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); | |
f1987b44 | 82 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
1da177e4 | 83 | init_MUTEX(&ret_buf->sesSem); |
1da177e4 LT |
84 | } |
85 | return ret_buf; | |
86 | } | |
87 | ||
88 | void | |
89 | sesInfoFree(struct cifsSesInfo *buf_to_free) | |
90 | { | |
91 | if (buf_to_free == NULL) { | |
92 | cFYI(1, ("Null buffer passed to sesInfoFree")); | |
93 | return; | |
94 | } | |
95 | ||
1da177e4 | 96 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
97 | kfree(buf_to_free->serverOS); |
98 | kfree(buf_to_free->serverDomain); | |
99 | kfree(buf_to_free->serverNOS); | |
100 | kfree(buf_to_free->password); | |
3979877e | 101 | kfree(buf_to_free->domainName); |
1da177e4 LT |
102 | kfree(buf_to_free); |
103 | } | |
104 | ||
105 | struct cifsTconInfo * | |
106 | tconInfoAlloc(void) | |
107 | { | |
108 | struct cifsTconInfo *ret_buf; | |
630f3f0c | 109 | ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL); |
1da177e4 | 110 | if (ret_buf) { |
1da177e4 | 111 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 112 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 113 | ++ret_buf->tc_count; |
1da177e4 | 114 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 115 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
1da177e4 LT |
116 | #ifdef CONFIG_CIFS_STATS |
117 | spin_lock_init(&ret_buf->stat_lock); | |
118 | #endif | |
1da177e4 LT |
119 | } |
120 | return ret_buf; | |
121 | } | |
122 | ||
123 | void | |
124 | tconInfoFree(struct cifsTconInfo *buf_to_free) | |
125 | { | |
126 | if (buf_to_free == NULL) { | |
127 | cFYI(1, ("Null buffer passed to tconInfoFree")); | |
128 | return; | |
129 | } | |
1da177e4 | 130 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 131 | kfree(buf_to_free->nativeFileSystem); |
1da177e4 LT |
132 | kfree(buf_to_free); |
133 | } | |
134 | ||
135 | struct smb_hdr * | |
136 | cifs_buf_get(void) | |
137 | { | |
138 | struct smb_hdr *ret_buf = NULL; | |
139 | ||
fb8c4b14 SF |
140 | /* We could use negotiated size instead of max_msgsize - |
141 | but it may be more efficient to always alloc same size | |
142 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 143 | defaults to this and can not be bigger */ |
232087cb | 144 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
145 | |
146 | /* clear the first few header bytes */ | |
147 | /* for most paths, more is cleared in header_assemble */ | |
148 | if (ret_buf) { | |
149 | memset(ret_buf, 0, sizeof(struct smb_hdr) + 3); | |
150 | atomic_inc(&bufAllocCount); | |
4498eed5 SF |
151 | #ifdef CONFIG_CIFS_STATS2 |
152 | atomic_inc(&totBufAllocCount); | |
153 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
154 | } |
155 | ||
156 | return ret_buf; | |
157 | } | |
158 | ||
159 | void | |
160 | cifs_buf_release(void *buf_to_free) | |
161 | { | |
1da177e4 LT |
162 | if (buf_to_free == NULL) { |
163 | /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/ | |
164 | return; | |
165 | } | |
fb8c4b14 | 166 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
167 | |
168 | atomic_dec(&bufAllocCount); | |
169 | return; | |
170 | } | |
171 | ||
172 | struct smb_hdr * | |
173 | cifs_small_buf_get(void) | |
174 | { | |
175 | struct smb_hdr *ret_buf = NULL; | |
176 | ||
fb8c4b14 SF |
177 | /* We could use negotiated size instead of max_msgsize - |
178 | but it may be more efficient to always alloc same size | |
179 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 180 | defaults to this and can not be bigger */ |
232087cb | 181 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
