blob: 21a2c46334e1ae86cb4927f268514987469fcf2d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/misc.c
3 *
Steve French790fe572007-07-07 19:25:05 +00004 * Copyright (C) International Business Machines Corp., 2002,2007
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * 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
Steve Frenchfb8c4b12007-07-10 01:16:18 +000019 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
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"
Steve French6c91d362005-04-28 22:41:06 -070031#include "cifs_unicode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33extern mempool_t *cifs_sm_req_poolp;
34extern mempool_t *cifs_req_poolp;
Steve Frenchfb8c4b12007-07-10 01:16:18 +000035extern struct task_struct *oplockThread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Steve Frenchfb8c4b12007-07-10 01:16:18 +000037/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 since the cifs fs was mounted */
42
43unsigned int
44_GetXid(void)
45{
46 unsigned int xid;
47
48 spin_lock(&GlobalMid_Lock);
49 GlobalTotalActiveXid++;
Steve French50c2f752007-07-13 00:33:32 +000050
51 /* keep high water mark for number of simultaneous ops in filesystem */
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
Steve French50c2f752007-07-13 00:33:32 +000053 GlobalMaxActiveXid = GlobalTotalActiveXid;
Steve French790fe572007-07-07 19:25:05 +000054 if (GlobalTotalActiveXid > 65000)
Steve Frenchfb8c4b12007-07-10 01:16:18 +000055 cFYI(1, ("warning: more than 65000 requests active"));
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 xid = GlobalCurrentXid++;
57 spin_unlock(&GlobalMid_Lock);
58 return xid;
59}
60
61void
62_FreeXid(unsigned int xid)
63{
64 spin_lock(&GlobalMid_Lock);
Steve French790fe572007-07-07 19:25:05 +000065 /* if (GlobalTotalActiveXid == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 BUG(); */
67 GlobalTotalActiveXid--;
68 spin_unlock(&GlobalMid_Lock);
69}
70
71struct cifsSesInfo *
72sesInfoAlloc(void)
73{
74 struct cifsSesInfo *ret_buf;
75
Steve French76849e32007-01-21 22:56:22 +000076 ret_buf = kzalloc(sizeof (struct cifsSesInfo), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 write_lock(&GlobalSMBSeslock);
79 atomic_inc(&sesInfoAllocCount);
80 ret_buf->status = CifsNew;
81 list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);
82 init_MUTEX(&ret_buf->sesSem);
83 write_unlock(&GlobalSMBSeslock);
84 }
85 return ret_buf;
86}
87
88void
89sesInfoFree(struct cifsSesInfo *buf_to_free)
90{
91 if (buf_to_free == NULL) {
92 cFYI(1, ("Null buffer passed to sesInfoFree"));
93 return;
94 }
95
96 write_lock(&GlobalSMBSeslock);
97 atomic_dec(&sesInfoAllocCount);
98 list_del(&buf_to_free->cifsSessionList);
99 write_unlock(&GlobalSMBSeslock);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800100 kfree(buf_to_free->serverOS);
101 kfree(buf_to_free->serverDomain);
102 kfree(buf_to_free->serverNOS);
103 kfree(buf_to_free->password);
Steve French39798772006-05-31 22:40:51 +0000104 kfree(buf_to_free->domainName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 kfree(buf_to_free);
106}
107
108struct cifsTconInfo *
109tconInfoAlloc(void)
110{
111 struct cifsTconInfo *ret_buf;
Steve French76849e32007-01-21 22:56:22 +0000112 ret_buf = kzalloc(sizeof (struct cifsTconInfo), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 write_lock(&GlobalSMBSeslock);
115 atomic_inc(&tconInfoAllocCount);
116 list_add(&ret_buf->cifsConnectionList,
117 &GlobalTreeConnectionList);
118 ret_buf->tidStatus = CifsNew;
119 INIT_LIST_HEAD(&ret_buf->openFileList);
120 init_MUTEX(&ret_buf->tconSem);
121#ifdef CONFIG_CIFS_STATS
122 spin_lock_init(&ret_buf->stat_lock);
123#endif
124 write_unlock(&GlobalSMBSeslock);
125 }
126 return ret_buf;
127}
128
129void
130tconInfoFree(struct cifsTconInfo *buf_to_free)
131{
132 if (buf_to_free == NULL) {
133 cFYI(1, ("Null buffer passed to tconInfoFree"));
134 return;
135 }
136 write_lock(&GlobalSMBSeslock);
137 atomic_dec(&tconInfoAllocCount);
138 list_del(&buf_to_free->cifsConnectionList);
139 write_unlock(&GlobalSMBSeslock);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800140 kfree(buf_to_free->nativeFileSystem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 kfree(buf_to_free);
