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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"
Pavel Shilovsky3792c172012-01-12 22:40:50 +040032#ifdef CONFIG_CIFS_SMB2
33#include "smb2pdu.h"
34#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36extern mempool_t *cifs_sm_req_poolp;
37extern mempool_t *cifs_req_poolp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Steve Frenchfb8c4b12007-07-10 01:16:18 +000039/* The xid serves as a useful identifier for each incoming vfs request,
40 in a similar way to the mid which is useful to track each sent smb,
41 and CurrentXid can also provide a running counter (although it
42 will eventually wrap past zero) of the total vfs operations handled
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 since the cifs fs was mounted */
44
45unsigned int
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +040046_get_xid(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 unsigned int xid;
49
50 spin_lock(&GlobalMid_Lock);
51 GlobalTotalActiveXid++;
Steve French50c2f752007-07-13 00:33:32 +000052
53 /* keep high water mark for number of simultaneous ops in filesystem */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
Steve French50c2f752007-07-13 00:33:32 +000055 GlobalMaxActiveXid = GlobalTotalActiveXid;
Steve French790fe572007-07-07 19:25:05 +000056 if (GlobalTotalActiveXid > 65000)
Joe Perchesb6b38f72010-04-21 03:50:45 +000057 cFYI(1, "warning: more than 65000 requests active");
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 xid = GlobalCurrentXid++;
59 spin_unlock(&GlobalMid_Lock);
60 return xid;
61}
62
63void
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +040064_free_xid(unsigned int xid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 spin_lock(&GlobalMid_Lock);
Steve French790fe572007-07-07 19:25:05 +000067 /* if (GlobalTotalActiveXid == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 BUG(); */
69 GlobalTotalActiveXid--;
70 spin_unlock(&GlobalMid_Lock);
71}
72
Steve French96daf2b2011-05-27 04:34:02 +000073struct cifs_ses *
Linus Torvalds1da177e2005-04-16 15:20:36 -070074sesInfoAlloc(void)
75{
Steve French96daf2b2011-05-27 04:34:02 +000076 struct cifs_ses *ret_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Steve French96daf2b2011-05-27 04:34:02 +000078 ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 atomic_inc(&sesInfoAllocCount);
81 ret_buf->status = CifsNew;
Jeff Layton14fbf502008-11-14 13:53:46 -050082 ++ret_buf->ses_count;
83 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -050084 INIT_LIST_HEAD(&ret_buf->tcon_list);
Steve Frenchd7b619c2010-02-25 05:36:46 +000085 mutex_init(&ret_buf->session_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87 return ret_buf;
88}
89
90void
Steve French96daf2b2011-05-27 04:34:02 +000091sesInfoFree(struct cifs_ses *buf_to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +000094 cFYI(1, "Null buffer passed to sesInfoFree");
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 return;
96 }
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 atomic_dec(&sesInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -080099 kfree(buf_to_free->serverOS);
100 kfree(buf_to_free->serverDomain);
101 kfree(buf_to_free->serverNOS);
Jeff Layton55162de2008-12-05 20:41:21 -0500102 if (buf_to_free->password) {
103 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
104 kfree(buf_to_free->password);
105 }
Steve French8727c8a2011-02-25 01:11:56 -0600106 kfree(buf_to_free->user_name);
Steve French39798772006-05-31 22:40:51 +0000107 kfree(buf_to_free->domainName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 kfree(buf_to_free);
109}
110
Steve French96daf2b2011-05-27 04:34:02 +0000111struct cifs_tcon *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112tconInfoAlloc(void)
113{
Steve French96daf2b2011-05-27 04:34:02 +0000114 struct cifs_tcon *ret_buf;
115 ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 atomic_inc(&tconInfoAllocCount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 ret_buf->tidStatus = CifsNew;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500119 ++ret_buf->tc_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 INIT_LIST_HEAD(&ret_buf->openFileList);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500121 INIT_LIST_HEAD(&ret_buf->tcon_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#ifdef CONFIG_CIFS_STATS
123 spin_lock_init(&ret_buf->stat_lock);
124#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 }
126 return ret_buf;
127}
128
129void
Steve French96daf2b2011-05-27 04:34:02 +0000130tconInfoFree(struct cifs_tcon *buf_to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000133 cFYI(1, "Null buffer passed to tconInfoFree");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return;
135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 atomic_dec(&tconInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800137 kfree(buf_to_free->nativeFileSystem);
Jeff Layton00e485b2008-12-05 20:41:21 -0500138 if (buf_to_free->password) {
139 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
140 kfree(buf_to_free->password);
141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 kfree(buf_to_free);
143}
144
145struct smb_hdr *
146cifs_buf_get(void)
147{
148 struct smb_hdr *ret_buf = NULL;
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400149 size_t buf_size = sizeof(struct smb_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400151#ifdef CONFIG_CIFS_SMB2
152 /*
153 * SMB2 header is bigger than CIFS one - no problems to clean some
154 * more bytes for CIFS.
