networkd: add support for address label
IPv6 address labels are used for address selection; they are described in RFC 3484.
Precedence is managed by userspace, and only the label itself is stored in the kernel.
enp0s25.network
[Match]
Name=enp0s25
[Network]
DHCP=yes
Address = 2001:db8:f00:baa::b
[AddressLabel]
Label=199
Prefix=2001:db8:41::/64
[AddressLabel]
Label=11
Prefix=2001:db8:31::/64
[AddressLabel]
Label=123
Prefix=2001:db8:21::/64
[AddressLabel]
Label=124
Prefix=2001:db8:11::/64
[sus@maximus label]$ ip addrlabel list
prefix ::1/128 label 0
prefix ::/96 label 3
prefix ::ffff:0.0.0.0/96 label 4
prefix 2001:db8:41::/64 dev enp0s25 label 199
prefix 2001:db8:31::/64 dev enp0s25 label 11
prefix 2001:db8:21::/64 dev enp0s25 label 123
prefix 2001:db8:11::/64 dev enp0s25 label 124
prefix 2001::/32 label 6
prefix 2001:10::/28 label 7
prefix 3ffe::/16 label 12
prefix 2002::/16 label 2
prefix fec0::/10 label 11
prefix fc00::/7 label 5
prefix ::/0 label 1