Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/nfsd/nfs4idmap.c | |
3 | * | |
4 | * Mapping of UID/GIDs to name and vice versa. | |
5 | * | |
6 | * Copyright (c) 2002, 2003 The Regents of the University of | |
7 | * Michigan. 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 | */ | |
36 | ||
1da177e4 LT |
37 | #include <linux/module.h> |
38 | #include <linux/init.h> | |
39 | ||
40 | #include <linux/mm.h> | |
41 | #include <linux/utsname.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/sunrpc/clnt.h> | |
45 | #include <linux/nfs.h> | |
46 | #include <linux/nfs4.h> | |
47 | #include <linux/nfs_fs.h> | |
48 | #include <linux/nfs_page.h> | |
1da177e4 LT |
49 | #include <linux/sunrpc/cache.h> |
50 | #include <linux/nfsd_idmap.h> | |
51 | #include <linux/list.h> | |
1da177e4 LT |
52 | #include <linux/time.h> |
53 | #include <linux/seq_file.h> | |
54 | #include <linux/sunrpc/svcauth.h> | |
55 | ||
56 | /* | |
57 | * Cache entry | |
58 | */ | |
59 | ||
60 | /* | |
61 | * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on | |
62 | * that. | |
63 | */ | |
64 | ||
65 | #define IDMAP_TYPE_USER 0 | |
66 | #define IDMAP_TYPE_GROUP 1 | |
67 | ||
68 | struct ent { | |
69 | struct cache_head h; | |
70 | int type; /* User / Group */ | |
71 | uid_t id; | |
72 | char name[IDMAP_NAMESZ]; | |
73 | char authname[IDMAP_NAMESZ]; | |
74 | }; | |
75 | ||
1da177e4 LT |
76 | /* Common entry handling */ |
77 | ||
78 | #define ENT_HASHBITS 8 | |
79 | #define ENT_HASHMAX (1 << ENT_HASHBITS) | |
80 | #define ENT_HASHMASK (ENT_HASHMAX - 1) | |
81 | ||
f9ecc921 N |
82 | static void |
83 | ent_init(struct cache_head *cnew, struct cache_head *citm) | |
1da177e4 | 84 | { |
f9ecc921 N |
85 | struct ent *new = container_of(cnew, struct ent, h); |
86 | struct ent *itm = container_of(citm, struct ent, h); | |
87 | ||
1da177e4 LT |
88 | new->id = itm->id; |
89 | new->type = itm->type; | |
90 | ||
91 | strlcpy(new->name, itm->name, sizeof(new->name)); | |
92 | strlcpy(new->authname, itm->authname, sizeof(new->name)); | |
93 | } | |
94 | ||
fd39ca9a | 95 | static void |
baab935f | 96 | ent_put(struct kref *ref) |
1da177e4 | 97 | { |
baab935f N |
98 | struct ent *map = container_of(ref, struct ent, h.ref); |
99 | kfree(map); | |
1da177e4 LT |
100 | } |
101 | ||
f9ecc921 N |
102 | static struct cache_head * |
103 | ent_alloc(void) | |
104 | { | |
105 | struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); | |
106 | if (e) | |
107 | return &e->h; | |
108 | else | |
109 | return NULL; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * ID -> Name cache | |
114 | */ | |
115 | ||
116 | static struct cache_head *idtoname_table[ENT_HASHMAX]; | |
117 | ||
118 | static uint32_t | |
119 | idtoname_hash(struct ent *ent) | |
120 | { | |
121 | uint32_t hash; | |
122 | ||
123 | hash = hash_str(ent->authname, ENT_HASHBITS); | |
124 | hash = hash_long(hash ^ ent->id, ENT_HASHBITS); | |
125 | ||
126 | /* Flip LSB for user/group */ | |
127 | if (ent->type == IDMAP_TYPE_GROUP) | |
128 | hash ^= 1; | |
129 | ||
130 | return hash; | |
131 | } | |
132 | ||
133 | static void | |
134 | idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, | |
135 | int *blen) | |
136 | { | |
137 | struct ent *ent = container_of(ch, struct ent, h); | |
138 | char idstr[11]; | |
139 | ||
140 | qword_add(bpp, blen, ent->authname); | |
0a725fc4 | 141 | snprintf(idstr, sizeof(idstr), "%u", ent->id); |