155 */
156 buf_size = sizeof(struct smb2_hdr);
157#endif
158 /*
159 * We could use negotiated size instead of max_msgsize -
160 * but it may be more efficient to always alloc same size
161 * albeit slightly larger than necessary and maxbuffersize
162 * defaults to this and can not be bigger.
163 */
Pekka Enberg232087c2008-09-15 13:22:54 +0300164 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 /* clear the first few header bytes */
167 /* for most paths, more is cleared in header_assemble */
168 if (ret_buf) {
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400169 memset(ret_buf, 0, buf_size + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 atomic_inc(&bufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800171#ifdef CONFIG_CIFS_STATS2
172 atomic_inc(&totBufAllocCount);
173#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
175
176 return ret_buf;
177}
178
179void
180cifs_buf_release(void *buf_to_free)
181{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000183 /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return;
185 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000186 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 atomic_dec(&bufAllocCount);
189 return;
190}
191
192struct smb_hdr *
193cifs_small_buf_get(void)
194{
195 struct smb_hdr *ret_buf = NULL;
196
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000197/* We could use negotiated size instead of max_msgsize -
198 but it may be more efficient to always alloc same size
199 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300201 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (ret_buf) {
203 /* No need to clear memory here, cleared in header assemble */
204 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
205 atomic_inc(&smBufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800206#ifdef CONFIG_CIFS_STATS2
207 atomic_inc(&totSmBufAllocCount);
208#endif /* CONFIG_CIFS_STATS2 */
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211 return ret_buf;
212}
213
214void
215cifs_small_buf_release(void *buf_to_free)
216{
217
218 if (buf_to_free == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000219 cFYI(1, "Null buffer passed to cifs_small_buf_release");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return;
221 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000222 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 atomic_dec(&smBufAllocCount);
225 return;
226}
227
Steve French1982c342005-08-17 12:38:22 -0700228/* NB: MID can not be set if treeCon not passed in, in that
229 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230void
231header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
Steve French96daf2b2011-05-27 04:34:02 +0000232 const struct cifs_tcon *treeCon, int word_count
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 /* length of fixed section (word count) in two byte units */)
234{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 char *temp = (char *) buffer;
236
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000237 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000239 buffer->smb_buf_length = cpu_to_be32(
Steve French630f3f0c2007-10-25 21:17:17 +0000240 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 4 /* RFC 1001 length field does not count */ +
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000242 2 /* for bcc field itself */) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244 buffer->Protocol[0] = 0xFF;
245 buffer->Protocol[1] = 'S';
246 buffer->Protocol[2] = 'M';
247 buffer->Protocol[3] = 'B';
248 buffer->Command = smb_command;
249 buffer->Flags = 0x00; /* case sensitive */
250 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
251 buffer->Pid = cpu_to_le16((__u16)current->tgid);
252 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (treeCon) {
254 buffer->Tid = treeCon->tid;
255 if (treeCon->ses) {
256 if (treeCon->ses->capabilities & CAP_UNICODE)
257 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000258 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000260
Steve French1982c342005-08-17 12:38:22 -0700261 /* Uid is not converted */
262 buffer->Uid = treeCon->ses->Suid;
Pavel Shilovsky88257362012-05-23 14:01:59 +0400263 buffer->Mid = get_next_mid(treeCon->ses->server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 }
265 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
266 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700267 if (treeCon->nocase)
268 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000269 if ((treeCon->ses) && (treeCon->ses->server))
Steve French96daf2b2011-05-27 04:34:02 +0000270 if (treeCon->ses->server->sec_mode &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
272 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
273 }
274
275/* endian conversion of flags is now done just before sending */
276 buffer->WordCount = (char) word_count;
277 return;
278}
279
Steve French2cd646a2006-09-28 19:43:08 +0000280static int
Jeff Layton68abaff2011-01-28 15:05:42 -0500281check_smb_hdr(struct smb_hdr *smb, __u16 mid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
