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Since we can't (currently) rely on the ability to provide blanket support for all possible network changes by calling the toplevel netdev hostside disconnect/connect functions (due to qemu only supporting a lockstep between initialization of host side and guest side of devices), in order to support live change of an interface's nwfilter we need to make a special purpose function to only call the nwfilter teardown and setup functions if the filter for an interface (or its parameters) changes. The pattern is nearly identical to that used to change the bridge that an interface is connected to. This patch was inspired by a request from Guido Winkelmann <guido@sagersystems.de>, who tested an earlier version.
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>