SUNRPC: Add rpcauth_list_flavors()
The gss_mech_list_pseudoflavors() function provides a list of
currently registered GSS pseudoflavors. This list does not include
any non-GSS flavors that have been registered with the RPC client.
nfs4_find_root_sec() currently adds these extra flavors by hand.
Instead, nfs4_find_root_sec() should be looking at the set of flavors
that have been explicitly registered via rpcauth_register(). And,
other areas of code will soon need the same kind of list that
contains all flavors the kernel currently knows about (see below).
Rather than cloning the open-coded logic in nfs4_find_root_sec() to
those new places, introduce a generic RPC function that generates a
full list of registered auth flavors and pseudoflavors.
A new rpc_authops method is added that lists a flavor's
pseudoflavors, if it has any. I encountered an interesting module
loader loop when I tried to get the RPC client to invoke
gss_mech_list_pseudoflavors() by name.
This patch is a pre-requisite for server trunking discovery, and a
pre-requisite for fixing up the in-kernel mount client to do better
automatic security flavor selection.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 31369e9..80bb505 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -43,7 +43,6 @@
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/sunrpc/clnt.h>
-#include <linux/sunrpc/gss_api.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
@@ -2412,11 +2411,15 @@
int i, len, status = 0;
rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
- len = gss_mech_list_pseudoflavors(&flav_array[0]);
- flav_array[len] = RPC_AUTH_NULL;
- len += 1;
+ len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
+ BUG_ON(len < 0);
for (i = 0; i < len; i++) {
+ /* AUTH_UNIX is the default flavor if none was specified,
+ * thus has already been tried. */
+ if (flav_array[i] == RPC_AUTH_UNIX)
+ continue;
+
status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
continue;