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[people/ms/linux.git] / fs / nfs / nfs4idmap.c
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 */
36 #include <linux/types.h>
37 #include <linux/parser.h>
38 #include <linux/fs.h>
39 #include <net/net_namespace.h>
40 #include <linux/sunrpc/rpc_pipe_fs.h>
41 #include <linux/nfs_fs.h>
42 #include <linux/nfs_fs_sb.h>
43 #include <linux/key.h>
44 #include <linux/keyctl.h>
45 #include <linux/key-type.h>
46 #include <keys/user-type.h>
47 #include <linux/module.h>
48
49 #include "internal.h"
50 #include "netns.h"
51 #include "nfs4idmap.h"
52 #include "nfs4trace.h"
53
54 #define NFS_UINT_MAXLEN 11
55
56 static const struct cred *id_resolver_cache;
57 static struct key_type key_type_id_resolver_legacy;
58
59 struct idmap_legacy_upcalldata {
60 struct rpc_pipe_msg pipe_msg;
61 struct idmap_msg idmap_msg;
62 struct key_construction *key_cons;
63 struct idmap *idmap;
64 };
65
66 struct idmap {
67 struct rpc_pipe_dir_object idmap_pdo;
68 struct rpc_pipe *idmap_pipe;
69 struct idmap_legacy_upcalldata *idmap_upcall_data;
70 struct mutex idmap_mutex;
71 };
72
73 /**
74 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
75 * @fattr: fully initialised struct nfs_fattr
76 * @owner_name: owner name string cache
77 * @group_name: group name string cache
78 */
79 void nfs_fattr_init_names(struct nfs_fattr *fattr,
80 struct nfs4_string *owner_name,
81 struct nfs4_string *group_name)
82 {
83 fattr->owner_name = owner_name;
84 fattr->group_name = group_name;
85 }
86
87 static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
88 {
89 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
90 kfree(fattr->owner_name->data);
91 }
92
93 static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
94 {
95 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
96 kfree(fattr->group_name->data);
97 }
98
99 static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
100 {
101 struct nfs4_string *owner = fattr->owner_name;
102 kuid_t uid;
103
104 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
105 return false;
106 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
107 fattr->uid = uid;
108 fattr->valid |= NFS_ATTR_FATTR_OWNER;
109 }
110 return true;
111 }
112
113 static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
114 {
115 struct nfs4_string *group = fattr->group_name;
116 kgid_t gid;
117
118 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
119 return false;
120 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
121 fattr->gid = gid;
122 fattr->valid |= NFS_ATTR_FATTR_GROUP;
123 }
124 return true;
125 }
126
127 /**
128 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
129 * @fattr: a fully initialised nfs_fattr structure
130 */
131 void nfs_fattr_free_names(struct nfs_fattr *fattr)
132 {
133 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
134 nfs_fattr_free_owner_name(fattr);
135 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
136 nfs_fattr_free_group_name(fattr);
137 }
138
139 /**
140 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
141 * @server: pointer to the filesystem nfs_server structure
142 * @fattr: a fully initialised nfs_fattr structure
143 *
144 * This helper maps the cached NFSv4 owner/group strings in fattr into
145 * their numeric uid/gid equivalents, and then frees the cached strings.
