blob: 1d69b8014e0bac116ab0f83220605db48e56ad20 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/misc.c
3 *
Steve Frenchad7a2922008-02-07 23:25:02 +00004 * Copyright (C) International Business Machines Corp., 2002,2008
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 French630f3f0c2007-10-25 21:17:17 +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 French630f3f0c2007-10-25 21:17:17 +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 French4498eed52005-12-03 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{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (buf_to_free == NULL) {
173 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
174 return;
175 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000176 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 atomic_dec(&bufAllocCount);
179 return;
180}
181
182struct smb_hdr *
183cifs_small_buf_get(void)
184{
185 struct smb_hdr *ret_buf = NULL;
186
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000187/* We could use negotiated size instead of max_msgsize -
188 but it may be more efficient to always alloc same size
189 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 defaults to this and can not be bigger */
Steve French50c2f752007-07-13 00:33:32 +0000191 ret_buf = (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp,
192 GFP_KERNEL | GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (ret_buf) {
194 /* No need to clear memory here, cleared in header assemble */
195 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
196 atomic_inc(&smBufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800197#ifdef CONFIG_CIFS_STATS2
198 atomic_inc(&totSmBufAllocCount);
199#endif /* CONFIG_CIFS_STATS2 */
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
202 return ret_buf;
203}
204
205void
206cifs_small_buf_release(void *buf_to_free)
207{
208
209 if (buf_to_free == NULL) {
210 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
211 return;
212 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000213 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 atomic_dec(&smBufAllocCount);
216 return;
217}
218
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000219/*
Steve French1982c342005-08-17 12:38:22 -0700220 Find a free multiplex id (SMB mid). Otherwise there could be
221 mid collisions which might cause problems, demultiplexing the
222 wrong response to this request. Multiplex ids could collide if
223 one of a series requests takes much longer than the others, or
224 if a very large number of long lived requests (byte range
225 locks or FindNotify requests) are pending. No more than
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000226 64K-1 requests can be outstanding at one time. If no
Steve French1982c342005-08-17 12:38:22 -0700227 mids are available, return zero. A future optimization
228 could make the combination of mids and uid the key we use
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000229 to demultiplex on (rather than mid alone).
Steve French1982c342005-08-17 12:38:22 -0700230 In addition to the above check, the cifs demultiplex
231 code already used the command code as a secondary
232 check of the frame and if signing is negotiated the
233 response would be discarded if the mid were the same
234 but the signature was wrong. Since the mid is not put in the
235 pending queue until later (when it is about to be dispatched)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000236 we do have to limit the number of outstanding requests
Steve French1982c342005-08-17 12:38:22 -0700237 to somewhat less than 64K-1 although it is hard to imagine
238 so many threads being in the vfs at one time.
239*/
240__u16 GetNextMid(struct TCP_Server_Info *server)
241{
242 __u16 mid = 0;
243 __u16 last_mid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000244 int collision;
Steve French1982c342005-08-17 12:38:22 -0700245
Steve French790fe572007-07-07 19:25:05 +0000246 if (server == NULL)
Steve French1982c342005-08-17 12:38:22 -0700247 return mid;
248
249 spin_lock(&GlobalMid_Lock);
250 last_mid = server->CurrentMid; /* we do not want to loop forever */
251 server->CurrentMid++;
252 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000253 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700254 fewer than 50, and the mids are likely to be unique
255 on the first pass through the loop unless some request
256 takes longer than the 64 thousand requests before it
257 (and it would also have to have been a request that
258 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000259 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700260 struct list_head *tmp;
261 struct mid_q_entry *mid_entry;
262
263 collision = 0;
