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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 Perchesf96637b2013-05-04 22:12:25 -050057 cifs_dbg(FYI, "warning: more than 65000 requests active\n");
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 Perchesf96637b2013-05-04 22:12:25 -050094 cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
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);
Shirish Pargaonkard4e63bd2013-08-29 08:35:09 -0500108 kfree(buf_to_free->auth_key.response);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 kfree(buf_to_free);
110}
111
Steve French96daf2b2011-05-27 04:34:02 +0000112struct cifs_tcon *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113tconInfoAlloc(void)
114{
Steve French96daf2b2011-05-27 04:34:02 +0000115 struct cifs_tcon *ret_buf;
116 ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (ret_buf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 atomic_inc(&tconInfoAllocCount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 ret_buf->tidStatus = CifsNew;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500120 ++ret_buf->tc_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 INIT_LIST_HEAD(&ret_buf->openFileList);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500122 INIT_LIST_HEAD(&ret_buf->tcon_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#ifdef CONFIG_CIFS_STATS
124 spin_lock_init(&ret_buf->stat_lock);
125#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
127 return ret_buf;
128}
129
130void
Steve French96daf2b2011-05-27 04:34:02 +0000131tconInfoFree(struct cifs_tcon *buf_to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 if (buf_to_free == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500134 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return;
136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 atomic_dec(&tconInfoAllocCount);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800138 kfree(buf_to_free->nativeFileSystem);
Jeff Layton00e485b2008-12-05 20:41:21 -0500139 if (buf_to_free->password) {
140 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
141 kfree(buf_to_free->password);
142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 kfree(buf_to_free);
144}
145
146struct smb_hdr *
147cifs_buf_get(void)
148{
149 struct smb_hdr *ret_buf = NULL;
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400150 size_t buf_size = sizeof(struct smb_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400152#ifdef CONFIG_CIFS_SMB2
153 /*
154 * SMB2 header is bigger than CIFS one - no problems to clean some
155 * more bytes for CIFS.
156 */
157 buf_size = sizeof(struct smb2_hdr);
158#endif
159 /*
160 * We could use negotiated size instead of max_msgsize -
161 * but it may be more efficient to always alloc same size
162 * albeit slightly larger than necessary and maxbuffersize
163 * defaults to this and can not be bigger.
164 */
Pekka Enberg232087c2008-09-15 13:22:54 +0300165 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 /* clear the first few header bytes */
168 /* for most paths, more is cleared in header_assemble */
169 if (ret_buf) {
Pavel Shilovsky3792c172012-01-12 22:40:50 +0400170 memset(ret_buf, 0, buf_size + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 atomic_inc(&bufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800172#ifdef CONFIG_CIFS_STATS2
173 atomic_inc(&totBufAllocCount);
174#endif /* CONFIG_CIFS_STATS2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176
177 return ret_buf;
178}
179
180void
181cifs_buf_release(void *buf_to_free)
182{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (buf_to_free == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500184 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return;
186 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000187 mempool_free(buf_to_free, cifs_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 atomic_dec(&bufAllocCount);
190 return;
191}
192
193struct smb_hdr *
194cifs_small_buf_get(void)
195{
196 struct smb_hdr *ret_buf = NULL;
197
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000198/* We could use negotiated size instead of max_msgsize -
199 but it may be more efficient to always alloc same size
200 albeit slightly larger than necessary and maxbuffersize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 defaults to this and can not be bigger */
Pekka Enberg232087c2008-09-15 13:22:54 +0300202 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (ret_buf) {
204 /* No need to clear memory here, cleared in header assemble */
205 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
