1 /*
2 * fs/cifs/ioctl.c
3 *
4 * vfs operations that deal with io control
5 *
6 * Copyright (C) International Business Machines Corp., 2005,2013
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/fs.h>
25 #include <linux/file.h>
26 #include <linux/mount.h>
27 #include <linux/mm.h>
28 #include <linux/pagemap.h>
29 #include "cifspdu.h"
30 #include "cifsglob.h"
31 #include "cifsproto.h"
32 #include "cifs_debug.h"
33 #include "cifsfs.h"
34 #include "cifs_ioctl.h"
35 #include "smb2proto.h"
36 #include <linux/btrfs.h>
37
cifs_ioctl_query_info(unsigned int xid,struct file * filep,unsigned long p)38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
39 unsigned long p)
40 {
41 struct inode *inode = file_inode(filep);
42 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
44 struct dentry *dentry = filep->f_path.dentry;
45 unsigned char *path;
46 __le16 *utf16_path = NULL, root_path;
47 int rc = 0;
48
49 path = build_path_from_dentry(dentry);
50 if (path == NULL)
51 return -ENOMEM;
52
53 cifs_dbg(FYI, "%s %s\n", __func__, path);
54
55 if (!path[0]) {
56 root_path = 0;
57 utf16_path = &root_path;
58 } else {
59 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
60 if (!utf16_path) {
61 rc = -ENOMEM;
62 goto ici_exit;
63 }
64 }
65
66 if (tcon->ses->server->ops->ioctl_query_info)
67 rc = tcon->ses->server->ops->ioctl_query_info(
68 xid, tcon, cifs_sb, utf16_path,
69 filep->private_data ? 0 : 1, p);
70 else
71 rc = -EOPNOTSUPP;
72
73 ici_exit:
74 if (utf16_path != &root_path)
75 kfree(utf16_path);
76 kfree(path);
77 return rc;
78 }
79
cifs_ioctl_copychunk(unsigned int xid,struct file * dst_file,unsigned long srcfd)80 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
81 unsigned long srcfd)
82 {
83 int rc;
84 struct fd src_file;
85 struct inode *src_inode;
86
87 cifs_dbg(FYI, "ioctl copychunk range\n");
88 /* the destination must be opened for writing */
89 if (!(dst_file->f_mode & FMODE_WRITE)) {
90 cifs_dbg(FYI, "file target not open for write\n");
91 return -EINVAL;
92 }
93
94 /* check if target volume is readonly and take reference */
95 rc = mnt_want_write_file(dst_file);
96 if (rc) {
97 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
98 return rc;
99 }
100
101 src_file = fdget(srcfd);
102 if (!src_file.file) {
103 rc = -EBADF;
104 goto out_drop_write;
105 }
106
107 if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
108 rc = -EBADF;
109 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
110 goto out_fput;
111 }
112
113 src_inode = file_inode(src_file.file);
114 rc = -EINVAL;
115 if (S_ISDIR(src_inode->i_mode))
116 goto out_fput;
117
118 rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
119 src_inode->i_size, 0);
120 if (rc > 0)
121 rc = 0;
122 out_fput:
123 fdput(src_file);
124 out_drop_write:
125 mnt_drop_write_file(dst_file);
126 return rc;
127 }
128
smb_mnt_get_fsinfo(unsigned int xid,struct cifs_tcon * tcon,void __user * arg)129 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
130 void __user *arg)
131 {
132 int rc = 0;
133 struct smb_mnt_fs_info *fsinf;
134
135 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
136 if (fsinf == NULL)
137 return -ENOMEM;
138
139 fsinf->version = 1;
140 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
141 fsinf->device_characteristics =
142 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
143 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
144 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
145 fsinf->max_path_component =
146 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
147 fsinf->vol_serial_number = tcon->vol_serial_number;
148 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
149 fsinf->share_flags = tcon->share_flags;
150 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
151 fsinf->sector_flags = tcon->ss_flags;
152 fsinf->optimal_sector_size = tcon->perf_sector_size;
153 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
154 fsinf->maximal_access = tcon->maximal_access;
155 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
156
157 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
158 rc = -EFAULT;
159
160 kfree(fsinf);
161 return rc;
162 }
163
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)164 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
165 {
166 struct inode *inode = file_inode(filep);
167 struct smb3_key_debug_info pkey_inf;
168 int rc = -ENOTTY; /* strange error - but the precedent */
