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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;
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
Steve French96daf2b2011-05-27 04:34:02 +000070struct cifs_ses *
Linus Torvalds1da177e2005-04-16 15:20:36 -070071sesInfoAlloc(void)
72{
Steve French96daf2b2011-05-27 04:34:02 +000073 struct cifs_ses *ret_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Steve French96daf2b2011-05-27 04:34:02 +000075 ret_buf = kzalloc(sizeof(struct cifs_ses), 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
Steve French96daf2b2011-05-27 04:34:02 +000088sesInfoFree(struct cifs_ses *buf_to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
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 French8727c8a2011-02-25 01:11:56 -0600103 kfree(buf_to_free->user_name);
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
Steve French96daf2b2011-05-27 04:34:02 +0000108struct cifs_tcon *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109tconInfoAlloc(void)
110{
Steve French96daf2b2011-05-27 04:34:02 +0000111 struct cifs_tcon *ret_buf;
112 ret_buf = kzalloc(sizeof(struct cifs_tcon), 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
Steve French96daf2b2011-05-27 04:34:02 +0000127tconInfoFree(struct cifs_tcon *buf_to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
129 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000130 cFYI(1, "Null buffer passed to tconInfoFree");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 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 French4498eed52005-12-03 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) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000170 /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 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 French4498eed52005-12-03 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) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000206 cFYI(1, "Null buffer passed to cifs_small_buf_release");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 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;
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500240 bool collision;
Steve French1982c342005-08-17 12:38:22 -0700241
242 spin_lock(&GlobalMid_Lock);
243 last_mid = server->CurrentMid; /* we do not want to loop forever */
244 server->CurrentMid++;
245 /* This nested loop looks more expensive than it is.
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000246 In practice the list of pending requests is short,
Steve French1982c342005-08-17 12:38:22 -0700247 fewer than 50, and the mids are likely to be unique
248 on the first pass through the loop unless some request
249 takes longer than the 64 thousand requests before it
250 (and it would also have to have been a request that
251 did not time out) */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000252 while (server->CurrentMid != last_mid) {
Steve French1982c342005-08-17 12:38:22 -0700253 struct mid_q_entry *mid_entry;
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500254 unsigned int num_mids;
Steve French1982c342005-08-17 12:38:22 -0700255
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500256 collision = false;
Steve French790fe572007-07-07 19:25:05 +0000257 if (server->CurrentMid == 0)
Steve French1982c342005-08-17 12:38:22 -0700258 server->CurrentMid++;
259
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500260 num_mids = 0;
261 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
262 ++num_mids;
263 if (mid_entry->mid == server->CurrentMid &&
264 mid_entry->midState == MID_REQUEST_SUBMITTED) {
Steve French1982c342005-08-17 12:38:22 -0700265 /* This mid is in use, try a different one */
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500266 collision = true;
Steve French1982c342005-08-17 12:38:22 -0700267 break;
268 }
269 }
Jeff Layton92a4e0f2011-01-29 07:02:28 -0500270
271 /*
272 * if we have more than 32k mids in the list, then something
273 * is very wrong. Possibly a local user is trying to DoS the
274 * box by issuing long-running calls and SIGKILL'ing them. If
275 * we get to 2^16 mids then we're in big trouble as this
276 * function could loop forever.
277 *
278 * Go ahead and assign out the mid in this situation, but force
279 * an eventual reconnect to clean out the pending_mid_q.