206 atomic_inc(&smBufAllocCount);
Steve French4498eed52005-12-03 13:58:57 -0800207#ifdef CONFIG_CIFS_STATS2
208 atomic_inc(&totSmBufAllocCount);
209#endif /* CONFIG_CIFS_STATS2 */
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
212 return ret_buf;
213}
214
215void
216cifs_small_buf_release(void *buf_to_free)
217{
218
219 if (buf_to_free == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500220 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return;
222 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000223 mempool_free(buf_to_free, cifs_sm_req_poolp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 atomic_dec(&smBufAllocCount);
226 return;
227}
228
Sachin Prabhu6d81ed12014-06-16 15:35:24 +0100229void
230free_rsp_buf(int resp_buftype, void *rsp)
231{
232 if (resp_buftype == CIFS_SMALL_BUFFER)
233 cifs_small_buf_release(rsp);
234 else if (resp_buftype == CIFS_LARGE_BUFFER)
235 cifs_buf_release(rsp);
236}
237
Steve French1982c342005-08-17 12:38:22 -0700238/* NB: MID can not be set if treeCon not passed in, in that
239 case it is responsbility of caller to set the mid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240void
241header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
Steve French96daf2b2011-05-27 04:34:02 +0000242 const struct cifs_tcon *treeCon, int word_count
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 /* length of fixed section (word count) in two byte units */)
244{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 char *temp = (char *) buffer;
246
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000247 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000249 buffer->smb_buf_length = cpu_to_be32(
Steve French630f3f0c2007-10-25 21:17:17 +0000250 (2 * word_count) + sizeof(struct smb_hdr) -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 4 /* RFC 1001 length field does not count */ +
Steve Frenchbe8e3b02011-04-29 05:40:20 +0000252 2 /* for bcc field itself */) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 buffer->Protocol[0] = 0xFF;
255 buffer->Protocol[1] = 'S';
256 buffer->Protocol[2] = 'M';
257 buffer->Protocol[3] = 'B';
258 buffer->Command = smb_command;
259 buffer->Flags = 0x00; /* case sensitive */
260 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
261 buffer->Pid = cpu_to_le16((__u16)current->tgid);
262 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 if (treeCon) {
264 buffer->Tid = treeCon->tid;
265 if (treeCon->ses) {
266 if (treeCon->ses->capabilities & CAP_UNICODE)
267 buffer->Flags2 |= SMBFLG2_UNICODE;
Steve Frenchad7a2922008-02-07 23:25:02 +0000268 if (treeCon->ses->capabilities & CAP_STATUS32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
Steve Frenchad7a2922008-02-07 23:25:02 +0000270
Steve French1982c342005-08-17 12:38:22 -0700271 /* Uid is not converted */
272 buffer->Uid = treeCon->ses->Suid;
Pavel Shilovsky88257362012-05-23 14:01:59 +0400273 buffer->Mid = get_next_mid(treeCon->ses->server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 }
275 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
276 buffer->Flags2 |= SMBFLG2_DFS;
Steve Frenchd3485d32005-08-19 11:04:29 -0700277 if (treeCon->nocase)
278 buffer->Flags |= SMBFLG_CASELESS;
Steve French790fe572007-07-07 19:25:05 +0000279 if ((treeCon->ses) && (treeCon->ses->server))
Jeff Layton38d77c52013-05-26 07:01:00 -0400280 if (treeCon->ses->server->sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
282 }
283
284/* endian conversion of flags is now done just before sending */
285 buffer->WordCount = (char) word_count;
286 return;
287}
288
Steve French2cd646a2006-09-28 19:43:08 +0000289static int
Tim Gardner944d6f12013-10-16 09:09:49 -0600290check_smb_hdr(struct smb_hdr *smb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
Jeff Layton68abaff2011-01-28 15:05:42 -0500292 /* does it have the right SMB "signature" ? */
293 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500294 cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
295 *(unsigned int *)smb->Protocol);
Jeff Layton68abaff2011-01-28 15:05:42 -0500296 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 }
Jeff Layton68abaff2011-01-28 15:05:42 -0500298
Jeff Layton68abaff2011-01-28 15:05:42 -0500299 /* if it's a response then accept */
300 if (smb->Flags & SMBFLG_RESPONSE)
301 return 0;
302
303 /* only one valid case where server sends us request */
304 if (smb->Command == SMB_COM_LOCKING_ANDX)
305 return 0;
306
Tim Gardner3d378d32013-11-02 12:50:34 -0500307 cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
