NFS: Introduce nfs4_validate_mount_options
Refactor NFSv4 mount processing to break out mount data validation
in the same way it's broken out in the NFSv2/v3 mount path.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index baf75e9..ed3ec44 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -814,6 +814,89 @@
}
/*
+ * Validate NFSv4 mount options
+ */
+static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
+ const char *dev_name,
+ struct sockaddr_in *addr,
+ rpc_authflavor_t *authflavour,
+ char **hostname,
+ char **mntpath,
+ char **ip_addr)
+{
+ struct nfs4_mount_data *data = *options;
+ char *c;
+
+ if (data == NULL)
+ goto out_no_data;
+
+ switch (data->version) {
+ case 1:
+ if (data->host_addrlen != sizeof(*addr))
+ goto out_no_address;
+ if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
+ return -EFAULT;
+ if (addr->sin_port == 0)
+ addr->sin_port = htons(NFS_PORT);
+ if (!nfs_verify_server_address((struct sockaddr *) addr))
+ goto out_no_address;
+
+ switch (data->auth_flavourlen) {
+ case 0:
+ *authflavour = RPC_AUTH_UNIX;
+ break;
+ case 1:
+ if (copy_from_user(authflavour, data->auth_flavours,
+ sizeof(*authflavour)))
+ return -EFAULT;
+ break;
+ default:
+ goto out_inval_auth;
+ }
+
+ c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ *hostname = c;
+
+ c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ *mntpath = c;
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
+
+ c = strndup_user(data->client_addr.data, 16);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ *ip_addr = c;
+
+ break;
+ default:
+ goto out_bad_version;
+ }
+
+ return 0;
+
+out_no_data:
+ dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
+ return -EINVAL;
+
+out_inval_auth:
+ dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
+ data->auth_flavourlen);
+ return -EINVAL;
+
+out_no_address:
+ dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
+ return -EINVAL;
+
+out_bad_version:
+ dfprintk(MOUNT, "NFS4: bad nfs_mount_data version %d\n",
+ data->version);
+ return -EINVAL;
+}
+
+/*
* Get the superblock for an NFS4 mountpoint
*/
static int nfs4_get_sb(struct file_system_type *fs_type,
@@ -826,68 +909,14 @@
rpc_authflavor_t authflavour;
struct nfs_fh mntfh;
struct dentry *mntroot;
- char *p, *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
+ char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
int error;
- if (data == NULL) {
- dprintk("%s: missing data argument\n", __FUNCTION__);
- return -EINVAL;
- }
- if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
- dprintk("%s: bad mount version\n", __FUNCTION__);
- return -EINVAL;
- }
-
- /* We now require that the mount process passes the remote address */
- if (data->host_addrlen != sizeof(addr))
- return -EINVAL;
-
- if (copy_from_user(&addr, data->host_addr, sizeof(addr)))
- return -EFAULT;
-
- if (!nfs_verify_server_address((struct sockaddr *) &addr)) {
- dprintk("%s: mount program didn't pass remote IP address!\n",
- __FUNCTION__);
- return -EINVAL;
- }
-
- /* RFC3530: The default port for NFS is 2049 */
- if (addr.sin_port == 0)
- addr.sin_port = htons(NFS_PORT);
-
- /* Grab the authentication type */
- authflavour = RPC_AUTH_UNIX;
- if (data->auth_flavourlen != 0) {
- if (data->auth_flavourlen != 1) {
- dprintk("%s: Invalid number of RPC auth flavours %d.\n",
- __FUNCTION__, data->auth_flavourlen);
- error = -EINVAL;
- goto out;
- }
-
- if (copy_from_user(&authflavour, data->auth_flavours,
- sizeof(authflavour))) {
- error = -EFAULT;
- goto out;
- }
- }
-
- p = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
- if (IS_ERR(p))
- goto out_err;
- hostname = p;
-
- p = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
- if (IS_ERR(p))
- goto out_err;
- mntpath = p;
-
- dprintk("MNTPATH: %s\n", mntpath);
-
- p = strndup_user(data->client_addr.data, 16);
- if (IS_ERR(p))
- goto out_err;
- ip_addr = p;
+ /* Validate the mount data */
+ error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
+ &hostname, &mntpath, &ip_addr);
+ if (error < 0)
+ goto out;
/* Get a volume representation */
server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
@@ -932,10 +961,6 @@
kfree(hostname);
return error;
-out_err:
- error = PTR_ERR(p);
- goto out;
-
out_free:
nfs_free_server(server);
goto out;
