liminix/examples/rotuer.nix

# This is an example that uses the "gateway" profile to create a
# "typical home wireless router" configuration suitable for a Gl.inet
# gl-ar750 router. It should be fairly simple to edit it for other
# devices: mostly you will need to attend to the number of wlan and lan
# interfaces

{
  config,
  pkgs,
  lib,
  modulesPath,
  ...
}:
let
  secrets = {
    domainName = "fake.liminix.org";
    firewallRules = { };
  } // (import ./rotuer-secrets.nix);
  svc = config.system.service;
  wirelessConfig = {
    country_code = "GB";
    inherit (secrets) wpa_passphrase;
    wmm_enabled = 1;
  };

in
rec {
  boot = {
    tftp = {
      freeSpaceBytes = 3 * 1024 * 1024;
      serverip = "10.0.0.1";
      ipaddr = "10.0.0.8";
    };
  };

  imports = [
    "${modulesPath}/profiles/gateway.nix"
  ];
  hostname = "rotuer";

  profile.gateway = {
    lan = {
      interfaces = with config.hardware.networkInterfaces; [
        # EDIT: these are the interfaces exposed by the gl.inet gl-ar750:
        # if your device has more or differently named lan interfaces,
        # specify them here
        wlan
        wlan5
        lan
      ];
      inherit (secrets.lan) prefix;
      address = {
        family = "inet";
        address = "${secrets.lan.prefix}.1";
        prefixLength = 24;
      };
      dhcp = {
        start = 10;
        end = 240;
        hosts =
          { }
          // lib.optionalAttrs (builtins.pathExists ./static-leases.nix) (import ./static-leases.nix);
        localDomain = "lan";
      };
    };
    wan = {
      # wan interface depends on your upstream - could be dhcp, static
      # ethernet, a pppoe, ppp over serial, a complicated bonded
      # failover ... who knows what else?
      interface = svc.pppoe.build {
        interface = config.hardware.networkInterfaces.wan;
        username = secrets.l2tp.name;
        password = secrets.l2tp.password;
      };
      # once the wan has ipv4 connnectivity, should we run dhcp6
      # client to potentially get an address range ("prefix
      # delegation")
      dhcp6.enable = true;
    };
    firewall = {
      enable = true;
      rules = secrets.firewallRules;
    };
    wireless.networks = {
      # EDIT: if you have more or fewer wireless radios, here is where
      # you need to say so.  hostapd tuning is hardware-specific and
      # left as an exercise for the reader :-).

      "${secrets.ssid}" = {
        interface = config.hardware.networkInterfaces.wlan;
        hw_mode = "g";
        channel = "2";
        ieee80211n = 1;
      } // wirelessConfig;
      "${secrets.ssid}5" = rec {
        interface = config.hardware.networkInterfaces.wlan5;
        hw_mode = "a";
        channel = 36;
        ht_capab = "[HT40+]";
        vht_oper_chwidth = 1;
        vht_oper_centr_freq_seg0_idx = channel + 6;
        ieee80211n = 1;
        ieee80211ac = 1;
      } // wirelessConfig;
    };
  };

  services.ntp = svc.ntp.build {
    pools = {
      "pool.ntp.org" = [ "iburst" ];
    };
    makestep = {
      threshold = 1.0;
      limit = 3;
    };
  };

  services.sshd = svc.ssh.build { };

  users.root = secrets.root;

  defaultProfile.packages = with pkgs; [
    min-collect-garbage
    nftables
    strace
    tcpdump
    s6
  ];

  programs.busybox = {
    applets = [
      "fdisk"
      "sfdisk"
    ];
    options = {
      FEATURE_FANCY_TAIL = "y";
    };
  };
}