666 lines
19 KiB
Nix
666 lines
19 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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with utils;
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let
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cfg = config.networking;
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interfaces = attrValues cfg.interfaces;
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hasVirtuals = any (i: i.virtual) interfaces;
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hasSits = cfg.sits != { };
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hasBonds = cfg.bonds != { };
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# We must escape interfaces due to the systemd interpretation
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subsystemDevice = interface:
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"sys-subsystem-net-devices-${escapeSystemdPath interface}.device";
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addrOpts = v:
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assert v == 4 || v == 6;
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{
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address = mkOption {
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type = types.str;
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description = ''
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IPv${toString v} address of the interface. Leave empty to configure the
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interface using DHCP.
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'';
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};
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prefixLength = mkOption {
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type = types.addCheck types.int (n: n >= 0 && n <= (if v == 4 then 32 else 128));
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description = ''
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Subnet mask of the interface, specified as the number of
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bits in the prefix (<literal>${if v == 4 then "24" else "64"}</literal>).
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'';
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};
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};
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interfaceOpts = { name, ... }: {
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options = {
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name = mkOption {
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example = "eth0";
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type = types.str;
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description = "Name of the interface.";
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};
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useDHCP = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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Whether this interface should be configured with dhcp.
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Null implies the old behavior which depends on whether ip addresses
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are specified or not.
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'';
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};
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ip4 = mkOption {
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default = [ ];
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example = [
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{ address = "10.0.0.1"; prefixLength = 16; }
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{ address = "192.168.1.1"; prefixLength = 24; }
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];
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type = types.listOf types.optionSet;
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options = addrOpts 4;
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description = ''
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List of IPv4 addresses that will be statically assigned to the interface.
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'';
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};
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ip6 = mkOption {
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default = [ ];
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example = [
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{ address = "fdfd:b3f0:482::1"; prefixLength = 48; }
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{ address = "2001:1470:fffd:2098::e006"; prefixLength = 64; }
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];
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type = types.listOf types.optionSet;
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options = addrOpts 6;
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description = ''
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List of IPv6 addresses that will be statically assigned to the interface.
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'';
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};
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ipAddress = mkOption {
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default = null;
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example = "10.0.0.1";
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type = types.nullOr types.str;
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description = ''
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IP address of the interface. Leave empty to configure the
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interface using DHCP.
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'';
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};
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prefixLength = mkOption {
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default = null;
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example = 24;
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type = types.nullOr types.int;
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description = ''
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Subnet mask of the interface, specified as the number of
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bits in the prefix (<literal>24</literal>).
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'';
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};
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subnetMask = mkOption {
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default = null;
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description = ''
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Defunct, supply the prefix length instead.
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'';
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};
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ipv6Address = mkOption {
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default = null;
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example = "2001:1470:fffd:2098::e006";
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type = types.nullOr types.str;
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description = ''
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IPv6 address of the interface. Leave empty to configure the
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interface using NDP.
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'';
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};
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ipv6PrefixLength = mkOption {
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default = 64;
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example = 64;
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type = types.int;
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description = ''
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Subnet mask of the interface, specified as the number of
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bits in the prefix (<literal>64</literal>).
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'';
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};
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macAddress = mkOption {
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default = null;
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example = "00:11:22:33:44:55";
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type = types.nullOr (types.str);
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description = ''
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MAC address of the interface. Leave empty to use the default.
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'';
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};
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mtu = mkOption {
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default = null;
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example = 9000;
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type = types.nullOr types.int;
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description = ''
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MTU size for packets leaving the interface. Leave empty to use the default.
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'';
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};
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virtual = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether this interface is virtual and should be created by tunctl.
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This is mainly useful for creating bridges between a host a virtual
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network such as VPN or a virtual machine.
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'';
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};
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virtualOwner = mkOption {
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default = "root";
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type = types.str;
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description = ''
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In case of a virtual device, the user who owns it.
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'';
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};
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virtualType = mkOption {
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default = null;
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type = types.nullOr (types.addCheck types.str (v: v == "tun" || v == "tap"));
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description = ''
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The explicit type of interface to create. Accepts tun or tap strings.
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Also accepts null to implicitly detect the type of device.
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'';
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};
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proxyARP = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Turn on proxy_arp for this device (and proxy_ndp for ipv6).
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This is mainly useful for creating pseudo-bridges between a real
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interface and a virtual network such as VPN or a virtual machine for
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interfaces that don't support real bridging (most wlan interfaces).
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As ARP proxying acts slightly above the link-layer, below-ip traffic
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isn't bridged, so things like DHCP won't work. The advantage above
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using NAT lies in the fact that no IP addresses are shared, so all
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hosts are reachable/routeable.
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WARNING: turns on ip-routing, so if you have multiple interfaces, you
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should think of the consequence and setup firewall rules to limit this.