146 */
147 void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
148 {
149 if (nfs_fattr_map_owner_name(server, fattr))
150 nfs_fattr_free_owner_name(fattr);
151 if (nfs_fattr_map_group_name(server, fattr))
152 nfs_fattr_free_group_name(fattr);
153 }
154
155 int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
156 {
157 unsigned long val;
158 char buf[16];
159
160 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
161 return 0;
162 memcpy(buf, name, namelen);
163 buf[namelen] = '\0';
164 if (kstrtoul(buf, 0, &val) != 0)
165 return 0;
166 *res = val;
167 return 1;
168 }
169 EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric);
170
171 static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
172 {
173 return snprintf(buf, buflen, "%u", id);
174 }
175
176 static struct key_type key_type_id_resolver = {
177 .name = "id_resolver",
178 .preparse = user_preparse,
179 .free_preparse = user_free_preparse,
180 .instantiate = generic_key_instantiate,
181 .revoke = user_revoke,
182 .destroy = user_destroy,
183 .describe = user_describe,
184 .read = user_read,
185 };
186
187 int nfs_idmap_init(void)
188 {
189 struct cred *cred;
190 struct key *keyring;
191 int ret = 0;
192
193 printk(KERN_NOTICE "NFS: Registering the %s key type\n",
194 key_type_id_resolver.name);
195
196 cred = prepare_kernel_cred(NULL);
197 if (!cred)
198 return -ENOMEM;
199
200 keyring = keyring_alloc(".id_resolver",
201 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
202 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
203 KEY_USR_VIEW | KEY_USR_READ,
204 KEY_ALLOC_NOT_IN_QUOTA, NULL);
205 if (IS_ERR(keyring)) {
206 ret = PTR_ERR(keyring);
207 goto failed_put_cred;
208 }
209
210 ret = register_key_type(&key_type_id_resolver);
211 if (ret < 0)
212 goto failed_put_key;
213
214 ret = register_key_type(&key_type_id_resolver_legacy);
215 if (ret < 0)
216 goto failed_reg_legacy;
217
218 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
219 cred->thread_keyring = keyring;
220 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
221 id_resolver_cache = cred;
222 return 0;
223
224 failed_reg_legacy:
225 unregister_key_type(&key_type_id_resolver);
226 failed_put_key:
227 key_put(keyring);
228 failed_put_cred:
229 put_cred(cred);
230 return ret;
231 }
232
233 void nfs_idmap_quit(void)
234 {
235 key_revoke(id_resolver_cache->thread_keyring);
236 unregister_key_type(&key_type_id_resolver);
237 unregister_key_type(&key_type_id_resolver_legacy);
238 put_cred(id_resolver_cache);
239 }
240
241 /*
242 * Assemble the description to pass to request_key()
243 * This function will allocate a new string and update dest to point
244 * at it. The caller is responsible for freeing dest.
245 *
246 * On error 0 is returned. Otherwise, the length of dest is returned.
247 */
248 static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
249 const char *type, size_t typelen, char **desc)
250 {
251 char *cp;
252 size_t desclen = typelen + namelen + 2;
253
254 *desc = kmalloc(desclen, GFP_KERNEL);
255 if (!*desc)
256 return -ENOMEM;
257
258 cp = *desc;
259 memcpy(cp, type, typelen);
260 cp += typelen;
261 *cp++ = ':';
262
263 memcpy(cp, name, namelen);
264 cp += namelen;
265 *cp = '\0';
266 return desclen;
267 }
268
269 static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
270 const char *type, struct idmap *idmap)
271 {
272 char *desc;
273 struct key *rkey;
274 ssize_t ret;
275
276 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
277 if (ret <= 0)
278 return ERR_PTR(ret);
279
280 rkey = request_key(&key_type_id_resolver, desc, "");
281 if (IS_ERR(rkey)) {
282 mutex_lock(&idmap->idmap_mutex);
283 rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
284 desc, "", 0, idmap);
285 mutex_unlock(&idmap->idmap_mutex);
286 }
287 if (!IS_ERR(rkey))
288 set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
289
290 kfree(desc);
291 return rkey;
292 }
293
294 static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
295 const char *type, void *data,
296 size_t data_size, struct idmap *idmap)
297 {
298 const struct cred *saved_cred;
299 struct key *rkey;
300 const struct user_key_payload *payload;
301 ssize_t ret;
302
303 saved_cred = override_creds(id_resolver_cache);
304 rkey = nfs_idmap_request_key(name, namelen, type, idmap);
305 revert_creds(saved_cred);
306
307 if (IS_ERR(rkey)) {
