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Commit | Line | Data |
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a55370a3 | 1 | /* |
a55370a3 N |
2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
3 | * All rights reserved. | |
4 | * | |
5 | * Andy Adamson <andros@citi.umich.edu> | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the name of the University nor the names of its | |
17 | * contributors may be used to endorse or promote products derived | |
18 | * from this software without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
23 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
27 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
28 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | * | |
32 | */ | |
33 | ||
190e4fbf | 34 | #include <linux/file.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
190e4fbf | 36 | #include <linux/namei.h> |
a55370a3 | 37 | #include <linux/crypto.h> |
e8edc6e0 | 38 | #include <linux/sched.h> |
9a74af21 BH |
39 | |
40 | #include "nfsd.h" | |
41 | #include "state.h" | |
0a3adade | 42 | #include "vfs.h" |
a55370a3 N |
43 | |
44 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
45 | ||
190e4fbf | 46 | /* Globals */ |
e970a573 | 47 | static struct file *rec_file; |
190e4fbf | 48 | |
d84f4f99 DH |
49 | static int |
50 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 51 | { |
d84f4f99 DH |
52 | struct cred *new; |
53 | ||
54 | new = prepare_creds(); | |
55 | if (!new) | |
56 | return -ENOMEM; | |
57 | ||
58 | new->fsuid = 0; | |
59 | new->fsgid = 0; | |
60 | *original_creds = override_creds(new); | |
61 | put_cred(new); | |
62 | return 0; | |
190e4fbf N |
63 | } |
64 | ||
65 | static void | |
d84f4f99 | 66 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 67 | { |
d84f4f99 | 68 | revert_creds(original); |
190e4fbf N |
69 | } |
70 | ||
a55370a3 N |
71 | static void |
72 | md5_to_hex(char *out, char *md5) | |
73 | { | |
74 | int i; | |
75 | ||
76 | for (i=0; i<16; i++) { | |
77 | unsigned char c = md5[i]; | |
78 | ||
79 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
80 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
81 | } | |
82 | *out = '\0'; | |
83 | } | |
84 | ||
b37ad28b | 85 | __be32 |
a55370a3 N |
86 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
87 | { | |
88 | struct xdr_netobj cksum; | |
35058687 | 89 | struct hash_desc desc; |
60c74f81 | 90 | struct scatterlist sg; |
b37ad28b | 91 | __be32 status = nfserr_resource; |
a55370a3 N |
92 | |
93 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
94 | clname->len, clname->data); | |
35058687 HX |
95 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
96 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
97 | if (IS_ERR(desc.tfm)) | |
98 | goto out_no_tfm; | |
99 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
100 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
101 | if (cksum.data == NULL) | |
102 | goto out; | |
a55370a3 | 103 | |
60c74f81 | 104 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 105 | |
60c74f81 | 106 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 107 | goto out; |
a55370a3 N |
108 | |
109 | md5_to_hex(dname, cksum.data); | |
110 | ||
a55370a3 N |
111 | status = nfs_ok; |
112 | out: | |
2bd9e7b6 | 113 | kfree(cksum.data); |
35058687 HX |
114 | crypto_free_hash(desc.tfm); |
115 | out_no_tfm: | |
a55370a3 N |
116 | return status; |
117 | } | |
190e4fbf | 118 | |
c7b9a459 N |
119 | int |
120 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
121 | { | |
d84f4f99 | 122 | const struct cred *original_cred; |
c7b9a459 | 123 | char *dname = clp->cl_recdir; |
e970a573 | 124 | struct dentry *dir, *dentry; |
c7b9a459 N |
125 | int status; |
126 | ||
127 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
128 | ||
e970a573 | 129 | if (!rec_file || clp->cl_firststate) |
c7b9a459 N |
130 | return 0; |
131 | ||
d84f4f99 DH |
132 | status = nfs4_save_creds(&original_cred); |
133 | if (status < 0) | |
134 | return status; | |
c7b9a459 | 135 | |
e970a573 | 136 | dir = rec_file->f_path.dentry; |
c7b9a459 | 137 | /* lock the parent */ |
e970a573 | 138 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 139 | |
e970a573 | 140 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
141 | if (IS_ERR(dentry)) { |
142 | status = PTR_ERR(dentry); | |
143 | goto out_unlock; | |
144 | } | |
145 | status = -EEXIST; | |
146 | if (dentry->d_inode) { | |
147 | dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n"); | |
