// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/net/sunrpc/auth.c
*
* Generic RPC client authentication API.
*
* Copyright (C) 1996, Olaf Kirch <[email protected]>
*/
#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,
[RPC_AUTH_TLS] = (const struct rpc_authops __force __rcu *)&authtls_ops,
};
static LIST_HEAD(cred_unused);
static unsigned long number_cred_unused;
static struct cred machine_cred = {
.usage = ATOMIC_INIT(1),
};
/*
* 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
*
* Return values:
* %0: Verifier is valid. @xdr now points past the verifier.
* %-EIO: Verifier is corrupted or message ended early.
* %-EACCES: Verifier is intact but not valid.
* %-EPROTONOSUPPORT: Server does not support the requested auth type.
*
* When a negative errno is returned, @xdr is left in an undefined
* state.
*/
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;
int __init rpcauth_init_module(void)
{
int err;
err = rpc_init_authunix();
if (err < 0)
goto out1;
rpc_cred_shrinker = shrinker_alloc(0, "sunrpc_cred");
if (!rpc_cred_shrinker) {
err = -ENOMEM;
goto out2;
}
rpc_cred_shrinker->count_objects = rpcauth_cache_shrink_count;
rpc_cred_shrinker->scan_objects = rpcauth_cache_shrink_scan;
shrinker_register(rpc_cred_shrinker);
return 0;
out2:
rpc_destroy_authunix();
out1:
return err;
}
void rpcauth_remove_module(void)
{
rpc_destroy_authunix();
shrinker_free(rpc_cred_shrinker);
}
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