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36#include <linux/types.h>
37#include <linux/parser.h>
38#include <linux/fs.h>
39#include <linux/nfs_idmap.h>
40#include <net/net_namespace.h>
41#include <linux/sunrpc/rpc_pipe_fs.h>
42#include <linux/nfs_fs.h>
43#include <linux/nfs_fs_sb.h>
44#include <linux/key.h>
45#include <linux/keyctl.h>
46#include <linux/key-type.h>
47#include <keys/user-type.h>
48#include <linux/module.h>
49
50#include "internal.h"
51#include "netns.h"
52
53#define NFS_UINT_MAXLEN 11
54
55static const struct cred *id_resolver_cache;
56static struct key_type key_type_id_resolver_legacy;
57
58struct idmap_legacy_upcalldata {
59 struct rpc_pipe_msg pipe_msg;
60 struct idmap_msg idmap_msg;
61 struct key_construction *key_cons;
62 struct idmap *idmap;
63};
64
65struct idmap {
66 struct rpc_pipe *idmap_pipe;
67 struct idmap_legacy_upcalldata *idmap_upcall_data;
68 struct mutex idmap_mutex;
69};
70
71
72
73
74
75
76
77void nfs_fattr_init_names(struct nfs_fattr *fattr,
78 struct nfs4_string *owner_name,
79 struct nfs4_string *group_name)
80{
81 fattr->owner_name = owner_name;
82 fattr->group_name = group_name;
83}
84
85static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
86{
87 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
88 kfree(fattr->owner_name->data);
89}
90
91static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
92{
93 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
94 kfree(fattr->group_name->data);
95}
96
97static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
98{
99 struct nfs4_string *owner = fattr->owner_name;
100 kuid_t uid;
101
102 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
103 return false;
104 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
105 fattr->uid = uid;
106 fattr->valid |= NFS_ATTR_FATTR_OWNER;
107 }
108 return true;
109}
110
111static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
112{
113 struct nfs4_string *group = fattr->group_name;
114 kgid_t gid;
115
116 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
117 return false;
118 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
119 fattr->gid = gid;
120 fattr->valid |= NFS_ATTR_FATTR_GROUP;
121 }
122 return true;
123}
124
125
126
127
128
129void nfs_fattr_free_names(struct nfs_fattr *fattr)
130{
131 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
132 nfs_fattr_free_owner_name(fattr);
133 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
134 nfs_fattr_free_group_name(fattr);
135}
136
137
138
139
140
141
142
143
144
145void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
146{
147 if (nfs_fattr_map_owner_name(server, fattr))
148 nfs_fattr_free_owner_name(fattr);
149 if (nfs_fattr_map_group_name(server, fattr))
150 nfs_fattr_free_group_name(fattr);
151}
152
153static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
154{
155 unsigned long val;
156 char buf[16];
157
158 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
159 return 0;
160 memcpy(buf, name, namelen);
161 buf[namelen] = '\0';
162 if (kstrtoul(buf, 0, &val) != 0)
163 return 0;
164 *res = val;
165 return 1;
166}
167
168static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
169{
170 return snprintf(buf, buflen, "%u", id);
171}
172
173static struct key_type key_type_id_resolver = {
174 .name = "id_resolver",
175 .instantiate = user_instantiate,
176 .match = user_match,
177 .revoke = user_revoke,
178 .destroy = user_destroy,
179 .describe = user_describe,
180 .read = user_read,
181};
182
183static int nfs_idmap_init_keyring(void)
184{
185 struct cred *cred;
186 struct key *keyring;
187 int ret = 0;
188
189 printk(KERN_NOTICE "NFS: Registering the %s key type\n",
190 key_type_id_resolver.name);
191
192 cred = prepare_kernel_cred(NULL);
193 if (!cred)
194 return -ENOMEM;
195
196 keyring = keyring_alloc(".id_resolver",
197 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
198 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
199 KEY_USR_VIEW | KEY_USR_READ,
200 KEY_ALLOC_NOT_IN_QUOTA, NULL);
201 if (IS_ERR(keyring)) {
202 ret = PTR_ERR(keyring);
203 goto failed_put_cred;
204 }
205