Steve French790fe572007-07-07 19:25:05 +0000264 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700265 server->CurrentMid++;
266
267 list_for_each(tmp, &server->pending_mid_q) {
268 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
269
270 if ((mid_entry->mid == server->CurrentMid) &&
271 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {
272 /* This mid is in use, try a different one */
273 collision = 1;
274 break;
275 }
276 }
Steve French790fe572007-07-07 19:25:05 +0000277 if (collision == 0) {
Steve French1982c342005-08-17 12:38:22 -0700278 mid = server->CurrentMid;
279 break;
280 }
281 server->CurrentMid++;
282 }
283 spin_unlock(&GlobalMid_Lock);
284 return mid;
285}
286
287/* NB: MID can not be set if treeCon not passed in, in that
288 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289void
290header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
291 const struct cifsTconInfo *treeCon, int word_count
292 /* length of fixed section (word count) in two byte units */)
293{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000294 struct list_head *temp_item;
295 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 char *temp = (char *) buffer;
297
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000298 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 buffer->smb_buf_length =
Steve French630f3f0c2007-10-25 21:17:17 +0000301 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 4 /* RFC 1001 length field does not count */ +
303 2 /* for bcc field itself */ ;
Steve French1982c342005-08-17 12:38:22 -0700304 /* Note that this is the only network field that has to be converted
305 to big endian and it is done just before we send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 buffer->Protocol[0] = 0xFF;
308 buffer->Protocol[1] = 'S';
309 buffer->Protocol[2] = 'M';
310 buffer->Protocol[3] = 'B';
311 buffer->Command = smb_command;
312 buffer->Flags = 0x00; /* case sensitive */
313 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
314 buffer->Pid = cpu_to_le16((__u16)current->tgid);
315 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
316 spin_lock(&GlobalMid_Lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 spin_unlock(&GlobalMid_Lock);
318 if (treeCon) {
319 buffer->Tid = treeCon->tid;
320 if (treeCon->ses) {
321 if (treeCon->ses->capabilities & CAP_UNICODE)
322 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000323 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000325
Steve French1982c342005-08-17 12:38:22 -0700326 /* Uid is not converted */
327 buffer->Uid = treeCon->ses->Suid;
328 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000329 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 /* For the multiuser case, there are few obvious technically */
331 /* possible mechanisms to match the local linux user (uid) */
332 /* to a valid remote smb user (smb_uid): */
333 /* 1) Query Winbind (or other local pam/nss daemon */
334 /* for userid/password/logon_domain or credential */
335 /* 2) Query Winbind for uid to sid to username mapping */
336 /* and see if we have a matching password for existing*/
337 /* session for that user perhas getting password by */
338 /* adding a new pam_cifs module that stores passwords */
339 /* so that the cifs vfs can get at that for all logged*/
340 /* on users */
341 /* 3) (Which is the mechanism we have chosen) */
342 /* Search through sessions to the same server for a */
343 /* a match on the uid that was passed in on mount */
344 /* with the current processes uid (or euid?) and use */
345 /* that smb uid. If no existing smb session for */
346 /* that uid found, use the default smb session ie */
347 /* the smb session for the volume mounted which is */
348 /* the same as would be used if the multiuser mount */
349 /* flag were disabled. */
350
351 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000352 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 /* for other target tcp/ip addresses BB */
Steve French790fe572007-07-07 19:25:05 +0000354 if (current->fsuid != treeCon->ses->linux_uid) {
Steve French63135e02007-07-17 17:34:02 +0000355 cFYI(1, ("Multiuser mode and UID "
356 "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
Steve French630f3f0c2007-10-25 21:17:17 +0000425 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 French63135e02007-07-17 17:34:02 +0000464 cERROR(1, ("Length read does not match RFC1001 length %d",
465 len));
Steve French184ed212006-02-24 06:15:11 +0000466 return 1;
467 }
468
469 if (4 + len != clc_len) {
470 /* check if bcc wrapped around for large read responses */
Steve French790fe572007-07-07 19:25:05 +0000471 if ((len > 64 * 1024) && (len > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000472 /* check if lengths match mod 64K */