1da177e4 LT |
142 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
143 | qword_add(bpp, blen, idstr); | |
144 | ||
145 | (*bpp)[-1] = '\n'; | |
146 | } | |
147 | ||
f9ecc921 N |
148 | static int |
149 | idtoname_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 150 | { |
f9ecc921 N |
151 | struct ent *a = container_of(ca, struct ent, h); |
152 | struct ent *b = container_of(cb, struct ent, h); | |
153 | ||
1da177e4 LT |
154 | return (a->id == b->id && a->type == b->type && |
155 | strcmp(a->authname, b->authname) == 0); | |
156 | } | |
157 | ||
158 | static int | |
159 | idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
160 | { | |
161 | struct ent *ent; | |
162 | ||
163 | if (h == NULL) { | |
164 | seq_puts(m, "#domain type id [name]\n"); | |
165 | return 0; | |
166 | } | |
167 | ent = container_of(h, struct ent, h); | |
0a725fc4 | 168 | seq_printf(m, "%s %s %u", ent->authname, |
1da177e4 LT |
169 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
170 | ent->id); | |
171 | if (test_bit(CACHE_VALID, &h->flags)) | |
172 | seq_printf(m, " %s", ent->name); | |
173 | seq_printf(m, "\n"); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static void | |
178 | warn_no_idmapd(struct cache_detail *detail) | |
179 | { | |
180 | printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", | |
181 | detail->last_close? "died" : "not been started"); | |
182 | } | |
183 | ||
184 | ||
185 | static int idtoname_parse(struct cache_detail *, char *, int); | |
f9ecc921 N |
186 | static struct ent *idtoname_lookup(struct ent *); |
187 | static struct ent *idtoname_update(struct ent *, struct ent *); | |
1da177e4 | 188 | |
fd39ca9a | 189 | static struct cache_detail idtoname_cache = { |
f35279d3 | 190 | .owner = THIS_MODULE, |
1da177e4 LT |
191 | .hash_size = ENT_HASHMAX, |
192 | .hash_table = idtoname_table, | |
193 | .name = "nfs4.idtoname", | |
194 | .cache_put = ent_put, | |
195 | .cache_request = idtoname_request, | |
196 | .cache_parse = idtoname_parse, | |
197 | .cache_show = idtoname_show, | |
198 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
199 | .match = idtoname_match, |
200 | .init = ent_init, | |
201 | .update = ent_init, | |
202 | .alloc = ent_alloc, | |
1da177e4 LT |
203 | }; |
204 | ||
a254b246 | 205 | static int |
1da177e4 LT |
206 | idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
207 | { | |
208 | struct ent ent, *res; | |
209 | char *buf1, *bp; | |
c9b6cbe5 | 210 | int len; |
1da177e4 LT |
211 | int error = -EINVAL; |
212 | ||
213 | if (buf[buflen - 1] != '\n') | |
214 | return (-EINVAL); | |
215 | buf[buflen - 1]= '\0'; | |
216 | ||
217 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
218 | if (buf1 == NULL) | |
219 | return (-ENOMEM); | |
220 | ||
221 | memset(&ent, 0, sizeof(ent)); | |
222 | ||
223 | /* Authentication name */ | |
224 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
225 | goto out; | |
226 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
227 | ||
228 | /* Type */ | |
229 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
230 | goto out; | |
231 | ent.type = strcmp(buf1, "user") == 0 ? | |
232 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
233 | ||
234 | /* ID */ | |
235 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
236 | goto out; | |
237 | ent.id = simple_strtoul(buf1, &bp, 10); | |
238 | if (bp == buf1) | |