182 | if (ret_buf) { |
183 | /* No need to clear memory here, cleared in header assemble */ | |
184 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
185 | atomic_inc(&smBufAllocCount); | |
4498eed5 SF |
186 | #ifdef CONFIG_CIFS_STATS2 |
187 | atomic_inc(&totSmBufAllocCount); | |
188 | #endif /* CONFIG_CIFS_STATS2 */ | |
189 | ||
1da177e4 LT |
190 | } |
191 | return ret_buf; | |
192 | } | |
193 | ||
194 | void | |
195 | cifs_small_buf_release(void *buf_to_free) | |
196 | { | |
197 | ||
198 | if (buf_to_free == NULL) { | |
199 | cFYI(1, ("Null buffer passed to cifs_small_buf_release")); | |
200 | return; | |
201 | } | |
fb8c4b14 | 202 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
203 | |
204 | atomic_dec(&smBufAllocCount); | |
205 | return; | |
206 | } | |
207 | ||
fb8c4b14 | 208 | /* |
1982c344 SF |
209 | Find a free multiplex id (SMB mid). Otherwise there could be |
210 | mid collisions which might cause problems, demultiplexing the | |
211 | wrong response to this request. Multiplex ids could collide if | |
212 | one of a series requests takes much longer than the others, or | |
213 | if a very large number of long lived requests (byte range | |
214 | locks or FindNotify requests) are pending. No more than | |
fb8c4b14 | 215 | 64K-1 requests can be outstanding at one time. If no |
1982c344 SF |
216 | mids are available, return zero. A future optimization |
217 | could make the combination of mids and uid the key we use | |
fb8c4b14 | 218 | to demultiplex on (rather than mid alone). |
1982c344 SF |
219 | In addition to the above check, the cifs demultiplex |
220 | code already used the command code as a secondary | |
221 | check of the frame and if signing is negotiated the | |
222 | response would be discarded if the mid were the same | |
223 | but the signature was wrong. Since the mid is not put in the | |
224 | pending queue until later (when it is about to be dispatched) | |
fb8c4b14 | 225 | we do have to limit the number of outstanding requests |
1982c344 SF |
226 | to somewhat less than 64K-1 although it is hard to imagine |
227 | so many threads being in the vfs at one time. | |
228 | */ | |
229 | __u16 GetNextMid(struct TCP_Server_Info *server) | |
230 | { | |
231 | __u16 mid = 0; | |
232 | __u16 last_mid; | |
fb8c4b14 | 233 | int collision; |
1982c344 | 234 | |
790fe579 | 235 | if (server == NULL) |
1982c344 SF |
236 | return mid; |
237 | ||
238 | spin_lock(&GlobalMid_Lock); | |
239 | last_mid = server->CurrentMid; /* we do not want to loop forever */ | |
240 | server->CurrentMid++; | |
241 | /* This nested loop looks more expensive than it is. | |
fb8c4b14 | 242 | In practice the list of pending requests is short, |
1982c344 SF |
243 | fewer than 50, and the mids are likely to be unique |
244 | on the first pass through the loop unless some request | |
245 | takes longer than the 64 thousand requests before it | |
246 | (and it would also have to have been a request that | |
247 | did not time out) */ | |
fb8c4b14 | 248 | while (server->CurrentMid != last_mid) { |
1982c344 SF |
249 | struct list_head *tmp; |
250 | struct mid_q_entry *mid_entry; | |
251 | ||
252 | collision = 0; | |
790fe579 | 253 | if (server->CurrentMid == 0) |
1982c344 SF |
254 | server->CurrentMid++; |
255 | ||
256 | list_for_each(tmp, &server->pending_mid_q) { | |
257 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); | |
258 | ||
259 | if ((mid_entry->mid == server->CurrentMid) && | |
260 | (mid_entry->midState == MID_REQUEST_SUBMITTED)) { | |
261 | /* This mid is in use, try a different one */ | |
