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nixfiles/modules/dhcpcd-prefixdelegation/default.nix

145 lines
3.7 KiB
Nix

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