Add license info and update structure

This change adds license to all .rst files under userguide.
It also combines all configguide files into user guide.
New reference.rst with list of links.
Updated glossary, removed separate directories for apexlake and yardstick
framework.

Change-Id: I6532ed073905b0fa85a17e759ea7dc3c24acb91f
Signed-off-by: Ana C <ana.cunha@ericsson.com>
(cherry picked from commit 702eebbf78b29fb9046436dd71575b4f210f4731)

1 files changed, 122 insertions, 0 deletions

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+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, National Center of Scientific Research "Demokritos" and others.
+
+==========================
+Virtual Traffic Classifier
+==========================
+
+Abstract
+========
+
+.. _TNOVA: http://www.t-nova.eu/
+.. _TNOVAresults: http://www.t-nova.eu/results/
+.. _Yardstick: https://wiki.opnfv.org/yardstick
+
+This chapter provides an overview of the virtual Traffic Classifier, a
+contribution to OPNFV Yardstick_ from the EU Project TNOVA_.
+Additional documentation is available in TNOVAresults_.
+
+Overview
+========
+
+The virtual Traffic Classifier (:term:`VTC`) :term:`VNF`, comprises of a
+Virtual Network Function Component (:term:`VNFC`). The :term:`VNFC` contains
+both the Traffic Inspection module, and the Traffic forwarding module, needed
+to run the :term:`VNF`. The exploitation of Deep Packet Inspection
+(:term:`DPI`) methods for traffic classification is built around two basic
+assumptions:
+
+* third parties unaffiliated with either source or recipient are able to
+inspect each IP packet’s payload
+
+* the classifier knows the relevant syntax of each application’s packet
+payloads (protocol signatures, data patterns, etc.).
+
+The proposed :term:`DPI` based approach will only use an indicative, small
+number of the initial packets from each flow in order to identify the content
+and not inspect each packet.
+
+In this respect it follows the Packet Based per Flow State (term:`PBFS`). This
+method uses a table to track each session based on the 5-tuples (src address,
+dest address, src port,dest port, transport protocol) that is maintained for
+each flow.
+
+Concepts
+========
+
+* *Traffic Inspection*: The process of packet analysis and application
+identification of network traffic that passes through the :term:`VTC`.
+
+* *Traffic Forwarding*: The process of packet forwarding from an incoming
+network interface to a pre-defined outgoing network interface.
+
+* *Traffic Rule Application*: The process of packet tagging, based on a
+predefined set of rules. Packet tagging may include e.g. Type of Service
+(:term:`ToS`) field modification.
+
+Architecture
+============
+
+The Traffic Inspection module is the most computationally intensive component
+of the :term:`VNF`. It implements filtering and packet matching algorithms in
+order to support the enhanced traffic forwarding capability of the :term:`VNF`.
+The component supports a flow table (exploiting hashing algorithms for fast
+indexing of flows) and an inspection engine for traffic classification.
+
+The implementation used for these experiments exploits the nDPI library.
+The packet capturing mechanism is implemented using libpcap. When the
+:term:`DPI` engine identifies a new flow, the flow register is updated with the
+appropriate information and transmitted across the Traffic Forwarding module,
+which then applies any required policy updates.
+
+The Traffic Forwarding moudle is responsible for routing and packet forwarding.
+It accepts incoming network traffic, consults the flow table for classification
+information for each incoming flow and then applies pre-defined policies
+marking e.g. :term:`ToS`/Differentiated Services Code Point (:term:`DSCP`)
+multimedia traffic for Quality of Service (:term:`QoS`) enablement on the
+forwarded traffic.
+It is assumed that the traffic is forwarded using the default policy until it
+is identified and new policies are enforced.
+
+The expected response delay is considered to be negligible, as only a small
+number of packets are required to identify each flow.
+
+Graphical Overview
+==================
+
+.. code-block:: console
+
+  +----------------------------+
+  |                            |
+  | Virtual Traffic Classifier |
+  |                            |
+  |     Analysing/Forwarding   |
+  |        ------------>       |
+  |     ethA          ethB     |
+  |                            |
+  +----------------------------+
+       |              ^
+       |              |
+       v              |
+  +----------------------------+
+  |                            |
+  |     Virtual Switch         |
+  |                            |
+  +----------------------------+
+
+Install
+=======
+
+run the build.sh with root privileges
+
+Run
+===
+
+sudo ./pfbridge -a eth1 -b eth2
+
+Development Environment
+=======================
+
+Ubuntu 14.04