Getting delegated IPv6 prefix from systemd-networkd

[Ian Pilcher <arequipeno@xxxxxxxxx>]

I've managed to get systemd-networkd to request and IPv6 prefix from my
ISP, and I can see it the journal.  Now I need to programmatically
retrieve it, so that my home-grown scripts can set up the various
routes, address, firewall rules, etc.

(I know that systemd-networkd can allocate subnets from the delegated
prefix to local interfaces, but that's not what I need to do in this
case.)

Is there an API of some sort that my scripts can use?  A file that I can
monitor/parse?  A command that I can run?

My searches thus far are coming up disturbingly empty ...

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