Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/misc.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * This library is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU Lesser General Public License as published | |
9 | * by the Free Software Foundation; either version 2.1 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | * the GNU Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software | |
fb8c4b14 | 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
20 | */ |
21 | ||
22 | #include <linux/slab.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/mempool.h> | |
25 | #include "cifspdu.h" | |
26 | #include "cifsglob.h" | |
27 | #include "cifsproto.h" | |
28 | #include "cifs_debug.h" | |
29 | #include "smberr.h" | |
30 | #include "nterr.h" | |
6c91d362 | 31 | #include "cifs_unicode.h" |
1da177e4 LT |
32 | |
33 | extern mempool_t *cifs_sm_req_poolp; | |
34 | extern mempool_t *cifs_req_poolp; | |
fb8c4b14 | 35 | extern struct task_struct *oplockThread; |
1da177e4 | 36 | |
fb8c4b14 SF |
37 | /* The xid serves as a useful identifier for each incoming vfs request, |
38 | in a similar way to the mid which is useful to track each sent smb, | |
39 | and CurrentXid can also provide a running counter (although it | |
40 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
41 | since the cifs fs was mounted */ |
42 | ||
43 | unsigned int | |
44 | _GetXid(void) | |
45 | { | |
46 | unsigned int xid; | |
47 | ||
48 | spin_lock(&GlobalMid_Lock); | |
49 | GlobalTotalActiveXid++; | |
50c2f753 SF |
50 | |
51 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 52 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 53 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 54 | if (GlobalTotalActiveXid > 65000) |
fb8c4b14 | 55 | cFYI(1, ("warning: more than 65000 requests active")); |
1da177e4 LT |
56 | xid = GlobalCurrentXid++; |
57 | spin_unlock(&GlobalMid_Lock); | |
58 | return xid; | |
59 | } | |
60 | ||
61 | void | |
62 | _FreeXid(unsigned int xid) | |
63 | { | |
64 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 65 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
66 | BUG(); */ |
67 | GlobalTotalActiveXid--; | |
68 | spin_unlock(&GlobalMid_Lock); | |
69 | } | |
70 | ||
71 | struct cifsSesInfo * | |
72 | sesInfoAlloc(void) | |
73 | { | |
74 | struct cifsSesInfo *ret_buf; | |
75 | ||
630f3f0c | 76 | ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL); |
1da177e4 | 77 | if (ret_buf) { |
1da177e4 LT |
78 | atomic_inc(&sesInfoAllocCount); |
79 | ret_buf->status = CifsNew; | |
14fbf50d JL |
80 | ++ret_buf->ses_count; |
81 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
1da177e4 | 82 | init_MUTEX(&ret_buf->sesSem); |
1da177e4 LT |
83 | } |
84 | return ret_buf; | |
85 | } | |
86 | ||
87 | void | |
88 | sesInfoFree(struct cifsSesInfo *buf_to_free) | |
89 | { | |
90 | if (buf_to_free == NULL) { | |
91 | cFYI(1, ("Null buffer passed to sesInfoFree")); | |
92 | return; | |
93 | } | |
94 | ||
1da177e4 | 95 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
96 | kfree(buf_to_free->serverOS); |
97 | kfree(buf_to_free->serverDomain); | |
98 | kfree(buf_to_free->serverNOS); | |
99 | kfree(buf_to_free->password); | |
3979877e | 100 | kfree(buf_to_free->domainName); |
1da177e4 LT |
101 | kfree(buf_to_free); |
102 | } | |
103 | ||
104 | struct cifsTconInfo * | |
105 | tconInfoAlloc(void) | |
106 | { | |
107 | struct cifsTconInfo *ret_buf; | |
630f3f0c | 108 | ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL); |
1da177e4 | 109 | if (ret_buf) { |
1da177e4 LT |
110 | write_lock(&GlobalSMBSeslock); |
111 | atomic_inc(&tconInfoAllocCount); | |
112 | list_add(&ret_buf->cifsConnectionList, | |
113 | &GlobalTreeConnectionList); | |
114 | ret_buf->tidStatus = CifsNew; | |
115 | INIT_LIST_HEAD(&ret_buf->openFileList); | |
116 | init_MUTEX(&ret_buf->tconSem); | |
117 | #ifdef CONFIG_CIFS_STATS | |
