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1/*
2 * fs/cifs/xattr.c
3 *
4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * 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
22#include <linux/fs.h>
23#include <linux/posix_acl_xattr.h>
24#include <linux/slab.h>
25#include <linux/xattr.h>
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
31#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
33
34#define MAX_EA_VALUE_SIZE 65535
35#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
36#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
37
38/* BB need to add server (Samba e.g) support for security and trusted prefix */
39
40int cifs_removexattr(struct dentry *direntry, const char *ea_name)
41{
42 int rc = -EOPNOTSUPP;
43#ifdef CONFIG_CIFS_XATTR
44 unsigned int xid;
45 struct cifs_sb_info *cifs_sb;
46 struct tcon_link *tlink;
47 struct cifs_tcon *pTcon;
48 struct super_block *sb;
49 char *full_path = NULL;
50
51 if (direntry == NULL)
52 return -EIO;
53 if (d_really_is_negative(direntry))
54 return -EIO;
55 sb = d_inode(direntry)->i_sb;
56 if (sb == NULL)
57 return -EIO;
58
59 cifs_sb = CIFS_SB(sb);
60 tlink = cifs_sb_tlink(cifs_sb);
61 if (IS_ERR(tlink))
62 return PTR_ERR(tlink);
63 pTcon = tlink_tcon(tlink);
64
65 xid = get_xid();
66
67 full_path = build_path_from_dentry(direntry);
68 if (full_path == NULL) {
69 rc = -ENOMEM;
70 goto remove_ea_exit;
71 }
72 if (ea_name == NULL) {
73 cifs_dbg(FYI, "Null xattr names not supported\n");
74 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
75 && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
76 cifs_dbg(FYI,
77 "illegal xattr request %s (only user namespace supported)\n",
78 ea_name);
79 /* BB what if no namespace prefix? */
80 /* Should we just pass them to server, except for
81 system and perhaps security prefixes? */
82 } else {
83 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
84 goto remove_ea_exit;
85
86 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
87 if (pTcon->ses->server->ops->set_EA)
88 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
89 full_path, ea_name, NULL, (__u16)0,
90 cifs_sb->local_nls, cifs_remap(cifs_sb));
91 }
92remove_ea_exit:
93 kfree(full_path);
94 free_xid(xid);
95 cifs_put_tlink(tlink);
96#endif
97 return rc;
98}
99
100int cifs_setxattr(struct dentry *direntry, const char *ea_name,
101 const void *ea_value, size_t value_size, int flags)
102{
103 int rc = -EOPNOTSUPP;
104#ifdef CONFIG_CIFS_XATTR
105 unsigned int xid;
106 struct cifs_sb_info *cifs_sb;
107 struct tcon_link *tlink;
108 struct cifs_tcon *pTcon;
109 struct super_block *sb;
110 char *full_path;
111
112 if (direntry == NULL)
113 return -EIO;
114 if (d_really_is_negative(direntry))
115 return -EIO;
116 sb = d_inode(direntry)->i_sb;
117 if (sb == NULL)
118 return -EIO;
119
120 cifs_sb = CIFS_SB(sb);
121 tlink = cifs_sb_tlink(cifs_sb);
122 if (IS_ERR(tlink))
123 return PTR_ERR(tlink);
124 pTcon = tlink_tcon(tlink);
125
126 xid = get_xid();
127
128 full_path = build_path_from_dentry(direntry);
129 if (full_path == NULL) {
130 rc = -ENOMEM;
131 goto set_ea_exit;
132 }
133 /* return dos attributes as pseudo xattr */
134 /* return alt name if available as pseudo attr */
135
136 /* if proc/fs/cifs/streamstoxattr is set then
137 search server for EAs or streams to
138 returns as xattrs */
139 if (value_size > MAX_EA_VALUE_SIZE) {
140 cifs_dbg(FYI, "size of EA value too large\n");
141 rc = -EOPNOTSUPP;
142 goto set_ea_exit;
143 }
144
145 if (ea_name == NULL) {
146 cifs_dbg(FYI, "Null xattr names not supported\n");
147 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
148 == 0) {
149 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
150 goto set_ea_exit;
151 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
152 cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