308 ret = PTR_ERR(rkey);
309 goto out;
310 }
311
312 rcu_read_lock();
313 rkey->perm |= KEY_USR_VIEW;
314
315 ret = key_validate(rkey);
316 if (ret < 0)
317 goto out_up;
318
319 payload = user_key_payload(rkey);
320 if (IS_ERR_OR_NULL(payload)) {
321 ret = PTR_ERR(payload);
322 goto out_up;
323 }
324
325 ret = payload->datalen;
326 if (ret > 0 && ret <= data_size)
327 memcpy(data, payload->data, ret);
328 else
329 ret = -EINVAL;
330
331 out_up:
332 rcu_read_unlock();
333 key_put(rkey);
334 out:
335 return ret;
336 }
337
338 /* ID -> Name */
339 static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
340 size_t buflen, struct idmap *idmap)
341 {
342 char id_str[NFS_UINT_MAXLEN];
343 int id_len;
344 ssize_t ret;
345
346 id_len = snprintf(id_str, sizeof(id_str), "%u", id);
347 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
348 if (ret < 0)
349 return -EINVAL;
350 return ret;
351 }
352
353 /* Name -> ID */
354 static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
355 __u32 *id, struct idmap *idmap)
356 {
357 char id_str[NFS_UINT_MAXLEN];
358 long id_long;
359 ssize_t data_size;
360 int ret = 0;
361
362 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
363 if (data_size <= 0) {
364 ret = -EINVAL;
365 } else {
366 ret = kstrtol(id_str, 10, &id_long);
367 *id = (__u32)id_long;
368 }
369 return ret;
370 }
371
372 /* idmap classic begins here */
373
374 enum {
375 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
376 };
377
378 static const match_table_t nfs_idmap_tokens = {
379 { Opt_find_uid, "uid:%s" },
380 { Opt_find_gid, "gid:%s" },
381 { Opt_find_user, "user:%s" },
382 { Opt_find_group, "group:%s" },
383 { Opt_find_err, NULL }
384 };
385
386 static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
387 static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
388 size_t);
389 static void idmap_release_pipe(struct inode *);
390 static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
391
392 static const struct rpc_pipe_ops idmap_upcall_ops = {
393 .upcall = rpc_pipe_generic_upcall,
394 .downcall = idmap_pipe_downcall,
395 .release_pipe = idmap_release_pipe,
396 .destroy_msg = idmap_pipe_destroy_msg,
397 };
398
399 static struct key_type key_type_id_resolver_legacy = {
400 .name = "id_legacy",
401 .preparse = user_preparse,
402 .free_preparse = user_free_preparse,
403 .instantiate = generic_key_instantiate,
404 .revoke = user_revoke,
405 .destroy = user_destroy,
406 .describe = user_describe,
407 .read = user_read,
408 .request_key = nfs_idmap_legacy_upcall,
409 };
410
411 static void nfs_idmap_pipe_destroy(struct dentry *dir,
412 struct rpc_pipe_dir_object *pdo)
413 {
414 struct idmap *idmap = pdo->pdo_data;
415 struct rpc_pipe *pipe = idmap->idmap_pipe;
416
417 if (pipe->dentry) {
418 rpc_unlink(pipe->dentry);
419 pipe->dentry = NULL;
420 }
421 }
422
423 static int nfs_idmap_pipe_create(struct dentry *dir,
424 struct rpc_pipe_dir_object *pdo)
425 {
426 struct idmap *idmap = pdo->pdo_data;
427 struct rpc_pipe *pipe = idmap->idmap_pipe;
428 struct dentry *dentry;
429
430 dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
431 if (IS_ERR(dentry))
432 return PTR_ERR(dentry);
433 pipe->dentry = dentry;
434 return 0;
435 }
436
437 static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
438 .create = nfs_idmap_pipe_create,
439 .destroy = nfs_idmap_pipe_destroy,
440 };
441
442 int
443 nfs_idmap_new(struct nfs_client *clp)
444 {
445 struct idmap *idmap;
446 struct rpc_pipe *pipe;
447 int error;
448
449 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
450 if (idmap == NULL)
451 return -ENOMEM;
452
453 rpc_init_pipe_dir_object(&idmap->idmap_pdo,
454 &nfs_idmap_pipe_dir_object_ops,
455 idmap);
456
457 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
458 if (IS_ERR(pipe)) {
459 error = PTR_ERR(pipe);
460 goto err;
461 }
462 idmap->idmap_pipe = pipe;
463 mutex_init(&idmap->idmap_mutex);
464
465 error = rpc_add_pipe_dir_object(clp->cl_net,
466 &clp->cl_rpcclient->cl_pipedir_objects,
467 &idmap->idmap_pdo);
468 if (error)
469 goto err_destroy_pipe;
470
471 clp->cl_idmap = idmap;
472 return 0;
473 err_destroy_pipe:
474 rpc_destroy_pipe_data(idmap->idmap_pipe);
475 err:
476 kfree(idmap);
477 return error;
478 }
479
480 void
481 nfs_idmap_delete(struct nfs_client *clp)
482 {
483 struct idmap *idmap = clp->cl_idmap;
484
485 if (!idmap)
