v4.19.13 snapshot.
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
new file mode 100644
index 0000000..305ecea
--- /dev/null
+++ b/net/sunrpc/auth.c
@@ -0,0 +1,896 @@
+/*
+ * 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>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+#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 DEFINE_SPINLOCK(rpc_authflavor_lock);
+static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
+ &authnull_ops, /* AUTH_NULL */
+ &authunix_ops, /* AUTH_UNIX */
+ NULL, /* others can be loadable modules */
+};
+
+static LIST_HEAD(cred_unused);
+static unsigned long number_cred_unused;
+
+#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", 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)
+{
+ rpc_authflavor_t flavor;
+ int ret = -EPERM;
+
+ if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+ return -EINVAL;
+ spin_lock(&rpc_authflavor_lock);
+ if (auth_flavors[flavor] == NULL) {
+ auth_flavors[flavor] = ops;
+ ret = 0;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rpcauth_register);
+
+int
+rpcauth_unregister(const struct rpc_authops *ops)
+{
+ rpc_authflavor_t flavor;
+ int ret = -EPERM;
+
+ if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+ return -EINVAL;
+ spin_lock(&rpc_authflavor_lock);
+ if (auth_flavors[flavor] == ops) {
+ auth_flavors[flavor] = NULL;
+ ret = 0;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rpcauth_unregister);
+
+/**
+ * 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;
+ rpc_authflavor_t pseudoflavor;
+
+ ops = auth_flavors[flavor];
+ if (ops == NULL)
+ request_module("rpc-auth-%u", flavor);
+ spin_lock(&rpc_authflavor_lock);
+ ops = auth_flavors[flavor];
+ if (ops == NULL || !try_module_get(ops->owner)) {
+ spin_unlock(&rpc_authflavor_lock);
+ return RPC_AUTH_MAXFLAVOR;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+
+ pseudoflavor = flavor;
+ if (ops->info2flavor != NULL)
+ pseudoflavor = ops->info2flavor(info);
+
+ module_put(ops->owner);
+ 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;
+
+ if (flavor >= RPC_AUTH_MAXFLAVOR)
+ return -EINVAL;
+
+ ops = auth_flavors[flavor];
+ if (ops == NULL)
+ request_module("rpc-auth-%u", flavor);
+ spin_lock(&rpc_authflavor_lock);
+ ops = auth_flavors[flavor];
+ if (ops == NULL || !try_module_get(ops->owner)) {
+ spin_unlock(&rpc_authflavor_lock);
+ return -ENOENT;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+
+ result = -ENOENT;
+ if (ops->flavor2info != NULL)
+ result = ops->flavor2info(pseudoflavor, info);
+
+ module_put(ops->owner);
+ return result;
+}
+EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo);
+
+/**
+ * rpcauth_list_flavors - discover registered flavors and pseudoflavors
+ * @array: array to fill in
+ * @size: size of "array"
+ *
+ * Returns the number of array items filled in, or a negative errno.
+ *
+ * The returned array is not sorted by any policy. Callers should not
+ * rely on the order of the items in the returned array.
+ */
+int
+rpcauth_list_flavors(rpc_authflavor_t *array, int size)
+{
+ rpc_authflavor_t flavor;
+ int result = 0;
+
+ spin_lock(&rpc_authflavor_lock);
+ for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) {
+ const struct rpc_authops *ops = auth_flavors[flavor];
+ rpc_authflavor_t pseudos[4];
+ int i, len;
+
+ if (result >= size) {
+ result = -ENOMEM;
+ break;
+ }
+
+ if (ops == NULL)
+ continue;
+ if (ops->list_pseudoflavors == NULL) {
+ array[result++] = ops->au_flavor;
+ continue;
+ }
+ len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos));
+ if (len < 0) {
+ result = len;
+ break;
+ }
+ for (i = 0; i < len; i++) {
+ if (result >= size) {
+ result = -ENOMEM;
+ break;
+ }
+ array[result++] = pseudos[i];
+ }
+ }
+ spin_unlock(&rpc_authflavor_lock);
+
+ dprintk("RPC: %s returns %d\n", __func__, result);
+ return result;
+}
+EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
+
+struct rpc_auth *
+rpcauth_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+ struct rpc_auth *auth;
+ const struct rpc_authops *ops;
+ u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor);
+
+ auth = ERR_PTR(-EINVAL);
+ if (flavor >= RPC_AUTH_MAXFLAVOR)
+ goto out;
+
+ if ((ops = auth_flavors[flavor]) == NULL)
