2 * linux/net/sunrpc/auth.c
4 * Generic RPC client authentication API.
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/hash.h>
15 #include <linux/sunrpc/clnt.h>
16 #include <linux/sunrpc/gss_api.h>
17 #include <linux/spinlock.h>
19 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
20 # define RPCDBG_FACILITY RPCDBG_AUTH
23 #define RPC_CREDCACHE_DEFAULT_HASHBITS (4)
24 struct rpc_cred_cache {
25 struct hlist_head *hashtable;
26 unsigned int hashbits;
30 static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS;
32 static DEFINE_SPINLOCK(rpc_authflavor_lock);
33 static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
34 &authnull_ops, /* AUTH_NULL */
35 &authunix_ops, /* AUTH_UNIX */
36 NULL, /* others can be loadable modules */
39 static LIST_HEAD(cred_unused);
40 static unsigned long number_cred_unused;
42 #define MAX_HASHTABLE_BITS (14)
43 static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp)
51 ret = kstrtoul(val, 0, &num);
55 if (nbits > MAX_HASHTABLE_BITS || nbits < 2)
57 *(unsigned int *)kp->arg = nbits;
63 static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp)
67 nbits = *(unsigned int *)kp->arg;
68 return sprintf(buffer, "%u", 1U << nbits);
71 #define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int);
73 static const struct kernel_param_ops param_ops_hashtbl_sz = {
74 .set = param_set_hashtbl_sz,
75 .get = param_get_hashtbl_sz,
78 module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644);
79 MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size");
81 static unsigned long auth_max_cred_cachesize = ULONG_MAX;
82 module_param(auth_max_cred_cachesize, ulong, 0644);
83 MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size");
86 pseudoflavor_to_flavor(u32 flavor) {
87 if (flavor > RPC_AUTH_MAXFLAVOR)
93 rpcauth_register(const struct rpc_authops *ops)
95 rpc_authflavor_t flavor;
98 if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
100 spin_lock(&rpc_authflavor_lock);
101 if (auth_flavors[flavor] == NULL) {
102 auth_flavors[flavor] = ops;
105 spin_unlock(&rpc_authflavor_lock);
108 EXPORT_SYMBOL_GPL(rpcauth_register);
111 rpcauth_unregister(const struct rpc_authops *ops)
113 rpc_authflavor_t flavor;
116 if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
118 spin_lock(&rpc_authflavor_lock);
119 if (auth_flavors[flavor] == ops) {
120 auth_flavors[flavor] = NULL;
123 spin_unlock(&rpc_authflavor_lock);
126 EXPORT_SYMBOL_GPL(rpcauth_unregister);
129 * rpcauth_get_pseudoflavor - check if security flavor is supported
130 * @flavor: a security flavor
131 * @info: a GSS mech OID, quality of protection, and service value
133 * Verifies that an appropriate kernel module is available or already loaded.
134 * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is
135 * not supported locally.
138 rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info)
140 const struct rpc_authops *ops;
141 rpc_authflavor_t pseudoflavor;
143 ops = auth_flavors[flavor];
145 request_module("rpc-auth-%u", flavor);
146 spin_lock(&rpc_authflavor_lock);
147 ops = auth_flavors[flavor];
148 if (ops == NULL || !try_module_get(ops->owner)) {
149 spin_unlock(&rpc_authflavor_lock);
150 return RPC_AUTH_MAXFLAVOR;
152 spin_unlock(&rpc_authflavor_lock);
154 pseudoflavor = flavor;
155 if (ops->info2flavor != NULL)
156 pseudoflavor = ops->info2flavor(info);
158 module_put(ops->owner);
161 EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor);
164 * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor
165 * @pseudoflavor: GSS pseudoflavor to match
166 * @info: rpcsec_gss_info structure to fill in
168 * Returns zero and fills in "info" if pseudoflavor matches a
169 * supported mechanism.
