1 files changed, 42 insertions, 3 deletions
diff --git a/nixpkgs/nixos/modules/services/networking/corerad.nix b/nixpkgs/nixos/modules/services/networking/corerad.nix
index 1a2c4aec6651..5d73c0a0d779 100644
--- a/nixpkgs/nixos/modules/services/networking/corerad.nix
+++ b/nixpkgs/nixos/modules/services/networking/corerad.nix
@@ -4,14 +4,50 @@ with lib;
 
 let
   cfg = config.services.corerad;
+
+  writeTOML = name: x:
+    pkgs.runCommandNoCCLocal name {
+      passAsFile = ["config"];
+      config = builtins.toJSON x;
+      buildInputs = [ pkgs.go-toml ];
+    } "jsontoml < $configPath > $out";
+
 in {
-  meta = {
-    maintainers = with maintainers; [ mdlayher ];
-  };
+  meta.maintainers = with maintainers; [ mdlayher ];
 
   options.services.corerad = {
     enable = mkEnableOption "CoreRAD IPv6 NDP RA daemon";
 
+    settings = mkOption {
+      type = types.uniq types.attrs;
+      example = literalExample ''
+        {
+          interfaces = [
+            # eth0 is an upstream interface monitoring for IPv6 router advertisements.
+            {
+              name = "eth0";
+              monitor = true;
+            }
+            # eth1 is a downstream interface advertising IPv6 prefixes for SLAAC.
+            {
+              name = "eth1";
+              advertise = true;
+              prefix = [{ prefix = "::/64"; }];
+            }
+          ];
+          # Optionally enable Prometheus metrics.
+          debug = {
+            address = "localhost:9430";
+            prometheus = true;
+          };
+        }
+      '';
+      description = ''
+        Configuration for CoreRAD, see <link xlink:href="https://github.com/mdlayher/corerad/blob/master/internal/config/default.toml"/>
+        for supported values. Ignored if configFile is set.
+      '';
+    };
+
     configFile = mkOption {
       type = types.path;
       example = literalExample "\"\${pkgs.corerad}/etc/corerad/corerad.toml\"";
@@ -27,6 +63,9 @@ in {
   };
 
   config = mkIf cfg.enable {
+    # Prefer the config file over settings if both are set.
+    services.corerad.configFile = mkDefault (writeTOML "corerad.toml" cfg.settings);
+
     systemd.services.corerad = {
       description = "CoreRAD IPv6 NDP RA daemon";
       after = [ "network.target" ];