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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/nfs/idmap.c | |
3 | * | |
4 | * UID and GID to name mapping for clients. | |
5 | * | |
6 | * Copyright (c) 2002 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Marius Aamodt Eriksen <marius@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
5cf36cfd TM |
36 | #include <linux/types.h> |
37 | #include <linux/string.h> | |
38 | #include <linux/kernel.h> | |
e44ba033 VI |
39 | #include <linux/slab.h> |
40 | #include <linux/nfs_idmap.h> | |
5cf36cfd TM |
41 | |
42 | static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) | |
43 | { | |
44 | unsigned long val; | |
45 | char buf[16]; | |
46 | ||
47 | if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) | |
48 | return 0; | |
49 | memcpy(buf, name, namelen); | |
50 | buf[namelen] = '\0'; | |
51 | if (strict_strtoul(buf, 0, &val) != 0) | |
52 | return 0; | |
53 | *res = val; | |
54 | return 1; | |
55 | } | |
1da177e4 | 56 | |
f0b85168 TM |
57 | static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) |
58 | { | |
59 | return snprintf(buf, buflen, "%u", id); | |
60 | } | |
61 | ||
955a857e BS |
62 | #ifdef CONFIG_NFS_USE_NEW_IDMAPPER |
63 | ||
955a857e | 64 | #include <linux/cred.h> |
b064eca2 TM |
65 | #include <linux/sunrpc/sched.h> |
66 | #include <linux/nfs4.h> | |
67 | #include <linux/nfs_fs_sb.h> | |
955a857e BS |
68 | #include <linux/keyctl.h> |
69 | #include <linux/key-type.h> | |
70 | #include <linux/rcupdate.h> | |
955a857e BS |
71 | #include <linux/err.h> |
72 | ||
73 | #include <keys/user-type.h> | |
74 | ||
75 | #define NFS_UINT_MAXLEN 11 | |
76 | ||
77 | const struct cred *id_resolver_cache; | |
78 | ||
79 | struct key_type key_type_id_resolver = { | |
80 | .name = "id_resolver", | |
81 | .instantiate = user_instantiate, | |
82 | .match = user_match, | |
83 | .revoke = user_revoke, | |
84 | .destroy = user_destroy, | |
85 | .describe = user_describe, | |
86 | .read = user_read, | |
87 | }; | |
88 | ||
89 | int nfs_idmap_init(void) | |
90 | { | |
91 | struct cred *cred; | |
92 | struct key *keyring; | |
93 | int ret = 0; | |
94 | ||
95 | printk(KERN_NOTICE "Registering the %s key type\n", key_type_id_resolver.name); | |
96 | ||
97 | cred = prepare_kernel_cred(NULL); | |
98 | if (!cred) | |
99 | return -ENOMEM; | |
100 | ||
101 | keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred, | |
102 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
103 | KEY_USR_VIEW | KEY_USR_READ, | |
104 | KEY_ALLOC_NOT_IN_QUOTA); | |
105 | if (IS_ERR(keyring)) { | |
106 | ret = PTR_ERR(keyring); | |
107 | goto failed_put_cred; | |
108 | } | |
109 | ||
110 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
111 | if (ret < 0) | |
112 | goto failed_put_key; | |
113 | ||
114 | ret = register_key_type(&key_type_id_resolver); | |
115 | if (ret < 0) | |
116 | goto failed_put_key; | |
117 | ||
118 | cred->thread_keyring = keyring; | |
119 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
120 | id_resolver_cache = cred; | |
121 | return 0; | |
122 | ||
123 | failed_put_key: | |
124 | key_put(keyring); | |
125 | failed_put_cred: | |
126 | put_cred(cred); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | void nfs_idmap_quit(void) | |
131 | { | |
132 | key_revoke(id_resolver_cache->thread_keyring); | |
133 | unregister_key_type(&key_type_id_resolver); | |
134 | put_cred(id_resolver_cache); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Assemble the description to pass to request_key() | |
