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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; | |
1da177e4 | 35 | |
fb8c4b14 SF |
36 | /* The xid serves as a useful identifier for each incoming vfs request, |
37 | in a similar way to the mid which is useful to track each sent smb, | |
38 | and CurrentXid can also provide a running counter (although it | |
39 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
40 | since the cifs fs was mounted */ |
41 | ||
42 | unsigned int | |
43 | _GetXid(void) | |
44 | { | |
45 | unsigned int xid; | |
46 | ||
47 | spin_lock(&GlobalMid_Lock); | |
48 | GlobalTotalActiveXid++; | |
50c2f753 SF |
49 | |
50 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 51 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 52 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 53 | if (GlobalTotalActiveXid > 65000) |
b6b38f70 | 54 | cFYI(1, "warning: more than 65000 requests active"); |
1da177e4 LT |
55 | xid = GlobalCurrentXid++; |
56 | spin_unlock(&GlobalMid_Lock); | |
57 | return xid; | |
58 | } | |
59 | ||
60 | void | |
61 | _FreeXid(unsigned int xid) | |
62 | { | |
63 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 64 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
65 | BUG(); */ |
66 | GlobalTotalActiveXid--; | |
67 | spin_unlock(&GlobalMid_Lock); | |
68 | } | |
69 | ||
70 | struct cifsSesInfo * | |
71 | sesInfoAlloc(void) | |
72 | { | |
73 | struct cifsSesInfo *ret_buf; | |
74 | ||
630f3f0c | 75 | ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL); |
1da177e4 | 76 | if (ret_buf) { |
1da177e4 LT |
77 | atomic_inc(&sesInfoAllocCount); |
78 | ret_buf->status = CifsNew; | |
14fbf50d JL |
79 | ++ret_buf->ses_count; |
80 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 81 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 82 | mutex_init(&ret_buf->session_mutex); |
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) { | |
b6b38f70 | 91 | cFYI(1, "Null buffer passed to sesInfoFree"); |
1da177e4 LT |
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); | |
55162dec JL |
99 | if (buf_to_free->password) { |
100 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
101 | kfree(buf_to_free->password); | |
102 | } | |
3979877e | 103 | kfree(buf_to_free->domainName); |
1da177e4 LT |
104 | kfree(buf_to_free); |
105 | } | |
106 | ||
107 | struct cifsTconInfo * | |
108 | tconInfoAlloc(void) | |
109 | { | |
110 | struct cifsTconInfo *ret_buf; | |
630f3f0c | 111 | ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL); |
1da177e4 | 112 | if (ret_buf) { |
1da177e4 | 113 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 114 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 115 | ++ret_buf->tc_count; |
1da177e4 | 116 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 117 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
1da177e4 LT |
118 | #ifdef CONFIG_CIFS_STATS |
119 | spin_lock_init(&ret_buf->stat_lock); | |
120 | #endif | |
1da177e4 LT |
121 | } |
122 | return ret_buf; | |
123 | } | |
124 | ||
125 | void | |
126 | tconInfoFree(struct cifsTconInfo *buf_to_free) | |
127 | { | |
128 | if (buf_to_free == NULL) { | |
b6b38f70 | 129 | cFYI(1, "Null buffer passed to tconInfoFree"); |
1da177e4 LT |
130 | return; |
131 | } | |
1da177e4 | 132 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 133 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
134 | if (buf_to_free->password) { |
135 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
136 | kfree(buf_to_free->password); | |
137 | } | |
1da177e4 LT |
138 | kfree(buf_to_free); |
139 | } | |
140 | ||
141 | struct smb_hdr * | |