262 | collision = 1; | |
263 | break; | |
264 | } | |
265 | } | |
790fe579 | 266 | if (collision == 0) { |
1982c344 SF |
267 | mid = server->CurrentMid; |
268 | break; | |
269 | } | |
270 | server->CurrentMid++; | |
271 | } | |
272 | spin_unlock(&GlobalMid_Lock); | |
273 | return mid; | |
274 | } | |
275 | ||
276 | /* NB: MID can not be set if treeCon not passed in, in that | |
277 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
278 | void |
279 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
280 | const struct cifsTconInfo *treeCon, int word_count | |
281 | /* length of fixed section (word count) in two byte units */) | |
282 | { | |
fb8c4b14 SF |
283 | struct list_head *temp_item; |
284 | struct cifsSesInfo *ses; | |
1da177e4 LT |
285 | char *temp = (char *) buffer; |
286 | ||
fb8c4b14 | 287 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 LT |
288 | |
289 | buffer->smb_buf_length = | |
630f3f0c | 290 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 LT |
291 | 4 /* RFC 1001 length field does not count */ + |
292 | 2 /* for bcc field itself */ ; | |
1982c344 SF |
293 | /* Note that this is the only network field that has to be converted |
294 | to big endian and it is done just before we send it */ | |
1da177e4 LT |
295 | |
296 | buffer->Protocol[0] = 0xFF; | |
297 | buffer->Protocol[1] = 'S'; | |
298 | buffer->Protocol[2] = 'M'; | |
299 | buffer->Protocol[3] = 'B'; | |
300 | buffer->Command = smb_command; | |
301 | buffer->Flags = 0x00; /* case sensitive */ | |
302 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
303 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
304 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
305 | if (treeCon) { |
306 | buffer->Tid = treeCon->tid; | |
307 | if (treeCon->ses) { | |
308 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
309 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 310 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 311 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 312 | |
1982c344 SF |
313 | /* Uid is not converted */ |
314 | buffer->Uid = treeCon->ses->Suid; | |
315 | buffer->Mid = GetNextMid(treeCon->ses->server); | |
790fe579 | 316 | if (multiuser_mount != 0) { |
1da177e4 LT |
317 | /* For the multiuser case, there are few obvious technically */ |
318 | /* possible mechanisms to match the local linux user (uid) */ | |
319 | /* to a valid remote smb user (smb_uid): */ | |
320 | /* 1) Query Winbind (or other local pam/nss daemon */ | |
321 | /* for userid/password/logon_domain or credential */ | |
322 | /* 2) Query Winbind for uid to sid to username mapping */ | |
323 | /* and see if we have a matching password for existing*/ | |
324 | /* session for that user perhas getting password by */ | |
325 | /* adding a new pam_cifs module that stores passwords */ | |
326 | /* so that the cifs vfs can get at that for all logged*/ | |
327 | /* on users */ | |
328 | /* 3) (Which is the mechanism we have chosen) */ | |
329 | /* Search through sessions to the same server for a */ | |
330 | /* a match on the uid that was passed in on mount */ | |
331 | /* with the current processes uid (or euid?) and use */ | |
332 | /* that smb uid. If no existing smb session for */ | |
333 | /* that uid found, use the default smb session ie */ | |
334 | /* the smb session for the volume mounted which is */ | |
335 | /* the same as would be used if the multiuser mount */ | |
336 | /* flag were disabled. */ | |
337 | ||
338 | /* BB Add support for establishing new tCon and SMB Session */ | |
