this is the dhcp6c service we want

modules/dhcp6c/default.nix

@@ -0,0 +1,52 @@
+## DHCP6 client module
+## ===================
+##
+##  This is for use if you have an IPv6-capable upstream that provides
+##  address information and/or prefix delegation using DHCP6. It
+##  provides a service to request address information in the form of a
+##  DHCP lease, and two dependent services that listen for updates
+##  to the DHCP address information and can be used to update
+##  addresses of network interfaces that you want to assign those
+##  prefixes to
+
+{ lib, pkgs, config, ...}:
+let
+  inherit (lib) mkOption types;
+  inherit (pkgs.liminix.services) oneshot;
+  inherit (pkgs) liminix;
+in
+{
+  options = {
+    system.service.dhcp6c = {
+      client = mkOption { type = liminix.lib.types.serviceDefn; };
+      prefix = mkOption { type = liminix.lib.types.serviceDefn; };
+      address = mkOption { type = liminix.lib.types.serviceDefn; };
+    };
+  };
+  config.system.service.dhcp6c = {
+    client = liminix.callService ./client.nix {
+      interface = mkOption {
+        type = liminix.lib.types.interface;
+        description = "interface (usually WAN) to query for DHCP6";
+      };
+    };
+    address = liminix.callService ./address.nix {
+      client = mkOption {
+        type = types.anything; # liminix.lib.types.service;
+      };
+      interface = mkOption {
+        type = liminix.lib.types.interface;
+        description = "interface to assign the address to";
+      };
+    };
+    prefix = liminix.callService ./prefix.nix {
+      client = mkOption {
+        type = types.anything; # liminix.lib.types.service;
+      };
+      interface = mkOption {
+        type = liminix.lib.types.interface;
+        description = "interface to assign <prefix>::1 to";
+      };
+    };
+  };
+}