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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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 kfree(buf_to_free);
136}
137
138struct smb_hdr *
139cifs_buf_get(void)
140{
141 struct smb_hdr *ret_buf = NULL;
142
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000143/* We could use negotiated size instead of max_msgsize -
144 but it may be more efficient to always alloc same size
145 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300147 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 /* clear the first few header bytes */
150 /* for most paths, more is cleared in header_assemble */
151 if (ret_buf) {
152 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
153 atomic_inc(&bufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800154#ifdef CONFIG_CIFS_STATS2
155 atomic_inc(&totBufAllocCount);
156#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158
159 return ret_buf;
160}
161
162void
163cifs_buf_release(void *buf_to_free)
164{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (buf_to_free == NULL) {
166 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
167 return;
168 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000169 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 atomic_dec(&bufAllocCount);
172 return;
173}
174
175struct smb_hdr *
176cifs_small_buf_get(void)
177{
178 struct smb_hdr *ret_buf = NULL;
179
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000180/* We could use negotiated size instead of max_msgsize -
181 but it may be more efficient to always alloc same size
182 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300184 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (ret_buf) {
186 /* No need to clear memory here, cleared in header assemble */
187 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
188 atomic_inc(&smBufAllocCount);
Steve French4498eed2005-12-03 13:58:57 -0800189#ifdef CONFIG_CIFS_STATS2
190 atomic_inc(&totSmBufAllocCount);
191#endif /* CONFIG_CIFS_STATS2 */
192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
194 return ret_buf;
195}
196
197void
198cifs_small_buf_release(void *buf_to_free)
199{
200
201 if (buf_to_free == NULL) {
202 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
203 return;
204 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000205 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 atomic_dec(&smBufAllocCount);
208 return;
209}
210
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000211/*
Steve French1982c342005-08-17 12:38:22 -0700212 Find a free multiplex id (SMB mid). Otherwise there could be
213 mid collisions which might cause problems, demultiplexing the
214 wrong response to this request. Multiplex ids could collide if
215 one of a series requests takes much longer than the others, or
216 if a very large number of long lived requests (byte range
217 locks or FindNotify requests) are pending. No more than
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000218 64K-1 requests can be outstanding at one time. If no
Steve French1982c342005-08-17 12:38:22 -0700219 mids are available, return zero. A future optimization
220 could make the combination of mids and uid the key we use
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000221 to demultiplex on (rather than mid alone).
Steve French1982c342005-08-17 12:38:22 -0700222 In addition to the above check, the cifs demultiplex
223 code already used the command code as a secondary
224 check of the frame and if signing is negotiated the
225 response would be discarded if the mid were the same
226 but the signature was wrong. Since the mid is not put in the
227 pending queue until later (when it is about to be dispatched)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000228 we do have to limit the number of outstanding requests
Steve French1982c342005-08-17 12:38:22 -0700229 to somewhat less than 64K-1 although it is hard to imagine
230 so many threads being in the vfs at one time.
231*/
232__u16 GetNextMid(struct TCP_Server_Info *server)
233{
234 __u16 mid = 0;
235 __u16 last_mid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000236 int collision;
Steve French1982c342005-08-17 12:38:22 -0700237
Steve French790fe572007-07-07 19:25:05 +0000238 if (server == NULL)
Steve French1982c342005-08-17 12:38:22 -0700239 return mid;
240
241 spin_lock(&GlobalMid_Lock);
242 last_mid = server->CurrentMid; /* we do not want to loop forever */
243 server->CurrentMid++;
244 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000245 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700246 fewer than 50, and the mids are likely to be unique
247 on the first pass through the loop unless some request
248 takes longer than the 64 thousand requests before it
249 (and it would also have to have been a request that
250 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000251 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700252 struct list_head *tmp;
253 struct mid_q_entry *mid_entry;
254
255 collision = 0;
Steve French790fe572007-07-07 19:25:05 +0000256 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700257 server->CurrentMid++;
258
259 list_for_each(tmp, &server->pending_mid_q) {
260 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
261
262 if ((mid_entry->mid == server->CurrentMid) &&
263 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {
264 /* This mid is in use, try a different one */
265 collision = 1;
266 break;
267 }
268 }
Steve French790fe572007-07-07 19:25:05 +0000269 if (collision == 0) {
Steve French1982c342005-08-17 12:38:22 -0700270 mid = server->CurrentMid;
271 break;
272 }
273 server->CurrentMid++;
274 }
275 spin_unlock(&GlobalMid_Lock);
276 return mid;
277}
278
