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All of the iptables functions eventually call down to a single bottom-level function, and fortunately, ip6tables syntax (for all the args that we use) is identical to iptables format (except the addresses), so all we need to do is: 1) Get an address family down to the lowest level function in each case, either implied through an address, or explicitly when no address is in the parameter list, and 2) At the lowest level, just decide whether to call "iptables" or "ip6tables" based on the family. The location of the ip6tables binary is determined at build time by autoconf. If a particular target system happens to not have ip6tables installed, any attempts to run it will generate an error, but that won't happen unless someone tries to define an IPv6 address for a network. This is identical behavior to IPv4 addresses and iptables.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>