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-/*
- *  OpenVPN -- An application to securely tunnel IP networks
- *             over a single TCP/UDP port, with support for SSL/TLS-based
- *             session authentication and key exchange,
- *             packet encryption, packet authentication, and
- *             packet compression.
- *
- *  Copyright (C) 2010-2018 Fox Crypto B.V. <openvpn@fox-it.com>
- *
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2
- *  as published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/**
- * @file
- * Data Channel Control module documentation file.
- */
-
-/**
- * @defgroup data_control Data Channel Control module
- *
- * This module controls the processing of packets as they pass through the
- * data channel.
- *
- * The Data Channel Control module controls the processing of packets as
- * they pass through the data channel.  The processing includes packet
- * compression, fragmentation, and the performing of security operations
- * on the packets.  This module does not do the processing itself, but
- * passes the packet to other data channel modules to perform the
- * appropriate actions.
- *
- * Packets can travel in two directions through the data channel.  They
- * can be going to a remote destination which is reachable through a VPN
- * tunnel, in which case this module prepares them to be sent out through
- * a VPN tunnel.  On the other hand, they can have been received through a
- * VPN tunnel from a remote OpenVPN peer, in which case this module
- * retrieves the packet in its original form as it was before entering the
- * VPN tunnel on the remote OpenVPN peer.  How this module processes
- * packets traveling in the two directions is discussed in more detail
- * below.
- *
- * @par Packets to be sent to a remote OpenVPN peer
- * This module's main function for processing packets traveling in this
- * direction is \c encrypt_sign(), which performs the following processing
- * steps:
- * - Call the \link compression Data Channel Compression module\endlink to
- *   perform packet compression if necessary.
- * - Call the \link fragmentation Data Channel Fragmentation
- *   module\endlink to perform packet fragmentation if necessary.
- * - Call the \link data_crypto Data Channel Crypto module\endlink to
- *   perform the required security operations.
- *
- * @par
- * See the \c encrypt_sign() documentation for details of these
- * interactions.
- *
- * @par
- * After the above processing is complete, the packet is ready to be sent
- * to a remote OpenVPN peer as a VPN tunnel packet.  The actual sending of
- * the packet is handled by the \link external_multiplexer External
- * Multiplexer\endlink.
- *
- * @par Packets received from a remote OpenVPN peer
- * The function that controls how packets traveling in this direction are
- * processed is \c process_incoming_link().  That function, however, also
- * performs some of the tasks required for the \link external_multiplexer
- * External Multiplexer\endlink and is therefore listed as part of that
- * module, instead of here.
- *
- * @par
- * After the \c process_incoming_link() function has determined that a
- * received packet is a data channel packet, it performs the following
- * processing steps:
- * - Call the \link data_crypto Data Channel Crypto module\endlink to
- *   perform the required security operations.
- * - Call the \link fragmentation Data Channel Fragmentation
- *   module\endlink to perform packet reassembly if necessary.
- * - Call the \link compression Data Channel Compression module\endlink to
- *   perform packet decompression if necessary.
- *
- * @par
- * See the \c process_incoming_link() documentation for details of these
- * interactions.
- *
- * @par
- * After the above processing is complete, the packet is in its original
- * form again as it was received by the remote OpenVPN peer.  It can now
- * be routed further to its final destination.  If that destination is a
- * locally reachable host, then the \link internal_multiplexer Internal
- * Multiplexer\endlink will send it there.
- */