blob: 72e99ece78cfe590c6739e56211fc58e1f5bcc69 [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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Steve Frenchfb8c4b12007-07-10 01:16:18 +000036/* The xid serves as a useful identifier for each incoming vfs request,
37 in a similar way to the mid which is useful to track each sent smb,
38 and CurrentXid can also provide a running counter (although it
39 will eventually wrap past zero) of the total vfs operations handled
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 since the cifs fs was mounted */
41
42unsigned int
43_GetXid(void)
44{
45 unsigned int xid;
46
47 spin_lock(&GlobalMid_Lock);
48 GlobalTotalActiveXid++;
Steve French50c2f752007-07-13 00:33:32 +000049
50 /* keep high water mark for number of simultaneous ops in filesystem */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
Steve French50c2f752007-07-13 00:33:32 +000052 GlobalMaxActiveXid = GlobalTotalActiveXid;
Steve French790fe572007-07-07 19:25:05 +000053 if (GlobalTotalActiveXid > 65000)
Joe Perchesb6b38f72010-04-21 03:50:45 +000054 cFYI(1, "warning: more than 65000 requests active");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 xid = GlobalCurrentXid++;
56 spin_unlock(&GlobalMid_Lock);
57 return xid;
58}
59
60void
61_FreeXid(unsigned int xid)
62{
63 spin_lock(&GlobalMid_Lock);
Steve French790fe572007-07-07 19:25:05 +000064 /* if (GlobalTotalActiveXid == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 BUG(); */
66 GlobalTotalActiveXid--;
67 spin_unlock(&GlobalMid_Lock);
68}
69
70struct cifsSesInfo *
71sesInfoAlloc(void)
72{
73 struct cifsSesInfo *ret_buf;
74
Steve French630f3f0c2007-10-25 21:17:17 +000075 ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 atomic_inc(&sesInfoAllocCount);
78 ret_buf->status = CifsNew;
Jeff Layton14fbf502008-11-14 13:53:46 -050079 ++ret_buf->ses_count;
80 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -050081 INIT_LIST_HEAD(&ret_buf->tcon_list);
Steve Frenchd7b619c2010-02-25 05:36:46 +000082 mutex_init(&ret_buf->session_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
84 return ret_buf;
85}
86
87void
88sesInfoFree(struct cifsSesInfo *buf_to_free)
89{
90 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +000091 cFYI(1, "Null buffer passed to sesInfoFree");
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return;
93 }
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 atomic_dec(&sesInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -080096 kfree(buf_to_free->serverOS);
97 kfree(buf_to_free->serverDomain);
98 kfree(buf_to_free->serverNOS);
Jeff Layton55162de2008-12-05 20:41:21 -050099 if (buf_to_free->password) {
100 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
101 kfree(buf_to_free->password);
102 }
Steve French39798772006-05-31 22:40:51 +0000103 kfree(buf_to_free->domainName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 kfree(buf_to_free);
105}
106
107struct cifsTconInfo *
108tconInfoAlloc(void)
109{
110 struct cifsTconInfo *ret_buf;
Steve French630f3f0c2007-10-25 21:17:17 +0000111 ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 atomic_inc(&tconInfoAllocCount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 ret_buf->tidStatus = CifsNew;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500115 ++ret_buf->tc_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 INIT_LIST_HEAD(&ret_buf->openFileList);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500117 INIT_LIST_HEAD(&ret_buf->tcon_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#ifdef CONFIG_CIFS_STATS
119 spin_lock_init(&ret_buf->stat_lock);
120#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122 return ret_buf;
123}
124
125void
126tconInfoFree(struct cifsTconInfo *buf_to_free)
127{
128 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000129 cFYI(1, "Null buffer passed to tconInfoFree");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return;
131 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 atomic_dec(&tconInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800133 kfree(buf_to_free->nativeFileSystem);
Jeff Layton00e485b2008-12-05 20:41:21 -0500134 if (buf_to_free->password) {
135 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
136 kfree(buf_to_free->password);
137 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 kfree(buf_to_free);
139}
140
141struct smb_hdr *
142cifs_buf_get(void)
143{
144 struct smb_hdr *ret_buf = NULL;
145
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000146/* We could use negotiated size instead of max_msgsize -
147 but it may be more efficient to always alloc same size
148 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300150 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 /* clear the first few header bytes */
153 /* for most paths, more is cleared in header_assemble */
154 if (ret_buf) {
155 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
156 atomic_inc(&bufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800157#ifdef CONFIG_CIFS_STATS2
158 atomic_inc(&totBufAllocCount);
159#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161
162 return ret_buf;
163}
164
165void
166cifs_buf_release(void *buf_to_free)
167{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000169 /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return;
171 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000172 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 atomic_dec(&bufAllocCount);
175 return;
176}
177
178struct smb_hdr *
179cifs_small_buf_get(void)
180{
181 struct smb_hdr *ret_buf = NULL;
182
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000183/* We could use negotiated size instead of max_msgsize -