172 rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info)
174 rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor);
175 const struct rpc_authops *ops;
178 if (flavor >= RPC_AUTH_MAXFLAVOR)
181 ops = auth_flavors[flavor];
183 request_module("rpc-auth-%u", flavor);
184 spin_lock(&rpc_authflavor_lock);
185 ops = auth_flavors[flavor];
186 if (ops == NULL || !try_module_get(ops->owner)) {
187 spin_unlock(&rpc_authflavor_lock);
190 spin_unlock(&rpc_authflavor_lock);
193 if (ops->flavor2info != NULL)
194 result = ops->flavor2info(pseudoflavor, info);
196 module_put(ops->owner);
199 EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo);
202 * rpcauth_list_flavors - discover registered flavors and pseudoflavors
203 * @array: array to fill in
204 * @size: size of "array"
206 * Returns the number of array items filled in, or a negative errno.
208 * The returned array is not sorted by any policy. Callers should not
209 * rely on the order of the items in the returned array.
212 rpcauth_list_flavors(rpc_authflavor_t *array, int size)
214 rpc_authflavor_t flavor;
217 spin_lock(&rpc_authflavor_lock);
218 for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) {
219 const struct rpc_authops *ops = auth_flavors[flavor];
220 rpc_authflavor_t pseudos[4];
223 if (result >= size) {
230 if (ops->list_pseudoflavors == NULL) {
231 array[result++] = ops->au_flavor;
234 len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos));
239 for (i = 0; i < len; i++) {
240 if (result >= size) {
244 array[result++] = pseudos[i];
247 spin_unlock(&rpc_authflavor_lock);
249 dprintk("RPC: %s returns %d\n", __func__, result);
252 EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
255 rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
257 struct rpc_auth *auth;
258 const struct rpc_authops *ops;
259 u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor);
261 auth = ERR_PTR(-EINVAL);
262 if (flavor >= RPC_AUTH_MAXFLAVOR)
265 if ((ops = auth_flavors[flavor]) == NULL)
266 request_module("rpc-auth-%u", flavor);
267 spin_lock(&rpc_authflavor_lock);
268 ops = auth_flavors[flavor];
269 if (ops == NULL || !try_module_get(ops->owner)) {
270 spin_unlock(&rpc_authflavor_lock);
273 spin_unlock(&rpc_authflavor_lock);
274 auth = ops->create(args, clnt);
275 module_put(ops->owner);
279 rpcauth_release(clnt->cl_auth);
280 clnt->cl_auth = auth;
285 EXPORT_SYMBOL_GPL(rpcauth_create);
288 rpcauth_release(struct rpc_auth *auth)
290 if (!atomic_dec_and_test(&auth->au_count))
292 auth->au_ops->destroy(auth);
295 static DEFINE_SPINLOCK(rpc_credcache_lock);
298 rpcauth_unhash_cred_locked(struct rpc_cred *cred)
300 hlist_del_rcu(&cred->cr_hash);
301 smp_mb__before_atomic();
302 clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
306 rpcauth_unhash_cred(struct rpc_cred *cred)
308 spinlock_t *cache_lock;
311 cache_lock = &cred->cr_auth->au_credcache->lock;
312 spin_lock(cache_lock);
313 ret = atomic_read(&cred->cr_count) == 0;
315 rpcauth_unhash_cred_locked(cred);
316 spin_unlock(cache_lock);
321 * Initialize RPC credential cache
324 rpcauth_init_credcache(struct rpc_auth *auth)
326 struct rpc_cred_cache *new;
327 unsigned int hashsize;
329 new = kmalloc(sizeof(*new), GFP_KERNEL);
332 new->hashbits = auth_hashbits;
333 hashsize = 1U << new->hashbits;
334 new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL);
337 spin_lock_init(&new->lock);
338 auth->au_credcache = new;
345 EXPORT_SYMBOL_GPL(rpcauth_init_credcache);
348 * Setup a credential key lifetime timeout notification
351 rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
353 if (!cred->cr_auth->au_ops->key_timeout)
355 return cred->cr_auth->au_ops->key_timeout(auth, cred);
357 EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
360 rpcauth_cred_key_to_expire(struct rpc_auth *auth, struct rpc_cred *cred)
362 if (auth->au_flags & RPCAUTH_AUTH_NO_CRKEY_TIMEOUT)
364 if (!cred->cr_ops->crkey_to_expire)
366 return cred->cr_ops->crkey_to_expire(cred);
368 EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
371 rpcauth_stringify_acceptor(struct rpc_cred *cred)
373 if (!cred->cr_ops->crstringify_acceptor)
375 return cred->cr_ops->crstringify_acceptor(cred);
377 EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor);
380 * Destroy a list of credentials
383 void rpcauth_destroy_credlist(struct list_head *head)
385 struct rpc_cred *cred;
387 while (!list_empty(head)) {
388 cred = list_entry(head->next, struct rpc_cred, cr_lru);
389 list_del_init(&cred->cr_lru);
395 * Clear the RPC credential cache, and delete those credentials
396 * that are not referenced.