Jeff Layton68abaff2011-01-28 15:05:42 -0500283 /* does it have the right SMB "signature" ? */
284 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
285 cERROR(1, "Bad protocol string signature header 0x%x",
286 *(unsigned int *)smb->Protocol);
287 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
Jeff Layton68abaff2011-01-28 15:05:42 -0500289
290 /* Make sure that message ids match */
291 if (mid != smb->Mid) {
292 cERROR(1, "Mids do not match. received=%u expected=%u",
293 smb->Mid, mid);
294 return 1;
295 }
296
297 /* if it's a response then accept */
298 if (smb->Flags & SMBFLG_RESPONSE)
299 return 0;
300
301 /* only one valid case where server sends us request */
302 if (smb->Command == SMB_COM_LOCKING_ANDX)
303 return 0;
304
305 cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return 1;
307}
308
309int
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400310checkSMB(char *buf, unsigned int total_read)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400312 struct smb_hdr *smb = (struct smb_hdr *)buf;
313 __u16 mid = smb->Mid;
Jeff Layton376b43f2011-10-11 06:41:32 -0400314 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
Steve French190fdeb2005-10-10 11:48:26 -0700315 __u32 clc_len; /* calculated length */
Jeff Layton376b43f2011-10-11 06:41:32 -0400316 cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x",
317 total_read, rfclen);
Steve Frenchd103e162006-10-12 17:49:24 +0000318
Jeff Layton376b43f2011-10-11 06:41:32 -0400319 /* is this frame too small to even get to a BCC? */
320 if (total_read < 2 + sizeof(struct smb_hdr)) {
321 if ((total_read >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 && (smb->Status.CifsError != 0)) {
Jeff Layton376b43f2011-10-11 06:41:32 -0400323 /* it's an error return */
Steve Frenchd103e162006-10-12 17:49:24 +0000324 smb->WordCount = 0;
325 /* some error cases do not return wct and bcc */
326 return 0;
Jeff Layton376b43f2011-10-11 06:41:32 -0400327 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000328 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000329 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000330 /* Need to work around a bug in two servers here */
331 /* First, check if the part of bcc they sent was zero */
332 if (tmp[sizeof(struct smb_hdr)] == 0) {
333 /* some servers return only half of bcc
334 * on simple responses (wct, bcc both zero)
335 * in particular have seen this on
336 * ulogoffX and FindClose. This leaves
337 * one byte of bcc potentially unitialized
338 */
339 /* zero rest of bcc */
340 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000341 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000343 cERROR(1, "rcvd invalid byte count (bcc)");
Steve Frenchd103e162006-10-12 17:49:24 +0000344 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000345 cERROR(1, "Length less than smb header size");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
Jeff Layton376b43f2011-10-11 06:41:32 -0400347 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
349
Jeff Layton376b43f2011-10-11 06:41:32 -0400350 /* otherwise, there is enough to get to the BCC */
Jeff Layton68abaff2011-01-28 15:05:42 -0500351 if (check_smb_hdr(smb, mid))
Jeff Layton376b43f2011-10-11 06:41:32 -0400352 return -EIO;
Jeff Layton820a8032011-05-04 08:05:26 -0400353 clc_len = smbCalcSize(smb);
Steve French184ed212006-02-24 06:15:11 +0000354
Jeff Layton376b43f2011-10-11 06:41:32 -0400355 if (4 + rfclen != total_read) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000356 cERROR(1, "Length read does not match RFC1001 length %d",
Jeff Layton376b43f2011-10-11 06:41:32 -0400357 rfclen);
358 return -EIO;
Steve French184ed212006-02-24 06:15:11 +0000359 }
360
Jeff Layton376b43f2011-10-11 06:41:32 -0400361 if (4 + rfclen != clc_len) {
Steve French184ed212006-02-24 06:15:11 +0000362 /* check if bcc wrapped around for large read responses */
Jeff Layton376b43f2011-10-11 06:41:32 -0400363 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000364 /* check if lengths match mod 64K */
Jeff Layton376b43f2011-10-11 06:41:32 -0400365 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000366 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000367 }
Jeff Layton62846442011-01-31 09:14:17 -0500368 cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
Jeff Layton376b43f2011-10-11 06:41:32 -0400369 clc_len, 4 + rfclen, smb->Mid);
Jeff Layton62846442011-01-31 09:14:17 -0500370
Jeff Layton376b43f2011-10-11 06:41:32 -0400371 if (4 + rfclen < clc_len) {
Jeff Layton62846442011-01-31 09:14:17 -0500372 cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
Jeff Layton376b43f2011-10-11 06:41:32 -0400373 rfclen, smb->Mid);
374 return -EIO;
375 } else if (rfclen > clc_len + 512) {
Jeff Layton62846442011-01-31 09:14:17 -0500376 /*
377 * Some servers (Windows XP in particular) send more
378 * data than the lengths in the SMB packet would
379 * indicate on certain calls (byte range locks and
380 * trans2 find first calls in particular). While the
381 * client can handle such a frame by ignoring the
382 * trailing data, we choose limit the amount of extra
383 * data to 512 bytes.