206 ret = register_key_type(&key_type_id_resolver);
207 if (ret < 0)
208 goto failed_put_key;
209
210 ret = register_key_type(&key_type_id_resolver_legacy);
211 if (ret < 0)
212 goto failed_reg_legacy;
213
214 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
215 cred->thread_keyring = keyring;
216 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
217 id_resolver_cache = cred;
218 return 0;
219
220failed_reg_legacy:
221 unregister_key_type(&key_type_id_resolver);
222failed_put_key:
223 key_put(keyring);
224failed_put_cred:
225 put_cred(cred);
226 return ret;
227}
228
229static void nfs_idmap_quit_keyring(void)
230{
231 key_revoke(id_resolver_cache->thread_keyring);
232 unregister_key_type(&key_type_id_resolver);
233 unregister_key_type(&key_type_id_resolver_legacy);
234 put_cred(id_resolver_cache);
235}
236
237
238
239
240
241
242
243
244static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
245 const char *type, size_t typelen, char **desc)
246{
247 char *cp;
248 size_t desclen = typelen + namelen + 2;
249
250 *desc = kmalloc(desclen, GFP_KERNEL);
251 if (!*desc)
252 return -ENOMEM;
253
254 cp = *desc;
255 memcpy(cp, type, typelen);
256 cp += typelen;
257 *cp++ = ':';
258
259 memcpy(cp, name, namelen);
260 cp += namelen;
261 *cp = '\0';
262 return desclen;
263}
264
265static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
266 const char *type, struct idmap *idmap)
267{
268 char *desc;
269 struct key *rkey;
270 ssize_t ret;
271
272 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
273 if (ret <= 0)
274 return ERR_PTR(ret);
275
276 rkey = request_key(&key_type_id_resolver, desc, "");
277 if (IS_ERR(rkey)) {
278 mutex_lock(&idmap->idmap_mutex);
279 rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
280 desc, "", 0, idmap);
281 mutex_unlock(&idmap->idmap_mutex);
282 }
283
284 kfree(desc);
285 return rkey;
286}
287
288static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
289 const char *type, void *data,
290 size_t data_size, struct idmap *idmap)
291{
292 const struct cred *saved_cred;
293 struct key *rkey;
294 struct user_key_payload *payload;
295 ssize_t ret;
296
297 saved_cred = override_creds(id_resolver_cache);
298 rkey = nfs_idmap_request_key(name, namelen, type, idmap);
299 revert_creds(saved_cred);
300
301 if (IS_ERR(rkey)) {
302 ret = PTR_ERR(rkey);
303 goto out;
304 }
305
306 rcu_read_lock();
307 rkey->perm |= KEY_USR_VIEW;
308
309 ret = key_validate(rkey);
310 if (ret < 0)
311 goto out_up;
312
313 payload = rcu_dereference(rkey->payload.data);
314 if (IS_ERR_OR_NULL(payload)) {
315 ret = PTR_ERR(payload);
316 goto out_up;
317 }
318
319 ret = payload->datalen;
320 if (ret > 0 && ret <= data_size)
321 memcpy(data, payload->data, ret);
322 else
323 ret = -EINVAL;
324
325out_up:
326 rcu_read_unlock();
327 key_put(rkey);
328out:
329 return ret;
330}
331
332
333static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
334 size_t buflen, struct idmap *idmap)
335{
336 char id_str[NFS_UINT_MAXLEN];
337 int id_len;
338 ssize_t ret;
339
340 id_len = snprintf(id_str, sizeof(id_str), "%u", id);
341 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
342 if (ret < 0)
343 return -EINVAL;
344 return ret;
345}
346
347
348static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
349 __u32 *id, struct idmap *idmap)
350{
351 char id_str[NFS_UINT_MAXLEN];
352 long id_long;
353 ssize_t data_size;
354 int ret = 0;
355
356 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
357 if (data_size <= 0) {
358 ret = -EINVAL;
359 } else {
360 ret = kstrtol(id_str, 10, &id_long);
361 *id = (__u32)id_long;
362 }
363 return ret;
364}
365
366
367
368enum {
369 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
370};
371
372static const match_table_t nfs_idmap_tokens = {
373 { Opt_find_uid, "uid:%s" },
374 { Opt_find_gid, "gid:%s" },
375 { Opt_find_user, "user:%s" },
376 { Opt_find_group, "group:%s" },
377 { Opt_find_err, NULL }
378};
379
380static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
381static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
382 size_t);
383static void idmap_release_pipe(struct inode *);
