depot/third_party/nixpkgs/nixos/modules/services/networking/radvd.nix

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# Module for the IPv6 Router Advertisement Daemon.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.radvd;
confFile = pkgs.writeText "radvd.conf" cfg.config;
in
{
###### interface
options.services.radvd = {
enable = mkOption {
type = types.bool;
default = false;
description =
''
Whether to enable the Router Advertisement Daemon
(<command>radvd</command>), which provides link-local
advertisements of IPv6 router addresses and prefixes using
the Neighbor Discovery Protocol (NDP). This enables
stateless address autoconfiguration in IPv6 clients on the
network.
'';
};
package = mkOption {
type = types.package;
default = pkgs.radvd;
defaultText = literalExpression "pkgs.radvd";
description = ''
The RADVD package to use for the RADVD service.
'';
};
config = mkOption {
type = types.lines;
example =
''
interface eth0 {
AdvSendAdvert on;
prefix 2001:db8:1234:5678::/64 { };
};
'';
description =
''
The contents of the radvd configuration file.
'';
};
};
###### implementation
config = mkIf cfg.enable {
users.users.radvd =
{
isSystemUser = true;
group = "radvd";
description = "Router Advertisement Daemon User";
};
users.groups.radvd = {};
systemd.services.radvd =
{ description = "IPv6 Router Advertisement Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig =
{ ExecStart = "@${cfg.package}/bin/radvd radvd -n -u radvd -C ${confFile}";
Restart = "always";
};
};
};
}