add guest network (now with custom mac address generators!)

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

lib/default.nix

@@ -57,5 +57,30 @@
     # type:
     # fileList :: Path -> String -> [Path]
     fileList = dir: map (file: dir + "/${file}") (ls dir);
+
+    # constructs a mac address from a string's hash
+    #
+    # args:
+    # hashable: the string to hash
+    #
+    # type:
+    # strToMac :: String -> String
+    strToMac =
+      hashable:
+      let
+        # computes sha512 hash of input
+        hashStr = builtins.hashString "sha512" hashable;
+        # grabs first 12 letters of hash
+        hashSub = start: builtins.substring start 2 (builtins.substring 0 12 hashStr);
+        # joins list of strings with a delimiter between
+        joiner =
+          delim: arr:
+          builtins.foldl' (
+            a: b: lib.concatStrings ([ a ] ++ (lib.optionals (a != "") [ delim ]) ++ [ b ])
+          ) "" arr;
+        # generates a list of indexes for the hash
+        starts = builtins.genList (x: x * 2) 6;
+      in
+      joiner ":" (map hashSub starts);
   };
 }

lib/microvms.nix

@@ -5,15 +5,18 @@ rec {
     lib.mapAttrs (
       host:
       {
-        ipv4,
+        address,
+        gateway,
         machine-id,
         server ? false,
       }:
-      genMicroVM host ipv4 "x86_64-linux" machine-id (if server then server-config else agent-config)
+      genMicroVM host address gateway "x86_64-linux" machine-id (
+        if server then server-config else agent-config
+      )
     ) vms;
 
   genMicroVM =
-    hostName: ipv4: _system: machine-id: vm-config:
+    hostName: address: gateway: _system: machine-id: vm-config:
     # microvm refers to microvm.nixosModules
 
     # {
@@ -44,32 +47,47 @@ rec {
           text = machine-id + "\n";
         };
 
-        microvm.shares = [
-          {
-            source = "/nix/store";
-            mountPoint = "/nix/.ro-store";
-            tag = "ro-store";
-            proto = "virtiofs";
-          }
-          {
-            # On the host
-            source = "/var/lib/microvms/${hostName}/journal";
-            # In the MicroVM
-            mountPoint = "/var/log/journal";
-            tag = "journal";
-            proto = "virtiofs";
-            socket = "journal.sock";
-          }
-        ];
+        networking.hostName = hostName;
 
-        networking = {
-          inherit hostName;
-          interfaces.ether.ipv4.addresses = [
+        microvm = {
+          interfaces = [
             {
-              address = ipv4;
-              prefixLength = 32;
+              type = "tap";
+              # bridge = "ztkubnet";
+              id = "vm-${hostName}";
+              mac = lib.rad-dev.strToMac hostName;
             }
           ];
+          shares = [
+            {
+              source = "/nix/store";
+              mountPoint = "/nix/.ro-store";
+              tag = "ro-store";
+              proto = "virtiofs";
+            }
+            {
+              # On the host
+              source = "/var/lib/microvms/${hostName}/journal";
+              # In the MicroVM
+              mountPoint = "/var/log/journal";
+              tag = "journal";
+              proto = "virtiofs";
+              socket = "journal.sock";
+            }
+          ];
+        };
+
+        systemd.network.enable = true;
+
+        systemd.network.networks."20-lan" = {
+          matchConfig.Type = "ether";
+          networkConfig = {
+            Address = address;
+            Gateway = gateway;
+            DNS = [ "9.9.9.9" ];
+            IPv6AcceptRA = true;
+            DHCP = "no";
+          };
         };
 
         services.openssh = {

modules/kub_net.nix

@@ -38,7 +38,10 @@ in
       };
       networks = {
         "30-ztkubnet" = {
-          matchConfig.Name = "ztkubnet";
+          matchConfig.Name = [
+            "ztkubnet"
+            "vm-*"
+          ];
           networkConfig.Bridge = "brkubnet";
           linkConfig.RequiredForOnline = "enslaved";
         };

systems/palatine-hill/microvms.nix

@@ -15,7 +15,8 @@ in
     genK3SVM (src + "/modules/opt/k3s-server.nix") (src + "/modules/opt/k3s-agent.nix")
       {
         "ph-server-1" = {
-          ipv4 = "192.168.69.10";
+          address = [ "192.168.69.10/24" ];
+          gateway = "192.168.69.1";
           machine-id = "d694ad1e88b356887bb204ac665263f7";
           server = true;
         };