Moving the current docs to userguide

Change-Id: I500d70b7ed2a17e21548a27810ac7e51e44b7841
Signed-off-by: Deepak S <deepak.s@linux.intel.com>

1 files changed, 197 insertions, 0 deletions

diff --git a/docs/testing/user/userguide/vCGNAPT/README.rst b/docs/testing/user/userguide/vCGNAPT/README.rst
new file mode 100644
index 00000000..dd6bb079
--- /dev/null
+++ b/docs/testing/user/userguide/vCGNAPT/README.rst
@@ -0,0 +1,197 @@
+.. 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.
+
+========================================================
+vCGNAPT - Readme
+========================================================
+
+Introduction
+==============
+This application implements vCGNAPT. The idea of vCGNAPT is to extend the life of
+the service providers IPv4 network infrastructure and mitigate IPv4 address
+exhaustion by using address and port translation in large scale. It processes the
+traffic in both the directions.
+
+It also supports the connectivity between the IPv6 access network to IPv4 data network
+using the IPv6 to IPv4 address translation and vice versa.
+
+About DPDK
+----------
+The DPDK IP Pipeline Framework provides set of libraries to build a pipeline
+application. In this document, CG-NAT application will be explained with its
+own building blocks.
+
+This document assumes the reader possess the knowledge of DPDK concepts and IP
+Pipeline Framework. For more details, read DPDK Getting Started Guide, DPDK
+Programmers Guide, DPDK Sample Applications Guide.
+
+Scope
+==========
+This application provides a standalone DPDK based high performance vCGNAPT
+Virtual Network  Function implementation.
+
+Features
+===========
+The vCGNAPT VNF currently supports the following functionality:
+  • Static NAT
+  • Dynamic NAT
+  • Static NAPT
+  • Dynamic NAPT
+  • ARP (request, response, gratuitous)
+  • ICMP (terminal echo, echo response, passthrough)
+  • ICMPv6 and ND (Neighbor Discovery)
+  • UDP, TCP and ICMP protocol passthrough
+  • Multithread support
+  • Multiple physical port support
+  • Limiting max ports per client
+  • Limiting max clients per public IP address
+  • Live Session tracking to NAT flow
+  • NAT64
+  • PCP Support
+  • ALG SIP
+  • ALG FTP
+
+High Level Design
+====================
+The Upstream path defines the traffic from Private to Public and the downstream
+path defines the traffic from Public to Private. The vCGNAPT has same set of
+components to process Upstream and Downstream traffic.
+
+In vCGNAPT application, each component is constructed as IP Pipeline framework.
+It includes Master pipeline component, load balancer pipeline component and vCGNAPT
+pipeline component.
+
+A Pipeline framework is collection of input ports, table(s), output ports and
+actions (functions). In vCGNAPT pipeline, main sub components are the Inport function
+handler, Table and Table function handler. vCGNAPT rules will be configured in the
+table which translates egress and ingress traffic according to physical port
+information from which side packet is arrived. The actions can be forwarding to the
+output port (either egress or ingress) or to drop the packet.
+
+vCGNAPT Graphical Overview
+==========================
+The idea of vCGNAPT is to extend the life of the service providers IPv4 network infrastructure
+and mitigate IPv4 address exhaustion by using address and port translation in large scale.
+It processes the traffic in both the directions.
+
+.. code-block:: console
+
+  +------------------+
+  |                 +-----+
+  | Private consumer | CPE  |---------------+
+  |   IPv4 traffic  +-----+                 |
+  +------------------+                      |
+                 +------------------+       v        +----------------+
+                 |                  | +------------+ |                |
+                 |   Private IPv4   | |  vCGNAPT   | |    Public      |
+                 |  access network  | |   NAT44    | |  IPv4 traffic  |
+                 |                  | +------------+ |                |
+                 +------------------+       |        +----------------+
+  +------------------+                      |
+  |                 +-----+                 |
+  | Private consumer| CPE |-----------------+
+  |  IPv4 traffic   +-----+
+  +------------------+