fb8c4b14 | 339 | /* with userid/password pairs found on the smb session */ |
1da177e4 | 340 | /* for other target tcp/ip addresses BB */ |
790fe579 | 341 | if (current->fsuid != treeCon->ses->linux_uid) { |
63135e08 SF |
342 | cFYI(1, ("Multiuser mode and UID " |
343 | "did not match tcon uid")); | |
14fbf50d JL |
344 | read_lock(&cifs_tcp_ses_lock); |
345 | list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) { | |
346 | ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list); | |
790fe579 SF |
347 | if (ses->linux_uid == current->fsuid) { |
348 | if (ses->server == treeCon->ses->server) { | |
fb8c4b14 | 349 | cFYI(1, ("found matching uid substitute right smb_uid")); |
1da177e4 LT |
350 | buffer->Uid = ses->Suid; |
351 | break; | |
352 | } else { | |
fb8c4b14 SF |
353 | /* BB eventually call cifs_setup_session here */ |
354 | cFYI(1, ("local UID found but no smb sess with this server exists")); | |
1da177e4 LT |
355 | } |
356 | } | |
357 | } | |
14fbf50d | 358 | read_unlock(&cifs_tcp_ses_lock); |
1da177e4 LT |
359 | } |
360 | } | |
361 | } | |
362 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
363 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
364 | if (treeCon->nocase) |
365 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 SF |
366 | if ((treeCon->ses) && (treeCon->ses->server)) |
367 | if (treeCon->ses->server->secMode & | |
1da177e4 LT |
368 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
369 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
370 | } | |
371 | ||
372 | /* endian conversion of flags is now done just before sending */ | |
373 | buffer->WordCount = (char) word_count; | |
374 | return; | |
375 | } | |
376 | ||
2cd646a2 | 377 | static int |
1da177e4 LT |
378 | checkSMBhdr(struct smb_hdr *smb, __u16 mid) |
379 | { | |
fb8c4b14 | 380 | /* Make sure that this really is an SMB, that it is a response, |
1da177e4 | 381 | and that the message ids match */ |
fb8c4b14 SF |
382 | if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) && |
383 | (mid == smb->Mid)) { | |
790fe579 | 384 | if (smb->Flags & SMBFLG_RESPONSE) |
fb8c4b14 SF |
385 | return 0; |
386 | else { | |
1da177e4 | 387 | /* only one valid case where server sends us request */ |
790fe579 | 388 | if (smb->Command == SMB_COM_LOCKING_ANDX) |
1da177e4 LT |
389 | return 0; |
390 | else | |
fb8c4b14 | 391 | cERROR(1, ("Received Request not response")); |
1da177e4 LT |
392 | } |
393 | } else { /* bad signature or mid */ | |
394 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) | |
395 | cERROR(1, | |
6ab16d24 | 396 | ("Bad protocol string signature header %x", |
1da177e4 LT |
397 | *(unsigned int *) smb->Protocol)); |
398 | if (mid != smb->Mid) | |
399 | cERROR(1, ("Mids do not match")); | |
400 | } | |
401 | cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid)); | |
402 | return 1; | |
403 | } | |
404 | ||
405 | int | |
d103e164 | 406 | checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length) |
1da177e4 | 407 | { |
70ca734a | 408 | __u32 len = smb->smb_buf_length; |
190fdeb8 | 409 | __u32 clc_len; /* calculated length */ |
184ed211 | 410 | cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len)); |
d103e164 | 411 | |
630f3f0c SF |
412 | if (length < 2 + sizeof(struct smb_hdr)) { |
413 | if ((length >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 414 | && (smb->Status.CifsError != 0)) { |
d103e164 SF |
415 | smb->WordCount = 0; |
416 | /* some error cases do not return wct and bcc */ | |
417 | return 0; | |
fb8c4b14 | 418 | } else if ((length == sizeof(struct smb_hdr) + 1) && |
