Commit | Line | Data |
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093b2bda PS |
1 | /* |
2 | * fs/cifs/smb2misc.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2002,2011 | |
5 | * Etersoft, 2012 | |
6 | * Author(s): Steve French (sfrench@us.ibm.com) | |
7 | * Pavel Shilovsky (pshilovsky@samba.org) 2012 | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU Lesser General Public License as published | |
11 | * by the Free Software Foundation; either version 2.1 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
17 | * the GNU Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public License | |
20 | * along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | #include <linux/ctype.h> | |
24 | #include "smb2pdu.h" | |
25 | #include "cifsglob.h" | |
26 | #include "cifsproto.h" | |
27 | #include "smb2proto.h" | |
28 | #include "cifs_debug.h" | |
29 | #include "cifs_unicode.h" | |
30 | #include "smb2status.h" | |
31 | ||
32 | static int | |
33 | check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid) | |
34 | { | |
9235d098 SP |
35 | __u64 wire_mid = le64_to_cpu(hdr->MessageId); |
36 | ||
093b2bda PS |
37 | /* |
38 | * Make sure that this really is an SMB, that it is a response, | |
39 | * and that the message ids match. | |
40 | */ | |
41 | if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) && | |
9235d098 | 42 | (mid == wire_mid)) { |
093b2bda PS |
43 | if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) |
44 | return 0; | |
45 | else { | |
46 | /* only one valid case where server sends us request */ | |
47 | if (hdr->Command == SMB2_OPLOCK_BREAK) | |
48 | return 0; | |
49 | else | |
f96637be | 50 | cifs_dbg(VFS, "Received Request not response\n"); |
093b2bda PS |
51 | } |
52 | } else { /* bad signature or mid */ | |
53 | if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER) | |
f96637be JP |
54 | cifs_dbg(VFS, "Bad protocol string signature header %x\n", |
55 | *(unsigned int *) hdr->ProtocolId); | |
9235d098 | 56 | if (mid != wire_mid) |
f96637be | 57 | cifs_dbg(VFS, "Mids do not match: %llu and %llu\n", |
9235d098 | 58 | mid, wire_mid); |
093b2bda | 59 | } |
9235d098 | 60 | cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid); |
093b2bda PS |
61 | return 1; |
62 | } | |
63 | ||
64 | /* | |
65 | * The following table defines the expected "StructureSize" of SMB2 responses | |
66 | * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses. | |
67 | * | |
68 | * Note that commands are defined in smb2pdu.h in le16 but the array below is | |
69 | * indexed by command in host byte order | |
70 | */ | |
71 | static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { | |
bc09d141 FF |
72 | /* SMB2_NEGOTIATE */ cpu_to_le16(65), |
73 | /* SMB2_SESSION_SETUP */ cpu_to_le16(9), | |
74 | /* SMB2_LOGOFF */ cpu_to_le16(4), | |
75 | /* SMB2_TREE_CONNECT */ cpu_to_le16(16), | |
76 | /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4), | |
77 | /* SMB2_CREATE */ cpu_to_le16(89), | |
78 | /* SMB2_CLOSE */ cpu_to_le16(60), | |
79 | /* SMB2_FLUSH */ cpu_to_le16(4), | |
80 | /* SMB2_READ */ cpu_to_le16(17), | |
81 | /* SMB2_WRITE */ cpu_to_le16(17), | |
82 | /* SMB2_LOCK */ cpu_to_le16(4), | |
83 | /* SMB2_IOCTL */ cpu_to_le16(49), | |
093b2bda | 84 | /* BB CHECK this ... not listed in documentation */ |
bc09d141 FF |
85 | /* SMB2_CANCEL */ cpu_to_le16(0), |
86 | /* SMB2_ECHO */ cpu_to_le16(4), | |
87 | /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9), | |
88 | /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9), | |