308 get_mid(smb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 return 1;
310}
311
312int
Steve French373512e2015-12-18 13:05:30 -0600313checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400315 struct smb_hdr *smb = (struct smb_hdr *)buf;
Jeff Layton376b43f2011-10-11 06:41:32 -0400316 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
Steve French190fdeb2005-10-10 11:48:26 -0700317 __u32 clc_len; /* calculated length */
Joe Perchesf96637b2013-05-04 22:12:25 -0500318 cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
319 total_read, rfclen);
Steve Frenchd103e162006-10-12 17:49:24 +0000320
Jeff Layton376b43f2011-10-11 06:41:32 -0400321 /* is this frame too small to even get to a BCC? */
322 if (total_read < 2 + sizeof(struct smb_hdr)) {
323 if ((total_read >= sizeof(struct smb_hdr) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 && (smb->Status.CifsError != 0)) {
Jeff Layton376b43f2011-10-11 06:41:32 -0400325 /* it's an error return */
Steve Frenchd103e162006-10-12 17:49:24 +0000326 smb->WordCount = 0;
327 /* some error cases do not return wct and bcc */
328 return 0;
Jeff Layton376b43f2011-10-11 06:41:32 -0400329 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
Steve Frenchd103e162006-10-12 17:49:24 +0000330 (smb->WordCount == 0)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000331 char *tmp = (char *)smb;
Steve Frenchd103e162006-10-12 17:49:24 +0000332 /* Need to work around a bug in two servers here */
333 /* First, check if the part of bcc they sent was zero */
334 if (tmp[sizeof(struct smb_hdr)] == 0) {
335 /* some servers return only half of bcc
336 * on simple responses (wct, bcc both zero)
337 * in particular have seen this on
338 * ulogoffX and FindClose. This leaves
339 * one byte of bcc potentially unitialized
340 */
341 /* zero rest of bcc */
342 tmp[sizeof(struct smb_hdr)+1] = 0;
Steve French46c79a62006-03-02 00:07:08 +0000343 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500345 cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
Steve Frenchd103e162006-10-12 17:49:24 +0000346 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500347 cifs_dbg(VFS, "Length less than smb header size\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
Jeff Layton376b43f2011-10-11 06:41:32 -0400349 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
351
Jeff Layton376b43f2011-10-11 06:41:32 -0400352 /* otherwise, there is enough to get to the BCC */
Tim Gardner944d6f12013-10-16 09:09:49 -0600353 if (check_smb_hdr(smb))
Jeff Layton376b43f2011-10-11 06:41:32 -0400354 return -EIO;
Jeff Layton820a8032011-05-04 08:05:26 -0400355 clc_len = smbCalcSize(smb);
Steve French184ed212006-02-24 06:15:11 +0000356
Jeff Layton376b43f2011-10-11 06:41:32 -0400357 if (4 + rfclen != total_read) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500358 cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
359 rfclen);
Jeff Layton376b43f2011-10-11 06:41:32 -0400360 return -EIO;
Steve French184ed212006-02-24 06:15:11 +0000361 }
362
Jeff Layton376b43f2011-10-11 06:41:32 -0400363 if (4 + rfclen != clc_len) {
Tim Gardner3d378d32013-11-02 12:50:34 -0500364 __u16 mid = get_mid(smb);
Steve French184ed212006-02-24 06:15:11 +0000365 /* check if bcc wrapped around for large read responses */
Jeff Layton376b43f2011-10-11 06:41:32 -0400366 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
Steve French184ed212006-02-24 06:15:11 +0000367 /* check if lengths match mod 64K */
Jeff Layton376b43f2011-10-11 06:41:32 -0400368 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000369 return 0; /* bcc wrapped */
Steve French184ed212006-02-24 06:15:11 +0000370 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500371 cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
Tim Gardner3d378d32013-11-02 12:50:34 -0500372 clc_len, 4 + rfclen, mid);
Jeff Layton62846442011-01-31 09:14:17 -0500373
Jeff Layton376b43f2011-10-11 06:41:32 -0400374 if (4 + rfclen < clc_len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500375 cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
Tim Gardner3d378d32013-11-02 12:50:34 -0500376 rfclen, mid);
Jeff Layton376b43f2011-10-11 06:41:32 -0400377 return -EIO;
378 } else if (rfclen > clc_len + 512) {
Jeff Layton62846442011-01-31 09:14:17 -0500379 /*
380 * Some servers (Windows XP in particular) send more
381 * data than the lengths in the SMB packet would
382 * indicate on certain calls (byte range locks and
383 * trans2 find first calls in particular). While the
384 * client can handle such a frame by ignoring the
385 * trailing data, we choose limit the amount of extra
386 * data to 512 bytes.