142}
143
144struct smb_hdr *
145cifs_buf_get(void)
146{
147 struct smb_hdr *ret_buf = NULL;
148
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000149/* We could use negotiated size instead of max_msgsize -
150 but it may be more efficient to always alloc same size
151 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 defaults to this and can not be bigger */
Steve French50c2f752007-07-13 00:33:32 +0000153 ret_buf = (struct smb_hdr *) mempool_alloc(cifs_req_poolp,
154 GFP_KERNEL | GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 /* clear the first few header bytes */
157 /* for most paths, more is cleared in header_assemble */
158 if (ret_buf) {
159 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
160 atomic_inc(&bufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800161#ifdef CONFIG_CIFS_STATS2
162 atomic_inc(&totBufAllocCount);
163#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 return ret_buf;
167}
168
169void
170cifs_buf_release(void *buf_to_free)
171{
172
173 if (buf_to_free == NULL) {
174 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
175 return;
176 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000177 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 atomic_dec(&bufAllocCount);
180 return;
181}
182
183struct smb_hdr *
184cifs_small_buf_get(void)
185{
186 struct smb_hdr *ret_buf = NULL;
187
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000188/* We could use negotiated size instead of max_msgsize -
189 but it may be more efficient to always alloc same size
190 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 defaults to this and can not be bigger */
Steve French50c2f752007-07-13 00:33:32 +0000192 ret_buf = (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp,
193 GFP_KERNEL | GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (ret_buf) {
195 /* No need to clear memory here, cleared in header assemble */
196 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
197 atomic_inc(&smBufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800198#ifdef CONFIG_CIFS_STATS2
199 atomic_inc(&totSmBufAllocCount);
200#endif /* CONFIG_CIFS_STATS2 */
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
203 return ret_buf;
204}
205
206void
207cifs_small_buf_release(void *buf_to_free)
208{
209
210 if (buf_to_free == NULL) {
211 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
212 return;
213 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000214 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 atomic_dec(&smBufAllocCount);
217 return;
218}
219
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000220/*
Steve French1982c342005-08-17 12:38:22 -0700221 Find a free multiplex id (SMB mid). Otherwise there could be
222 mid collisions which might cause problems, demultiplexing the
223 wrong response to this request. Multiplex ids could collide if
224 one of a series requests takes much longer than the others, or
225 if a very large number of long lived requests (byte range
226 locks or FindNotify requests) are pending. No more than
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000227 64K-1 requests can be outstanding at one time. If no
Steve French1982c342005-08-17 12:38:22 -0700228 mids are available, return zero. A future optimization
229 could make the combination of mids and uid the key we use
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000230 to demultiplex on (rather than mid alone).
Steve French1982c342005-08-17 12:38:22 -0700231 In addition to the above check, the cifs demultiplex
232 code already used the command code as a secondary
233 check of the frame and if signing is negotiated the
234 response would be discarded if the mid were the same
235 but the signature was wrong. Since the mid is not put in the
236 pending queue until later (when it is about to be dispatched)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000237 we do have to limit the number of outstanding requests
Steve French1982c342005-08-17 12:38:22 -0700238 to somewhat less than 64K-1 although it is hard to imagine
239 so many threads being in the vfs at one time.