118 | spin_lock_init(&ret_buf->stat_lock); | |
119 | #endif | |
120 | write_unlock(&GlobalSMBSeslock); | |
121 | } | |
122 | return ret_buf; | |
123 | } | |
124 | ||
125 | void | |
126 | tconInfoFree(struct cifsTconInfo *buf_to_free) | |
127 | { | |
128 | if (buf_to_free == NULL) { | |
129 | cFYI(1, ("Null buffer passed to tconInfoFree")); | |
130 | return; | |
131 | } | |
132 | write_lock(&GlobalSMBSeslock); | |
133 | atomic_dec(&tconInfoAllocCount); | |
134 | list_del(&buf_to_free->cifsConnectionList); | |
135 | write_unlock(&GlobalSMBSeslock); | |
f99d49ad | 136 | kfree(buf_to_free->nativeFileSystem); |
1da177e4 LT |
137 | kfree(buf_to_free); |
138 | } | |
139 | ||
140 | struct smb_hdr * | |
141 | cifs_buf_get(void) | |
142 | { | |
143 | struct smb_hdr *ret_buf = NULL; | |
144 | ||
fb8c4b14 SF |
145 | /* We could use negotiated size instead of max_msgsize - |
146 | but it may be more efficient to always alloc same size | |
147 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 148 | defaults to this and can not be bigger */ |
232087cb | 149 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
150 | |
151 | /* clear the first few header bytes */ | |
152 | /* for most paths, more is cleared in header_assemble */ | |
153 | if (ret_buf) { | |
154 | memset(ret_buf, 0, sizeof(struct smb_hdr) + 3); | |
155 | atomic_inc(&bufAllocCount); | |
4498eed5 SF |
156 | #ifdef CONFIG_CIFS_STATS2 |
157 | atomic_inc(&totBufAllocCount); | |
158 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
159 | } |
160 | ||
161 | return ret_buf; | |
162 | } | |
163 | ||
164 | void | |
165 | cifs_buf_release(void *buf_to_free) | |
166 | { | |
1da177e4 LT |
167 | if (buf_to_free == NULL) { |
168 | /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/ | |
169 | return; | |
170 | } | |
fb8c4b14 | 171 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
172 | |
173 | atomic_dec(&bufAllocCount); | |
174 | return; | |
175 | } | |
176 | ||
177 | struct smb_hdr * | |
178 | cifs_small_buf_get(void) | |
179 | { | |
180 | struct smb_hdr *ret_buf = NULL; | |
181 | ||
fb8c4b14 SF |
182 | /* We could use negotiated size instead of max_msgsize - |
183 | but it may be more efficient to always alloc same size | |
184 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 185 | defaults to this and can not be bigger */ |
232087cb | 186 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
187 | if (ret_buf) { |
188 | /* No need to clear memory here, cleared in header assemble */ | |
189 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
190 | atomic_inc(&smBufAllocCount); | |
4498eed5 SF |
191 | #ifdef CONFIG_CIFS_STATS2 |
192 | atomic_inc(&totSmBufAllocCount); | |
193 | #endif /* CONFIG_CIFS_STATS2 */ | |
194 | ||
1da177e4 LT |
195 | } |
196 | return ret_buf; | |
197 | } | |
198 | ||
199 | void | |
200 | cifs_small_buf_release(void *buf_to_free) | |
201 | { | |
202 | ||
203 | if (buf_to_free == NULL) { | |
204 | cFYI(1, ("Null buffer passed to cifs_small_buf_release")); | |
205 | return; | |
206 | } | |
fb8c4b14 | 207 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
208 | |
209 | atomic_dec(&smBufAllocCount); | |
210 | return; | |
211 | } | |
212 | ||
fb8c4b14 | 213 | /* |
1982c344 SF |
214 | Find a free multiplex id (SMB mid). Otherwise there could be |
215 | mid collisions which might cause problems, demultiplexing the | |
216 | wrong response to this request. Multiplex ids could collide if | |
217 | one of a series requests takes much longer than the others, or | |
218 | if a very large number of long lived requests (byte range | |
219 | locks or FindNotify requests) are pending. No more than | |
fb8c4b14 | 220 | 64K-1 requests can be outstanding at one time. If no |
1982c344 SF |
221 | mids are available, return zero. A future optimization |
222 | could make the combination of mids and uid the key we use | |