239 | goto out; | |
240 | ||
241 | /* expiry */ | |
242 | ent.h.expiry_time = get_expiry(&buf); | |
243 | if (ent.h.expiry_time == 0) | |
244 | goto out; | |
245 | ||
f9ecc921 N |
246 | error = -ENOMEM; |
247 | res = idtoname_lookup(&ent); | |
248 | if (!res) | |
249 | goto out; | |
250 | ||
1da177e4 | 251 | /* Name */ |
c9b6cbe5 BF |
252 | error = -EINVAL; |
253 | len = qword_get(&buf, buf1, PAGE_SIZE); | |
254 | if (len < 0) | |
1da177e4 | 255 | goto out; |
c9b6cbe5 | 256 | if (len == 0) |
1da177e4 | 257 | set_bit(CACHE_NEGATIVE, &ent.h.flags); |
d4395e03 BF |
258 | else if (len >= IDMAP_NAMESZ) |
259 | goto out; | |
260 | else | |
1da177e4 | 261 | memcpy(ent.name, buf1, sizeof(ent.name)); |
1da177e4 | 262 | error = -ENOMEM; |
f9ecc921 N |
263 | res = idtoname_update(&ent, res); |
264 | if (res == NULL) | |
1da177e4 LT |
265 | goto out; |
266 | ||
baab935f | 267 | cache_put(&res->h, &idtoname_cache); |
1da177e4 LT |
268 | |
269 | error = 0; | |
270 | out: | |
271 | kfree(buf1); | |
272 | ||
273 | return error; | |
274 | } | |
275 | ||
f9ecc921 N |
276 | |
277 | static struct ent * | |
278 | idtoname_lookup(struct ent *item) | |
279 | { | |
280 | struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache, | |
281 | &item->h, | |
282 | idtoname_hash(item)); | |
283 | if (ch) | |
284 | return container_of(ch, struct ent, h); | |
285 | else | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | static struct ent * | |
290 | idtoname_update(struct ent *new, struct ent *old) | |
291 | { | |
292 | struct cache_head *ch = sunrpc_cache_update(&idtoname_cache, | |
293 | &new->h, &old->h, | |
294 | idtoname_hash(new)); | |
295 | if (ch) | |
296 | return container_of(ch, struct ent, h); | |
297 | else | |
298 | return NULL; | |
299 | } | |
300 | ||
1da177e4 LT |
301 | |
302 | /* | |
303 | * Name -> ID cache | |
304 | */ | |
305 | ||
306 | static struct cache_head *nametoid_table[ENT_HASHMAX]; | |
307 | ||
308 | static inline int | |
309 | nametoid_hash(struct ent *ent) | |
310 | { | |
311 | return hash_str(ent->name, ENT_HASHBITS); | |
312 | } | |
313 | ||
fd39ca9a | 314 | static void |
1da177e4 LT |
315 | nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
316 | int *blen) | |
317 | { | |
318 | struct ent *ent = container_of(ch, struct ent, h); | |
319 | ||
320 | qword_add(bpp, blen, ent->authname); | |
321 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); | |
322 | qword_add(bpp, blen, ent->name); | |
323 | ||
324 | (*bpp)[-1] = '\n'; | |
325 | } | |
326 | ||
f9ecc921 N |
327 | static int |
328 | nametoid_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 329 | { |
f9ecc921 N |
330 | struct ent *a = container_of(ca, struct ent, h); |
331 | struct ent *b = container_of(cb, struct ent, h); | |
332 | ||
1da177e4 LT |
333 | return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
334 | strcmp(a->authname, b->authname) == 0); | |
335 | } | |
336 | ||
337 | static int | |
338 | nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
339 | { | |
340 | struct ent *ent; | |
341 | ||
342 | if (h == NULL) { | |
343 | seq_puts(m, "#domain type name [id]\n"); | |
344 | return 0; | |
345 | } | |
346 | ent = container_of(h, struct ent, h); | |
347 | seq_printf(m, "%s %s %s", ent->authname, | |
348 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", | |
349 | ent->name); | |
350 | if (test_bit(CACHE_VALID, &h->flags)) | |