139 | * This function will allocate a new string and update dest to point | |
140 | * at it. The caller is responsible for freeing dest. | |
141 | * | |
142 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
143 | */ | |
144 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
145 | const char *type, size_t typelen, char **desc) | |
146 | { | |
147 | char *cp; | |
148 | size_t desclen = typelen + namelen + 2; | |
149 | ||
150 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 151 | if (!*desc) |
955a857e BS |
152 | return -ENOMEM; |
153 | ||
154 | cp = *desc; | |
155 | memcpy(cp, type, typelen); | |
156 | cp += typelen; | |
157 | *cp++ = ':'; | |
158 | ||
159 | memcpy(cp, name, namelen); | |
160 | cp += namelen; | |
161 | *cp = '\0'; | |
162 | return desclen; | |
163 | } | |
164 | ||
165 | static ssize_t nfs_idmap_request_key(const char *name, size_t namelen, | |
166 | const char *type, void *data, size_t data_size) | |
167 | { | |
168 | const struct cred *saved_cred; | |
169 | struct key *rkey; | |
170 | char *desc; | |
171 | struct user_key_payload *payload; | |
172 | ssize_t ret; | |
173 | ||
174 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
175 | if (ret <= 0) | |
176 | goto out; | |
177 | ||
178 | saved_cred = override_creds(id_resolver_cache); | |
179 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
180 | revert_creds(saved_cred); | |
181 | kfree(desc); | |
182 | if (IS_ERR(rkey)) { | |
183 | ret = PTR_ERR(rkey); | |
184 | goto out; | |
185 | } | |
186 | ||
187 | rcu_read_lock(); | |
188 | rkey->perm |= KEY_USR_VIEW; | |
189 | ||
190 | ret = key_validate(rkey); | |
191 | if (ret < 0) | |
192 | goto out_up; | |
193 | ||
194 | payload = rcu_dereference(rkey->payload.data); | |
195 | if (IS_ERR_OR_NULL(payload)) { | |
196 | ret = PTR_ERR(payload); | |
197 | goto out_up; | |
198 | } | |
199 | ||
200 | ret = payload->datalen; | |
201 | if (ret > 0 && ret <= data_size) | |
202 | memcpy(data, payload->data, ret); | |
203 | else | |
204 | ret = -EINVAL; | |
205 | ||
206 | out_up: | |
207 | rcu_read_unlock(); | |
208 | key_put(rkey); | |
209 | out: | |
210 | return ret; | |
211 | } | |
212 | ||
213 | ||
214 | /* ID -> Name */ | |
215 | static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, size_t buflen) | |
216 | { | |
217 | char id_str[NFS_UINT_MAXLEN]; | |
218 | int id_len; | |
219 | ssize_t ret; | |
220 | ||
221 | id_len = snprintf(id_str, sizeof(id_str), "%u", id); | |
222 | ret = nfs_idmap_request_key(id_str, id_len, type, buf, buflen); | |
223 | if (ret < 0) | |
224 | return -EINVAL; | |
225 | return ret; | |
226 | } | |
227 | ||
228 | /* Name -> ID */ | |
229 | static int nfs_idmap_lookup_id(const char *name, size_t namelen, | |
230 | const char *type, __u32 *id) | |
231 | { | |
232 | char id_str[NFS_UINT_MAXLEN]; | |
233 | long id_long; | |
234 | ssize_t data_size; | |
235 | int ret = 0; | |
236 | ||
237 | data_size = nfs_idmap_request_key(name, namelen, type, id_str, NFS_UINT_MAXLEN); | |
238 | if (data_size <= 0) { | |
239 | ret = -EINVAL; | |
240 | } else { | |
241 | ret = strict_strtol(id_str, 10, &id_long); | |
242 | *id = (__u32)id_long; | |
243 | } | |
244 | return ret; | |
245 | } | |
246 | ||
e4fd72a1 | 247 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
955a857e | 248 | { |
5cf36cfd TM |
249 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
250 | return 0; | |
955a857e BS |
251 | return nfs_idmap_lookup_id(name, namelen, "uid", uid); |
252 | } | |
253 | ||
e4fd72a1 | 254 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) |
