diff options
Diffstat (limited to 'net/sunrpc/auth.c')
| -rw-r--r-- | net/sunrpc/auth.c | 891 |
1 files changed, 891 insertions, 0 deletions
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c new file mode 100644 index 000000000..fb75a8835 --- /dev/null +++ b/net/sunrpc/auth.c @@ -0,0 +1,891 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/net/sunrpc/auth.c + * + * Generic RPC client authentication API. + * + * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/cred.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/hash.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/gss_api.h> +#include <linux/spinlock.h> + +#include <trace/events/sunrpc.h> + +#define RPC_CREDCACHE_DEFAULT_HASHBITS (4) +struct rpc_cred_cache { + struct hlist_head *hashtable; + unsigned int hashbits; + spinlock_t lock; +}; + +static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS; + +static const struct rpc_authops __rcu *auth_flavors[RPC_AUTH_MAXFLAVOR] = { + [RPC_AUTH_NULL] = (const struct rpc_authops __force __rcu *)&authnull_ops, + [RPC_AUTH_UNIX] = (const struct rpc_authops __force __rcu *)&authunix_ops, + NULL, /* others can be loadable modules */ +}; + +static LIST_HEAD(cred_unused); +static unsigned long number_cred_unused; + +static struct cred machine_cred = { + .usage = ATOMIC_INIT(1), +#ifdef CONFIG_DEBUG_CREDENTIALS + .magic = CRED_MAGIC, +#endif +}; + +/* + * Return the machine_cred pointer to be used whenever + * the a generic machine credential is needed. + */ +const struct cred *rpc_machine_cred(void) +{ + return &machine_cred; +} +EXPORT_SYMBOL_GPL(rpc_machine_cred); + +#define MAX_HASHTABLE_BITS (14) +static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp) +{ + unsigned long num; + unsigned int nbits; + int ret; + + if (!val) + goto out_inval; + ret = kstrtoul(val, 0, &num); + if (ret) + goto out_inval; + nbits = fls(num - 1); + if (nbits > MAX_HASHTABLE_BITS || nbits < 2) + goto out_inval; + *(unsigned int *)kp->arg = nbits; + return 0; +out_inval: + return -EINVAL; +} + +static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp) +{ + unsigned int nbits; + + nbits = *(unsigned int *)kp->arg; + return sprintf(buffer, "%u\n", 1U << nbits); +} + +#define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int); + +static const struct kernel_param_ops param_ops_hashtbl_sz = { + .set = param_set_hashtbl_sz, + .get = param_get_hashtbl_sz, +}; + +module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); +MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); + +static unsigned long auth_max_cred_cachesize = ULONG_MAX; +module_param(auth_max_cred_cachesize, ulong, 0644); +MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size"); + +static u32 +pseudoflavor_to_flavor(u32 flavor) { + if (flavor > RPC_AUTH_MAXFLAVOR) + return RPC_AUTH_GSS; + return flavor; +} + +int +rpcauth_register(const struct rpc_authops *ops) +{ + const struct rpc_authops *old; + rpc_authflavor_t flavor; + + if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) + return -EINVAL; + old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], NULL, ops); + if (old == NULL || old == ops) + return 0; + return -EPERM; +} +EXPORT_SYMBOL_GPL(rpcauth_register); + +int +rpcauth_unregister(const struct rpc_authops *ops) +{ + const struct rpc_authops *old; + rpc_authflavor_t flavor; + + if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) + return -EINVAL; + + old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], ops, NULL); + if (old == ops || old == NULL) + return 0; + return -EPERM; +} +EXPORT_SYMBOL_GPL(rpcauth_unregister); + +static const struct rpc_authops * +rpcauth_get_authops(rpc_authflavor_t