148 | goto out_put; | |
149 | } | |
e970a573 | 150 | status = mnt_want_write(rec_file->f_path.mnt); |
463c3197 DH |
151 | if (status) |
152 | goto out_put; | |
e970a573 CH |
153 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
154 | mnt_drop_write(rec_file->f_path.mnt); | |
c7b9a459 N |
155 | out_put: |
156 | dput(dentry); | |
157 | out_unlock: | |
e970a573 | 158 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
159 | if (status == 0) { |
160 | clp->cl_firststate = 1; | |
e970a573 | 161 | vfs_fsync(rec_file, rec_file->f_path.dentry, 0); |
c7b9a459 | 162 | } |
d84f4f99 | 163 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
164 | dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status); |
165 | return status; | |
166 | } | |
167 | ||
190e4fbf N |
168 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
169 | ||
05f4f678 BF |
170 | struct name_list { |
171 | char name[HEXDIR_LEN]; | |
190e4fbf N |
172 | struct list_head list; |
173 | }; | |
174 | ||
190e4fbf | 175 | static int |
05f4f678 | 176 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 177 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 178 | { |
05f4f678 BF |
179 | struct list_head *names = arg; |
180 | struct name_list *entry; | |
190e4fbf | 181 | |
05f4f678 | 182 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 183 | return 0; |
05f4f678 BF |
184 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
185 | if (entry == NULL) | |
190e4fbf | 186 | return -ENOMEM; |
05f4f678 BF |
187 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
188 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
189 | list_add(&entry->list, names); | |
190e4fbf N |
190 | return 0; |
191 | } | |
192 | ||
193 | static int | |
194 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
195 | { | |
d84f4f99 | 196 | const struct cred *original_cred; |
190e4fbf | 197 | struct file *filp; |
05f4f678 BF |
198 | LIST_HEAD(names); |
199 | struct name_list *entry; | |
200 | struct dentry *dentry; | |
190e4fbf N |
201 | int status; |
202 | ||
e970a573 | 203 | if (!rec_file) |
190e4fbf N |
204 | return 0; |
205 | ||
d84f4f99 DH |
206 | status = nfs4_save_creds(&original_cred); |
207 | if (status < 0) | |
208 | return status; | |
190e4fbf | 209 | |
e970a573 | 210 | filp = dentry_open(dget(dir), mntget(rec_file->f_path.mnt), O_RDONLY, |
745ca247 | 211 | current_cred()); |
190e4fbf N |
212 | status = PTR_ERR(filp); |
213 | if (IS_ERR(filp)) | |
214 | goto out; | |
05f4f678 | 215 | status = vfs_readdir(filp, nfsd4_build_namelist, &names); |
190e4fbf | 216 | fput(filp); |
8daed1e5 | 217 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 BF |
218 | while (!list_empty(&names)) { |
219 | entry = list_entry(names.next, struct name_list, list); | |
220 | ||
221 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
222 | if (IS_ERR(dentry)) { | |
223 | status = PTR_ERR(dentry); | |
2f9092e1 | 224 | break; |
05f4f678 BF |
225 | } |
226 | status = f(dir, dentry); | |
227 | dput(dentry); | |
190e4fbf | 228 | if (status) |
2f9092e1 | 229 | break; |
05f4f678 BF |
230 | list_del(&entry->list); |
231 | kfree(entry); | |
190e4fbf | 232 | } |
2f9092e1 | 233 | mutex_unlock(&dir->d_inode->i_mutex); |
190e4fbf | 234 | out: |
05f4f678 BF |
235 | while (!list_empty(&names)) { |
236 | entry = list_entry(names.next, struct name_list, list); | |
237 | list_del(&entry->list); | |
238 | kfree(entry); | |
190e4fbf | 239 | } |
d84f4f99 | 240 | nfs4_reset_creds(original_cred); |
190e4fbf N |
241 | return status; |
242 | } | |
243 | ||
c7b9a459 N |
244 | static int |
245 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
246 | { | |
e970a573 | 247 | struct dentry *dir, *dentry; |
c7b9a459 N |
248 | int status; |
249 | ||
250 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
251 | ||
e970a573 CH |
252 | dir = rec_file->f_path.dentry; |
253 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); | |
254 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
255 | if (IS_ERR(dentry)) { |
256 | status = PTR_ERR(dentry); | |
2f9092e1 | 257 | goto out_unlock; |
c7b9a459 N |
258 | } |
259 | status = -ENOENT; | |
260 | if (!dentry->d_inode) | |
261 | goto out; | |
e970a573 | 262 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
263 | out: |
264 | dput(dentry); | |
2f9092e1 | 265 | out_unlock: |
e970a573 | 266 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
267 | return status; |
268 | } | |
269 | ||
270 | void | |
271 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
272 | { | |
