{ pkgs, lib, config, ... }:
let
  inherit (builtins) hasAttr readFile;
  inherit (pkgs.lib) unlinesAttrs;
  inherit (config) networking;
  inherit (config.users) users groups;
in
{
networking.firewall.enable = false;
systemd.services.disable-kernel-module-loading.after = [ "nftables.service" ];
systemd.services.nftables.serviceConfig.TimeoutStartSec = "20";
networking.nftables = {
  enable = true;
  ruleset = lib.mkBefore ''
    table inet filter {
      include "${../../../networking/nftables/filter.txt}"
      # A set containing the udp port(s) to which SSDP replies are allowed.
      set ssdp_out {
        type inet_service
        timeout 5s
      }
      chain net2fw {
        #udp dport mdns ip6 daddr ff02::fb counter accept comment "Accept mDNS"
        #udp dport mdns ip daddr 224.0.0.251 counter accept comment "Accept mDNS"
        #jump non-internet

        #ct state new add @connlimit { ip saddr ct count over 20 } counter tcp reject with tcp reset

        # Some .nix append rules here with: add rule inet filter net2fw ...
      }
      chain fw2net {
        tcp dport { 80, 443 } counter accept comment "HTTP"
        udp dport 123 skuid ${users.systemd-timesync.name} counter accept comment "NTP"
        tcp dport 1965 counter accept comment "Gemini"
        tcp dport 9418 counter accept comment "Git"

        # Some .nix append rules here with: add rule inet filter fw2net ...
      }

      chain input {
        type filter hook input priority filter
        policy drop

        iifname lo accept

        jump check-tcp
        ct state { established, related } accept
        jump accept-connectivity-input
        ct state invalid counter drop

        # admin services
        tcp dport 22 counter accept comment "SSH"
        udp dport 60000-61000 counter accept comment "Mosh"

        # Some .nix append gotos here with: add rule inet filter input iffname ... goto ...
      }
      chain forward {
        type filter hook forward priority filter
        policy drop

        #tcp flags syn tcp option maxseg size set rt mtu
        ct state { related, established } accept
        jump accept-connectivity-forward
      }
      chain output {
        type filter hook output priority filter
        policy drop

        oifname lo accept

        tcp flags syn tcp option maxseg size set rt mtu

        ct state { related, established } accept
        jump accept-connectivity-output

        tcp dport 22 counter accept comment "SSH"

        # Some .nix append gotos here with: add rule inet filter output oifname ... goto ...
      }
    }
    table inet nat {
      chain prerouting {
        type nat hook prerouting priority filter
        policy accept
      }
      chain postrouting {
        type nat hook postrouting priority srcnat
        policy accept
      }
    }
  '';
};
}