shinobu/router: Disable wg-upstream
This only complicates many things and creates too much overhead on such a slow connection.
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8D3C82F9F309F8EC
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@ -1,13 +1,3 @@
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{
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domain = "home.sbruder.de";
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vpnBypassFwMark = 10000;
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wg-upstream = {
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endpoint = rec {
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address = "193.32.248.71";
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port = 51820;
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full = "${address}:${toString port}";
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};
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publicKey = "eprzkkkSbXCANngQDo305DIAvkKAnZaN71IpTNaOoTk=";
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addresses = [ "10.66.208.88/32" "fc00:bbbb:bbbb:bb01::3:d057/128" ];
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};
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}
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@ -12,8 +12,8 @@
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# It consists of shinobu as a router (this configuration),
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# connected to a TP-LINK TL-SG105E “smart managed” (i.e., it can do VLANs) 5-port switch.
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# The upstream comes (for now) from a PŸUR “WLAN-Kabelbox” (Compal CH7467CE).
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# Sadly, I could not enable bridge mode on it, so the packets now go through (at least) four layers of NAT:
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# device → NAT on shinobu (→ NAT on plastic router → PŸUR CGNAT) → NAT on VPN
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# Sadly, I could not enable bridge mode on it, so the packets now go through (at least) three layers of NAT:
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# device → NAT on shinobu → NAT on plastic router → PŸUR CGNAT
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#
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# Because the switch only supports GbE,
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# the two clients I currently have with support for 2.5GbE are connected
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@ -45,11 +45,6 @@ in
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ethtool
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];
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sops.secrets.wg-upstream-private-key = {
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owner = config.users.users.systemd-network.name;
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sopsFile = ../../secrets.yaml;
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};
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networking.useDHCP = false;
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systemd.network = {
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@ -63,24 +58,6 @@ in
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Kind = "bridge";
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};
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};
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wg-upstream = {
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netdevConfig = {
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Kind = "wireguard";
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Name = "wg-upstream";
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};
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wireguardConfig = {
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PrivateKeyFile = config.sops.secrets.wg-upstream-private-key.path;
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FirewallMark = 51820;
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};
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wireguardPeers = lib.singleton {
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wireguardPeerConfig = with cfg.wg-upstream; {
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Endpoint = endpoint.full;
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PublicKey = publicKey;
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AllowedIPs = [ "0.0.0.0/0" "::0/0" ];
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PersistentKeepalive = 25;
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};
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};
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};
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};
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networks = {
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wan = {
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@ -115,66 +92,6 @@ in
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domains = [ cfg.domain ];
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address = [ "10.80.1.1/24" "fd00:80:1::1/64" ];
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};
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wg-upstream = {
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name = "wg-upstream";
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address = cfg.wg-upstream.addresses;
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routingPolicyRules = [
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{
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routingPolicyRuleConfig = {
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Family = "both"; # default is only ipv4
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FirewallMark = cfg.vpnBypassFwMark;
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InvertRule = "yes";
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Table = 51820;
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Priority = 10;
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#SuppressPrefixLength = 0; # can’t be used here (forwarding does not work with it)
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};
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}
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# FIXME: those two shouldn’t be necessary
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# It should automatically detect those routes existing and prioritise them
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# LAN (v4)
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{
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routingPolicyRuleConfig = {
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To = "10.80.1.0/24";
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Priority = 9;
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};
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}
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# LAN (v6)
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{
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routingPolicyRuleConfig = {
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To = "fd00:80:1::/64";
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Priority = 9;
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};
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}
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# wg-home
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{
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routingPolicyRuleConfig = {
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To = "10.80.0.0/24";
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Priority = 9;
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};
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}
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# plastic router
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{
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routingPolicyRuleConfig = {
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To = "192.168.0.0/24";
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Priority = 9;
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};
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}
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];
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routes = [
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{
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routeConfig = {
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Gateway = "0.0.0.0"; # point-to-point connection
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Table = 51820;
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};
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}
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{
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routeConfig = {
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Gateway = "::";
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Table = 51820;
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};
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}
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];
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};
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};
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};
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services.resolved.enable = false;
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@ -10,11 +10,7 @@ let
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else lib.generators.mkValueStringDefault { } v;
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} " = ";
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passthru = {
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WG_UPSTREAM_ENDPOINT_ADDRESS = cfg.wg-upstream.endpoint.address;
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WG_UPSTREAM_ENDPOINT_PORT = cfg.wg-upstream.endpoint.port;
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VPN_BYPASS_MARK = cfg.vpnBypassFwMark;
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};
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passthru = { };
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defines = lib.concatStringsSep
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"\n"
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@ -1,76 +1,21 @@
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define NAT_LAN_IFACES = { "br-lan" }
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define NAT_WAN_IFACES = { "wg-upstream" }
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define PHYSICAL_WAN = "enp1s0"
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define MASQUERADE_IFACES = { $NAT_WAN_IFACES, $PHYSICAL_WAN }
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define PLASTIC_ROUTER_V4 = 192.168.0.1
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define NAT_WAN_IFACES = { $PHYSICAL_WAN }
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table inet filter {
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chain forward {
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type filter hook forward priority filter; policy drop
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# Use MSS clamping
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# to avoid too large packets from client on the lan
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# not going through the tunnel.