184 but it may be more efficient to always alloc same size
185 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300187 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (ret_buf) {
189 /* No need to clear memory here, cleared in header assemble */
190 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
191 atomic_inc(&smBufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800192#ifdef CONFIG_CIFS_STATS2
193 atomic_inc(&totSmBufAllocCount);
194#endif /* CONFIG_CIFS_STATS2 */
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 }
197 return ret_buf;
198}
199
200void
201cifs_small_buf_release(void *buf_to_free)
202{
203
204 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000205 cFYI(1, "Null buffer passed to cifs_small_buf_release");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 return;
207 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000208 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 atomic_dec(&smBufAllocCount);
211 return;
212}
213
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000214/*
Steve French1982c342005-08-17 12:38:22 -0700215 Find a free multiplex id (SMB mid). Otherwise there could be
216 mid collisions which might cause problems, demultiplexing the
217 wrong response to this request. Multiplex ids could collide if
218 one of a series requests takes much longer than the others, or
219 if a very large number of long lived requests (byte range
220 locks or FindNotify requests) are pending. No more than
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000221 64K-1 requests can be outstanding at one time. If no
Steve French1982c342005-08-17 12:38:22 -0700222 mids are available, return zero. A future optimization
223 could make the combination of mids and uid the key we use
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000224 to demultiplex on (rather than mid alone).
Steve French1982c342005-08-17 12:38:22 -0700225 In addition to the above check, the cifs demultiplex
226 code already used the command code as a secondary
227 check of the frame and if signing is negotiated the
228 response would be discarded if the mid were the same
229 but the signature was wrong. Since the mid is not put in the
230 pending queue until later (when it is about to be dispatched)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000231 we do have to limit the number of outstanding requests
Steve French1982c342005-08-17 12:38:22 -0700232 to somewhat less than 64K-1 although it is hard to imagine
233 so many threads being in the vfs at one time.
234*/
235__u16 GetNextMid(struct TCP_Server_Info *server)
236{
237 __u16 mid = 0;
238 __u16 last_mid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000239 int collision;
Steve French1982c342005-08-17 12:38:22 -0700240
Steve French790fe572007-07-07 19:25:05 +0000241 if (server == NULL)
Steve French1982c342005-08-17 12:38:22 -0700242 return mid;
243
244 spin_lock(&GlobalMid_Lock);
245 last_mid = server->CurrentMid; /* we do not want to loop forever */
246 server->CurrentMid++;
247 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000248 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700249 fewer than 50, and the mids are likely to be unique
250 on the first pass through the loop unless some request
251 takes longer than the 64 thousand requests before it
252 (and it would also have to have been a request that
253 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000254 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700255 struct list_head *tmp;
256 struct mid_q_entry *mid_entry;
257
258 collision = 0;
Steve French790fe572007-07-07 19:25:05 +0000259 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700260 server->CurrentMid++;
261
262 list_for_each(tmp, &server->pending_mid_q) {
263 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
264
265 if ((mid_entry->mid == server->CurrentMid) &&
266 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {
267 /* This mid is in use, try a different one */
268 collision = 1;
269 break;
270 }
271 }
Steve French790fe572007-07-07 19:25:05 +0000272 if (collision == 0) {
Steve French1982c342005-08-17 12:38:22 -0700273 mid = server->CurrentMid;
274 break;
275 }
276 server->CurrentMid++;
277 }
278 spin_unlock(&GlobalMid_Lock);
279 return mid;
280}
281
282/* NB: MID can not be set if treeCon not passed in, in that
283 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284void
285header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
286 const struct cifsTconInfo *treeCon, int word_count
287 /* length of fixed section (word count) in two byte units */)
288{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000289 struct list_head *temp_item;
290 struct cifsSesInfo *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 char *temp = (char *) buffer;
292
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000293 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 buffer->smb_buf_length =
Steve French630f3f0c2007-10-25 21:17:17 +0000296 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 4 /* RFC 1001 length field does not count */ +
298 2 /* for bcc field itself */ ;
Steve French1982c342005-08-17 12:38:22 -0700299 /* Note that this is the only network field that has to be converted
300 to big endian and it is done just before we send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 buffer->Protocol[0] = 0xFF;
303 buffer->Protocol[1] = 'S';
304 buffer->Protocol[2] = 'M';
305 buffer->Protocol[3] = 'B';
306 buffer->Command = smb_command;
307 buffer->Flags = 0x00; /* case sensitive */
308 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
309 buffer->Pid = cpu_to_le16((__u16)current->tgid);
