NFS: Set default port for NFSv4, with support for AF_INET6

Create a helper function to set the default NFS port for NFSv4 mount
points.  The helper supports both AF_INET and AF_INET6 family addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 28 insertions, 4 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index ef1aad774e6c..a88697ff19ef 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1596,6 +1596,28 @@ static void nfs4_fill_super(struct super_block *sb)
 }
 
 /*
+ * If the user didn't specify a port, set the port number to
+ * the NFS version 4 default port.
+ */
+static void nfs4_default_port(struct sockaddr *sap)
+{
+        switch (sap->sa_family) {
+        case AF_INET: {
+                struct sockaddr_in *ap = (struct sockaddr_in *)sap;
+                if (ap->sin_port == 0)
+                        ap->sin_port = htons(NFS_PORT);
+                break;
+        }
+        case AF_INET6: {
+                struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
+                if (ap->sin6_port == 0)
+                        ap->sin6_port = htons(NFS_PORT);
+                break;
+        }
+        }
+}
+
+/*
  * Validate NFSv4 mount options
  */
 static int nfs4_validate_mount_data(void *options,
@@ -1628,12 +1650,13 @@ static int nfs4_validate_mount_data(void *options,
                                    data->host_addr,
                                    sizeof(args->nfs_server.address)))
                         return -EFAULT;
-                if (args->nfs_server.address.sin_port == 0)
-                        args->nfs_server.address.sin_port = htons(NFS_PORT);
                 if (!nfs_verify_server_address((struct sockaddr *)
                                                 &args->nfs_server.address))
                         goto out_no_address;
 
+                nfs4_default_port((struct sockaddr *)
+                                  &args->nfs_server.address);
+
                 switch (data->auth_flavourlen) {
                 case 0:
                         args->auth_flavors[0] = RPC_AUTH_UNIX;
@@ -1687,12 +1710,13 @@ static int nfs4_validate_mount_data(void *options,
                 if (nfs_parse_mount_options((char *)options, args) == 0)
                         return -EINVAL;
 
-                if (args->nfs_server.address.sin_port == 0)
-                        args->nfs_server.address.sin_port = htons(NFS_PORT);
                 if (!nfs_verify_server_address((struct sockaddr *)
                                                 &args->nfs_server.address))
                         return -EINVAL;
 
+                nfs4_default_port((struct sockaddr *)
+                                  &args->nfs_server.address);
+
                 switch (args->auth_flavor_len) {
                 case 0:
                         args->auth_flavors[0] = RPC_AUTH_UNIX;