fb8c4b14 | 223 | to demultiplex on (rather than mid alone). |
1982c344 SF |
224 | In addition to the above check, the cifs demultiplex |
225 | code already used the command code as a secondary | |
226 | check of the frame and if signing is negotiated the | |
227 | response would be discarded if the mid were the same | |
228 | but the signature was wrong. Since the mid is not put in the | |
229 | pending queue until later (when it is about to be dispatched) | |
fb8c4b14 | 230 | we do have to limit the number of outstanding requests |
1982c344 SF |
231 | to somewhat less than 64K-1 although it is hard to imagine |
232 | so many threads being in the vfs at one time. | |
233 | */ | |
234 | __u16 GetNextMid(struct TCP_Server_Info *server) | |
235 | { | |
236 | __u16 mid = 0; | |
237 | __u16 last_mid; | |
fb8c4b14 | 238 | int collision; |
1982c344 | 239 | |
790fe579 | 240 | if (server == NULL) |
1982c344 SF |
241 | return mid; |
242 | ||
243 | spin_lock(&GlobalMid_Lock); | |
244 | last_mid = server->CurrentMid; /* we do not want to loop forever */ | |
245 | server->CurrentMid++; | |
246 | /* This nested loop looks more expensive than it is. | |
fb8c4b14 | 247 | In practice the list of pending requests is short, |
1982c344 SF |
248 | fewer than 50, and the mids are likely to be unique |
249 | on the first pass through the loop unless some request | |
250 | takes longer than the 64 thousand requests before it | |
251 | (and it would also have to have been a request that | |
252 | did not time out) */ | |
fb8c4b14 | 253 | while (server->CurrentMid != last_mid) { |
1982c344 SF |
254 | struct list_head *tmp; |
255 | struct mid_q_entry *mid_entry; | |
256 | ||
257 | collision = 0; | |
790fe579 | 258 | if (server->CurrentMid == 0) |
1982c344 SF |
259 | server->CurrentMid++; |
260 | ||
261 | list_for_each(tmp, &server->pending_mid_q) { | |
262 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); | |
263 | ||
264 | if ((mid_entry->mid == server->CurrentMid) && | |
265 | (mid_entry->midState == MID_REQUEST_SUBMITTED)) { | |
266 | /* This mid is in use, try a different one */ | |
267 | collision = 1; | |
268 | break; | |
269 | } | |
270 | } | |
790fe579 | 271 | if (collision == 0) { |
1982c344 SF |
272 | mid = server->CurrentMid; |
273 | break; | |
274 | } | |
275 | server->CurrentMid++; | |
276 | } | |
277 | spin_unlock(&GlobalMid_Lock); | |
278 | return mid; | |
279 | } | |
280 | ||
281 | /* NB: MID can not be set if treeCon not passed in, in that | |
282 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
283 | void |
284 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
285 | const struct cifsTconInfo *treeCon, int word_count | |
286 | /* length of fixed section (word count) in two byte units */) | |
287 | { | |
fb8c4b14 SF |
288 | struct list_head *temp_item; |
289 | struct cifsSesInfo *ses; | |
1da177e4 LT |
290 | char *temp = (char *) buffer; |
291 | ||
fb8c4b14 | 292 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 LT |
293 | |
294 | buffer->smb_buf_length = | |
630f3f0c | 295 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 LT |
296 | 4 /* RFC 1001 length field does not count */ + |
297 | 2 /* for bcc field itself */ ; | |
1982c344 SF |
298 | /* Note that this is the only network field that has to be converted |
299 | to big endian and it is done just before we send it */ | |
1da177e4 LT |
300 | |
301 | buffer->Protocol[0] = 0xFF; | |
302 | buffer->Protocol[1] = 'S'; | |
303 | buffer->Protocol[2] = 'M'; | |
304 | buffer->Protocol[3] = 'B'; | |
305 | buffer->Command = smb_command; | |
306 | buffer->Flags = 0x00; /* case sensitive */ | |
307 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
308 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
309 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
310 | if (treeCon) { |
311 | buffer->Tid = treeCon->tid; | |
312 | if (treeCon->ses) { | |
