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-rw-r--r--tv/3modules/dnsmasq.nix57
1 files changed, 57 insertions, 0 deletions
diff --git a/tv/3modules/dnsmasq.nix b/tv/3modules/dnsmasq.nix
new file mode 100644
index 000000000..ec927f98a
--- /dev/null
+++ b/tv/3modules/dnsmasq.nix
@@ -0,0 +1,57 @@
+with import <stockholm/lib>;
+{ config, ... }: let
+ cfg = config.tv.dnsmasq;
+in {
+
+ options.tv.dnsmasq = {
+ enable = mkEnableOption "tv.dnsmasq";
+ dhcp-range = mkOption {
+ type = types.str;
+ };
+ interface = mkOption {
+ type = types.str;
+ };
+ address = mkOption {
+ type = types.str;
+ };
+ prefixLength = mkOption {
+ type = types.addCheck types.int (x: x >= 0 && x <= 32);
+ };
+ };
+
+ config = mkIf cfg.enable (mkMerge [
+ {
+ networking.dhcpcd.denyInterfaces = [ cfg.interface ];
+ services.dnsmasq.resolveLocalQueries = false;
+ networking.interfaces.${cfg.interface} = {
+ ipv4.addresses = singleton {
+ address = cfg.address;
+ prefixLength = cfg.prefixLength;
+ };
+ };
+ services.dnsmasq.enable = true;
+ services.dnsmasq.extraConfig = ''
+ dhcp-range=${cfg.dhcp-range}
+ interface=${cfg.interface}
+ '';
+ tv.iptables.extra.filter.INPUT = [
+ "-i ${cfg.interface} -p tcp -m tcp --dport bootps -j ACCEPT"
+ "-i ${cfg.interface} -p udp -m udp --dport bootps -j ACCEPT"
+ "-i ${cfg.interface} -p tcp -m tcp --dport domain -j ACCEPT"
+ "-i ${cfg.interface} -p udp -m udp --dport domain -j ACCEPT"
+ ];
+ }
+ {
+ # enable forwarding
+ boot.kernel.sysctl."net.ipv4.ip_forward" = true;
+ tv.iptables.extra.filter.FORWARD = [
+ "-m state --state RELATED,ESTABLISHED -j ACCEPT"
+ "-i ${cfg.interface} -j ACCEPT"
+ ];
+ tv.iptables.extra.nat.POSTROUTING = [
+ "-j MASQUERADE"
+ ];
+ }
+ ]);
+
+}