IPv6 RA messages specific routes

[cfilipem]

Is it possible to have dhcpcd handling IPv6 more specific routes received in IPv6 Router Advertisement messages, as described in RFC4191?

[goertzenator]

A motivating use case:

1. You have a router which provides internet access (GUA prefix) and offers a default route.
2. You add a separate VPN router (ULA prefix) onto the same link which is supposed to handle all traffic on your corporate extranet. This router advertises a non-default route for a /48 version of the ULA prefix, but no default route.

At the moment dhcpcd will not pick up the non-default route from the VPN router and will just push everything down the default route.

[goertzenator]

I am taking a swing at this now.

[goertzenator]

Basic functionality is working, but I need to test more and read RFC4191 more thoroughly to see if there is stuff I should add.

https://github.com/goertzenator/dhcpcd/tree/rfc4191route