nixpkgs/modules/tasks/network-interfaces.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (pkgs) nettools;
cfg = config.networking;
ifconfig = "${nettools}/sbin/ifconfig";
in
{
###### interface
options = {
networking.hostName = mkOption {
default = "nixos";
description = ''
The name of the machine. Leave it empty if you want to obtain
it from a DHCP server (if using DHCP).
'';
};
networking.enableIPv6 = mkOption {
default = true;
description = ''
Whether to enable support for IPv6.
'';
};
networking.defaultGateway = mkOption {
default = "";
example = "131.211.84.1";
description = ''
The default gateway. It can be left empty if it is auto-detected through DHCP.
'';
};
networking.nameservers = mkOption {
default = [];
example = ["130.161.158.4" "130.161.33.17"];
description = ''
The list of nameservers. It can be left empty if it is auto-detected through DHCP.
'';
};
networking.domain = mkOption {
default = "";
example = "home";
description = ''
The domain. It can be left empty if it is auto-detected through DHCP.
'';
};
networking.localCommands = mkOption {
default = "";
example = "text=anything; echo You can put $text here.";
description = ''
Shell commands to be executed at the end of the
<literal>network-interfaces</literal> Upstart job. Note that if
you are using DHCP to obtain the network configuration,
interfaces may not be fully configured yet.
'';
};
networking.interfaces = mkOption {
default = [];
example = [
{ name = "eth0";
ipAddress = "131.211.84.78";
subnetMask = "255.255.255.128";
}
];
description = ''
The configuration for each network interface. If
<option>networking.useDHCP</option> is true, then every
interface not listed here will be configured using DHCP.
'';
type = types.list types.optionSet;
options = {
name = mkOption {
example = "eth0";
type = types.string;
description = ''
Name of the interface.
'';
};
ipAddress = mkOption {
default = "";
example = "10.0.0.1";
type = types.string;
description = ''
IP address of the interface. Leave empty to configure the
interface using DHCP.
'';
};
subnetMask = mkOption {
default = "";
example = "255.255.255.0";
type = types.string;
description = ''
Subnet mask of the interface. Leave empty to use the
default subnet mask.
'';
};
macAddress = mkOption {
default = "";
example = "00:11:22:33:44:55";
type = types.string;
description = ''
MAC address of the interface. Leave empty to use the default.
'';
};
};
};
networking.ifaces = mkOption {
default = listToAttrs
(map (iface: { name = iface.name; value = iface; }) config.networking.interfaces);
internal = true;
description = ''
The network interfaces in <option>networking.interfaces</option>
as an attribute set keyed on the interface name.
'';
};
};
###### implementation
config = {
boot.kernelModules = optional cfg.enableIPv6 "ipv6";
environment.systemPackages =
[ pkgs.host
pkgs.iproute
pkgs.iputils
pkgs.nettools
pkgs.wirelesstools
pkgs.rfkill
];
security.setuidPrograms = [ "ping" "ping6" ];
jobs.networkInterfaces =
{ name = "network-interfaces";
startOn = "stopped udevtrigger";
preStart =
''
export PATH=${config.system.sbin.modprobe}/sbin:${pkgs.iproute}/sbin:$PATH
modprobe af_packet || true
${pkgs.lib.concatMapStrings (i:
if i.macAddress != "" then
''
echo "Configuring interface ${i.name}..."
${ifconfig} "${i.name}" down || true
${ifconfig} "${i.name}" hw ether "${i.macAddress}" || true
''
else "") cfg.interfaces
}
for i in $(cd /sys/class/net && ls -d *); do
echo "Bringing up network device $i..."
${ifconfig} $i up || true
done
# Configure the manually specified interfaces.
${pkgs.lib.concatMapStrings (i:
if i.ipAddress != "" then
''
echo "Configuring interface ${i.name}..."
extraFlags=
if test -n "${i.subnetMask}"; then
extraFlags="$extraFlags netmask ${i.subnetMask}"
fi
${ifconfig} "${i.name}" "${i.ipAddress}" $extraFlags || true
''
else "") cfg.interfaces}
# Set the nameservers.
if test -n "${toString cfg.nameservers}"; then
rm -f /etc/resolv.conf
if test -n "${cfg.domain}"; then
echo "domain ${cfg.domain}" >> /etc/resolv.conf
fi
for i in ${toString cfg.nameservers}; do
echo "nameserver $i" >> /etc/resolv.conf
done
fi
# Set the default gateway.
if test -n "${cfg.defaultGateway}"; then
${nettools}/sbin/route add default gw "${cfg.defaultGateway}" || true
fi
# Run any user-specified commands.
${pkgs.stdenv.shell} ${pkgs.writeText "local-net-cmds" cfg.localCommands} || true
${optionalString (cfg.interfaces != [] || cfg.localCommands != "") ''
# Emit the ip-up event (e.g. to start ntpd).
initctl emit -n ip-up
''}
'';
postStop =
''
#for i in $(cd /sys/class/net && ls -d *); do
# echo "Taking down network device $i..."
# ${ifconfig} $i down || true
#done
'';
};
# Set the host name in the activation script. Don't clear it if
# it's not configured in the NixOS configuration, since it may
# have been set by dhclient in the meantime.
system.activationScripts.hostname =
optionalString (config.networking.hostName != "") ''
hostname "${config.networking.hostName}"
'';
};
}