blob: e6c707cc62b39b445b4b374eeec51a5be4fe07f4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/link.c
3 *
Steve French366781c2008-01-25 10:12:41 +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
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/stat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/namei.h>
25#include "cifsfs.h"
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_debug.h"
30#include "cifs_fs_sb.h"
Steve French2baa2682014-09-27 02:19:01 -050031#include "cifs_unicode.h"
Steve Frenchc22870e2014-09-16 07:18:19 -050032#ifdef CONFIG_CIFS_SMB2
Steve French5ab97572014-09-15 04:49:28 -050033#include "smb2proto.h"
Steve Frenchc22870e2014-09-16 07:18:19 -050034#endif
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +020035
Sachin Prabhu0f8dce12013-11-25 17:09:53 +000036/*
37 * M-F Symlink Functions - Begin
38 */
39
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +020040#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
41#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
42#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
43#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
44#define CIFS_MF_SYMLINK_FILE_SIZE \
45 (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
46
47#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
48#define CIFS_MF_SYMLINK_MD5_FORMAT \
49 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
50#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
51 md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \
52 md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \
53 md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\
54 md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
55
56static int
Steve French93c100c2011-01-25 19:28:43 +000057symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
58{
59 int rc;
60 unsigned int size;
61 struct crypto_shash *md5;
62 struct sdesc *sdescmd5;
63
64 md5 = crypto_alloc_shash("md5", 0, 0);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -060065 if (IS_ERR(md5)) {
Jeff Laytonffeb4142011-01-29 07:03:02 -050066 rc = PTR_ERR(md5);
Joe Perchesf96637b2013-05-04 22:12:25 -050067 cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n",
68 __func__, rc);
Jeff Laytonffeb4142011-01-29 07:03:02 -050069 return rc;
Steve French93c100c2011-01-25 19:28:43 +000070 }
71 size = sizeof(struct shash_desc) + crypto_shash_descsize(md5);
72 sdescmd5 = kmalloc(size, GFP_KERNEL);
73 if (!sdescmd5) {
74 rc = -ENOMEM;
Steve French93c100c2011-01-25 19:28:43 +000075 goto symlink_hash_err;
76 }
77 sdescmd5->shash.tfm = md5;
78 sdescmd5->shash.flags = 0x0;
79
80 rc = crypto_shash_init(&sdescmd5->shash);
81 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -050082 cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
Steve French93c100c2011-01-25 19:28:43 +000083 goto symlink_hash_err;
84 }
Shirish Pargaonkar14cae322011-06-20 16:14:03 -050085 rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
86 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -050087 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -050088 goto symlink_hash_err;
89 }
Steve French93c100c2011-01-25 19:28:43 +000090 rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -050091 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -050092 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Steve French93c100c2011-01-25 19:28:43 +000093
94symlink_hash_err:
95 crypto_free_shash(md5);
96 kfree(sdescmd5);
97
98 return rc;
99}
100
101static int
Sachin Prabhucb084b12013-11-25 17:09:50 +0000102parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
103 char **_link_str)
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +0200104{
105 int rc;
106 unsigned int link_len;
107 const char *md5_str1;
108 const char *link_str;
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +0200109 u8 md5_hash[16];
110 char md5_str2[34];
111
112 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
113 return -EINVAL;
114
115 md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
116 link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
117
118 rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
119 if (rc != 1)
120 return -EINVAL;
121
Steve French93c100c2011-01-25 19:28:43 +0000122 rc = symlink_hash(link_len, link_str, md5_hash);
123 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500124 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
Steve French93c100c2011-01-25 19:28:43 +0000125 return rc;
126 }
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +0200127
128 snprintf(md5_str2, sizeof(md5_str2),
129 CIFS_MF_SYMLINK_MD5_FORMAT,
130 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