384static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
385
386static const struct rpc_pipe_ops idmap_upcall_ops = {
387 .upcall = rpc_pipe_generic_upcall,
388 .downcall = idmap_pipe_downcall,
389 .release_pipe = idmap_release_pipe,
390 .destroy_msg = idmap_pipe_destroy_msg,
391};
392
393static struct key_type key_type_id_resolver_legacy = {
394 .name = "id_legacy",
395 .instantiate = user_instantiate,
396 .match = user_match,
397 .revoke = user_revoke,
398 .destroy = user_destroy,
399 .describe = user_describe,
400 .read = user_read,
401 .request_key = nfs_idmap_legacy_upcall,
402};
403
404static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
405{
406 if (pipe->dentry)
407 rpc_unlink(pipe->dentry);
408}
409
410static int __nfs_idmap_register(struct dentry *dir,
411 struct idmap *idmap,
412 struct rpc_pipe *pipe)
413{
414 struct dentry *dentry;
415
416 dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
417 if (IS_ERR(dentry))
418 return PTR_ERR(dentry);
419 pipe->dentry = dentry;
420 return 0;
421}
422
423static void nfs_idmap_unregister(struct nfs_client *clp,
424 struct rpc_pipe *pipe)
425{
426 struct net *net = clp->cl_net;
427 struct super_block *pipefs_sb;
428
429 pipefs_sb = rpc_get_sb_net(net);
430 if (pipefs_sb) {
431 __nfs_idmap_unregister(pipe);
432 rpc_put_sb_net(net);
433 }
434}
435
436static int nfs_idmap_register(struct nfs_client *clp,
437 struct idmap *idmap,
438 struct rpc_pipe *pipe)
439{
440 struct net *net = clp->cl_net;
441 struct super_block *pipefs_sb;
442 int err = 0;
443
444 pipefs_sb = rpc_get_sb_net(net);
445 if (pipefs_sb) {
446 if (clp->cl_rpcclient->cl_dentry)
447 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
448 idmap, pipe);
449 rpc_put_sb_net(net);
450 }
451 return err;
452}
453
454int
455nfs_idmap_new(struct nfs_client *clp)
456{
457 struct idmap *idmap;
458 struct rpc_pipe *pipe;
459 int error;
460
461 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
462 if (idmap == NULL)
463 return -ENOMEM;
464
465 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
466 if (IS_ERR(pipe)) {
467 error = PTR_ERR(pipe);
468 kfree(idmap);
469 return error;
470 }
471 error = nfs_idmap_register(clp, idmap, pipe);
472 if (error) {
473 rpc_destroy_pipe_data(pipe);
474 kfree(idmap);
475 return error;
476 }
477 idmap->idmap_pipe = pipe;
478 mutex_init(&idmap->idmap_mutex);
479
480 clp->cl_idmap = idmap;
481 return 0;
482}
483
484void
485nfs_idmap_delete(struct nfs_client *clp)
486{
487 struct idmap *idmap = clp->cl_idmap;
488
489 if (!idmap)
490 return;
491 nfs_idmap_unregister(clp, idmap->idmap_pipe);
492 rpc_destroy_pipe_data(idmap->idmap_pipe);
493 clp->cl_idmap = NULL;
494 kfree(idmap);
495}
496
497static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
498 struct super_block *sb)
499{
500 int err = 0;
501
502 switch (event) {
503 case RPC_PIPEFS_MOUNT:
504 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
505 clp->cl_idmap,
506 clp->cl_idmap->idmap_pipe);
507 break;
508 case RPC_PIPEFS_UMOUNT:
509 if (clp->cl_idmap->idmap_pipe) {
510 struct dentry *parent;
511
512 parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
513 __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
514
515
516
517
518
519
520
521 if (rpc_rmdir(parent))
522 printk(KERN_ERR "NFS: %s: failed to remove "
523 "clnt dir!\n", __func__);
524 }
525 break;
526 default:
527 printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
528 event);
529 return -ENOTSUPP;
530 }
531 return err;
532}
533
534static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
535{
536 struct nfs_net *nn = net_generic(net, nfs_net_id);
537 struct dentry *cl_dentry;
538 struct nfs_client *clp;
539 int err;
540
541restart:
542 spin_lock(&nn->nfs_client_lock);
543 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
544
545 if (clp->cl_cons_state == NFS_CS_INITING) {
546 atomic_inc(&clp->cl_count);
547 spin_unlock(&nn->nfs_client_lock);
548 err = nfs_wait_client_init_complete(clp);
549 nfs_put_client(clp);
550 if (err)
551 return NULL;
552 goto restart;
553 }
554
555 if (clp->cl_cons_state < 0)
556 continue;
557 smp_rmb();
558 if (clp->rpc_ops != &nfs_v4_clientops)
