ansible.nftables/defaults/main.yml

---
# defaults file for nftables

# packages
nft_pkg_manage: true
nft_pkg_state: 'installed'

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

# rules
nft_global_default_rules:
  005 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
  200 input udp accepted:
    - udp dport @input_udp_accept ct state new accept
  210 input tcp accepted:
    - tcp dport @input_tcp_accept ct state new 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
  050 icmp:
    - ip protocol icmp accept
  200 output udp accepted:
    - udp dport @output_udp_accept ct state new accept
  210 output tcp accepted:
    - tcp dport @output_tcp_accept 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 }'
  input tcp accepted:
    name: input_tcp_accept
    value: '{ ssh }'
  input udp accepted:
    name: input_udp_accept
    value: 'none'
  output tcp accepted:
    name: output_tcp_accept
    value: '{ http, https, hkp }'
  output udp accepted:
    name: output_udp_accept
    value: '{ bootps, domain, ntp }'
nft_define_group: {}
nft_define_host: {}

# sets and maps
nft_set_default:
  blackhole:
    - type ipv4_addr;
    - elements = $badcast_addr
  input_tcp_accept:
    - type inet_service; flags interval;
    - elements = $input_tcp_accept
  input_udp_accept:
    - type inet_service; flags interval;
  output_tcp_accept:
    - type inet_service; flags interval;
    - elements = $output_tcp_accept
  output_udp_accept:
    - type inet_service; flags interval;
    - elements = $output_udp_accept
nft_set_group: {}
nft_set_host: {}

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