0a725fc4 | 351 | seq_printf(m, " %u", ent->id); |
1da177e4 LT |
352 | seq_printf(m, "\n"); |
353 | return 0; | |
354 | } | |
355 | ||
f9ecc921 N |
356 | static struct ent *nametoid_lookup(struct ent *); |
357 | static struct ent *nametoid_update(struct ent *, struct ent *); | |
fd39ca9a | 358 | static int nametoid_parse(struct cache_detail *, char *, int); |
1da177e4 | 359 | |
fd39ca9a | 360 | static struct cache_detail nametoid_cache = { |
f35279d3 | 361 | .owner = THIS_MODULE, |
1da177e4 LT |
362 | .hash_size = ENT_HASHMAX, |
363 | .hash_table = nametoid_table, | |
364 | .name = "nfs4.nametoid", | |
365 | .cache_put = ent_put, | |
366 | .cache_request = nametoid_request, | |
367 | .cache_parse = nametoid_parse, | |
368 | .cache_show = nametoid_show, | |
369 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
370 | .match = nametoid_match, |
371 | .init = ent_init, | |
372 | .update = ent_init, | |
373 | .alloc = ent_alloc, | |
1da177e4 LT |
374 | }; |
375 | ||
fd39ca9a | 376 | static int |
1da177e4 LT |
377 | nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
378 | { | |
379 | struct ent ent, *res; | |
380 | char *buf1; | |
381 | int error = -EINVAL; | |
382 | ||
383 | if (buf[buflen - 1] != '\n') | |
384 | return (-EINVAL); | |
385 | buf[buflen - 1]= '\0'; | |
386 | ||
387 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
388 | if (buf1 == NULL) | |
389 | return (-ENOMEM); | |
390 | ||
391 | memset(&ent, 0, sizeof(ent)); | |
392 | ||
393 | /* Authentication name */ | |
394 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
395 | goto out; | |
396 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
397 | ||
398 | /* Type */ | |
399 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
400 | goto out; | |
401 | ent.type = strcmp(buf1, "user") == 0 ? | |
402 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
403 | ||
404 | /* Name */ | |
405 | error = qword_get(&buf, buf1, PAGE_SIZE); | |
406 | if (error <= 0 || error >= IDMAP_NAMESZ) | |
407 | goto out; | |
408 | memcpy(ent.name, buf1, sizeof(ent.name)); | |
409 | ||
410 | /* expiry */ | |
411 | ent.h.expiry_time = get_expiry(&buf); | |
412 | if (ent.h.expiry_time == 0) | |
413 | goto out; | |
414 | ||
415 | /* ID */ | |
416 | error = get_int(&buf, &ent.id); | |
417 | if (error == -EINVAL) | |
418 | goto out; | |
419 | if (error == -ENOENT) | |
420 | set_bit(CACHE_NEGATIVE, &ent.h.flags); | |
421 | ||
422 | error = -ENOMEM; | |
f9ecc921 N |
423 | res = nametoid_lookup(&ent); |
424 | if (res == NULL) | |
425 | goto out; | |
426 | res = nametoid_update(&ent, res); | |
427 | if (res == NULL) | |
1da177e4 LT |
428 | goto out; |
429 | ||
baab935f | 430 | cache_put(&res->h, &nametoid_cache); |
1da177e4 LT |
431 | error = 0; |
432 | out: | |
433 | kfree(buf1); | |
434 | ||
435 | return (error); | |
436 | } | |
437 | ||
f9ecc921 N |
438 | |
439 | static struct ent * | |
440 | nametoid_lookup(struct ent *item) | |
441 | { | |
442 | struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache, | |
443 | &item->h, | |
444 | nametoid_hash(item)); | |
445 | if (ch) | |
446 | return container_of(ch, struct ent, h); | |
447 | else | |
448 | return NULL; | |
449 | } | |
450 | ||
451 | static struct ent * | |
452 | nametoid_update(struct ent *new, struct ent *old) | |
453 | { | |
454 | struct cache_head *ch = sunrpc_cache_update(&nametoid_cache, | |