131
132 if (strncmp(md5_str1, md5_str2, 17) != 0)
133 return -EINVAL;
134
135 if (_link_str) {
136 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
137 if (!*_link_str)
138 return -ENOMEM;
139 }
140
141 *_link_len = link_len;
142 return 0;
143}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200145static int
Sachin Prabhucb084b12013-11-25 17:09:50 +0000146format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
Stefan Metzmacher18bddd12010-08-03 11:24:22 +0200147{
Steve French93c100c2011-01-25 19:28:43 +0000148 int rc;
Stefan Metzmacher18bddd12010-08-03 11:24:22 +0200149 unsigned int link_len;
150 unsigned int ofs;
Stefan Metzmacher18bddd12010-08-03 11:24:22 +0200151 u8 md5_hash[16];
152
153 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
154 return -EINVAL;
155
156 link_len = strlen(link_str);
157
158 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
159 return -ENAMETOOLONG;
160
Steve French93c100c2011-01-25 19:28:43 +0000161 rc = symlink_hash(link_len, link_str, md5_hash);
162 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500163 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
Steve French93c100c2011-01-25 19:28:43 +0000164 return rc;
165 }
Stefan Metzmacher18bddd12010-08-03 11:24:22 +0200166
167 snprintf(buf, buf_len,
168 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
169 link_len,
170 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
171
172 ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
173 memcpy(buf + ofs, link_str, link_len);
174
175 ofs += link_len;
176 if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
177 buf[ofs] = '\n';
178 ofs++;
179 }
180
181 while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
182 buf[ofs] = ' ';
183 ofs++;
184 }
185
186 return 0;
187}
188
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000189bool
190couldbe_mf_symlink(const struct cifs_fattr *fattr)
191{
Sachin Prabhua9a315d2014-01-31 14:27:16 +0000192 if (!S_ISREG(fattr->cf_mode))
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000193 /* it's not a symlink */
194 return false;
195
196 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
197 /* it's not a symlink */
198 return false;
199
200 return true;
201}
202
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200203static int
Sachin Prabhucb084b12013-11-25 17:09:50 +0000204create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000205 struct cifs_sb_info *cifs_sb, const char *fromName,
206 const char *toName)
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200207{
208 int rc;
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200209 u8 *buf;
210 unsigned int bytes_written = 0;
211
212 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
213 if (!buf)
214 return -ENOMEM;
215
Sachin Prabhucb084b12013-11-25 17:09:50 +0000216 rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000217 if (rc)
218 goto out;
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200219
Steve Frenchda806592014-09-14 23:27:09 -0500220 if (tcon->ses->server->ops->create_mf_symlink)
221 rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
222 cifs_sb, fromName, buf, &bytes_written);
223 else
224 rc = -EOPNOTSUPP;
225
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000226 if (rc)
227 goto out;
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200228
229 if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000230 rc = -EIO;
231out:
232 kfree(buf);
233 return rc;
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200234}
235
236static int
Sachin Prabhucb084b12013-11-25 17:09:50 +0000237query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000238 struct cifs_sb_info *cifs_sb, const unsigned char *path,
239 char **symlinkinfo)
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200240{
241 int rc;
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000242 u8 *buf = NULL;
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200243 unsigned int link_len = 0;
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000244 unsigned int bytes_read = 0;
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200245
246 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
247 if (!buf)
248 return -ENOMEM;
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200249
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000250 if (tcon->ses->server->ops->query_mf_symlink)
251 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
252 cifs_sb, path, buf, &bytes_read);
253 else
254 rc = -ENOSYS;
255
256 if (rc)
257 goto out;
258
259 if (bytes_read == 0) { /* not a symlink */
260 rc = -EINVAL;
261 goto out;