384 */
385 cERROR(1, "RFC1001 size %u more than 512 bytes larger "
Jeff Layton376b43f2011-10-11 06:41:32 -0400386 "than SMB for mid=%u", rfclen, smb->Mid);
387 return -EIO;
Steve French46c79a62006-03-02 00:07:08 +0000388 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 }
Steve French20962432005-09-21 22:05:57 -0700390 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
Steve French4b18f2a2008-04-29 00:06:05 +0000392
393bool
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400394is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000395{
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400396 struct smb_hdr *buf = (struct smb_hdr *)buffer;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000397 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500398 struct list_head *tmp, *tmp1, *tmp2;
Steve French96daf2b2011-05-27 04:34:02 +0000399 struct cifs_ses *ses;
400 struct cifs_tcon *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500401 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 struct cifsFileInfo *netfile;
403
Joe Perchesb6b38f72010-04-21 03:50:45 +0000404 cFYI(1, "Checking for oplock break or dnotify response");
Steve French790fe572007-07-07 19:25:05 +0000405 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000407 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000409 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 __u32 data_offset = 0;
Jeff Layton820a8032011-05-04 08:05:26 -0400411 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 data_offset = le32_to_cpu(pSMBr->DataOffset);
413
Steve French39798772006-05-31 22:40:51 +0000414 pnotify = (struct file_notify_information *)
415 ((char *)&pSMBr->hdr.Protocol + data_offset);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000416 cFYI(1, "dnotify on %s Action: 0x%x",
417 pnotify->FileName, pnotify->Action);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000418 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000419 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000420 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 }
Steve French790fe572007-07-07 19:25:05 +0000422 if (pSMBr->hdr.Status.CifsError) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000423 cFYI(1, "notify err 0x%d",
424 pSMBr->hdr.Status.CifsError);
Steve French4b18f2a2008-04-29 00:06:05 +0000425 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
Steve French4b18f2a2008-04-29 00:06:05 +0000427 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000428 }
Steve French790fe572007-07-07 19:25:05 +0000429 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000430 return false;
Steve French790fe572007-07-07 19:25:05 +0000431 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 /* no sense logging error on invalid handle on oplock
433 break - harmless race between close request and oplock
434 break response is expected from time to time writing out
435 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000436 if ((NT_STATUS_INVALID_HANDLE) ==
437 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000438 cFYI(1, "invalid handle on oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000439 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000440 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000442 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000444 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 }
446 }
Steve French790fe572007-07-07 19:25:05 +0000447 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000448 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Joe Perchesb6b38f72010-04-21 03:50:45 +0000450 cFYI(1, "oplock type 0x%d level 0x%d",
451 pSMB->LockType, pSMB->OplockLevel);
Steve French790fe572007-07-07 19:25:05 +0000452 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000453 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 /* look up tcon based on tid & uid */
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530456 spin_lock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500457 list_for_each(tmp, &srv->smb_ses_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000458 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500459 list_for_each(tmp1, &ses->tcon_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000460 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500461 if (tcon->tid != buf->Tid)
462 continue;
463
Pavel Shilovsky44c58182012-05-28 14:16:31 +0400464 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
Jeff Layton44772882010-10-15 15:34:03 -0400465 spin_lock(&cifs_file_list_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500466 list_for_each(tmp2, &tcon->openFileList) {
467 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700468 tlist);
Pavel Shilovsky4b4de762012-09-18 16:20:26 -0700469 if (pSMB->Fid != netfile->fid.netfid)
Jeff Laytonf1987b42008-11-15 11:12:47 -0500470 continue;
471
Joe Perchesb6b38f72010-04-21 03:50:45 +0000472 cFYI(1, "file id match, oplock break");