455 | &new->h, &old->h, | |
456 | nametoid_hash(new)); | |
457 | if (ch) | |
458 | return container_of(ch, struct ent, h); | |
459 | else | |
460 | return NULL; | |
461 | } | |
1da177e4 LT |
462 | |
463 | /* | |
464 | * Exported API | |
465 | */ | |
466 | ||
dbf847ec | 467 | int |
1da177e4 LT |
468 | nfsd_idmap_init(void) |
469 | { | |
dbf847ec BF |
470 | int rv; |
471 | ||
472 | rv = cache_register(&idtoname_cache); | |
473 | if (rv) | |
474 | return rv; | |
475 | rv = cache_register(&nametoid_cache); | |
476 | if (rv) | |
477 | cache_unregister(&idtoname_cache); | |
478 | return rv; | |
1da177e4 LT |
479 | } |
480 | ||
481 | void | |
482 | nfsd_idmap_shutdown(void) | |
483 | { | |
df95a9d4 BF |
484 | cache_unregister(&idtoname_cache); |
485 | cache_unregister(&nametoid_cache); | |
1da177e4 LT |
486 | } |
487 | ||
488 | /* | |
489 | * Deferred request handling | |
490 | */ | |
491 | ||
492 | struct idmap_defer_req { | |
493 | struct cache_req req; | |
494 | struct cache_deferred_req deferred_req; | |
495 | wait_queue_head_t waitq; | |
496 | atomic_t count; | |
497 | }; | |
498 | ||
499 | static inline void | |
500 | put_mdr(struct idmap_defer_req *mdr) | |
501 | { | |
502 | if (atomic_dec_and_test(&mdr->count)) | |
503 | kfree(mdr); | |
504 | } | |
505 | ||
506 | static inline void | |
507 | get_mdr(struct idmap_defer_req *mdr) | |
508 | { | |
509 | atomic_inc(&mdr->count); | |
510 | } | |
511 | ||
512 | static void | |
513 | idmap_revisit(struct cache_deferred_req *dreq, int toomany) | |
514 | { | |
515 | struct idmap_defer_req *mdr = | |
516 | container_of(dreq, struct idmap_defer_req, deferred_req); | |
517 | ||
518 | wake_up(&mdr->waitq); | |
519 | put_mdr(mdr); | |
520 | } | |
521 | ||
522 | static struct cache_deferred_req * | |
523 | idmap_defer(struct cache_req *req) | |
524 | { | |
525 | struct idmap_defer_req *mdr = | |
526 | container_of(req, struct idmap_defer_req, req); | |
527 | ||
528 | mdr->deferred_req.revisit = idmap_revisit; | |
529 | get_mdr(mdr); | |
530 | return (&mdr->deferred_req); | |
531 | } | |
532 | ||
533 | static inline int | |
f9ecc921 | 534 | do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
535 | struct cache_detail *detail, struct ent **item, |
536 | struct idmap_defer_req *mdr) | |
537 | { | |
f9ecc921 | 538 | *item = lookup_fn(key); |
1da177e4 LT |
539 | if (!*item) |
540 | return -ENOMEM; | |
541 | return cache_check(detail, &(*item)->h, &mdr->req); | |
542 | } | |
543 | ||
544 | static inline int | |
f9ecc921 | 545 | do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *), |
1da177e4 LT |
546 | struct ent *key, struct cache_detail *detail, |
547 | struct ent **item) | |
548 | { | |
549 | int ret = -ENOMEM; | |
550 | ||
f9ecc921 | 551 | *item = lookup_fn(key); |
1da177e4 LT |
552 | if (!*item) |
553 | goto out_err; | |
554 | ret = -ETIMEDOUT; | |
555 | if (!test_bit(CACHE_VALID, &(*item)->h.flags) | |
556 | || (*item)->h.expiry_time < get_seconds() | |
557 | || detail->flush_time > (*item)->h.last_refresh) | |
558 | goto out_put; | |
559 | ret = -ENOENT; | |
560 | if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags)) | |
561 | goto out_put; | |
562 | return 0; | |
563 | out_put: | |
baab935f | 564 | cache_put(&(*item)->h, detail); |
1da177e4 LT |
565 | out_err: |
566 | *item = NULL; | |
567 | return ret; | |
568 | } | |
569 | ||
570 | static int | |