280 */
281 if (num_mids > 32768)
282 server->tcpStatus = CifsNeedReconnect;
283
284 if (!collision) {
Steve French1982c342005-08-17 12:38:22 -0700285 mid = server->CurrentMid;
286 break;
287 }
288 server->CurrentMid++;
289 }
290 spin_unlock(&GlobalMid_Lock);
291 return mid;
292}
293
294/* NB: MID can not be set if treeCon not passed in, in that
295 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296void
297header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
Steve French96daf2b2011-05-27 04:34:02 +0000298 const struct cifs_tcon *treeCon, int word_count
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 /* length of fixed section (word count) in two byte units */)
300{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000301 struct list_head *temp_item;
Steve French96daf2b2011-05-27 04:34:02 +0000302 struct cifs_ses *ses;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 char *temp = (char *) buffer;
304
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000305 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000307 buffer->smb_buf_length = cpu_to_be32(
Steve French630f3f0c2007-10-25 21:17:17 +0000308 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 4 /* RFC 1001 length field does not count */ +
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000310 2 /* for bcc field itself */) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 buffer->Protocol[0] = 0xFF;
313 buffer->Protocol[1] = 'S';
314 buffer->Protocol[2] = 'M';
315 buffer->Protocol[3] = 'B';
316 buffer->Command = smb_command;
317 buffer->Flags = 0x00; /* case sensitive */
318 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
319 buffer->Pid = cpu_to_le16((__u16)current->tgid);
320 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (treeCon) {
322 buffer->Tid = treeCon->tid;
323 if (treeCon->ses) {
324 if (treeCon->ses->capabilities & CAP_UNICODE)
325 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000326 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000328
Steve French1982c342005-08-17 12:38:22 -0700329 /* Uid is not converted */
330 buffer->Uid = treeCon->ses->Suid;
331 buffer->Mid = GetNextMid(treeCon->ses->server);
Steve French790fe572007-07-07 19:25:05 +0000332 if (multiuser_mount != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 /* For the multiuser case, there are few obvious technically */
334 /* possible mechanisms to match the local linux user (uid) */
335 /* to a valid remote smb user (smb_uid): */
336 /* 1) Query Winbind (or other local pam/nss daemon */
337 /* for userid/password/logon_domain or credential */
338 /* 2) Query Winbind for uid to sid to username mapping */
339 /* and see if we have a matching password for existing*/
340 /* session for that user perhas getting password by */
341 /* adding a new pam_cifs module that stores passwords */
342 /* so that the cifs vfs can get at that for all logged*/
343 /* on users */
344 /* 3) (Which is the mechanism we have chosen) */
345 /* Search through sessions to the same server for a */
346 /* a match on the uid that was passed in on mount */
347 /* with the current processes uid (or euid?) and use */
348 /* that smb uid. If no existing smb session for */
349 /* that uid found, use the default smb session ie */
350 /* the smb session for the volume mounted which is */
351 /* the same as would be used if the multiuser mount */
352 /* flag were disabled. */
353
354 /* BB Add support for establishing new tCon and SMB Session */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000355 /* with userid/password pairs found on the smb session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 /* for other target tcp/ip addresses BB */
David Howellsa001e5b2008-11-14 10:38:47 +1100357 if (current_fsuid() != treeCon->ses->linux_uid) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000358 cFYI(1, "Multiuser mode and UID "
359 "did not match tcon uid");
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530360 spin_lock(&cifs_tcp_ses_lock);
Jeff Layton14fbf502008-11-14 13:53:46 -0500361 list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000362 ses = list_entry(temp_item, struct cifs_ses, smb_ses_list);
David Howellsa001e5b2008-11-14 10:38:47 +1100363 if (ses->linux_uid == current_fsuid()) {
Steve French790fe572007-07-07 19:25:05 +0000364 if (ses->server == treeCon->ses->server) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000365 cFYI(1, "found matching uid substitute right smb_uid");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 buffer->Uid = ses->Suid;
367 break;
368 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000369 /* BB eventually call cifs_setup_session here */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000370 cFYI(1, "local UID found but no smb sess with this server exists");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
372 }
373 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530374 spin_unlock(&cifs_tcp_ses_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
376 }
377 }
378 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
379 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700380 if (treeCon->nocase)
381 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000382 if ((treeCon->ses) && (treeCon->ses->server))