313 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
314 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 315 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 316 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 317 | |
1982c344 SF |
318 | /* Uid is not converted */ |
319 | buffer->Uid = treeCon->ses->Suid; | |
320 | buffer->Mid = GetNextMid(treeCon->ses->server); | |
790fe579 | 321 | if (multiuser_mount != 0) { |
1da177e4 LT |
322 | /* For the multiuser case, there are few obvious technically */ |
323 | /* possible mechanisms to match the local linux user (uid) */ | |
324 | /* to a valid remote smb user (smb_uid): */ | |
325 | /* 1) Query Winbind (or other local pam/nss daemon */ | |
326 | /* for userid/password/logon_domain or credential */ | |
327 | /* 2) Query Winbind for uid to sid to username mapping */ | |
328 | /* and see if we have a matching password for existing*/ | |
329 | /* session for that user perhas getting password by */ | |
330 | /* adding a new pam_cifs module that stores passwords */ | |
331 | /* so that the cifs vfs can get at that for all logged*/ | |
332 | /* on users */ | |
333 | /* 3) (Which is the mechanism we have chosen) */ | |
334 | /* Search through sessions to the same server for a */ | |
335 | /* a match on the uid that was passed in on mount */ | |
336 | /* with the current processes uid (or euid?) and use */ | |
337 | /* that smb uid. If no existing smb session for */ | |
338 | /* that uid found, use the default smb session ie */ | |
339 | /* the smb session for the volume mounted which is */ | |
340 | /* the same as would be used if the multiuser mount */ | |
341 | /* flag were disabled. */ | |
342 | ||
343 | /* BB Add support for establishing new tCon and SMB Session */ | |
fb8c4b14 | 344 | /* with userid/password pairs found on the smb session */ |
1da177e4 | 345 | /* for other target tcp/ip addresses BB */ |
790fe579 | 346 | if (current->fsuid != treeCon->ses->linux_uid) { |
63135e08 SF |
347 | cFYI(1, ("Multiuser mode and UID " |
348 | "did not match tcon uid")); | |
14fbf50d JL |
349 | read_lock(&cifs_tcp_ses_lock); |
350 | list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) { | |
351 | ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list); | |
790fe579 SF |
352 | if (ses->linux_uid == current->fsuid) { |
353 | if (ses->server == treeCon->ses->server) { | |
fb8c4b14 | 354 | cFYI(1, ("found matching uid substitute right smb_uid")); |
1da177e4 LT |
355 | buffer->Uid = ses->Suid; |
356 | break; | |
357 | } else { | |
fb8c4b14 SF |
358 | /* BB eventually call cifs_setup_session here */ |
359 | cFYI(1, ("local UID found but no smb sess with this server exists")); | |
1da177e4 LT |
360 | } |
361 | } | |
362 | } | |
14fbf50d | 363 | read_unlock(&cifs_tcp_ses_lock); |
1da177e4 LT |
364 | } |
365 | } | |
366 | } | |
367 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
368 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
369 | if (treeCon->nocase) |
370 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 SF |
371 | if ((treeCon->ses) && (treeCon->ses->server)) |
372 | if (treeCon->ses->server->secMode & | |
1da177e4 LT |
373 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
374 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
375 | } | |
376 | ||
377 | /* endian conversion of flags is now done just before sending */ | |
378 | buffer->WordCount = (char) word_count; | |
379 | return; | |
380 | } | |
381 | ||
2cd646a2 | 382 | static int |
1da177e4 LT |
383 | checkSMBhdr(struct smb_hdr *smb, __u16 mid) |
384 | { | |
fb8c4b14 | 385 | /* Make sure that this really is an SMB, that it is a response, |
1da177e4 | 386 | and that the message ids match */ |
fb8c4b14 SF |
387 | if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) && |
388 | (mid == smb->Mid)) { | |
790fe579 | 389 | if (smb->Flags & SMBFLG_RESPONSE) |
fb8c4b14 SF |
390 | return 0; |