279/* NB: MID can not be set if treeCon not passed in, in that
280 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281void
282header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
283 const struct cifsTconInfo *treeCon, int word_count
284 /* length of fixed section (word count) in two byte units */)
285{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000286 struct list_head *temp_item;
287 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 char *temp = (char *) buffer;
289
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000290 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 buffer->smb_buf_length =
Steve French630f3f02007-10-25 21:17:17 +0000293 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 4 /* RFC 1001 length field does not count */ +
295 2 /* for bcc field itself */ ;
Steve French1982c342005-08-17 12:38:22 -0700296 /* Note that this is the only network field that has to be converted
297 to big endian and it is done just before we send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 buffer->Protocol[0] = 0xFF;
300 buffer->Protocol[1] = 'S';
301 buffer->Protocol[2] = 'M';
302 buffer->Protocol[3] = 'B';
303 buffer->Command = smb_command;
304 buffer->Flags = 0x00; /* case sensitive */
305 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
306 buffer->Pid = cpu_to_le16((__u16)current->tgid);
307 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (treeCon) {
309 buffer->Tid = treeCon->tid;
310 if (treeCon->ses) {
311 if (treeCon->ses->capabilities & CAP_UNICODE)
312 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000313 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000315
Steve French1982c342005-08-17 12:38:22 -0700316 /* Uid is not converted */
317 buffer->Uid = treeCon->ses->Suid;
318 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000319 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 /* For the multiuser case, there are few obvious technically */
321 /* possible mechanisms to match the local linux user (uid) */
322 /* to a valid remote smb user (smb_uid): */
323 /* 1) Query Winbind (or other local pam/nss daemon */
324 /* for userid/password/logon_domain or credential */
325 /* 2) Query Winbind for uid to sid to username mapping */
326 /* and see if we have a matching password for existing*/
327 /* session for that user perhas getting password by */
328 /* adding a new pam_cifs module that stores passwords */
329 /* so that the cifs vfs can get at that for all logged*/
330 /* on users */
331 /* 3) (Which is the mechanism we have chosen) */
332 /* Search through sessions to the same server for a */
333 /* a match on the uid that was passed in on mount */
334 /* with the current processes uid (or euid?) and use */
335 /* that smb uid. If no existing smb session for */
336 /* that uid found, use the default smb session ie */
337 /* the smb session for the volume mounted which is */
338 /* the same as would be used if the multiuser mount */
339 /* flag were disabled. */
340
341 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000342 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 /* for other target tcp/ip addresses BB */
Steve French790fe572007-07-07 19:25:05 +0000344 if (current->fsuid != treeCon->ses->linux_uid) {
Steve French63135e02007-07-17 17:34:02 +0000345 cFYI(1, ("Multiuser mode and UID "
346 "did not match tcon uid"));
Jeff Layton14fbf502008-11-14 13:53:46 -0500347 read_lock(&cifs_tcp_ses_lock);
348 list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
349 ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list);
Steve French790fe572007-07-07 19:25:05 +0000350 if (ses->linux_uid == current->fsuid) {
351 if (ses->server == treeCon->ses->server) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000352 cFYI(1, ("found matching uid substitute right smb_uid"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 buffer->Uid = ses->Suid;
354 break;
355 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000356 /* BB eventually call cifs_setup_session here */
357 cFYI(1, ("local UID found but no smb sess with this server exists"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359 }
360 }
Jeff Layton14fbf502008-11-14 13:53:46 -0500361 read_unlock(&cifs_tcp_ses_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363 }
364 }
365 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
366 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700367 if (treeCon->nocase)
368 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000369 if ((treeCon->ses) && (treeCon->ses->server))
370 if (treeCon->ses->server->secMode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
372 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
373 }
374
375/* endian conversion of flags is now done just before sending */
376 buffer->WordCount = (char) word_count;
377 return;
378}
379
Steve French2cd646a2006-09-28 19:43:08 +0000380static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381checkSMBhdr(struct smb_hdr *smb, __u16 mid)
382{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000383 /* Make sure that this really is an SMB, that it is a response,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 and that the message ids match */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000385 if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
386 (mid == smb->Mid)) {
Steve French790fe572007-07-07 19:25:05 +0000387 if (smb->Flags & SMBFLG_RESPONSE)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000388 return 0;
389 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 /* only one valid case where server sends us request */
Steve French790fe572007-07-07 19:25:05 +0000391 if (smb->Command == SMB_COM_LOCKING_ANDX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return 0;