955a857e | 255 | { |
5cf36cfd TM |
256 | if (nfs_map_string_to_numeric(name, namelen, gid)) |
257 | return 0; | |
955a857e BS |
258 | return nfs_idmap_lookup_id(name, namelen, "gid", gid); |
259 | } | |
260 | ||
e4fd72a1 | 261 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
955a857e | 262 | { |
b064eca2 TM |
263 | int ret = -EINVAL; |
264 | ||
265 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) | |
266 | ret = nfs_idmap_lookup_name(uid, "user", buf, buflen); | |
f0b85168 TM |
267 | if (ret < 0) |
268 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
269 | return ret; | |
955a857e | 270 | } |
e4fd72a1 | 271 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen) |
955a857e | 272 | { |
b064eca2 | 273 | int ret = -EINVAL; |
f0b85168 | 274 | |
b064eca2 TM |
275 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
276 | ret = nfs_idmap_lookup_name(gid, "group", buf, buflen); | |
f0b85168 TM |
277 | if (ret < 0) |
278 | ret = nfs_map_numeric_to_string(gid, buf, buflen); | |
279 | return ret; | |
955a857e BS |
280 | } |
281 | ||
5f3e97c9 | 282 | #else /* CONFIG_NFS_USE_NEW_IDMAPPER not defined */ |
955a857e | 283 | |
1da177e4 | 284 | #include <linux/module.h> |
c9d5128a | 285 | #include <linux/mutex.h> |
1da177e4 | 286 | #include <linux/init.h> |
1da177e4 LT |
287 | #include <linux/socket.h> |
288 | #include <linux/in.h> | |
289 | #include <linux/sched.h> | |
1da177e4 LT |
290 | #include <linux/sunrpc/clnt.h> |
291 | #include <linux/workqueue.h> | |
292 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
293 | ||
1da177e4 LT |
294 | #include <linux/nfs_fs.h> |
295 | ||
4ce79717 | 296 | #include "nfs4_fs.h" |
1da177e4 LT |
297 | |
298 | #define IDMAP_HASH_SZ 128 | |
299 | ||
58df095b TM |
300 | /* Default cache timeout is 10 minutes */ |
301 | unsigned int nfs_idmap_cache_timeout = 600 * HZ; | |
302 | ||
7d4e2747 DH |
303 | static int param_set_idmap_timeout(const char *val, struct kernel_param *kp) |
304 | { | |
305 | char *endp; | |
306 | int num = simple_strtol(val, &endp, 0); | |
307 | int jif = num * HZ; | |
308 | if (endp == val || *endp || num < 0 || jif < num) | |
309 | return -EINVAL; | |
310 | *((int *)kp->arg) = jif; | |
311 | return 0; | |
312 | } | |
313 | ||
314 | module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int, | |
315 | &nfs_idmap_cache_timeout, 0644); | |
316 | ||
1da177e4 | 317 | struct idmap_hashent { |
369af0f1 CL |
318 | unsigned long ih_expires; |
319 | __u32 ih_id; | |
d24aae41 | 320 | size_t ih_namelen; |
369af0f1 | 321 | char ih_name[IDMAP_NAMESZ]; |
1da177e4 LT |
322 | }; |
323 | ||
324 | struct idmap_hashtable { | |
369af0f1 CL |
325 | __u8 h_type; |
326 | struct idmap_hashent h_entries[IDMAP_HASH_SZ]; | |
1da177e4 LT |
327 | }; |
328 | ||
329 | struct idmap { | |
369af0f1 CL |
330 | struct dentry *idmap_dentry; |
331 | wait_queue_head_t idmap_wq; | |
332 | struct idmap_msg idmap_im; | |
333 | struct mutex idmap_lock; /* Serializes upcalls */ | |
334 | struct mutex idmap_im_lock; /* Protects the hashtable */ | |
335 | struct idmap_hashtable idmap_user_hash; | |
336 | struct idmap_hashtable idmap_group_hash; | |
1da177e4 LT |
337 | }; |
338 | ||
369af0f1 CL |
339 | static ssize_t idmap_pipe_downcall(struct file *, const char __user *, |
340 | size_t); | |
341 | static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); | |
1da177e4 LT |
342 | |
343 | static unsigned int fnvhash32(const void *, size_t); | |
344 | ||
b693ba4a | 345 | static const struct rpc_pipe_ops idmap_upcall_ops = { |