240*/
241__u16 GetNextMid(struct TCP_Server_Info *server)
242{
243 __u16 mid = 0;
244 __u16 last_mid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000245 int collision;
Steve French1982c342005-08-17 12:38:22 -0700246
Steve French790fe572007-07-07 19:25:05 +0000247 if (server == NULL)
Steve French1982c342005-08-17 12:38:22 -0700248 return mid;
249
250 spin_lock(&GlobalMid_Lock);
251 last_mid = server->CurrentMid; /* we do not want to loop forever */
252 server->CurrentMid++;
253 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000254 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700255 fewer than 50, and the mids are likely to be unique
256 on the first pass through the loop unless some request
257 takes longer than the 64 thousand requests before it
258 (and it would also have to have been a request that
259 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000260 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700261 struct list_head *tmp;
262 struct mid_q_entry *mid_entry;
263
264 collision = 0;
Steve French790fe572007-07-07 19:25:05 +0000265 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700266 server->CurrentMid++;
267
268 list_for_each(tmp, &server->pending_mid_q) {
269 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
270
271 if ((mid_entry->mid == server->CurrentMid) &&
272 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {
273 /* This mid is in use, try a different one */
274 collision = 1;
275 break;
276 }
277 }
Steve French790fe572007-07-07 19:25:05 +0000278 if (collision == 0) {
Steve French1982c342005-08-17 12:38:22 -0700279 mid = server->CurrentMid;
280 break;
281 }
282 server->CurrentMid++;
283 }
284 spin_unlock(&GlobalMid_Lock);
285 return mid;
286}
287
288/* NB: MID can not be set if treeCon not passed in, in that
289 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290void
291header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
292 const struct cifsTconInfo *treeCon, int word_count
293 /* length of fixed section (word count) in two byte units */)
294{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000295 struct list_head *temp_item;
296 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 char *temp = (char *) buffer;
298
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000299 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 buffer->smb_buf_length =
302 (2 * word_count) + sizeof (struct smb_hdr) -
303 4 /* RFC 1001 length field does not count */ +
304 2 /* for bcc field itself */ ;
Steve French1982c342005-08-17 12:38:22 -0700305 /* Note that this is the only network field that has to be converted
306 to big endian and it is done just before we send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308 buffer->Protocol[0] = 0xFF;
309 buffer->Protocol[1] = 'S';
310 buffer->Protocol[2] = 'M';
311 buffer->Protocol[3] = 'B';
312 buffer->Command = smb_command;
313 buffer->Flags = 0x00; /* case sensitive */
314 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
315 buffer->Pid = cpu_to_le16((__u16)current->tgid);
316 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
317 spin_lock(&GlobalMid_Lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 spin_unlock(&GlobalMid_Lock);
319 if (treeCon) {
320 buffer->Tid = treeCon->tid;
321 if (treeCon->ses) {
322 if (treeCon->ses->capabilities & CAP_UNICODE)
323 buffer->Flags2 |= SMBFLG2_UNICODE;
324 if (treeCon->ses->capabilities & CAP_STATUS32) {
325 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
326 }
Steve French1982c342005-08-17 12:38:22 -0700327 /* Uid is not converted */
328 buffer->Uid = treeCon->ses->Suid;
329 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000330 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 /* For the multiuser case, there are few obvious technically */
332 /* possible mechanisms to match the local linux user (uid) */
333 /* to a valid remote smb user (smb_uid): */
334 /* 1) Query Winbind (or other local pam/nss daemon */
335 /* for userid/password/logon_domain or credential */
336 /* 2) Query Winbind for uid to sid to username mapping */
337 /* and see if we have a matching password for existing*/
338 /* session for that user perhas getting password by */
339 /* adding a new pam_cifs module that stores passwords */
340 /* so that the cifs vfs can get at that for all logged*/
341 /* on users */
342 /* 3) (Which is the mechanism we have chosen) */
343 /* Search through sessions to the same server for a */
344 /* a match on the uid that was passed in on mount */
345 /* with the current processes uid (or euid?) and use */
346 /* that smb uid. If no existing smb session for */
347 /* that uid found, use the default smb session ie */
348 /* the smb session for the volume mounted which is */
349 /* the same as would be used if the multiuser mount */
350 /* flag were disabled. */
351
352 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000353 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 /* for other target tcp/ip addresses BB */