142 | cifs_buf_get(void) | |
143 | { | |
144 | struct smb_hdr *ret_buf = NULL; | |
145 | ||
fb8c4b14 SF |
146 | /* We could use negotiated size instead of max_msgsize - |
147 | but it may be more efficient to always alloc same size | |
148 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 149 | defaults to this and can not be bigger */ |
232087cb | 150 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
151 | |
152 | /* clear the first few header bytes */ | |
153 | /* for most paths, more is cleared in header_assemble */ | |
154 | if (ret_buf) { | |
155 | memset(ret_buf, 0, sizeof(struct smb_hdr) + 3); | |
156 | atomic_inc(&bufAllocCount); | |
4498eed5 SF |
157 | #ifdef CONFIG_CIFS_STATS2 |
158 | atomic_inc(&totBufAllocCount); | |
159 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
160 | } |
161 | ||
162 | return ret_buf; | |
163 | } | |
164 | ||
165 | void | |
166 | cifs_buf_release(void *buf_to_free) | |
167 | { | |
1da177e4 | 168 | if (buf_to_free == NULL) { |
b6b38f70 | 169 | /* cFYI(1, "Null buffer passed to cifs_buf_release");*/ |
1da177e4 LT |
170 | return; |
171 | } | |
fb8c4b14 | 172 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
173 | |
174 | atomic_dec(&bufAllocCount); | |
175 | return; | |
176 | } | |
177 | ||
178 | struct smb_hdr * | |
179 | cifs_small_buf_get(void) | |
180 | { | |
181 | struct smb_hdr *ret_buf = NULL; | |
182 | ||
fb8c4b14 SF |
183 | /* We could use negotiated size instead of max_msgsize - |
184 | but it may be more efficient to always alloc same size | |
185 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 186 | defaults to this and can not be bigger */ |
232087cb | 187 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
188 | if (ret_buf) { |
189 | /* No need to clear memory here, cleared in header assemble */ | |
190 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
191 | atomic_inc(&smBufAllocCount); | |
4498eed5 SF |
192 | #ifdef CONFIG_CIFS_STATS2 |
193 | atomic_inc(&totSmBufAllocCount); | |
194 | #endif /* CONFIG_CIFS_STATS2 */ | |
195 | ||
1da177e4 LT |
196 | } |
197 | return ret_buf; | |
198 | } | |
199 | ||
200 | void | |
201 | cifs_small_buf_release(void *buf_to_free) | |
202 | { | |
203 | ||
204 | if (buf_to_free == NULL) { | |
b6b38f70 | 205 | cFYI(1, "Null buffer passed to cifs_small_buf_release"); |
1da177e4 LT |
206 | return; |
207 | } | |
fb8c4b14 | 208 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
209 | |
210 | atomic_dec(&smBufAllocCount); | |
211 | return; | |
212 | } | |
213 | ||
fb8c4b14 | 214 | /* |
1982c344 SF |
215 | Find a free multiplex id (SMB mid). Otherwise there could be |
216 | mid collisions which might cause problems, demultiplexing the | |
217 | wrong response to this request. Multiplex ids could collide if | |
218 | one of a series requests takes much longer than the others, or | |
219 | if a very large number of long lived requests (byte range | |
220 | locks or FindNotify requests) are pending. No more than | |
fb8c4b14 | 221 | 64K-1 requests can be outstanding at one time. If no |
1982c344 SF |
222 | mids are available, return zero. A future optimization |
223 | could make the combination of mids and uid the key we use | |
fb8c4b14 | 224 | to demultiplex on (rather than mid alone). |
1982c344 SF |
225 | In addition to the above check, the cifs demultiplex |
226 | code already used the command code as a secondary | |
227 | check of the frame and if signing is negotiated the | |
228 | response would be discarded if the mid were the same | |
229 | but the signature was wrong. Since the mid is not put in the | |