89 | /* SMB2_QUERY_INFO */ cpu_to_le16(9), | |
90 | /* SMB2_SET_INFO */ cpu_to_le16(2), | |
093b2bda | 91 | /* BB FIXME can also be 44 for lease break */ |
bc09d141 | 92 | /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24) |
093b2bda PS |
93 | }; |
94 | ||
95 | int | |
96 | smb2_check_message(char *buf, unsigned int length) | |
97 | { | |
98 | struct smb2_hdr *hdr = (struct smb2_hdr *)buf; | |
99 | struct smb2_pdu *pdu = (struct smb2_pdu *)hdr; | |
9235d098 | 100 | __u64 mid = le64_to_cpu(hdr->MessageId); |
093b2bda PS |
101 | __u32 len = get_rfc1002_length(buf); |
102 | __u32 clc_len; /* calculated length */ | |
103 | int command; | |
104 | ||
105 | /* BB disable following printk later */ | |
f96637be JP |
106 | cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n", |
107 | __func__, length, len); | |
093b2bda PS |
108 | |
109 | /* | |
110 | * Add function to do table lookup of StructureSize by command | |
111 | * ie Validate the wct via smb2_struct_sizes table above | |
112 | */ | |
113 | ||
74112860 | 114 | if (length < sizeof(struct smb2_pdu)) { |
093b2bda PS |
115 | if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) { |
116 | pdu->StructureSize2 = 0; | |
117 | /* | |
118 | * As with SMB/CIFS, on some error cases servers may | |
119 | * not return wct properly | |
120 | */ | |
121 | return 0; | |
122 | } else { | |
f96637be | 123 | cifs_dbg(VFS, "Length less than SMB header size\n"); |
093b2bda PS |
124 | } |
125 | return 1; | |
126 | } | |
127 | if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) { | |
f96637be JP |
128 | cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", |
129 | mid); | |
093b2bda PS |
130 | return 1; |
131 | } | |
132 | ||
133 | if (check_smb2_hdr(hdr, mid)) | |
134 | return 1; | |
135 | ||
74112860 | 136 | if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { |
f96637be JP |
137 | cifs_dbg(VFS, "Illegal structure size %u\n", |
138 | le16_to_cpu(hdr->StructureSize)); | |
093b2bda PS |
139 | return 1; |
140 | } | |
141 | ||
142 | command = le16_to_cpu(hdr->Command); | |
143 | if (command >= NUMBER_OF_SMB2_COMMANDS) { | |
f96637be | 144 | cifs_dbg(VFS, "Illegal SMB2 command %d\n", command); |
093b2bda PS |
145 | return 1; |
146 | } | |
147 | ||
148 | if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { | |
983c88a4 PS |
149 | if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 || |
150 | pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) { | |
093b2bda | 151 | /* error packets have 9 byte structure size */ |
f96637be JP |
152 | cifs_dbg(VFS, "Illegal response size %u for command %d\n", |
153 | le16_to_cpu(pdu->StructureSize2), command); | |
093b2bda | 154 | return 1; |
0822f514 PS |
155 | } else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0) |
156 | && (le16_to_cpu(pdu->StructureSize2) != 44) | |
157 | && (le16_to_cpu(pdu->StructureSize2) != 36)) { | |
158 | /* special case for SMB2.1 lease break message */ | |
f96637be JP |
159 | cifs_dbg(VFS, "Illegal response size %d for oplock break\n", |
160 | le16_to_cpu(pdu->StructureSize2)); | |
0822f514 | 161 | return 1; |
093b2bda PS |
162 | } |
163 | } | |
164 | ||
165 | if (4 + len != length) { | |
f96637be JP |
166 | cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n", |
167 | length, 4 + len, mid); | |
093b2bda PS |
168 | return 1; |
169 | } | |
170 | ||
171 | clc_len = smb2_calc_size(hdr); | |
172 | ||
173 | if (4 + len != clc_len) { | |
f96637be JP |
174 | cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", |
175 | clc_len, 4 + len, mid); | |