169 unsigned int xid;
170 struct cifsFileInfo *pSMBFile = filep->private_data;
171 struct cifs_tcon *tcon;
172 struct tcon_link *tlink;
173 struct cifs_sb_info *cifs_sb;
174 __u64 ExtAttrBits = 0;
175 __u64 caps;
176
177 xid = get_xid();
178
179 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
180 switch (command) {
181 case FS_IOC_GETFLAGS:
182 if (pSMBFile == NULL)
183 break;
184 tcon = tlink_tcon(pSMBFile->tlink);
185 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
186 #ifdef CONFIG_CIFS_POSIX
187 if (CIFS_UNIX_EXTATTR_CAP & caps) {
188 __u64 ExtAttrMask = 0;
189 rc = CIFSGetExtAttr(xid, tcon,
190 pSMBFile->fid.netfid,
191 &ExtAttrBits, &ExtAttrMask);
192 if (rc == 0)
193 rc = put_user(ExtAttrBits &
194 FS_FL_USER_VISIBLE,
195 (int __user *)arg);
196 if (rc != EOPNOTSUPP)
197 break;
198 }
199 #endif /* CONFIG_CIFS_POSIX */
200 rc = 0;
201 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
202 /* add in the compressed bit */
203 ExtAttrBits = FS_COMPR_FL;
204 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
205 (int __user *)arg);
206 }
207 break;
208 case FS_IOC_SETFLAGS:
209 if (pSMBFile == NULL)
210 break;
211 tcon = tlink_tcon(pSMBFile->tlink);
212 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
213
214 if (get_user(ExtAttrBits, (int __user *)arg)) {
215 rc = -EFAULT;
216 break;
217 }
218
219 /*
220 * if (CIFS_UNIX_EXTATTR_CAP & caps)
221 * rc = CIFSSetExtAttr(xid, tcon,
222 * pSMBFile->fid.netfid,
223 * extAttrBits,
224 * &ExtAttrMask);
225 * if (rc != EOPNOTSUPP)
226 * break;
227 */
228
229 /* Currently only flag we can set is compressed flag */
230 if ((ExtAttrBits & FS_COMPR_FL) == 0)
231 break;
232
233 /* Try to set compress flag */
234 if (tcon->ses->server->ops->set_compression) {
235 rc = tcon->ses->server->ops->set_compression(
236 xid, tcon, pSMBFile);
237 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
238 }
239 break;
240 case CIFS_IOC_COPYCHUNK_FILE:
241 rc = cifs_ioctl_copychunk(xid, filep, arg);
242 break;
243 case CIFS_QUERY_INFO:
244 rc = cifs_ioctl_query_info(xid, filep, arg);
245 break;
246 case CIFS_IOC_SET_INTEGRITY:
247 if (pSMBFile == NULL)
248 break;
249 tcon = tlink_tcon(pSMBFile->tlink);
250 if (tcon->ses->server->ops->set_integrity)
251 rc = tcon->ses->server->ops->set_integrity(xid,
252 tcon, pSMBFile);
253 else
254 rc = -EOPNOTSUPP;
255 break;
256 case CIFS_IOC_GET_MNT_INFO:
257 if (pSMBFile == NULL)
258 break;
259 tcon = tlink_tcon(pSMBFile->tlink);
260 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
261 break;
262 case CIFS_ENUMERATE_SNAPSHOTS:
263 if (pSMBFile == NULL)
264 break;
265 if (arg == 0) {
266 rc = -EINVAL;
267 goto cifs_ioc_exit;
268 }
269 tcon = tlink_tcon(pSMBFile->tlink);
270 if (tcon->ses->server->ops->enum_snapshots)
271 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
272 pSMBFile, (void __user *)arg);
273 else
274 rc = -EOPNOTSUPP;
275 break;
276 case CIFS_DUMP_KEY:
277 if (pSMBFile == NULL)
278 break;
279 if (!capable(CAP_SYS_ADMIN)) {
280 rc = -EACCES;
281 break;
282 }
283
284 tcon = tlink_tcon(pSMBFile->tlink);
285 if (!smb3_encryption_required(tcon)) {
286 rc = -EOPNOTSUPP;
287 break;
288 }
289 pkey_inf.cipher_type =
290 le16_to_cpu(tcon->ses->server->cipher_type);
291 pkey_inf.Suid = tcon->ses->Suid;
292 memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
293 16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
294 memcpy(pkey_inf.smb3decryptionkey,
295 tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
296 memcpy(pkey_inf.smb3encryptionkey,
297 tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
298 if (copy_to_user((void __user *)arg, &pkey_inf,
299 sizeof(struct smb3_key_debug_info)))
300 rc = -EFAULT;
301 else
302 rc = 0;
303 break;
304 case CIFS_IOC_NOTIFY:
305 if (!S_ISDIR(inode->i_mode)) {
306 /* Notify can only be done on directories */
307 rc = -EOPNOTSUPP;
308 break;
309 }
310 cifs_sb = CIFS_SB(inode->i_sb);
311 tlink = cifs_sb_tlink(cifs_sb);
312 if (IS_ERR(tlink)) {
313 rc = PTR_ERR(tlink);
314 break;
315 }
316 tcon = tlink_tcon(tlink);
317 if (tcon && tcon->ses->server->ops->notify) {
318 rc = tcon->ses->server->ops->notify(xid,
319 filep, (void __user *)arg);
320 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
321 } else
322 rc = -EOPNOTSUPP;
323 cifs_put_tlink(tlink);
324 break;
325 default:
326 cifs_dbg(FYI, "unsupported ioctl\n");
327 break;
328 }
329 cifs_ioc_exit:
330 free_xid(xid);
331 return rc;
332 }
333