miaou-server/templates/nftables/lxd.table.j2

table inet lxd {
    chain pstrt.lxdbr0 {
        type nat hook postrouting priority srcnat; policy accept;

        {%- if target != 'prod' %}
        # BLOCK SMTP PORTS
        tcp dport { 25, 465, 587 } ip saddr {{ firewall.bridge_subnet }} {%- if firewall.container_mail_passthrough %} ip saddr != {{ env.ip_mail_passthrough }} {% endif %} log prefix "Drop SMTP away from container: " drop
        {% endif -%}

        ip saddr {{ firewall.bridge_subnet }} ip daddr != {{ firewall.bridge_subnet }} masquerade
    }

    chain fwd.lxdbr0 {
        type filter hook forward priority filter; policy accept;
        ip version 4 oifname "lxdbr0" accept
        ip version 4 iifname "lxdbr0" accept
    }

    chain in.lxdbr0 {
        type filter hook input priority filter; policy accept;
        iifname "lxdbr0" tcp dport 53 accept
        iifname "lxdbr0" udp dport 53 accept
        iifname "lxdbr0" icmp type { destination-unreachable, time-exceeded, parameter-problem } accept
        iifname "lxdbr0" udp dport 67 accept
    }

    chain out.lxdbr0 {
        type filter hook output priority filter; policy accept;
        oifname "lxdbr0" tcp sport 53 accept
        oifname "lxdbr0" udp sport 53 accept
        oifname "lxdbr0" icmp type { destination-unreachable, time-exceeded, parameter-problem } accept
        oifname "lxdbr0" udp sport 67 accept
    }
}