Enable 464CLAT on acer

2026-06-13 02:45:21 +02:00
parent 61c113dcd0
commit 708d132730
8 changed files with 357 additions and 0 deletions
@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+
+# IPv6-mostly support via NetworkManager (RFC 8925 + RFC 6877 / 464XLAT).
+# Requires NetworkManager >= 1.58 (pkgs.networkmanager-clat in practice).
+# Sets ipv4.clat=auto and ipv4.dhcp-ipv6-only-preferred=auto as connection
+# defaults, mirroring the Fedora 45 change:
+# https://fedoraproject.org/wiki/Changes/IPv6-Mostly_Support_In_NetworkManager
+{
+  options.lumpiasty.ipv6Mostly = lib.mkEnableOption "Enable IPv6-mostly (RFC 8925 + CLAT/464XLAT) support in NetworkManager";
+
+  config = lib.mkIf config.lumpiasty.ipv6Mostly {
+    # Use the patched NM build with CLAT support, without replacing pkgs.networkmanager
+    # globally (which would cascade rebuilds across the entire system closure).
+    networking.networkmanager.package = pkgs.networkmanager-clat;
+
+    # Drop a conf.d snippet that sets connection-level defaults.
+    # NM reads /etc/NetworkManager/conf.d/*.conf in addition to NetworkManager.conf.
+    environment.etc."NetworkManager/conf.d/99-ipv6-mostly.conf".text = ''
+      # IPv6-mostly: automatically enable CLAT (464XLAT) and DHCPv4 option 108
+      # when the network advertises PREF64 and/or option 108 (RFC 8925).
+      # On networks without these, behaviour is unchanged (native IPv4 proceeds).
+      [connection-defaults]
+      ipv4.clat=auto
+      ipv4.dhcp-ipv6-only-preferred=auto
+    '';
+  };
+}