ansible.nftables/defaults/main.yml

---
# defaults file for nftables

# packages
nft_pkg_manage: true
nft_pkg_state: 'installed'

# files
nft_main_conf_path: '/etc/nftables.conf'
nft_main_conf_content: 'etc/nftables.conf.j2'
nft_input_conf_path: '/etc/nftables.d/filter-input.nft'
nft_input_conf_content: 'etc/nftables.d/filter-input.nft.j2'
nft_output_conf_path: '/etc/nftables.d/filter-output.nft'
nft_output_conf_content: 'etc/nftables.d/filter-output.nft.j2'
nft_define_conf_path: '/etc/nftables.d/defines.nft'
nft_define_conf_content: 'etc/nftables.d/defines.nft.j2'
nft_set_conf_path: '/etc/nftables.d/sets.nft'
nft_set_conf_content: 'etc/nftables.d/sets.nft.j2'

# rules
nft_global_default_rules:
  000 state management:
    - ct state established,related accept
    - ct state invalid drop
nft_global_group_rules: {}
nft_global_host_rules: {}

nft_input_default_rules:
  000 policy:
    - type filter hook input priority 0; policy drop;
  005 global:
    - jump global
  010 drop unwanted:
    - ip daddr @blackhole counter drop
  015 localhost:
    - iif lo accept
  040 dhcp:
    - udp sport bootps udp dport bootpc limit rate 6/minute accept
  220 ssh:
    - tcp dport ssh ct state new counter accept
nft_input_group_rules: {}
nft_input_host_rules: {}

nft_output_default_rules:
  000 policy:
    - type filter hook output priority 0; policy drop;
  005 global:
    - jump global
  015 localhost:
    - oif lo accept
  040 dhcp:
    - udp sport bootpc udp dport bootps limit rate 6/minute accept
  050 domain:
    - udp dport domain ct state new accept
nft_output_group_rules: {}
nft_output_host_rules: {}

# define nft vars
nft_define_default:
  broadcast and multicast:
    desc: 'broadcast and multicast'
    name: badcast_addr
    value: '{ 255.255.255.255, 224.0.0.1, 224.0.0.251 }'
nft_define_group: {}
nft_define_host: {}

nft_set_default:
  blackhole:
    - type ipv4_addr;
    - elements = $badcast_addr
nft_set_group: {}
nft_set_host: {}

# service
nft_service_manage: true
nft_service_name: 'nftables'
nft_service_enabled: true