c1225158 | 346 | .upcall = rpc_pipe_generic_upcall, |
369af0f1 CL |
347 | .downcall = idmap_pipe_downcall, |
348 | .destroy_msg = idmap_pipe_destroy_msg, | |
1da177e4 LT |
349 | }; |
350 | ||
b7162792 | 351 | int |
adfa6f98 | 352 | nfs_idmap_new(struct nfs_client *clp) |
1da177e4 LT |
353 | { |
354 | struct idmap *idmap; | |
b7162792 | 355 | int error; |
1da177e4 | 356 | |
54ceac45 | 357 | BUG_ON(clp->cl_idmap != NULL); |
b7162792 | 358 | |
369af0f1 CL |
359 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
360 | if (idmap == NULL) | |
361 | return -ENOMEM; | |
1da177e4 | 362 | |
7d217cac TM |
363 | idmap->idmap_dentry = rpc_mkpipe(clp->cl_rpcclient->cl_path.dentry, |
364 | "idmap", idmap, &idmap_upcall_ops, 0); | |
369af0f1 | 365 | if (IS_ERR(idmap->idmap_dentry)) { |
b7162792 | 366 | error = PTR_ERR(idmap->idmap_dentry); |
1da177e4 | 367 | kfree(idmap); |
b7162792 | 368 | return error; |
1da177e4 LT |
369 | } |
370 | ||
369af0f1 CL |
371 | mutex_init(&idmap->idmap_lock); |
372 | mutex_init(&idmap->idmap_im_lock); | |
1da177e4 LT |
373 | init_waitqueue_head(&idmap->idmap_wq); |
374 | idmap->idmap_user_hash.h_type = IDMAP_TYPE_USER; | |
375 | idmap->idmap_group_hash.h_type = IDMAP_TYPE_GROUP; | |
376 | ||
377 | clp->cl_idmap = idmap; | |
b7162792 | 378 | return 0; |
1da177e4 LT |
379 | } |
380 | ||
381 | void | |
adfa6f98 | 382 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
383 | { |
384 | struct idmap *idmap = clp->cl_idmap; | |
385 | ||
386 | if (!idmap) | |
387 | return; | |
5d67476f | 388 | rpc_unlink(idmap->idmap_dentry); |
1da177e4 LT |
389 | clp->cl_idmap = NULL; |
390 | kfree(idmap); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Helper routines for manipulating the hashtable | |
395 | */ | |
396 | static inline struct idmap_hashent * | |
397 | idmap_name_hash(struct idmap_hashtable* h, const char *name, size_t len) | |
398 | { | |
399 | return &h->h_entries[fnvhash32(name, len) % IDMAP_HASH_SZ]; | |
400 | } | |
401 | ||
402 | static struct idmap_hashent * | |
403 | idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len) | |
404 | { | |
405 | struct idmap_hashent *he = idmap_name_hash(h, name, len); | |
406 | ||
407 | if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0) | |
408 | return NULL; | |
58df095b TM |
409 | if (time_after(jiffies, he->ih_expires)) |
410 | return NULL; | |
1da177e4 LT |
411 | return he; |
412 | } | |
413 | ||
414 | static inline struct idmap_hashent * | |
415 | idmap_id_hash(struct idmap_hashtable* h, __u32 id) | |
416 | { | |
417 | return &h->h_entries[fnvhash32(&id, sizeof(id)) % IDMAP_HASH_SZ]; | |
418 | } | |
419 | ||
420 | static struct idmap_hashent * | |
421 | idmap_lookup_id(struct idmap_hashtable *h, __u32 id) | |
422 | { | |
423 | struct idmap_hashent *he = idmap_id_hash(h, id); | |
424 | if (he->ih_id != id || he->ih_namelen == 0) | |
425 | return NULL; | |
58df095b TM |
426 | if (time_after(jiffies, he->ih_expires)) |
427 | return NULL; | |
1da177e4 LT |
428 | return he; |
429 | } | |
430 | ||
431 | /* | |
432 | * Routines for allocating new entries in the hashtable. | |
433 | * For now, we just have 1 entry per bucket, so it's all | |
434 | * pretty trivial. | |
435 | */ | |
436 | static inline struct idmap_hashent * | |
d24aae41 | 437 | idmap_alloc_name(struct idmap_hashtable *h, char *name, size_t len) |
1da177e4 LT |
438 | { |
439 | return idmap_name_hash(h, name, len); | |
440 | } | |
441 | ||
442 | static inline struct idmap_hashent * | |
443 | idmap_alloc_id(struct idmap_hashtable *h, __u32 id) | |
444 | { | |
