blob: 191e6220bc76369eb87757ecc2ba316870a9296b [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 French630f3f02007-10-25 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 atomic_inc(&sesInfoAllocCount);
79 ret_buf->status = CifsNew;
Jeff Layton14fbf502008-11-14 13:53:46 -050080 ++ret_buf->ses_count;
81 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -050082 INIT_LIST_HEAD(&ret_buf->tcon_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 init_MUTEX(&ret_buf->sesSem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 }
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 atomic_dec(&sesInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -080097 kfree(buf_to_free->serverOS);
98 kfree(buf_to_free->serverDomain);
99 kfree(buf_to_free->serverNOS);
Jeff Layton55162de2008-12-05 20:41:21 -0500100 if (buf_to_free->password) {
101 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
102 kfree(buf_to_free->password);
103 }
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 French630f3f02007-10-25 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 atomic_inc(&tconInfoAllocCount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 ret_buf->tidStatus = CifsNew;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500116 ++ret_buf->tc_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 INIT_LIST_HEAD(&ret_buf->openFileList);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500118 INIT_LIST_HEAD(&ret_buf->tcon_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#ifdef CONFIG_CIFS_STATS
120 spin_lock_init(&ret_buf->stat_lock);
121#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
123 return ret_buf;
124}
125
126void
127tconInfoFree(struct cifsTconInfo *buf_to_free)
128{
129 if (buf_to_free == NULL) {
130 cFYI(1, ("Null buffer passed to tconInfoFree"));
131 return;
132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 atomic_dec(&tconInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800134 kfree(buf_to_free->nativeFileSystem);
Jeff Layton00e485b2008-12-05 20:41:21 -0500135 if (buf_to_free->password) {
136 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
137 kfree(buf_to_free->password);
138 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 kfree(buf_to_free);
140}
141
142struct smb_hdr *
143cifs_buf_get(void)
144{
145 struct smb_hdr *ret_buf = NULL;
146
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000147/* We could use negotiated size instead of max_msgsize -
148 but it may be more efficient to always alloc same size
149 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300151 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 /* clear the first few header bytes */
154 /* for most paths, more is cleared in header_assemble */
155 if (ret_buf) {
156 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
157 atomic_inc(&bufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800158#ifdef CONFIG_CIFS_STATS2
159 atomic_inc(&totBufAllocCount);
160#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 }
162
163 return ret_buf;
164}
165
166void
167cifs_buf_release(void *buf_to_free)
168{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (buf_to_free == NULL) {
170 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
171 return;
172 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000173 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 atomic_dec(&bufAllocCount);
176 return;
177}
178
179struct smb_hdr *
180cifs_small_buf_get(void)
181{
182 struct smb_hdr *ret_buf = NULL;
183
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000184/* We could use negotiated size instead of max_msgsize -
185 but it may be more efficient to always alloc same size
186 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300188 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (ret_buf) {
190 /* No need to clear memory here, cleared in header assemble */
191 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
192 atomic_inc(&smBufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800193#ifdef CONFIG_CIFS_STATS2
194 atomic_inc(&totSmBufAllocCount);
195#endif /* CONFIG_CIFS_STATS2 */
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 }
198 return ret_buf;
199}
200
201void
202cifs_small_buf_release(void *buf_to_free)
203{
204
205 if (buf_to_free == NULL) {
206 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
207 return;
208 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000209 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 atomic_dec(&smBufAllocCount);
212 return;
213}
214
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000215/*
Steve French1982c342005-08-17 12:38:22 -0700216 Find a free multiplex id (SMB mid). Otherwise there could be
217 mid collisions which might cause problems, demultiplexing the
218 wrong response to this request. Multiplex ids could collide if
219 one of a series requests takes much longer than the others, or
220 if a very large number of long lived requests (byte range
221 locks or FindNotify requests) are pending. No more than
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000222 64K-1 requests can be outstanding at one time. If no
Steve French1982c342005-08-17 12:38:22 -0700223 mids are available, return zero. A future optimization
224 could make the combination of mids and uid the key we use
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000225 to demultiplex on (rather than mid alone).