d84f4f99 | 273 | const struct cred *original_cred; |
c7b9a459 N |
274 | int status; |
275 | ||
e970a573 | 276 | if (!rec_file || !clp->cl_firststate) |
c7b9a459 N |
277 | return; |
278 | ||
e970a573 | 279 | status = mnt_want_write(rec_file->f_path.mnt); |
0622753b DH |
280 | if (status) |
281 | goto out; | |
67be4313 | 282 | clp->cl_firststate = 0; |
d84f4f99 DH |
283 | |
284 | status = nfs4_save_creds(&original_cred); | |
285 | if (status < 0) | |
286 | goto out; | |
287 | ||
c7b9a459 | 288 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 289 | nfs4_reset_creds(original_cred); |
c7b9a459 | 290 | if (status == 0) |
e970a573 CH |
291 | vfs_fsync(rec_file, rec_file->f_path.dentry, 0); |
292 | mnt_drop_write(rec_file->f_path.mnt); | |
0622753b | 293 | out: |
c7b9a459 N |
294 | if (status) |
295 | printk("NFSD: Failed to remove expired client state directory" | |
296 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
297 | return; | |
298 | } | |
299 | ||
300 | static int | |
301 | purge_old(struct dentry *parent, struct dentry *child) | |
302 | { | |
303 | int status; | |
304 | ||
a1bcecd2 AA |
305 | /* note: we currently use this path only for minorversion 0 */ |
306 | if (nfs4_has_reclaimed_state(child->d_name.name, false)) | |
b37ad28b | 307 | return 0; |
c7b9a459 | 308 | |
2f9092e1 | 309 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
310 | if (status) |
311 | printk("failed to remove client recovery directory %s\n", | |
312 | child->d_name.name); | |
313 | /* Keep trying, success or failure: */ | |
b37ad28b | 314 | return 0; |
c7b9a459 N |
315 | } |
316 | ||
317 | void | |
318 | nfsd4_recdir_purge_old(void) { | |
319 | int status; | |
320 | ||
e970a573 | 321 | if (!rec_file) |
c7b9a459 | 322 | return; |
e970a573 | 323 | status = mnt_want_write(rec_file->f_path.mnt); |
0622753b DH |
324 | if (status) |
325 | goto out; | |
e970a573 | 326 | status = nfsd4_list_rec_dir(rec_file->f_path.dentry, purge_old); |
c7b9a459 | 327 | if (status == 0) |
e970a573 CH |
328 | vfs_fsync(rec_file, rec_file->f_path.dentry, 0); |
329 | mnt_drop_write(rec_file->f_path.mnt); | |
0622753b | 330 | out: |
c7b9a459 N |
331 | if (status) |
332 | printk("nfsd4: failed to purge old clients from recovery" | |
e970a573 | 333 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
334 | } |
335 | ||
190e4fbf N |
336 | static int |
337 | load_recdir(struct dentry *parent, struct dentry *child) | |
338 | { | |
339 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
340 | printk("nfsd4: illegal name %s in recovery directory\n", | |
341 | child->d_name.name); | |
342 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 343 | return 0; |
190e4fbf N |
344 | } |
345 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 346 | return 0; |
190e4fbf N |
347 | } |
348 | ||
349 | int | |
350 | nfsd4_recdir_load(void) { | |
351 | int status; | |
352 | ||
e970a573 CH |
353 | if (!rec_file) |
354 | return 0; | |
355 | ||
356 | status = nfsd4_list_rec_dir(rec_file->f_path.dentry, load_recdir); | |
190e4fbf N |
357 | if (status) |
358 | printk("nfsd4: failed loading clients from recovery" | |
e970a573 | 359 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
360 | return status; |
361 | } | |
362 | ||
363 | /* | |
364 | * Hold reference to the recovery directory. | |
365 | */ | |
366 | ||
367 | void | |
368 | nfsd4_init_recdir(char *rec_dirname) | |
369 | { | |
d84f4f99 DH |
370 | const struct cred *original_cred; |
371 | int status; | |
190e4fbf N |
372 | |
373 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
374 | rec_dirname); | |
375 | ||
e970a573 | 376 | BUG_ON(rec_file); |
190e4fbf | 377 | |
d84f4f99 DH |
378 | status = nfs4_save_creds(&original_cred); |
379 | if (status < 0) { | |
380 | printk("NFSD: Unable to change credentials to find recovery" | |
381 | " directory: error %d\n", | |
382 | status); | |
383 | return; | |
384 | } | |
190e4fbf | 385 | |
e970a573 CH |
386 | rec_file = filp_open(rec_dirname, O_RDONLY | O_DIRECTORY, 0); |
387 | if (IS_ERR(rec_file)) { | |
c2642ab0 | 388 | printk("NFSD: unable to find recovery directory %s\n", |
190e4fbf | 389 | rec_dirname); |
e970a573 CH |
390 | rec_file = NULL; |
391 | } | |
190e4fbf | 392 | |
d84f4f99 | 393 | nfs4_reset_creds(original_cred); |
190e4fbf N |
394 | } |
395 | ||
396 | void | |
397 | nfsd4_shutdown_recdir(void) | |
398 | { | |
e970a573 | 399 | if (!rec_file) |
190e4fbf | 400 | return; |
e970a573 CH |
401 | fput(rec_file); |
402 | rec_file = NULL; | |
190e4fbf | 403 | } |