Loading...
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_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/* BB need to add server (Samba e.g) support for security and trusted prefix */
39
40enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
41
42static int cifs_xattr_set(const struct xattr_handler *handler,
43 struct dentry *dentry, struct inode *inode,
44 const char *name, const void *value,
45 size_t size, int flags)
46{
47 int rc = -EOPNOTSUPP;
48 unsigned int xid;
49 struct super_block *sb = dentry->d_sb;
50 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
51 struct tcon_link *tlink;
52 struct cifs_tcon *pTcon;
53 char *full_path;
54
55 tlink = cifs_sb_tlink(cifs_sb);
56 if (IS_ERR(tlink))
57 return PTR_ERR(tlink);
58 pTcon = tlink_tcon(tlink);
59
60 xid = get_xid();
61
62 full_path = build_path_from_dentry(dentry);
63 if (full_path == NULL) {
64 rc = -ENOMEM;
65 goto out;
66 }
67 /* return dos attributes as pseudo xattr */
68 /* return alt name if available as pseudo attr */
69
70 /* if proc/fs/cifs/streamstoxattr is set then
71 search server for EAs or streams to
72 returns as xattrs */
73 if (size > MAX_EA_VALUE_SIZE) {
74 cifs_dbg(FYI, "size of EA value too large\n");
75 rc = -EOPNOTSUPP;
76 goto out;
77 }
78
79 switch (handler->flags) {
80 case XATTR_USER:
81 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
82 goto out;
83
84 if (pTcon->ses->server->ops->set_EA)
85 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
86 full_path, name, value, (__u16)size,
87 cifs_sb->local_nls, cifs_remap(cifs_sb));
88 break;
89
90 case XATTR_CIFS_ACL: {
91#ifdef CONFIG_CIFS_ACL
92 struct cifs_ntsd *pacl;
93
94 if (!value)
95 goto out;
96 pacl = kmalloc(size, GFP_KERNEL);
97 if (!pacl) {
98 rc = -ENOMEM;
99 } else {
100 memcpy(pacl, value, size);
101 if (value &&
102 pTcon->ses->server->ops->set_acl)
103 rc = pTcon->ses->server->ops->set_acl(pacl,
104 size, inode,
105 full_path, CIFS_ACL_DACL);
106 else
107 rc = -EOPNOTSUPP;
108 if (rc == 0) /* force revalidate of the inode */
109 CIFS_I(inode)->time = 0;
110 kfree(pacl);
111 }
112#endif /* CONFIG_CIFS_ACL */
113 break;
114 }
115
116 case XATTR_ACL_ACCESS:
117#ifdef CONFIG_CIFS_POSIX
118 if (!value)
119 goto out;
120 if (sb->s_flags & MS_POSIXACL)
121 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
122 value, (const int)size,
123 ACL_TYPE_ACCESS, cifs_sb->local_nls,
124 cifs_remap(cifs_sb));
125#endif /* CONFIG_CIFS_POSIX */
126 break;
127
128 case XATTR_ACL_DEFAULT:
129#ifdef CONFIG_CIFS_POSIX
130 if (!value)
131 goto out;
132 if (sb->s_flags & MS_POSIXACL)
133 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
134 value, (const int)size,
135 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
136 cifs_remap(cifs_sb));
137#endif /* CONFIG_CIFS_POSIX */
138 break;
139 }
140
141out:
142 kfree(full_path);
143 free_xid(xid);
144 cifs_put_tlink(tlink);
145 return rc;
146}
147
148static int cifs_attrib_get(struct dentry *dentry,
149 struct inode *inode, void *value,
150 size_t size)
151{
152 ssize_t rc;
153 __u32 *pattribute;
154
155 rc = cifs_revalidate_dentry_attr(dentry);
156
157 if (rc)
158 return rc;
159
160 if ((value == NULL) || (size == 0))
161 return sizeof(__u32);
162 else if (size < sizeof(__u32))
163 return -ERANGE;
164
165 /* return dos attributes as pseudo xattr */
166 pattribute = (__u32 *)value;
167 *pattribute = CIFS_I(inode)->cifsAttrs;
168
169 return sizeof(__u32);
170}
171
172static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
173 void *value, size_t size)
174{
175 ssize_t rc;
176 __u64 * pcreatetime;
177
178 rc = cifs_revalidate_dentry_attr(dentry);
179 if (rc)
180 return rc;
181
182 if ((value == NULL) || (size == 0))
183 return sizeof(__u64);
184 else if (size < sizeof(__u64))
185 return -ERANGE;
186