Steve French1982c342005-08-17 12:38:22 -0700226 In addition to the above check, the cifs demultiplex
227 code already used the command code as a secondary
228 check of the frame and if signing is negotiated the
229 response would be discarded if the mid were the same
230 but the signature was wrong. Since the mid is not put in the
231 pending queue until later (when it is about to be dispatched)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000232 we do have to limit the number of outstanding requests
Steve French1982c342005-08-17 12:38:22 -0700233 to somewhat less than 64K-1 although it is hard to imagine
234 so many threads being in the vfs at one time.
235*/
236__u16 GetNextMid(struct TCP_Server_Info *server)
237{
238 __u16 mid = 0;
239 __u16 last_mid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000240 int collision;
Steve French1982c342005-08-17 12:38:22 -0700241
Steve French790fe572007-07-07 19:25:05 +0000242 if (server == NULL)
Steve French1982c342005-08-17 12:38:22 -0700243 return mid;
244
245 spin_lock(&GlobalMid_Lock);
246 last_mid = server->CurrentMid; /* we do not want to loop forever */
247 server->CurrentMid++;
248 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000249 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700250 fewer than 50, and the mids are likely to be unique
251 on the first pass through the loop unless some request
252 takes longer than the 64 thousand requests before it
253 (and it would also have to have been a request that
254 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000255 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700256 struct list_head *tmp;
257 struct mid_q_entry *mid_entry;
258
259 collision = 0;
Steve French790fe572007-07-07 19:25:05 +0000260 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700261 server->CurrentMid++;
262
263 list_for_each(tmp, &server->pending_mid_q) {
264 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
265
266 if ((mid_entry->mid == server->CurrentMid) &&
267 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {
268 /* This mid is in use, try a different one */
269 collision = 1;
270 break;
271 }
272 }
Steve French790fe572007-07-07 19:25:05 +0000273 if (collision == 0) {
Steve French1982c342005-08-17 12:38:22 -0700274 mid = server->CurrentMid;
275 break;
276 }
277 server->CurrentMid++;
278 }
279 spin_unlock(&GlobalMid_Lock);
280 return mid;
281}
282
283/* NB: MID can not be set if treeCon not passed in, in that
284 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285void
286header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
287 const struct cifsTconInfo *treeCon, int word_count
288 /* length of fixed section (word count) in two byte units */)
289{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000290 struct list_head *temp_item;
291 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 char *temp = (char *) buffer;
293
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000294 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 buffer->smb_buf_length =
Steve French630f3f02007-10-25 21:17:17 +0000297 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 4 /* RFC 1001 length field does not count */ +
299 2 /* for bcc field itself */ ;
Steve French1982c342005-08-17 12:38:22 -0700300 /* Note that this is the only network field that has to be converted
301 to big endian and it is done just before we send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 buffer->Protocol[0] = 0xFF;
304 buffer->Protocol[1] = 'S';
305 buffer->Protocol[2] = 'M';
306 buffer->Protocol[3] = 'B';
307 buffer->Command = smb_command;
308 buffer->Flags = 0x00; /* case sensitive */
309 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
310 buffer->Pid = cpu_to_le16((__u16)current->tgid);
311 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (treeCon) {
313 buffer->Tid = treeCon->tid;
314 if (treeCon->ses) {
315 if (treeCon->ses->capabilities & CAP_UNICODE)
316 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000317 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000319
Steve French1982c342005-08-17 12:38:22 -0700320 /* Uid is not converted */
321 buffer->Uid = treeCon->ses->Suid;
322 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000323 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 /* For the multiuser case, there are few obvious technically */
325 /* possible mechanisms to match the local linux user (uid) */
326 /* to a valid remote smb user (smb_uid): */
327 /* 1) Query Winbind (or other local pam/nss daemon */
328 /* for userid/password/logon_domain or credential */