399 rpcauth_clear_credcache(struct rpc_cred_cache *cache)
402 struct hlist_head *head;
403 struct rpc_cred *cred;
404 unsigned int hashsize = 1U << cache->hashbits;
407 spin_lock(&rpc_credcache_lock);
408 spin_lock(&cache->lock);
409 for (i = 0; i < hashsize; i++) {
410 head = &cache->hashtable[i];
411 while (!hlist_empty(head)) {
412 cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
414 if (!list_empty(&cred->cr_lru)) {
415 list_del(&cred->cr_lru);
416 number_cred_unused--;
418 list_add_tail(&cred->cr_lru, &free);
419 rpcauth_unhash_cred_locked(cred);
422 spin_unlock(&cache->lock);
423 spin_unlock(&rpc_credcache_lock);
424 rpcauth_destroy_credlist(&free);
428 * Destroy the RPC credential cache
431 rpcauth_destroy_credcache(struct rpc_auth *auth)
433 struct rpc_cred_cache *cache = auth->au_credcache;
436 auth->au_credcache = NULL;
437 rpcauth_clear_credcache(cache);
438 kfree(cache->hashtable);
442 EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache);
445 #define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ)
448 * Remove stale credentials. Avoid sleeping inside the loop.
451 rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
453 spinlock_t *cache_lock;
454 struct rpc_cred *cred, *next;
455 unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM;
458 list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) {
460 if (nr_to_scan-- == 0)
463 * Enforce a 60 second garbage collection moratorium
464 * Note that the cred_unused list must be time-ordered.
466 if (time_in_range(cred->cr_expire, expired, jiffies) &&
467 test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
472 list_del_init(&cred->cr_lru);
473 number_cred_unused--;
475 if (atomic_read(&cred->cr_count) != 0)
478 cache_lock = &cred->cr_auth->au_credcache->lock;
479 spin_lock(cache_lock);
480 if (atomic_read(&cred->cr_count) == 0) {
482 list_add_tail(&cred->cr_lru, free);
483 rpcauth_unhash_cred_locked(cred);
485 spin_unlock(cache_lock);
491 rpcauth_cache_do_shrink(int nr_to_scan)
496 spin_lock(&rpc_credcache_lock);
497 freed = rpcauth_prune_expired(&free, nr_to_scan);
498 spin_unlock(&rpc_credcache_lock);
499 rpcauth_destroy_credlist(&free);
505 * Run memory cache shrinker.