Steve French790fe572007-07-07 19:25:05 +0000473 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000474 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000475 }
Steve French46c79a62006-03-02 00:07:08 +0000476 cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
477 clc_len, 4 + len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700478 /* Windows XP can return a few bytes too much, presumably
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000479 an illegal pad, at the end of byte range lock responses
Steve French6ab16d22005-11-29 20:55:11 -0800480 so we allow for that three byte pad, as long as actual
Steve French190fdeb2005-10-10 11:48:26 -0700481 received length is as long or longer than calculated length */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000482 /* We have now had to extend this more, since there is a
Steve French6ab16d22005-11-29 20:55:11 -0800483 case in which it needs to be bigger still to handle a
484 malformed response to transact2 findfirst from WinXP when
485 access denied is returned and thus bcc and wct are zero
486 but server says length is 0x21 bytes too long as if the server
487 forget to reset the smb rfc1001 length when it reset the
488 wct and bcc to minimum size and drop the t2 parms and data */
Steve French790fe572007-07-07 19:25:05 +0000489 if ((4+len > clc_len) && (len <= clc_len + 512))
Steve French190fdeb2005-10-10 11:48:26 -0700490 return 0;
Steve French46c79a62006-03-02 00:07:08 +0000491 else {
492 cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
493 len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700494 return 1;
Steve French46c79a62006-03-02 00:07:08 +0000495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
Steve French20962432005-09-21 22:05:57 -0700497 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498}
Steve French4b18f2a2008-04-29 00:06:05 +0000499
500bool
Steve Frenchd7c8c942006-03-03 10:43:49 +0000501is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000502{
503 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 struct list_head *tmp;
505 struct list_head *tmp1;
506 struct cifsTconInfo *tcon;
507 struct cifsFileInfo *netfile;
508
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000509 cFYI(1, ("Checking for oplock break or dnotify response"));
Steve French790fe572007-07-07 19:25:05 +0000510 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000512 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000514 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 __u32 data_offset = 0;
Steve French790fe572007-07-07 19:25:05 +0000516 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 data_offset = le32_to_cpu(pSMBr->DataOffset);
518
Steve French39798772006-05-31 22:40:51 +0000519 pnotify = (struct file_notify_information *)
520 ((char *)&pSMBr->hdr.Protocol + data_offset);
Steve French63135e02007-07-17 17:34:02 +0000521 cFYI(1, ("dnotify on %s Action: 0x%x",
522 pnotify->FileName,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 pnotify->Action)); /* BB removeme BB */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000524 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000525 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000526 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
Steve French790fe572007-07-07 19:25:05 +0000528 if (pSMBr->hdr.Status.CifsError) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000529 cFYI(1, ("notify err 0x%d",
530 pSMBr->hdr.Status.CifsError));
Steve French4b18f2a2008-04-29 00:06:05 +0000531 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
Steve French4b18f2a2008-04-29 00:06:05 +0000533 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000534 }
Steve French790fe572007-07-07 19:25:05 +0000535 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000536 return false;
Steve French790fe572007-07-07 19:25:05 +0000537 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 /* no sense logging error on invalid handle on oplock
539 break - harmless race between close request and oplock
540 break response is expected from time to time writing out
541 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000542 if ((NT_STATUS_INVALID_HANDLE) ==
543 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
544 cFYI(1, ("invalid handle on oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000545 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000546 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000548 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000550 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 }
552 }
Steve French790fe572007-07-07 19:25:05 +0000553 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000554 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000556 cFYI(1, ("oplock type 0x%d level 0x%d",
557 pSMB->LockType, pSMB->OplockLevel));
