84 lines
2.5 KiB
Nix
84 lines
2.5 KiB
Nix
# Portions of this file are sourced from
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# https://github.com/NickCao/flakes/blob/3b03efb676ea602575c916b2b8bc9d9cd13b0d85/modules/gravity/default.nix
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{
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config,
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lib,
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pkgs,
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mylib,
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...
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}:
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with lib;
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let
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inherit (mylib.network) cidr;
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cfg = config.services.enthalpy;
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in
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{
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options.services.enthalpy.srv6 = {
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enable = mkEnableOption "segment routing over IPv6";
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prefix = mkOption {
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type = types.str;
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default = cidr.subnet 4 6 cfg.prefix;
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description = ''
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Prefix used for SRv6 actions.
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'';
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};
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actions = mkOption {
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type = types.listOf types.str;
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default = [
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"${cidr.host 1 cfg.srv6.prefix} encap seg6local action End.DT6 table main dev enthalpy table localsid"
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"${cidr.host 2 cfg.srv6.prefix} encap seg6local action End.DT6 table nat64 dev enthalpy table localsid"
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];
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description = ''
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List of SRv6 actions configured in the default network namespace.
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'';
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};
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};
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config = mkIf (cfg.enable && cfg.srv6.enable) {
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systemd.network.config = {
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networkConfig = {
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IPv6Forwarding = true;
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ManageForeignRoutes = false;
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};
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};
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systemd.network.networks."50-enthalpy" = {
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routes = singleton {
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Destination = "::/0";
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Type = "blackhole";
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Table = config.networking.routingTables.localsid;
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};
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routingPolicyRules = singleton {
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Priority = config.networking.routingPolicyPriorities.localsid;
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Family = "ipv6";
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Table = config.networking.routingTables.localsid;
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From = cfg.network;
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To = cfg.srv6.prefix;
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};
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};
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systemd.services.enthalpy-srv6 = {
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path = with pkgs; [ iproute2 ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStartPre = [
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"${pkgs.iproute2}/bin/ip -n ${cfg.netns} -6 r a ${cfg.srv6.prefix} from ${cfg.network} via fe80::ff:fe00:1 dev enthalpy"
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];
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ExecStart = builtins.map (route: "${pkgs.iproute2}/bin/ip -6 r a ${route}") cfg.srv6.actions;
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ExecStop = builtins.map (route: "${pkgs.iproute2}/bin/ip -6 r d ${route}") cfg.srv6.actions;
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ExecStopPost = [
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"${pkgs.iproute2}/bin/ip -n ${cfg.netns} -6 r d ${cfg.srv6.prefix} from ${cfg.network} via fe80::ff:fe00:1 dev enthalpy"
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];
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};
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after = [
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"netns-enthalpy.service"
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"network-online.target"
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];
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requires = [ "netns-enthalpy.service" ];
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wants = [ "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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};
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};
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}
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