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200262 }
263
Sachin Prabhucb084b12013-11-25 17:09:50 +0000264 rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000265out:
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200266 kfree(buf);
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000267 return rc;
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200268}
269
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000270int
271check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
272 struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
273 const unsigned char *path)
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200274{
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000275 int rc;
276 u8 *buf = NULL;
277 unsigned int link_len = 0;
278 unsigned int bytes_read = 0;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200279
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000280 if (!couldbe_mf_symlink(fattr))
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200281 /* it's not a symlink */
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000282 return 0;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200283
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000284 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
285 if (!buf)
286 return -ENOMEM;
287
288 if (tcon->ses->server->ops->query_mf_symlink)
289 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
290 cifs_sb, path, buf, &bytes_read);
291 else
292 rc = -ENOSYS;
293
294 if (rc)
295 goto out;
296
297 if (bytes_read == 0) /* not a symlink */
298 goto out;
299
300 rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
301 if (rc == -EINVAL) {
302 /* it's not a symlink */
303 rc = 0;
304 goto out;
305 }
306
307 if (rc != 0)
308 goto out;
309
310 /* it is a symlink */
311 fattr->cf_eof = link_len;
312 fattr->cf_mode &= ~S_IFMT;
313 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
314 fattr->cf_dtype = DT_LNK;
315out:
316 kfree(buf);
317 return rc;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200318}
319
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000320/*
321 * SMB 1.0 Protocol specific functions
322 */
323
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200324int
Sachin Prabhub5be1a12013-11-25 17:09:49 +0000325cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
326 struct cifs_sb_info *cifs_sb, const unsigned char *path,
327 char *pbuf, unsigned int *pbytes_read)
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200328{
329 int rc;
330 int oplock = 0;
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400331 struct cifs_fid fid;
332 struct cifs_open_parms oparms;
Pavel Shilovskyd4ffff12011-05-26 06:02:00 +0000333 struct cifs_io_parms io_parms;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200334 int buf_type = CIFS_NO_BUFFER;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200335 FILE_ALL_INFO file_info;
336
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400337 oparms.tcon = tcon;
338 oparms.cifs_sb = cifs_sb;
339 oparms.desired_access = GENERIC_READ;
340 oparms.create_options = CREATE_NOT_DIR;
341 oparms.disposition = FILE_OPEN;
342 oparms.path = path;
343 oparms.fid = &fid;
344 oparms.reconnect = false;
345
346 rc = CIFS_open(xid, &oparms, &oplock, &file_info);
Sachin Prabhub5be1a12013-11-25 17:09:49 +0000347 if (rc)
Steve French1b244082013-07-11 19:17:40 -0500348 return rc;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200349
Steve French364d4292014-09-16 06:40:25 -0500350 if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
351 rc = -ENOENT;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200352 /* it's not a symlink */
Sachin Prabhub5be1a12013-11-25 17:09:49 +0000353 goto out;
Steve French364d4292014-09-16 06:40:25 -0500354 }
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200355
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400356 io_parms.netfid = fid.netfid;
Steve French1b244082013-07-11 19:17:40 -0500357 io_parms.pid = current->tgid;
Sachin Prabhub5be1a12013-11-25 17:09:49 +0000358 io_parms.tcon = tcon;
Steve French1b244082013-07-11 19:17:40 -0500359 io_parms.offset = 0;
360 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
361
362 rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
Sachin Prabhub5be1a12013-11-25 17:09:49 +0000363out:
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400364 CIFSSMBClose(xid, tcon, fid.netfid);
Steve French1b244082013-07-11 19:17:40 -0500365 return rc;
366}
367
Steve French1b244082013-07-11 19:17:40 -0500368int
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000369cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
