{ config, pkgs, lib, ... }:

{
  imports =
    [
      ./hardware-configuration.nix
      ../../configuration/router
    ];

  boot.kernelParams = [ "console=ttyS0,115200n8" ];

  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "/dev/sda";
  boot.loader.grub.extraConfig = "
    serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
    terminal_input serial
    terminal_output serial
  ";

  networking.hostName = "carbon";

  networking.useDHCP = false;
  # Local Router IPs
  networking.interfaces.lo.ipv6.addresses = [
    { address = "fd00:152:152::1"; prefixLength = 128; } # Anycast
  ];
  networking.interfaces.lo.ipv4.addresses = [
    { address = "10.152.0.1"; prefixLength = 32; } # Anycast
  ];
  # Network
  ## DSL-Uplink
  networking.vlans."enp1s0.7" = {
    id = 7;
    interface = "enp1s0";
  };
  ## LTE-Uplink
  networking.vlans."enp1s0.102" = {
    id = 102;
    interface = "enp1s0";
  };
  ## Heimnetz
  networking.vlans."enp1s0.201" = {
    id = 201;
    interface = "enp1s0";
  };
  networking.interfaces."enp1s0.201".ipv6.addresses = [
    { address = "fe80::1"; prefixLength = 64; }
    { address = "fd00:152:152:4::1"; prefixLength = 64; }
    { address = "2001:4cd8:100:1337::1"; prefixLength = 64; } # public IPs for local network
  ];
  networking.interfaces."enp1s0.201".ipv4.addresses = [
    { address = "10.152.4.1"; prefixLength = 24; }
  ];
  ## Gastnetz
  networking.vlans."enp1s0.202" = {
    id = 202;
    interface = "enp1s0";
  };
  networking.interfaces."enp1s0.202".ipv6.addresses = [
    { address = "fd00:3214:9453:4920::1"; prefixLength = 64; }
    { address = "2001:4cd8:100:1313::1"; prefixLength = 64; } # public IPs for local network
  ];
  networking.interfaces."enp1s0.202".ipv4.addresses = [
    { address = "192.168.32.1"; prefixLength = 24; }
  ];
  ## VoIP
  networking.vlans."enp1s0.204" = {
    id = 204;
    interface = "enp1s0";
  };
  networking.interfaces."enp1s0.204".ipv4.addresses = [
    { address = "10.152.33.1"; prefixLength = 24; }
  ];
  # Use Anycast Nameservers
  networking.nameservers = [ "fd00:152:152::1" "10.152.0.1" ];

  networking.nat = {
    enableIPv6 = true;
    enable = true;
    externalInterface = "ppp-ntvdsl";
    internalIPv6s = [ "fd00:152:152::/48" "fd00:3214:9453:4920::/64"];
    internalIPs = [ "10.152.0.0/16" "192.168.32.0/24" ];
  };

  services.radvd.enable = true;
  services.radvd.config = ''
    interface enp1s0.201 {
      AdvSendAdvert on;
      prefix 2001:4cd8:100:1337::/64 {};
      RDNSS fd00:152:152::1 {};
      DNSSL net.clerie.de {};
    };
    interface enp1s0.202 {
      AdvSendAdvert on;
      prefix 2001:4cd8:100:1313::/64 {};
      RDNSS 2620:fe::fe 2620:fe::9 {}; # Quad 9
    };
  '';

