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0f7436ca54
commit db488c79 assumed that dnsmasq would complete IPv6 DAD before daemonizing, but in reality it doesn't wait, which creates problems when libvirt's bridge driver sets the matching "dummy tap device" to IFF_DOWN prior to DAD completing. This patch waits for DAD completion by periodically polling the kernel using netlink to check whether there are any IPv6 addresses assigned to bridge which have a 'tentative' state (if there are any in this state, then DAD hasn't yet finished). After DAD is finished, execution continues. To avoid an endless hang in case something was wrong with the kernel's DAD, we wait a maximum of 5 seconds.
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>