486 return;
487 clp->cl_idmap = NULL;
488 rpc_remove_pipe_dir_object(clp->cl_net,
489 &clp->cl_rpcclient->cl_pipedir_objects,
490 &idmap->idmap_pdo);
491 rpc_destroy_pipe_data(idmap->idmap_pipe);
492 kfree(idmap);
493 }
494
495 static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
496 struct idmap_msg *im,
497 struct rpc_pipe_msg *msg)
498 {
499 substring_t substr;
500 int token, ret;
501
502 im->im_type = IDMAP_TYPE_GROUP;
503 token = match_token(desc, nfs_idmap_tokens, &substr);
504
505 switch (token) {
506 case Opt_find_uid:
507 im->im_type = IDMAP_TYPE_USER;
508 case Opt_find_gid:
509 im->im_conv = IDMAP_CONV_NAMETOID;
510 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
511 break;
512
513 case Opt_find_user:
514 im->im_type = IDMAP_TYPE_USER;
515 case Opt_find_group:
516 im->im_conv = IDMAP_CONV_IDTONAME;
517 ret = match_int(&substr, &im->im_id);
518 break;
519
520 default:
521 ret = -EINVAL;
522 goto out;
523 }
524
525 msg->data = im;
526 msg->len = sizeof(struct idmap_msg);
527
528 out:
529 return ret;
530 }
531
532 static bool
533 nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
534 struct idmap_legacy_upcalldata *data)
535 {
536 if (idmap->idmap_upcall_data != NULL) {
537 WARN_ON_ONCE(1);
538 return false;
539 }
540 idmap->idmap_upcall_data = data;
541 return true;
542 }
543
544 static void
545 nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
546 {
547 struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
548
549 kfree(idmap->idmap_upcall_data);
550 idmap->idmap_upcall_data = NULL;
551 complete_request_key(cons, ret);
552 }
553
554 static void
555 nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
556 {
557 if (idmap->idmap_upcall_data != NULL)
558 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
559 }
560
561 static int nfs_idmap_legacy_upcall(struct key_construction *cons,
562 const char *op,
563 void *aux)
564 {
565 struct idmap_legacy_upcalldata *data;
566 struct rpc_pipe_msg *msg;
567 struct idmap_msg *im;
568 struct idmap *idmap = (struct idmap *)aux;
569 struct key *key = cons->key;
570 int ret = -ENOMEM;
571
572 /* msg and im are freed in idmap_pipe_destroy_msg */
573 data = kzalloc(sizeof(*data), GFP_KERNEL);
574 if (!data)
575 goto out1;
576
577 msg = &data->pipe_msg;
578 im = &data->idmap_msg;
579 data->idmap = idmap;
580 data->key_cons = cons;
581
582 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
583 if (ret < 0)
584 goto out2;
585
586 ret = -EAGAIN;
587 if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
588 goto out2;
589
590 ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
591 if (ret < 0)
592 nfs_idmap_abort_pipe_upcall(idmap, ret);
593
594 return ret;
595 out2:
596 kfree(data);
597 out1:
598 complete_request_key(cons, ret);
599 return ret;
600 }
601
602 static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
603 {
604 return key_instantiate_and_link(key, data, datalen,
605 id_resolver_cache->thread_keyring,
606 authkey);
607 }
608
609 static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
610 struct idmap_msg *upcall,
611 struct key *key, struct key *authkey)
612 {
613 char id_str[NFS_UINT_MAXLEN];
614 size_t len;
615 int ret = -ENOKEY;
616
617 /* ret = -ENOKEY */
618 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
619 goto out;
620 switch (im->im_conv) {
621 case IDMAP_CONV_NAMETOID:
622 if (strcmp(upcall->im_name, im->im_name) != 0)
623 break;
624 /* Note: here we store the NUL terminator too */
625 len = sprintf(id_str, "%d", im->im_id) + 1;
626 ret = nfs_idmap_instantiate(key, authkey, id_str, len);
627 break;
628 case IDMAP_CONV_IDTONAME:
629 if (upcall->im_id != im->im_id)
630 break;
631 len = strlen(im->im_name);
632 ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
633 break;
634 default:
635 ret = -EINVAL;
636 }
637 out:
638 return ret;
639 }
640
641 static ssize_t
642 idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
643 {
644 struct rpc_inode *rpci = RPC_I(file_inode(filp));
645 struct idmap *idmap = (struct idmap *)rpci->private;
646 struct key_construction *cons;
647 struct idmap_msg im;
648 size_t namelen_in;
649 int ret = -ENOKEY;
650
651 /* If instantiation is successful, anyone waiting for key construction
652 * will have been woken up and someone else may now have used
653 * idmap_key_cons - so after this point we may no longer touch it.
