When using iwd.conf:[General].EnableNetworkConfiguration=true, it is not
possible to configure systemd.network:[Network].MulticastDNS= as
systemd-networkd considers the link to be unmanaged. This patch allows
iwd to configure that setting on systemd-resolved directly.
This also changes the resolve API a little bit to act as a 'set' API
instead of an incremental 'add' API. This is actually easier to manage
in the resolve module since both systemd and resolvconf want changes
wholesale and not incrementally.
Resolve module does not currently track any state that has been set on
a per ifindex basis. This was okay while the set of information we
supported was quite small. However, with dhcpv6 support being prepared,
a more flexible framework is needed.
Change the resolve API to allocate and return an instance for a given
ifindex that has the ability to track information that was provided.
The module is responsible for the configuration of the address
resolution services. It will consist of the multiple service
specific plugins such as: systemd-resolved plugin, dnsmasq
plugin, etc.