153
154 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
155 if (pTcon->ses->server->ops->set_EA)
156 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
157 full_path, ea_name, ea_value, (__u16)value_size,
158 cifs_sb->local_nls, cifs_remap(cifs_sb));
159 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
160 == 0) {
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
162 goto set_ea_exit;
163
164 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
165 if (pTcon->ses->server->ops->set_EA)
166 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
167 full_path, ea_name, ea_value, (__u16)value_size,
168 cifs_sb->local_nls, cifs_remap(cifs_sb));
169 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
170 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
171#ifdef CONFIG_CIFS_ACL
172 struct cifs_ntsd *pacl;
173 pacl = kmalloc(value_size, GFP_KERNEL);
174 if (!pacl) {
175 rc = -ENOMEM;
176 } else {
177 memcpy(pacl, ea_value, value_size);
178 if (pTcon->ses->server->ops->set_acl)
179 rc = pTcon->ses->server->ops->set_acl(pacl,
180 value_size, d_inode(direntry),
181 full_path, CIFS_ACL_DACL);
182 else
183 rc = -EOPNOTSUPP;
184 if (rc == 0) /* force revalidate of the inode */
185 CIFS_I(d_inode(direntry))->time = 0;
186 kfree(pacl);
187 }
188#else
189 cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
190#endif /* CONFIG_CIFS_ACL */
191 } else {
192 int temp;
193 temp = strncmp(ea_name, XATTR_NAME_POSIX_ACL_ACCESS,
194 strlen(XATTR_NAME_POSIX_ACL_ACCESS));
195 if (temp == 0) {
196#ifdef CONFIG_CIFS_POSIX
197 if (sb->s_flags & MS_POSIXACL)
198 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
199 ea_value, (const int)value_size,
200 ACL_TYPE_ACCESS, cifs_sb->local_nls,
201 cifs_remap(cifs_sb));
202 cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
203#else
204 cifs_dbg(FYI, "set POSIX ACL not supported\n");
205#endif
206 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_DEFAULT,
207 strlen(XATTR_NAME_POSIX_ACL_DEFAULT)) == 0) {
208#ifdef CONFIG_CIFS_POSIX
209 if (sb->s_flags & MS_POSIXACL)
210 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
211 ea_value, (const int)value_size,
212 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
213 cifs_remap(cifs_sb));
214 cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
215#else
216 cifs_dbg(FYI, "set default POSIX ACL not supported\n");
217#endif
218 } else {
219 cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
220 ea_name);
221 /* BB what if no namespace prefix? */
222 /* Should we just pass them to server, except for
223 system and perhaps security prefixes? */
224 }
225 }
226
227set_ea_exit:
228 kfree(full_path);
229 free_xid(xid);
230 cifs_put_tlink(tlink);
231#endif
232 return rc;
233}
234
235ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
236 void *ea_value, size_t buf_size)
237{
238 ssize_t rc = -EOPNOTSUPP;
239#ifdef CONFIG_CIFS_XATTR
240 unsigned int xid;
241 struct cifs_sb_info *cifs_sb;
242 struct tcon_link *tlink;
243 struct cifs_tcon *pTcon;
244 struct super_block *sb;
245 char *full_path;
246
247 if (direntry == NULL)
248 return -EIO;
249 if (d_really_is_negative(direntry))
250 return -EIO;
251 sb = d_inode(direntry)->i_sb;
252 if (sb == NULL)
253 return -EIO;
254
255 cifs_sb = CIFS_SB(sb);
256 tlink = cifs_sb_tlink(cifs_sb);
257 if (IS_ERR(tlink))
258 return PTR_ERR(tlink);
259 pTcon = tlink_tcon(tlink);
260
261 xid = get_xid();
262
263 full_path = build_path_from_dentry(direntry);
264 if (full_path == NULL) {
265 rc = -ENOMEM;
266 goto get_ea_exit;
267 }
268 /* return dos attributes as pseudo xattr */
269 /* return alt name if available as pseudo attr */
270 if (ea_name == NULL) {
271 cifs_dbg(FYI, "Null xattr names not supported\n");
272 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
273 == 0) {
