About the SMB error codes.

[Christopher R. Hertel]

On Wed, May 22, 2013 at 03:56:54AM +0000, Tayade, Nilesh wrote:
:
:
:

> I looked into the MS-CIFS documentation. In my case the 
> STATUS_INVALID_DEVICE_REQUEST error is generated for NT-TRANS request 
> with IOCTL subcommand.

> But in MS-CIFS documentation, the error codes list for NT-TRANS command 
> with IOCTL subcommand doesn't show the STATUS_INVALID_DEVICE_REQUEST 
> error.
> What's wrong?

The error code is being returned from the IOCTL, not the NT_TRANS.  
You'll have to look at the IOCTL documentation (I don't know where to find 
that) to find out what it means.

> Please refer the attached pcap file with 2 SMB packets. The IOCTL is 
> being performed on some file system resource.
> And the IOCTL parameters show 'Unknown' function. Could this be the 
> reason of error? Could this happen because of incompatibility of Windows 
> versions?

What is happening is fairy clear.  The client is trying to pass a request 
to a device on the server.  The device is either the wrong type of device 
or not a device at all, so it doesn't understand the request, and is 
returning an error.  (...or the ioctl system on the server is returning 
the error because it has detected that the handle you passed is of the 
wrong type).

In any case, it's not the SMB system that's returning the error.  NT_TRANS 
is just a transport layer.  It is handling off the request and returning 
the error message that it receives.

Hope that helps.

Chris -)-----