b42bf888 PS |
176 | /* create failed on symlink */ |
177 | if (command == SMB2_CREATE_HE && | |
178 | hdr->Status == STATUS_STOPPED_ON_SYMLINK) | |
179 | return 0; | |
983c88a4 PS |
180 | /* Windows 7 server returns 24 bytes more */ |
181 | if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE) | |
182 | return 0; | |
754789a1 | 183 | /* server can return one byte more due to implied bcc[0] */ |
74112860 PS |
184 | if (clc_len == 4 + len + 1) |
185 | return 0; | |
754789a1 SF |
186 | |
187 | /* | |
188 | * MacOS server pads after SMB2.1 write response with 3 bytes | |
189 | * of junk. Other servers match RFC1001 len to actual | |
190 | * SMB2/SMB3 frame length (header + smb2 response specific data) | |
191 | * Log the server error (once), but allow it and continue | |
192 | * since the frame is parseable. | |
193 | */ | |
194 | if (clc_len < 4 /* RFC1001 header size */ + len) { | |
195 | printk_once(KERN_WARNING | |
196 | "SMB2 server sent bad RFC1001 len %d not %d\n", | |
197 | len, clc_len - 4); | |
198 | return 0; | |
199 | } | |
200 | ||
093b2bda PS |
201 | return 1; |
202 | } | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* | |
207 | * The size of the variable area depends on the offset and length fields | |
208 | * located in different fields for various SMB2 responses. SMB2 responses | |
209 | * with no variable length info, show an offset of zero for the offset field. | |
210 | */ | |
211 | static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { | |
212 | /* SMB2_NEGOTIATE */ true, | |
213 | /* SMB2_SESSION_SETUP */ true, | |
214 | /* SMB2_LOGOFF */ false, | |
215 | /* SMB2_TREE_CONNECT */ false, | |
216 | /* SMB2_TREE_DISCONNECT */ false, | |
217 | /* SMB2_CREATE */ true, | |
218 | /* SMB2_CLOSE */ false, | |
219 | /* SMB2_FLUSH */ false, | |
220 | /* SMB2_READ */ true, | |
221 | /* SMB2_WRITE */ false, | |
222 | /* SMB2_LOCK */ false, | |
223 | /* SMB2_IOCTL */ true, | |
224 | /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ | |
225 | /* SMB2_ECHO */ false, | |
226 | /* SMB2_QUERY_DIRECTORY */ true, | |
227 | /* SMB2_CHANGE_NOTIFY */ true, | |
228 | /* SMB2_QUERY_INFO */ true, | |
229 | /* SMB2_SET_INFO */ false, | |
230 | /* SMB2_OPLOCK_BREAK */ false | |
231 | }; | |
232 | ||
233 | /* | |
234 | * Returns the pointer to the beginning of the data area. Length of the data | |
235 | * area and the offset to it (from the beginning of the smb are also returned. | |
236 | */ | |
ec2e4523 | 237 | char * |
093b2bda PS |
238 | smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr) |
239 | { | |
240 | *off = 0; | |
241 | *len = 0; | |
242 | ||
243 | /* error responses do not have data area */ | |
244 | if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED && | |
245 | (((struct smb2_err_rsp *)hdr)->StructureSize) == | |
246 | SMB2_ERROR_STRUCTURE_SIZE2) | |
247 | return NULL; | |
248 | ||
249 | /* | |
250 | * Following commands have data areas so we have to get the location | |
251 | * of the data buffer offset and data buffer length for the particular | |
252 | * command. | |
253 | */ | |
254 | switch (hdr->Command) { | |
255 | case SMB2_NEGOTIATE: | |
ec2e4523 PS |
256 | *off = le16_to_cpu( |
257 | ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset); | |
258 | *len = le16_to_cpu( | |
259 | ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength); | |
260 | break; | |
093b2bda | 261 | case SMB2_SESSION_SETUP: |
5478f9ba PS |
262 | *off = le16_to_cpu( |
263 | ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset); | |
264 | *len = le16_to_cpu( | |