274 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
275 goto get_ea_exit;
276
277 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
278 cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
279 /* revalidate/getattr then populate from inode */
280 } /* BB add else when above is implemented */
281 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
282 if (pTcon->ses->server->ops->query_all_EAs)
283 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
284 full_path, ea_name, ea_value, buf_size,
285 cifs_sb->local_nls, cifs_remap(cifs_sb));
286 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
287 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
288 goto get_ea_exit;
289
290 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
291 if (pTcon->ses->server->ops->query_all_EAs)
292 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
293 full_path, ea_name, ea_value, buf_size,
294 cifs_sb->local_nls, cifs_remap(cifs_sb));
295 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_ACCESS,
296 strlen(XATTR_NAME_POSIX_ACL_ACCESS)) == 0) {
297#ifdef CONFIG_CIFS_POSIX
298 if (sb->s_flags & MS_POSIXACL)
299 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
300 ea_value, buf_size, ACL_TYPE_ACCESS,
301 cifs_sb->local_nls,
302 cifs_remap(cifs_sb));
303#else
304 cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
305#endif /* CONFIG_CIFS_POSIX */
306 } else if (strncmp(ea_name, XATTR_NAME_POSIX_ACL_DEFAULT,
307 strlen(XATTR_NAME_POSIX_ACL_DEFAULT)) == 0) {
308#ifdef CONFIG_CIFS_POSIX
309 if (sb->s_flags & MS_POSIXACL)
310 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
311 ea_value, buf_size, ACL_TYPE_DEFAULT,
312 cifs_sb->local_nls,
313 cifs_remap(cifs_sb));
314#else
315 cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
316#endif /* CONFIG_CIFS_POSIX */
317 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
318 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
319#ifdef CONFIG_CIFS_ACL
320 u32 acllen;
321 struct cifs_ntsd *pacl;
322
323 if (pTcon->ses->server->ops->get_acl == NULL)
324 goto get_ea_exit; /* rc already EOPNOTSUPP */
325
326 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
327 d_inode(direntry), full_path, &acllen);
328 if (IS_ERR(pacl)) {
329 rc = PTR_ERR(pacl);
330 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
331 __func__, rc);
332 } else {
333 if (ea_value) {
334 if (acllen > buf_size)
335 acllen = -ERANGE;
336 else
337 memcpy(ea_value, pacl, acllen);
338 }
339 rc = acllen;
340 kfree(pacl);
341 }
342#else
343 cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
344#endif /* CONFIG_CIFS_ACL */
345 } else if (strncmp(ea_name,
346 XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
347 cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
348 } else if (strncmp(ea_name,
349 XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
350 cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
351 } else
352 cifs_dbg(FYI,
353 "illegal xattr request %s (only user namespace supported)\n",
354 ea_name);
355
356 /* We could add an additional check for streams ie
357 if proc/fs/cifs/streamstoxattr is set then
358 search server for EAs or streams to
359 returns as xattrs */
360
361 if (rc == -EINVAL)
362 rc = -EOPNOTSUPP;
363
364get_ea_exit:
365 kfree(full_path);
366 free_xid(xid);
367 cifs_put_tlink(tlink);
368#endif
369 return rc;
370}
371
372ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
373{
374 ssize_t rc = -EOPNOTSUPP;
375#ifdef CONFIG_CIFS_XATTR
376 unsigned int xid;
377 struct cifs_sb_info *cifs_sb;
378 struct tcon_link *tlink;
379 struct cifs_tcon *pTcon;
380 struct super_block *sb;
381 char *full_path;
382
383 if (direntry == NULL)
384 return -EIO;
385 if (d_really_is_negative(direntry))
386 return -EIO;
387 sb = d_inode(direntry)->i_sb;
388 if (sb == NULL)
389 return -EIO;
390
391 cifs_sb = CIFS_SB(sb);