370 struct cifs_sb_info *cifs_sb, const unsigned char *path,
371 char *pbuf, unsigned int *pbytes_written)
372{
373 int rc;
374 int oplock = 0;
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400375 struct cifs_fid fid;
376 struct cifs_open_parms oparms;
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000377 struct cifs_io_parms io_parms;
378 int create_options = CREATE_NOT_DIR;
379
380 if (backup_cred(cifs_sb))
381 create_options |= CREATE_OPEN_BACKUP_INTENT;
382
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400383 oparms.tcon = tcon;
384 oparms.cifs_sb = cifs_sb;
385 oparms.desired_access = GENERIC_WRITE;
386 oparms.create_options = create_options;
Björn Baumbacha1d0b84c2014-06-10 12:03:26 +0200387 oparms.disposition = FILE_CREATE;
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400388 oparms.path = path;
389 oparms.fid = &fid;
390 oparms.reconnect = false;
391
392 rc = CIFS_open(xid, &oparms, &oplock, NULL);
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000393 if (rc)
394 return rc;
395
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400396 io_parms.netfid = fid.netfid;
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000397 io_parms.pid = current->tgid;
398 io_parms.tcon = tcon;
399 io_parms.offset = 0;
400 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
401
402 rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf, NULL, 0);
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400403 CIFSSMBClose(xid, tcon, fid.netfid);
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000404 return rc;
405}
406
Steve Frenchc22870e2014-09-16 07:18:19 -0500407/*
408 * SMB 2.1/SMB3 Protocol specific functions
409 */
410#ifdef CONFIG_CIFS_SMB2
411int
412smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
413 struct cifs_sb_info *cifs_sb, const unsigned char *path,
414 char *pbuf, unsigned int *pbytes_read)
415{
416 int rc;
417 struct cifs_fid fid;
418 struct cifs_open_parms oparms;
419 struct cifs_io_parms io_parms;
420 int buf_type = CIFS_NO_BUFFER;
421 __le16 *utf16_path;
422 __u8 oplock = SMB2_OPLOCK_LEVEL_II;
423 struct smb2_file_all_info *pfile_info = NULL;
424
425 oparms.tcon = tcon;
426 oparms.cifs_sb = cifs_sb;
427 oparms.desired_access = GENERIC_READ;
428 oparms.create_options = CREATE_NOT_DIR;
429 if (backup_cred(cifs_sb))
430 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
431 oparms.disposition = FILE_OPEN;
432 oparms.fid = &fid;
433 oparms.reconnect = false;
434
435 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
436 if (utf16_path == NULL)
437 return -ENOMEM;
438
439 pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
440 GFP_KERNEL);
441
442 if (pfile_info == NULL) {
443 kfree(utf16_path);
444 return -ENOMEM;
445 }
446
447 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL);
448 if (rc)
449 goto qmf_out_open_fail;
450
451 if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
452 /* it's not a symlink */
453 rc = -ENOENT; /* Is there a better rc to return? */
454 goto qmf_out;
455 }
456
457 io_parms.netfid = fid.netfid;
458 io_parms.pid = current->tgid;
459 io_parms.tcon = tcon;
460 io_parms.offset = 0;
461 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
462 io_parms.persistent_fid = fid.persistent_fid;
463 io_parms.volatile_fid = fid.volatile_fid;
464 rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
465qmf_out:
466 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
467qmf_out_open_fail:
468 kfree(utf16_path);
469 kfree(pfile_info);
470 return rc;
471}
472
Steve French5ab97572014-09-15 04:49:28 -0500473int
474smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
475 struct cifs_sb_info *cifs_sb, const unsigned char *path,
476 char *pbuf, unsigned int *pbytes_written)
477{
478 int rc;
479 struct cifs_fid fid;
480 struct cifs_open_parms oparms;
481 struct cifs_io_parms io_parms;
482 int create_options = CREATE_NOT_DIR;
483 __le16 *utf16_path;
484 __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
485 struct kvec iov[2];
486
487 if (backup_cred(cifs_sb))
488 create_options |= CREATE_OPEN_BACKUP_INTENT;
489
490 cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
491
492 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
493 if (!utf16_path)
494 return -ENOMEM;
495
496 oparms.tcon = tcon;
497 oparms.cifs_sb = cifs_sb;
498 oparms.desired_access = GENERIC_WRITE;
499 oparms.create_options = create_options;
500 oparms.disposition = FILE_CREATE;
501 oparms.fid = &fid;
502 oparms.reconnect = false;
503
504 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
505 if (rc) {
506 kfree(utf16_path);
507 return rc;
508 }
509
510 io_parms.netfid = fid.netfid;