265 | ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength); | |
266 | break; | |
093b2bda | 267 | case SMB2_CREATE: |
2503a0db PS |
268 | *off = le32_to_cpu( |
269 | ((struct smb2_create_rsp *)hdr)->CreateContextsOffset); | |
270 | *len = le32_to_cpu( | |
271 | ((struct smb2_create_rsp *)hdr)->CreateContextsLength); | |
272 | break; | |
093b2bda | 273 | case SMB2_QUERY_INFO: |
be4cb9e3 PS |
274 | *off = le16_to_cpu( |
275 | ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset); | |
276 | *len = le32_to_cpu( | |
277 | ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength); | |
278 | break; | |
279 | case SMB2_READ: | |
09a4707e PS |
280 | *off = ((struct smb2_read_rsp *)hdr)->DataOffset; |
281 | *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength); | |
282 | break; | |
093b2bda | 283 | case SMB2_QUERY_DIRECTORY: |
d324f08d PS |
284 | *off = le16_to_cpu( |
285 | ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset); | |
286 | *len = le32_to_cpu( | |
287 | ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength); | |
288 | break; | |
093b2bda | 289 | case SMB2_IOCTL: |
4a72dafa SF |
290 | *off = le32_to_cpu( |
291 | ((struct smb2_ioctl_rsp *)hdr)->OutputOffset); | |
292 | *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount); | |
293 | break; | |
093b2bda PS |
294 | case SMB2_CHANGE_NOTIFY: |
295 | default: | |
296 | /* BB FIXME for unimplemented cases above */ | |
f96637be | 297 | cifs_dbg(VFS, "no length check for command\n"); |
093b2bda PS |
298 | break; |
299 | } | |
300 | ||
301 | /* | |
302 | * Invalid length or offset probably means data area is invalid, but | |
303 | * we have little choice but to ignore the data area in this case. | |
304 | */ | |
305 | if (*off > 4096) { | |
f96637be | 306 | cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); |
093b2bda PS |
307 | *len = 0; |
308 | *off = 0; | |
309 | } else if (*off < 0) { | |
f96637be JP |
310 | cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", |
311 | *off); | |
093b2bda PS |
312 | *off = 0; |
313 | *len = 0; | |
314 | } else if (*len < 0) { | |
f96637be JP |
315 | cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", |
316 | *len); | |
093b2bda PS |
317 | *len = 0; |
318 | } else if (*len > 128 * 1024) { | |
f96637be | 319 | cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); |
093b2bda PS |
320 | *len = 0; |
321 | } | |
322 | ||
323 | /* return pointer to beginning of data area, ie offset from SMB start */ | |
324 | if ((*off != 0) && (*len != 0)) | |
064bcc07 | 325 | return (char *)(&hdr->ProtocolId[0]) + *off; |
093b2bda PS |
326 | else |
327 | return NULL; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Calculate the size of the SMB message based on the fixed header | |
332 | * portion, the number of word parameters and the data portion of the message. | |
333 | */ | |
334 | unsigned int | |
d324f08d | 335 | smb2_calc_size(void *buf) |
093b2bda | 336 | { |
d324f08d | 337 | struct smb2_hdr *hdr = (struct smb2_hdr *)buf; |
093b2bda PS |
338 | struct smb2_pdu *pdu = (struct smb2_pdu *)hdr; |
339 | int offset; /* the offset from the beginning of SMB to data area */ | |
340 | int data_length; /* the length of the variable length data area */ | |
341 | /* Structure Size has already been checked to make sure it is 64 */ | |
342 | int len = 4 + le16_to_cpu(pdu->hdr.StructureSize); | |
343 | ||
344 | /* | |
345 | * StructureSize2, ie length of fixed parameter area has already | |
346 | * been checked to make sure it is the correct length. | |