310 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (treeCon) {
312 buffer->Tid = treeCon->tid;
313 if (treeCon->ses) {
314 if (treeCon->ses->capabilities & CAP_UNICODE)
315 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000316 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000318
Steve French1982c342005-08-17 12:38:22 -0700319 /* Uid is not converted */
320 buffer->Uid = treeCon->ses->Suid;
321 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000322 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 /* For the multiuser case, there are few obvious technically */
324 /* possible mechanisms to match the local linux user (uid) */
325 /* to a valid remote smb user (smb_uid): */
326 /* 1) Query Winbind (or other local pam/nss daemon */
327 /* for userid/password/logon_domain or credential */
328 /* 2) Query Winbind for uid to sid to username mapping */
329 /* and see if we have a matching password for existing*/
330 /* session for that user perhas getting password by */
331 /* adding a new pam_cifs module that stores passwords */
332 /* so that the cifs vfs can get at that for all logged*/
333 /* on users */
334 /* 3) (Which is the mechanism we have chosen) */
335 /* Search through sessions to the same server for a */
336 /* a match on the uid that was passed in on mount */
337 /* with the current processes uid (or euid?) and use */
338 /* that smb uid. If no existing smb session for */
339 /* that uid found, use the default smb session ie */
340 /* the smb session for the volume mounted which is */
341 /* the same as would be used if the multiuser mount */
342 /* flag were disabled. */
343
344 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000345 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 /* for other target tcp/ip addresses BB */
David Howellsa001e5b2008-11-14 10:38:47 +1100347 if (current_fsuid() != treeCon->ses->linux_uid) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000348 cFYI(1, "Multiuser mode and UID "
349 "did not match tcon uid");
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530350 spin_lock(&cifs_tcp_ses_lock);
Jeff Layton14fbf502008-11-14 13:53:46 -0500351 list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
352 ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list);
David Howellsa001e5b2008-11-14 10:38:47 +1100353 if (ses->linux_uid == current_fsuid()) {
Steve French790fe572007-07-07 19:25:05 +0000354 if (ses->server == treeCon->ses->server) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000355 cFYI(1, "found matching uid substitute right smb_uid");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 buffer->Uid = ses->Suid;
357 break;
358 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000359 /* BB eventually call cifs_setup_session here */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000360 cFYI(1, "local UID found but no smb sess with this server exists");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
362 }
363 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530364 spin_unlock(&cifs_tcp_ses_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366 }
367 }
368 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
369 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700370 if (treeCon->nocase)
371 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000372 if ((treeCon->ses) && (treeCon->ses->server))
373 if (treeCon->ses->server->secMode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
375 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
376 }
377
378/* endian conversion of flags is now done just before sending */
379 buffer->WordCount = (char) word_count;
380 return;
381}
382
Steve French2cd646a2006-09-28 19:43:08 +0000383static int
Jeff Layton68abaff2011-01-28 15:05:42 -0500384check_smb_hdr(struct smb_hdr *smb, __u16 mid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Jeff Layton68abaff2011-01-28 15:05:42 -0500386 /* does it have the right SMB "signature" ? */
387 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
388 cERROR(1, "Bad protocol string signature header 0x%x",
389 *(unsigned int *)smb->Protocol);
390 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
Jeff Layton68abaff2011-01-28 15:05:42 -0500392
393 /* Make sure that message ids match */
394 if (mid != smb->Mid) {
395 cERROR(1, "Mids do not match. received=%u expected=%u",
396 smb->Mid, mid);
397 return 1;
398 }
399
400 /* if it's a response then accept */
401 if (smb->Flags & SMBFLG_RESPONSE)
402 return 0;
403
404 /* only one valid case where server sends us request */
405 if (smb->Command == SMB_COM_LOCKING_ANDX)
406 return 0;
407
408 cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 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 */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000417 cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len);
Steve Frenchd103e162006-10-12 17:49:24 +0000418
Steve French630f3f0c2007-10-25 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 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000441 cERROR(1, "rcvd invalid byte count (bcc)");
Steve Frenchd103e162006-10-12 17:49:24 +0000442 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000443 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) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000448 cERROR(1, "smb length greater than MaxBufSize, mid=%d",
449 smb->Mid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return 1;
451 }
452
Jeff Layton68abaff2011-01-28 15:05:42 -0500453 if (check_smb_hdr(smb, mid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 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) {
Joe Perchesb6b38f72010-04-21 03:50:45 +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 }