flavor) +{ + const struct rpc_authops *ops; + + if (flavor >= RPC_AUTH_MAXFLAVOR) + return NULL; + + rcu_read_lock(); + ops = rcu_dereference(auth_flavors[flavor]); + if (ops == NULL) { + rcu_read_unlock(); + request_module("rpc-auth-%u", flavor); + rcu_read_lock(); + ops = rcu_dereference(auth_flavors[flavor]); + if (ops == NULL) + goto out; + } + if (!try_module_get(ops->owner)) + ops = NULL; +out: + rcu_read_unlock(); + return ops; +} + +static void +rpcauth_put_authops(const struct rpc_authops *ops) +{ + module_put(ops->owner); +} + +/** + * rpcauth_get_pseudoflavor - check if security flavor is supported + * @flavor: a security flavor + * @info: a GSS mech OID, quality of protection, and service value + * + * Verifies that an appropriate kernel module is available or already loaded. + * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is + * not supported locally. + */ +rpc_authflavor_t +rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info) +{ + const struct rpc_authops *ops = rpcauth_get_authops(flavor); + rpc_authflavor_t pseudoflavor; + + if (!ops) + return RPC_AUTH_MAXFLAVOR; + pseudoflavor = flavor; + if (ops->info2flavor != NULL) + pseudoflavor = ops->info2flavor(info); + + rpcauth_put_authops(ops); + return pseudoflavor; +} +EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor); + +/** + * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor + * @pseudoflavor: GSS pseudoflavor to match + * @info: rpcsec_gss_info structure to fill in + * + * Returns zero and fills in "info" if pseudoflavor matches a + * supported mechanism. + */ +int +rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info) +{ + rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor); + const struct rpc_authops *ops; + int result; + + ops = rpcauth_get_authops(flavor); + if (ops == NULL) + return -ENOENT; + + result = -ENOENT; + if (ops->flavor2info != NULL) + result = ops->flavor2info(pseudoflavor, info); + + rpcauth_put_authops(ops); + return result; +} +EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); + +struct rpc_auth * +rpcauth_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) +{ + struct rpc_auth *auth = ERR_PTR(-EINVAL); + const struct rpc_authops *ops; + u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); + + ops = rpcauth_get_authops(flavor); + if (ops == NULL) + goto out; + + auth = ops->create(args, clnt); + + rpcauth_put_authops(ops); + if (IS_ERR(auth)) + return auth; + if (clnt->cl_auth) + rpcauth_release(clnt->cl_auth); + clnt->cl_auth = auth; + +out: + return auth; +} +EXPORT_SYMBOL_GPL(rpcauth_create); + +void +rpcauth_release(struct rpc_auth *auth) +{ + if (!refcount_dec_and_test(&auth->au_count)) + return; + auth->au_ops->destroy(auth); +} + +static DEFINE_SPINLOCK(rpc_credcache_lock); + +/* + * On success, the caller is responsible for freeing the reference + * held by the hashtable + */ +static bool +rpcauth_unhash_cred_locked(struct rpc_cred *cred) +{ + if (!test_and_clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) + return false; + hlist_del_rcu(&cred->cr_hash); + return true; +} + +static bool +rpcauth_unhash_cred(struct rpc_cred *cred) +{ + spinlock_t *cache_lock; + bool ret; + + if (!