Jeff Laytona5e18bc2010-10-11 15:07:18 -0400473 pCifsInode = CIFS_I(netfile->dentry->d_inode);
Tejun Heo9b646972010-07-20 22:09:02 +0200474
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300475 cifs_set_oplock_level(pCifsInode,
Pavel Shilovsky12fed002011-01-17 20:15:44 +0300476 pSMB->OplockLevel ? OPLOCK_READ : 0);
Jeff Laytonda472fc2012-03-23 14:40:53 -0400477 queue_work(cifsiod_wq,
Jeff Laytonad635942011-07-26 12:20:17 -0400478 &netfile->oplock_break);
Tejun Heo9b646972010-07-20 22:09:02 +0200479 netfile->oplock_break_cancelled = false;
480
Jeff Layton44772882010-10-15 15:34:03 -0400481 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530482 spin_unlock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500483 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 }
Jeff Layton44772882010-10-15 15:34:03 -0400485 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530486 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000487 cFYI(1, "No matching file for oplock break");
Steve French4b18f2a2008-04-29 00:06:05 +0000488 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
490 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530491 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000492 cFYI(1, "Can not process oplock break for non-existent connection");
Steve French4b18f2a2008-04-29 00:06:05 +0000493 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
496void
Pavel Shilovsky792af7b2012-03-23 14:28:02 -0400497dump_smb(void *buf, int smb_buf_length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
499 int i, j;
500 char debug_line[17];
Pavel Shilovsky792af7b2012-03-23 14:28:02 -0400501 unsigned char *buffer = buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
503 if (traceSMB == 0)
504 return;
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000507 if (i % 8 == 0) {
508 /* have reached the beginning of line */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 printk(KERN_DEBUG "| ");
510 j = 0;
511 }
512 printk("%0#4x ", buffer[i]);
513 debug_line[2 * j] = ' ';
514 if (isprint(buffer[i]))
515 debug_line[1 + (2 * j)] = buffer[i];
516 else
517 debug_line[1 + (2 * j)] = '_';
518
Steve Frenchad7a2922008-02-07 23:25:02 +0000519 if (i % 8 == 7) {
520 /* reached end of line, time to print ascii */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 debug_line[16] = 0;
522 printk(" | %s\n", debug_line);
523 }
524 }
525 for (; j < 8; j++) {
526 printk(" ");
527 debug_line[2 * j] = ' ';
528 debug_line[1 + (2 * j)] = ' ';
529 }
Steve Frenchad7a2922008-02-07 23:25:02 +0000530 printk(" | %s\n", debug_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return;
532}
Steve French6a0b4822005-04-28 22:41:05 -0700533
Jeff Laytonec06aed2009-11-06 14:18:29 -0500534void
535cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
536{
537 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
Suresh Jayaramanf534dc92009-11-16 12:03:16 +0530538 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000539 cERROR(1, "Autodisabling the use of server inode numbers on "
Jeff Laytonec06aed2009-11-06 14:18:29 -0500540 "%s. This server doesn't seem to support them "
541 "properly. Hardlinks will not be recognized on this "
542 "mount. Consider mounting with the \"noserverino\" "
543 "option to silence this message.",
Jeff Layton0d424ad2010-09-20 16:01:35 -0700544 cifs_sb_master_tcon(cifs_sb)->treeName);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500545 }
546}
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300547
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300548void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300549{
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300550 oplock &= 0xF;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300551
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300552 if (oplock == OPLOCK_EXCLUSIVE) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300553 cinode->clientCanCacheAll = true;
554 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300555 cFYI(1, "Exclusive Oplock granted on inode %p",
556 &cinode->vfs_inode);
557 } else if (oplock == OPLOCK_READ) {
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300558 cinode->clientCanCacheAll = false;
559 cinode->clientCanCacheRead = true;
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300560 cFYI(1, "Level II Oplock granted on inode %p",
561 &cinode->vfs_inode);
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300562 } else {
563 cinode->clientCanCacheAll = false;
564 cinode->clientCanCacheRead = false;
565 }
566}
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500567
568bool
569backup_cred(struct cifs_sb_info *cifs_sb)
570{
571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
572 if (cifs_sb->mnt_backupuid == current_fsuid())
573 return true;
574 }
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
576 if (in_group_p(cifs_sb->mnt_backupgid))
577 return true;
578 }
579
580 return false;
581}