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iifname wg-upstream tcp flags syn / syn,rst tcp option maxseg size set rt mtu
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oifname wg-upstream tcp flags syn / syn,rst tcp option maxseg size set rt mtu
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# allow traffic between lan and wan
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iifname $NAT_LAN_IFACES oifname $NAT_WAN_IFACES counter accept
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iifname $NAT_WAN_IFACES oifname $NAT_LAN_IFACES ct state established,related counter accept
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# accept responses on physical wan
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iifname $PHYSICAL_WAN oifname $NAT_LAN_IFACES ct state established,related counter accept
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# allow selected destinations via physical wan
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# plastic router
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iifname $NAT_LAN_IFACES oifname $PHYSICAL_WAN ip daddr $PLASTIC_ROUTER_V4 counter accept
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# all destinations configured via policy based routing
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oifname $PHYSICAL_WAN mark $VPN_BYPASS_MARK counter accept
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}
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}
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table inet nat {
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chain postrouting {
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type nat hook postrouting priority filter; policy accept
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oifname $MASQUERADE_IFACES masquerade
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}
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}
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# Bypass VPN by setting mark.
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# This acts in two places that are handled separatly by nftables:
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# Packets from the local host (output hook) and forwared packets (prerouting hook).
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# To simplify the handling,
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# there is a single chain that handles both,
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# which is jumped to from the specific chains.
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table inet vpn-bypass {
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# This must be of type route, otherwise no route lookup will be performed
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chain output {
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type route hook output priority mangle
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jump common
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}
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# This does not need to be of type route
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chain prerouting {
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type filter hook prerouting priority mangle
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jump common
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}
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chain common {
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tcp dport {
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22, # SSH
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443, # HTTPS
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465, # SMTPS
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993, # IMAPS
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2022, # SSH
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2222, # SSH
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} mark set $VPN_BYPASS_MARK counter
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udp dport {
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1637, # wg
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51820, # wg
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64738, # mumble
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} mark set $VPN_BYPASS_MARK counter
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oifname $NAT_WAN_IFACES masquerade
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}
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}
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@ -96,20 +41,8 @@ table inet restrict-wan {
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chain postrouting {
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type filter hook postrouting priority 0; policy accept
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# accept connections to plastic router
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oifname $PHYSICAL_WAN ip daddr $PLASTIC_ROUTER_V4 counter accept
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# accept icmpv6
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oifname $PHYSICAL_WAN icmpv6 type { nd-neighbor-solicit, nd-router-advert, nd-neighbor-advert } accept
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# accept connections to selected endpoints
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# VPN (wg-upstream)
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oifname $PHYSICAL_WAN ip daddr $WG_UPSTREAM_ENDPOINT_ADDRESS udp dport $WG_UPSTREAM_ENDPOINT_PORT counter accept # only this is used
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# destinations configured in VPN bypass
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oifname $PHYSICAL_WAN mark $VPN_BYPASS_MARK counter accept
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# drop all other packets
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oifname $PHYSICAL_WAN counter drop
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# accept connections over physical wan
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oifname $PHYSICAL_WAN counter accept
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}
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}
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