strongSwan charon library

 The strongSwan VPN suite uses the native IPsec stack in the standard
 Linux kernel. It supports both the IKEv1 and IKEv2 protocols.
 .
 This package contains the charon library, used by IKE client like
 strongswan-charon, strongswan-charon-cmd or strongswan-nm as well as standard
 plugins:
   - socket-default
   - counters
   - bypass-lan (disabled by default)
 .
 On Linux, it also contains the xfrmi binary which can be used on Linux 4.19+
 to create XFRM interfaces (for more information, see
 https://wiki.strongswan.org/projects/strongswan/wiki/RouteBasedVPN)