECTORY:
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700261 *off = le16_to_cpu(
262 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
263 *len = le32_to_cpu(
264 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
265 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400266 case SMB2_IOCTL:
267 case SMB2_CHANGE_NOTIFY:
268 default:
269 /* BB FIXME for unimplemented cases above */
270 cERROR(1, "no length check for command");
271 break;
272 }
273
274 /*
275 * Invalid length or offset probably means data area is invalid, but
276 * we have little choice but to ignore the data area in this case.
277 */
278 if (*off > 4096) {
279 cERROR(1, "offset %d too large, data area ignored", *off);
280 *len = 0;
281 *off = 0;
282 } else if (*off < 0) {
283 cERROR(1, "negative offset %d to data invalid ignore data area",
284 *off);
285 *off = 0;
286 *len = 0;
287 } else if (*len < 0) {
288 cERROR(1, "negative data length %d invalid, data area ignored",
289 *len);
290 *len = 0;
291 } else if (*len > 128 * 1024) {
292 cERROR(1, "data area larger than 128K: %d", *len);
293 *len = 0;
294 }
295
296 /* return pointer to beginning of data area, ie offset from SMB start */
297 if ((*off != 0) && (*len != 0))
298 return hdr->ProtocolId + *off;
299 else
300 return NULL;
301}
302
303/*
304 * Calculate the size of the SMB message based on the fixed header
305 * portion, the number of word parameters and the data portion of the message.
306 */
307unsigned int
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700308smb2_calc_size(void *buf)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400309{
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700310 struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400311 struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
312 int offset; /* the offset from the beginning of SMB to data area */
313 int data_length; /* the length of the variable length data area */
314 /* Structure Size has already been checked to make sure it is 64 */
315 int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
316
317 /*
318 * StructureSize2, ie length of fixed parameter area has already
319 * been checked to make sure it is the correct length.
320 */
321 len += le16_to_cpu(pdu->StructureSize2);
322
323 if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
324 goto calc_size_exit;
325
326 smb2_get_data_area_len(&offset, &data_length, hdr);
327 cFYI(1, "SMB2 data length %d offset %d", data_length, offset);
328
329 if (data_length > 0) {
330 /*
331 * Check to make sure that data area begins after fixed area,
332 * Note that last byte of the fixed area is part of data area
333 * for some commands, typically those with odd StructureSize,
334 * so we must add one to the calculation (and 4 to account for
335 * the size of the RFC1001 hdr.
336 */
337 if (offset + 4 + 1 < len) {
338 cERROR(1, "data area offset %d overlaps SMB2 header %d",
339 offset + 4 + 1, len);
340 data_length = 0;
341 } else {
342 len = 4 + offset + data_length;
343 }
344 }
345calc_size_exit:
346 cFYI(1, "SMB2 len %d", len);
347 return len;
348}
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400349
350/* Note: caller must free return buffer */
351__le16 *
352cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
353{
354 int len;
355 const char *start_of_path;
356 __le16 *to;
357
358 /* Windows doesn't allow paths beginning with \ */
359 if (from[0] == '\\')
360 start_of_path = from + 1;
361 else
362 start_of_path = from;
363 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
364 cifs_sb->local_nls,
365 cifs_sb->mnt_cifs_flags &
366 CIFS_MOUNT_MAP_SPECIAL_CHR);
367 return to;
368}
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700369
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700370__le32
371smb2_get_lease_state(struct cifsInodeInfo *cinode)
372{
373 if (cinode->clientCanCacheAll)
374 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
375 else if (cinode->clientCanCacheRead)
376 return SMB2_LEASE_READ_CACHING;
377 return 0;
378}
379
380__u8 smb2_map_lease_to_oplock(__le32 lease_state)
381{
382 if (lease_state & SMB2_LEASE_WRITE_CACHING) {
383 if (lease_state & SMB2_LEASE_HANDLE_CACHING)
384 return SMB2_OPLOCK_LEVEL_BATCH;
385 else
386 return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
387 } else if (lease_state & SMB2_LEASE_READ_CACHING)
388 return SMB2_OPLOCK_LEVEL_II;
389 return 0;
390}
391
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700392struct smb2_lease_break_work {
393 struct work_struct lease_break;
394 struct tcon_link *tlink;
395 __u8 lease_key[16];
396 __le32 lease_state;
397};
398
399static void
400cifs_ses_oplock_break(struct work_struct *work)
401{
402 struct smb2_lease_break_work *lw = container_of(work,
403 struct smb2_lease_break_work, lease_break);
404 int rc;
405
406 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
407 lw->lease_state);
408 cFYI(1, "Lease release rc %d", rc);
409 cifs_put_tlink(lw->tlink);
410 kfree(lw);
411}
412
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700413static bool
414smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
415{
416 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
417 struct list_head *tmp, *tmp1, *tmp2;
418 struct cifs_ses *ses;
419 struct cifs_tcon *tcon;
420 struct cifsInodeInfo *cinode;
421 struct cifsFileInfo *cfile;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700422 struct cifs_pending_open *open;
423 struct smb2_lease_break_work *lw;
424 bool found;
Steve French12e8a202012-09-19 09:19:39 -0700425 int ack_req = le32_to_cpu(rsp->Flags &