511 io_parms.pid = current->tgid;
512 io_parms.tcon = tcon;
513 io_parms.offset = 0;
514 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
515 io_parms.persistent_fid = fid.persistent_fid;
516 io_parms.volatile_fid = fid.volatile_fid;
517
518 /* iov[0] is reserved for smb header */
519 iov[1].iov_base = pbuf;
520 iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
521
522 rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
523
524 /* Make sure we wrote all of the symlink data */
525 if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
526 rc = -EIO;
527
528 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
529
530 kfree(utf16_path);
531 return rc;
532}
Steve Frenchc22870e2014-09-16 07:18:19 -0500533#endif /* CONFIG_CIFS_SMB2 */
Steve French5ab97572014-09-15 04:49:28 -0500534
Sachin Prabhu0f8dce12013-11-25 17:09:53 +0000535/*
536 * M-F Symlink Functions - End
537 */
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539int
540cifs_hardlink(struct dentry *old_file, struct inode *inode,
541 struct dentry *direntry)
542{
543 int rc = -EACCES;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400544 unsigned int xid;
Steve Frenchd6e906f2012-09-18 16:20:31 -0700545 char *from_name = NULL;
546 char *to_name = NULL;
Jeff Layton7ffec372010-09-29 19:51:11 -0400547 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
548 struct tcon_link *tlink;
Steve Frenchd6e906f2012-09-18 16:20:31 -0700549 struct cifs_tcon *tcon;
550 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 struct cifsInodeInfo *cifsInode;
552
Jeff Layton7ffec372010-09-29 19:51:11 -0400553 tlink = cifs_sb_tlink(cifs_sb);
554 if (IS_ERR(tlink))
555 return PTR_ERR(tlink);
Steve Frenchd6e906f2012-09-18 16:20:31 -0700556 tcon = tlink_tcon(tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400557
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400558 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Steve Frenchd6e906f2012-09-18 16:20:31 -0700560 from_name = build_path_from_dentry(old_file);
561 to_name = build_path_from_dentry(direntry);
562 if ((from_name == NULL) || (to_name == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 rc = -ENOMEM;
564 goto cifs_hl_exit;
565 }
566
Steve Frenchd6e906f2012-09-18 16:20:31 -0700567 if (tcon->unix_ext)
568 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
Jeff Layton7ffec372010-09-29 19:51:11 -0400569 cifs_sb->local_nls,
Steve French2baa2682014-09-27 02:19:01 -0500570 cifs_remap(cifs_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 else {
Steve Frenchd6e906f2012-09-18 16:20:31 -0700572 server = tcon->ses->server;
Christian Engelmayerabf97672014-01-11 01:57:22 +0100573 if (!server->ops->create_hardlink) {
574 rc = -ENOSYS;
575 goto cifs_hl_exit;
576 }
Steve Frenchd6e906f2012-09-18 16:20:31 -0700577 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
578 cifs_sb);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000579 if ((rc == -EIO) || (rc == -EINVAL))
580 rc = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 }
582
Steve French31ec35d2006-11-16 20:54:20 +0000583 d_drop(direntry); /* force new lookup from server of target */
584
Steve Frenchd6e906f2012-09-18 16:20:31 -0700585 /*
586 * if source file is cached (oplocked) revalidate will not go to server
587 * until the file is closed or oplock broken so update nlinks locally
588 */
David Howells2b0143b2015-03-17 22:25:59 +0000589 if (d_really_is_positive(old_file)) {
590 cifsInode = CIFS_I(d_inode(old_file));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000591 if (rc == 0) {
David Howells2b0143b2015-03-17 22:25:59 +0000592 spin_lock(&d_inode(old_file)->i_lock);
593 inc_nlink(d_inode(old_file));
594 spin_unlock(&d_inode(old_file)->i_lock);
Steve Frenchff273cb2014-10-17 17:17:12 -0500595
Steve Frenchd6e906f2012-09-18 16:20:31 -0700596 /*
597 * parent dir timestamps will update from srv within a
598 * second, would it really be worth it to set the parent
599 * dir cifs inode time to zero to force revalidate
600 * (faster) for it too?
601 */
Steve French31ec35d2006-11-16 20:54:20 +0000602 }
Steve Frenchd6e906f2012-09-18 16:20:31 -0700603 /*
604 * if not oplocked will force revalidate to get info on source
Steve Frenchff273cb2014-10-17 17:17:12 -0500605 * file from srv. Note Samba server prior to 4.2 has bug -
606 * not updating src file ctime on hardlinks but Windows servers
607 * handle it properly
Steve Frenchd6e906f2012-09-18 16:20:31 -0700608 */
Steve French31ec35d2006-11-16 20:54:20 +0000609 cifsInode->time = 0;
610
Steve Frenchd6e906f2012-09-18 16:20:31 -0700611 /*
612 * Will update parent dir timestamps from srv within a second.
