ansible/roles/nftables/defaults/main.yaml

---
# nftables_ufw_package_name: ufw
# nftables_ufw_package_state: absent

# nftables_package_name: nftables
# nftables_package_state: present

# nftables_service_name: nftables
# nftables_service_state: started
# nftables_service_enabled: true

# nftables_config_path: /etc/nftables.conf

nftables_builtin_defines:
  REQUIRED_ICMPV6_TYPES:
    - 1-4
    - 130-136
    - 141-143
    - 148-149
    - 151-153
  TRACEROUTE_UDP_PORTS: 33434-33534

nftables_builtin_sets:
  blackhole4:
    - type ipv4_addr
    - flags interval
  blackhole6:
    - type ipv6_addr
    - flags interval
  tcp_input_accept:
    - type inet_service
    - flags interval
    - elements = { ssh }
  udp_input_accept:
    - type inet_service
    - flags interval

nftables_input_builtin_rules:
  '000 policy':
    - type filter hook input priority filter; policy drop;
  '010 blackhole':
    - ip saddr @blackhole4 drop
    - ip6 saddr @blackhole6 drop
  '020 related established':
    - ct state established,related accept
    - ct state invalid drop
  '030 loopback':
    - iifname "lo" accept
  '040 icmp':
    - icmpv6 type $REQUIRED_ICMPV6_TYPES accept
    - icmpv6 type echo-request accept
    - icmp type echo-request accept
  '050 tcp accept':
    - tcp dport @tcp_input_accept accept
  '060 udp accept':
    - udp dport @udp_input_accept accept
  '999 traceroute':
    # this should be last because these ports could be allowed
    - udp dport $TRACEROUTE_UDP_PORTS reject

nftables_forward_builtin_rules:
  '000 policy':
    - type filter hook forward priority filter; policy drop;
  '010 related established':
    - ct state { established, related } accept

nftables_output_builtin_rules:
  '000 policy':
    - type filter hook output priority filter; policy accept;
  '010 blackhole':
    - ip daddr @blackhole4 drop
    - ip6 daddr @blackhole6 drop
  '020 related established':
    - ct state { established, related } accept

nftables_defines:
  {} 

nftables_sets:
  {}

nftables_input_rules:
  {}

nftables_forward_rules:
  {}

nftables_output_rules:
  {}