347 | */ | |
348 | len += le16_to_cpu(pdu->StructureSize2); | |
349 | ||
350 | if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false) | |
351 | goto calc_size_exit; | |
352 | ||
353 | smb2_get_data_area_len(&offset, &data_length, hdr); | |
f96637be | 354 | cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); |
093b2bda PS |
355 | |
356 | if (data_length > 0) { | |
357 | /* | |
358 | * Check to make sure that data area begins after fixed area, | |
359 | * Note that last byte of the fixed area is part of data area | |
360 | * for some commands, typically those with odd StructureSize, | |
361 | * so we must add one to the calculation (and 4 to account for | |
362 | * the size of the RFC1001 hdr. | |
363 | */ | |
364 | if (offset + 4 + 1 < len) { | |
f96637be JP |
365 | cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", |
366 | offset + 4 + 1, len); | |
093b2bda PS |
367 | data_length = 0; |
368 | } else { | |
369 | len = 4 + offset + data_length; | |
370 | } | |
371 | } | |
372 | calc_size_exit: | |
f96637be | 373 | cifs_dbg(FYI, "SMB2 len %d\n", len); |
093b2bda PS |
374 | return len; |
375 | } | |
2503a0db PS |
376 | |
377 | /* Note: caller must free return buffer */ | |
378 | __le16 * | |
379 | cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) | |
380 | { | |
381 | int len; | |
382 | const char *start_of_path; | |
383 | __le16 *to; | |
a4153cb1 SF |
384 | int map_type; |
385 | ||
386 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) | |
387 | map_type = SFM_MAP_UNI_RSVD; | |
388 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
389 | map_type = SFU_MAP_UNI_RSVD; | |
390 | else | |
391 | map_type = NO_MAP_UNI_RSVD; | |
2503a0db PS |
392 | |
393 | /* Windows doesn't allow paths beginning with \ */ | |
394 | if (from[0] == '\\') | |
395 | start_of_path = from + 1; | |
396 | else | |
397 | start_of_path = from; | |
398 | to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len, | |
a4153cb1 | 399 | cifs_sb->local_nls, map_type); |
2503a0db PS |
400 | return to; |
401 | } | |
983c88a4 | 402 | |
0822f514 PS |
403 | __le32 |
404 | smb2_get_lease_state(struct cifsInodeInfo *cinode) | |
405 | { | |
53ef1016 | 406 | __le32 lease = 0; |
0822f514 | 407 | |
53ef1016 PS |
408 | if (CIFS_CACHE_WRITE(cinode)) |
409 | lease |= SMB2_LEASE_WRITE_CACHING; | |
410 | if (CIFS_CACHE_HANDLE(cinode)) | |
411 | lease |= SMB2_LEASE_HANDLE_CACHING; | |
412 | if (CIFS_CACHE_READ(cinode)) | |
413 | lease |= SMB2_LEASE_READ_CACHING; | |
414 | return lease; | |
0822f514 PS |
415 | } |
416 | ||
233839b1 PS |
417 | struct smb2_lease_break_work { |
418 | struct work_struct lease_break; | |
419 | struct tcon_link *tlink; | |
420 | __u8 lease_key[16]; | |
421 | __le32 lease_state; | |
422 | }; | |
423 | ||
424 | static void | |
425 | cifs_ses_oplock_break(struct work_struct *work) | |
426 | { | |
427 | struct smb2_lease_break_work *lw = container_of(work, | |
428 | struct smb2_lease_break_work, lease_break); | |
429 | int rc; | |
430 | ||
431 | rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, | |
432 | lw->lease_state); | |
f96637be | 433 | cifs_dbg(FYI, "Lease release rc %d\n", rc); |
233839b1 PS |
434 | cifs_put_tlink(lw->tlink); |
435 | kfree(lw); | |
436 | } | |
437 | ||
0822f514 | 438 | static bool |
933d4b36 PS |
439 | smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp, |
440 | struct smb2_lease_break_work *lw) | |
441 | { | |
442 | bool found; | |
443 | __u8 lease_state; | |
444 | struct list_head *tmp; | |
445 | struct cifsFileInfo *cfile; | |
