NetLabel Introduction
  ==============================================================================
  Paul Moore, paul.moore@hp.com
  
  August 2, 2006
  
   * Overview
  
  NetLabel is a mechanism which can be used by kernel security modules to attach
  security attributes to outgoing network packets generated from user space
  applications and read security attributes from incoming network packets.  It
  is composed of three main components, the protocol engines, the communication
  layer, and the kernel security module API.
  
   * Protocol Engines
  
  The protocol engines are responsible for both applying and retrieving the
  network packet's security attributes.  If any translation between the network
  security attributes and those on the host are required then the protocol
  engine will handle those tasks as well.  Other kernel subsystems should
  refrain from calling the protocol engines directly, instead they should use
  the NetLabel kernel security module API described below.
  
  Detailed information about each NetLabel protocol engine can be found in this
  directory, consult '00-INDEX' for filenames.
  
   * Communication Layer
  
  The communication layer exists to allow NetLabel configuration and monitoring
  from user space.  The NetLabel communication layer uses a message based
  protocol built on top of the Generic NETLINK transport mechanism.  The exact
  formatting of these NetLabel messages as well as the Generic NETLINK family

  names can be found in the 'net/netlabel/' directory as comments in the

  header files as well as in 'include/net/netlabel.h'.
  
   * Security Module API
  
  The purpose of the NetLabel security module API is to provide a protocol
  independent interface to the underlying NetLabel protocol engines.  In addition
  to protocol independence, the security module API is designed to be completely
  LSM independent which should allow multiple LSMs to leverage the same code
  base.
  
  Detailed information about the NetLabel security module API can be found in the
  'include/net/netlabel.h' header file as well as the 'lsm_interface.txt' file
  found in this directory.