391 | else { | |
1da177e4 | 392 | /* only one valid case where server sends us request */ |
790fe579 | 393 | if (smb->Command == SMB_COM_LOCKING_ANDX) |
1da177e4 LT |
394 | return 0; |
395 | else | |
fb8c4b14 | 396 | cERROR(1, ("Received Request not response")); |
1da177e4 LT |
397 | } |
398 | } else { /* bad signature or mid */ | |
399 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) | |
400 | cERROR(1, | |
6ab16d24 | 401 | ("Bad protocol string signature header %x", |
1da177e4 LT |
402 | *(unsigned int *) smb->Protocol)); |
403 | if (mid != smb->Mid) | |
404 | cERROR(1, ("Mids do not match")); | |
405 | } | |
406 | cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid)); | |
407 | return 1; | |
408 | } | |
409 | ||
410 | int | |
d103e164 | 411 | checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length) |
1da177e4 | 412 | { |
70ca734a | 413 | __u32 len = smb->smb_buf_length; |
190fdeb8 | 414 | __u32 clc_len; /* calculated length */ |
184ed211 | 415 | cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len)); |
d103e164 | 416 | |
630f3f0c SF |
417 | if (length < 2 + sizeof(struct smb_hdr)) { |
418 | if ((length >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 419 | && (smb->Status.CifsError != 0)) { |
d103e164 SF |
420 | smb->WordCount = 0; |
421 | /* some error cases do not return wct and bcc */ | |
422 | return 0; | |
fb8c4b14 | 423 | } else if ((length == sizeof(struct smb_hdr) + 1) && |
d103e164 | 424 | (smb->WordCount == 0)) { |
fb8c4b14 | 425 | char *tmp = (char *)smb; |
d103e164 SF |
426 | /* Need to work around a bug in two servers here */ |
427 | /* First, check if the part of bcc they sent was zero */ | |
428 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
429 | /* some servers return only half of bcc | |
430 | * on simple responses (wct, bcc both zero) | |
431 | * in particular have seen this on | |
432 | * ulogoffX and FindClose. This leaves | |
433 | * one byte of bcc potentially unitialized | |
434 | */ | |
435 | /* zero rest of bcc */ | |
436 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 437 | return 0; |
1da177e4 | 438 | } |
fb8c4b14 | 439 | cERROR(1, ("rcvd invalid byte count (bcc)")); |
d103e164 SF |
440 | } else { |
441 | cERROR(1, ("Length less than smb header size")); | |
1da177e4 | 442 | } |
d103e164 SF |
443 | return 1; |
444 | } | |
445 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
446 | cERROR(1, ("smb length greater than MaxBufSize, mid=%d", | |
184ed211 | 447 | smb->Mid)); |
1da177e4 LT |
448 | return 1; |
449 | } | |
450 | ||
451 | if (checkSMBhdr(smb, mid)) | |
452 | return 1; | |
190fdeb8 | 453 | clc_len = smbCalcSize_LE(smb); |
184ed211 | 454 | |
790fe579 | 455 | if (4 + len != length) { |
63135e08 SF |
456 | cERROR(1, ("Length read does not match RFC1001 length %d", |
457 | len)); | |
184ed211 SF |
458 | return 1; |
459 | } | |
460 | ||
461 | if (4 + len != clc_len) { | |
462 | /* check if bcc wrapped around for large read responses */ | |
790fe579 | 463 | if ((len > 64 * 1024) && (len > clc_len)) { |
184ed211 | 464 | /* check if lengths match mod 64K */ |
790fe579 | 465 | if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 466 | return 0; /* bcc wrapped */ |
184ed211 | 467 | } |
46c79a64 SF |
468 | cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d", |
469 | clc_len, 4 + len, smb->Mid)); | |
190fdeb8 | 470 | /* Windows XP can return a few bytes too much, presumably |
fb8c4b14 | 471 | an illegal pad, at the end of byte range lock responses |
6ab16d24 | 472 | so we allow for that three byte pad, as long as actual |
190fdeb8 | 473 | received length is as long or longer than calculated length */ |
fb8c4b14 | 474 | /* We have now had to extend this more, since there is a |
6ab16d24 SF |
475 | case in which it needs to be bigger still to handle a |
476 | malformed response to transact2 findfirst from WinXP when | |