Steve French790fe572007-07-07 19:25:05 +0000355 if (current->fsuid != treeCon->ses->linux_uid) {
Steve French83451872005-12-01 17:12:59 -0800356 cFYI(1,("Multiuser mode and UID did not match tcon uid"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 read_lock(&GlobalSMBSeslock);
358 list_for_each(temp_item, &GlobalSMBSessionList) {
359 ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
Steve French790fe572007-07-07 19:25:05 +0000360 if (ses->linux_uid == current->fsuid) {
361 if (ses->server == treeCon->ses->server) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000362 cFYI(1, ("found matching uid substitute right smb_uid"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 buffer->Uid = ses->Suid;
364 break;
365 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000366 /* BB eventually call cifs_setup_session here */
367 cFYI(1, ("local UID found but no smb sess with this server exists"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
369 }
370 }
371 read_unlock(&GlobalSMBSeslock);
372 }
373 }
374 }
375 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
376 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700377 if (treeCon->nocase)
378 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000379 if ((treeCon->ses) && (treeCon->ses->server))
380 if (treeCon->ses->server->secMode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
382 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
383 }
384
385/* endian conversion of flags is now done just before sending */
386 buffer->WordCount = (char) word_count;
387 return;
388}
389
Steve French2cd646a2006-09-28 19:43:08 +0000390static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391checkSMBhdr(struct smb_hdr *smb, __u16 mid)
392{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000393 /* Make sure that this really is an SMB, that it is a response,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 and that the message ids match */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000395 if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
396 (mid == smb->Mid)) {
Steve French790fe572007-07-07 19:25:05 +0000397 if (smb->Flags & SMBFLG_RESPONSE)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000398 return 0;
399 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 /* only one valid case where server sends us request */
Steve French790fe572007-07-07 19:25:05 +0000401 if (smb->Command == SMB_COM_LOCKING_ANDX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 return 0;
403 else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000404 cERROR(1, ("Received Request not response"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
406 } else { /* bad signature or mid */
407 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
408 cERROR(1,
Steve French6ab16d22005-11-29 20:55:11 -0800409 ("Bad protocol string signature header %x",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 *(unsigned int *) smb->Protocol));
411 if (mid != smb->Mid)
412 cERROR(1, ("Mids do not match"));
413 }
414 cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
415 return 1;
416}
417
418int
Steve Frenchd103e162006-10-12 17:49:24 +0000419checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Steve French70ca7342005-09-22 16:32:06 -0700421 __u32 len = smb->smb_buf_length;
Steve French190fdeb2005-10-10 11:48:26 -0700422 __u32 clc_len; /* calculated length */
Steve French184ed212006-02-24 06:15:11 +0000423 cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));
Steve Frenchd103e162006-10-12 17:49:24 +0000424
425 if (length < 2 + sizeof (struct smb_hdr)) {
426 if ((length >= sizeof (struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 && (smb->Status.CifsError != 0)) {
Steve Frenchd103e162006-10-12 17:49:24 +0000428 smb->WordCount = 0;
429 /* some error cases do not return wct and bcc */
430 return 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000431 } else if ((length == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000432 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000433 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000434 /* Need to work around a bug in two servers here */
435 /* First, check if the part of bcc they sent was zero */
436 if (tmp[sizeof(struct smb_hdr)] == 0) {
437 /* some servers return only half of bcc
438 * on simple responses (wct, bcc both zero)
439 * in particular have seen this on
440 * ulogoffX and FindClose. This leaves
441 * one byte of bcc potentially unitialized
442 */
443 /* zero rest of bcc */
444 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000445 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000447 cERROR(1, ("rcvd invalid byte count (bcc)"));
Steve Frenchd103e162006-10-12 17:49:24 +0000448 } else {
449 cERROR(1, ("Length less than smb header size"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
Steve Frenchd103e162006-10-12 17:49:24 +0000451 return 1;
452 }
453 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