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) + return false; + cache_lock = &cred->cr_auth->au_credcache->lock; + spin_lock(cache_lock); + ret = rpcauth_unhash_cred_locked(cred); + spin_unlock(cache_lock); + return ret; +} + +/* + * Initialize RPC credential cache + */ +int +rpcauth_init_credcache(struct rpc_auth *auth) +{ + struct rpc_cred_cache *new; + unsigned int hashsize; + + new = kmalloc(sizeof(*new), GFP_KERNEL); + if (!new) + goto out_nocache; + new->hashbits = auth_hashbits; + hashsize = 1U << new->hashbits; + new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL); + if (!new->hashtable) + goto out_nohashtbl; + spin_lock_init(&new->lock); + auth->au_credcache = new; + return 0; +out_nohashtbl: + kfree(new); +out_nocache: + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(rpcauth_init_credcache); + +char * +rpcauth_stringify_acceptor(struct rpc_cred *cred) +{ + if (!cred->cr_ops->crstringify_acceptor) + return NULL; + return cred->cr_ops->crstringify_acceptor(cred); +} +EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor); + +/* + * Destroy a list of credentials + */ +static inline +void rpcauth_destroy_credlist(struct list_head *head) +{ + struct rpc_cred *cred; + + while (!list_empty(head)) { + cred = list_entry(head->next, struct rpc_cred, cr_lru); + list_del_init(&cred->cr_lru); + put_rpccred(cred); + } +} + +static void +rpcauth_lru_add_locked(struct rpc_cred *cred) +{ + if (!list_empty(&cred->cr_lru)) + return; + number_cred_unused++; + list_add_tail(&cred->cr_lru, &cred_unused); +} + +static void +rpcauth_lru_add(struct rpc_cred *cred) +{ + if (!list_empty(&cred->cr_lru)) + return; + spin_lock(&rpc_credcache_lock); + rpcauth_lru_add_locked(cred); + spin_unlock(&rpc_credcache_lock); +} + +static void +rpcauth_lru_remove_locked(struct rpc_cred *cred) +{ + if (list_empty(&cred->cr_lru)) + return; + number_cred_unused--; + list_del_init(&cred->cr_lru); +} + +static void +rpcauth_lru_remove(struct rpc_cred *cred) +{ + if (list_empty(&cred->cr_lru)) + return; + spin_lock(&rpc_credcache_lock); + rpcauth_lru_remove_locked(cred); + spin_unlock(&rpc_credcache_lock); +} + +/* + * Clear the RPC credential cache, and delete those credentials + * that are not referenced. + */ +void +rpcauth_clear_credcache(struct rpc_cred_cache *cache) +{ + LIST_HEAD(free); + struct hlist_head *head; + struct rpc_cred *cred; + unsigned int hashsize = 1U << cache->hashbits; + int i; + + spin_lock(&rpc_credcache_lock); + spin_lock(&cache->lock); + for (i = 0; i < hashsize; i++) { + head = &cache->hashtable[i]; + while (!hlist_empty(head)) { + cred = hlist_entry(head->first, struct rpc_cred, cr_hash); + rpcauth_unhash_cred_locked(cred); + /* Note: We now hold a reference to cred */ + rpcauth_lru_remove_locked(cred); + list_add_tail(&cred->cr_lru, &free); + } + } + spin_unlock(&cache->lock); + spin_unlock(&rpc_credcache_lock); + rpcauth_destroy_credlist(&free); +} + +/* + * Destroy the RPC credential cache + */ +void +rpcauth_destroy_credcache(struct rpc_auth *auth) +{ + struct rpc_cred_cache *cache = auth->au_credcache; + + if (cache) { + auth->au_credcache = NULL; + rpcauth_clear_credcache(cache); + kfree(cache->hashtable); + kfree(cache); + } +} +EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); + + +#define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) + +/* + * Remove stale credentials. Avoid sleeping inside the loop. + */ +static long +rpcauth_prune_expired(struct list_head *free, int nr_to_scan) +{ + struct rpc_cred *cred, *next; + unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; + long freed = 0; + + list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { + + if (nr_to_scan-- == 0) + break; + if (refcount_read(&cred->cr_count) > 1) { + rpcauth_lru_remove_locked(cred); + continue; + } + /* + * Enforce a 60 second garbage collection moratorium + * Note that the cred_unused list must be time-ordered. + */ + if (time_in_range(cred->cr_expire, expired, jiffies)) + continue; + if (!rpcauth_unhash_cred(cred)) + continue; + + rpcauth_lru_remove_locked(cred); + freed++; + list_add_tail(&cred->cr_lru, free); + } + return freed ? freed : SHRINK_STOP; +} + +static unsigned long +rpcauth_cache_do_shrink(int nr_to_scan) +{ + LIST_HEAD(free); + unsigned long freed; + + spin_lock(&rpc_credcache_lock); + freed = rpcauth_prune_expired(&free, nr_to_scan); + spin_unlock(&rpc_credcache_lock); + rpcauth_destroy_credlist(&free); + + return freed; +} + +/* + * Run memory cache shrinker. + */ +static unsigned long +rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) + +{ + if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) + return SHRINK_STOP; + + /* nothing left, don't come back */ + if (list_empty(&cred_unused)) + return SHRINK_STOP; + + return rpcauth_cache_do_shrink(sc->nr_to_scan); +} + +static unsigned long +rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) + +{ + return number_cred_unused * sysctl_vfs_cache_pressure / 100; +} + +static void +rpcauth_cache_enforce_limit(void) +{ + unsigned long diff; + unsigned int nr_to_scan; + + if (number_cred_unused <= auth_max_cred_cachesize) + return; + diff = number_cred_unused - auth_max_cred_cachesize; + nr_to_scan = 100; + if (diff < nr_to_scan) + nr_to_scan = diff; + rpcauth_cache_do_shrink(nr_to_scan); +} + +/* + * Look up a process' credentials in the authentication cache + */ +struct rpc_cred * +rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, + int flags, gfp_t gfp) +{ + LIST_HEAD(free); + struct rpc_cred_cache *cache = auth->au_credcache; + struct rpc_cred *cred = NULL, + *entry, *new; + unsigned int nr; + + nr = auth->au_ops->hash_cred(acred, cache->hashbits); + + rcu_read_lock(); + hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) { + if (!entry->cr_ops->crmatch(acred, entry, flags)) + continue; + cred = get_rpccred(entry); + if (cred) + break; + } + rcu_read_unlock(); + + if (cred != NULL) + goto found; + + new = auth->au_ops->crcreate(auth, acred, flags, gfp); + if (IS_ERR(new)) { + cred = new; + goto out; + } + + spin_lock(&cache->lock); + hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) { + if (!entry->cr_ops->crmatch(acred, entry, flags)) + continue; + cred = get_rpccred(entry); + if (cred) + break; + } + if (cred == NULL) { + cred = new; + set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); + refcount_inc(&cred->cr_count); + hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]); + } else + list_add_tail(&new->cr_lru, &free); + spin_unlock(&cache->lock); + rpcauth_cache_enforce_limit(); +found: + if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && + cred->cr_ops->cr_init != NULL && + !(flags & RPCAUTH_LOOKUP_NEW)) { + int res = cred->cr_ops->cr_init(auth, cred); + if (res < 0) { + put_rpccred(cred); + cred = ERR_PTR(res); + } + } + rpcauth_destroy_credlist(&free); +out: + return cred; +} +EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache); + +struct rpc_cred * +rpcauth_lookupcred(struct rpc_auth *auth, int flags) +{ + struct auth_cred acred; + struct rpc_cred *ret; + const struct cred *cred = current_cred(); + + memset(&acred, 0, sizeof(acred)); + acred.cred = cred; + ret = auth->au_ops->lookup_cred(auth, &acred, flags); + return ret; +} +EXPORT_SYMBOL_GPL(rpcauth_lookupcred); + +void +rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, + struct rpc_auth *auth, const struct rpc_credops *ops) +{ + INIT_HLIST_NODE(&cred->cr_hash); + INIT_LIST_HEAD(&cred->cr_lru); + refcount_set(&cred->cr_count, 1); + cred->cr_auth = auth; + cred->cr_flags = 0; + cred->cr_ops = ops; + cred->cr_expire = jiffies; + cred->cr_cred = get_cred(acred->cred); +} +EXPORT_SYMBOL_GPL(rpcauth_init_cred); + +static struct rpc_cred * +rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags) +{ + struct rpc_auth *auth = task->tk_client->cl_auth; + struct