loki/ansible/etc/nftables.conf.j2

#!/usr/sbin/nft -f

flush ruleset

table inet filter {
        chain input {
                type filter hook input priority 0;

                # accept any localhost traffic
                iif lo accept

                # accept traffic originated from us
                ct state established,related accept

                # allow ICMP packets
                # note that for IPv6 nd-neighbor-solicit, nd-router-advert, nd-neighbor-advert are needed to not break connectivity
                ip6 nexthdr icmpv6 icmpv6 type { echo-request, destination-unreachable, packet-too-big, time-exceeded, parameter-problem, nd-router-advert, nd-neighbor-solicit, nd-neighbor-advert } accept
                ip protocol icmp icmp type { echo-request, destination-unreachable, router-advertisement, time-exceeded, parameter-problem } accept

                # activate the following line to accept common local services
                tcp dport { 80, 443, {{ ssh_port }}, {{ gitlab_ssh_port }} } ct state new accept

                # count and drop any other traffic
                counter drop
        }
}