387 */
Joe Perchesf96637b2013-05-04 22:12:25 -0500388 cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
Tim Gardner3d378d32013-11-02 12:50:34 -0500389 rfclen, mid);
Jeff Layton376b43f2011-10-11 06:41:32 -0400390 return -EIO;
Steve French46c79a62006-03-02 00:07:08 +0000391 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
Steve French20962432005-09-21 22:05:57 -0700393 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
Steve French4b18f2a2008-04-29 00:06:05 +0000395
396bool
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400397is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000398{
Pavel Shilovskyd4e48542012-03-23 14:28:02 -0400399 struct smb_hdr *buf = (struct smb_hdr *)buffer;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000400 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500401 struct list_head *tmp, *tmp1, *tmp2;
Steve French96daf2b2011-05-27 04:34:02 +0000402 struct cifs_ses *ses;
403 struct cifs_tcon *tcon;
Jeff Laytonf1987b42008-11-15 11:12:47 -0500404 struct cifsInodeInfo *pCifsInode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 struct cifsFileInfo *netfile;
406
Joe Perchesf96637b2013-05-04 22:12:25 -0500407 cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
Steve French790fe572007-07-07 19:25:05 +0000408 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000410 struct smb_com_transaction_change_notify_rsp *pSMBr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 (struct smb_com_transaction_change_notify_rsp *)buf;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000412 struct file_notify_information *pnotify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 __u32 data_offset = 0;
Jeff Layton820a8032011-05-04 08:05:26 -0400414 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 data_offset = le32_to_cpu(pSMBr->DataOffset);
416
Steve French39798772006-05-31 22:40:51 +0000417 pnotify = (struct file_notify_information *)
418 ((char *)&pSMBr->hdr.Protocol + data_offset);
Joe Perchesf96637b2013-05-04 22:12:25 -0500419 cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000420 pnotify->FileName, pnotify->Action);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000421 /* cifs_dump_mem("Rcvd notify Data: ",buf,
Steve French39798772006-05-31 22:40:51 +0000422 sizeof(struct smb_hdr)+60); */
Steve French4b18f2a2008-04-29 00:06:05 +0000423 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
Steve French790fe572007-07-07 19:25:05 +0000425 if (pSMBr->hdr.Status.CifsError) {
Steve French59b04c52014-08-02 21:16:48 -0500426 cifs_dbg(FYI, "notify err 0x%x\n",
Joe Perchesf96637b2013-05-04 22:12:25 -0500427 pSMBr->hdr.Status.CifsError);
Steve French4b18f2a2008-04-29 00:06:05 +0000428 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 }
Steve French4b18f2a2008-04-29 00:06:05 +0000430 return false;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000431 }
Steve French790fe572007-07-07 19:25:05 +0000432 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
Steve French4b18f2a2008-04-29 00:06:05 +0000433 return false;
Steve French790fe572007-07-07 19:25:05 +0000434 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 /* no sense logging error on invalid handle on oplock
436 break - harmless race between close request and oplock
437 break response is expected from time to time writing out
438 large dirty files cached on the client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000439 if ((NT_STATUS_INVALID_HANDLE) ==
440 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500441 cifs_dbg(FYI, "invalid handle on oplock break\n");
Steve French4b18f2a2008-04-29 00:06:05 +0000442 return true;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000443 } else if (ERRbadfid ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
Steve French4b18f2a2008-04-29 00:06:05 +0000445 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000447 return false; /* on valid oplock brk we get "request" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
449 }
Steve French790fe572007-07-07 19:25:05 +0000450 if (pSMB->hdr.WordCount != 8)