445 | return idmap_id_hash(h, id); | |
446 | } | |
447 | ||
448 | static void | |
449 | idmap_update_entry(struct idmap_hashent *he, const char *name, | |
450 | size_t namelen, __u32 id) | |
451 | { | |
452 | he->ih_id = id; | |
453 | memcpy(he->ih_name, name, namelen); | |
454 | he->ih_name[namelen] = '\0'; | |
455 | he->ih_namelen = namelen; | |
58df095b | 456 | he->ih_expires = jiffies + nfs_idmap_cache_timeout; |
1da177e4 LT |
457 | } |
458 | ||
459 | /* | |
460 | * Name -> ID | |
461 | */ | |
462 | static int | |
463 | nfs_idmap_id(struct idmap *idmap, struct idmap_hashtable *h, | |
464 | const char *name, size_t namelen, __u32 *id) | |
465 | { | |
466 | struct rpc_pipe_msg msg; | |
467 | struct idmap_msg *im; | |
468 | struct idmap_hashent *he; | |
469 | DECLARE_WAITQUEUE(wq, current); | |
470 | int ret = -EIO; | |
471 | ||
472 | im = &idmap->idmap_im; | |
473 | ||
474 | /* | |
475 | * String sanity checks | |
476 | * Note that the userland daemon expects NUL terminated strings | |
477 | */ | |
478 | for (;;) { | |
479 | if (namelen == 0) | |
480 | return -EINVAL; | |
481 | if (name[namelen-1] != '\0') | |
482 | break; | |
483 | namelen--; | |
484 | } | |
485 | if (namelen >= IDMAP_NAMESZ) | |
486 | return -EINVAL; | |
487 | ||
c9d5128a IM |
488 | mutex_lock(&idmap->idmap_lock); |
489 | mutex_lock(&idmap->idmap_im_lock); | |
1da177e4 LT |
490 | |
491 | he = idmap_lookup_name(h, name, namelen); | |
492 | if (he != NULL) { | |
493 | *id = he->ih_id; | |
494 | ret = 0; | |
495 | goto out; | |
496 | } | |
497 | ||
498 | memset(im, 0, sizeof(*im)); | |
499 | memcpy(im->im_name, name, namelen); | |
500 | ||
501 | im->im_type = h->h_type; | |
502 | im->im_conv = IDMAP_CONV_NAMETOID; | |
503 | ||
504 | memset(&msg, 0, sizeof(msg)); | |
505 | msg.data = im; | |
506 | msg.len = sizeof(*im); | |
507 | ||
508 | add_wait_queue(&idmap->idmap_wq, &wq); | |
509 | if (rpc_queue_upcall(idmap->idmap_dentry->d_inode, &msg) < 0) { | |
510 | remove_wait_queue(&idmap->idmap_wq, &wq); | |
511 | goto out; | |
512 | } | |
513 | ||
514 | set_current_state(TASK_UNINTERRUPTIBLE); | |
c9d5128a | 515 | mutex_unlock(&idmap->idmap_im_lock); |
1da177e4 | 516 | schedule(); |
fee7f23f | 517 | __set_current_state(TASK_RUNNING); |
1da177e4 | 518 | remove_wait_queue(&idmap->idmap_wq, &wq); |
c9d5128a | 519 | mutex_lock(&idmap->idmap_im_lock); |
1da177e4 LT |
520 | |
521 | if (im->im_status & IDMAP_STATUS_SUCCESS) { | |
522 | *id = im->im_id; | |
523 | ret = 0; | |
524 | } | |
525 | ||
526 | out: | |
527 | memset(im, 0, sizeof(*im)); | |
c9d5128a IM |
528 | mutex_unlock(&idmap->idmap_im_lock); |
529 | mutex_unlock(&idmap->idmap_lock); | |
369af0f1 | 530 | return ret; |
1da177e4 LT |
531 | } |
532 | ||
533 | /* | |
534 | * ID -> Name | |
535 | */ | |
536 | static int | |
537 | nfs_idmap_name(struct idmap *idmap, struct idmap_hashtable *h, | |
538 | __u32 id, char *name) | |
539 | { | |
540 | struct rpc_pipe_msg msg; | |
541 | struct idmap_msg *im; | |
542 | struct idmap_hashent *he; | |
543 | DECLARE_WAITQUEUE(wq, current); | |
544 | int ret = -EIO; | |
545 | unsigned int len; | |
546 | ||
547 | im = &idmap->idmap_im; | |
548 | ||
c9d5128a IM |
549 | mutex_lock(&idmap->idmap_lock); |
550 | mutex_lock(&idmap->idmap_im_lock); | |
1da177e4 LT |
551 | |
552 | he = idmap_lookup_id(h, id); | |
90dc7d27 | 553 | if (he) { |
1da177e4 LT |
554 | memcpy(name, he->ih_name, he->ih_namelen); |
555 | ret = he->ih_namelen; | |
556 | goto out; | |
557 | } | |
558 | ||
559 | memset(im, 0, sizeof(*im)); | |