508 rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
511 if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL)
514 /* nothing left, don't come back */
515 if (list_empty(&cred_unused))
518 return rpcauth_cache_do_shrink(sc->nr_to_scan);
522 rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
525 return number_cred_unused * sysctl_vfs_cache_pressure / 100;
529 rpcauth_cache_enforce_limit(void)
532 unsigned int nr_to_scan;
534 if (number_cred_unused <= auth_max_cred_cachesize)
536 diff = number_cred_unused - auth_max_cred_cachesize;
538 if (diff < nr_to_scan)
540 rpcauth_cache_do_shrink(nr_to_scan);
544 * Look up a process' credentials in the authentication cache
547 rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
548 int flags, gfp_t gfp)
551 struct rpc_cred_cache *cache = auth->au_credcache;
552 struct rpc_cred *cred = NULL,
556 nr = auth->au_ops->hash_cred(acred, cache->hashbits);
559 hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) {
560 if (!entry->cr_ops->crmatch(acred, entry, flags))
562 if (flags & RPCAUTH_LOOKUP_RCU) {
563 if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) &&
564 !test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags))
568 spin_lock(&cache->lock);
569 if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
570 spin_unlock(&cache->lock);
573 cred = get_rpccred(entry);
574 spin_unlock(&cache->lock);
582 if (flags & RPCAUTH_LOOKUP_RCU)
583 return ERR_PTR(-ECHILD);
585 new = auth->au_ops->crcreate(auth, acred, flags, gfp);
591 spin_lock(&cache->lock);
592 hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) {
593 if (!entry->cr_ops->crmatch(acred, entry, flags))
595 cred = get_rpccred(entry);
600 set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
601 hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
603 list_add_tail(&new->cr_lru, &free);
604 spin_unlock(&cache->lock);
605 rpcauth_cache_enforce_limit();
607 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
608 cred->cr_ops->cr_init != NULL &&
609 !(flags & RPCAUTH_LOOKUP_NEW)) {
610 int res = cred->cr_ops->cr_init(auth, cred);
616 rpcauth_destroy_credlist(&free);
620 EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache);
623 rpcauth_lookupcred(struct rpc_auth *auth, int flags)
625 struct auth_cred acred;
626 struct rpc_cred *ret;
627 const struct cred *cred = current_cred();
629 dprintk("RPC: looking up %s cred\n",
630 auth->au_ops->au_name);
632 memset(&acred, 0, sizeof(acred));
633 acred.uid = cred->fsuid;
634 acred.gid = cred->fsgid;
635 acred.group_info = cred->group_info;
636 ret = auth->au_ops->lookup_cred(auth, &acred, flags);
639 EXPORT_SYMBOL_GPL(rpcauth_lookupcred);
642 rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
643 struct rpc_auth *auth, const struct rpc_credops *ops)
645 INIT_HLIST_NODE(&cred->cr_hash);
646 INIT_LIST_HEAD(&cred->cr_lru);
647 atomic_set(&cred->cr_count, 1);
648 cred->cr_auth = auth;
650 cred->cr_expire = jiffies;
651 cred->cr_uid = acred->uid;
653 EXPORT_SYMBOL_GPL(rpcauth_init_cred);
656 rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags)
658 dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
659 cred->cr_auth->au_ops->au_name, cred);
660 return get_rpccred(cred);
662 EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred);
664 static struct rpc_cred *
665 rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
667 struct rpc_auth *auth = task->tk_client->cl_auth;
668 struct auth_cred acred = {
669 .uid = GLOBAL_ROOT_UID,
670 .gid = GLOBAL_ROOT_GID,
673 dprintk("RPC: %5u looking up %s cred\n",
674 task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
675 return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
678 static struct rpc_cred *
679 rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags)
681 struct rpc_auth *auth = task->tk_client->cl_auth;
683 dprintk("RPC: %5u looking up %s cred\n",
684 task->tk_pid, auth->au_ops->au_name);
685 return rpcauth_lookupcred(auth, lookupflags);
689 rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
691 struct rpc_rqst *req = task->tk_rqstp;
692 struct rpc_cred *new;
695 if (flags & RPC_TASK_ASYNC)
696 lookupflags |= RPCAUTH_LOOKUP_NEW;
698 new = cred->cr_ops->crbind(task, cred, lookupflags);
699 else if (flags & RPC_TASK_ROOTCREDS)