230 | pending queue until later (when it is about to be dispatched) | |
fb8c4b14 | 231 | we do have to limit the number of outstanding requests |
1982c344 SF |
232 | to somewhat less than 64K-1 although it is hard to imagine |
233 | so many threads being in the vfs at one time. | |
234 | */ | |
235 | __u16 GetNextMid(struct TCP_Server_Info *server) | |
236 | { | |
237 | __u16 mid = 0; | |
238 | __u16 last_mid; | |
fb8c4b14 | 239 | int collision; |
1982c344 | 240 | |
790fe579 | 241 | if (server == NULL) |
1982c344 SF |
242 | return mid; |
243 | ||
244 | spin_lock(&GlobalMid_Lock); | |
245 | last_mid = server->CurrentMid; /* we do not want to loop forever */ | |
246 | server->CurrentMid++; | |
247 | /* This nested loop looks more expensive than it is. | |
fb8c4b14 | 248 | In practice the list of pending requests is short, |
1982c344 SF |
249 | fewer than 50, and the mids are likely to be unique |
250 | on the first pass through the loop unless some request | |
251 | takes longer than the 64 thousand requests before it | |
252 | (and it would also have to have been a request that | |
253 | did not time out) */ | |
fb8c4b14 | 254 | while (server->CurrentMid != last_mid) { |
1982c344 SF |
255 | struct list_head *tmp; |
256 | struct mid_q_entry *mid_entry; | |
257 | ||
258 | collision = 0; | |
790fe579 | 259 | if (server->CurrentMid == 0) |
1982c344 SF |
260 | server->CurrentMid++; |
261 | ||
262 | list_for_each(tmp, &server->pending_mid_q) { | |
263 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); | |
264 | ||
265 | if ((mid_entry->mid == server->CurrentMid) && | |
266 | (mid_entry->midState == MID_REQUEST_SUBMITTED)) { | |
267 | /* This mid is in use, try a different one */ | |
268 | collision = 1; | |
269 | break; | |
270 | } | |
271 | } | |
790fe579 | 272 | if (collision == 0) { |
1982c344 SF |
273 | mid = server->CurrentMid; |
274 | break; | |
275 | } | |
276 | server->CurrentMid++; | |
277 | } | |
278 | spin_unlock(&GlobalMid_Lock); | |
279 | return mid; | |
280 | } | |
281 | ||
282 | /* NB: MID can not be set if treeCon not passed in, in that | |
283 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
284 | void |
285 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
286 | const struct cifsTconInfo *treeCon, int word_count | |
287 | /* length of fixed section (word count) in two byte units */) | |
288 | { | |
fb8c4b14 SF |
289 | struct list_head *temp_item; |
290 | struct cifsSesInfo *ses; | |
1da177e4 LT |
291 | char *temp = (char *) buffer; |
292 | ||
fb8c4b14 | 293 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 LT |
294 | |
295 | buffer->smb_buf_length = | |
630f3f0c | 296 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 LT |
297 | 4 /* RFC 1001 length field does not count */ + |
298 | 2 /* for bcc field itself */ ; | |
1982c344 SF |
299 | /* Note that this is the only network field that has to be converted |
300 | to big endian and it is done just before we send it */ | |
1da177e4 LT |
301 | |
302 | buffer->Protocol[0] = 0xFF; | |
303 | buffer->Protocol[1] = 'S'; | |
304 | buffer->Protocol[2] = 'M'; | |
305 | buffer->Protocol[3] = 'B'; | |
306 | buffer->Command = smb_command; | |
307 | buffer->Flags = 0x00; /* case sensitive */ | |
308 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
309 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
310 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
311 | if (treeCon) { |
312 | buffer->Tid = treeCon->tid; | |
313 | if (treeCon->ses) { | |
314 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
