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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 */ |
a63bb996 | 47 | static struct path rec_dir; |
190e4fbf N |
48 | static int rec_dir_init = 0; |
49 | ||
d84f4f99 DH |
50 | static int |
51 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 52 | { |
d84f4f99 DH |
53 | struct cred *new; |
54 | ||
55 | new = prepare_creds(); | |
56 | if (!new) | |
57 | return -ENOMEM; | |
58 | ||
59 | new->fsuid = 0; | |
60 | new->fsgid = 0; | |
61 | *original_creds = override_creds(new); | |
62 | put_cred(new); | |
63 | return 0; | |
190e4fbf N |
64 | } |
65 | ||
66 | static void | |
d84f4f99 | 67 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 68 | { |
d84f4f99 | 69 | revert_creds(original); |
190e4fbf N |
70 | } |
71 | ||
a55370a3 N |
72 | static void |
73 | md5_to_hex(char *out, char *md5) | |
74 | { | |
75 | int i; | |
76 | ||
77 | for (i=0; i<16; i++) { | |
78 | unsigned char c = md5[i]; | |
79 | ||
80 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
81 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
82 | } | |
83 | *out = '\0'; | |
84 | } | |
85 | ||
b37ad28b | 86 | __be32 |
a55370a3 N |
87 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
88 | { | |
89 | struct xdr_netobj cksum; | |
35058687 | 90 | struct hash_desc desc; |
60c74f81 | 91 | struct scatterlist sg; |
b37ad28b | 92 | __be32 status = nfserr_resource; |
a55370a3 N |
93 | |
94 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
95 | clname->len, clname->data); | |
35058687 HX |
96 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
97 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
98 | if (IS_ERR(desc.tfm)) | |
99 | goto out_no_tfm; | |
100 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
101 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
102 | if (cksum.data == NULL) | |
103 | goto out; | |
a55370a3 | 104 | |
60c74f81 | 105 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 106 | |
60c74f81 | 107 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 108 | goto out; |
a55370a3 N |
109 | |
110 | md5_to_hex(dname, cksum.data); | |
111 | ||
a55370a3 N |
112 | status = nfs_ok; |
113 | out: | |
2bd9e7b6 | 114 | kfree(cksum.data); |
35058687 HX |
115 | crypto_free_hash(desc.tfm); |
116 | out_no_tfm: | |
a55370a3 N |
117 | return status; |
118 | } | |
190e4fbf | 119 | |
a6ccbbb8 N |
120 | static void |
121 | nfsd4_sync_rec_dir(void) | |
c7b9a459 | 122 | { |
f501912a | 123 | vfs_fsync(NULL, rec_dir.dentry, 0); |
c7b9a459 N |
124 | } |
125 | ||
126 | int | |
127 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
128 | { | |
d84f4f99 | 129 | const struct cred *original_cred; |
c7b9a459 N |
130 | char *dname = clp->cl_recdir; |
131 | struct dentry *dentry; | |
c7b9a459 N |
132 | int status; |
133 | ||
134 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
135 | ||
136 | if (!rec_dir_init || clp->cl_firststate) | |
137 | return 0; | |
138 | ||
d84f4f99 DH |
139 | status = nfs4_save_creds(&original_cred); |
140 | if (status < 0) | |
141 | return status; | |
c7b9a459 N |
142 | |
143 | /* lock the parent */ | |
a63bb996 | 144 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 | 145 | |
a63bb996 | 146 | dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1); |
c7b9a459 N |
147 | if (IS_ERR(dentry)) { |
148 | status = PTR_ERR(dentry); | |
149 | goto out_unlock; | |
150 | } | |
151 | status = -EEXIST; | |
152 | if (dentry->d_inode) { | |
153 | dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n"); | |
154 | goto out_put; | |
155 | } | |
a63bb996 | 156 | status = mnt_want_write(rec_dir.mnt); |
463c3197 DH |
157 | if (status) |
158 | goto out_put; | |
a63bb996 AV |
159 | status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU); |
160 | mnt_drop_write(rec_dir.mnt); | |
c7b9a459 N |
161 | out_put: |
162 | dput(dentry); | |
163 | out_unlock: | |
a63bb996 | 164 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
165 | if (status == 0) { |
166 | clp->cl_firststate = 1; | |
a6ccbbb8 | 167 | nfsd4_sync_rec_dir(); |
c7b9a459 | 168 | } |