393 else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000394 cERROR(1, ("Received Request not response"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
396 } else { /* bad signature or mid */
397 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
398 cERROR(1,
Steve French6ab16d22005-11-29 20:55:11 -0800399 ("Bad protocol string signature header %x",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 *(unsigned int *) smb->Protocol));
401 if (mid != smb->Mid)
402 cERROR(1, ("Mids do not match"));
403 }
404 cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
405 return 1;
406}
407
408int
Steve Frenchd103e162006-10-12 17:49:24 +0000409checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Steve French70ca7342005-09-22 16:32:06 -0700411 __u32 len = smb->smb_buf_length;
Steve French190fdeb2005-10-10 11:48:26 -0700412 __u32 clc_len; /* calculated length */
Steve French184ed212006-02-24 06:15:11 +0000413 cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));
Steve Frenchd103e162006-10-12 17:49:24 +0000414
Steve French630f3f02007-10-25 21:17:17 +0000415 if (length < 2 + sizeof(struct smb_hdr)) {
416 if ((length >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 && (smb->Status.CifsError != 0)) {
Steve Frenchd103e162006-10-12 17:49:24 +0000418 smb->WordCount = 0;
419 /* some error cases do not return wct and bcc */
420 return 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000421 } else if ((length == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000422 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000423 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000424 /* Need to work around a bug in two servers here */
425 /* First, check if the part of bcc they sent was zero */
426 if (tmp[sizeof(struct smb_hdr)] == 0) {
427 /* some servers return only half of bcc
428 * on simple responses (wct, bcc both zero)
429 * in particular have seen this on
430 * ulogoffX and FindClose. This leaves
431 * one byte of bcc potentially unitialized
432 */
433 /* zero rest of bcc */
434 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000435 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000437 cERROR(1, ("rcvd invalid byte count (bcc)"));
Steve Frenchd103e162006-10-12 17:49:24 +0000438 } else {
439 cERROR(1, ("Length less than smb header size"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
Steve Frenchd103e162006-10-12 17:49:24 +0000441 return 1;
442 }
443 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
444 cERROR(1, ("smb length greater than MaxBufSize, mid=%d",
Steve French184ed212006-02-24 06:15:11 +0000445 smb->Mid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return 1;
447 }
448
449 if (checkSMBhdr(smb, mid))
450 return 1;
Steve French190fdeb2005-10-10 11:48:26 -0700451 clc_len = smbCalcSize_LE(smb);
Steve French184ed212006-02-24 06:15:11 +0000452
Steve French790fe572007-07-07 19:25:05 +0000453 if (4 + len != length) {
Steve French63135e02007-07-17 17:34:02 +0000454 cERROR(1, ("Length read does not match RFC1001 length %d",
455 len));
Steve French184ed212006-02-24 06:15:11 +0000456 return 1;
457 }
458
459 if (4 + len != clc_len) {
460 /* check if bcc wrapped around for large read responses */
Steve French790fe572007-07-07 19:25:05 +0000461 if ((len > 64 * 1024) && (len > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000462 /* check if lengths match mod 64K */
Steve French790fe572007-07-07 19:25:05 +0000463 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000464 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000465 }
Steve French46c79a62006-03-02 00:07:08 +0000466 cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
467 clc_len, 4 + len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700468 /* Windows XP can return a few bytes too much, presumably
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000469 an illegal pad, at the end of byte range lock responses
Steve French6ab16d22005-11-29 20:55:11 -0800470 so we allow for that three byte pad, as long as actual
Steve French190fdeb2005-10-10 11:48:26 -0700471 received length is as long or longer than calculated length */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000472 /* We have now had to extend this more, since there is a
Steve French6ab16d22005-11-29 20:55:11 -0800473 case in which it needs to be bigger still to handle a
474 malformed response to transact2 findfirst from WinXP when
475 access denied is returned and thus bcc and wct are zero
476 but server says length is 0x21 bytes too long as if the server
477 forget to reset the smb rfc1001 length when it reset the
478 wct and bcc to minimum size and drop the t2 parms and data */
Steve French790fe572007-07-07 19:25:05 +0000479 if ((4+len > clc_len) && (len <= clc_len + 512))
Steve French190fdeb2005-10-10 11:48:26 -0700480 return 0;
Steve French46c79a62006-03-02 00:07:08 +0000481 else {
482 cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
483 len, smb->Mid));
Steve French190fdeb2005-10-10 11:48:26 -0700484 return 1;
Steve French46c79a62006-03-02 00:07:08 +0000485 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 }
Steve French20962432005-09-21 22:05:57 -0700487 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
Steve French4b18f2a2008-04-29 00:06:05 +0000489
490bool
Steve Frenchd7c8c942006-03-03 10:43:49 +0000491is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000492{
493 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500494 struct list_head *tmp, *tmp1, *tmp2;
495 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 struct cifsTconInfo *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500497 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 struct cifsFileInfo *netfile;
499
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000500 cFYI(1, ("Checking for oplock break or dnotify response"));