654 */
655 if (idmap->idmap_upcall_data == NULL)
656 goto out_noupcall;
657
658 cons = idmap->idmap_upcall_data->key_cons;
659
660 if (mlen != sizeof(im)) {
661 ret = -ENOSPC;
662 goto out;
663 }
664
665 if (copy_from_user(&im, src, mlen) != 0) {
666 ret = -EFAULT;
667 goto out;
668 }
669
670 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
671 ret = -ENOKEY;
672 goto out;
673 }
674
675 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
676 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
677 ret = -EINVAL;
678 goto out;
679 }
680
681 ret = nfs_idmap_read_and_verify_message(&im,
682 &idmap->idmap_upcall_data->idmap_msg,
683 cons->key, cons->authkey);
684 if (ret >= 0) {
685 key_set_timeout(cons->key, nfs_idmap_cache_timeout);
686 ret = mlen;
687 }
688
689 out:
690 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
691 out_noupcall:
692 return ret;
693 }
694
695 static void
696 idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
697 {
698 struct idmap_legacy_upcalldata *data = container_of(msg,
699 struct idmap_legacy_upcalldata,
700 pipe_msg);
701 struct idmap *idmap = data->idmap;
702
703 if (msg->errno)
704 nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
705 }
706
707 static void
708 idmap_release_pipe(struct inode *inode)
709 {
710 struct rpc_inode *rpci = RPC_I(inode);
711 struct idmap *idmap = (struct idmap *)rpci->private;
712
713 nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
714 }
715
716 int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
717 {
718 struct idmap *idmap = server->nfs_client->cl_idmap;
719 __u32 id = -1;
720 int ret = 0;
721
722 if (!nfs_map_string_to_numeric(name, namelen, &id))
723 ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
724 if (ret == 0) {
725 *uid = make_kuid(&init_user_ns, id);
726 if (!uid_valid(*uid))
727 ret = -ERANGE;
728 }
729 trace_nfs4_map_name_to_uid(name, namelen, id, ret);
730 return ret;
731 }
732
733 int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
734 {
735 struct idmap *idmap = server->nfs_client->cl_idmap;
736 __u32 id = -1;
737 int ret = 0;
738
739 if (!nfs_map_string_to_numeric(name, namelen, &id))
740 ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
741 if (ret == 0) {
742 *gid = make_kgid(&init_user_ns, id);
743 if (!gid_valid(*gid))
744 ret = -ERANGE;
745 }
746 trace_nfs4_map_group_to_gid(name, namelen, id, ret);
747 return ret;
748 }
749
750 int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
751 {
752 struct idmap *idmap = server->nfs_client->cl_idmap;
753 int ret = -EINVAL;
754 __u32 id;
755
756 id = from_kuid(&init_user_ns, uid);
757 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
758 ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
759 if (ret < 0)
760 ret = nfs_map_numeric_to_string(id, buf, buflen);
761 trace_nfs4_map_uid_to_name(buf, ret, id, ret);
762 return ret;
763 }
764 int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
765 {
766 struct idmap *idmap = server->nfs_client->cl_idmap;
767 int ret = -EINVAL;
768 __u32 id;
769
770 id = from_kgid(&init_user_ns, gid);
771 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
772 ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
773 if (ret < 0)
774 ret = nfs_map_numeric_to_string(id, buf, buflen);
775 trace_nfs4_map_gid_to_group(buf, ret, id, ret);
776 return ret;
777 }