From b900e797ea557030edb8350bbf732c061f23c7a0 Mon Sep 17 00:00:00 2001
From: Collin Williams <96917990+bluedragon1221@users.noreply.github.com>
Date: Sat, 27 Dec 2025 08:55:26 -0600
Subject: module for setting a static ip with systemd-networkd

---
 modules/services/nixos/networking/default.nix |  1 +
 modules/services/nixos/networking/static.nix  | 40 +++++++++++++++++++++++++++
 modules/services/options.nix                  | 16 +++++++++--
 3 files changed, 55 insertions(+), 2 deletions(-)
 create mode 100644 modules/services/nixos/networking/static.nix

(limited to 'modules')

diff --git a/modules/services/nixos/networking/default.nix b/modules/services/nixos/networking/default.nix
index 929578d..42cab1e 100644
--- a/modules/services/nixos/networking/default.nix
+++ b/modules/services/nixos/networking/default.nix
@@ -2,6 +2,7 @@
   imports = [
     ./iwd.nix
     ./networkmanager.nix
+    ./static.nix
   ];
 
   config = {
diff --git a/modules/services/nixos/networking/static.nix b/modules/services/nixos/networking/static.nix
new file mode 100644
index 0000000..9338a6a
--- /dev/null
+++ b/modules/services/nixos/networking/static.nix
@@ -0,0 +1,40 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  cfg = config.collinux.services.networking.static;
+in
+  lib.mkIf cfg.enable {
+    networking = {
+      wireless = {
+        enable = true;
+        networks.${cfg.ssid}.pskRaw = "ext:psk";
+        secretsFile = config.age.secrets.${cfg.pskFile}.path;
+      };
+
+      # Disable default networking stuff
+      dhcpcd.enable = false;
+      useDHCP = false;
+      networkmanager.enable = false;
+    };
+
+    systemd.network = {
+      enable = true;
+      networks."10-static-lan" = {
+        name = "wl*";
+
+        networkConfig = {
+          Address = "${cfg.ip}/24";
+          Gateway = cfg.gateway;
+          DNS = "1.1.1.1";
+          DHCP = "no";
+
+          # diable ipv6 addresses
+          IPv6AcceptRA = "no";
+          IPv6PrivacyExtensions = "no";
+          LinkLocalAddressing = "no";
+        };
+      };
+    };
+  }
diff --git a/modules/services/options.nix b/modules/services/options.nix
index 681ed99..78a5a8f 100644
--- a/modules/services/options.nix
+++ b/modules/services/options.nix
@@ -11,6 +11,18 @@ in {
         enable = mkEnableOption "wifi";
         iwd.enable = mkEnableOption "lightweight wifi daemon";
         networkmanager.enable = mkEnableOption "heavier wifi daemon";
+
+        static = let
+          ip_addr =
+            lib.types.strMatching
+            "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$";
+        in {
+          enable = mkEnableOption "set static IP (systemd-networkd)";
+          ssid = mkOption {type = lib.types.str;};
+          ip = mkOption {type = ip_addr;};
+          gateway = mkOption {type = ip_addr;};
+          pskFile = mkOption {type = lib.types.str;};
+        };
         tailscale.enable = mkEnableOption "tailscale";
         sshd.enable = mkEnableOption "OpenSSH server";
       };
@@ -42,8 +54,8 @@ in {
   config = {
     assertions = [
       {
-        assertion = with config.collinux.services.networking; !(iwd.enable && networkmanager.enable);
-        message = "can not use iwd and networkmanager at the same time";
+        assertion = with config.collinux.services.networking; (iwd.enable && !networkmanager.enable && !static.enable) || (!iwd.enable && networkmanager.enable && !static.enable) || (!iwd.enable && !networkmanager.enable && static.enable);
+        message = "only one networking method (iwd, networkmanager, static) can be active";
       }
     ];
   };
-- 
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