Joe Perchesb6b38f72010-04-21 03:50:45 +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 {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000486 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
Joe Perchesb6b38f72010-04-21 03:50:45 +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);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000516 cFYI(1, "dnotify on %s Action: 0x%x",
517 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) {
Joe Perchesb6b38f72010-04-21 03:50:45 +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)) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000538 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
Joe Perchesb6b38f72010-04-21 03:50:45 +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 */
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530556 spin_lock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500557 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 Layton44772882010-10-15 15:34:03 -0400565 spin_lock(&cifs_file_list_lock);
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
Joe Perchesb6b38f72010-04-21 03:50:45 +0000572 cFYI(1, "file id match, oplock break");
Jeff Laytona5e18bc2010-10-11 15:07:18 -0400573 pCifsInode = CIFS_I(netfile->dentry->d_inode);
Tejun Heo9b646972010-07-20 22:09:02 +0200574
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300575 cifs_set_oplock_level(pCifsInode,
Pavel Shilovsky12fed002011-01-17 20:15:44 +0300576 pSMB->OplockLevel ? OPLOCK_READ : 0);
Tejun Heo9b646972010-07-20 22:09:02 +0200577 /*
578 * cifs_oplock_break_put() can't be called
579 * from here. Get reference after queueing
580 * succeeded. cifs_oplock_break() will
Suresh Jayaraman6573e9b2010-10-18 23:52:18 +0530581 * synchronize using cifs_file_list_lock.
Tejun Heo9b646972010-07-20 22:09:02 +0200582 */
583 if (queue_work(system_nrt_wq,
584 &netfile->oplock_break))
585 cifs_oplock_break_get(netfile);
586 netfile->oplock_break_cancelled = false;
587
Jeff Layton44772882010-10-15 15:34:03 -0400588 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530589 spin_unlock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500590 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
Jeff Layton44772882010-10-15 15:34:03 -0400592 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530593 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000594 cFYI(1, "No matching file for oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000595 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
597 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530598 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000599 cFYI(1, "Can not process oplock break for non-existent connection");
Steve French4b18f2a2008-04-29 00:06:05 +0000600 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
603void
604dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
605{
606 int i, j;
607 char debug_line[17];
608 unsigned char *buffer;
609
610 if (traceSMB == 0)
611 return;
612
613 buffer = (unsigned char *) smb_buf;
614 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000615 if (i % 8 == 0) {
616 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 printk(KERN_DEBUG "| ");
618 j = 0;
619 }
620 printk("%0#4x ", buffer[i]);
621 debug_line[2 * j] = ' ';
622 if (isprint(buffer[i]))
623 debug_line[1 + (2 * j)] = buffer[i];
624 else
625 debug_line[1 + (2 * j)] = '_';
626
Steve Frenchad7a2922008-02-07 23:25:02 +0000627 if (i % 8 == 7) {
628 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 debug_line[16] = 0;
630 printk(" | %s\n", debug_line);
631 }
632 }
633 for (; j < 8; j++) {
634 printk(" ");
635 debug_line[2 * j] = ' ';
636 debug_line[1 + (2 * j)] = ' ';
637 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000638 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return;
640}
Steve French6a0b4822005-04-28 22:41:05 -0700641
Jeff Laytonec06aed2009-11-06 14:18:29 -0500642void
643cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
644{
645 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
Suresh Jayaramanf534dc92009-11-16 12:03:16 +0530646 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000647 cERROR(1, "Autodisabling the use of server inode numbers on "
Jeff Laytonec06aed2009-11-06 14:18:29 -0500648 "%s. This server doesn't seem to support them "
649 "properly. Hardlinks will not be recognized on this "
650 "mount. Consider mounting with the \"noserverino\" "
651 "option to silence this message.",
Jeff Layton0d424ad2010-09-20 16:01:35 -0700652 cifs_sb_master_tcon(cifs_sb)->treeName);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500653 }
654}
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300655
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300656void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300657{
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300658 oplock &= 0xF;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300659
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300660 if (oplock == OPLOCK_EXCLUSIVE) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300661 cinode->clientCanCacheAll = true;
662 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300663 cFYI(1, "Exclusive Oplock granted on inode %p",
664 &cinode->vfs_inode);
665 } else if (oplock == OPLOCK_READ) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300666 cinode->clientCanCacheAll = false;
667 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300668 cFYI(1, "Level II Oplock granted on inode %p",
669 &cinode->vfs_inode);
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300670 } else {
671 cinode->clientCanCacheAll = false;
672 cinode->clientCanCacheRead = false;
673 }
674}