1 files changed, 54 insertions, 0 deletions

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 727e506cacda..b5c067bccc45 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -13,6 +13,7 @@
 #include <linux/errno.h>
 #include <linux/hash.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/gss_api.h>
 #include <linux/spinlock.h>
 
 #ifdef RPC_DEBUG
@@ -122,6 +123,59 @@ rpcauth_unregister(const struct rpc_authops *ops)
 }
 EXPORT_SYMBOL_GPL(rpcauth_unregister);
 
+/**
+ * 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(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
 {