42873b0a | 446 | struct TCP_Server_Info *server = tcon->ses->server; |
933d4b36 PS |
447 | struct cifs_pending_open *open; |
448 | struct cifsInodeInfo *cinode; | |
449 | int ack_req = le32_to_cpu(rsp->Flags & | |
450 | SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); | |
451 | ||
53ef1016 | 452 | lease_state = le32_to_cpu(rsp->NewLeaseState); |
933d4b36 PS |
453 | |
454 | list_for_each(tmp, &tcon->openFileList) { | |
455 | cfile = list_entry(tmp, struct cifsFileInfo, tlist); | |
2b0143b5 | 456 | cinode = CIFS_I(d_inode(cfile->dentry)); |
933d4b36 PS |
457 | |
458 | if (memcmp(cinode->lease_key, rsp->LeaseKey, | |
459 | SMB2_LEASE_KEY_SIZE)) | |
460 | continue; | |
461 | ||
462 | cifs_dbg(FYI, "found in the open list\n"); | |
59b04c5d | 463 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
464 | le32_to_cpu(rsp->NewLeaseState)); |
465 | ||
42873b0a | 466 | server->ops->set_oplock_level(cinode, lease_state, 0, NULL); |
933d4b36 PS |
467 | |
468 | if (ack_req) | |
469 | cfile->oplock_break_cancelled = false; | |
470 | else | |
471 | cfile->oplock_break_cancelled = true; | |
472 | ||
473 | queue_work(cifsiod_wq, &cfile->oplock_break); | |
474 | kfree(lw); | |
475 | return true; | |
476 | } | |
477 | ||
478 | found = false; | |
479 | list_for_each_entry(open, &tcon->pending_opens, olist) { | |
480 | if (memcmp(open->lease_key, rsp->LeaseKey, | |
481 | SMB2_LEASE_KEY_SIZE)) | |
482 | continue; | |
483 | ||
484 | if (!found && ack_req) { | |
485 | found = true; | |
486 | memcpy(lw->lease_key, open->lease_key, | |
487 | SMB2_LEASE_KEY_SIZE); | |
488 | lw->tlink = cifs_get_tlink(open->tlink); | |
489 | queue_work(cifsiod_wq, &lw->lease_break); | |
490 | } | |
491 | ||
492 | cifs_dbg(FYI, "found in the pending open list\n"); | |
59b04c5d | 493 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
494 | le32_to_cpu(rsp->NewLeaseState)); |
495 | ||
496 | open->oplock = lease_state; | |
497 | } | |
498 | return found; | |
499 | } | |
500 | ||
501 | static bool | |
502 | smb2_is_valid_lease_break(char *buffer) | |
0822f514 PS |
503 | { |
504 | struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; | |
505 | struct list_head *tmp, *tmp1, *tmp2; | |
933d4b36 | 506 | struct TCP_Server_Info *server; |
0822f514 PS |
507 | struct cifs_ses *ses; |
508 | struct cifs_tcon *tcon; | |
233839b1 | 509 | struct smb2_lease_break_work *lw; |
233839b1 PS |
510 | |
511 | lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); | |
f96637be | 512 | if (!lw) |
233839b1 | 513 | return false; |
233839b1 PS |
514 | |
515 | INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); | |
516 | lw->lease_state = rsp->NewLeaseState; | |
0822f514 | 517 | |
f96637be | 518 | cifs_dbg(FYI, "Checking for lease break\n"); |
0822f514 PS |
519 | |
520 | /* look up tcon based on tid & uid */ | |
521 | spin_lock(&cifs_tcp_ses_lock); | |
933d4b36 PS |
522 | list_for_each(tmp, &cifs_tcp_ses_list) { |
523 | server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list); | |
0822f514 | 524 | |
933d4b36 PS |
525 | list_for_each(tmp1, &server->smb_ses_list) { |
526 | ses = list_entry(tmp1, struct cifs_ses, smb_ses_list); | |
0822f514 | 527 | |
933d4b36 PS |
528 | spin_lock(&cifs_file_list_lock); |
529 | list_for_each(tmp2, &ses->tcon_list) { | |
530 | tcon = list_entry(tmp2, struct cifs_tcon, | |
531 | tcon_list); | |
532 | cifs_stats_inc( | |
533 | &tcon->stats.cifs_stats.num_oplock_brks); | |
534 | if (smb2_tcon_has_lease(tcon, rsp, lw)) { | |
535 | spin_unlock(&cifs_file_list_lock); | |
536 | spin_unlock(&cifs_tcp_ses_lock); | |
