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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 {
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.
'';
};
services.radvd.config = mkOption {
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.extraUsers.radvd =
{ uid = config.ids.uids.radvd;
description = "Router Advertisement Daemon User";
};
systemd.services.radvd =
{ description = "IPv6 Router Advertisement Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
path = [ pkgs.radvd ];
preStart = ''
mkdir -m 755 -p /run/radvd
chown radvd /run/radvd
'';
serviceConfig =
{ ExecStart = "@${pkgs.radvd}/sbin/radvd radvd"
+ " -p /run/radvd/radvd.pid -m syslog -u radvd -C ${confFile}";
Restart = "always";
Type = "forking";
PIDFile = "/run/radvd/radvd.pid";
};
};
};
}
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