add basic ap stuff: hostapd, dhcpd

1 files changed, 100 insertions, 8 deletions

diff --git a/config/networking/default.nix b/config/networking/default.nix
index 9dac00f..330ba3b 100644
--- a/config/networking/default.nix
+++ b/config/networking/default.nix
@@ -1,13 +1,105 @@
-{ pkgs, ... }:
+# https://skogsbrus.xyz/blog/2022/06/12/router/
+# https://blog.fraggod.net/2017/04/27/wifi-hostapd-configuration-for-80211ac-networks.html
+{ config, lib, pkgs, secrets, ... }:
 
-{
-  personal.networking = {
-    enable = true;
-    ssh.enable = true;
+let
+  ifaces = config.personal.networking.interfaces;
+  publicSubnet = "192.168.1";
+  privateSubnet = "192.168.2";
+in {
+  imports = [ ./hostapd.nix ];
+
+  options.personal.networking = {
+    interfaces = let
+      makeInterfaceOption = type:
+        lib.mkOption {
+          type = lib.types.str;
+          description = "Network device for the ${type} interface.";
+          example = "enp4s0";
+        };
+    in {
+      eth = makeInterfaceOption "ethernet";
+      wlp2ghz = makeInterfaceOption "2 GHz WiFi";
+      wlp5ghz = makeInterfaceOption "5 GHz WiFi";
+    };
   };
 
-  networking = {
-    hostName = "kerberos";
-    domain = "local";
+  config = {
+    personal.networking = {
+      enable = true;
+      ssh.enable = true;
+      interfaces = {
+        eth = "enp4s0";
+        wlp2ghz = "wlp5s0";
+        wlp5ghz = "wlp1s0";
+      };
+    };
+
+    networking = {
+      hostName = "kerberos";
+      domain = "local";
+
+      defaultGateway = {
+        address = "${publicSubnet}.1";
+        interface = ifaces.eth;
+      };
+
+      dhcpcd.enable = false;
+      interfaces = {
+        "${ifaces.eth}" = {
+          ipv4.addresses = [{
+            address = "${publicSubnet}.2";
+            prefixLength = 24;
+          }];
+        };
+        "${ifaces.wlp5ghz}" = {
+          ipv4.addresses = [{
+            address = "${privateSubnet}.1";
+            prefixLength = 24;
+          }];
+        };
+      };
+
+      nat = {
+        enable = true;
+        externalInterface = ifaces.eth;
+        internalInterfaces = [
+          # ifaces.wlp2ghz
+          ifaces.wlp5ghz
+        ];
+      };
+
+      firewall.interfaces."${ifaces.wlp5ghz}" = {
+        allowedTCPPorts = [ 53 ];
+        allowedUDPPorts = [ 53 ];
+      };
+    };
+
+    services.dhcpd4 = {
+      enable = true;
+      extraConfig = ''
+        option subnet-mask 255.255.255.0;
+        option routers ${privateSubnet}.1;
+        option domain-name-servers ${privateSubnet}.1, 9.9.9.9;
+        subnet ${privateSubnet}.0 netmask 255.255.255.0 {
+            range ${privateSubnet}.10 ${privateSubnet}.99;
+        }
+      '';
+      interfaces = [ ifaces.wlp5ghz ];
+    };
+
+    services.unbound = {
+      enable = true;
+      settings = {
+        server = {
+          interface = [ "127.0.0.1" "${privateSubnet}.1" ];
+          access-control = [
+            "0.0.0.0/0 refuse"
+            "127.0.0.0/8 allow"
+            "${privateSubnet}.0/24 allow"
+          ];
+        };
+      };
+    };
   };
 }