537 | return true; | |
233839b1 | 538 | } |
233839b1 | 539 | } |
933d4b36 | 540 | spin_unlock(&cifs_file_list_lock); |
0822f514 PS |
541 | } |
542 | } | |
543 | spin_unlock(&cifs_tcp_ses_lock); | |
233839b1 | 544 | kfree(lw); |
f96637be | 545 | cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); |
0822f514 PS |
546 | return false; |
547 | } | |
548 | ||
983c88a4 PS |
549 | bool |
550 | smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) | |
551 | { | |
552 | struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; | |
553 | struct list_head *tmp, *tmp1, *tmp2; | |
554 | struct cifs_ses *ses; | |
555 | struct cifs_tcon *tcon; | |
556 | struct cifsInodeInfo *cinode; | |
557 | struct cifsFileInfo *cfile; | |
558 | ||
f96637be | 559 | cifs_dbg(FYI, "Checking for oplock break\n"); |
983c88a4 PS |
560 | |
561 | if (rsp->hdr.Command != SMB2_OPLOCK_BREAK) | |
562 | return false; | |
563 | ||
12e8a208 | 564 | if (rsp->StructureSize != |
983c88a4 | 565 | smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { |
0822f514 | 566 | if (le16_to_cpu(rsp->StructureSize) == 44) |
933d4b36 | 567 | return smb2_is_valid_lease_break(buffer); |
0822f514 PS |
568 | else |
569 | return false; | |
983c88a4 PS |
570 | } |
571 | ||
59b04c5d | 572 | cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); |
983c88a4 PS |
573 | |
574 | /* look up tcon based on tid & uid */ | |
575 | spin_lock(&cifs_tcp_ses_lock); | |
576 | list_for_each(tmp, &server->smb_ses_list) { | |
577 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); | |
578 | list_for_each(tmp1, &ses->tcon_list) { | |
579 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); | |
580 | ||
581 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); | |
582 | spin_lock(&cifs_file_list_lock); | |
583 | list_for_each(tmp2, &tcon->openFileList) { | |
584 | cfile = list_entry(tmp2, struct cifsFileInfo, | |
585 | tlist); | |
586 | if (rsp->PersistentFid != | |
587 | cfile->fid.persistent_fid || | |
588 | rsp->VolatileFid != | |
589 | cfile->fid.volatile_fid) | |
590 | continue; | |
591 | ||
f96637be | 592 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 593 | cinode = CIFS_I(d_inode(cfile->dentry)); |
983c88a4 | 594 | |
18cceb6a | 595 | if (!CIFS_CACHE_WRITE(cinode) && |
983c88a4 PS |
596 | rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) |
597 | cfile->oplock_break_cancelled = true; | |
598 | else | |
599 | cfile->oplock_break_cancelled = false; | |
600 | ||
c11f1df5 SP |
601 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
602 | &cinode->flags); | |
603 | ||
604 | /* | |
605 | * Set flag if the server downgrades the oplock | |
606 | * to L2 else clear. | |
607 | */ | |
608 | if (rsp->OplockLevel) | |
609 | set_bit( | |
610 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
611 | &cinode->flags); | |
612 | else | |
613 | clear_bit( | |
614 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
615 | &cinode->flags); | |
983c88a4 PS |
616 | |
617 | queue_work(cifsiod_wq, &cfile->oplock_break); | |
618 | ||
619 | spin_unlock(&cifs_file_list_lock); | |
620 | spin_unlock(&cifs_tcp_ses_lock); | |
621 | return true; | |
622 | } | |
623 | spin_unlock(&cifs_file_list_lock); | |
624 | spin_unlock(&cifs_tcp_ses_lock); | |
f96637be | 625 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
983c88a4 PS |
626 | return true; |
627 | } | |
628 | } | |
629 | spin_unlock(&cifs_tcp_ses_lock); | |
f96637be | 630 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
983c88a4 PS |
631 | return false; |
632 | } |