477 | access denied is returned and thus bcc and wct are zero | |
478 | but server says length is 0x21 bytes too long as if the server | |
479 | forget to reset the smb rfc1001 length when it reset the | |
480 | wct and bcc to minimum size and drop the t2 parms and data */ | |
790fe579 | 481 | if ((4+len > clc_len) && (len <= clc_len + 512)) |
190fdeb8 | 482 | return 0; |
46c79a64 SF |
483 | else { |
484 | cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d", | |
485 | len, smb->Mid)); | |
190fdeb8 | 486 | return 1; |
46c79a64 | 487 | } |
1da177e4 | 488 | } |
20962438 | 489 | return 0; |
1da177e4 | 490 | } |
4b18f2a9 SF |
491 | |
492 | bool | |
d7c8c94d | 493 | is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) |
fb8c4b14 SF |
494 | { |
495 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; | |
1da177e4 LT |
496 | struct list_head *tmp; |
497 | struct list_head *tmp1; | |
498 | struct cifsTconInfo *tcon; | |
499 | struct cifsFileInfo *netfile; | |
500 | ||
fb8c4b14 | 501 | cFYI(1, ("Checking for oplock break or dnotify response")); |
790fe579 | 502 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 503 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 504 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 505 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 506 | struct file_notify_information *pnotify; |
1da177e4 | 507 | __u32 data_offset = 0; |
790fe579 | 508 | if (pSMBr->ByteCount > sizeof(struct file_notify_information)) { |
1da177e4 LT |
509 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
510 | ||
3979877e SF |
511 | pnotify = (struct file_notify_information *) |
512 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
63135e08 | 513 | cFYI(1, ("dnotify on %s Action: 0x%x", |
aaa9bbe0 | 514 | pnotify->FileName, pnotify->Action)); |
fb8c4b14 | 515 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 516 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 517 | return true; |
1da177e4 | 518 | } |
790fe579 | 519 | if (pSMBr->hdr.Status.CifsError) { |
fb8c4b14 SF |
520 | cFYI(1, ("notify err 0x%d", |
521 | pSMBr->hdr.Status.CifsError)); | |
4b18f2a9 | 522 | return true; |
1da177e4 | 523 | } |
4b18f2a9 | 524 | return false; |
fb8c4b14 | 525 | } |
790fe579 | 526 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 527 | return false; |
790fe579 | 528 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
529 | /* no sense logging error on invalid handle on oplock |
530 | break - harmless race between close request and oplock | |
531 | break response is expected from time to time writing out | |
532 | large dirty files cached on the client */ | |
fb8c4b14 SF |
533 | if ((NT_STATUS_INVALID_HANDLE) == |
534 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
535 | cFYI(1, ("invalid handle on oplock break")); | |
4b18f2a9 | 536 | return true; |
fb8c4b14 | 537 | } else if (ERRbadfid == |
1da177e4 | 538 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 539 | return true; |
1da177e4 | 540 | } else { |
4b18f2a9 | 541 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
542 | } |
543 | } | |
790fe579 | 544 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 545 | return false; |
1da177e4 | 546 | |
fb8c4b14 SF |
547 | cFYI(1, ("oplock type 0x%d level 0x%d", |
548 | pSMB->LockType, pSMB->OplockLevel)); | |
790fe579 | 549 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 550 | return false; |
1da177e4 LT |
551 | |
552 | /* look up tcon based on tid & uid */ | |
553 | read_lock(&GlobalSMBSeslock); | |
554 | list_for_each(tmp, &GlobalTreeConnectionList) { | |
555 | tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList); | |
d7c8c94d | 556 | if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) { |
a4544347 | 557 | cifs_stats_inc(&tcon->num_oplock_brks); |
fb8c4b14 SF |
558 | list_for_each(tmp1, &tcon->openFileList) { |
559 | netfile = list_entry(tmp1, struct cifsFileInfo, | |