315 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 316 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 317 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 318 | |
1982c344 SF |
319 | /* Uid is not converted */ |
320 | buffer->Uid = treeCon->ses->Suid; | |
321 | buffer->Mid = GetNextMid(treeCon->ses->server); | |
790fe579 | 322 | if (multiuser_mount != 0) { |
1da177e4 LT |
323 | /* For the multiuser case, there are few obvious technically */ |
324 | /* possible mechanisms to match the local linux user (uid) */ | |
325 | /* to a valid remote smb user (smb_uid): */ | |
326 | /* 1) Query Winbind (or other local pam/nss daemon */ | |
327 | /* for userid/password/logon_domain or credential */ | |
328 | /* 2) Query Winbind for uid to sid to username mapping */ | |
329 | /* and see if we have a matching password for existing*/ | |
330 | /* session for that user perhas getting password by */ | |
331 | /* adding a new pam_cifs module that stores passwords */ | |
332 | /* so that the cifs vfs can get at that for all logged*/ | |
333 | /* on users */ | |
334 | /* 3) (Which is the mechanism we have chosen) */ | |
335 | /* Search through sessions to the same server for a */ | |
336 | /* a match on the uid that was passed in on mount */ | |
337 | /* with the current processes uid (or euid?) and use */ | |
338 | /* that smb uid. If no existing smb session for */ | |
339 | /* that uid found, use the default smb session ie */ | |
340 | /* the smb session for the volume mounted which is */ | |
341 | /* the same as would be used if the multiuser mount */ | |
342 | /* flag were disabled. */ | |
343 | ||
344 | /* BB Add support for establishing new tCon and SMB Session */ | |
fb8c4b14 | 345 | /* with userid/password pairs found on the smb session */ |
1da177e4 | 346 | /* for other target tcp/ip addresses BB */ |
a001e5b5 | 347 | if (current_fsuid() != treeCon->ses->linux_uid) { |
b6b38f70 JP |
348 | cFYI(1, "Multiuser mode and UID " |
349 | "did not match tcon uid"); | |
14fbf50d JL |
350 | read_lock(&cifs_tcp_ses_lock); |
351 | list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) { | |
352 | ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list); | |
a001e5b5 | 353 | if (ses->linux_uid == current_fsuid()) { |
790fe579 | 354 | if (ses->server == treeCon->ses->server) { |
b6b38f70 | 355 | cFYI(1, "found matching uid substitute right smb_uid"); |
1da177e4 LT |
356 | buffer->Uid = ses->Suid; |
357 | break; | |
358 | } else { | |
fb8c4b14 | 359 | /* BB eventually call cifs_setup_session here */ |
b6b38f70 | 360 | cFYI(1, "local UID found but no smb sess with this server exists"); |
1da177e4 LT |
361 | } |
362 | } | |
363 | } | |
14fbf50d | 364 | read_unlock(&cifs_tcp_ses_lock); |
1da177e4 LT |
365 | } |
366 | } | |
367 | } | |
368 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
369 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
370 | if (treeCon->nocase) |
371 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 SF |
372 | if ((treeCon->ses) && (treeCon->ses->server)) |
373 | if (treeCon->ses->server->secMode & | |
1da177e4 LT |
374 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
375 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
376 | } | |
377 | ||
378 | /* endian conversion of flags is now done just before sending */ | |
379 | buffer->WordCount = (char) word_count; | |
380 | return; | |
381 | } | |
382 | ||
2cd646a2 | 383 | static int |
1da177e4 LT |
384 | checkSMBhdr(struct smb_hdr *smb, __u16 mid) |
385 | { | |
fb8c4b14 | 386 | /* Make sure that this really is an SMB, that it is a response, |
1da177e4 | 387 | and that the message ids match */ |
fb8c4b14 SF |