560 | im->im_type = h->h_type; | |
561 | im->im_conv = IDMAP_CONV_IDTONAME; | |
562 | im->im_id = id; | |
563 | ||
564 | memset(&msg, 0, sizeof(msg)); | |
565 | msg.data = im; | |
566 | msg.len = sizeof(*im); | |
567 | ||
568 | add_wait_queue(&idmap->idmap_wq, &wq); | |
569 | ||
570 | if (rpc_queue_upcall(idmap->idmap_dentry->d_inode, &msg) < 0) { | |
571 | remove_wait_queue(&idmap->idmap_wq, &wq); | |
572 | goto out; | |
573 | } | |
574 | ||
575 | set_current_state(TASK_UNINTERRUPTIBLE); | |
c9d5128a | 576 | mutex_unlock(&idmap->idmap_im_lock); |
1da177e4 | 577 | schedule(); |
fee7f23f | 578 | __set_current_state(TASK_RUNNING); |
1da177e4 | 579 | remove_wait_queue(&idmap->idmap_wq, &wq); |
c9d5128a | 580 | mutex_lock(&idmap->idmap_im_lock); |
1da177e4 LT |
581 | |
582 | if (im->im_status & IDMAP_STATUS_SUCCESS) { | |
583 | if ((len = strnlen(im->im_name, IDMAP_NAMESZ)) == 0) | |
584 | goto out; | |
585 | memcpy(name, im->im_name, len); | |
586 | ret = len; | |
587 | } | |
588 | ||
589 | out: | |
590 | memset(im, 0, sizeof(*im)); | |
c9d5128a IM |
591 | mutex_unlock(&idmap->idmap_im_lock); |
592 | mutex_unlock(&idmap->idmap_lock); | |
1da177e4 LT |
593 | return ret; |
594 | } | |
595 | ||
1da177e4 LT |
596 | static ssize_t |
597 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
598 | { | |
369af0f1 | 599 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
600 | struct idmap *idmap = (struct idmap *)rpci->private; |
601 | struct idmap_msg im_in, *im = &idmap->idmap_im; | |
602 | struct idmap_hashtable *h; | |
603 | struct idmap_hashent *he = NULL; | |
d24aae41 | 604 | size_t namelen_in; |
1da177e4 LT |
605 | int ret; |
606 | ||
369af0f1 CL |
607 | if (mlen != sizeof(im_in)) |
608 | return -ENOSPC; | |
1da177e4 | 609 | |
369af0f1 CL |
610 | if (copy_from_user(&im_in, src, mlen) != 0) |
611 | return -EFAULT; | |
1da177e4 | 612 | |
c9d5128a | 613 | mutex_lock(&idmap->idmap_im_lock); |
1da177e4 LT |
614 | |
615 | ret = mlen; | |
616 | im->im_status = im_in.im_status; | |
617 | /* If we got an error, terminate now, and wake up pending upcalls */ | |
618 | if (!(im_in.im_status & IDMAP_STATUS_SUCCESS)) { | |
619 | wake_up(&idmap->idmap_wq); | |
620 | goto out; | |
621 | } | |
622 | ||
623 | /* Sanity checking of strings */ | |
624 | ret = -EINVAL; | |
625 | namelen_in = strnlen(im_in.im_name, IDMAP_NAMESZ); | |
626 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) | |
627 | goto out; | |
628 | ||
629 | switch (im_in.im_type) { | |
630 | case IDMAP_TYPE_USER: | |
631 | h = &idmap->idmap_user_hash; | |
632 | break; | |
633 | case IDMAP_TYPE_GROUP: | |
634 | h = &idmap->idmap_group_hash; | |
635 | break; | |
636 | default: | |
637 | goto out; | |
638 | } | |
639 | ||
640 | switch (im_in.im_conv) { | |
641 | case IDMAP_CONV_IDTONAME: | |
642 | /* Did we match the current upcall? */ | |
643 | if (im->im_conv == IDMAP_CONV_IDTONAME | |
644 | && im->im_type == im_in.im_type | |
645 | && im->im_id == im_in.im_id) { | |
646 | /* Yes: copy string, including the terminating '\0' */ | |
647 | memcpy(im->im_name, im_in.im_name, namelen_in); | |
648 | im->im_name[namelen_in] = '\0'; | |
649 | wake_up(&idmap->idmap_wq); | |
650 | } | |
651 | he = idmap_alloc_id(h, im_in.im_id); | |
652 | break; | |
653 | case IDMAP_CONV_NAMETOID: | |
654 | /* Did we match the current upcall? */ | |
655 | if (im->im_conv == IDMAP_CONV_NAMETOID | |
656 | && im->im_type == im_in.im_type | |
657 | && strnlen(im->im_name, IDMAP_NAMESZ) == namelen_in | |
658 | && memcmp(im->im_name, im_in.im_name, namelen_in) == 0) { | |
