145 lines
3.7 KiB
Nix
145 lines
3.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.dhcpcd-prefixdelegation;
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downstreamInterfaceConfig = name: opts: "${name}${
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optionalString (opts.sla_id != null) "/${builtins.toString opts.sla_id}${
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optionalString (opts.prefix_len != null) "/${builtins.toString opts.prefix_len}${
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optionalString (opts.suffix != null) "/${opts.suffix}"
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}"
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}"
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}";
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interfaceConfig = name: opts: ''
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interface ${name}
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ipv6rs
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ia_pd ${builtins.toString opts.iaid}${
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optionalString (opts.prefix != null) "/${opts.prefix}${
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optionalString (opts.prefix_len != null) "/${builtins.toString opts.prefix_len}"
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}"
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} ${concatMapStringsSep " " ({name, value}: downstreamInterfaceConfig name value) (attrsToList opts.interfaces)}
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'';
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dhcpcdConf = pkgs.writeText "dhcpcd.conf" ''
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duid
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noipv6rs
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waitip 6
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ipv6only
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allowinterfaces ${concatStringsSep " " (builtins.attrNames cfg.interfaces)} ${concatMapStringsSep " " ({name, value}: concatStringsSep "" (builtins.attrNames value.interfaces)) (attrsToList cfg.interfaces)}
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${concatMapStringsSep "\n" ({name, value}: interfaceConfig name value) (attrsToList cfg.interfaces)}
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'';
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downstreamInterfaceOpts = { ... }: {
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options = {
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sla_id = mkOption {
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type = with types; nullOr ints.unsigned;
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default = null;
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};
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prefix_len = mkOption {
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type = with types; nullOr ints.unsigned;
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default = null;
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};
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suffix = mkOption {
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type = with types; nullOr str;
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default = null;
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};
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};
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};
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interfaceOpts = { ... }: {
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options = {
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iaid = mkOption {
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type = with types; ints.unsigned;
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description = ''
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Request a delegated prefix with this IAID on this interface
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'';
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};
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prefix = mkOption {
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type = with types; nullOr str;
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default = null;
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};
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prefix_len = mkOption {
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type = with types; nullOr ints.unsigned;
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default = null;
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};
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interfaces = mkOption {
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type = with types; attrsOf (submodule downstreamInterfaceOpts);
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default = {};
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description =''
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Interfaces to assign IPv6 prefixes to
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'';
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};
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};
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};
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in
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{
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options = {
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networking.dhcpcd-prefixdelegation = {
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enable = mkEnableOption "dhcpcd for prefixdelegation";
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interfaces = mkOption {
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type = with types; attrsOf (submodule interfaceOpts);
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default = {};
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description = ''
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Interfaces to request IPv6 prefixes from
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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environment.etc."dhcpcd.conf".source = dhcpcdConf;
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systemd.services.dhcpcd-prefixdelegation = {
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description = "DHCP Client for IPv6 Prefix Delegation";
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wantedBy = [ "multi-user.target" ];
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wants = [ "network.target" ];
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before = [ "network-online.target" ];
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# Stopping dhcpcd during a reconfiguration is undesirable
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# because it brings down the network interfaces configured by
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# dhcpcd. So do a "systemctl restart" instead.
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stopIfChanged = false;
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path = [ pkgs.dhcpcd ];
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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serviceConfig =
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{ Type = "forking";
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PIDFile = "/run/dhcpcd/pid";
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RuntimeDirectory = "dhcpcd";
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ExecStart = "@${pkgs.dhcpcd}/sbin/dhcpcd dhcpcd --quiet --config ${dhcpcdConf}";
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ExecReload = "${pkgs.dhcpcd}/sbin/dhcpcd --rebind";
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Restart = "always";
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};
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};
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users.users.dhcpcd = {
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isSystemUser = true;
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group = "dhcpcd";
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};
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users.groups.dhcpcd = {};
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};
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}
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