Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / sunrpc / svcauth.c

diff --git a/kernel/net/sunrpc/svcauth.c b/kernel/net/sunrpc/svcauth.c
new file mode 100644 (file)
index 0000000..79c0f34
--- /dev/null
+++ b/kernel/net/sunrpc/svcauth.c
@@ -0,0 +1,166 @@
+/*
+ * linux/net/sunrpc/svcauth.c
+ *
+ * The generic interface for RPC authentication on the server side.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ *
+ * CHANGES
+ * 19-Apr-2000 Chris Evans      - Security fix
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/err.h>
+#include <linux/hash.h>
+
+#define RPCDBG_FACILITY        RPCDBG_AUTH
+
+
+/*
+ * Table of authenticators
+ */
+extern struct auth_ops svcauth_null;
+extern struct auth_ops svcauth_unix;
+
+static DEFINE_SPINLOCK(authtab_lock);
+static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = {
+       [0] = &svcauth_null,
+       [1] = &svcauth_unix,
+};
+
+int
+svc_authenticate(struct svc_rqst *rqstp, __be32 *authp)
+{
+       rpc_authflavor_t        flavor;
+       struct auth_ops         *aops;
+
+       *authp = rpc_auth_ok;
+
+       flavor = svc_getnl(&rqstp->rq_arg.head[0]);
+
+       dprintk("svc: svc_authenticate (%d)\n", flavor);
+
+       spin_lock(&authtab_lock);
+       if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor]) ||
+           !try_module_get(aops->owner)) {
+               spin_unlock(&authtab_lock);
+               *authp = rpc_autherr_badcred;
+               return SVC_DENIED;
+       }
+       spin_unlock(&authtab_lock);
+
+       rqstp->rq_auth_slack = 0;
+
+       rqstp->rq_authop = aops;
+       return aops->accept(rqstp, authp);
+}
+EXPORT_SYMBOL_GPL(svc_authenticate);
+
+int svc_set_client(struct svc_rqst *rqstp)
+{
+       return rqstp->rq_authop->set_client(rqstp);
+}
+EXPORT_SYMBOL_GPL(svc_set_client);
+
+/* A request, which was authenticated, has now executed.
+ * Time to finalise the credentials and verifier
+ * and release and resources
+ */
+int svc_authorise(struct svc_rqst *rqstp)
+{
+       struct auth_ops *aops = rqstp->rq_authop;
+       int rv = 0;
+
+       rqstp->rq_authop = NULL;
+
+       if (aops) {
+               rv = aops->release(rqstp);
+               module_put(aops->owner);
+       }
+       return rv;
+}
+
+int
+svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
+{
+       int rv = -EINVAL;
+       spin_lock(&authtab_lock);
+       if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
+               authtab[flavor] = aops;
+               rv = 0;
+       }
+       spin_unlock(&authtab_lock);
+       return rv;
+}
+EXPORT_SYMBOL_GPL(svc_auth_register);
+
+void
+svc_auth_unregister(rpc_authflavor_t flavor)
+{
+       spin_lock(&authtab_lock);
+       if (flavor < RPC_AUTH_MAXFLAVOR)
+               authtab[flavor] = NULL;
+       spin_unlock(&authtab_lock);
+}
+EXPORT_SYMBOL_GPL(svc_auth_unregister);
+
+/**************************************************
+ * 'auth_domains' are stored in a hash table indexed by name.
+ * When the last reference to an 'auth_domain' is dropped,
+ * the object is unhashed and freed.
+ * If auth_domain_lookup fails to find an entry, it will return
+ * it's second argument 'new'.  If this is non-null, it will
+ * have been atomically linked into the table.
+ */
+
+#define        DN_HASHBITS     6
+#define        DN_HASHMAX      (1<<DN_HASHBITS)
+
+static struct hlist_head       auth_domain_table[DN_HASHMAX];
+static spinlock_t      auth_domain_lock =
+       __SPIN_LOCK_UNLOCKED(auth_domain_lock);
+
+void auth_domain_put(struct auth_domain *dom)
+{
+       if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {
+               hlist_del(&dom->hash);
+               dom->flavour->domain_release(dom);
+               spin_unlock(&auth_domain_lock);
+       }
+}
+EXPORT_SYMBOL_GPL(auth_domain_put);
+
+struct auth_domain *
+auth_domain_lookup(char *name, struct auth_domain *new)
+{
+       struct auth_domain *hp;
+       struct hlist_head *head;
+
+       head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
+
+       spin_lock(&auth_domain_lock);
+
+       hlist_for_each_entry(hp, head, hash) {
+               if (strcmp(hp->name, name)==0) {
+                       kref_get(&hp->ref);
+                       spin_unlock(&auth_domain_lock);
+                       return hp;
+               }
+       }
+       if (new)
+               hlist_add_head(&new->hash, head);
+       spin_unlock(&auth_domain_lock);
+       return new;
+}
+EXPORT_SYMBOL_GPL(auth_domain_lookup);
+
+struct auth_domain *auth_domain_find(char *name)
+{
+       return auth_domain_lookup(name, NULL);
+}
+EXPORT_SYMBOL_GPL(auth_domain_find);