d84f4f99 | 169 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
170 | dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status); |
171 | return status; | |
172 | } | |
173 | ||
190e4fbf N |
174 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
175 | ||
05f4f678 BF |
176 | struct name_list { |
177 | char name[HEXDIR_LEN]; | |
190e4fbf N |
178 | struct list_head list; |
179 | }; | |
180 | ||
190e4fbf | 181 | static int |
05f4f678 | 182 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 183 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 184 | { |
05f4f678 BF |
185 | struct list_head *names = arg; |
186 | struct name_list *entry; | |
190e4fbf | 187 | |
05f4f678 | 188 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 189 | return 0; |
05f4f678 BF |
190 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
191 | if (entry == NULL) | |
190e4fbf | 192 | return -ENOMEM; |
05f4f678 BF |
193 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
194 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
195 | list_add(&entry->list, names); | |
190e4fbf N |
196 | return 0; |
197 | } | |
198 | ||
199 | static int | |
200 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
201 | { | |
d84f4f99 | 202 | const struct cred *original_cred; |
190e4fbf | 203 | struct file *filp; |
05f4f678 BF |
204 | LIST_HEAD(names); |
205 | struct name_list *entry; | |
206 | struct dentry *dentry; | |
190e4fbf N |
207 | int status; |
208 | ||
209 | if (!rec_dir_init) | |
210 | return 0; | |
211 | ||
d84f4f99 DH |
212 | status = nfs4_save_creds(&original_cred); |
213 | if (status < 0) | |
214 | return status; | |
190e4fbf | 215 | |
745ca247 DH |
216 | filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY, |
217 | current_cred()); | |
190e4fbf N |
218 | status = PTR_ERR(filp); |
219 | if (IS_ERR(filp)) | |
220 | goto out; | |
05f4f678 | 221 | status = vfs_readdir(filp, nfsd4_build_namelist, &names); |
190e4fbf | 222 | fput(filp); |
8daed1e5 | 223 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 BF |
224 | while (!list_empty(&names)) { |
225 | entry = list_entry(names.next, struct name_list, list); | |
226 | ||
227 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
228 | if (IS_ERR(dentry)) { | |
229 | status = PTR_ERR(dentry); | |
2f9092e1 | 230 | break; |
05f4f678 BF |
231 | } |
232 | status = f(dir, dentry); | |
233 | dput(dentry); | |
190e4fbf | 234 | if (status) |
2f9092e1 | 235 | break; |
05f4f678 BF |
236 | list_del(&entry->list); |
237 | kfree(entry); | |
190e4fbf | 238 | } |
2f9092e1 | 239 | mutex_unlock(&dir->d_inode->i_mutex); |
190e4fbf | 240 | out: |
05f4f678 BF |
241 | while (!list_empty(&names)) { |
242 | entry = list_entry(names.next, struct name_list, list); | |
243 | list_del(&entry->list); | |
244 | kfree(entry); | |
190e4fbf | 245 | } |
d84f4f99 | 246 | nfs4_reset_creds(original_cred); |
190e4fbf N |
247 | return status; |
248 | } | |
249 | ||
c7b9a459 N |
250 | static int |
251 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
252 | { | |
253 | struct dentry *dentry; | |
254 | int status; | |
255 | ||
256 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
257 | ||
8daed1e5 | 258 | mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
a63bb996 | 259 | dentry = lookup_one_len(name, rec_dir.dentry, namlen); |
c7b9a459 N |
260 | if (IS_ERR(dentry)) { |
261 | status = PTR_ERR(dentry); | |
2f9092e1 | 262 | goto out_unlock; |
c7b9a459 N |
263 | } |
264 | status = -ENOENT; | |
265 | if (!dentry->d_inode) | |
266 | goto out; | |
2f9092e1 | 267 | status = vfs_rmdir(rec_dir.dentry->d_inode, dentry); |
c7b9a459 N |
268 | out: |
269 | dput(dentry); | |
2f9092e1 DW |
270 | out_unlock: |
271 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); | |
c7b9a459 N |
272 | return status; |
273 | } | |
274 | ||
275 | void | |
276 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
277 | { | |
d84f4f99 | 278 | const struct cred *original_cred; |
c7b9a459 N |
279 | int status; |
280 | ||
281 | if (!rec_dir_init || !clp->cl_firststate) | |
282 | return; | |
283 | ||
a63bb996 | 284 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
