1 files changed, 115 insertions, 0 deletions
diff --git a/os/kay/modules/hurricane.nix b/os/kay/modules/hurricane.nix
new file mode 100644
index 0000000..9e22bf5
--- /dev/null
+++ b/os/kay/modules/hurricane.nix
@@ -0,0 +1,115 @@
+{ config, pkgs, lib, ... }:
+
+let
+  iface = "hurricane";
+  remote = "216.218.221.42";
+
+  clinet = "2001:470:35:72a::2";
+  server = "2001:470:35:72a::1";
+
+  prefix64 = "2001:470:36:72a::/64";
+  prefix48 = "2001:470:ee65::/48";
+
+  makeAddr = prefix: host: let
+    split = lib.strings.splitString "/" prefix;
+  in {
+    address = "${lib.head split}${host}";
+    prefixLength = lib.toInt (lib.last split);
+  };
+in
+{
+  networking = {
+    sits.${iface} = {
+      inherit remote;
+      ttl = 225;
+    };
+    interfaces.${iface} = {
+      mtu = 1440; # 1460(ppp0) - 20
+      ipv6.addresses = [
+        {
+          address = clinet;
+          prefixLength = 64;
+        }
+
+        (makeAddr prefix64 "1")
+        (makeAddr prefix48 "1")
+        (makeAddr prefix48 "1337")
+      ];
+    };
+
+    iproute2 = {
+      enable = true;
+      rttablesExtraConfig = "200 hurricane";
+    };
+
+    firewall.extraCommands =
+      "iptables -A INPUT --proto 41 --source ${remote} --jump ACCEPT";
+  };
+
+  sops.secrets = {
+    "hurricane/username" = {};
+    "hurricane/update_key" = {};
+    "hurricane/tunnel_id" = {};
+  };
+
+  systemd.services."network-route-${iface}" = {
+    description = "Routing configuration of ${iface}";
+    wantedBy = [
+      "network-setup.service"
+      "network.target"
+    ];
+    before = [ "network-setup.service" ];
+    bindsTo = [ "network-addresses-hurricane.service" ];
+    after = [ "network-pre.target" "network-addresses-hurricane.service" ];
+    # restart rather than stop+start this unit to prevent the
+    # network from dying during switch-to-configuration.
+    stopIfChanged = false;
+
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+
+    path = [ pkgs.iproute2 ];
+    script = ''
+      echo -n "adding route"
+
+      ip -6 rule add from ${clinet}/64 table hurricane || exit 1
+      ip -6 rule add from ${prefix64} table hurricane || exit 1
+      ip -6 rule add from ${prefix48} table hurricane || exit 1
+
+      ip -6 route add default via ${server} dev hurricane table hurricane || exit 1
+    '';
+    preStop = ''
+      echo -n "deleting route"
+
+      ip -6 route del default via ${server} dev hurricane table hurricane || exit 1
+
+      ip -6 rule del from ${prefix48} table hurricane || exit 1
+      ip -6 rule del from ${prefix64} table hurricane || exit 1
+      ip -6 rule del from ${clinet}/64 table hurricane || exit 1
+    '';
+  };
+
+
+  services.pppd.script."01-${iface}" = {
+    runtimeInputs = with pkgs; [ curl coreutils iproute2 iputils ];
+    text = ''
+      wan_ip="$4"
+      username="$(cat ${config.sops.secrets."hurricane/username".path})"
+      update_key="$(cat ${config.sops.secrets."hurricane/update_key".path})"
+      tunnel_id="$(cat ${config.sops.secrets."hurricane/tunnel_id".path})"
+
+      auth_url="https://$username:$update_key@ipv4.tunnelbroker.net/nic/update?hostname=$tunnel_id"
+      until curl --silent "$auth_url"; do
+          sleep 1
+      done
+
+      while [ ! -e /sys/class/net/${iface} ]; do
+          sleep 1 # make sure ${iface} is up
+      done
+
+      ip tunnel change ${iface} local "$wan_ip" mode sit
+    '';
+  };
+}