d103e164 | 419 | (smb->WordCount == 0)) { |
fb8c4b14 | 420 | char *tmp = (char *)smb; |
d103e164 SF |
421 | /* Need to work around a bug in two servers here */ |
422 | /* First, check if the part of bcc they sent was zero */ | |
423 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
424 | /* some servers return only half of bcc | |
425 | * on simple responses (wct, bcc both zero) | |
426 | * in particular have seen this on | |
427 | * ulogoffX and FindClose. This leaves | |
428 | * one byte of bcc potentially unitialized | |
429 | */ | |
430 | /* zero rest of bcc */ | |
431 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 432 | return 0; |
1da177e4 | 433 | } |
fb8c4b14 | 434 | cERROR(1, ("rcvd invalid byte count (bcc)")); |
d103e164 SF |
435 | } else { |
436 | cERROR(1, ("Length less than smb header size")); | |
1da177e4 | 437 | } |
d103e164 SF |
438 | return 1; |
439 | } | |
440 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
441 | cERROR(1, ("smb length greater than MaxBufSize, mid=%d", | |
184ed211 | 442 | smb->Mid)); |
1da177e4 LT |
443 | return 1; |
444 | } | |
445 | ||
446 | if (checkSMBhdr(smb, mid)) | |
447 | return 1; | |
190fdeb8 | 448 | clc_len = smbCalcSize_LE(smb); |
184ed211 | 449 | |
790fe579 | 450 | if (4 + len != length) { |
63135e08 SF |
451 | cERROR(1, ("Length read does not match RFC1001 length %d", |
452 | len)); | |
184ed211 SF |
453 | return 1; |
454 | } | |
455 | ||
456 | if (4 + len != clc_len) { | |
457 | /* check if bcc wrapped around for large read responses */ | |
790fe579 | 458 | if ((len > 64 * 1024) && (len > clc_len)) { |
184ed211 | 459 | /* check if lengths match mod 64K */ |
790fe579 | 460 | if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 461 | return 0; /* bcc wrapped */ |
184ed211 | 462 | } |
46c79a64 SF |
463 | cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d", |
464 | clc_len, 4 + len, smb->Mid)); | |
190fdeb8 | 465 | /* Windows XP can return a few bytes too much, presumably |
fb8c4b14 | 466 | an illegal pad, at the end of byte range lock responses |
6ab16d24 | 467 | so we allow for that three byte pad, as long as actual |
190fdeb8 | 468 | received length is as long or longer than calculated length */ |
fb8c4b14 | 469 | /* We have now had to extend this more, since there is a |
6ab16d24 SF |
470 | case in which it needs to be bigger still to handle a |
471 | malformed response to transact2 findfirst from WinXP when | |
472 | access denied is returned and thus bcc and wct are zero | |
473 | but server says length is 0x21 bytes too long as if the server | |
474 | forget to reset the smb rfc1001 length when it reset the | |
475 | wct and bcc to minimum size and drop the t2 parms and data */ | |
790fe579 | 476 | if ((4+len > clc_len) && (len <= clc_len + 512)) |
190fdeb8 | 477 | return 0; |
46c79a64 SF |
478 | else { |
479 | cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d", | |
480 | len, smb->Mid)); | |
190fdeb8 | 481 | return 1; |
46c79a64 | 482 | } |
1da177e4 | 483 | } |
20962438 | 484 | return 0; |
1da177e4 | 485 | } |
4b18f2a9 SF |
486 | |
487 | bool | |
d7c8c94d | 488 | is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) |
fb8c4b14 SF |
489 | { |
490 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; | |
f1987b44 JL |
491 | struct list_head *tmp, *tmp1, *tmp2; |
492 | struct cifsSesInfo *ses; | |
1da177e4 | 493 | struct cifsTconInfo *tcon; |
f1987b44 | 494 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
495 | struct cifsFileInfo *netfile; |
496 | ||
fb8c4b14 | 497 | cFYI(1, ("Checking for oplock break or dnotify response")); |
