feat: add support for untagged frames

Should cover egress & ingress.

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

lib/eval-config.nix

@@ -12,6 +12,7 @@ in
     "${modulesPath}/hardware.nix"
     "${modulesPath}/base.nix"
     "${modulesPath}/busybox.nix"
+    "${modulesPath}/iproute2.nix"
     "${modulesPath}/hostname.nix"
     "${modulesPath}/kernel"
     "${modulesPath}/s6"

modules/all-modules.nix

@@ -7,6 +7,7 @@
     ./base.nix
    ./bridge
    ./busybox.nix
+   ./iproute2.nix
    ./dhcp6c
    ./jitter-rng
    ./dnsmasq

modules/base.nix

@@ -130,7 +130,7 @@ in {
     nixpkgs.buildPlatform = lib.mkDefault builtins.currentSystem;
 
     defaultProfile.packages = with pkgs;
-      [ s6 s6-init-bin execline s6-linux-init s6-rc ];
+      [ s6 s6-init-bin execline s6-linux-init s6-rc iproute2 ];
     # Set the useful PS1 prompt by default.
     defaultProfile.environmentVariables.PS1 = lib.mkDefault config.defaultProfile.prompt;
 

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 +34,20 @@ 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";
+        };
+        default-pvid = mkOption {
+          type = types.int;
+          default = 0;
+          description = "Default PVID for ingress untagged frames, defaults to 0, which disable untagged frames for ingress";
+        };
+      };
     };
     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 ${toString untagged.default-pvid}" else "";
 in oneshot rec {
   name = "${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/busybox.nix

@@ -37,7 +37,7 @@ let
     "comm" "cp" "cpio" "cut" "date" "dhcprelay" "dd" "df" "dirname" "dmesg"
     "du" "echo" "egrep" "env" "expand" "expr" "false" "fdisk" "fgrep" "find"
     "free" "fuser" "grep" "gunzip" "gzip" "head" "hexdump" "hostname" "hwclock"
-    "ifconfig" "ip" "ipaddr" "iplink" "ipneigh" "iproute" "iprule" "kill"
+    "ifconfig" "ipneigh" "kill"
     "killall" "killall5" "less" "ln" "ls" "lsattr" "lsof" "md5sum" "mkdir"
     "mknod" "mktemp" "mount" "mv" "nc" "netstat" "nohup" "od" "pgrep" "pidof"
     "ping" "ping6" "pkill" "pmap" "printenv" "printf" "ps" "pwd" "readlink"

modules/iproute2.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, lib, ... }:
+let
+  inherit (lib) mkEnableOption mkPackageOption mkIf genAttrs;
+  inherit (pkgs.pseudofile) dir symlink;
+  cfg = config.programs.iproute2;
+  minimalPrograms = [
+    "ip"
+    "devlink"
+    "ss"
+    "bridge"
+    "genl"
+    "ifstat"
+    "nstat"
+  ];
+  links = genAttrs minimalPrograms (p: symlink "${cfg.package}/bin/${p}");
+in
+{
+  options.programs.iproute2 = {
+    enable = mkEnableOption "the iproute2 programs instead of busybox variants";
+    package = mkPackageOption pkgs "iproute2" { };
+  };
+
+  config = mkIf cfg.enable {
+    filesystem = dir {
+      bin = dir links;
+    };
+  };
+}

modules/outputs/initramfs.nix

@@ -54,7 +54,7 @@ in
             mount -t sysfs none /sys
             ${busybox}/bin/sh
           '';
-          refs = pkgs.writeReferencesToFile busybox;
+          refs = pkgs.writeClosure [ busybox ];
         in runCommand "initramfs.cpio" {} ''
           cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > out
           dir /proc 0755 0 0

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

overlay.nix

@@ -142,6 +142,8 @@ extraPkgs // {
            rev = "hostap-liminix-integration";
            hash = "sha256-5Xi90keCHxvuKR5Q7STuZDzuM9h9ac6aWoXVQYvqkQI=";
          };
+        # Do not take any patch.
+        patches = [];
         extraConfig = "";
         configurePhase = ''
           cat > hostapd/defconfig <<EOF
@@ -184,6 +186,7 @@ extraPkgs // {
            rev = "hostap-liminix-integration";
            hash = "sha256-5Xi90keCHxvuKR5Q7STuZDzuM9h9ac6aWoXVQYvqkQI=";
       };
+      patches = [];
       extraConfig = "";
       configurePhase = ''
         cat > hostapd/defconfig <<EOF
@@ -194,6 +197,30 @@ extraPkgs // {
     });
   in h.override { openssl = null; sqlite = null; };
 
+  libnl = prev.libnl.override {
+    graphviz = null;
+  };
+
+  iproute2 =
+  let i = prev.iproute2.overrideAttrs (old: {
+    postInstall = ''
+      ${(old.postInstall or "")}
+      non_necessary_binaries=("tc" "rdma" "dcb" "tipc" "vdpa")
+      for needless_binary in "''${non_necessary_binaries[@]}"; do
+        echo "Removing unnecessary binary $out/sbin/$needless_binary"
+        rm "$out/sbin/$needless_binary"
+      done
+      # No man
+      rm -rf "$out/share"
+      # Remove all the data about distributions for tc.
+      rm -rf "$out/lib"
+    '';
+  });
+  # Don't bring ebpf stuff to the table.
+  # We also remove tc so we can drop iptables as well.
+  # Let's try to kill `db` as well.
+  in i.override { elfutils = null; iptables = null; db = null; };
+
   wpa_supplicant = prev.wpa_supplicant.override {
     dbusSupport = false;
     withPcsclite = false;

pkgs/initramfs-peek/default.nix

@@ -3,7 +3,7 @@
 , pkgsBuildBuild
 , runCommand
 , cpio
-, writeReferencesToFile
+, writeClosure
 , writeScript
 } :
 let
@@ -18,7 +18,7 @@ let
     mount -t sysfs none /sys
     ${busybox}/bin/sh
   '';
-  refs = writeReferencesToFile busybox;
+  refs = writeClosure [ busybox ];
 in runCommand "initramfs.cpio" { } ''
   cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > out
   dir /proc 0755 0 0

pkgs/levitate/default.nix

@@ -2,6 +2,7 @@
   writeScriptBin
 , writeScript
 , systemconfig
+, stdenv
 , execline
 , lib
 , config ? {}
@@ -56,11 +57,19 @@ let
       };
       eval = lib.evalModules {
         modules = [
-          { _module.args = { inherit pkgs; inherit (pkgs) lim; }; }
           ../../modules/base.nix
           ../../modules/users.nix
           ../../modules/busybox.nix
+          ../../modules/hostname.nix
+          ../../modules/misc/assertions.nix
+          ../../modules/nixpkgs.nix
           base
+          {
+            # Inherit from that target system host platform.
+            nixpkgs.hostPlatform = stdenv.hostPlatform;
+            # Force our own package set.
+            nixpkgs.pkgs = lib.mkForce pkgs;
+          }
           ({ ... } : paramConfig)
           ../../modules/s6
         ];