+ request_module("rpc-auth-%u", flavor);
+ spin_lock(&rpc_authflavor_lock);
+ ops = auth_flavors[flavor];
+ if (ops == NULL || !try_module_get(ops->owner)) {
+ spin_unlock(&rpc_authflavor_lock);
+ goto out;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+ auth = ops->create(args, clnt);
+ module_put(ops->owner);
+ 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 (!atomic_dec_and_test(&auth->au_count))
+ return;
+ auth->au_ops->destroy(auth);
+}
+
+static DEFINE_SPINLOCK(rpc_credcache_lock);
+
+static void
+rpcauth_unhash_cred_locked(struct rpc_cred *cred)
+{
+ hlist_del_rcu(&cred->cr_hash);
+ smp_mb__before_atomic();
+ clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
+}
+
+static int
+rpcauth_unhash_cred(struct rpc_cred *cred)
+{
+ spinlock_t *cache_lock;
+ int ret;
+
+ cache_lock = &cred->cr_auth->au_credcache->lock;
+ spin_lock(cache_lock);
+ ret = atomic_read(&cred->cr_count) == 0;
+ if (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);
+
+/*
+ * Setup a credential key lifetime timeout notification
+ */
+int
+rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+ if (!cred->cr_auth->au_ops->key_timeout)
+ return 0;
+ return cred->cr_auth->au_ops->key_timeout(auth, cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
+
+bool
+rpcauth_cred_key_to_expire(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+ if (auth->au_flags & RPCAUTH_AUTH_NO_CRKEY_TIMEOUT)
+ return false;
+ if (!cred->cr_ops->crkey_to_expire)
+ return false;
+ return cred->cr_ops->crkey_to_expire(cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
+
+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);
+ }
+}
+
+/*
+ * 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);
+ get_rpccred(cred);
+ if (!list_empty(&cred->cr_lru)) {
+ list_del(&cred->cr_lru);
+ number_cred_unused--;
+ }
+ list_add_tail(&cred->cr_lru, &free);
+ rpcauth_unhash_cred_locked(cred);
+ }
+ }
+ 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)
+{
+ spinlock_t *cache_lock;
+ 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;
+ /*
+ * 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) &&
+ test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
+ freed = SHRINK_STOP;
+ break;
+ }
+
+ list_del_init(&cred->cr_lru);
+ number_cred_unused--;
+ freed++;
+ if (atomic_read(&cred->cr_count) != 0)
+ continue;
+
+ cache_lock = &cred->cr_auth->au_credcache->lock;
+ spin_lock(cache_lock);
+ if (atomic_read(&cred->cr_count) == 0) {
+ get_rpccred(cred);
+ list_add_tail(&cred->cr_lru, free);
+ rpcauth_unhash_cred_locked(cred);
+ }
+ spin_unlock(cache_lock);
+ }
+ return freed;
+}
+
+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;
+ if (flags & RPCAUTH_LOOKUP_RCU) {
+ if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) &&
+ !test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags))
+ cred = entry;
+ break;
+ }
+ spin_lock(&cache->lock);
+ if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
+ spin_unlock(&cache->lock);
+ continue;
+ }
+ cred = get_rpccred(entry);
+ spin_unlock(&cache->lock);
+ break;
+ }
+ rcu_read_unlock();
+
+ if (cred != NULL)
+ goto found;
+
+ if (flags & RPCAUTH_LOOKUP_RCU)
+ return ERR_PTR(-ECHILD);
+
+ 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);
+ break;
+ }
+ if (cred == NULL) {
+ cred = new;
+ set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
+ 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();
+
+ dprintk("RPC: looking up %s cred\n",
+ auth->au_ops->au_name);
+
+ memset(&acred, 0, sizeof(acred));
+ acred.uid = cred->fsuid;
+ acred.gid = cred->fsgid;
+ acred.group_info = cred->group_info;
+ 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);
+ atomic_set(&cred->cr_count, 1);
+ cred->cr_auth = auth;
+ cred->cr_ops = ops;
+ cred->cr_expire = jiffies;
+ cred->cr_uid = acred->uid;
+}
+EXPORT_SYMBOL_GPL(rpcauth_init_cred);
+
+struct rpc_cred *
+rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags)
+{
+ dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
+ cred->cr_auth->au_ops->au_name, cred);
+ return get_rpccred(cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_generic_bind_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 = {
+ .uid = GLOBAL_ROOT_UID,
+ .gid = GLOBAL_ROOT_GID,
+ };
+