388 | if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) && |
389 | (mid == smb->Mid)) { | |
790fe579 | 390 | if (smb->Flags & SMBFLG_RESPONSE) |
fb8c4b14 SF |
391 | return 0; |
392 | else { | |
1da177e4 | 393 | /* only one valid case where server sends us request */ |
790fe579 | 394 | if (smb->Command == SMB_COM_LOCKING_ANDX) |
1da177e4 LT |
395 | return 0; |
396 | else | |
b6b38f70 | 397 | cERROR(1, "Received Request not response"); |
1da177e4 LT |
398 | } |
399 | } else { /* bad signature or mid */ | |
400 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) | |
b6b38f70 JP |
401 | cERROR(1, "Bad protocol string signature header %x", |
402 | *(unsigned int *) smb->Protocol); | |
1da177e4 | 403 | if (mid != smb->Mid) |
b6b38f70 | 404 | cERROR(1, "Mids do not match"); |
1da177e4 | 405 | } |
b6b38f70 | 406 | cERROR(1, "bad smb detected. The Mid=%d", smb->Mid); |
1da177e4 LT |
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 */ |
b6b38f70 | 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 | } |
b6b38f70 | 439 | cERROR(1, "rcvd invalid byte count (bcc)"); |
d103e164 | 440 | } else { |
b6b38f70 | 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) { | |
b6b38f70 JP |
446 | cERROR(1, "smb length greater than MaxBufSize, mid=%d", |
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) { |
b6b38f70 JP |
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 | } |
b6b38f70 JP |
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 | 483 | else { |
b6b38f70 JP |
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; | |
f1987b44 JL |
496 | struct list_head *tmp, *tmp1, *tmp2; |
497 | struct cifsSesInfo *ses; | |
1da177e4 | 498 | struct cifsTconInfo *tcon; |
f1987b44 | 499 | struct cifsInodeInfo *pCifsInode; |
1da177e4 | 500 | struct cifsFileInfo *netfile; |
3bc303c2 | 501 | int rc; |
1da177e4 | 502 | |
b6b38f70 | 503 | cFYI(1, "Checking for oplock break or dnotify response"); |
790fe579 | 504 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 505 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 506 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 507 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 508 | struct file_notify_information *pnotify; |
1da177e4 | 509 | __u32 data_offset = 0; |
790fe579 | 510 | if (pSMBr->ByteCount > sizeof(struct file_notify_information)) { |
1da177e4 LT |
511 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
512 | ||
3979877e SF |
513 | pnotify = (struct file_notify_information *) |
514 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
b6b38f70 JP |
515 | cFYI(1, "dnotify on %s Action: 0x%x", |
516 | pnotify->FileName, pnotify->Action); | |
fb8c4b14 | 517 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 518 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 519 | return true; |
1da177e4 | 520 | } |
790fe579 | 521 | if (pSMBr->hdr.Status.CifsError) { |
b6b38f70 JP |
522 | cFYI(1, "notify err 0x%d", |
523 | pSMBr->hdr.Status.CifsError); | |
4b18f2a9 | 524 | return true; |
1da177e4 | 525 | } |
4b18f2a9 | 526 | return false; |
fb8c4b14 | 527 | } |
790fe579 | 528 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 529 | return false; |
790fe579 | 530 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
531 | /* no sense logging error on invalid handle on oplock |
532 | break - harmless race between close request and oplock | |
533 | break response is expected from time to time writing out | |
534 | large dirty files cached on the client */ | |
fb8c4b14 SF |
535 | if ((NT_STATUS_INVALID_HANDLE) == |
536 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
b6b38f70 | 537 | cFYI(1, "invalid handle on oplock break"); |