329 /* 2) Query Winbind for uid to sid to username mapping */
330 /* and see if we have a matching password for existing*/
331 /* session for that user perhas getting password by */
332 /* adding a new pam_cifs module that stores passwords */
333 /* so that the cifs vfs can get at that for all logged*/
334 /* on users */
335 /* 3) (Which is the mechanism we have chosen) */
336 /* Search through sessions to the same server for a */
337 /* a match on the uid that was passed in on mount */
338 /* with the current processes uid (or euid?) and use */
339 /* that smb uid. If no existing smb session for */
340 /* that uid found, use the default smb session ie */
341 /* the smb session for the volume mounted which is */
342 /* the same as would be used if the multiuser mount */
343 /* flag were disabled. */
344
345 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000346 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 /* for other target tcp/ip addresses BB */
David Howellsa001e5b2008-11-14 10:38:47 +1100348 if (current_fsuid() != treeCon->ses->linux_uid) {
Steve French63135e02007-07-17 17:34:02 +0000349 cFYI(1, ("Multiuser mode and UID "
350 "did not match tcon uid"));
Jeff Layton14fbf502008-11-14 13:53:46 -0500351 read_lock(&cifs_tcp_ses_lock);
352 list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
353 ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list);
David Howellsa001e5b2008-11-14 10:38:47 +1100354 if (ses->linux_uid == current_fsuid()) {
Steve French790fe572007-07-07 19:25:05 +0000355 if (ses->server == treeCon->ses->server) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000356 cFYI(1, ("found matching uid substitute right smb_uid"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 buffer->Uid = ses->Suid;
358 break;
359 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000360 /* BB eventually call cifs_setup_session here */
361 cFYI(1, ("local UID found but no smb sess with this server exists"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363 }
364 }
Jeff Layton14fbf502008-11-14 13:53:46 -0500365 read_unlock(&cifs_tcp_ses_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
367 }
368 }
369 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
370 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700371 if (treeCon->nocase)
372 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000373 if ((treeCon->ses) && (treeCon->ses->server))
374 if (treeCon->ses->server->secMode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
376 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
377 }
378
379/* endian conversion of flags is now done just before sending */
380 buffer->WordCount = (char) word_count;
381 return;
382}
383
Steve French2cd646a2006-09-28 19:43:08 +0000384static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385checkSMBhdr(struct smb_hdr *smb, __u16 mid)
386{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000387 /* Make sure that this really is an SMB, that it is a response,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 and that the message ids match */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000389 if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
390 (mid == smb->Mid)) {
Steve French790fe572007-07-07 19:25:05 +0000391 if (smb->Flags & SMBFLG_RESPONSE)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000392 return 0;
393 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* only one valid case where server sends us request */
Steve French790fe572007-07-07 19:25:05 +0000395 if (smb->Command == SMB_COM_LOCKING_ANDX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return 0;
397 else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000398 cERROR(1, ("Received Request not response"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400 } else { /* bad signature or mid */
401 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
402 cERROR(1,
Steve French6ab16d22005-11-29 20:55:11 -0800403 ("Bad protocol string signature header %x",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 *(unsigned int *) smb->Protocol));
405 if (mid != smb->Mid)
406 cERROR(1, ("Mids do not match"));
407 }
408 cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
409 return 1;
410}
411
412int
Steve Frenchd103e162006-10-12 17:49:24 +0000413checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
Steve French70ca7342005-09-22 16:32:06 -0700415 __u32 len = smb->smb_buf_length;
Steve French190fdeb2005-10-10 11:48:26 -0700416 __u32 clc_len; /* calculated length */