187 /* return dos attributes as pseudo xattr */
188 pcreatetime = (__u64 *)value;
189 *pcreatetime = CIFS_I(inode)->createtime;
190 return sizeof(__u64);
191
192 return rc;
193}
194
195
196static int cifs_xattr_get(const struct xattr_handler *handler,
197 struct dentry *dentry, struct inode *inode,
198 const char *name, void *value, size_t size)
199{
200 ssize_t rc = -EOPNOTSUPP;
201 unsigned int xid;
202 struct super_block *sb = dentry->d_sb;
203 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
204 struct tcon_link *tlink;
205 struct cifs_tcon *pTcon;
206 char *full_path;
207
208 tlink = cifs_sb_tlink(cifs_sb);
209 if (IS_ERR(tlink))
210 return PTR_ERR(tlink);
211 pTcon = tlink_tcon(tlink);
212
213 xid = get_xid();
214
215 full_path = build_path_from_dentry(dentry);
216 if (full_path == NULL) {
217 rc = -ENOMEM;
218 goto out;
219 }
220
221 /* return alt name if available as pseudo attr */
222 switch (handler->flags) {
223 case XATTR_USER:
224 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
225 if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
226 rc = cifs_attrib_get(dentry, inode, value, size);
227 break;
228 } else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
229 rc = cifs_creation_time_get(dentry, inode, value, size);
230 break;
231 }
232
233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
234 goto out;
235
236 if (pTcon->ses->server->ops->query_all_EAs)
237 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
238 full_path, name, value, size,
239 cifs_sb->local_nls, cifs_remap(cifs_sb));
240 break;
241
242 case XATTR_CIFS_ACL: {
243#ifdef CONFIG_CIFS_ACL
244 u32 acllen;
245 struct cifs_ntsd *pacl;
246
247 if (pTcon->ses->server->ops->get_acl == NULL)
248 goto out; /* rc already EOPNOTSUPP */
249
250 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
251 inode, full_path, &acllen);
252 if (IS_ERR(pacl)) {
253 rc = PTR_ERR(pacl);
254 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
255 __func__, rc);
256 } else {
257 if (value) {
258 if (acllen > size)
259 acllen = -ERANGE;
260 else
261 memcpy(value, pacl, acllen);
262 }
263 rc = acllen;
264 kfree(pacl);
265 }
266#endif /* CONFIG_CIFS_ACL */
267 break;
268 }
269
270 case XATTR_ACL_ACCESS:
271#ifdef CONFIG_CIFS_POSIX
272 if (sb->s_flags & MS_POSIXACL)
273 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
274 value, size, ACL_TYPE_ACCESS,
275 cifs_sb->local_nls,
276 cifs_remap(cifs_sb));
277#endif /* CONFIG_CIFS_POSIX */
278 break;
279
280 case XATTR_ACL_DEFAULT:
281#ifdef CONFIG_CIFS_POSIX
282 if (sb->s_flags & MS_POSIXACL)
283 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
284 value, size, ACL_TYPE_DEFAULT,
285 cifs_sb->local_nls,
286 cifs_remap(cifs_sb));
287#endif /* CONFIG_CIFS_POSIX */
288 break;
289 }
290
291 /* We could add an additional check for streams ie
292 if proc/fs/cifs/streamstoxattr is set then
293 search server for EAs or streams to
294 returns as xattrs */
295
296 if (rc == -EINVAL)
297 rc = -EOPNOTSUPP;
298
299out:
300 kfree(full_path);
301 free_xid(xid);
302 cifs_put_tlink(tlink);
303 return rc;
304}
305
306ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
307{
308 ssize_t rc = -EOPNOTSUPP;
309 unsigned int xid;
310 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
311 struct tcon_link *tlink;
312 struct cifs_tcon *pTcon;
313 char *full_path;
314
315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
316 return -EOPNOTSUPP;
317
318 tlink = cifs_sb_tlink(cifs_sb);
319 if (IS_ERR(tlink))
320 return PTR_ERR(tlink);
321 pTcon = tlink_tcon(tlink);
322
323 xid = get_xid();
324
325 full_path = build_path_from_dentry(direntry);
326 if (full_path == NULL) {
327 rc = -ENOMEM;
328 goto list_ea_exit;
329 }
330 /* return dos attributes as pseudo xattr */
331 /* return alt name if available as pseudo attr */