392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
393 return -EOPNOTSUPP;
394
395 tlink = cifs_sb_tlink(cifs_sb);
396 if (IS_ERR(tlink))
397 return PTR_ERR(tlink);
398 pTcon = tlink_tcon(tlink);
399
400 xid = get_xid();
401
402 full_path = build_path_from_dentry(direntry);
403 if (full_path == NULL) {
404 rc = -ENOMEM;
405 goto list_ea_exit;
406 }
407 /* return dos attributes as pseudo xattr */
408 /* return alt name if available as pseudo attr */
409
410 /* if proc/fs/cifs/streamstoxattr is set then
411 search server for EAs or streams to
412 returns as xattrs */
413
414 if (pTcon->ses->server->ops->query_all_EAs)
415 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
416 full_path, NULL, data, buf_size,
417 cifs_sb->local_nls, cifs_remap(cifs_sb));
418list_ea_exit:
419 kfree(full_path);
420 free_xid(xid);
421 cifs_put_tlink(tlink);
422#endif
423 return rc;
424}
1/*
2 * fs/cifs/xattr.c
3 *
4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * 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
22#include <linux/fs.h>
23#include <linux/posix_acl_xattr.h>
24#include <linux/slab.h>
25#include <linux/xattr.h>
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
31#include "cifs_fs_sb.h"
32#include "cifs_unicode.h"
33
34#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
35#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
36#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
37#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
38/*
39 * Although these three are just aliases for the above, need to move away from
40 * confusing users and using the 20+ year old term 'cifs' when it is no longer
41 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
42 */
43#define SMB3_XATTR_CIFS_ACL "system.smb3_acl"
44#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
45#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
46/* BB need to add server (Samba e.g) support for security and trusted prefix */
47
48enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
49
50static int cifs_xattr_set(const struct xattr_handler *handler,
51 struct dentry *dentry, struct inode *inode,
52 const char *name, const void *value,
53 size_t size, int flags)
54{
55 int rc = -EOPNOTSUPP;
56 unsigned int xid;
57 struct super_block *sb = dentry->d_sb;
58 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
59 struct tcon_link *tlink;
60 struct cifs_tcon *pTcon;
61 char *full_path;
62
63 tlink = cifs_sb_tlink(cifs_sb);
64 if (IS_ERR(tlink))
65 return PTR_ERR(tlink);
66 pTcon = tlink_tcon(tlink);
67
68 xid = get_xid();
69
70 full_path = build_path_from_dentry(dentry);
71 if (full_path == NULL) {
72 rc = -ENOMEM;
73 goto out;
74 }
75 /* return dos attributes as pseudo xattr */
76 /* return alt name if available as pseudo attr */
77
78 /* if proc/fs/cifs/streamstoxattr is set then
79 search server for EAs or streams to
80 returns as xattrs */
81 if (size > MAX_EA_VALUE_SIZE) {
82 cifs_dbg(FYI, "size of EA value too large\n");
83 rc = -EOPNOTSUPP;
84 goto out;
85 }
86
87 switch (handler->flags) {
88 case XATTR_USER:
89 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
90 goto out;
91
92 if (pTcon->ses->server->ops->set_EA)
93 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
94 full_path, name, value, (__u16)size,
95 cifs_sb->local_nls, cifs_sb);
96 break;
97
98 case XATTR_CIFS_ACL: {
99 struct cifs_ntsd *pacl;
100
101 if (!value)
102 goto out;
103 pacl = kmalloc(size, GFP_KERNEL);
104 if (!pacl) {
105 rc = -ENOMEM;
106 } else {
107 memcpy(pacl, value, size);
108 if (value &&
109 pTcon->ses->server->ops->set_acl)
110 rc = pTcon->ses->server->ops->set_acl(pacl,
111 size, inode,
112 full_path, CIFS_ACL_DACL);
113 else
114 rc = -EOPNOTSUPP;
115 if (rc == 0) /* force revalidate of the inode */
116 CIFS_I(inode)->time = 0;
117 kfree(pacl);
118 }
119 break;
120 }
121
122 case XATTR_ACL_ACCESS:
123#ifdef CONFIG_CIFS_POSIX
124 if (!value)
125 goto out;
126 if (sb->s_flags & SB_POSIXACL)
127 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
128 value, (const int)size,
129 ACL_TYPE_ACCESS, cifs_sb->local_nls,
130 cifs_remap(cifs_sb));
131#endif /* CONFIG_CIFS_POSIX */
132 break;
133
134 case XATTR_ACL_DEFAULT:
135#ifdef CONFIG_CIFS_POSIX
136 if (!value)
137 goto out;
138 if (sb->s_flags & SB_POSIXACL)
139 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
140 value, (const int)size,
141 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
142 cifs_remap(cifs_sb));
143#endif /* CONFIG_CIFS_POSIX */
144 break;
145 }
146
147out:
148 kfree(full_path);
149 free_xid(xid);
150 cifs_put_tlink(tlink);
151 return rc;
152}
153
154static int cifs_attrib_get(struct dentry *dentry,
155 struct inode *inode, void *value,
156 size_t size)
157{
158 ssize_t rc;
159 __u32 *pattribute;
160
161 rc = cifs_revalidate_dentry_attr(dentry);
162
163 if (rc)
164 return rc;
165
166 if ((value == NULL) || (size == 0))
167 return sizeof(__u32);
168 else if (size < sizeof(__u32))
169 return -ERANGE;
170
171 /* return dos attributes as pseudo xattr */
172 pattribute = (__u32 *)value;
173 *pattribute = CIFS_I(inode)->cifsAttrs;
174
175 return sizeof(__u32);
176}
177
178static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
179 void *value, size_t size)
180{
181 ssize_t rc;
182 __u64 * pcreatetime;
183
184 rc = cifs_revalidate_dentry_attr(dentry);
185 if (rc)
186 return rc;
187
188 if ((value == NULL) || (size == 0))
189 return sizeof(__u64);
190 else if (size < sizeof(__u64))
191 return -ERANGE;
192
193 /* return dos attributes as pseudo xattr */
194 pcreatetime = (__u64 *)value;
195 *pcreatetime = CIFS_I(inode)->createtime;
196 return sizeof(__u64);
197}
198
199
200static int cifs_xattr_get(const struct xattr_handler *handler,
201 struct dentry *dentry, struct inode *inode,
202 const char *name, void *value, size_t size)
203{
204 ssize_t rc = -EOPNOTSUPP;
205 unsigned int xid;
206 struct super_block *sb = dentry->d_sb;
207 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
208 struct tcon_link *tlink;
209 struct cifs_tcon *pTcon;
210 char *full_path;
211
212 tlink = cifs_sb_tlink(cifs_sb);
213 if (IS_ERR(tlink))
214 return PTR_ERR(tlink);
215 pTcon = tlink_tcon(tlink);
216
217 xid = get_xid();
218
219 full_path = build_path_from_dentry(dentry);
220 if (full_path == NULL) {
221 rc = -ENOMEM;
222 goto out;
223 }
224
225 /* return alt name if available as pseudo attr */
226 switch (handler->flags) {
227 case XATTR_USER:
228 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
229 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
230 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
231 rc = cifs_attrib_get(dentry, inode, value, size);
232 break;
233 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
234 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
235 rc = cifs_creation_time_get(dentry, inode, value, size);
236 break;
237 }
238
239 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
240 goto out;
241
242 if (pTcon->ses->server->ops->query_all_EAs)
243 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
244 full_path, name, value, size, cifs_sb);
245 break;
246
247 case XATTR_CIFS_ACL: {
248 u32 acllen;
249 struct cifs_ntsd *pacl;
250
251 if (pTcon->ses->server->ops->get_acl == NULL)
252 goto out; /* rc already EOPNOTSUPP */
253
254 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
255 inode, full_path, &acllen);
256 if (IS_ERR(pacl)) {
257 rc = PTR_ERR(pacl);
258 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
259 __func__, rc);
260 } else {
261 if (value) {
262 if (acllen > size)
263 acllen = -ERANGE;
264 else
265 memcpy(value, pacl, acllen);
266 }
267 rc = acllen;
268 kfree(pacl);