Steve French184ed212006-02-24 06:15:11 +0000417 cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));
Steve Frenchd103e162006-10-12 17:49:24 +0000418
Steve French630f3f02007-10-25 21:17:17 +0000419 if (length < 2 + sizeof(struct smb_hdr)) {
420 if ((length >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 && (smb->Status.CifsError != 0)) {
Steve Frenchd103e162006-10-12 17:49:24 +0000422 smb->WordCount = 0;
423 /* some error cases do not return wct and bcc */
424 return 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000425 } else if ((length == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000426 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000427 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000428 /* Need to work around a bug in two servers here */
429 /* First, check if the part of bcc they sent was zero */
430 if (tmp[sizeof(struct smb_hdr)] == 0) {
431 /* some servers return only half of bcc
432 * on simple responses (wct, bcc both zero)
433 * in particular have seen this on
434 * ulogoffX and FindClose. This leaves
435 * one byte of bcc potentially unitialized
436 */
437 /* zero rest of bcc */
438 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000439 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000441 cERROR(1, ("rcvd invalid byte count (bcc)"));
Steve Frenchd103e162006-10-12 17:49:24 +0000442 } else {
443 cERROR(1, ("Length less than smb header size"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 }
Steve Frenchd103e162006-10-12 17:49:24 +0000445 return 1;
446 }
447 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
448 cERROR(1, ("smb length greater than MaxBufSize, mid=%d",
Steve French184ed212006-02-24 06:15:11 +0000449 smb->Mid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return 1;
451 }
452
453 if (checkSMBhdr(smb, mid))
454 return 1;
Steve French190fdeb2005-10-10 11:48:26 -0700455 clc_len = smbCalcSize_LE(smb);
Steve French184ed212006-02-24 06:15:11 +0000456
Steve French790fe572007-07-07 19:25:05 +0000457 if (4 + len != length) {
Steve French63135e02007-07-17 17:34:02 +0000458 cERROR(1, ("Length read does not match RFC1001 length %d",
459 len));
Steve French184ed212006-02-24 06:15:11 +0000460 return 1;
461 }
462
463 if (4 + len != clc_len) {
464 /* check if bcc wrapped around for large read responses */
Steve French790fe572007-07-07 19:25:05 +0000465 if ((len > 64 * 1024) && (len > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000466 /* check if lengths match mod 64K */
Steve French790fe572007-07-07 19:25:05 +0000467 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000468 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000469 }
Steve French46c79a62006-03-02 00:07:08 +0000470 cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
471 clc_len, 4 + len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700472 /* Windows XP can return a few bytes too much, presumably
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000473 an illegal pad, at the end of byte range lock responses
Steve French6ab16d22005-11-29 20:55:11 -0800474 so we allow for that three byte pad, as long as actual
Steve French190fdeb2005-10-10 11:48:26 -0700475 received length is as long or longer than calculated length */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000476 /* We have now had to extend this more, since there is a
Steve French6ab16d22005-11-29 20:55:11 -0800477 case in which it needs to be bigger still to handle a
478 malformed response to transact2 findfirst from WinXP when
479 access denied is returned and thus bcc and wct are zero
480 but server says length is 0x21 bytes too long as if the server
481 forget to reset the smb rfc1001 length when it reset the
482 wct and bcc to minimum size and drop the t2 parms and data */
Steve French790fe572007-07-07 19:25:05 +0000483 if ((4+len > clc_len) && (len <= clc_len + 512))
Steve French190fdeb2005-10-10 11:48:26 -0700484 return 0;
Steve French46c79a62006-03-02 00:07:08 +0000485 else {
486 cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
487 len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700488 return 1;
Steve French46c79a62006-03-02 00:07:08 +0000489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
Steve French20962432005-09-21 22:05:57 -0700491 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492}
Steve French4b18f2a2008-04-29 00:06:05 +0000493
494bool
Steve Frenchd7c8c942006-03-03 10:43:49 +0000495is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000496{
497 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500498 struct list_head *tmp, *tmp1, *tmp2;