559 continue;
560 cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
561 if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
562 ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
563 continue;
564 atomic_inc(&clp->cl_count);
565 spin_unlock(&nn->nfs_client_lock);
566 return clp;
567 }
568 spin_unlock(&nn->nfs_client_lock);
569 return NULL;
570}
571
572static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
573 void *ptr)
574{
575 struct super_block *sb = ptr;
576 struct nfs_client *clp;
577 int error = 0;
578
579 if (!try_module_get(THIS_MODULE))
580 return 0;
581
582 while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
583 error = __rpc_pipefs_event(clp, event, sb);
584 nfs_put_client(clp);
585 if (error)
586 break;
587 }
588 module_put(THIS_MODULE);
589 return error;
590}
591
592#define PIPEFS_NFS_PRIO 1
593
594static struct notifier_block nfs_idmap_block = {
595 .notifier_call = rpc_pipefs_event,
596 .priority = SUNRPC_PIPEFS_NFS_PRIO,
597};
598
599int nfs_idmap_init(void)
600{
601 int ret;
602 ret = nfs_idmap_init_keyring();
603 if (ret != 0)
604 goto out;
605 ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
606 if (ret != 0)
607 nfs_idmap_quit_keyring();
608out:
609 return ret;
610}
611
612void nfs_idmap_quit(void)
613{
614 rpc_pipefs_notifier_unregister(&nfs_idmap_block);
615 nfs_idmap_quit_keyring();
616}
617
618static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
619 struct idmap_msg *im,
620 struct rpc_pipe_msg *msg)
621{
622 substring_t substr;
623 int token, ret;
624
625 im->im_type = IDMAP_TYPE_GROUP;
626 token = match_token(desc, nfs_idmap_tokens, &substr);
627
628 switch (token) {
629 case Opt_find_uid:
630 im->im_type = IDMAP_TYPE_USER;
631 case Opt_find_gid:
632 im->im_conv = IDMAP_CONV_NAMETOID;
633 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
634 break;
635
636 case Opt_find_user:
637 im->im_type = IDMAP_TYPE_USER;
638 case Opt_find_group:
639 im->im_conv = IDMAP_CONV_IDTONAME;
640 ret = match_int(&substr, &im->im_id);
641 break;
642
643 default:
644 ret = -EINVAL;
645 goto out;
646 }
647
648 msg->data = im;
649 msg->len = sizeof(struct idmap_msg);
650
651out:
652 return ret;
653}
654
655static bool
656nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
657 struct idmap_legacy_upcalldata *data)
658{
659 if (idmap->idmap_upcall_data != NULL) {
660 WARN_ON_ONCE(1);
661 return false;
662 }
663 idmap->idmap_upcall_data = data;
664 return true;
665}
666
667static void
668nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
669{
670 struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
671
672 kfree(idmap->idmap_upcall_data);
673 idmap->idmap_upcall_data = NULL;
674 complete_request_key(cons, ret);
675}
676
677static void
678nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
679{
680 if (idmap->idmap_upcall_data != NULL)
681 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
682}
683
684static int nfs_idmap_legacy_upcall(struct key_construction *cons,
685 const char *op,
686 void *aux)
687{
688 struct idmap_legacy_upcalldata *data;
689 struct rpc_pipe_msg *msg;
690 struct idmap_msg *im;
691 struct idmap *idmap = (struct idmap *)aux;
692 struct key *key = cons->key;
693 int ret = -ENOMEM;
694
695
696 data = kzalloc(sizeof(*data), GFP_KERNEL);
697 if (!data)
698 goto out1;
699
700 msg = &data->pipe_msg;
701 im = &data->idmap_msg;
702 data->idmap = idmap;
703 data->key_cons = cons;
704
705 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
706 if (ret < 0)
707 goto out2;
708
709 ret = -EAGAIN;
710 if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
711 goto out2;
712
713 ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
714 if (ret < 0)
715 nfs_idmap_abort_pipe_upcall(idmap, ret);
716
717 return ret;
718out2:
719 kfree(data);
720out1:
721 complete_request_key(cons, ret);
722 return ret;
723}
724
725static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
726{
727 return key_instantiate_and_link(key, data, datalen,
728 id_resolver_cache->thread_keyring,
729 authkey);
730}
731
732static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