285 | if (status) |
286 | goto out; | |
67be4313 | 287 | clp->cl_firststate = 0; |
d84f4f99 DH |
288 | |
289 | status = nfs4_save_creds(&original_cred); | |
290 | if (status < 0) | |
291 | goto out; | |
292 | ||
c7b9a459 | 293 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 294 | nfs4_reset_creds(original_cred); |
c7b9a459 | 295 | if (status == 0) |
a6ccbbb8 | 296 | nfsd4_sync_rec_dir(); |
a63bb996 | 297 | mnt_drop_write(rec_dir.mnt); |
0622753b | 298 | out: |
c7b9a459 N |
299 | if (status) |
300 | printk("NFSD: Failed to remove expired client state directory" | |
301 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
302 | return; | |
303 | } | |
304 | ||
305 | static int | |
306 | purge_old(struct dentry *parent, struct dentry *child) | |
307 | { | |
308 | int status; | |
309 | ||
a1bcecd2 AA |
310 | /* note: we currently use this path only for minorversion 0 */ |
311 | if (nfs4_has_reclaimed_state(child->d_name.name, false)) | |
b37ad28b | 312 | return 0; |
c7b9a459 | 313 | |
2f9092e1 | 314 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
315 | if (status) |
316 | printk("failed to remove client recovery directory %s\n", | |
317 | child->d_name.name); | |
318 | /* Keep trying, success or failure: */ | |
b37ad28b | 319 | return 0; |
c7b9a459 N |
320 | } |
321 | ||
322 | void | |
323 | nfsd4_recdir_purge_old(void) { | |
324 | int status; | |
325 | ||
326 | if (!rec_dir_init) | |
327 | return; | |
a63bb996 | 328 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
329 | if (status) |
330 | goto out; | |
a63bb996 | 331 | status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old); |
c7b9a459 | 332 | if (status == 0) |
a6ccbbb8 | 333 | nfsd4_sync_rec_dir(); |
a63bb996 | 334 | mnt_drop_write(rec_dir.mnt); |
0622753b | 335 | out: |
c7b9a459 N |
336 | if (status) |
337 | printk("nfsd4: failed to purge old clients from recovery" | |
a63bb996 | 338 | " directory %s\n", rec_dir.dentry->d_name.name); |
c7b9a459 N |
339 | } |
340 | ||
190e4fbf N |
341 | static int |
342 | load_recdir(struct dentry *parent, struct dentry *child) | |
343 | { | |
344 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
345 | printk("nfsd4: illegal name %s in recovery directory\n", | |
346 | child->d_name.name); | |
347 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 348 | return 0; |
190e4fbf N |
349 | } |
350 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 351 | return 0; |
190e4fbf N |
352 | } |
353 | ||
354 | int | |
355 | nfsd4_recdir_load(void) { | |
356 | int status; | |
357 | ||
a63bb996 | 358 | status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir); |
190e4fbf N |
359 | if (status) |
360 | printk("nfsd4: failed loading clients from recovery" | |
a63bb996 | 361 | " directory %s\n", rec_dir.dentry->d_name.name); |
190e4fbf N |
362 | return status; |
363 | } | |
364 | ||
365 | /* | |
366 | * Hold reference to the recovery directory. | |
367 | */ | |
368 | ||
369 | void | |
370 | nfsd4_init_recdir(char *rec_dirname) | |
371 | { | |
d84f4f99 DH |
372 | const struct cred *original_cred; |
373 | int status; | |
190e4fbf N |
374 | |
375 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
376 | rec_dirname); | |
377 | ||
378 | BUG_ON(rec_dir_init); | |
379 | ||
d84f4f99 DH |
380 | status = nfs4_save_creds(&original_cred); |
381 | if (status < 0) { | |
382 | printk("NFSD: Unable to change credentials to find recovery" | |
383 | " directory: error %d\n", | |
384 | status); | |
385 | return; | |
386 | } | |
190e4fbf | 387 | |
a63bb996 | 388 | status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, |
c2642ab0 BF |
389 | &rec_dir); |
390 | if (status) | |
391 | printk("NFSD: unable to find recovery directory %s\n", | |
190e4fbf N |
392 | rec_dirname); |
393 | ||
394 | if (!status) | |
395 | rec_dir_init = 1; | |
d84f4f99 | 396 | nfs4_reset_creds(original_cred); |
190e4fbf N |
397 | } |
398 | ||
399 | void | |
400 | nfsd4_shutdown_recdir(void) | |
401 | { | |
402 | if (!rec_dir_init) | |
403 | return; | |
404 | rec_dir_init = 0; | |
a63bb996 | 405 | path_put(&rec_dir); |
190e4fbf | 406 | } |