269 }
270 break;
271 }
272
273 case XATTR_ACL_ACCESS:
274#ifdef CONFIG_CIFS_POSIX
275 if (sb->s_flags & SB_POSIXACL)
276 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
277 value, size, ACL_TYPE_ACCESS,
278 cifs_sb->local_nls,
279 cifs_remap(cifs_sb));
280#endif /* CONFIG_CIFS_POSIX */
281 break;
282
283 case XATTR_ACL_DEFAULT:
284#ifdef CONFIG_CIFS_POSIX
285 if (sb->s_flags & SB_POSIXACL)
286 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
287 value, size, ACL_TYPE_DEFAULT,
288 cifs_sb->local_nls,
289 cifs_remap(cifs_sb));
290#endif /* CONFIG_CIFS_POSIX */
291 break;
292 }
293
294 /* We could add an additional check for streams ie
295 if proc/fs/cifs/streamstoxattr is set then
296 search server for EAs or streams to
297 returns as xattrs */
298
299 if (rc == -EINVAL)
300 rc = -EOPNOTSUPP;
301
302out:
303 kfree(full_path);
304 free_xid(xid);
305 cifs_put_tlink(tlink);
306 return rc;
307}
308
309ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
310{
311 ssize_t rc = -EOPNOTSUPP;
312 unsigned int xid;
313 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
314 struct tcon_link *tlink;
315 struct cifs_tcon *pTcon;
316 char *full_path;
317
318 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
319 return -EOPNOTSUPP;
320
321 tlink = cifs_sb_tlink(cifs_sb);
322 if (IS_ERR(tlink))
323 return PTR_ERR(tlink);
324 pTcon = tlink_tcon(tlink);
325
326 xid = get_xid();
327
328 full_path = build_path_from_dentry(direntry);
329 if (full_path == NULL) {
330 rc = -ENOMEM;
331 goto list_ea_exit;
332 }
333 /* return dos attributes as pseudo xattr */
334 /* return alt name if available as pseudo attr */
335
336 /* if proc/fs/cifs/streamstoxattr is set then
337 search server for EAs or streams to
338 returns as xattrs */
339
340 if (pTcon->ses->server->ops->query_all_EAs)
341 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
342 full_path, NULL, data, buf_size, cifs_sb);
343list_ea_exit:
344 kfree(full_path);
345 free_xid(xid);
346 cifs_put_tlink(tlink);
347 return rc;
348}
349
350static const struct xattr_handler cifs_user_xattr_handler = {
351 .prefix = XATTR_USER_PREFIX,
352 .flags = XATTR_USER,
353 .get = cifs_xattr_get,
354 .set = cifs_xattr_set,
355};
356
357/* os2.* attributes are treated like user.* attributes */
358static const struct xattr_handler cifs_os2_xattr_handler = {
359 .prefix = XATTR_OS2_PREFIX,
360 .flags = XATTR_USER,
361 .get = cifs_xattr_get,
362 .set = cifs_xattr_set,
363};
364
365static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
366 .name = CIFS_XATTR_CIFS_ACL,
367 .flags = XATTR_CIFS_ACL,
368 .get = cifs_xattr_get,
369 .set = cifs_xattr_set,
370};
371
372/*
373 * Although this is just an alias for the above, need to move away from
374 * confusing users and using the 20 year old term 'cifs' when it is no
375 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
376 * SMB3 and later are highly secure.
377 */
378static const struct xattr_handler smb3_acl_xattr_handler = {
379 .name = SMB3_XATTR_CIFS_ACL,
380 .flags = XATTR_CIFS_ACL,
381 .get = cifs_xattr_get,
382 .set = cifs_xattr_set,
383};
384
385static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
386 .name = XATTR_NAME_POSIX_ACL_ACCESS,
387 .flags = XATTR_ACL_ACCESS,
388 .get = cifs_xattr_get,
389 .set = cifs_xattr_set,
390};
391
392static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
393 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
394 .flags = XATTR_ACL_DEFAULT,
395 .get = cifs_xattr_get,
396 .set = cifs_xattr_set,
397};
398
399const struct xattr_handler *cifs_xattr_handlers[] = {
400 &cifs_user_xattr_handler,
401 &cifs_os2_xattr_handler,
402 &cifs_cifs_acl_xattr_handler,
403 &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
404 &cifs_posix_acl_access_xattr_handler,
405 &cifs_posix_acl_default_xattr_handler,
406 NULL
407};