499 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 struct cifsTconInfo *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500501 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 struct cifsFileInfo *netfile;
503
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000504 cFYI(1, ("Checking for oplock break or dnotify response"));
Steve French790fe572007-07-07 19:25:05 +0000505 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000507 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000509 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 __u32 data_offset = 0;
Steve French790fe572007-07-07 19:25:05 +0000511 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 data_offset = le32_to_cpu(pSMBr->DataOffset);
513
Steve French39798772006-05-31 22:40:51 +0000514 pnotify = (struct file_notify_information *)
515 ((char *)&pSMBr->hdr.Protocol + data_offset);
Steve French63135e02007-07-17 17:34:02 +0000516 cFYI(1, ("dnotify on %s Action: 0x%x",
Steve Frenchaaa9bbe2008-05-23 17:38:32 +0000517 pnotify->FileName, pnotify->Action));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000518 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000519 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000520 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
Steve French790fe572007-07-07 19:25:05 +0000522 if (pSMBr->hdr.Status.CifsError) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000523 cFYI(1, ("notify err 0x%d",
524 pSMBr->hdr.Status.CifsError));
Steve French4b18f2a2008-04-29 00:06:05 +0000525 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 }
Steve French4b18f2a2008-04-29 00:06:05 +0000527 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000528 }
Steve French790fe572007-07-07 19:25:05 +0000529 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000530 return false;
Steve French790fe572007-07-07 19:25:05 +0000531 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 /* no sense logging error on invalid handle on oplock
533 break - harmless race between close request and oplock
534 break response is expected from time to time writing out
535 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000536 if ((NT_STATUS_INVALID_HANDLE) ==
537 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
538 cFYI(1, ("invalid handle on oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000539 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000540 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000542 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000544 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
546 }
Steve French790fe572007-07-07 19:25:05 +0000547 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000548 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000550 cFYI(1, ("oplock type 0x%d level 0x%d",
551 pSMB->LockType, pSMB->OplockLevel));
Steve French790fe572007-07-07 19:25:05 +0000552 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000553 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 /* look up tcon based on tid & uid */
Jeff Laytonf1987b42008-11-15 11:12:47 -0500556 read_lock(&cifs_tcp_ses_lock);
557 list_for_each(tmp, &srv->smb_ses_list) {
558 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
559 list_for_each(tmp1, &ses->tcon_list) {
560 tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list);
561 if (tcon->tid != buf->Tid)
562 continue;
563
Steve Frencha4544342005-08-24 13:59:35 -0700564 cifs_stats_inc(&tcon->num_oplock_brks);
Jeff Layton058daf42009-09-12 11:54:29 -0400565 read_lock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500566 list_for_each(tmp2, &tcon->openFileList) {
567 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700568 tlist);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500569 if (pSMB->Fid != netfile->netfid)
570 continue;
571
Jeff Layton058daf42009-09-12 11:54:29 -0400572 read_unlock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500573 read_unlock(&cifs_tcp_ses_lock);
574 cFYI(1, ("file id match, oplock break"));
575 pCifsInode = CIFS_I(netfile->pInode);
576 pCifsInode->clientCanCacheAll = false;
577 if (pSMB->OplockLevel == 0)
578 pCifsInode->clientCanCacheRead = false;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500579 AllocOplockQEntry(netfile->pInode,
580 netfile->netfid, tcon);
581 cFYI(1, ("about to wake up oplock thread"));
582 if (oplockThread)
583 wake_up_process(oplockThread);
584
585 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 }