454 cERROR(1, ("smb length greater than MaxBufSize, mid=%d",
Steve French184ed212006-02-24 06:15:11 +0000455 smb->Mid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return 1;
457 }
458
459 if (checkSMBhdr(smb, mid))
460 return 1;
Steve French190fdeb2005-10-10 11:48:26 -0700461 clc_len = smbCalcSize_LE(smb);
Steve French184ed212006-02-24 06:15:11 +0000462
Steve French790fe572007-07-07 19:25:05 +0000463 if (4 + len != length) {
Steve French184ed212006-02-24 06:15:11 +0000464 cERROR(1, ("Length read does not match RFC1001 length %d",len));
465 return 1;
466 }
467
468 if (4 + len != clc_len) {
469 /* check if bcc wrapped around for large read responses */
Steve French790fe572007-07-07 19:25:05 +0000470 if ((len > 64 * 1024) && (len > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000471 /* check if lengths match mod 64K */
Steve French790fe572007-07-07 19:25:05 +0000472 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000473 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000474 }
Steve French46c79a62006-03-02 00:07:08 +0000475 cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
476 clc_len, 4 + len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700477 /* Windows XP can return a few bytes too much, presumably
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000478 an illegal pad, at the end of byte range lock responses
Steve French6ab16d22005-11-29 20:55:11 -0800479 so we allow for that three byte pad, as long as actual
Steve French190fdeb2005-10-10 11:48:26 -0700480 received length is as long or longer than calculated length */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000481 /* We have now had to extend this more, since there is a
Steve French6ab16d22005-11-29 20:55:11 -0800482 case in which it needs to be bigger still to handle a
483 malformed response to transact2 findfirst from WinXP when
484 access denied is returned and thus bcc and wct are zero
485 but server says length is 0x21 bytes too long as if the server
486 forget to reset the smb rfc1001 length when it reset the
487 wct and bcc to minimum size and drop the t2 parms and data */
Steve French790fe572007-07-07 19:25:05 +0000488 if ((4+len > clc_len) && (len <= clc_len + 512))
Steve French190fdeb2005-10-10 11:48:26 -0700489 return 0;
Steve French46c79a62006-03-02 00:07:08 +0000490 else {
491 cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
492 len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700493 return 1;
Steve French46c79a62006-03-02 00:07:08 +0000494 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
Steve French20962432005-09-21 22:05:57 -0700496 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497}
498int
Steve Frenchd7c8c942006-03-03 10:43:49 +0000499is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000500{
501 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 struct list_head *tmp;
503 struct list_head *tmp1;
504 struct cifsTconInfo *tcon;
505 struct cifsFileInfo *netfile;
506
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000507 cFYI(1, ("Checking for oplock break or dnotify response"));
Steve French790fe572007-07-07 19:25:05 +0000508 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000510 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000512 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 __u32 data_offset = 0;
Steve French790fe572007-07-07 19:25:05 +0000514 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 data_offset = le32_to_cpu(pSMBr->DataOffset);
516
Steve French39798772006-05-31 22:40:51 +0000517 pnotify = (struct file_notify_information *)
518 ((char *)&pSMBr->hdr.Protocol + data_offset);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000519 cFYI(1,("dnotify on %s Action: 0x%x", pnotify->FileName,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 pnotify->Action)); /* BB removeme BB */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000521 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000522 sizeof(struct smb_hdr)+60); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 return TRUE;
524 }
Steve French790fe572007-07-07 19:25:05 +0000525 if (pSMBr->hdr.Status.CifsError) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000526 cFYI(1, ("notify err 0x%d",
527 pSMBr->hdr.Status.CifsError));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 return TRUE;
529 }
530 return FALSE;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000531 }
Steve French790fe572007-07-07 19:25:05 +0000532 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return FALSE;
Steve French790fe572007-07-07 19:25:05 +0000534 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 /* no sense logging error on invalid handle on oplock
536 break - harmless race between close request and oplock
537 break response is expected from time to time writing out
538 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000539 if ((NT_STATUS_INVALID_HANDLE) ==
540 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