auth_cred acred = { + .cred = get_task_cred(&init_task), + }; + struct rpc_cred *ret; + + if (RPC_IS_ASYNC(task)) + lookupflags |= RPCAUTH_LOOKUP_ASYNC; + ret = auth->au_ops->lookup_cred(auth, &acred, lookupflags); + put_cred(acred.cred); + return ret; +} + +static struct rpc_cred * +rpcauth_bind_machine_cred(struct rpc_task *task, int lookupflags) +{ + struct rpc_auth *auth = task->tk_client->cl_auth; + struct auth_cred acred = { + .principal = task->tk_client->cl_principal, + .cred = init_task.cred, + }; + + if (!acred.principal) + return NULL; + if (RPC_IS_ASYNC(task)) + lookupflags |= RPCAUTH_LOOKUP_ASYNC; + return auth->au_ops->lookup_cred(auth, &acred, lookupflags); +} + +static struct rpc_cred * +rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags) +{ + struct rpc_auth *auth = task->tk_client->cl_auth; + + return rpcauth_lookupcred(auth, lookupflags); +} + +static int +rpcauth_bindcred(struct rpc_task *task, const struct cred *cred, int flags) +{ + struct rpc_rqst *req = task->tk_rqstp; + struct rpc_cred *new = NULL; + int lookupflags = 0; + struct rpc_auth *auth = task->tk_client->cl_auth; + struct auth_cred acred = { + .cred = cred, + }; + + if (flags & RPC_TASK_ASYNC) + lookupflags |= RPCAUTH_LOOKUP_NEW | RPCAUTH_LOOKUP_ASYNC; + if (task->tk_op_cred) + /* Task must use exactly this rpc_cred */ + new = get_rpccred(task->tk_op_cred); + else if (cred != NULL && cred != &machine_cred) + new = auth->au_ops->lookup_cred(auth, &acred, lookupflags); + else if (cred == &machine_cred) + new = rpcauth_bind_machine_cred(task, lookupflags); + + /* If machine cred couldn't be bound, try a root cred */ + if (new) + ; + else if (cred == &machine_cred) + new = rpcauth_bind_root_cred(task, lookupflags); + else if (flags & RPC_TASK_NULLCREDS) + new = authnull_ops.lookup_cred(NULL, NULL, 0); + else + new = rpcauth_bind_new_cred(task, lookupflags); + if (IS_ERR(new)) + return PTR_ERR(new); + put_rpccred(req->rq_cred); + req->rq_cred = new; + return 0; +} + +void +put_rpccred(struct rpc_cred *cred) +{ + if (cred == NULL) + return; + rcu_read_lock(); + if (refcount_dec_and_test(&cred->cr_count)) + goto destroy; + if (refcount_read(&cred->cr_count) != 1 || + !test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) + goto out; + if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) { + cred->cr_expire = jiffies; + rpcauth_lru_add(cred); + /* Race breaker */ + if (unlikely(!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags))) + rpcauth_lru_remove(cred); + } else if (rpcauth_unhash_cred(cred)) { + rpcauth_lru_remove(cred); + if (refcount_dec_and_test(&cred->cr_count)) + goto destroy; + } +out: + rcu_read_unlock(); + return; +destroy: + rcu_read_unlock(); + cred->cr_ops->crdestroy(cred); +} +EXPORT_SYMBOL_GPL(put_rpccred); + +/** + * rpcauth_marshcred - Append RPC credential to end of @xdr + * @task: controlling RPC task + * @xdr: xdr_stream containing initial portion of RPC Call header + * + * On success, an appropriate verifier is added to @xdr, @xdr is + * updated to point past the verifier, and zero is returned. + * Otherwise, @xdr is in an undefined state and a negative errno + * is returned. + */ +int rpcauth_marshcred(struct rpc_task *task, struct xdr_stream *xdr) +{ + const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; + + return ops->crmarshal(task, xdr); +} + +/** + * rpcauth_wrap_req_encode - XDR encode the RPC procedure + * @task: controlling RPC task + * @xdr: stream where on-the-wire bytes are to be marshalled + * + * On success, @xdr contains the encoded and wrapped message. + * Otherwise, @xdr is in an undefined state. + */ +int rpcauth_wrap_req_encode(struct rpc_task *task, struct xdr_stream *xdr) +{ + kxdreproc_t encode = task->tk_msg.rpc_proc->p_encode; + + encode(task->tk_rqstp, xdr, task->tk_msg.rpc_argp); + return 0; +} +EXPORT_SYMBOL_GPL(rpcauth_wrap_req_encode); + +/** + * rpcauth_wrap_req - XDR encode and wrap the RPC procedure + * @task: controlling RPC task + * @xdr: stream where on-the-wire bytes are to be marshalled + * + * On success, @xdr contains the encoded and wrapped message, + * and zero is returned. Otherwise, @xdr is in an undefined + * state and a negative errno is returned. + */ +int rpcauth_wrap_req(struct rpc_task *task, struct xdr_stream *xdr) +{ + const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; + + return ops->crwrap_req(task, xdr); +} + +/** + * rpcauth_checkverf - Validate verifier in RPC Reply header + * @task: controlling RPC task + * @xdr: xdr_stream containing RPC Reply header + * + * On success, @xdr is updated to point past the verifier and + * zero is returned. Otherwise, @xdr is in an undefined state + * and a negative errno is returned. + */ +int +rpcauth_checkverf(struct rpc_task *task, struct xdr_stream *xdr) +{ + const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; + + return ops->crvalidate(task, xdr); +} + +/** + * rpcauth_unwrap_resp_decode - Invoke XDR decode function + * @task: controlling RPC task + * @xdr: stream where the Reply message resides + * + * Returns zero on success; otherwise a negative errno is returned. + */ +int +rpcauth_unwrap_resp_decode(struct rpc_task *task, struct xdr_stream *xdr) +{ + kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; + + return decode(task->tk_rqstp, xdr, task->tk_msg.rpc_resp); +} +EXPORT_SYMBOL_GPL(rpcauth_unwrap_resp_decode); + +/** + * rpcauth_unwrap_resp - Invoke unwrap and decode function for the cred + * @task: controlling RPC task + * @xdr: stream where the Reply message resides + * + * Returns zero on success; otherwise a negative errno is returned. + */ +int +rpcauth_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr) +{ + const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; + + return ops->crunwrap_resp(task, xdr); +} + +bool +rpcauth_xmit_need_reencode(struct rpc_task *task) +{ + struct rpc_cred *cred = task->tk_rqstp->rq_cred; + + if (!cred || !cred->cr_ops->crneed_reencode) + return false; + return cred->cr_ops->crneed_reencode(task); +} + +int +rpcauth_refreshcred(struct rpc_task *task) +{ + struct rpc_cred *cred; + int err; + + cred = task->tk_rqstp->rq_cred; + if (cred == NULL) { + err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags); + if (err < 0) + goto out; + cred = task->tk_rqstp->rq_cred; + } + + err = cred->cr_ops->crrefresh(task); +out: + if (err < 0) + task->tk_status = err; + return err; +} + +void +rpcauth_invalcred(struct rpc_task *task) +{ + struct rpc_cred *cred = task->tk_rqstp->rq_cred; + + if (cred) + clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); +} + +int +rpcauth_uptodatecred(struct rpc_task *task) +{ + struct rpc_cred *cred = task->tk_rqstp->rq_cred; + + return cred == NULL || + test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0; +} + +static struct shrinker rpc_cred_shrinker = { + .count_objects = rpcauth_cache_shrink_count, + .scan_objects = rpcauth_cache_shrink_scan, + .seeks = DEFAULT_SEEKS, +}; + +int __init rpcauth_init_module(void) +{ + int err; + + err = rpc_init_authunix(); + if (err < 0) + goto out1; + err = register_shrinker(&rpc_cred_shrinker, "sunrpc_cred"); + if (err < 0) + goto out2; + return 0; +out2: + rpc_destroy_authunix(); +out1: + return err; +} + +void rpcauth_remove_module(void) +{ + rpc_destroy_authunix(); + unregister_shrinker(&rpc_cred_shrinker); +} |