733 struct idmap_msg *upcall,
734 struct key *key, struct key *authkey)
735{
736 char id_str[NFS_UINT_MAXLEN];
737 size_t len;
738 int ret = -ENOKEY;
739
740
741 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
742 goto out;
743 switch (im->im_conv) {
744 case IDMAP_CONV_NAMETOID:
745 if (strcmp(upcall->im_name, im->im_name) != 0)
746 break;
747
748 len = sprintf(id_str, "%d", im->im_id) + 1;
749 ret = nfs_idmap_instantiate(key, authkey, id_str, len);
750 break;
751 case IDMAP_CONV_IDTONAME:
752 if (upcall->im_id != im->im_id)
753 break;
754 len = strlen(im->im_name);
755 ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
756 break;
757 default:
758 ret = -EINVAL;
759 }
760out:
761 return ret;
762}
763
764static ssize_t
765idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
766{
767 struct rpc_inode *rpci = RPC_I(file_inode(filp));
768 struct idmap *idmap = (struct idmap *)rpci->private;
769 struct key_construction *cons;
770 struct idmap_msg im;
771 size_t namelen_in;
772 int ret = -ENOKEY;
773
774
775
776
777
778 if (idmap->idmap_upcall_data == NULL)
779 goto out_noupcall;
780
781 cons = idmap->idmap_upcall_data->key_cons;
782
783 if (mlen != sizeof(im)) {
784 ret = -ENOSPC;
785 goto out;
786 }
787
788 if (copy_from_user(&im, src, mlen) != 0) {
789 ret = -EFAULT;
790 goto out;
791 }
792
793 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
794 ret = -ENOKEY;
795 goto out;
796 }
797
798 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
799 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
800 ret = -EINVAL;
801 goto out;
802}
803
804 ret = nfs_idmap_read_and_verify_message(&im,
805 &idmap->idmap_upcall_data->idmap_msg,
806 cons->key, cons->authkey);
807 if (ret >= 0) {
808 key_set_timeout(cons->key, nfs_idmap_cache_timeout);
809 ret = mlen;
810 }
811
812out:
813 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
814out_noupcall:
815 return ret;
816}
817
818static void
819idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
820{
821 struct idmap_legacy_upcalldata *data = container_of(msg,
822 struct idmap_legacy_upcalldata,
823 pipe_msg);
824 struct idmap *idmap = data->idmap;
825
826 if (msg->errno)
827 nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
828}
829
830static void
831idmap_release_pipe(struct inode *inode)
832{
833 struct rpc_inode *rpci = RPC_I(inode);
834 struct idmap *idmap = (struct idmap *)rpci->private;
835
836 nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
837}
838
839int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
840{
841 struct idmap *idmap = server->nfs_client->cl_idmap;
842 __u32 id = -1;
843 int ret = 0;
844
845 if (!nfs_map_string_to_numeric(name, namelen, &id))
846 ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
847 if (ret == 0) {
848 *uid = make_kuid(&init_user_ns, id);
849 if (!uid_valid(*uid))
850 ret = -ERANGE;
851 }
852 return ret;
853}
854
855int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
856{
857 struct idmap *idmap = server->nfs_client->cl_idmap;
858 __u32 id = -1;
859 int ret = 0;
860
861 if (!nfs_map_string_to_numeric(name, namelen, &id))
862 ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
863 if (ret == 0) {
864 *gid = make_kgid(&init_user_ns, id);
865 if (!gid_valid(*gid))
866 ret = -ERANGE;
867 }
868 return ret;
869}
870
871int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
872{
873 struct idmap *idmap = server->nfs_client->cl_idmap;
874 int ret = -EINVAL;
875 __u32 id;
876
877 id = from_kuid(&init_user_ns, uid);
878 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
879 ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
880 if (ret < 0)
881 ret = nfs_map_numeric_to_string(id, buf, buflen);
882 return ret;
883}
884int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
885{
886 struct idmap *idmap = server->nfs_client->cl_idmap;
887 int ret = -EINVAL;
888 __u32 id;
889
890 id = from_kgid(&init_user_ns, gid);
891 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
892 ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
893 if (ret < 0)
894 ret = nfs_map_numeric_to_string(id, buf, buflen);
895 return ret;
896}
897