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'';
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};
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};
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config = {
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name = mkDefault name;
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};
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};
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hexChars = stringToCharacters "0123456789abcdef";
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isHexString = s: all (c: elem c hexChars) (stringToCharacters (toLower s));
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in
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{
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###### interface
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options = {
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networking.hostName = mkOption {
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default = "nixos";
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type = types.str;
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description = ''
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The name of the machine. Leave it empty if you want to obtain
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it from a DHCP server (if using DHCP).
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'';
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};
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networking.hostId = mkOption {
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default = null;
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example = "4e98920d";
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type = types.nullOr types.str;
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description = ''
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The 32-bit host ID of the machine, formatted as 8 hexadecimal characters.
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You should try to make this ID unique among your machines. You can
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generate a random 32-bit ID using the following command:
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<literal>head -c4 /dev/urandom | od -A none -t x4</literal>
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'';
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};
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networking.enableIPv6 = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to enable support for IPv6.
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'';
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};
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networking.defaultGateway = mkOption {
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default = null;
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example = "131.211.84.1";
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type = types.nullOr types.str;
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description = ''
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The default gateway. It can be left empty if it is auto-detected through DHCP.
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'';
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};
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networking.defaultGatewayWindowSize = mkOption {
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default = null;
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example = 524288;
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type = types.nullOr types.int;
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description = ''
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The window size of the default gateway. It limits maximal data bursts that TCP peers
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are allowed to send to us.
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'';
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};
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networking.nameservers = mkOption {
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default = [];
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example = ["130.161.158.4" "130.161.33.17"];
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description = ''
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The list of nameservers. It can be left empty if it is auto-detected through DHCP.
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'';
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};
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networking.search = mkOption {
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default = [];
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example = [ "example.com" "local.domain" ];
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type = types.listOf types.str;
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description = ''
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The list of search paths used when resolving domain names.
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'';
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};
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networking.domain = mkOption {
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default = null;
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example = "home";
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type = types.nullOr types.str;
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description = ''
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The domain. It can be left empty if it is auto-detected through DHCP.
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'';
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};
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networking.useHostResolvConf = mkOption {
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type = types.bool;
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default = false;
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description = ''
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In containers, whether to use the
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<filename>resolv.conf</filename> supplied by the host.
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'';
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};
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networking.localCommands = mkOption {
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default = "";
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example = "text=anything; echo You can put $text here.";
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description = ''
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Shell commands to be executed at the end of the
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<literal>network-setup</literal> systemd service. Note that if
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you are using DHCP to obtain the network configuration,
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interfaces may not be fully configured yet.
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'';
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};
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networking.interfaces = mkOption {
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default = {};
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example =
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{ eth0.ip4 = [ {
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address = "131.211.84.78";
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prefixLength = 25;
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} ];
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};
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description = ''
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The configuration for each network interface. If
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<option>networking.useDHCP</option> is true, then every
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interface not listed here will be configured using DHCP.
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'';
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type = types.loaOf types.optionSet;
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options = [ interfaceOpts ];
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};
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networking.bridges = mkOption {
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default = { };
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example =
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{ br0.interfaces = [ "eth0" "eth1" ];
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br1.interfaces = [ "eth2" "wlan0" ];
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};
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description =
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''
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This option allows you to define Ethernet bridge devices
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that connect physical networks together. The value of this
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option is an attribute set. Each attribute specifies a
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bridge, with the attribute name specifying the name of the
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bridge's network interface.
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'';
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type = types.attrsOf types.optionSet;
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options = {
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interfaces = mkOption {
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example = [ "eth0" "eth1" ];
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type = types.listOf types.string;
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description =
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"The physical network interfaces connected by the bridge.";
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};
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};
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};
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networking.bonds = mkOption {
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default = { };
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example = {
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bond0 = {
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interfaces = [ "eth0" "wlan0" ];
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miimon = 100;
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mode = "active-backup";
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};
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fatpipe.interfaces = [ "enp4s0f0" "enp4s0f1" "enp5s0f0" "enp5s0f1" ];
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};
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description = ''
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This option allows you to define bond devices that aggregate multiple,
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underlying networking interfaces together. The value of this option is
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an attribute set. Each attribute specifies a bond, with the attribute
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name specifying the name of the bond's network interface
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'';
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type = types.attrsOf types.optionSet;
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options = {
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interfaces = mkOption {
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example = [ "enp4s0f0" "enp4s0f1" "wlan0" ];
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type = types.listOf types.str;
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description = "The interfaces to bond together";
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};
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lacp_rate = mkOption {
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default = null;
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example = "fast";
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type = types.nullOr types.str;
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description = ''
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Option specifying the rate in which we'll ask our link partner
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to transmit LACPDU packets in 802.3ad mode.
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'';
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};
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miimon = mkOption {
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default = null;
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example = 100;
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type = types.nullOr types.int;
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description = ''
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Miimon is the number of millisecond in between each round of polling
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by the device driver for failed links. By default polling is not
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enabled and the driver is trusted to properly detect and handle
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failure scenarios.