790fe579 | 498 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 499 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 500 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 501 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 502 | struct file_notify_information *pnotify; |
1da177e4 | 503 | __u32 data_offset = 0; |
790fe579 | 504 | if (pSMBr->ByteCount > sizeof(struct file_notify_information)) { |
1da177e4 LT |
505 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
506 | ||
3979877e SF |
507 | pnotify = (struct file_notify_information *) |
508 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
63135e08 | 509 | cFYI(1, ("dnotify on %s Action: 0x%x", |
aaa9bbe0 | 510 | pnotify->FileName, pnotify->Action)); |
fb8c4b14 | 511 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 512 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 513 | return true; |
1da177e4 | 514 | } |
790fe579 | 515 | if (pSMBr->hdr.Status.CifsError) { |
fb8c4b14 SF |
516 | cFYI(1, ("notify err 0x%d", |
517 | pSMBr->hdr.Status.CifsError)); | |
4b18f2a9 | 518 | return true; |
1da177e4 | 519 | } |
4b18f2a9 | 520 | return false; |
fb8c4b14 | 521 | } |
790fe579 | 522 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 523 | return false; |
790fe579 | 524 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
525 | /* no sense logging error on invalid handle on oplock |
526 | break - harmless race between close request and oplock | |
527 | break response is expected from time to time writing out | |
528 | large dirty files cached on the client */ | |
fb8c4b14 SF |
529 | if ((NT_STATUS_INVALID_HANDLE) == |
530 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
531 | cFYI(1, ("invalid handle on oplock break")); | |
4b18f2a9 | 532 | return true; |
fb8c4b14 | 533 | } else if (ERRbadfid == |
1da177e4 | 534 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 535 | return true; |
1da177e4 | 536 | } else { |
4b18f2a9 | 537 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
538 | } |
539 | } | |
790fe579 | 540 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 541 | return false; |
1da177e4 | 542 | |
fb8c4b14 SF |
543 | cFYI(1, ("oplock type 0x%d level 0x%d", |
544 | pSMB->LockType, pSMB->OplockLevel)); | |
790fe579 | 545 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 546 | return false; |
1da177e4 LT |
547 | |
548 | /* look up tcon based on tid & uid */ | |
f1987b44 JL |
549 | read_lock(&cifs_tcp_ses_lock); |
550 | list_for_each(tmp, &srv->smb_ses_list) { | |
551 | ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list); | |
552 | list_for_each(tmp1, &ses->tcon_list) { | |
553 | tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list); | |
554 | if (tcon->tid != buf->Tid) | |
555 | continue; | |
556 | ||
a4544347 | 557 | cifs_stats_inc(&tcon->num_oplock_brks); |
ddb4cbfc | 558 | write_lock(&GlobalSMBSeslock); |
f1987b44 JL |
559 | list_for_each(tmp2, &tcon->openFileList) { |
560 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 561 | tlist); |
f1987b44 JL |
562 | if (pSMB->Fid != netfile->netfid) |
563 | continue; | |
564 | ||
ddb4cbfc | 565 | write_unlock(&GlobalSMBSeslock); |
f1987b44 JL |
566 | read_unlock(&cifs_tcp_ses_lock); |
567 | cFYI(1, ("file id match, oplock break")); | |
568 | pCifsInode = CIFS_I(netfile->pInode); | |
569 | pCifsInode->clientCanCacheAll = false; | |
570 | if (pSMB->OplockLevel == 0) | |
571 | pCifsInode->clientCanCacheRead = false; | |
572 | pCifsInode->oplockPending = true; | |
573 | AllocOplockQEntry(netfile->pInode, | |