332
333 /* if proc/fs/cifs/streamstoxattr is set then
334 search server for EAs or streams to
335 returns as xattrs */
336
337 if (pTcon->ses->server->ops->query_all_EAs)
338 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
339 full_path, NULL, data, buf_size,
340 cifs_sb->local_nls, cifs_remap(cifs_sb));
341list_ea_exit:
342 kfree(full_path);
343 free_xid(xid);
344 cifs_put_tlink(tlink);
345 return rc;
346}
347
348static const struct xattr_handler cifs_user_xattr_handler = {
349 .prefix = XATTR_USER_PREFIX,
350 .flags = XATTR_USER,
351 .get = cifs_xattr_get,
352 .set = cifs_xattr_set,
353};
354
355/* os2.* attributes are treated like user.* attributes */
356static const struct xattr_handler cifs_os2_xattr_handler = {
357 .prefix = XATTR_OS2_PREFIX,
358 .flags = XATTR_USER,
359 .get = cifs_xattr_get,
360 .set = cifs_xattr_set,
361};
362
363static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
364 .name = CIFS_XATTR_CIFS_ACL,
365 .flags = XATTR_CIFS_ACL,
366 .get = cifs_xattr_get,
367 .set = cifs_xattr_set,
368};
369
370static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
371 .name = XATTR_NAME_POSIX_ACL_ACCESS,
372 .flags = XATTR_ACL_ACCESS,
373 .get = cifs_xattr_get,
374 .set = cifs_xattr_set,
375};
376
377static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
378 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
379 .flags = XATTR_ACL_DEFAULT,
380 .get = cifs_xattr_get,
381 .set = cifs_xattr_set,
382};
383
384const struct xattr_handler *cifs_xattr_handlers[] = {
385 &cifs_user_xattr_handler,
386 &cifs_os2_xattr_handler,
387 &cifs_cifs_acl_xattr_handler,
388 &cifs_posix_acl_access_xattr_handler,
389 &cifs_posix_acl_default_xattr_handler,
390 NULL
391};
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" /* DACL only */
36#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
37#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
38#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
39/*
40 * Although these three are just aliases for the above, need to move away from
41 * confusing users and using the 20+ year old term 'cifs' when it is no longer
42 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
43 */
44#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
45#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
46#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
47#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
48/* BB need to add server (Samba e.g) support for security and trusted prefix */
49
50enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
51 XATTR_CIFS_NTSD };
52
53static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
54 struct inode *inode, char *full_path,
55 const void *value, size_t size)
56{
57 ssize_t rc = -EOPNOTSUPP;
58 __u32 *pattrib = (__u32 *)value;
59 __u32 attrib;
60 FILE_BASIC_INFO info_buf;
61
62 if ((value == NULL) || (size != sizeof(__u32)))
63 return -ERANGE;
64
65 memset(&info_buf, 0, sizeof(info_buf));
66 attrib = *pattrib;
67 info_buf.Attributes = cpu_to_le32(attrib);
68 if (pTcon->ses->server->ops->set_file_info)
69 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
70 &info_buf, xid);
71 if (rc == 0)
72 CIFS_I(inode)->cifsAttrs = attrib;
73
74 return rc;
75}
76
77static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
78 struct inode *inode, char *full_path,
79 const void *value, size_t size)
80{
81 ssize_t rc = -EOPNOTSUPP;
82 __u64 *pcreation_time = (__u64 *)value;
83 __u64 creation_time;
84 FILE_BASIC_INFO info_buf;
85
86 if ((value == NULL) || (size != sizeof(__u64)))
87 return -ERANGE;
88
89 memset(&info_buf, 0, sizeof(info_buf));
90 creation_time = *pcreation_time;
91 info_buf.CreationTime = cpu_to_le64(creation_time);
92 if (pTcon->ses->server->ops->set_file_info)
93 rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