+      Figure 1: vCGNAPT deployment in Service provider network
+
+
+
+Components of vCGNAPT
+=====================
+
+In vCGNAPT, each component is constructed as a packet framework. It includes Master pipeline
+component, driver, load balancer pipeline component and vCGNAPT worker pipeline component. A
+pipeline framework is a collection of input ports, table(s), output ports and actions
+(functions).
+
+Receive and transmit driver
+----------------------------
+Packets will be received in bulk and provided to load balancer thread. The transmit takes
+packets from worker thread in a dedicated ring and sent to the hardware queue.
+
+ARPICMP pipeline
+------------------------
+ARPICMP pipeline is responsible for handling all l2l3 arp related packets.
+
+This component does not process any packets and should configure with Core 0,
+to save cores for other components which processes traffic. The component
+is responsible for:
+1. Initializing each component of the Pipeline application in different threads
+2. Providing CLI shell for the user
+3. Propagating the commands from user to the corresponding components.
+4. ARP and ICMP are handled here.
+
+Load Balancer pipeline
+------------------------
+Load balancer is part of the Multi-Threaded CGMAPT release which distributes
+the flows to Multiple ACL worker threads.
+
+Distributes traffic based on the 2 or 5 tuple (source address, source port,
+destination  address, destination port and protocol) applying an XOR logic
+distributing the  load to active worker threads, thereby maintaining an
+affinity of flows to  worker threads.
+
+Tuple can be modified/configured using configuration file
+
+vCGNAPT - Static
+====================
+The vCGNAPT component performs translation of private IP & port to public IP &
+port at egress side and public IP & port to private IP & port at Ingress side
+based on the NAT rules added to the pipeline Hash table. The NAT rules are
+added to the Hash table via user commands. The packets that have a matching
+egress key or ingress key in the NAT table will be processed to change IP &
+port and will be forwarded to the output port. The packets that do not have a
+match will be taken a default action. The default action may result in drop of
+the packets.
+
+vCGNAPT - Dynamic
+===================
+The vCGNAPT component performs translation of private IP & port to public IP & port
+at egress side and public IP & port to private IP & port at Ingress side based on the
+NAT rules added to the pipeline Hash table. Dynamic nature of vCGNAPT refers to the
+addition of NAT entries in the Hash table dynamically when new packet arrives. The NAT
+rules will be added to the Hash table automatically when there is no matching entry in
+the table and the packet is circulated through software queue. The packets that have a
+matching egress key or ingress key in the NAT table will be processed to change IP &
+port and will be forwarded to the output port defined in the entry.
+
+Dynamic vCGNAPT acts as static one too, we can do NAT entries statically. Static NAT
+entries port range must not conflict to dynamic NAT port range.
+
+vCGNAPT Static Topology
+------------------------
+
+::
+
+  IXIA(Port 0)-->(Port 0)VNF(Port 1)-->(Port 1) IXIA
+  operation:
+  Egress --> The packets sent out from ixia(port 0) will be CGNAPTed to ixia(port 1).
+  Igress --> The packets sent out from ixia(port 1) will be CGNAPTed to ixia(port 0).
+
+vCGNAPT Dynamic Topology (L4REPLAY)
+------------------------------------
+
+::
+
+  IXIA(Port 0)-->(Port 0)VNF(Port 1)-->(Port 0)L4REPLAY
+  operation:
+  Egress --> The packets sent out from ixia will be CGNAPTed to L3FWD/L4REPLAY.
+  Ingress --> The L4REPLAY upon reception of packets (Private to Public Network),
+  will immediately replay back the traffic to IXIA interface. (Pub -->Priv).
+
+How to run L4Replay
+--------------------
+After the installation of samplevnf:
+
+::
+
+ go to <samplevnf/VNFs/L4Replay>
+ ./buid/L4replay -c  core_mask -n no_of_channels(let it be as 2) -- -p PORT_MASK --config="(port,queue,lcore)"
+     eg: ./L4replay -c 0xf -n 4 -- -p 0x3 --config="(0,0,1)"
+
+Installation, Compile and Execution
+====================================
+Plase refer to <samplevnf>/docs/vCGNAPT/INSTALL.rst for installation, configuration, compilation
+and execution.