541 cFYI(1, ("invalid handle on oplock break"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return TRUE;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000543 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000545 return TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 } else {
547 return FALSE; /* on valid oplock brk we get "request" */
548 }
549 }
Steve French790fe572007-07-07 19:25:05 +0000550 if (pSMB->hdr.WordCount != 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return FALSE;
552
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000553 cFYI(1, ("oplock type 0x%d level 0x%d",
554 pSMB->LockType, pSMB->OplockLevel));
Steve French790fe572007-07-07 19:25:05 +0000555 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000556 return FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 /* look up tcon based on tid & uid */
559 read_lock(&GlobalSMBSeslock);
560 list_for_each(tmp, &GlobalTreeConnectionList) {
561 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
Steve Frenchd7c8c942006-03-03 10:43:49 +0000562 if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {
Steve Frencha4544342005-08-24 13:59:35 -0700563 cifs_stats_inc(&tcon->num_oplock_brks);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000564 list_for_each(tmp1, &tcon->openFileList) {
565 netfile = list_entry(tmp1, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700566 tlist);
Steve French790fe572007-07-07 19:25:05 +0000567 if (pSMB->Fid == netfile->netfid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 struct cifsInodeInfo *pCifsInode;
569 read_unlock(&GlobalSMBSeslock);
Steve French57337e42005-04-28 22:41:10 -0700570 cFYI(1,("file id match, oplock break"));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000571 pCifsInode =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 CIFS_I(netfile->pInode);
573 pCifsInode->clientCanCacheAll = FALSE;
Steve French790fe572007-07-07 19:25:05 +0000574 if (pSMB->OplockLevel == 0)
Steve French57337e42005-04-28 22:41:10 -0700575 pCifsInode->clientCanCacheRead
576 = FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 pCifsInode->oplockPending = TRUE;
Steve French57337e42005-04-28 22:41:10 -0700578 AllocOplockQEntry(netfile->pInode,
579 netfile->netfid,
580 tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 cFYI(1,("about to wake up oplock thd"));
Steve French790fe572007-07-07 19:25:05 +0000582 if (oplockThread)
Steve French57337e42005-04-28 22:41:10 -0700583 wake_up_process(oplockThread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return TRUE;
585 }
586 }
587 read_unlock(&GlobalSMBSeslock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000588 cFYI(1, ("No matching file for oplock break"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 return TRUE;
590 }
591 }
592 read_unlock(&GlobalSMBSeslock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000593 cFYI(1, ("Can not process oplock break for non-existent connection"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 return TRUE;
595}
596
597void
598dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
599{
600 int i, j;
601 char debug_line[17];
602 unsigned char *buffer;
603
604 if (traceSMB == 0)
605 return;
606
607 buffer = (unsigned char *) smb_buf;
608 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve French57337e42005-04-28 22:41:10 -0700609 if (i % 8 == 0) { /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 printk(KERN_DEBUG "| ");
611 j = 0;
612 }
613 printk("%0#4x ", buffer[i]);
614 debug_line[2 * j] = ' ';
615 if (isprint(buffer[i]))
616 debug_line[1 + (2 * j)] = buffer[i];
617 else
618 debug_line[1 + (2 * j)] = '_';
619
Steve French57337e42005-04-28 22:41:10 -0700620 if (i % 8 == 7) { /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 debug_line[16] = 0;
622 printk(" | %s\n", debug_line);
623 }
624 }
625 for (; j < 8; j++) {
626 printk(" ");
627 debug_line[2 * j] = ' ';
628 debug_line[1 + (2 * j)] = ' ';
629 }
630 printk( " | %s\n", debug_line);
631 return;
632}
Steve French6a0b4822005-04-28 22:41:05 -0700633
Steve French6a0b4822005-04-28 22:41:05 -0700634/* Windows maps these to the user defined 16 bit Unicode range since they are
635 reserved symbols (along with \ and /), otherwise illegal to store
636 in filenames in NTFS */
Steve Frenchd0724712005-04-28 22:41:06 -0700637#define UNI_ASTERIK (__u16) ('*' + 0xF000)
638#define UNI_QUESTION (__u16) ('?' + 0xF000)
639#define UNI_COLON (__u16) (':' + 0xF000)
640#define UNI_GRTRTHAN (__u16) ('>' + 0xF000)
641#define UNI_LESSTHAN (__u16) ('<' + 0xF000)
642#define UNI_PIPE (__u16) ('|' + 0xF000)
643#define UNI_SLASH (__u16) ('\\' + 0xF000)
Steve French6a0b4822005-04-28 22:41:05 -0700644
645/* Convert 16 bit Unicode pathname from wire format to string in current code
646 page. Conversion may involve remapping up the seven characters that are
647 only legal in POSIX-like OS (if they are present in the string). Path
648 names are little endian 16 bit Unicode on the wire */
649int
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000650cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,