Steve French790fe572007-07-07 19:25:05 +0000558 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000559 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561 /* look up tcon based on tid & uid */
562 read_lock(&GlobalSMBSeslock);
563 list_for_each(tmp, &GlobalTreeConnectionList) {
564 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
Steve Frenchd7c8c942006-03-03 10:43:49 +0000565 if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {
Steve Frencha4544342005-08-24 13:59:35 -0700566 cifs_stats_inc(&tcon->num_oplock_brks);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000567 list_for_each(tmp1, &tcon->openFileList) {
568 netfile = list_entry(tmp1, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700569 tlist);
Steve French790fe572007-07-07 19:25:05 +0000570 if (pSMB->Fid == netfile->netfid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 struct cifsInodeInfo *pCifsInode;
572 read_unlock(&GlobalSMBSeslock);
Steve French63135e02007-07-17 17:34:02 +0000573 cFYI(1,
574 ("file id match, oplock break"));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000575 pCifsInode =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 CIFS_I(netfile->pInode);
Steve French4b18f2a2008-04-29 00:06:05 +0000577 pCifsInode->clientCanCacheAll = false;
Steve French790fe572007-07-07 19:25:05 +0000578 if (pSMB->OplockLevel == 0)
Steve French57337e42005-04-28 22:41:10 -0700579 pCifsInode->clientCanCacheRead
Steve French4b18f2a2008-04-29 00:06:05 +0000580 = false;
581 pCifsInode->oplockPending = true;
Steve French57337e42005-04-28 22:41:10 -0700582 AllocOplockQEntry(netfile->pInode,
583 netfile->netfid,
584 tcon);
Steve French63135e02007-07-17 17:34:02 +0000585 cFYI(1,
586 ("about to wake up oplock thread"));
Steve French790fe572007-07-07 19:25:05 +0000587 if (oplockThread)
Steve French57337e42005-04-28 22:41:10 -0700588 wake_up_process(oplockThread);
Steve French4b18f2a2008-04-29 00:06:05 +0000589 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
591 }
592 read_unlock(&GlobalSMBSeslock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000593 cFYI(1, ("No matching file for oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000594 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
596 }
597 read_unlock(&GlobalSMBSeslock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000598 cFYI(1, ("Can not process oplock break for non-existent connection"));
Steve French4b18f2a2008-04-29 00:06:05 +0000599 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
602void
603dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
604{
605 int i, j;
606 char debug_line[17];
607 unsigned char *buffer;
608
609 if (traceSMB == 0)
610 return;
611
612 buffer = (unsigned char *) smb_buf;
613 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000614 if (i % 8 == 0) {
615 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 printk(KERN_DEBUG "| ");
617 j = 0;
618 }
619 printk("%0#4x ", buffer[i]);
620 debug_line[2 * j] = ' ';
621 if (isprint(buffer[i]))
622 debug_line[1 + (2 * j)] = buffer[i];
623 else
624 debug_line[1 + (2 * j)] = '_';
625
Steve Frenchad7a2922008-02-07 23:25:02 +0000626 if (i % 8 == 7) {
627 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 debug_line[16] = 0;
629 printk(" | %s\n", debug_line);
630 }
631 }
632 for (; j < 8; j++) {
633 printk(" ");
634 debug_line[2 * j] = ' ';
635 debug_line[1 + (2 * j)] = ' ';
636 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000637 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return;
639}
Steve French6a0b4822005-04-28 22:41:05 -0700640
Steve French6a0b4822005-04-28 22:41:05 -0700641/* Windows maps these to the user defined 16 bit Unicode range since they are
642 reserved symbols (along with \ and /), otherwise illegal to store
643 in filenames in NTFS */
Steve Frenchd0724712005-04-28 22:41:06 -0700644#define UNI_ASTERIK (__u16) ('*' + 0xF000)
645#define UNI_QUESTION (__u16) ('?' + 0xF000)
646#define UNI_COLON (__u16) (':' + 0xF000)
647#define UNI_GRTRTHAN (__u16) ('>' + 0xF000)
648#define UNI_LESSTHAN (__u16) ('<' + 0xF000)
649#define UNI_PIPE (__u16) ('|' + 0xF000)
650#define UNI_SLASH (__u16) ('\\' + 0xF000)
Steve French6a0b4822005-04-28 22:41:05 -0700651
652/* Convert 16 bit Unicode pathname from wire format to string in current code
653 page. Conversion may involve remapping up the seven characters that are
654 only legal in POSIX-like OS (if they are present in the string). Path
655 names are little endian 16 bit Unicode on the wire */
656int
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000657cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,
658 const struct nls_table *cp)
Steve French6a0b4822005-04-28 22:41:05 -0700659{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000660 int i, j, len;