4b18f2a9 | 538 | return true; |
fb8c4b14 | 539 | } else if (ERRbadfid == |
1da177e4 | 540 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 541 | return true; |
1da177e4 | 542 | } else { |
4b18f2a9 | 543 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
544 | } |
545 | } | |
790fe579 | 546 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 547 | return false; |
1da177e4 | 548 | |
b6b38f70 JP |
549 | cFYI(1, "oplock type 0x%d level 0x%d", |
550 | pSMB->LockType, pSMB->OplockLevel); | |
790fe579 | 551 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 552 | return false; |
1da177e4 LT |
553 | |
554 | /* look up tcon based on tid & uid */ | |
f1987b44 JL |
555 | read_lock(&cifs_tcp_ses_lock); |
556 | list_for_each(tmp, &srv->smb_ses_list) { | |
557 | ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list); | |
558 | list_for_each(tmp1, &ses->tcon_list) { | |
559 | tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list); | |
560 | if (tcon->tid != buf->Tid) | |
561 | continue; | |
562 | ||
a4544347 | 563 | cifs_stats_inc(&tcon->num_oplock_brks); |
058daf4f | 564 | read_lock(&GlobalSMBSeslock); |
f1987b44 JL |
565 | list_for_each(tmp2, &tcon->openFileList) { |
566 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 567 | tlist); |
f1987b44 JL |
568 | if (pSMB->Fid != netfile->netfid) |
569 | continue; | |
570 | ||
3bc303c2 JL |
571 | /* |
572 | * don't do anything if file is about to be | |
573 | * closed anyway. | |
574 | */ | |
575 | if (netfile->closePend) { | |
576 | read_unlock(&GlobalSMBSeslock); | |
577 | read_unlock(&cifs_tcp_ses_lock); | |
578 | return true; | |
579 | } | |
580 | ||
b6b38f70 | 581 | cFYI(1, "file id match, oplock break"); |
f1987b44 JL |
582 | pCifsInode = CIFS_I(netfile->pInode); |
583 | pCifsInode->clientCanCacheAll = false; | |
584 | if (pSMB->OplockLevel == 0) | |
585 | pCifsInode->clientCanCacheRead = false; | |
3bc303c2 JL |
586 | rc = slow_work_enqueue(&netfile->oplock_break); |
587 | if (rc) { | |
b6b38f70 JP |
588 | cERROR(1, "failed to enqueue oplock " |
589 | "break: %d\n", rc); | |
3bc303c2 JL |
590 | } else { |
591 | netfile->oplock_break_cancelled = false; | |
592 | } | |
593 | read_unlock(&GlobalSMBSeslock); | |
594 | read_unlock(&cifs_tcp_ses_lock); | |
f1987b44 | 595 | return true; |
1da177e4 | 596 | } |
058daf4f | 597 | read_unlock(&GlobalSMBSeslock); |
f1987b44 | 598 | read_unlock(&cifs_tcp_ses_lock); |
b6b38f70 | 599 | cFYI(1, "No matching file for oplock break"); |
4b18f2a9 | 600 | return true; |
1da177e4 LT |
601 | } |
602 | } | |
f1987b44 | 603 | read_unlock(&cifs_tcp_ses_lock); |
b6b38f70 | 604 | cFYI(1, "Can not process oplock break for non-existent connection"); |
4b18f2a9 | 605 | return true; |
1da177e4 LT |
606 | } |
607 | ||
608 | void | |
609 | dump_smb(struct smb_hdr *smb_buf, int smb_buf_length) | |
610 | { | |
611 | int i, j; | |
612 | char debug_line[17]; | |
613 | unsigned char *buffer; | |
614 | ||
615 | if (traceSMB == 0) | |
616 | return; | |
617 | ||
618 | buffer = (unsigned char *) smb_buf; | |
619 | for (i = 0, j = 0; i < smb_buf_length; i++, j++) { | |
ad7a2926 SF |
620 | if (i % 8 == 0) { |
621 | /* have reached the beginning of line */ | |
1da177e4 LT |
622 | printk(KERN_DEBUG "| "); |
623 | j = 0; | |
624 | } | |
625 | printk("%0#4x ", buffer[i]); | |
626 | debug_line[2 * j] = ' '; | |
627 | if (isprint(buffer[i])) | |
628 | debug_line[1 + (2 * j)] = buffer[i]; | |
629 | else | |
630 | debug_line[1 + (2 * j)] = '_'; | |
631 | ||
ad7a2926 SF |
632 | if (i % 8 == 7) { |
633 | /* reached end of line, time to print ascii */ | |
1da177e4 LT |