651 const struct nls_table *cp)
Steve French6a0b4822005-04-28 22:41:05 -0700652{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000653 int i, j, len;
Steve Frenchd0724712005-04-28 22:41:06 -0700654 __u16 src_char;
Steve French6a0b4822005-04-28 22:41:05 -0700655
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000656 for (i = 0, j = 0; i < maxlen; i++) {
Steve French6a0b4822005-04-28 22:41:05 -0700657 src_char = le16_to_cpu(source[i]);
658 switch (src_char) {
659 case 0:
660 goto cUCS_out; /* BB check this BB */
661 case UNI_COLON:
662 target[j] = ':';
663 break;
664 case UNI_ASTERIK:
665 target[j] = '*';
666 break;
667 case UNI_QUESTION:
668 target[j] = '?';
669 break;
Steve French6c91d362005-04-28 22:41:06 -0700670 /* BB We can not handle remapping slash until
671 all the calls to build_path_from_dentry
672 are modified, as they use slash as separator BB */
673 /* case UNI_SLASH:
674 target[j] = '\\';
675 break;*/
Steve French6a0b4822005-04-28 22:41:05 -0700676 case UNI_PIPE:
677 target[j] = '|';
678 break;
679 case UNI_GRTRTHAN:
680 target[j] = '>';
681 break;
682 case UNI_LESSTHAN:
683 target[j] = '<';
Steve French67594fe2005-05-17 13:04:49 -0500684 break;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000685 default:
686 len = cp->uni2char(src_char, &target[j],
Steve French6a0b4822005-04-28 22:41:05 -0700687 NLS_MAX_CHARSET_SIZE);
Steve French790fe572007-07-07 19:25:05 +0000688 if (len > 0) {
Steve French6a0b4822005-04-28 22:41:05 -0700689 j += len;
690 continue;
691 } else {
692 target[j] = '?';
693 }
694 }
695 j++;
Steve French57337e42005-04-28 22:41:10 -0700696 /* make sure we do not overrun callers allocated temp buffer */
Steve French790fe572007-07-07 19:25:05 +0000697 if (j >= (2 * NAME_MAX))
Steve French6a0b4822005-04-28 22:41:05 -0700698 break;
699 }
700cUCS_out:
701 target[j] = 0;
702 return j;
703}
Steve French6c91d362005-04-28 22:41:06 -0700704
705/* Convert 16 bit Unicode pathname to wire format from string in current code
706 page. Conversion may involve remapping up the seven characters that are
707 only legal in POSIX-like OS (if they are present in the string). Path
708 names are little endian 16 bit Unicode on the wire */
709int
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000710cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
711 const struct nls_table *cp, int mapChars)
Steve French6c91d362005-04-28 22:41:06 -0700712{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000713 int i, j, charlen;
Steve French6c91d362005-04-28 22:41:06 -0700714 int len_remaining = maxlen;
715 char src_char;
Steve French70ca7342005-09-22 16:32:06 -0700716 __u16 temp;
Steve French6c91d362005-04-28 22:41:06 -0700717
Steve French790fe572007-07-07 19:25:05 +0000718 if (!mapChars)
Steve Frenche89dc922005-11-11 15:18:19 -0800719 return cifs_strtoUCS(target, source, PATH_MAX, cp);
Steve French6c91d362005-04-28 22:41:06 -0700720
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000721 for (i = 0, j = 0; i < maxlen; j++) {
Steve French6c91d362005-04-28 22:41:06 -0700722 src_char = source[i];
723 switch (src_char) {
724 case 0:
Steve Frenchf4cfd692005-07-14 18:29:02 -0500725 target[j] = 0;
Steve French6c91d362005-04-28 22:41:06 -0700726 goto ctoUCS_out;
727 case ':':
728 target[j] = cpu_to_le16(UNI_COLON);
729 break;
730 case '*':
731 target[j] = cpu_to_le16(UNI_ASTERIK);
732 break;
733 case '?':
734 target[j] = cpu_to_le16(UNI_QUESTION);
735 break;
736 case '<':
737 target[j] = cpu_to_le16(UNI_LESSTHAN);
738 break;
739 case '>':
740 target[j] = cpu_to_le16(UNI_GRTRTHAN);
741 break;
742 case '|':
743 target[j] = cpu_to_le16(UNI_PIPE);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000744 break;
Steve French6c91d362005-04-28 22:41:06 -0700745 /* BB We can not handle remapping slash until
746 all the calls to build_path_from_dentry
747 are modified, as they use slash as separator BB */
748 /* case '\\':
749 target[j] = cpu_to_le16(UNI_SLASH);
750 break;*/
751 default:
752 charlen = cp->char2uni(source+i,
Steve French70ca7342005-09-22 16:32:06 -0700753 len_remaining, &temp);
Steve French6c91d362005-04-28 22:41:06 -0700754 /* if no match, use question mark, which
755 at least in some cases servers as wild card */
Steve French790fe572007-07-07 19:25:05 +0000756 if (charlen < 1) {
Steve French6c91d362005-04-28 22:41:06 -0700757 target[j] = cpu_to_le16(0x003f);
758 charlen = 1;
Steve French70ca7342005-09-22 16:32:06 -0700759 } else
760 target[j] = cpu_to_le16(temp);
Steve French6c91d362005-04-28 22:41:06 -0700761 len_remaining -= charlen;
762 /* character may take more than one byte in the
763 the source string, but will take exactly two
764 bytes in the target string */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000765 i += charlen;
Steve French6c91d362005-04-28 22:41:06 -0700766 continue;
767 }
768 i++; /* move to next char in source string */
769 len_remaining--;
770 }
771
772ctoUCS_out:
773 return i;
774}