Jeff Layton058daf42009-09-12 11:54:29 -0400587 read_unlock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500588 read_unlock(&cifs_tcp_ses_lock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000589 cFYI(1, ("No matching file for oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000590 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
592 }
Jeff Laytonf1987b42008-11-15 11:12:47 -0500593 read_unlock(&cifs_tcp_ses_lock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000594 cFYI(1, ("Can not process oplock break for non-existent connection"));
Steve French4b18f2a2008-04-29 00:06:05 +0000595 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596}
597
598void
599dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
600{
601 int i, j;
602 char debug_line[17];
603 unsigned char *buffer;
604
605 if (traceSMB == 0)
606 return;
607
608 buffer = (unsigned char *) smb_buf;
609 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000610 if (i % 8 == 0) {
611 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 printk(KERN_DEBUG "| ");
613 j = 0;
614 }
615 printk("%0#4x ", buffer[i]);
616 debug_line[2 * j] = ' ';
617 if (isprint(buffer[i]))
618 debug_line[1 + (2 * j)] = buffer[i];
619 else
620 debug_line[1 + (2 * j)] = '_';
621
Steve Frenchad7a2922008-02-07 23:25:02 +0000622 if (i % 8 == 7) {
623 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 debug_line[16] = 0;
625 printk(" | %s\n", debug_line);
626 }
627 }
628 for (; j < 8; j++) {
629 printk(" ");
630 debug_line[2 * j] = ' ';
631 debug_line[1 + (2 * j)] = ' ';
632 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000633 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return;
635}
Steve French6a0b4822005-04-28 22:41:05 -0700636
Steve French6c91d362005-04-28 22:41:06 -0700637/* Convert 16 bit Unicode pathname to wire format from string in current code
638 page. Conversion may involve remapping up the seven characters that are
639 only legal in POSIX-like OS (if they are present in the string). Path
640 names are little endian 16 bit Unicode on the wire */
641int
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000642cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
643 const struct nls_table *cp, int mapChars)
Steve French6c91d362005-04-28 22:41:06 -0700644{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000645 int i, j, charlen;
Steve French6c91d362005-04-28 22:41:06 -0700646 int len_remaining = maxlen;
647 char src_char;
Steve French70ca7342005-09-22 16:32:06 -0700648 __u16 temp;
Steve French6c91d362005-04-28 22:41:06 -0700649
Steve French790fe572007-07-07 19:25:05 +0000650 if (!mapChars)
Steve Frenche89dc922005-11-11 15:18:19 -0800651 return cifs_strtoUCS(target, source, PATH_MAX, cp);
Steve French6c91d362005-04-28 22:41:06 -0700652
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000653 for (i = 0, j = 0; i < maxlen; j++) {
Steve French6c91d362005-04-28 22:41:06 -0700654 src_char = source[i];
655 switch (src_char) {
656 case 0:
Steve Frenchf4cfd692005-07-14 18:29:02 -0500657 target[j] = 0;
Steve French6c91d362005-04-28 22:41:06 -0700658 goto ctoUCS_out;
659 case ':':
660 target[j] = cpu_to_le16(UNI_COLON);
661 break;
662 case '*':
663 target[j] = cpu_to_le16(UNI_ASTERIK);
664 break;
665 case '?':
666 target[j] = cpu_to_le16(UNI_QUESTION);
667 break;
668 case '<':
669 target[j] = cpu_to_le16(UNI_LESSTHAN);
670 break;
671 case '>':
672 target[j] = cpu_to_le16(UNI_GRTRTHAN);
673 break;
674 case '|':
675 target[j] = cpu_to_le16(UNI_PIPE);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000676 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 '\\':
681 target[j] = cpu_to_le16(UNI_SLASH);
682 break;*/
683 default:
684 charlen = cp->char2uni(source+i,
Steve French70ca7342005-09-22 16:32:06 -0700685 len_remaining, &temp);
Steve French6c91d362005-04-28 22:41:06 -0700686 /* if no match, use question mark, which
687 at least in some cases servers as wild card */
Steve French790fe572007-07-07 19:25:05 +0000688 if (charlen < 1) {
Steve French6c91d362005-04-28 22:41:06 -0700689 target[j] = cpu_to_le16(0x003f);
690 charlen = 1;
Steve French70ca7342005-09-22 16:32:06 -0700691 } else
692 target[j] = cpu_to_le16(temp);
Steve French6c91d362005-04-28 22:41:06 -0700693 len_remaining -= charlen;
694 /* character may take more than one byte in the
695 the source string, but will take exactly two
696 bytes in the target string */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000697 i += charlen;
Steve French6c91d362005-04-28 22:41:06 -0700698 continue;
699 }
700 i++; /* move to next char in source string */
701 len_remaining--;
702 }
703
704ctoUCS_out:
705 return i;
706}