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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         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 = rcu_dereference(rkey->payload.rcudata);
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 }