extensions: libxt_addrtype: Add translation to nft

extensions: libxt_addrtype: Add translation to nft

Translate addrtype match into fib expression:

$ iptables-translate -A INPUT -m addrtype --src-type LOCAL
nft add rule ip filter INPUT fib saddr type local counter

$ iptables-translate -A INPUT -m addrtype --dst-type LOCAL
nft add rule ip filter INPUT fib daddr type local counter

$ iptables-translate -A INPUT -m addrtype ! --dst-type ANYCAST,LOCAL
nft add rule ip filter INPUT fib daddr type != { local, anycast } counter

$ iptables-translate -A INPUT -m addrtype --limit-iface-in --dst-type ANYCAST,LOCAL
nft add rule ip filter INPUT fib daddr . iif type { local, anycast } counter

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>