Steve French96daf2b2011-05-27 04:34:02 +0000383 if (treeCon->ses->server->sec_mode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
385 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
386 }
387
388/* endian conversion of flags is now done just before sending */
389 buffer->WordCount = (char) word_count;
390 return;
391}
392
Steve French2cd646a2006-09-28 19:43:08 +0000393static int
Jeff Layton68abaff2011-01-28 15:05:42 -0500394check_smb_hdr(struct smb_hdr *smb, __u16 mid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
Jeff Layton68abaff2011-01-28 15:05:42 -0500396 /* does it have the right SMB "signature" ? */
397 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
398 cERROR(1, "Bad protocol string signature header 0x%x",
399 *(unsigned int *)smb->Protocol);
400 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
Jeff Layton68abaff2011-01-28 15:05:42 -0500402
403 /* Make sure that message ids match */
404 if (mid != smb->Mid) {
405 cERROR(1, "Mids do not match. received=%u expected=%u",
406 smb->Mid, mid);
407 return 1;
408 }
409
410 /* if it's a response then accept */
411 if (smb->Flags & SMBFLG_RESPONSE)
412 return 0;
413
414 /* only one valid case where server sends us request */
415 if (smb->Command == SMB_COM_LOCKING_ANDX)
416 return 0;
417
418 cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return 1;
420}
421
422int
Steve Frenchd103e162006-10-12 17:49:24 +0000423checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000425 __u32 len = be32_to_cpu(smb->smb_buf_length);
Steve French190fdeb2005-10-10 11:48:26 -0700426 __u32 clc_len; /* calculated length */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000427 cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len);
Steve Frenchd103e162006-10-12 17:49:24 +0000428
Steve French630f3f0c2007-10-25 21:17:17 +0000429 if (length < 2 + sizeof(struct smb_hdr)) {
430 if ((length >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 && (smb->Status.CifsError != 0)) {
Steve Frenchd103e162006-10-12 17:49:24 +0000432 smb->WordCount = 0;
433 /* some error cases do not return wct and bcc */
434 return 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000435 } else if ((length == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000436 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000437 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000438 /* Need to work around a bug in two servers here */
439 /* First, check if the part of bcc they sent was zero */
440 if (tmp[sizeof(struct smb_hdr)] == 0) {
441 /* some servers return only half of bcc
442 * on simple responses (wct, bcc both zero)
443 * in particular have seen this on
444 * ulogoffX and FindClose. This leaves
445 * one byte of bcc potentially unitialized
446 */
447 /* zero rest of bcc */
448 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000449 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000451 cERROR(1, "rcvd invalid byte count (bcc)");
Steve Frenchd103e162006-10-12 17:49:24 +0000452 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000453 cERROR(1, "Length less than smb header size");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
Steve Frenchd103e162006-10-12 17:49:24 +0000455 return 1;
456 }
457 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000458 cERROR(1, "smb length greater than MaxBufSize, mid=%d",
459 smb->Mid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 return 1;
461 }
462
Jeff Layton68abaff2011-01-28 15:05:42 -0500463 if (check_smb_hdr(smb, mid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return 1;
Jeff Layton820a8032011-05-04 08:05:26 -0400465 clc_len = smbCalcSize(smb);
Steve French184ed212006-02-24 06:15:11 +0000466
Steve French790fe572007-07-07 19:25:05 +0000467 if (4 + len != length) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000468 cERROR(1, "Length read does not match RFC1001 length %d",
469 len);
Steve French184ed212006-02-24 06:15:11 +0000470 return 1;
471 }
472
473 if (4 + len != clc_len) {
474 /* check if bcc wrapped around for large read responses */
Steve French790fe572007-07-07 19:25:05 +0000475 if ((len > 64 * 1024) && (len > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000476 /* check if lengths match mod 64K */
Steve French790fe572007-07-07 19:25:05 +0000477 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000478 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000479 }
Jeff Layton62846442011-01-31 09:14:17 -0500480 cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000481 clc_len, 4 + len, smb->Mid);
Jeff Layton62846442011-01-31 09:14:17 -0500482
483 if (4 + len < clc_len) {
484 cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000485 len, smb->Mid);
Steve French190fdeb2005-10-10 11:48:26 -0700486 return 1;
Jeff Layton62846442011-01-31 09:14:17 -0500487 } else if (len > clc_len + 512) {
488 /*
489 * Some servers (Windows XP in particular) send more
490 * data than the lengths in the SMB packet would
491 * indicate on certain calls (byte range locks and
492 * trans2 find first calls in particular). While the
493 * client can handle such a frame by ignoring the
494 * trailing data, we choose limit the amount of extra
495 * data to 512 bytes.
