nixos/network-interfaces: Add maclvan support

nixos/modules/tasks/network-interfaces-scripted.nix

@@ -250,6 +250,29 @@ in
             postStop = destroyBond n;
           });
 
+        createMacvlanDevice = n: v: nameValuePair "${n}-netdev"
+          (let
+            deps = [ (subsystemDevice v.interface) ];
+          in
+          { description = "Vlan Interface ${n}";
+            wantedBy = [ "network.target" (subsystemDevice n) ];
+            bindsTo = deps;
+            after = deps;
+            serviceConfig.Type = "oneshot";
+            serviceConfig.RemainAfterExit = true;
+            path = [ pkgs.iproute ];
+            script = ''
+              # Remove Dead Interfaces
+              ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
+              ip link add link "${v.interface}" name "${n}" type macvlan \
+                ${optionalString (v.mode != null) "mode ${v.mode}"}
+              ip link set "${n}" up
+            '';
+            postStop = ''
+              ip link delete "${n}"
+            '';
+          });
+
         createSitDevice = n: v: nameValuePair "${n}-netdev"
           (let
             deps = optional (v.dev != null) (subsystemDevice v.dev);
@@ -303,6 +326,7 @@ in
            map createTunDevice (filter (i: i.virtual) interfaces))
          // mapAttrs' createBridgeDevice cfg.bridges
          // mapAttrs' createBondDevice cfg.bonds
+         // mapAttrs' createMacvlanDevice cfg.macvlans
          // mapAttrs' createSitDevice cfg.sits
          // mapAttrs' createVlanDevice cfg.vlans
          // {

nixos/modules/tasks/network-interfaces-systemd.nix

@@ -118,6 +118,18 @@ in
             networkConfig.Bond = name;
           } ])));
       })))
+      (mkMerge (flip mapAttrsToList cfg.macvlans (name: macvlan: {
+        netdevs."40-${name}" = {
+          netdevConfig = {
+            Name = name;
+            Kind = "macvlan";
+          };
+          macvlanConfig.Mode = macvlan.mode;
+        };
+        networks."40-${macvlan.interface}" = (mkMerge [ (genericNetwork (mkOverride 999)) {
+          macvlan = [ name ];
+        } ]);
+      })))
       (mkMerge (flip mapAttrsToList cfg.sits (name: sit: {
         netdevs."40-${name}" = {
           netdevConfig = {

nixos/modules/tasks/network-interfaces.nix

@@ -428,6 +428,37 @@ in
       };
     };
 
+    networking.macvlans = mkOption {
+      type = types.attrsOf types.optionSet;
+      default = { };
+      example = {
+        wan = {
+          interface = "enp2s0";
+          mode = "vepa";
+        };
+      };
+      description = ''
+        This option allows you to define macvlan interfaces which should
+        be automatically created.
+      '';
+      options = {
+
+        interface = mkOption {
+          example = "enp4s0";
+          type = types.string;
+          description = "The interface the macvlan will transmit packets through.";
+        };
+
+        mode = mkOption {
+          default = null;
+          type = types.nullOr types.str;
+          example = "vepa";
+          description = "The mode of the macvlan device.";
+        };
+
+      };
+    };
+
     networking.sits = mkOption {
       type = types.attrsOf types.optionSet;
       default = { };