57337e42 | 560 | tlist); |
790fe579 | 561 | if (pSMB->Fid == netfile->netfid) { |
1da177e4 LT |
562 | struct cifsInodeInfo *pCifsInode; |
563 | read_unlock(&GlobalSMBSeslock); | |
63135e08 SF |
564 | cFYI(1, |
565 | ("file id match, oplock break")); | |
fb8c4b14 | 566 | pCifsInode = |
1da177e4 | 567 | CIFS_I(netfile->pInode); |
4b18f2a9 | 568 | pCifsInode->clientCanCacheAll = false; |
790fe579 | 569 | if (pSMB->OplockLevel == 0) |
57337e42 | 570 | pCifsInode->clientCanCacheRead |
4b18f2a9 SF |
571 | = false; |
572 | pCifsInode->oplockPending = true; | |
57337e42 SF |
573 | AllocOplockQEntry(netfile->pInode, |
574 | netfile->netfid, | |
575 | tcon); | |
63135e08 SF |
576 | cFYI(1, |
577 | ("about to wake up oplock thread")); | |
790fe579 | 578 | if (oplockThread) |
57337e42 | 579 | wake_up_process(oplockThread); |
4b18f2a9 | 580 | return true; |
1da177e4 LT |
581 | } |
582 | } | |
583 | read_unlock(&GlobalSMBSeslock); | |
fb8c4b14 | 584 | cFYI(1, ("No matching file for oplock break")); |
4b18f2a9 | 585 | return true; |
1da177e4 LT |
586 | } |
587 | } | |
588 | read_unlock(&GlobalSMBSeslock); | |
fb8c4b14 | 589 | cFYI(1, ("Can not process oplock break for non-existent connection")); |
4b18f2a9 | 590 | return true; |
1da177e4 LT |
591 | } |
592 | ||
593 | void | |
594 | dump_smb(struct smb_hdr *smb_buf, int smb_buf_length) | |
595 | { | |
596 | int i, j; | |
597 | char debug_line[17]; | |
598 | unsigned char *buffer; | |
599 | ||
600 | if (traceSMB == 0) | |
601 | return; | |
602 | ||
603 | buffer = (unsigned char *) smb_buf; | |
604 | for (i = 0, j = 0; i < smb_buf_length; i++, j++) { | |
ad7a2926 SF |
605 | if (i % 8 == 0) { |
606 | /* have reached the beginning of line */ | |
1da177e4 LT |
607 | printk(KERN_DEBUG "| "); |
608 | j = 0; | |
609 | } | |
610 | printk("%0#4x ", buffer[i]); | |
611 | debug_line[2 * j] = ' '; | |
612 | if (isprint(buffer[i])) | |
613 | debug_line[1 + (2 * j)] = buffer[i]; | |
614 | else | |
615 | debug_line[1 + (2 * j)] = '_'; | |
616 | ||
ad7a2926 SF |
617 | if (i % 8 == 7) { |
618 | /* reached end of line, time to print ascii */ | |
1da177e4 LT |
619 | debug_line[16] = 0; |
620 | printk(" | %s\n", debug_line); | |
621 | } | |
622 | } | |
623 | for (; j < 8; j++) { | |
624 | printk(" "); | |
625 | debug_line[2 * j] = ' '; | |
626 | debug_line[1 + (2 * j)] = ' '; | |
627 | } | |
ad7a2926 | 628 | printk(" | %s\n", debug_line); |
1da177e4 LT |
629 | return; |
630 | } | |
6a0b4824 | 631 | |
6a0b4824 SF |
632 | /* Windows maps these to the user defined 16 bit Unicode range since they are |
633 | reserved symbols (along with \ and /), otherwise illegal to store | |
634 | in filenames in NTFS */ | |
d0724714 SF |
635 | #define UNI_ASTERIK (__u16) ('*' + 0xF000) |
636 | #define UNI_QUESTION (__u16) ('?' + 0xF000) | |
637 | #define UNI_COLON (__u16) (':' + 0xF000) | |
638 | #define UNI_GRTRTHAN (__u16) ('>' + 0xF000) | |
639 | #define UNI_LESSTHAN (__u16) ('<' + 0xF000) | |
640 | #define UNI_PIPE (__u16) ('|' + 0xF000) | |
641 | #define UNI_SLASH (__u16) ('\\' + 0xF000) | |
6a0b4824 SF |
642 | |
643 | /* Convert 16 bit Unicode pathname from wire format to string in current code | |
644 | page. Conversion may involve remapping up the seven characters that are | |
645 | only legal in POSIX-like OS (if they are present in the string). Path | |
646 | names are little endian 16 bit Unicode on the wire */ | |
647 | int | |
fb8c4b14 SF |
648 | cifs_convertUCSpath(char *target, const __le16 *source, int maxlen, |
649 | const struct nls_table *cp) | |
6a0b4824 | 650 | { |
fb8c4b14 | 651 | int i, j, len; |
d0724714 | 652 | __u16 src_char; |
6a0b4824 | 653 | |
fb8c4b14 | 654 | for (i = 0, j = 0; i < maxlen; i++) { |
6a0b4824 SF |
655 | src_char = le16_to_cpu(source[i]); |
656 | switch (src_char) { | |
657 | case 0: | |
658 | goto cUCS_out; /* BB check this BB */ | |
659 | case UNI_COLON: | |