659 | im->im_id = im_in.im_id; | |
660 | wake_up(&idmap->idmap_wq); | |
661 | } | |
662 | he = idmap_alloc_name(h, im_in.im_name, namelen_in); | |
663 | break; | |
664 | default: | |
665 | goto out; | |
666 | } | |
667 | ||
668 | /* If the entry is valid, also copy it to the cache */ | |
669 | if (he != NULL) | |
670 | idmap_update_entry(he, im_in.im_name, namelen_in, im_in.im_id); | |
671 | ret = mlen; | |
672 | out: | |
c9d5128a | 673 | mutex_unlock(&idmap->idmap_im_lock); |
1da177e4 LT |
674 | return ret; |
675 | } | |
676 | ||
75c96f85 | 677 | static void |
1da177e4 LT |
678 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
679 | { | |
680 | struct idmap_msg *im = msg->data; | |
681 | struct idmap *idmap = container_of(im, struct idmap, idmap_im); | |
682 | ||
683 | if (msg->errno >= 0) | |
684 | return; | |
c9d5128a | 685 | mutex_lock(&idmap->idmap_im_lock); |
1da177e4 LT |
686 | im->im_status = IDMAP_STATUS_LOOKUPFAIL; |
687 | wake_up(&idmap->idmap_wq); | |
c9d5128a | 688 | mutex_unlock(&idmap->idmap_im_lock); |
1da177e4 LT |
689 | } |
690 | ||
691 | /* | |
692 | * Fowler/Noll/Vo hash | |
693 | * http://www.isthe.com/chongo/tech/comp/fnv/ | |
694 | */ | |
695 | ||
696 | #define FNV_P_32 ((unsigned int)0x01000193) /* 16777619 */ | |
697 | #define FNV_1_32 ((unsigned int)0x811c9dc5) /* 2166136261 */ | |
698 | ||
699 | static unsigned int fnvhash32(const void *buf, size_t buflen) | |
700 | { | |
701 | const unsigned char *p, *end = (const unsigned char *)buf + buflen; | |
702 | unsigned int hash = FNV_1_32; | |
703 | ||
704 | for (p = buf; p < end; p++) { | |
705 | hash *= FNV_P_32; | |
706 | hash ^= (unsigned int)*p; | |
707 | } | |
708 | ||
369af0f1 | 709 | return hash; |
1da177e4 LT |
710 | } |
711 | ||
e4fd72a1 | 712 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 713 | { |
e4fd72a1 | 714 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 715 | |
5cf36cfd TM |
716 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
717 | return 0; | |
1da177e4 LT |
718 | return nfs_idmap_id(idmap, &idmap->idmap_user_hash, name, namelen, uid); |
719 | } | |
720 | ||
e4fd72a1 | 721 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 722 | { |
e4fd72a1 | 723 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 724 | |
5cf36cfd TM |
725 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
726 | return 0; | |
1da177e4 LT |
727 | return nfs_idmap_id(idmap, &idmap->idmap_group_hash, name, namelen, uid); |
728 | } | |
729 | ||
e4fd72a1 | 730 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 731 | { |
e4fd72a1 | 732 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 733 | int ret = -EINVAL; |
1da177e4 | 734 | |
b064eca2 TM |
735 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
736 | ret = nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf); | |
f0b85168 TM |
737 | if (ret < 0) |
738 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
739 | return ret; | |
1da177e4 | 740 | } |
e4fd72a1 | 741 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 742 | { |
e4fd72a1 | 743 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 744 | int ret = -EINVAL; |
1da177e4 | 745 | |
b064eca2 TM |
746 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
747 | ret = nfs_idmap_name(idmap, &idmap->idmap_group_hash, uid, buf); | |
f0b85168 TM |
748 | if (ret < 0) |
749 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
750 | return ret; | |
1da177e4 LT |
751 | } |
752 | ||
955a857e | 753 | #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */ |