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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 French4498eed2005-12-03 13:58:57 -0800158#ifdef CONFIG_CIFS_STATS2
159 atomic_inc(&totBufAllocCount);
160#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 }
162
163 return ret_buf;
164}
165
166void
167cifs_buf_release(void *buf_to_free)
168{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (buf_to_free == NULL) {
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 French4498eed2005-12-03 13:58:57 -0800193#ifdef CONFIG_CIFS_STATS2
194 atomic_inc(&totSmBufAllocCount);
195#endif /* CONFIG_CIFS_STATS2 */
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 }
198 return ret_buf;
199}
200
201void
202cifs_small_buf_release(void *buf_to_free)
203{
204
205 if (buf_to_free == NULL) {
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 French630f3f02007-10-25 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
Jeff Layton376b43f2011-10-11 06:41:32 -0400423checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int total_read)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Jeff Layton376b43f2011-10-11 06:41:32 -0400425 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
Steve French190fdeb2005-10-10 11:48:26 -0700426 __u32 clc_len; /* calculated length */
Jeff Layton376b43f2011-10-11 06:41:32 -0400427 cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x",
428 total_read, rfclen);
Steve Frenchd103e162006-10-12 17:49:24 +0000429
Jeff Layton376b43f2011-10-11 06:41:32 -0400430 /* is this frame too small to even get to a BCC? */
431 if (total_read < 2 + sizeof(struct smb_hdr)) {
432 if ((total_read >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 && (smb->Status.CifsError != 0)) {
Jeff Layton376b43f2011-10-11 06:41:32 -0400434 /* it's an error return */
Steve Frenchd103e162006-10-12 17:49:24 +0000435 smb->WordCount = 0;
436 /* some error cases do not return wct and bcc */
437 return 0;
Jeff Layton376b43f2011-10-11 06:41:32 -0400438 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000439 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000440 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000441 /* Need to work around a bug in two servers here */
442 /* First, check if the part of bcc they sent was zero */
443 if (tmp[sizeof(struct smb_hdr)] == 0) {
444 /* some servers return only half of bcc
445 * on simple responses (wct, bcc both zero)
446 * in particular have seen this on
447 * ulogoffX and FindClose. This leaves
448 * one byte of bcc potentially unitialized
449 */
450 /* zero rest of bcc */
451 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000452 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000454 cERROR(1, "rcvd invalid byte count (bcc)");
Steve Frenchd103e162006-10-12 17:49:24 +0000455 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000456 cERROR(1, "Length less than smb header size");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 }
Jeff Layton376b43f2011-10-11 06:41:32 -0400458 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
Jeff Layton376b43f2011-10-11 06:41:32 -0400461 /* otherwise, there is enough to get to the BCC */
Jeff Layton68abaff2011-01-28 15:05:42 -0500462 if (check_smb_hdr(smb, mid))
Jeff Layton376b43f2011-10-11 06:41:32 -0400463 return -EIO;
Jeff Layton820a8032011-05-04 08:05:26 -0400464 clc_len = smbCalcSize(smb);
Steve French184ed212006-02-24 06:15:11 +0000465
Jeff Layton376b43f2011-10-11 06:41:32 -0400466 if (4 + rfclen != total_read) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000467 cERROR(1, "Length read does not match RFC1001 length %d",
Jeff Layton376b43f2011-10-11 06:41:32 -0400468 rfclen);
469 return -EIO;
Steve French184ed212006-02-24 06:15:11 +0000470 }
471
Jeff Layton376b43f2011-10-11 06:41:32 -0400472 if (4 + rfclen != clc_len) {
Steve French184ed212006-02-24 06:15:11 +0000473 /* check if bcc wrapped around for large read responses */
Jeff Layton376b43f2011-10-11 06:41:32 -0400474 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000475 /* check if lengths match mod 64K */
Jeff Layton376b43f2011-10-11 06:41:32 -0400476 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000477 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000478 }
Jeff Layton62846442011-01-31 09:14:17 -0500479 cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
Jeff Layton376b43f2011-10-11 06:41:32 -0400480 clc_len, 4 + rfclen, smb->Mid);
Jeff Layton62846442011-01-31 09:14:17 -0500481
Jeff Layton376b43f2011-10-11 06:41:32 -0400482 if (4 + rfclen < clc_len) {
Jeff Layton62846442011-01-31 09:14:17 -0500483 cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
Jeff Layton376b43f2011-10-11 06:41:32 -0400484 rfclen, smb->Mid);
485 return -EIO;
486 } else if (rfclen > clc_len + 512) {
Jeff Layton62846442011-01-31 09:14:17 -0500487 /*
488 * Some servers (Windows XP in particular) send more
489 * data than the lengths in the SMB packet would
490 * indicate on certain calls (byte range locks and
491 * trans2 find first calls in particular). While the
492 * client can handle such a frame by ignoring the
493 * trailing data, we choose limit the amount of extra
494 * data to 512 bytes.
495 */
496 cERROR(1, "RFC1001 size %u more than 512 bytes larger "
Jeff Layton376b43f2011-10-11 06:41:32 -0400497 "than SMB for mid=%u", rfclen, smb->Mid);
498 return -EIO;
Steve French46c79a62006-03-02 00:07:08 +0000499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
Steve French20962432005-09-21 22:05:57 -0700501 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
Steve French4b18f2a2008-04-29 00:06:05 +0000503
504bool
Steve Frenchd7c8c942006-03-03 10:43:49 +0000505is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000506{
507 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500508 struct list_head *tmp, *tmp1, *tmp2;
Steve French96daf2b2011-05-27 04:34:02 +0000509 struct cifs_ses *ses;
510 struct cifs_tcon *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500511 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 struct cifsFileInfo *netfile;
513
Joe Perchesb6b38f72010-04-21 03:50:45 +0000514 cFYI(1, "Checking for oplock break or dnotify response");
Steve French790fe572007-07-07 19:25:05 +0000515 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000517 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000519 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 __u32 data_offset = 0;
Jeff Layton820a8032011-05-04 08:05:26 -0400521 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 data_offset = le32_to_cpu(pSMBr->DataOffset);
523
Steve French39798772006-05-31 22:40:51 +0000524 pnotify = (struct file_notify_information *)
525 ((char *)&pSMBr->hdr.Protocol + data_offset);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000526 cFYI(1, "dnotify on %s Action: 0x%x",
527 pnotify->FileName, pnotify->Action);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000528 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000529 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000530 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
Steve French790fe572007-07-07 19:25:05 +0000532 if (pSMBr->hdr.Status.CifsError) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000533 cFYI(1, "notify err 0x%d",
534 pSMBr->hdr.Status.CifsError);
Steve French4b18f2a2008-04-29 00:06:05 +0000535 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
Steve French4b18f2a2008-04-29 00:06:05 +0000537 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000538 }
Steve French790fe572007-07-07 19:25:05 +0000539 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000540 return false;
Steve French790fe572007-07-07 19:25:05 +0000541 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 /* no sense logging error on invalid handle on oplock
543 break - harmless race between close request and oplock
544 break response is expected from time to time writing out
545 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000546 if ((NT_STATUS_INVALID_HANDLE) ==
547 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000548 cFYI(1, "invalid handle on oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000549 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000550 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000552 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000554 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 }
556 }
Steve French790fe572007-07-07 19:25:05 +0000557 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000558 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Joe Perchesb6b38f72010-04-21 03:50:45 +0000560 cFYI(1, "oplock type 0x%d level 0x%d",
561 pSMB->LockType, pSMB->OplockLevel);
Steve French790fe572007-07-07 19:25:05 +0000562 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000563 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 /* look up tcon based on tid & uid */
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530566 spin_lock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500567 list_for_each(tmp, &srv->smb_ses_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000568 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500569 list_for_each(tmp1, &ses->tcon_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000570 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500571 if (tcon->tid != buf->Tid)
572 continue;
573
Steve Frencha4544342005-08-24 13:59:35 -0700574 cifs_stats_inc(&tcon->num_oplock_brks);
Jeff Layton44772882010-10-15 15:34:03 -0400575 spin_lock(&cifs_file_list_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500576 list_for_each(tmp2, &tcon->openFileList) {
577 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700578 tlist);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500579 if (pSMB->Fid != netfile->netfid)
580 continue;
581
Joe Perchesb6b38f72010-04-21 03:50:45 +0000582 cFYI(1, "file id match, oplock break");
Jeff Laytona5e18bc2010-10-11 15:07:18 -0400583 pCifsInode = CIFS_I(netfile->dentry->d_inode);
Tejun Heo9b646972010-07-20 22:09:02 +0200584
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300585 cifs_set_oplock_level(pCifsInode,
Pavel Shilovsky12fed002011-01-17 20:15:44 +0300586 pSMB->OplockLevel ? OPLOCK_READ : 0);
Jeff Laytonad635942011-07-26 12:20:17 -0400587 queue_work(system_nrt_wq,
588 &netfile->oplock_break);
Tejun Heo9b646972010-07-20 22:09:02 +0200589 netfile->oplock_break_cancelled = false;
590
Jeff Layton44772882010-10-15 15:34:03 -0400591 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530592 spin_unlock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500593 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 }
Jeff Layton44772882010-10-15 15:34:03 -0400595 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530596 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000597 cFYI(1, "No matching file for oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000598 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 }
600 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530601 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000602 cFYI(1, "Can not process oplock break for non-existent connection");
Steve French4b18f2a2008-04-29 00:06:05 +0000603 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
605
606void
607dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
608{
609 int i, j;
610 char debug_line[17];
611 unsigned char *buffer;
612
613 if (traceSMB == 0)
614 return;
615
616 buffer = (unsigned char *) smb_buf;
617 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000618 if (i % 8 == 0) {
619 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 printk(KERN_DEBUG "| ");
621 j = 0;
622 }
623 printk("%0#4x ", buffer[i]);
624 debug_line[2 * j] = ' ';
625 if (isprint(buffer[i]))
626 debug_line[1 + (2 * j)] = buffer[i];
627 else
628 debug_line[1 + (2 * j)] = '_';
629
Steve Frenchad7a2922008-02-07 23:25:02 +0000630 if (i % 8 == 7) {
631 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 debug_line[16] = 0;
633 printk(" | %s\n", debug_line);
634 }
635 }
636 for (; j < 8; j++) {
637 printk(" ");
638 debug_line[2 * j] = ' ';
639 debug_line[1 + (2 * j)] = ' ';
640 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000641 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 return;
643}
Steve French6a0b4822005-04-28 22:41:05 -0700644
Jeff Laytonec06aed2009-11-06 14:18:29 -0500645void
646cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
647{
648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
Suresh Jayaramanf534dc92009-11-16 12:03:16 +0530649 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000650 cERROR(1, "Autodisabling the use of server inode numbers on "
Jeff Laytonec06aed2009-11-06 14:18:29 -0500651 "%s. This server doesn't seem to support them "
652 "properly. Hardlinks will not be recognized on this "
653 "mount. Consider mounting with the \"noserverino\" "
654 "option to silence this message.",
Jeff Layton0d424ad2010-09-20 16:01:35 -0700655 cifs_sb_master_tcon(cifs_sb)->treeName);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500656 }
657}
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300658
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300659void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300660{
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300661 oplock &= 0xF;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300662
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300663 if (oplock == OPLOCK_EXCLUSIVE) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300664 cinode->clientCanCacheAll = true;
665 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300666 cFYI(1, "Exclusive Oplock granted on inode %p",
667 &cinode->vfs_inode);
668 } else if (oplock == OPLOCK_READ) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300669 cinode->clientCanCacheAll = false;
670 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300671 cFYI(1, "Level II Oplock granted on inode %p",
672 &cinode->vfs_inode);
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300673 } else {
674 cinode->clientCanCacheAll = false;
675 cinode->clientCanCacheRead = false;
676 }
677}
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500678
679bool
680backup_cred(struct cifs_sb_info *cifs_sb)
681{
682 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
683 if (cifs_sb->mnt_backupuid == current_fsuid())
684 return true;
685 }
686 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
687 if (in_group_p(cifs_sb->mnt_backupgid))
688 return true;
689 }
690
691 return false;
692}