feat: add support for untagged frames

Should cover egress & ingress.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

modules/bridge/default.nix

@@ -9,8 +9,7 @@
 
 { lib, pkgs, config, ...}:
 let
-  inherit (lib) mkOption types;
-  inherit (pkgs.liminix.services) oneshot;
+  inherit (lib) mkOption types mkEnableOption;
   inherit (pkgs) liminix;
 in
 {
@@ -35,6 +34,15 @@ in
         default = null;
         description = "reuse mac address from an existing interface service";
       };
+
+      untagged = {
+        enable = mkEnableOption "untagged frames on port VID";
+        pvid = mkOption {
+          type = types.nullOr types.int;
+          default = null;
+          description = "Port VLAN ID for egress untagged frames";
+        };
+      };
     };
     members = config.system.callService ./members.nix {
       primary = mkOption {

modules/bridge/primary.nix

@@ -3,17 +3,22 @@
 , ifwait
 , lib
 }:
-{ ifname, macAddressFromInterface ? null } :
+{ ifname, macAddressFromInterface ? null, untagged } :
 let
-  inherit (liminix.services) bundle oneshot;
-  inherit (lib) mkOption types optional;
+  inherit (liminix.services) oneshot;
+  inherit (lib) optional optionalString;
+  # This enables vlan_filtering if we do make use of it.
+  extra = if untagged.enable then " vlan_filtering 1 vlan_default_pvid 0" else "";
 in oneshot rec {
   name = "${ifname}.link";
   up = ''
     ${if macAddressFromInterface == null then
-      "ip link add name ${ifname} type bridge"
+      "ip link add name ${ifname} type bridge${extra}"
       else
-      "ip link add name ${ifname} address $(output ${macAddressFromInterface} ether) type bridge"}
+      "ip link add name ${ifname} address $(output ${macAddressFromInterface} ether) type bridge${extra}"}
+
+      ${optionalString untagged.enable 
+        "bridge vlan add vid ${toString untagged.pvid} dev ${ifname} pvid untagged self"}
 
       (in_outputs ${name}
         echo ${ifname} > ifname

modules/vlan/default.nix

@@ -33,6 +33,11 @@ in
       description = "VLAN identifier (VID) in range 1-4094";
       type = types.str;
     };
+    untagged.egress = mkOption {
+      description = "Whether packets from this interface will go out *untagged*";
+      type = types.bool;
+      default = false;
+    };
   };
   config.kernel.config = {
     VLAN_8021Q = "y";

modules/vlan/service.nix

@@ -2,13 +2,15 @@
   liminix
 , lib
 }:
-{ ifname, primary, vid } :
+{ ifname, primary, vid, untagged } :
 let
+  inherit (lib) optionalString;
   inherit (liminix.services) oneshot;
 in oneshot rec {
   name = "${ifname}.link";
   up = ''
     ip link add link $(output ${primary} ifname) name ${ifname} type vlan id ${vid}
+    ${optionalString untagged.egress "bridge vlan add dev ${ifname} vid ${toString untagged.vid} pvid untagged master"}
     ${liminix.networking.ifup name ifname}
     (in_outputs ${name}
      echo ${ifname} > ifname