Newer NetworkManager versions will run the dispatcher scripts when new
unknown interfaces show up, including 'clat'. That will cause a clatd
restart right after startup, and we'll never get to fully initialise. So
ensure the dispatcher script does nothing if the device in question is
our own 'clat' to prevent this.
This allows clatd to work correctly on 3GPP mobile networks, where the
IID is assigned from the network, rather than being generated using
EUI-64. We still prefer the old method, though, the random one is only
used if no EUI-64 address exists on the PLAT device. Update docs
accordingly.
Also upgrade docs to better describe usage as a SIIT-DC Host Agent.
get_clat_v6_addr() didn't actually check if it saw any Modified EUI-64
based addresses on the PLAT device before proceeding. This caused it to
return a bogus CLAT address (::c1:a700:0) instead of failing with a
useful error message.
In the case of there being more than one EUI-64 based IPv6 address on
the PLAT device, clatd will now pick the one which share the longest
common prefix length with the PLAT prefix when deciding which one to
base the auto-generated CLAT IPv6 address on. This should avoid
accidentally ending up with a ULA-based CLAT IPv6 address when better
alternatives exist.
Resolves#1.