634 | debug_line[16] = 0; |
635 | printk(" | %s\n", debug_line); | |
636 | } | |
637 | } | |
638 | for (; j < 8; j++) { | |
639 | printk(" "); | |
640 | debug_line[2 * j] = ' '; | |
641 | debug_line[1 + (2 * j)] = ' '; | |
642 | } | |
ad7a2926 | 643 | printk(" | %s\n", debug_line); |
1da177e4 LT |
644 | return; |
645 | } | |
6a0b4824 | 646 | |
6c91d362 SF |
647 | /* Convert 16 bit Unicode pathname to wire format from string in current code |
648 | page. Conversion may involve remapping up the seven characters that are | |
649 | only legal in POSIX-like OS (if they are present in the string). Path | |
650 | names are little endian 16 bit Unicode on the wire */ | |
651 | int | |
fb8c4b14 SF |
652 | cifsConvertToUCS(__le16 *target, const char *source, int maxlen, |
653 | const struct nls_table *cp, int mapChars) | |
6c91d362 | 654 | { |
fb8c4b14 | 655 | int i, j, charlen; |
6c91d362 SF |
656 | int len_remaining = maxlen; |
657 | char src_char; | |
70ca734a | 658 | __u16 temp; |
6c91d362 | 659 | |
790fe579 | 660 | if (!mapChars) |
e89dc920 | 661 | return cifs_strtoUCS(target, source, PATH_MAX, cp); |
6c91d362 | 662 | |
fb8c4b14 | 663 | for (i = 0, j = 0; i < maxlen; j++) { |
6c91d362 SF |
664 | src_char = source[i]; |
665 | switch (src_char) { | |
666 | case 0: | |
f4cfd69c | 667 | target[j] = 0; |
6c91d362 SF |
668 | goto ctoUCS_out; |
669 | case ':': | |
670 | target[j] = cpu_to_le16(UNI_COLON); | |
671 | break; | |
672 | case '*': | |
673 | target[j] = cpu_to_le16(UNI_ASTERIK); | |
674 | break; | |
675 | case '?': | |
676 | target[j] = cpu_to_le16(UNI_QUESTION); | |
677 | break; | |
678 | case '<': | |
679 | target[j] = cpu_to_le16(UNI_LESSTHAN); | |
680 | break; | |
681 | case '>': | |
682 | target[j] = cpu_to_le16(UNI_GRTRTHAN); | |
683 | break; | |
684 | case '|': | |
685 | target[j] = cpu_to_le16(UNI_PIPE); | |
fb8c4b14 | 686 | break; |
6c91d362 SF |
687 | /* BB We can not handle remapping slash until |
688 | all the calls to build_path_from_dentry | |
689 | are modified, as they use slash as separator BB */ | |
690 | /* case '\\': | |
691 | target[j] = cpu_to_le16(UNI_SLASH); | |
692 | break;*/ | |
693 | default: | |
694 | charlen = cp->char2uni(source+i, | |
70ca734a | 695 | len_remaining, &temp); |
6c91d362 SF |
696 | /* if no match, use question mark, which |
697 | at least in some cases servers as wild card */ | |
790fe579 | 698 | if (charlen < 1) { |
6c91d362 SF |
699 | target[j] = cpu_to_le16(0x003f); |
700 | charlen = 1; | |
70ca734a SF |
701 | } else |
702 | target[j] = cpu_to_le16(temp); | |
6c91d362 SF |
703 | len_remaining -= charlen; |
704 | /* character may take more than one byte in the | |
705 | the source string, but will take exactly two | |
706 | bytes in the target string */ | |
fb8c4b14 | 707 | i += charlen; |
6c91d362 SF |
708 | continue; |
709 | } | |
710 | i++; /* move to next char in source string */ | |
711 | len_remaining--; | |
712 | } | |
713 | ||
714 | ctoUCS_out: | |
715 | return i; | |
716 | } | |
ec06aedd JL |
717 | |
718 | void | |
719 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
720 | { | |
721 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 722 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
b6b38f70 | 723 | cERROR(1, "Autodisabling the use of server inode numbers on " |
ec06aedd JL |
724 | "%s. This server doesn't seem to support them " |
725 | "properly. Hardlinks will not be recognized on this " | |
726 | "mount. Consider mounting with the \"noserverino\" " | |
727 | "option to silence this message.", | |
b6b38f70 | 728 | cifs_sb->tcon->treeName); |
ec06aedd JL |
729 | } |
730 | } |