Steve French4b18f2a2008-04-29 00:06:05 +0000451 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Steve French59b04c52014-08-02 21:16:48 -0500453 cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000454 pSMB->LockType, pSMB->OplockLevel);
Steve French790fe572007-07-07 19:25:05 +0000455 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
Steve French4b18f2a2008-04-29 00:06:05 +0000456 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
458 /* look up tcon based on tid & uid */
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530459 spin_lock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500460 list_for_each(tmp, &srv->smb_ses_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000461 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500462 list_for_each(tmp1, &ses->tcon_list) {
Steve French96daf2b2011-05-27 04:34:02 +0000463 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500464 if (tcon->tid != buf->Tid)
465 continue;
466
Pavel Shilovsky44c58182012-05-28 14:16:31 +0400467 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
Jeff Layton44772882010-10-15 15:34:03 -0400468 spin_lock(&cifs_file_list_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500469 list_for_each(tmp2, &tcon->openFileList) {
470 netfile = list_entry(tmp2, struct cifsFileInfo,
Steve French57337e42005-04-28 22:41:10 -0700471 tlist);
Pavel Shilovsky4b4de762012-09-18 16:20:26 -0700472 if (pSMB->Fid != netfile->fid.netfid)
Jeff Laytonf1987b42008-11-15 11:12:47 -0500473 continue;
474
Joe Perchesf96637b2013-05-04 22:12:25 -0500475 cifs_dbg(FYI, "file id match, oplock break\n");
David Howells2b0143b2015-03-17 22:25:59 +0000476 pCifsInode = CIFS_I(d_inode(netfile->dentry));
Tejun Heo9b646972010-07-20 22:09:02 +0200477
Sachin Prabhuc11f1df2014-03-11 16:11:47 +0000478 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
479 &pCifsInode->flags);
480
481 /*
482 * Set flag if the server downgrades the oplock
483 * to L2 else clear.
484 */
485 if (pSMB->OplockLevel)
486 set_bit(
487 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
488 &pCifsInode->flags);
489 else
490 clear_bit(
491 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
492 &pCifsInode->flags);
493
Jeff Laytonda472fc2012-03-23 14:40:53 -0400494 queue_work(cifsiod_wq,
Jeff Laytonad635942011-07-26 12:20:17 -0400495 &netfile->oplock_break);
Tejun Heo9b646972010-07-20 22:09:02 +0200496 netfile->oplock_break_cancelled = false;
497
Jeff Layton44772882010-10-15 15:34:03 -0400498 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530499 spin_unlock(&cifs_tcp_ses_lock);
Jeff Laytonf1987b42008-11-15 11:12:47 -0500500 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
Jeff Layton44772882010-10-15 15:34:03 -0400502 spin_unlock(&cifs_file_list_lock);
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530503 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500504 cifs_dbg(FYI, "No matching file for oplock break\n");
Steve French4b18f2a2008-04-29 00:06:05 +0000505 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 }
507 }
Suresh Jayaraman3f9bcca2010-10-18 23:29:37 +0530508 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500509 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
Steve French4b18f2a2008-04-29 00:06:05 +0000510 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
513void
Pavel Shilovsky792af7b2012-03-23 14:28:02 -0400514dump_smb(void *buf, int smb_buf_length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (traceSMB == 0)
517 return;
518
Andy Shevchenko55d83e02014-08-27 16:49:43 +0300519 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
520 smb_buf_length, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521}
Steve French6a0b4822005-04-28 22:41:05 -0700522
Jeff Laytonec06aed2009-11-06 14:18:29 -0500523void
524cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
525{
526 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
Suresh Jayaramanf534dc92009-11-16 12:03:16 +0530527 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
Joe Perchesf96637b2013-05-04 22:12:25 -0500528 cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