  services.kea.dhcp4 = {
    enable = true;
    settings = {
      interfaces-config = {
        interfaces = [ "enp1s0.201" "enp1s0.202" "enp1s0.204" ];
      };
      lease-database = {
        name = "/var/lib/kea/dhcp4.leases";
        persist = true;
        type = "memfile";
      };
      option-def = [
        {
          space = "dhcp4";
          name = "vendor-encapsulated-options";
          code = 43;
          type = "empty";
          encapsulate = "sipdect";
        }
        {
          space = "sipdect";
          name = "ommip1";
          code = 10;
          type = "ipv4-address";
        }
        {
          space = "sipdect";
          name = "ommip2";
          code = 19;
          type = "ipv4-address";
        }
        {
          space = "sipdect";
          name = "syslogip";
          code = 14;
          type = "ipv4-address";
        }
        {
          space = "sipdect";
          name = "syslogport";
          code = 15;
          type = "int16";
        }
        {
          space = "dhcp4";
          name = "magic_str";
          code = 224;
          type = "string";
        }
      ];
      subnet4 = [
        # Heimnetz
        {
          id = 201;
          subnet = "10.152.4.0/24";
          pools = [
            {
              pool = "10.152.4.100 - 10.152.4.240";
            }
          ];
          option-data = [
            {
              name = "routers";
              data = "10.152.4.1";
            }
            {
              name = "domain-name-servers";
              data = "10.152.0.1";
            }
            {
              name = "domain-name";
              data = "net.clerie.de";
            }
          ];
        }
        # Gastnetz
        {
          id = 202;
          subnet = "192.168.32.0/24";
          pools = [
            {
              pool = "192.168.32.100 - 192.168.32.240";
            }
          ];
          option-data = [
            {
              name = "routers";
              data = "192.168.32.1";
            }
            {
              name = "domain-name-servers";
              data = "9.9.9.9,149.112.112.112"; # Quad 9
            }
          ];
        }
        # VoIP
        {
          id = 204;
          subnet = "10.152.33.0/24";
          pools = [
            {
              pool = "10.152.33.10 - 10.152.33.200";
            }
          ];
          option-data = [
            {
              name = "routers";
              data = "10.152.33.1";
            }
          ];

          reservations = [
            {
              hostname = "iridium";
              hw-address = "00:30:42:1B:8C:7C";
              ip-address = "10.152.33.11";
              option-data = [
                {
                  name = "host-name";
                  data = "iridium";
                }
                {
                  name = "vendor-encapsulated-options";
                }
                {
                  space = "sipdect";
                  name = "ommip1";
                  data = "10.152.33.11";
                }
                {
                  name = "magic_str";
                  data = "OpenMobilitySIP-DECT";
                }
              ];
            }
          ];
        }
      ];
    };
  };

  networking.firewall.allowedUDPPorts = [ 53 ];
  networking.firewall.allowedTCPPorts = [ 53 ];

  clerie.firewall.enable = true;
  clerie.firewall.extraForwardFilterCommands = ''
    ip46tables -A forward-filter -i enp1s0.202 -o ppp-ntvdsl -j ACCEPT
    ip46tables -A forward-filter -i enp1s0.202 -j DROP
    ip46tables -A forward-filter -o enp1s0.202 -j DROP
  '';
  clerie.firewall.extraForwardMangleCommands = ''
    ip46tables -t mangle -A forward-mangle -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1452
  '';

  services.pppd = {
    enable = true;
    peers.ntvdsl = {
      config = ''
        plugin rp-pppoe.so enp1s0.7
        user "dsl-31997-001#regio@bsa-vdsl"
        ifname ppp-ntvdsl
        persist
        maxfail 0
        holdoff 5
        noipdefault
        lcp-echo-interval 20
        lcp-echo-failure 3
        mtu 1492
        hide-password
        defaultroute
        +ipv6
        debug
      '';
    };
  };


  clerie.monitoring = {
    enable = true;
    id = "104";
    pubkey = "sro9DUSMtVr5xV2o3GTgg+0vmLj+bRc8fN+3pIr6+HY=";
    blackbox = true;
  };

  services.unbound = {
    enable = true;
    resolveLocalQueries = false;
    settings = {
      server = {
        interface = [ "fd00:152:152::1" "10.152.0.1" ];
        access-control = [ "::/0 allow" "0.0.0.0/0 allow" ];
        prefer-ip6 = true;
        prefetch = true;
        serve-expired = true;
        serve-expired-ttl-reset = true;
      };
    };
  };

  system.stateVersion = "21.03";
}