496 */
497 cERROR(1, "RFC1001 size %u more than 512 bytes larger "
498 "than SMB for mid=%u", len, smb->Mid);
499 return 1;
Steve French46c79a62006-03-02 00:07:08 +0000500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
Steve French20962432005-09-21 22:05:57 -0700502 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503}
Steve French4b18f2a2008-04-29 00:06:05 +0000504
505bool
Steve Frenchd7c8c942006-03-03 10:43:49 +0000506is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000507{
508 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500509 struct list_head *tmp, *tmp1, *tmp2;
Steve French96daf2b2011-05-27 04:34:02 +0000510 struct cifs_ses *ses;
511 struct cifs_tcon *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500512 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 struct cifsFileInfo *netfile;
514
Joe Perchesb6b38f72010-04-21 03:50:45 +0000515 cFYI(1, "Checking for oplock break or dnotify response");
Steve French790fe572007-07-07 19:25:05 +0000516 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000518 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000520 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 __u32 data_offset = 0;
Jeff Layton820a8032011-05-04 08:05:26 -0400522 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 data_offset = le32_to_cpu(pSMBr->DataOffset);
524
Steve French39798772006-05-31 22:40:51 +0000525 pnotify = (struct file_notify_information *)
526 ((char *)&pSMBr->hdr.Protocol + data_offset);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000527 cFYI(1, "dnotify on %s Action: 0x%x",
528 pnotify->FileName, pnotify->Action);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000529 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000530 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000531 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
Steve French790fe572007-07-07 19:25:05 +0000533 if (pSMBr->hdr.Status.CifsError) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000534 cFYI(1, "notify err 0x%d",
535 pSMBr->hdr.Status.CifsError);
Steve French4b18f2a2008-04-29 00:06:05 +0000536 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 }
Steve French4b18f2a2008-04-29 00:06:05 +0000538 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000539 }
Steve French790fe572007-07-07 19:25:05 +0000540 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000541 return false;
Steve French790fe572007-07-07 19:25:05 +0000542 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 /* no sense logging error on invalid handle on oplock
544 break - harmless race between close request and oplock
545 break response is expected from time to time writing out
546 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000547 if ((NT_STATUS_INVALID_HANDLE) ==
548 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000549 cFYI(1, "invalid handle on oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000550 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000551 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000553 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000555 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
557 }
Steve French790fe572007-07-07 19:25:05 +0000558 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000559 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Joe Perchesb6b38f72010-04-21 03:50:45 +0000561 cFYI(1, "oplock type 0x%d level 0x%d",
562 pSMB->LockType, pSMB->OplockLevel);
Steve French790fe572007-07-07 19:25:05 +0000563 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000564 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 /* look up tcon based on tid & uid */
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530567 spin_lock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500568 list_for_each(tmp, &srv->smb_ses_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000569 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500570 list_for_each(tmp1, &ses->tcon_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000571 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500572 if (tcon->tid != buf->Tid)
573 continue;
574
Steve Frencha4544342005-08-24 13:59:35 -0700575 cifs_stats_inc(&tcon->num_oplock_brks);
Jeff Layton44772882010-10-15 15:34:03 -0400576 spin_lock(&cifs_file_list_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500577 list_for_each(tmp2, &tcon->openFileList) {
578 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700579 tlist);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500580 if (pSMB->Fid != netfile->netfid)
581 continue;
582
Joe Perchesb6b38f72010-04-21 03:50:45 +0000583 cFYI(1, "file id match, oplock break");
Jeff Laytona5e18bc2010-10-11 15:07:18 -0400584 pCifsInode = CIFS_I(netfile->dentry->d_inode);
Tejun Heo9b646972010-07-20 22:09:02 +0200585
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300586 cifs_set_oplock_level(pCifsInode,
Pavel Shilovsky12fed002011-01-17 20:15:44 +0300587 pSMB->OplockLevel ? OPLOCK_READ : 0);
Tejun Heo9b646972010-07-20 22:09:02 +0200588 /*
589 * cifs_oplock_break_put() can't be called
590 * from here. Get reference after queueing
591 * succeeded. cifs_oplock_break() will
Suresh Jayaraman6573e9b2010-10-18 23:52:18 +0530592 * synchronize using cifs_file_list_lock.