Steve French790fe572007-07-07 19:25:05 +0000501 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000503 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000505 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 __u32 data_offset = 0;
Steve French790fe572007-07-07 19:25:05 +0000507 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 data_offset = le32_to_cpu(pSMBr->DataOffset);
509
Steve French39798772006-05-31 22:40:51 +0000510 pnotify = (struct file_notify_information *)
511 ((char *)&pSMBr->hdr.Protocol + data_offset);
Steve French63135e02007-07-17 17:34:02 +0000512 cFYI(1, ("dnotify on %s Action: 0x%x",
Steve Frenchaaa9bbe2008-05-23 17:38:32 +0000513 pnotify->FileName, pnotify->Action));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000514 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000515 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000516 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
Steve French790fe572007-07-07 19:25:05 +0000518 if (pSMBr->hdr.Status.CifsError) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000519 cFYI(1, ("notify err 0x%d",
520 pSMBr->hdr.Status.CifsError));
Steve French4b18f2a2008-04-29 00:06:05 +0000521 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 }
Steve French4b18f2a2008-04-29 00:06:05 +0000523 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000524 }
Steve French790fe572007-07-07 19:25:05 +0000525 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000526 return false;
Steve French790fe572007-07-07 19:25:05 +0000527 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 /* no sense logging error on invalid handle on oplock
529 break - harmless race between close request and oplock
530 break response is expected from time to time writing out
531 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000532 if ((NT_STATUS_INVALID_HANDLE) ==
533 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
534 cFYI(1, ("invalid handle on oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000535 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000536 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000538 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000540 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542 }
Steve French790fe572007-07-07 19:25:05 +0000543 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000544 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000546 cFYI(1, ("oplock type 0x%d level 0x%d",
547 pSMB->LockType, pSMB->OplockLevel));
Steve French790fe572007-07-07 19:25:05 +0000548 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000549 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 /* look up tcon based on tid & uid */
Jeff Laytonf1987b42008-11-15 11:12:47 -0500552 read_lock(&cifs_tcp_ses_lock);
553 list_for_each(tmp, &srv->smb_ses_list) {
554 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
555 list_for_each(tmp1, &ses->tcon_list) {
556 tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list);
557 if (tcon->tid != buf->Tid)
558 continue;
559
Steve Frencha4544342005-08-24 13:59:35 -0700560 cifs_stats_inc(&tcon->num_oplock_brks);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000561 write_lock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500562 list_for_each(tmp2, &tcon->openFileList) {
563 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700564 tlist);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500565 if (pSMB->Fid != netfile->netfid)
566 continue;
567
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000568 write_unlock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500569 read_unlock(&cifs_tcp_ses_lock);
570 cFYI(1, ("file id match, oplock break"));
571 pCifsInode = CIFS_I(netfile->pInode);
572 pCifsInode->clientCanCacheAll = false;
573 if (pSMB->OplockLevel == 0)
574 pCifsInode->clientCanCacheRead = false;
575 pCifsInode->oplockPending = true;
576 AllocOplockQEntry(netfile->pInode,
577 netfile->netfid, tcon);
578 cFYI(1, ("about to wake up oplock thread"));
579 if (oplockThread)
580 wake_up_process(oplockThread);
581
582 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 }
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000584 write_unlock(&GlobalSMBSeslock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500585 read_unlock(&cifs_tcp_ses_lock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000586 cFYI(1, ("No matching file for oplock break"));
Steve French4b18f2a2008-04-29 00:06:05 +0000587 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 }
589 }
Jeff Laytonf1987b42008-11-15 11:12:47 -0500590 read_unlock(&cifs_tcp_ses_lock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000591 cFYI(1, ("Can not process oplock break for non-existent connection"));
Steve French4b18f2a2008-04-29 00:06:05 +0000592 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}
594
595void
596dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
597{
598 int i, j;
599 char debug_line[17];
600 unsigned char *buffer;
601
602 if (traceSMB == 0)
603 return;
604
605 buffer = (unsigned char *) smb_buf;
606 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000607 if (i % 8 == 0) {
608 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 printk(KERN_DEBUG "| ");
610 j = 0;
611 }
612 printk("%0#4x ", buffer[i]);
613 debug_line[2 * j] = ' ';
614 if (isprint(buffer[i]))
615 debug_line[1 + (2 * j)] = buffer[i];
616 else
617 debug_line[1 + (2 * j)] = '_';
618
Steve Frenchad7a2922008-02-07 23:25:02 +0000619 if (i % 8 == 7) {
620 /* 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 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000630 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 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}