94 &info_buf, xid);
95 if (rc == 0)
96 CIFS_I(inode)->createtime = creation_time;
97
98 return rc;
99}
100
101static int cifs_xattr_set(const struct xattr_handler *handler,
102 struct dentry *dentry, struct inode *inode,
103 const char *name, const void *value,
104 size_t size, int flags)
105{
106 int rc = -EOPNOTSUPP;
107 unsigned int xid;
108 struct super_block *sb = dentry->d_sb;
109 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
110 struct tcon_link *tlink;
111 struct cifs_tcon *pTcon;
112 char *full_path;
113
114 tlink = cifs_sb_tlink(cifs_sb);
115 if (IS_ERR(tlink))
116 return PTR_ERR(tlink);
117 pTcon = tlink_tcon(tlink);
118
119 xid = get_xid();
120
121 full_path = build_path_from_dentry(dentry);
122 if (full_path == NULL) {
123 rc = -ENOMEM;
124 goto out;
125 }
126 /* return dos attributes as pseudo xattr */
127 /* return alt name if available as pseudo attr */
128
129 /* if proc/fs/cifs/streamstoxattr is set then
130 search server for EAs or streams to
131 returns as xattrs */
132 if (size > MAX_EA_VALUE_SIZE) {
133 cifs_dbg(FYI, "size of EA value too large\n");
134 rc = -EOPNOTSUPP;
135 goto out;
136 }
137
138 switch (handler->flags) {
139 case XATTR_USER:
140 cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
141 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
142 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
143 rc = cifs_attrib_set(xid, pTcon, inode, full_path,
144 value, size);
145 if (rc == 0) /* force revalidate of the inode */
146 CIFS_I(inode)->time = 0;
147 break;
148 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
149 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
150 rc = cifs_creation_time_set(xid, pTcon, inode,
151 full_path, value, size);
152 if (rc == 0) /* force revalidate of the inode */
153 CIFS_I(inode)->time = 0;
154 break;
155 }
156
157 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
158 goto out;
159
160 if (pTcon->ses->server->ops->set_EA)
161 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
162 full_path, name, value, (__u16)size,
163 cifs_sb->local_nls, cifs_sb);
164 break;
165
166 case XATTR_CIFS_ACL:
167 case XATTR_CIFS_NTSD: {
168 struct cifs_ntsd *pacl;
169
170 if (!value)
171 goto out;
172 pacl = kmalloc(size, GFP_KERNEL);
173 if (!pacl) {
174 rc = -ENOMEM;
175 } else {
176 memcpy(pacl, value, size);
177 if (value &&
178 pTcon->ses->server->ops->set_acl) {
179 rc = 0;
180 if (handler->flags == XATTR_CIFS_NTSD) {
181 /* set owner and DACL */
182 rc = pTcon->ses->server->ops->set_acl(
183 pacl, size, inode,
184 full_path,
185 CIFS_ACL_OWNER);
186 }
187 if (rc == 0) {
188 /* set DACL */
189 rc = pTcon->ses->server->ops->set_acl(
190 pacl, size, inode,
191 full_path,
192 CIFS_ACL_DACL);
193 }
194 } else {
195 rc = -EOPNOTSUPP;
196 }
197 if (rc == 0) /* force revalidate of the inode */
198 CIFS_I(inode)->time = 0;
199 kfree(pacl);
200 }
201 break;
202 }
203
204 case XATTR_ACL_ACCESS:
205#ifdef CONFIG_CIFS_POSIX
206 if (!value)
207 goto out;
208 if (sb->s_flags & SB_POSIXACL)
209 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
210 value, (const int)size,
211 ACL_TYPE_ACCESS, cifs_sb->local_nls,
212 cifs_remap(cifs_sb));
213#endif /* CONFIG_CIFS_POSIX */
214 break;
215
216 case XATTR_ACL_DEFAULT:
217#ifdef CONFIG_CIFS_POSIX
218 if (!value)
219 goto out;
220 if (sb->s_flags & SB_POSIXACL)
221 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
222 value, (const int)size,
223 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
224 cifs_remap(cifs_sb));
225#endif /* CONFIG_CIFS_POSIX */
226 break;
227 }
228
229out:
230 kfree(full_path);
231 free_xid(xid);
232 cifs_put_tlink(tlink);
233 return rc;
234}
235
236static int cifs_attrib_get(struct dentry *dentry,
237 struct inode *inode, void *value,