700 new = rpcauth_bind_root_cred(task, lookupflags);
702 new = rpcauth_bind_new_cred(task, lookupflags);
705 put_rpccred(req->rq_cred);
711 put_rpccred(struct rpc_cred *cred)
715 /* Fast path for unhashed credentials */
716 if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
717 if (atomic_dec_and_test(&cred->cr_count))
718 cred->cr_ops->crdestroy(cred);
722 if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
724 if (!list_empty(&cred->cr_lru)) {
725 number_cred_unused--;
726 list_del_init(&cred->cr_lru);
728 if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
729 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
730 cred->cr_expire = jiffies;
731 list_add_tail(&cred->cr_lru, &cred_unused);
732 number_cred_unused++;
735 if (!rpcauth_unhash_cred(cred)) {
736 /* We were hashed and someone looked us up... */
740 spin_unlock(&rpc_credcache_lock);
741 cred->cr_ops->crdestroy(cred);
744 spin_unlock(&rpc_credcache_lock);
746 EXPORT_SYMBOL_GPL(put_rpccred);
749 rpcauth_marshcred(struct rpc_task *task, __be32 *p)
751 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
753 dprintk("RPC: %5u marshaling %s cred %p\n",
754 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
756 return cred->cr_ops->crmarshal(task, p);
760 rpcauth_checkverf(struct rpc_task *task, __be32 *p)
762 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
764 dprintk("RPC: %5u validating %s cred %p\n",
765 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
767 return cred->cr_ops->crvalidate(task, p);
770 static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
771 __be32 *data, void *obj)
773 struct xdr_stream xdr;
775 xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
776 encode(rqstp, &xdr, obj);
780 rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
781 __be32 *data, void *obj)
783 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
785 dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
786 task->tk_pid, cred->cr_ops->cr_name, cred);
787 if (cred->cr_ops->crwrap_req)
788 return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
789 /* By default, we encode the arguments normally. */
790 rpcauth_wrap_req_encode(encode, rqstp, data, obj);
795 rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
796 __be32 *data, void *obj)
798 struct xdr_stream xdr;
800 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
801 return decode(rqstp, &xdr, obj);
805 rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
806 __be32 *data, void *obj)
808 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
810 dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
811 task->tk_pid, cred->cr_ops->cr_name, cred);
812 if (cred->cr_ops->crunwrap_resp)
813 return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
815 /* By default, we decode the arguments normally. */
816 return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
820 rpcauth_refreshcred(struct rpc_task *task)
822 struct rpc_cred *cred;
825 cred = task->tk_rqstp->rq_cred;
827 err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags);
830 cred = task->tk_rqstp->rq_cred;
832 dprintk("RPC: %5u refreshing %s cred %p\n",
833 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
835 err = cred->cr_ops->crrefresh(task);
838 task->tk_status = err;
843 rpcauth_invalcred(struct rpc_task *task)
845 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
847 dprintk("RPC: %5u invalidating %s cred %p\n",
848 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
850 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
854 rpcauth_uptodatecred(struct rpc_task *task)
856 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
858 return cred == NULL ||
859 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
862 static struct shrinker rpc_cred_shrinker = {
863 .count_objects = rpcauth_cache_shrink_count,
864 .scan_objects = rpcauth_cache_shrink_scan,
865 .seeks = DEFAULT_SEEKS,
868 int __init rpcauth_init_module(void)
872 err = rpc_init_authunix();
875 err = rpc_init_generic_auth();
878 err = register_shrinker(&rpc_cred_shrinker);
883 rpc_destroy_generic_auth();
885 rpc_destroy_authunix();
890 void rpcauth_remove_module(void)
892 rpc_destroy_authunix();
893 rpc_destroy_generic_auth();
894 unregister_shrinker(&rpc_cred_shrinker);