+ dprintk("RPC: %5u looking up %s cred\n",
+ task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
+ 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;
+
+ dprintk("RPC: %5u looking up %s cred\n",
+ task->tk_pid, auth->au_ops->au_name);
+ return rpcauth_lookupcred(auth, lookupflags);
+}
+
+static int
+rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_cred *new;
+ int lookupflags = 0;
+
+ if (flags & RPC_TASK_ASYNC)
+ lookupflags |= RPCAUTH_LOOKUP_NEW;
+ if (cred != NULL)
+ new = cred->cr_ops->crbind(task, cred, lookupflags);
+ else if (flags & RPC_TASK_ROOTCREDS)
+ new = rpcauth_bind_root_cred(task, lookupflags);
+ 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;
+ /* Fast path for unhashed credentials */
+ if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
+ if (atomic_dec_and_test(&cred->cr_count))
+ cred->cr_ops->crdestroy(cred);
+ return;
+ }
+
+ if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
+ return;
+ if (!list_empty(&cred->cr_lru)) {
+ number_cred_unused--;
+ list_del_init(&cred->cr_lru);
+ }
+ if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
+ if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
+ cred->cr_expire = jiffies;
+ list_add_tail(&cred->cr_lru, &cred_unused);
+ number_cred_unused++;
+ goto out_nodestroy;
+ }
+ if (!rpcauth_unhash_cred(cred)) {
+ /* We were hashed and someone looked us up... */
+ goto out_nodestroy;
+ }
+ }
+ spin_unlock(&rpc_credcache_lock);
+ cred->cr_ops->crdestroy(cred);
+ return;
+out_nodestroy:
+ spin_unlock(&rpc_credcache_lock);
+}
+EXPORT_SYMBOL_GPL(put_rpccred);
+
+__be32 *
+rpcauth_marshcred(struct rpc_task *task, __be32 *p)
+{
+ struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+ dprintk("RPC: %5u marshaling %s cred %p\n",
+ task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+
+ return cred->cr_ops->crmarshal(task, p);
+}
+
+__be32 *
+rpcauth_checkverf(struct rpc_task *task, __be32 *p)
+{
+ struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+ dprintk("RPC: %5u validating %s cred %p\n",
+ task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+
+ return cred->cr_ops->crvalidate(task, p);
+}
+
+static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
+ __be32 *data, void *obj)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
+ encode(rqstp, &xdr, obj);
+}
+
+int
+rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
+ __be32 *data, void *obj)
+{
+ struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+ dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
+ task->tk_pid, cred->cr_ops->cr_name, cred);
+ if (cred->cr_ops->crwrap_req)
+ return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
+ /* By default, we encode the arguments normally. */
+ rpcauth_wrap_req_encode(encode, rqstp, data, obj);
+ return 0;
+}
+
+static int
+rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
+ __be32 *data, void *obj)
+{
+ struct xdr_stream xdr;
+
+ xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
+ return decode(rqstp, &xdr, obj);
+}
+
+int
+rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
+ __be32 *data, void *obj)
+{
+ struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+ dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
+ task->tk_pid, cred->cr_ops->cr_name, cred);
+ if (cred->cr_ops->crunwrap_resp)
+ return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
+ data, obj);
+ /* By default, we decode the arguments normally. */
+ return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
+}
+
+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;
+ }
+ dprintk("RPC: %5u refreshing %s cred %p\n",
+ task->tk_pid, cred->cr_auth->au_ops->au_name, 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;
+
+ dprintk("RPC: %5u invalidating %s cred %p\n",
+ task->tk_pid, cred->cr_auth->au_ops->au_name, 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 = rpc_init_generic_auth();
+ if (err < 0)
+ goto out2;
+ err = register_shrinker(&rpc_cred_shrinker);
+ if (err < 0)
+ goto out3;
+ return 0;
+out3:
+ rpc_destroy_generic_auth();
+out2:
+ rpc_destroy_authunix();
+out1:
+ return err;
+}
+
+void rpcauth_remove_module(void)
+{
+ rpc_destroy_authunix();
+ rpc_destroy_generic_auth();
+ unregister_shrinker(&rpc_cred_shrinker);
+}