571 | idmap_lookup(struct svc_rqst *rqstp, | |
f9ecc921 | 572 | struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
573 | struct cache_detail *detail, struct ent **item) |
574 | { | |
575 | struct idmap_defer_req *mdr; | |
576 | int ret; | |
577 | ||
f8314dc6 | 578 | mdr = kzalloc(sizeof(*mdr), GFP_KERNEL); |
1da177e4 LT |
579 | if (!mdr) |
580 | return -ENOMEM; | |
1da177e4 LT |
581 | atomic_set(&mdr->count, 1); |
582 | init_waitqueue_head(&mdr->waitq); | |
583 | mdr->req.defer = idmap_defer; | |
584 | ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr); | |
585 | if (ret == -EAGAIN) { | |
586 | wait_event_interruptible_timeout(mdr->waitq, | |
587 | test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ); | |
588 | ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item); | |
589 | } | |
590 | put_mdr(mdr); | |
591 | return ret; | |
592 | } | |
593 | ||
3ab4d8b1 BF |
594 | static char * |
595 | rqst_authname(struct svc_rqst *rqstp) | |
596 | { | |
597 | struct auth_domain *clp; | |
598 | ||
599 | clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client; | |
600 | return clp->name; | |
601 | } | |
602 | ||
1da177e4 LT |
603 | static int |
604 | idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, | |
605 | uid_t *id) | |
606 | { | |
607 | struct ent *item, key = { | |
608 | .type = type, | |
609 | }; | |
610 | int ret; | |
611 | ||
612 | if (namelen + 1 > sizeof(key.name)) | |
613 | return -EINVAL; | |
614 | memcpy(key.name, name, namelen); | |
615 | key.name[namelen] = '\0'; | |
3ab4d8b1 | 616 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
1da177e4 LT |
617 | ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item); |
618 | if (ret == -ENOENT) | |
619 | ret = -ESRCH; /* nfserr_badname */ | |
620 | if (ret) | |
621 | return ret; | |
622 | *id = item->id; | |
baab935f | 623 | cache_put(&item->h, &nametoid_cache); |
1da177e4 LT |
624 | return 0; |
625 | } | |
626 | ||
627 | static int | |
628 | idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name) | |
629 | { | |
630 | struct ent *item, key = { | |
631 | .id = id, | |
632 | .type = type, | |
633 | }; | |
634 | int ret; | |
635 | ||
3ab4d8b1 | 636 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
1da177e4 LT |
637 | ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item); |
638 | if (ret == -ENOENT) | |
639 | return sprintf(name, "%u", id); | |
640 | if (ret) | |
641 | return ret; | |
642 | ret = strlen(item->name); | |
643 | BUG_ON(ret > IDMAP_NAMESZ); | |
644 | memcpy(name, item->name, ret); | |
baab935f | 645 | cache_put(&item->h, &idtoname_cache); |
1da177e4 LT |
646 | return ret; |
647 | } | |
648 | ||
649 | int | |
650 | nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
651 | __u32 *id) | |
652 | { | |
653 | return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id); | |
654 | } | |
655 | ||
656 | int | |
657 | nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
658 | __u32 *id) | |
659 | { | |
660 | return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id); | |
661 | } | |
662 | ||
663 | int | |
664 | nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
665 | { | |
666 | return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); | |
667 | } | |
668 | ||
669 | int | |
670 | nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
671 | { | |
672 | return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); | |
673 | } |