238 size_t size)
239{
240 ssize_t rc;
241 __u32 *pattribute;
242
243 rc = cifs_revalidate_dentry_attr(dentry);
244
245 if (rc)
246 return rc;
247
248 if ((value == NULL) || (size == 0))
249 return sizeof(__u32);
250 else if (size < sizeof(__u32))
251 return -ERANGE;
252
253 /* return dos attributes as pseudo xattr */
254 pattribute = (__u32 *)value;
255 *pattribute = CIFS_I(inode)->cifsAttrs;
256
257 return sizeof(__u32);
258}
259
260static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
261 void *value, size_t size)
262{
263 ssize_t rc;
264 __u64 *pcreatetime;
265
266 rc = cifs_revalidate_dentry_attr(dentry);
267 if (rc)
268 return rc;
269
270 if ((value == NULL) || (size == 0))
271 return sizeof(__u64);
272 else if (size < sizeof(__u64))
273 return -ERANGE;
274
275 /* return dos attributes as pseudo xattr */
276 pcreatetime = (__u64 *)value;
277 *pcreatetime = CIFS_I(inode)->createtime;
278 return sizeof(__u64);
279}
280
281
282static int cifs_xattr_get(const struct xattr_handler *handler,
283 struct dentry *dentry, struct inode *inode,
284 const char *name, void *value, size_t size)
285{
286 ssize_t rc = -EOPNOTSUPP;
287 unsigned int xid;
288 struct super_block *sb = dentry->d_sb;
289 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
290 struct tcon_link *tlink;
291 struct cifs_tcon *pTcon;
292 char *full_path;
293
294 tlink = cifs_sb_tlink(cifs_sb);
295 if (IS_ERR(tlink))
296 return PTR_ERR(tlink);
297 pTcon = tlink_tcon(tlink);
298
299 xid = get_xid();
300
301 full_path = build_path_from_dentry(dentry);
302 if (full_path == NULL) {
303 rc = -ENOMEM;
304 goto out;
305 }
306
307 /* return alt name if available as pseudo attr */
308 switch (handler->flags) {
309 case XATTR_USER:
310 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
311 if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
312 (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
313 rc = cifs_attrib_get(dentry, inode, value, size);
314 break;
315 } else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
316 (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
317 rc = cifs_creation_time_get(dentry, inode, value, size);
318 break;
319 }
320
321 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
322 goto out;
323
324 if (pTcon->ses->server->ops->query_all_EAs)
325 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
326 full_path, name, value, size, cifs_sb);
327 break;
328
329 case XATTR_CIFS_ACL:
330 case XATTR_CIFS_NTSD: {
331 /* the whole ntsd is fetched regardless */
332 u32 acllen;
333 struct cifs_ntsd *pacl;
334
335 if (pTcon->ses->server->ops->get_acl == NULL)
336 goto out; /* rc already EOPNOTSUPP */
337
338 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
339 inode, full_path, &acllen);
340 if (IS_ERR(pacl)) {
341 rc = PTR_ERR(pacl);
342 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
343 __func__, rc);
344 } else {
345 if (value) {
346 if (acllen > size)
347 acllen = -ERANGE;
348 else
349 memcpy(value, pacl, acllen);
350 }
351 rc = acllen;
352 kfree(pacl);
353 }
354 break;
355 }
356
357 case XATTR_ACL_ACCESS:
358#ifdef CONFIG_CIFS_POSIX
359 if (sb->s_flags & SB_POSIXACL)
360 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
361 value, size, ACL_TYPE_ACCESS,
362 cifs_sb->local_nls,
363 cifs_remap(cifs_sb));
364#endif /* CONFIG_CIFS_POSIX */
365 break;
366
367 case XATTR_ACL_DEFAULT:
368#ifdef CONFIG_CIFS_POSIX
369 if (sb->s_flags & SB_POSIXACL)
370 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
371 value, size, ACL_TYPE_DEFAULT,
372 cifs_sb->local_nls,
373 cifs_remap(cifs_sb));
374#endif /* CONFIG_CIFS_POSIX */
375 break;
376 }
377
378 /* We could add an additional check for streams ie
379 if proc/fs/cifs/streamstoxattr is set then
380 search server for EAs or streams to
381 returns as xattrs */
382