574 | netfile->netfid, tcon); | |
575 | cFYI(1, ("about to wake up oplock thread")); | |
576 | if (oplockThread) | |
577 | wake_up_process(oplockThread); | |
578 | ||
579 | return true; | |
1da177e4 | 580 | } |
ddb4cbfc | 581 | write_unlock(&GlobalSMBSeslock); |
f1987b44 | 582 | read_unlock(&cifs_tcp_ses_lock); |
fb8c4b14 | 583 | cFYI(1, ("No matching file for oplock break")); |
4b18f2a9 | 584 | return true; |
1da177e4 LT |
585 | } |
586 | } | |
f1987b44 | 587 | read_unlock(&cifs_tcp_ses_lock); |
fb8c4b14 | 588 | cFYI(1, ("Can not process oplock break for non-existent connection")); |
4b18f2a9 | 589 | return true; |
1da177e4 LT |
590 | } |
591 | ||
592 | void | |
593 | dump_smb(struct smb_hdr *smb_buf, int smb_buf_length) | |
594 | { | |
595 | int i, j; | |
596 | char debug_line[17]; | |
597 | unsigned char *buffer; | |
598 | ||
599 | if (traceSMB == 0) | |
600 | return; | |
601 | ||
602 | buffer = (unsigned char *) smb_buf; | |
603 | for (i = 0, j = 0; i < smb_buf_length; i++, j++) { | |
ad7a2926 SF |
604 | if (i % 8 == 0) { |
605 | /* have reached the beginning of line */ | |
1da177e4 LT |
606 | printk(KERN_DEBUG "| "); |
607 | j = 0; | |
608 | } | |
609 | printk("%0#4x ", buffer[i]); | |
610 | debug_line[2 * j] = ' '; | |
611 | if (isprint(buffer[i])) | |
612 | debug_line[1 + (2 * j)] = buffer[i]; | |
613 | else | |
614 | debug_line[1 + (2 * j)] = '_'; | |
615 | ||
ad7a2926 SF |
616 | if (i % 8 == 7) { |
617 | /* reached end of line, time to print ascii */ | |
1da177e4 LT |
618 | debug_line[16] = 0; |
619 | printk(" | %s\n", debug_line); | |
620 | } | |
621 | } | |
622 | for (; j < 8; j++) { | |
623 | printk(" "); | |
624 | debug_line[2 * j] = ' '; | |
625 | debug_line[1 + (2 * j)] = ' '; | |
626 | } | |
ad7a2926 | 627 | printk(" | %s\n", debug_line); |
1da177e4 LT |
628 | return; |
629 | } | |
6a0b4824 | 630 | |
6a0b4824 SF |
631 | /* Windows maps these to the user defined 16 bit Unicode range since they are |
632 | reserved symbols (along with \ and /), otherwise illegal to store | |
633 | in filenames in NTFS */ | |
d0724714 SF |
634 | #define UNI_ASTERIK (__u16) ('*' + 0xF000) |
635 | #define UNI_QUESTION (__u16) ('?' + 0xF000) | |
636 | #define UNI_COLON (__u16) (':' + 0xF000) | |
637 | #define UNI_GRTRTHAN (__u16) ('>' + 0xF000) | |
638 | #define UNI_LESSTHAN (__u16) ('<' + 0xF000) | |
639 | #define UNI_PIPE (__u16) ('|' + 0xF000) | |
640 | #define UNI_SLASH (__u16) ('\\' + 0xF000) | |
6a0b4824 SF |
641 | |
642 | /* Convert 16 bit Unicode pathname from wire format to string in current code | |
643 | page. Conversion may involve remapping up the seven characters that are | |
644 | only legal in POSIX-like OS (if they are present in the string). Path | |
645 | names are little endian 16 bit Unicode on the wire */ | |
646 | int | |
fb8c4b14 SF |
647 | cifs_convertUCSpath(char *target, const __le16 *source, int maxlen, |
648 | const struct nls_table *cp) | |
6a0b4824 | 649 | { |
fb8c4b14 | 650 | int i, j, len; |
d0724714 | 651 | __u16 src_char; |
6a0b4824 | 652 | |
fb8c4b14 | 653 | for (i = 0, j = 0; i < maxlen; i++) { |
6a0b4824 SF |
654 | src_char = le16_to_cpu(source[i]); |
655 | switch (src_char) { | |
656 | case 0: | |
657 | goto cUCS_out; /* BB check this BB */ | |
658 | case UNI_COLON: | |
659 | target[j] = ':'; | |
660 | break; | |
661 | case UNI_ASTERIK: | |
662 | target[j] = '*'; | |
663 | break; | |
664 | case UNI_QUESTION: | |
665 | target[j] = '?'; | |
666 | break; | |
6c91d362 SF |
667 | /* BB We can not handle remapping slash until |
668 | all the calls to build_path_from_dentry | |
