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+.. _vpp_sswan_doc:
+
+VPP-SSWAN
+=======================
+
+``VPP-SSWAN`` is a StrongSwan plugin that helps offloading Strongswan IPsec ESP
+process from Linux Kernel to ``VPP``.
+
+The kernel-vpp plugin is an interface to the IPsec and networking backend for
+`VPP <https://wiki.fd.io/view/VPP>`__ platform using the
+`VPP C API <https://wiki.fd.io/view/VPP/How_To_Use_The_C_API>`__.
+It provides address and routing lookup functionality and installs routes for
+IPsec traffic.
+It installs and maintains Security Associations and Policies to the
+`VPP IPsec <https://wiki.fd.io/view/VPP/IPSec_and_IKEv2#IPSec>`__.
+
+Prerequisites
+-------------
+
+``VPP`` in release mode should be built before compiling ``vpp-swan plugin``.
+The dependencies of ``StrongSwan`` should be installed before building
+``VPP-SSWAN``. In addition ``libsystemd-dev`` should be installed.
+
+Build VPP Strongswan Plugin
+-------------
+
+The following list of things will be done to build ``vpp-swan plugin``:
+
+- download strongswan source code to:
+``path/to/vpp/build/external/downloads``
+
+- unzip source code strongswan to:
+``path/to/vpp/build-root/build-vpp-native/external/sswan``
+
+- check if you have installed packages: ``libsystemd-dev`` on your OS
+
+- configure strongswan by:
+``./configure --prefix=/usr --sysconfdir=/etc --enable-libipsec
+--enable-systemd --enable-swanctl --disable-gmp --enable-openssl``
+
+- compile strongswan in:
+``path/to/vpp/build-root/build-vpp-native/external/sswan``
+
+- compile ``vpp-swan plugin`` by:
+
+::
+
+   ./make all
+
+- if everything it ok, copy the compiled ``vpp-swan plugin`` to:
+``/usr/lib/ipsec/plugins``
+
+Build/install Strongswan
+-------------
+
+It is recommended to use ``Strongswan`` in version ``5.9.6`` or ``5.9.5``
+installed from this script, due to configuration Strongswan that is required.
+Only version ``5.9.5`` and ``5.9.6`` was tested with this plugin.
+
+To install the built Strongswan, please execute the following command:
+
+::
+
+   path/to/vpp/build-root/build-vpp-native/external/sswan/sudo make install
+
+Insert plugin in runtime mode
+-------------
+
+After builded this plugin and also installed Strongswan you can loaded plugin
+into Strongswan directory by:
+
+::
+
+   ./make install
+
+Or you can do manually copy ``libstrongswan-kernel-vpp.so`` into:
+``/usr/lib/ipsec/plugins`` and also ``kernel-vpp.conf`` into: ``/etc/strongswan.d/charon/``
+
+And also you should restart Strongswan by:
+
+::
+
+   systemctl restart strongswan.service
+
+Configuration Strongswan
+-------------
+In ``swanctl.conf`` file you can find example configuration to initialize
+connections between two endpoints.
+
+Copy this file into: ``/etc/swanctl/conf.d/swanctl.conf``
+
+Configuration VPP
+-------------
+
+In your ``startup.conf`` add these following commands:
+
+::
+
+   plugins {
+     plugin linux_cp_plugin.so { enable }
+     plugin ikev2_plugin.so { disable }
+    }
+
+   linux-cp {
+      lcp-sync
+   }
+
+To enable ``CP Plugin`` and disable ``IKEv2`` plugin.
+
+These following commands executed in ``VPP``:
+
+::
+
+   lcp create eth2 host-if eth2
+   set interface state eth2 up
+   set interface ip address eth2 192.168.0.2/24
+   set int state eth1 up
+   set int ip addr eth1 192.168.200.1/24
+
+To create interface by ``CP Plugin`` and also setup two ethernet interfaces.
+
+Misc
+-------------
+This plugin is based on:
+`https://github.com/matfabia/strongswan
+<https://github.com/matfabia/strongswan>`__
+
+Author: Matus Fabian <matfabia@cisco.com>
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