613 * Would it really be worth it to set the parent dir (cifs
614 * inode) time field to zero to force revalidate on parent
615 * directory faster ie
616 *
617 * CIFS_I(inode)->time = 0;
618 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621cifs_hl_exit:
Steve Frenchd6e906f2012-09-18 16:20:31 -0700622 kfree(from_name);
623 kfree(to_name);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400624 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400625 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return rc;
627}
628
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700629void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
631{
David Howells2b0143b2015-03-17 22:25:59 +0000632 struct inode *inode = d_inode(direntry);
Jeff Layton8b6427a2009-05-19 09:57:03 -0400633 int rc = -ENOMEM;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400634 unsigned int xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 char *full_path = NULL;
Jeff Layton8b6427a2009-05-19 09:57:03 -0400636 char *target_path = NULL;
637 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400638 struct tcon_link *tlink = NULL;
Steve French96daf2b2011-05-27 04:34:02 +0000639 struct cifs_tcon *tcon;
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400640 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400642 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Jeff Layton7ffec372010-09-29 19:51:11 -0400644 tlink = cifs_sb_tlink(cifs_sb);
645 if (IS_ERR(tlink)) {
646 rc = PTR_ERR(tlink);
647 tlink = NULL;
648 goto out;
649 }
650 tcon = tlink_tcon(tlink);
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400651 server = tcon->ses->server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Jeff Layton8b6427a2009-05-19 09:57:03 -0400653 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (!full_path)
Jeff Layton460b9692009-04-30 07:17:56 -0400655 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Joe Perchesf96637b2013-05-04 22:12:25 -0500657 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200659 rc = -EACCES;
660 /*
661 * First try Minshall+French Symlinks, if configured
662 * and fallback to UNIX Extensions Symlinks.
663 */
664 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
Sachin Prabhu8205d1b2013-11-25 17:09:51 +0000665 rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
666 &target_path);
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200667
Sachin Prabhu0ecdb4f2013-11-27 13:27:12 +0000668 if (rc != 0 && server->ops->query_symlink)
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400669 rc = server->ops->query_symlink(xid, tcon, full_path,
670 &target_path, cifs_sb);
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200671
Jeff Layton8b6427a2009-05-19 09:57:03 -0400672 kfree(full_path);
673out:
Jeff Layton460b9692009-04-30 07:17:56 -0400674 if (rc != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 kfree(target_path);
676 target_path = ERR_PTR(rc);
677 }
678
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400679 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400680 if (tlink)
681 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 nd_set_link(nd, target_path);
Jeff Layton460b9692009-04-30 07:17:56 -0400683 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684}
685
686int
687cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
688{
689 int rc = -EOPNOTSUPP;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400690 unsigned int xid;
Jeff Layton7ffec372010-09-29 19:51:11 -0400691 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
692 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +0000693 struct cifs_tcon *pTcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 char *full_path = NULL;
695 struct inode *newinode = NULL;
696
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400697 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Jeff Layton7ffec372010-09-29 19:51:11 -0400699 tlink = cifs_sb_tlink(cifs_sb);
700 if (IS_ERR(tlink)) {
701 rc = PTR_ERR(tlink);
702 goto symlink_exit;
703 }
704 pTcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Steve French7f573562005-08-30 11:32:14 -0700706 full_path = build_path_from_dentry(direntry);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000707 if (full_path == NULL) {
Suresh Jayaraman0f3bc092009-06-25 18:12:34 +0530708 rc = -ENOMEM;
Jeff Layton7ffec372010-09-29 19:51:11 -0400709 goto symlink_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 }
711
Joe Perchesf96637b2013-05-04 22:12:25 -0500712 cifs_dbg(FYI, "Full path: %s\n", full_path);
713 cifs_dbg(FYI, "symname is %s\n", symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 /* BB what if DFS and this volume is on different share? BB */
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200716 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
Sachin Prabhucbb0aba2013-11-25 17:09:52 +0000717 rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200718 else if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
Nakajima Akirabc8ebdc42015-02-13 15:35:58 +0900720 cifs_sb->local_nls,
721 cifs_remap(cifs_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 /* else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000723 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
724 cifs_sb_target->local_nls); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 if (rc == 0) {
Steve Frenchc18c8422007-07-18 23:21:09 +0000727 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 rc = cifs_get_inode_info_unix(&newinode, full_path,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000729 inode->i_sb, xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 else
731 rc = cifs_get_inode_info(&newinode, full_path, NULL,
Steve French8b1327f2008-03-14 22:37:16 +0000732 inode->i_sb, xid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734 if (rc != 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500735 cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
736 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 d_instantiate(direntry, newinode);
739 }
740 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400741symlink_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800742 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400743 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400744 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 return rc;
746}