669 | are modified, as they use slash as separator BB */ | |
670 | /* case UNI_SLASH: | |
671 | target[j] = '\\'; | |
672 | break;*/ | |
6a0b4824 SF |
673 | case UNI_PIPE: |
674 | target[j] = '|'; | |
675 | break; | |
676 | case UNI_GRTRTHAN: | |
677 | target[j] = '>'; | |
678 | break; | |
679 | case UNI_LESSTHAN: | |
680 | target[j] = '<'; | |
67594feb | 681 | break; |
fb8c4b14 SF |
682 | default: |
683 | len = cp->uni2char(src_char, &target[j], | |
6a0b4824 | 684 | NLS_MAX_CHARSET_SIZE); |
790fe579 | 685 | if (len > 0) { |
6a0b4824 SF |
686 | j += len; |
687 | continue; | |
688 | } else { | |
689 | target[j] = '?'; | |
690 | } | |
691 | } | |
692 | j++; | |
57337e42 | 693 | /* make sure we do not overrun callers allocated temp buffer */ |
790fe579 | 694 | if (j >= (2 * NAME_MAX)) |
6a0b4824 SF |
695 | break; |
696 | } | |
697 | cUCS_out: | |
698 | target[j] = 0; | |
699 | return j; | |
700 | } | |
6c91d362 SF |
701 | |
702 | /* Convert 16 bit Unicode pathname to wire format from string in current code | |
703 | page. Conversion may involve remapping up the seven characters that are | |
704 | only legal in POSIX-like OS (if they are present in the string). Path | |
705 | names are little endian 16 bit Unicode on the wire */ | |
706 | int | |
fb8c4b14 SF |
707 | cifsConvertToUCS(__le16 *target, const char *source, int maxlen, |
708 | const struct nls_table *cp, int mapChars) | |
6c91d362 | 709 | { |
fb8c4b14 | 710 | int i, j, charlen; |
6c91d362 SF |
711 | int len_remaining = maxlen; |
712 | char src_char; | |
70ca734a | 713 | __u16 temp; |
6c91d362 | 714 | |
790fe579 | 715 | if (!mapChars) |
e89dc920 | 716 | return cifs_strtoUCS(target, source, PATH_MAX, cp); |
6c91d362 | 717 | |
fb8c4b14 | 718 | for (i = 0, j = 0; i < maxlen; j++) { |
6c91d362 SF |
719 | src_char = source[i]; |
720 | switch (src_char) { | |
721 | case 0: | |
f4cfd69c | 722 | target[j] = 0; |
6c91d362 SF |
723 | goto ctoUCS_out; |
724 | case ':': | |
725 | target[j] = cpu_to_le16(UNI_COLON); | |
726 | break; | |
727 | case '*': | |
728 | target[j] = cpu_to_le16(UNI_ASTERIK); | |
729 | break; | |
730 | case '?': | |
731 | target[j] = cpu_to_le16(UNI_QUESTION); | |
732 | break; | |
733 | case '<': | |
734 | target[j] = cpu_to_le16(UNI_LESSTHAN); | |
735 | break; | |
736 | case '>': | |
737 | target[j] = cpu_to_le16(UNI_GRTRTHAN); | |
738 | break; | |
739 | case '|': | |
740 | target[j] = cpu_to_le16(UNI_PIPE); | |
fb8c4b14 | 741 | break; |
6c91d362 SF |
742 | /* BB We can not handle remapping slash until |
743 | all the calls to build_path_from_dentry | |
744 | are modified, as they use slash as separator BB */ | |
745 | /* case '\\': | |
746 | target[j] = cpu_to_le16(UNI_SLASH); | |
747 | break;*/ | |
748 | default: | |
749 | charlen = cp->char2uni(source+i, | |
70ca734a | 750 | len_remaining, &temp); |
6c91d362 SF |
751 | /* if no match, use question mark, which |
752 | at least in some cases servers as wild card */ | |
790fe579 | 753 | if (charlen < 1) { |
6c91d362 SF |
754 | target[j] = cpu_to_le16(0x003f); |
755 | charlen = 1; | |
70ca734a SF |
756 | } else |
757 | target[j] = cpu_to_le16(temp); | |
6c91d362 SF |
758 | len_remaining -= charlen; |
759 | /* character may take more than one byte in the | |
760 | the source string, but will take exactly two | |
761 | bytes in the target string */ | |
fb8c4b14 | 762 | i += charlen; |
6c91d362 SF |
763 | continue; |
764 | } | |
765 | i++; /* move to next char in source string */ | |
766 | len_remaining--; | |
767 | } | |
768 | ||
769 | ctoUCS_out: | |
770 | return i; | |
771 | } |