Tejun Heo9b646972010-07-20 22:09:02 +0200593 */
594 if (queue_work(system_nrt_wq,
595 &netfile->oplock_break))
596 cifs_oplock_break_get(netfile);
597 netfile->oplock_break_cancelled = false;
598
Jeff Layton44772882010-10-15 15:34:03 -0400599 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530600 spin_unlock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500601 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 }
Jeff Layton44772882010-10-15 15:34:03 -0400603 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530604 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000605 cFYI(1, "No matching file for oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000606 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
608 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530609 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000610 cFYI(1, "Can not process oplock break for non-existent connection");
Steve French4b18f2a2008-04-29 00:06:05 +0000611 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612}
613
614void
615dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
616{
617 int i, j;
618 char debug_line[17];
619 unsigned char *buffer;
620
621 if (traceSMB == 0)
622 return;
623
624 buffer = (unsigned char *) smb_buf;
625 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000626 if (i % 8 == 0) {
627 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 printk(KERN_DEBUG "| ");
629 j = 0;
630 }
631 printk("%0#4x ", buffer[i]);
632 debug_line[2 * j] = ' ';
633 if (isprint(buffer[i]))
634 debug_line[1 + (2 * j)] = buffer[i];
635 else
636 debug_line[1 + (2 * j)] = '_';
637
Steve Frenchad7a2922008-02-07 23:25:02 +0000638 if (i % 8 == 7) {
639 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 debug_line[16] = 0;
641 printk(" | %s\n", debug_line);
642 }
643 }
644 for (; j < 8; j++) {
645 printk(" ");
646 debug_line[2 * j] = ' ';
647 debug_line[1 + (2 * j)] = ' ';
648 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000649 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 return;
651}
Steve French6a0b4822005-04-28 22:41:05 -0700652
Jeff Laytonec06aed2009-11-06 14:18:29 -0500653void
654cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
655{
656 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
Suresh Jayaramanf534dc92009-11-16 12:03:16 +0530657 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000658 cERROR(1, "Autodisabling the use of server inode numbers on "
Jeff Laytonec06aed2009-11-06 14:18:29 -0500659 "%s. This server doesn't seem to support them "
660 "properly. Hardlinks will not be recognized on this "
661 "mount. Consider mounting with the \"noserverino\" "
662 "option to silence this message.",
Jeff Layton0d424ad2010-09-20 16:01:35 -0700663 cifs_sb_master_tcon(cifs_sb)->treeName);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500664 }
665}
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300666
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300667void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300668{
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300669 oplock &= 0xF;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300670
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300671 if (oplock == OPLOCK_EXCLUSIVE) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300672 cinode->clientCanCacheAll = true;
673 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300674 cFYI(1, "Exclusive Oplock granted on inode %p",
675 &cinode->vfs_inode);
676 } else if (oplock == OPLOCK_READ) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300677 cinode->clientCanCacheAll = false;
678 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300679 cFYI(1, "Level II Oplock granted on inode %p",
680 &cinode->vfs_inode);
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300681 } else {
682 cinode->clientCanCacheAll = false;
683 cinode->clientCanCacheRead = false;
684 }
685}