vardir — Shorewall file
/etc/shorewall[6]/vardir 
This file does not exist by default. You may create the file if you
    want to change the directory used by Shorewall to store state information,
    including compiled firewall scripts. By default, the directory used is
    /var/lib/shorewall/ for IPv4 and /var/lib/shorewall6/
    for IPv6
The file contains a single variable assignment:
VARDIR=directory
where directory is the name of a
    directory. If you add this file, you should copy the files from
    /var/lib/shorewall to the new directory before
    performing a shorewall restart.