529 cifs_sb_master_tcon(cifs_sb)->treeName);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500530 }
531}
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300532
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300533void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300534{
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300535 oplock &= 0xF;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300536
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300537 if (oplock == OPLOCK_EXCLUSIVE) {
Pavel Shilovsky18cceb62013-09-05 13:01:06 +0400538 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
Joe Perchesf96637b2013-05-04 22:12:25 -0500539 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
540 &cinode->vfs_inode);
Pavel Shilovskyc6723622010-11-03 10:58:57 +0300541 } else if (oplock == OPLOCK_READ) {
Pavel Shilovsky18cceb62013-09-05 13:01:06 +0400542 cinode->oplock = CIFS_CACHE_READ_FLG;
Joe Perchesf96637b2013-05-04 22:12:25 -0500543 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
544 &cinode->vfs_inode);
Pavel Shilovsky18cceb62013-09-05 13:01:06 +0400545 } else
546 cinode->oplock = 0;
Pavel Shilovskye66673e2010-11-02 12:00:42 +0300547}
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500548
Sachin Prabhuc11f1df2014-03-11 16:11:47 +0000549/*
550 * We wait for oplock breaks to be processed before we attempt to perform
551 * writes.
552 */
553int cifs_get_writer(struct cifsInodeInfo *cinode)
554{
555 int rc;
556
557start:
558 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
NeilBrown74316202014-07-07 15:16:04 +1000559 TASK_KILLABLE);
Sachin Prabhuc11f1df2014-03-11 16:11:47 +0000560 if (rc)
561 return rc;
562
563 spin_lock(&cinode->writers_lock);
564 if (!cinode->writers)
565 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
566 cinode->writers++;
567 /* Check to see if we have started servicing an oplock break */
568 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
569 cinode->writers--;
570 if (cinode->writers == 0) {
571 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
572 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
573 }
574 spin_unlock(&cinode->writers_lock);
575 goto start;
576 }
577 spin_unlock(&cinode->writers_lock);
578 return 0;
579}
580
581void cifs_put_writer(struct cifsInodeInfo *cinode)
582{
583 spin_lock(&cinode->writers_lock);
584 cinode->writers--;
585 if (cinode->writers == 0) {
586 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
587 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
588 }
589 spin_unlock(&cinode->writers_lock);
590}
591
592void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
593{
594 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
595 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
596}
597
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500598bool
599backup_cred(struct cifs_sb_info *cifs_sb)
600{
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
Eric W. Biederman1f682332013-02-06 01:20:20 -0800602 if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid()))
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500603 return true;
604 }
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
606 if (in_group_p(cifs_sb->mnt_backupgid))
607 return true;
608 }
609
610 return false;
611}
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700612
613void
614cifs_del_pending_open(struct cifs_pending_open *open)
615{
616 spin_lock(&cifs_file_list_lock);
617 list_del(&open->olist);
618 spin_unlock(&cifs_file_list_lock);
619}
620
621void
622cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
623 struct cifs_pending_open *open)
624{
625#ifdef CONFIG_CIFS_SMB2
626 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
627#endif
628 open->oplock = CIFS_OPLOCK_NO_CHANGE;
629 open->tlink = tlink;
630 fid->pending_open = open;
631 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
632}
633
634void
635cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
636 struct cifs_pending_open *open)
637{
638 spin_lock(&cifs_file_list_lock);
639 cifs_add_pending_open_locked(fid, tlink, open);
640 spin_unlock(&cifs_file_list_lock);
641}