Steve Frenchd0724712005-04-28 22:41:06 -0700661 __u16 src_char;
Steve French6a0b4822005-04-28 22:41:05 -0700662
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000663 for (i = 0, j = 0; i < maxlen; i++) {
Steve French6a0b4822005-04-28 22:41:05 -0700664 src_char = le16_to_cpu(source[i]);
665 switch (src_char) {
666 case 0:
667 goto cUCS_out; /* BB check this BB */
668 case UNI_COLON:
669 target[j] = ':';
670 break;
671 case UNI_ASTERIK:
672 target[j] = '*';
673 break;
674 case UNI_QUESTION:
675 target[j] = '?';
676 break;
Steve French6c91d362005-04-28 22:41:06 -0700677 /* BB We can not handle remapping slash until
678 all the calls to build_path_from_dentry
679 are modified, as they use slash as separator BB */
680 /* case UNI_SLASH:
681 target[j] = '\\';
682 break;*/
Steve French6a0b4822005-04-28 22:41:05 -0700683 case UNI_PIPE:
684 target[j] = '|';
685 break;
686 case UNI_GRTRTHAN:
687 target[j] = '>';
688 break;
689 case UNI_LESSTHAN:
690 target[j] = '<';
Steve French67594fe2005-05-17 13:04:49 -0500691 break;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000692 default:
693 len = cp->uni2char(src_char, &target[j],
Steve French6a0b4822005-04-28 22:41:05 -0700694 NLS_MAX_CHARSET_SIZE);
Steve French790fe572007-07-07 19:25:05 +0000695 if (len > 0) {
Steve French6a0b4822005-04-28 22:41:05 -0700696 j += len;
697 continue;
698 } else {
699 target[j] = '?';
700 }
701 }
702 j++;
Steve French57337e42005-04-28 22:41:10 -0700703 /* make sure we do not overrun callers allocated temp buffer */
Steve French790fe572007-07-07 19:25:05 +0000704 if (j >= (2 * NAME_MAX))
Steve French6a0b4822005-04-28 22:41:05 -0700705 break;
706 }
707cUCS_out:
708 target[j] = 0;
709 return j;
710}
Steve French6c91d362005-04-28 22:41:06 -0700711
712/* Convert 16 bit Unicode pathname to wire format from string in current code
713 page. Conversion may involve remapping up the seven characters that are
714 only legal in POSIX-like OS (if they are present in the string). Path
715 names are little endian 16 bit Unicode on the wire */
716int
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000717cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
718 const struct nls_table *cp, int mapChars)
Steve French6c91d362005-04-28 22:41:06 -0700719{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000720 int i, j, charlen;
Steve French6c91d362005-04-28 22:41:06 -0700721 int len_remaining = maxlen;
722 char src_char;
Steve French70ca7342005-09-22 16:32:06 -0700723 __u16 temp;
Steve French6c91d362005-04-28 22:41:06 -0700724
Steve French790fe572007-07-07 19:25:05 +0000725 if (!mapChars)
Steve Frenche89dc922005-11-11 15:18:19 -0800726 return cifs_strtoUCS(target, source, PATH_MAX, cp);
Steve French6c91d362005-04-28 22:41:06 -0700727
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000728 for (i = 0, j = 0; i < maxlen; j++) {
Steve French6c91d362005-04-28 22:41:06 -0700729 src_char = source[i];
730 switch (src_char) {
731 case 0:
Steve Frenchf4cfd692005-07-14 18:29:02 -0500732 target[j] = 0;
Steve French6c91d362005-04-28 22:41:06 -0700733 goto ctoUCS_out;
734 case ':':
735 target[j] = cpu_to_le16(UNI_COLON);
736 break;
737 case '*':
738 target[j] = cpu_to_le16(UNI_ASTERIK);
739 break;
740 case '?':
741 target[j] = cpu_to_le16(UNI_QUESTION);
742 break;
743 case '<':
744 target[j] = cpu_to_le16(UNI_LESSTHAN);
745 break;
746 case '>':
747 target[j] = cpu_to_le16(UNI_GRTRTHAN);
748 break;
749 case '|':
750 target[j] = cpu_to_le16(UNI_PIPE);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000751 break;
Steve French6c91d362005-04-28 22:41:06 -0700752 /* BB We can not handle remapping slash until
753 all the calls to build_path_from_dentry
754 are modified, as they use slash as separator BB */
755 /* case '\\':
756 target[j] = cpu_to_le16(UNI_SLASH);
757 break;*/
758 default:
759 charlen = cp->char2uni(source+i,
Steve French70ca7342005-09-22 16:32:06 -0700760 len_remaining, &temp);
Steve French6c91d362005-04-28 22:41:06 -0700761 /* if no match, use question mark, which
762 at least in some cases servers as wild card */
Steve French790fe572007-07-07 19:25:05 +0000763 if (charlen < 1) {
Steve French6c91d362005-04-28 22:41:06 -0700764 target[j] = cpu_to_le16(0x003f);
765 charlen = 1;
Steve French70ca7342005-09-22 16:32:06 -0700766 } else
767 target[j] = cpu_to_le16(temp);
Steve French6c91d362005-04-28 22:41:06 -0700768 len_remaining -= charlen;
769 /* character may take more than one byte in the
770 the source string, but will take exactly two
771 bytes in the target string */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000772 i += charlen;
Steve French6c91d362005-04-28 22:41:06 -0700773 continue;
774 }
775 i++; /* move to next char in source string */
776 len_remaining--;
777 }
778
779ctoUCS_out:
780 return i;
781}