From ca287b95c9592d21a408b2436092bc7ffb251f4d Mon Sep 17 00:00:00 2001
From: Felix Albrigtsen <felix@albrigtsen.it>
Date: Sun, 28 Jul 2024 19:25:52 +0200
Subject: [PATCH] Ildkule/openstack: fix networking

Removes systemd-networkd, and configures proper ipv4 and ipv6 in
openstack.
---
 hosts/ildkule/configuration.nix | 41 +++++++++++++++++----------------
 misc/metrics-exporters.nix      |  2 --
 values.nix                      | 38 +++++++-----------------------
 3 files changed, 29 insertions(+), 52 deletions(-)

diff --git a/hosts/ildkule/configuration.nix b/hosts/ildkule/configuration.nix
index 557f498..c66d261 100644
--- a/hosts/ildkule/configuration.nix
+++ b/hosts/ildkule/configuration.nix
@@ -1,4 +1,4 @@
-{ config, pkgs, values, ... }:
+{ config, pkgs, lib, values, ... }:
 {
   imports = [
       # Include the results of the hardware scan.
@@ -19,27 +19,28 @@
   boot.tmp.cleanOnBoot = true;
   zramSwap.enable = true;
 
-  networking.hostName = "ildkule"; # Define your hostname.
+  # Openstack Neutron and systemd-networkd are not best friends, use something else:
+  systemd.network.enable = lib.mkForce false;
+  networking = let
+    hostConf = values.hosts.ildkule;
+  in {
+    hostName = "ildkule";
+    tempAddresses = "disabled";
+    useDHCP = lib.mkForce true;
 
-  # Main connection, using the global/floatig IP, for communications with the world
-  systemd.network.networks."30-ntnu-global" = values.openstackGlobalNetworkConfig // {
-    matchConfig.Name = "ens4";
+    search = values.defaultNetworkConfig.domains;
+    nameservers = values.defaultNetworkConfig.dns;
+    defaultGateway.address = hostConf.ipv4_internal_gw;
 
-    # Add the global addresses in addition to the local address learned from DHCP
-    addresses = [
-      { addressConfig.Address = "${values.hosts.ildkule.ipv4_global}/32"; }
-      { addressConfig.Address = "${values.hosts.ildkule.ipv6_global}/128"; }
-    ];
-  };
-
-  # Secondary connection only for use within the university network
-  systemd.network.networks."40-ntnu-internal" = values.openstackLocalNetworkConfig // {
-    matchConfig.Name = "ens3";
-    # Add the ntnu-internal addresses in addition to the local address learned from DHCP
-    addresses = [
-      { addressConfig.Address = "${values.hosts.ildkule.ipv4}/32"; }
-      { addressConfig.Address = "${values.hosts.ildkule.ipv6}/128"; }
-    ];
+    interfaces."ens4" = {
+      ipv4.addresses = [
+        { address = hostConf.ipv4;          prefixLength = 32; }
+        { address = hostConf.ipv4_internal; prefixLength = 24; }
+      ];
+      ipv6.addresses = [
+        { address = hostConf.ipv6;          prefixLength = 64; }
+      ];
+    };
   };
 
   # List packages installed in system profile
diff --git a/misc/metrics-exporters.nix b/misc/metrics-exporters.nix
index 4ee67e8..fed7c34 100644
--- a/misc/metrics-exporters.nix
+++ b/misc/metrics-exporters.nix
@@ -14,8 +14,6 @@
       "::1"
       values.hosts.ildkule.ipv4
       values.hosts.ildkule.ipv6
-      values.hosts.ildkule.ipv4_global
-      values.hosts.ildkule.ipv6_global
     ];
   };
 
diff --git a/values.nix b/values.nix
index 2e11f4f..bfb8785 100644
--- a/values.nix
+++ b/values.nix
@@ -30,11 +30,10 @@ in rec {
       ipv6 = pvv-ipv6 168;
     };
     ildkule = {
-      ipv4 = "10.212.25.209";
-      ipv6 = "2001:700:300:6025:f816:3eff:feee:812d";
-
-      ipv4_global = "129.241.153.213";
-      ipv6_global = "2001:700:300:6026:f816:3eff:fe58:f1e8";
+      ipv4 = "129.241.153.213";
+      ipv4_internal = "192.168.12.209";
+      ipv4_internal_gw = "192.168.12.1";
+      ipv6 = "2001:700:300:6026:f816:3eff:fe58:f1e8";
     };
     bicep = {
       ipv4 = pvv-ipv4 209;
@@ -66,32 +65,11 @@ in rec {
   };
 
   defaultNetworkConfig = {
-    networkConfig.IPv6AcceptRA = "no";
-    gateway = [ hosts.gateway ];
-    dns = [ "129.241.0.200" "129.241.0.201" ];
+    dns = [ "129.241.0.200" "129.241.0.201" "2001:700:300:1900::200" "2001:700:300:1900::201" ];
     domains = [ "pvv.ntnu.no" "pvv.org" ];
+    gateway = [ hosts.gateway ];
+
+    networkConfig.IPv6AcceptRA = "no";
     DHCP = "no";
   };
-
-  openstackGlobalNetworkConfig = {
-    networkConfig.IPv6AcceptRA = "yes";
-    dns = [ "129.241.0.200" "129.241.0.201" ];
-    domains = [ "pvv.ntnu.no" "pvv.org" ];
-    DHCP = "yes";
-  };
-
-  openstackLocalNetworkConfig = {
-    networkConfig.IPv6AcceptRA = "no";
-    dns = [ "129.241.0.200" "129.241.0.201" ];
-    domains = [ "pvv.ntnu.no" "pvv.org" ];
-    DHCP = "yes";
-
-    # Only use this network for link-local networking, not global/default routes
-    dhcpV4Config.UseRoutes = "no";
-    routes = [
-      { routeConfig = { Destination = "10.0.0.0/8"; Gateway = "_dhcp4"; }; }
-    ];
-
-    linkConfig.RequiredForOnline = "no";
-  };
 }