root/usr/share/firewall4/templates/zone-drop-invalid.uc

   1 {%+ if (zone.masq ^ zone.masq6): -%}
   2         meta nfproto {{ fw4.nfproto(zone.masq ? 4 : 6) }} {%+ endif -%}
   3 {%+  include("zone-match.uc", { egress: true, rule }) -%}
   4 ct state invalid {%+ if (zone.counter): -%}
   5         counter {%+ endif -%}
   6 {%+ if (zone.log & 1): -%}
   7         log prefix "drop {{ zone.name }} invalid ct state: " {%+ endif -%}
   8 drop comment "!fw4: Prevent NAT leakage"