nixos/network-interfaces: add networking.interfaces.<name>.ipv[46].routes.type

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

@@ -219,14 +219,15 @@ let
                     cidr = "${route.address}/${toString route.prefixLength}";
                     via = optionalString (route.via != null) ''via "${route.via}"'';
                     options = concatStrings (mapAttrsToList (name: val: "${name} ${val} ") route.options);
+                    type = toString route.type;
                   in
                   ''
                      echo "${cidr}" >> $state
                      echo -n "adding route ${cidr}... "
-                     if out=$(ip route add "${cidr}" ${options} ${via} dev "${i.name}" proto static 2>&1); then
+                     if out=$(ip route add ${type} "${cidr}" ${options} ${via} dev "${i.name}" proto static 2>&1); then
                        echo "done"
                      elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
-                       echo "'ip route add "${cidr}" ${options} ${via} dev "${i.name}"' failed: $out"
+                       echo "'ip route add ${type} "${cidr}" ${options} ${via} dev "${i.name}"' failed: $out"
                        exit 1
                      fi
                   ''

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

@@ -142,6 +142,9 @@ in
                 optionalAttrs (route.via != null) {
                   Gateway = route.via;
                 } //
+                optionalAttrs (route.type != null) {
+                  Type = route.type;
+                } //
                 optionalAttrs (route.options ? onlink) {
                   GatewayOnLink = true;
                 } //

nixos/modules/tasks/network-interfaces.nix

@@ -90,6 +90,22 @@ let
         '';
       };
 
+      type = mkOption {
+        type = types.nullOr (types.enum [
+          "unicast" "local" "broadcast" "multicast"
+        ]);
+        default = null;
+        description = ''
+          Type of the route.  See the <literal>Route types</literal> section
+          in the <literal>ip-route(8)</literal> manual page for the details.
+
+          Note that <literal>prohibit</literal>, <literal>blackhole</literal>,
+          <literal>unreachable</literal>, and <literal>throw</literal> cannot
+          be configured per device, so they are not available here. Similarly,
+          <literal>nat</literal> hasn't been supported since kernel 2.6.
+        '';
+      };
+
       via = mkOption {
         type = types.nullOr types.str;
         default = null;

nixos/tests/networking.nix

@@ -77,12 +77,14 @@ let
   testCases = {
     loopback = {
       name = "Loopback";
-      machine.networking.useDHCP = false;
+      nodes.client = { pkgs, ... }: with pkgs.lib; {
-      machine.networking.useNetworkd = networkd;
+        networking.useDHCP = false;
+        networking.useNetworkd = networkd;
+      };
       testScript = ''
         start_all()
-        machine.wait_for_unit("network.target")
+        client.wait_for_unit("network.target")
-        loopback_addresses = machine.succeed("ip addr show lo")
+        loopback_addresses = client.succeed("ip addr show lo")
         assert "inet 127.0.0.1/8" in loopback_addresses
         assert "inet6 ::1/128" in loopback_addresses
       '';
@@ -139,6 +141,25 @@ let
               client.wait_until_succeeds("ping -c 1 192.168.3.1")
         '';
     };
+    routeType = {
+      name = "RouteType";
+      nodes.client = { pkgs, ... }: with pkgs.lib; {
+        networking = {
+          useDHCP = false;
+          useNetworkd = networkd;
+          interfaces.eth1.ipv4.routes = [{
+            address = "192.168.1.127";
+            prefixLength = 32;
+            type = "local";
+          }];
+        };
+      };
+      testScript = ''
+        start_all()
+        client.wait_for_unit("network.target")
+        client.succeed("ip -4 route list table local | grep 'local 192.168.1.127'")
+      '';
+    };
     dhcpDefault = {
       name = "useDHCP-by-default";
       nodes.router = router;