426 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700427
428 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
429 if (!lw) {
430 cERROR(1, "Memory allocation failed during lease break check");
431 return false;
432 }
433
434 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
435 lw->lease_state = rsp->NewLeaseState;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700436
437 cFYI(1, "Checking for lease break");
438
439 /* look up tcon based on tid & uid */
440 spin_lock(&cifs_tcp_ses_lock);
441 list_for_each(tmp, &server->smb_ses_list) {
442 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700443
444 spin_lock(&cifs_file_list_lock);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700445 list_for_each(tmp1, &ses->tcon_list) {
446 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
447
448 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700449 list_for_each(tmp2, &tcon->openFileList) {
450 cfile = list_entry(tmp2, struct cifsFileInfo,
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700451 tlist);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700452 cinode = CIFS_I(cfile->dentry->d_inode);
453
454 if (memcmp(cinode->lease_key, rsp->LeaseKey,
455 SMB2_LEASE_KEY_SIZE))
456 continue;
457
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700458 cFYI(1, "found in the open list");
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700459 cFYI(1, "lease key match, lease break 0x%d",
460 le32_to_cpu(rsp->NewLeaseState));
461
462 smb2_set_oplock_level(cinode,
463 smb2_map_lease_to_oplock(rsp->NewLeaseState));
464
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700465 if (ack_req)
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700466 cfile->oplock_break_cancelled = false;
467 else
468 cfile->oplock_break_cancelled = true;
469
470 queue_work(cifsiod_wq, &cfile->oplock_break);
471
472 spin_unlock(&cifs_file_list_lock);
473 spin_unlock(&cifs_tcp_ses_lock);
474 return true;
475 }
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700476
477 found = false;
478 list_for_each_entry(open, &tcon->pending_opens, olist) {
479 if (memcmp(open->lease_key, rsp->LeaseKey,
480 SMB2_LEASE_KEY_SIZE))
481 continue;
482
483 if (!found && ack_req) {
484 found = true;
485 memcpy(lw->lease_key, open->lease_key,
486 SMB2_LEASE_KEY_SIZE);
487 lw->tlink = cifs_get_tlink(open->tlink);
488 queue_work(cifsiod_wq,
489 &lw->lease_break);
490 }
491
492 cFYI(1, "found in the pending open list");
493 cFYI(1, "lease key match, lease break 0x%d",
494 le32_to_cpu(rsp->NewLeaseState));
495
496 open->oplock =
497 smb2_map_lease_to_oplock(rsp->NewLeaseState);
498 }
499 if (found) {
500 spin_unlock(&cifs_file_list_lock);
501 spin_unlock(&cifs_tcp_ses_lock);
502 return true;
503 }
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700504 }
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700505 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700506 }
507 spin_unlock(&cifs_tcp_ses_lock);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700508 kfree(lw);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700509 cFYI(1, "Can not process lease break - no lease matched");
510 return false;
511}
512
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700513bool
514smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
515{
516 struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
517 struct list_head *tmp, *tmp1, *tmp2;
518 struct cifs_ses *ses;
519 struct cifs_tcon *tcon;
520 struct cifsInodeInfo *cinode;
521 struct cifsFileInfo *cfile;
522
523 cFYI(1, "Checking for oplock break");
524
525 if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
526 return false;
527
Steve French12e8a202012-09-19 09:19:39 -0700528 if (rsp->StructureSize !=
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700529 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700530 if (le16_to_cpu(rsp->StructureSize) == 44)
531 return smb2_is_valid_lease_break(buffer, server);
532 else
533 return false;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700534 }
535
536 cFYI(1, "oplock level 0x%d", rsp->OplockLevel);
537
538 /* look up tcon based on tid & uid */
539 spin_lock(&cifs_tcp_ses_lock);
540 list_for_each(tmp, &server->smb_ses_list) {
541 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
542 list_for_each(tmp1, &ses->tcon_list) {
543 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
544
545 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
546 spin_lock(&cifs_file_list_lock);
547 list_for_each(tmp2, &tcon->openFileList) {
548 cfile = list_entry(tmp2, struct cifsFileInfo,
549 tlist);
550 if (rsp->PersistentFid !=
551 cfile->fid.persistent_fid ||
552 rsp->VolatileFid !=
553 cfile->fid.volatile_fid)
554 continue;
555
556 cFYI(1, "file id match, oplock break");
557 cinode = CIFS_I(cfile->dentry->d_inode);
558
559 if (!cinode->clientCanCacheAll &&
560 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
561 cfile->oplock_break_cancelled = true;
562 else
563 cfile->oplock_break_cancelled = false;
564
565 smb2_set_oplock_level(cinode,
566 rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0);
567
568 queue_work(cifsiod_wq, &cfile->oplock_break);
569
570 spin_unlock(&cifs_file_list_lock);
571 spin_unlock(&cifs_tcp_ses_lock);
572 return true;
573 }
574 spin_unlock(&cifs_file_list_lock);
575 spin_unlock(&cifs_tcp_ses_lock);
576 cFYI(1, "No matching file for oplock break");
577 return true;
578 }
579 }
580 spin_unlock(&cifs_tcp_ses_lock);
581 cFYI(1, "Can not process oplock break for non-existent connection");
582 return false;
583}