383 if (rc == -EINVAL)
384 rc = -EOPNOTSUPP;
385
386out:
387 kfree(full_path);
388 free_xid(xid);
389 cifs_put_tlink(tlink);
390 return rc;
391}
392
393ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
394{
395 ssize_t rc = -EOPNOTSUPP;
396 unsigned int xid;
397 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
398 struct tcon_link *tlink;
399 struct cifs_tcon *pTcon;
400 char *full_path;
401
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
403 return -EOPNOTSUPP;
404
405 tlink = cifs_sb_tlink(cifs_sb);
406 if (IS_ERR(tlink))
407 return PTR_ERR(tlink);
408 pTcon = tlink_tcon(tlink);
409
410 xid = get_xid();
411
412 full_path = build_path_from_dentry(direntry);
413 if (full_path == NULL) {
414 rc = -ENOMEM;
415 goto list_ea_exit;
416 }
417 /* return dos attributes as pseudo xattr */
418 /* return alt name if available as pseudo attr */
419
420 /* if proc/fs/cifs/streamstoxattr is set then
421 search server for EAs or streams to
422 returns as xattrs */
423
424 if (pTcon->ses->server->ops->query_all_EAs)
425 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
426 full_path, NULL, data, buf_size, cifs_sb);
427list_ea_exit:
428 kfree(full_path);
429 free_xid(xid);
430 cifs_put_tlink(tlink);
431 return rc;
432}
433
434static const struct xattr_handler cifs_user_xattr_handler = {
435 .prefix = XATTR_USER_PREFIX,
436 .flags = XATTR_USER,
437 .get = cifs_xattr_get,
438 .set = cifs_xattr_set,
439};
440
441/* os2.* attributes are treated like user.* attributes */
442static const struct xattr_handler cifs_os2_xattr_handler = {
443 .prefix = XATTR_OS2_PREFIX,
444 .flags = XATTR_USER,
445 .get = cifs_xattr_get,
446 .set = cifs_xattr_set,
447};
448
449static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
450 .name = CIFS_XATTR_CIFS_ACL,
451 .flags = XATTR_CIFS_ACL,
452 .get = cifs_xattr_get,
453 .set = cifs_xattr_set,
454};
455
456/*
457 * Although this is just an alias for the above, need to move away from
458 * confusing users and using the 20 year old term 'cifs' when it is no
459 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
460 * SMB3 and later are highly secure.
461 */
462static const struct xattr_handler smb3_acl_xattr_handler = {
463 .name = SMB3_XATTR_CIFS_ACL,
464 .flags = XATTR_CIFS_ACL,
465 .get = cifs_xattr_get,
466 .set = cifs_xattr_set,
467};
468
469static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
470 .name = CIFS_XATTR_CIFS_NTSD,
471 .flags = XATTR_CIFS_NTSD,
472 .get = cifs_xattr_get,
473 .set = cifs_xattr_set,
474};
475
476/*
477 * Although this is just an alias for the above, need to move away from
478 * confusing users and using the 20 year old term 'cifs' when it is no
479 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
480 * SMB3 and later are highly secure.
481 */
482static const struct xattr_handler smb3_ntsd_xattr_handler = {
483 .name = SMB3_XATTR_CIFS_NTSD,
484 .flags = XATTR_CIFS_NTSD,
485 .get = cifs_xattr_get,
486 .set = cifs_xattr_set,
487};
488
489static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
490 .name = XATTR_NAME_POSIX_ACL_ACCESS,
491 .flags = XATTR_ACL_ACCESS,
492 .get = cifs_xattr_get,
493 .set = cifs_xattr_set,
494};
495
496static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
497 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
498 .flags = XATTR_ACL_DEFAULT,
499 .get = cifs_xattr_get,
500 .set = cifs_xattr_set,
501};
502
503const struct xattr_handler *cifs_xattr_handlers[] = {
504 &cifs_user_xattr_handler,
505 &cifs_os2_xattr_handler,
506 &cifs_cifs_acl_xattr_handler,
507 &smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
508 &cifs_cifs_ntsd_xattr_handler,
509 &smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
510 &cifs_posix_acl_access_xattr_handler,
511 &cifs_posix_acl_default_xattr_handler,
512 NULL
513};