660 | target[j] = ':'; | |
661 | break; | |
662 | case UNI_ASTERIK: | |
663 | target[j] = '*'; | |
664 | break; | |
665 | case UNI_QUESTION: | |
666 | target[j] = '?'; | |
667 | break; | |
6c91d362 SF |
668 | /* BB We can not handle remapping slash until |
669 | all the calls to build_path_from_dentry | |
670 | are modified, as they use slash as separator BB */ | |
671 | /* case UNI_SLASH: | |
672 | target[j] = '\\'; | |
673 | break;*/ | |
6a0b4824 SF |
674 | case UNI_PIPE: |
675 | target[j] = '|'; | |
676 | break; | |
677 | case UNI_GRTRTHAN: | |
678 | target[j] = '>'; | |
679 | break; | |
680 | case UNI_LESSTHAN: | |
681 | target[j] = '<'; | |
67594feb | 682 | break; |
fb8c4b14 SF |
683 | default: |
684 | len = cp->uni2char(src_char, &target[j], | |
6a0b4824 | 685 | NLS_MAX_CHARSET_SIZE); |
790fe579 | 686 | if (len > 0) { |
6a0b4824 SF |
687 | j += len; |
688 | continue; | |
689 | } else { | |
690 | target[j] = '?'; | |
691 | } | |
692 | } | |
693 | j++; | |
57337e42 | 694 | /* make sure we do not overrun callers allocated temp buffer */ |
790fe579 | 695 | if (j >= (2 * NAME_MAX)) |
6a0b4824 SF |
696 | break; |
697 | } | |
698 | cUCS_out: | |
699 | target[j] = 0; | |
700 | return j; | |
701 | } | |
6c91d362 SF |
702 | |
703 | /* Convert 16 bit Unicode pathname to wire format from string in current code | |
704 | page. Conversion may involve remapping up the seven characters that are | |
705 | only legal in POSIX-like OS (if they are present in the string). Path | |
706 | names are little endian 16 bit Unicode on the wire */ | |
707 | int | |
fb8c4b14 SF |
708 | cifsConvertToUCS(__le16 *target, const char *source, int maxlen, |
709 | const struct nls_table *cp, int mapChars) | |
6c91d362 | 710 | { |
fb8c4b14 | 711 | int i, j, charlen; |
6c91d362 SF |
712 | int len_remaining = maxlen; |
713 | char src_char; | |
70ca734a | 714 | __u16 temp; |
6c91d362 | 715 | |
790fe579 | 716 | if (!mapChars) |
e89dc920 | 717 | return cifs_strtoUCS(target, source, PATH_MAX, cp); |
6c91d362 | 718 | |
fb8c4b14 | 719 | for (i = 0, j = 0; i < maxlen; j++) { |
6c91d362 SF |
720 | src_char = source[i]; |
721 | switch (src_char) { | |
722 | case 0: | |
f4cfd69c | 723 | target[j] = 0; |
6c91d362 SF |
724 | goto ctoUCS_out; |
725 | case ':': | |
726 | target[j] = cpu_to_le16(UNI_COLON); | |
727 | break; | |
728 | case '*': | |
729 | target[j] = cpu_to_le16(UNI_ASTERIK); | |
730 | break; | |
731 | case '?': | |
732 | target[j] = cpu_to_le16(UNI_QUESTION); | |
733 | break; | |
734 | case '<': | |
735 | target[j] = cpu_to_le16(UNI_LESSTHAN); | |
736 | break; | |
737 | case '>': | |
738 | target[j] = cpu_to_le16(UNI_GRTRTHAN); | |
739 | break; | |
740 | case '|': | |
741 | target[j] = cpu_to_le16(UNI_PIPE); | |
fb8c4b14 | 742 | break; |
6c91d362 SF |
743 | /* BB We can not handle remapping slash until |
744 | all the calls to build_path_from_dentry | |
745 | are modified, as they use slash as separator BB */ | |
746 | /* case '\\': | |
747 | target[j] = cpu_to_le16(UNI_SLASH); | |
748 | break;*/ | |
749 | default: | |
750 | charlen = cp->char2uni(source+i, | |
70ca734a | 751 | len_remaining, &temp); |
6c91d362 SF |
752 | /* if no match, use question mark, which |
753 | at least in some cases servers as wild card */ | |
790fe579 | 754 | if (charlen < 1) { |
6c91d362 SF |
755 | target[j] = cpu_to_le16(0x003f); |
756 | charlen = 1; | |
70ca734a SF |
757 | } else |
758 | target[j] = cpu_to_le16(temp); | |
6c91d362 SF |
759 | len_remaining -= charlen; |
760 | /* character may take more than one byte in the | |
761 | the source string, but will take exactly two | |
762 | bytes in the target string */ | |
fb8c4b14 | 763 | i += charlen; |
6c91d362 SF |
764 | continue; |
765 | } | |
766 | i++; /* move to next char in source string */ | |
767 | len_remaining--; | |
768 | } | |
769 | ||
770 | ctoUCS_out: | |
771 | return i; | |
772 | } |