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'';
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};
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mode = mkOption {
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default = null;
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example = "active-backup";
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type = types.nullOr types.str;
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description = ''
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The mode which the bond will be running. The default mode for
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the bonding driver is balance-rr, optimizing for throughput.
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More information about valid modes can be found at
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https://www.kernel.org/doc/Documentation/networking/bonding.txt
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'';
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};
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xmit_hash_policy = mkOption {
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default = null;
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example = "layer2+3";
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type = types.nullOr types.str;
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description = ''
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Selects the transmit hash policy to use for slave selection in
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balance-xor, 802.3ad, and tlb modes.
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'';
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};
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};
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};
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networking.sits = mkOption {
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type = types.attrsOf types.optionSet;
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default = { };
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example = {
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hurricane = {
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remote = "10.0.0.1";
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local = "10.0.0.22";
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ttl = 255;
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};
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msipv6 = {
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remote = "192.168.0.1";
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dev = "enp3s0";
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ttl = 127;
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};
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};
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description = ''
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This option allows you to define 6-to-4 interfaces which should be automatically created.
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'';
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options = {
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remote = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.0.0.1";
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description = ''
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The address of the remote endpoint to forward traffic over.
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'';
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};
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local = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.0.0.22";
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description = ''
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The address of the local endpoint which the remote
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side should send packets to.
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'';
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};
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ttl = mkOption {
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type = types.nullOr types.int;
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default = null;
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example = 255;
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description = ''
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The time-to-live of the connection to the remote tunnel endpoint.
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'';
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};
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dev = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "enp4s0f0";
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description = ''
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The underlying network device on which the tunnel resides.
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'';
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};
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};
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};
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networking.vlans = mkOption {
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default = { };
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example = {
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vlan0 = {
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id = 3;
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interface = "enp3s0";
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};
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vlan1 = {
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id = 1;
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interface = "wlan0";
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};
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};
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description =
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''
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This option allows you to define vlan devices that tag packets
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on top of a physical interface. The value of this option is an
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attribute set. Each attribute specifies a vlan, with the name
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specifying the name of the vlan interface.
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'';
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type = types.attrsOf types.optionSet;
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options = {
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id = mkOption {
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example = 1;
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type = types.int;
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description = "The vlan identifier";
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};
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interface = mkOption {
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example = "enp4s0";
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type = types.string;
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description = "The interface the vlan will transmit packets through.";
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};
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};
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};
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networking.useDHCP = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to use DHCP to obtain an IP address and other
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configuration for all network interfaces that are not manually
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configured.
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'';
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};
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networking.useNetworkd = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether we should use networkd as the network configuration backend or
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the legacy script based system.
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'';
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};
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};
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###### implementation
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config = {
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assertions =
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(flip map interfaces (i: {
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assertion = i.subnetMask == null;
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message = "The networking.interfaces.${i.name}.subnetMask option is defunct. Use prefixLength instead.";
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})) ++ [
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{
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assertion = cfg.hostId == null || (stringLength cfg.hostId == 8 && isHexString cfg.hostId);
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message = "Invalid value given to the networking.hostId option.";
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}
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];
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boot.kernelModules = [ ]
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++ optional cfg.enableIPv6 "ipv6"
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++ optional hasVirtuals "tun"
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++ optional hasSits "sit"
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++ optional hasBonds "bonding";
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boot.extraModprobeConfig =
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# This setting is intentional as it prevents default bond devices
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# from being created.
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optionalString hasBonds "options bonding max_bonds=0";
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boot.kernel.sysctl = {
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"net.net.ipv4.conf.all.promote_secondaries" = true;
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"net.ipv6.conf.all.disable_ipv6" = mkDefault (!cfg.enableIPv6);
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"net.ipv6.conf.default.disable_ipv6" = mkDefault (!cfg.enableIPv6);
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"net.ipv4.conf.all_forwarding" = mkDefault (any (i: i.proxyARP) interfaces);
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"net.ipv6.conf.all.forwarding" = mkDefault (any (i: i.proxyARP) interfaces);
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} // listToAttrs (concatLists (flip map (filter (i: i.proxyARP) interfaces)
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(i: flip map [ "4" "6" ] (v: nameValuePair "net.ipv${v}.conf.${i.name}.proxy_arp" true))
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));
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security.setuidPrograms = [ "ping" "ping6" ];
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|
|
# Set the host and domain names in the activation script. Don't
|
|
# clear it if it's not configured in the NixOS configuration,
|
|
# since it may have been set by dhcpcd in the meantime.
|
|
system.activationScripts.hostname =
|
|
optionalString (cfg.hostName != "") ''
|
|
hostname "${cfg.hostName}"
|
|
'';
|
|
system.activationScripts.domain =
|
|
optionalString (cfg.domain != null) ''
|
|
domainname "${cfg.domain}"
|
|
'';
|
|
|
|
environment.etc = mkIf (cfg.hostId != null)
|
|
[
|
|
{
|
|
target = "hostid";
|
|
source = pkgs.runCommand "gen-hostid" {} ''
|
|
hi="${cfg.hostId}"
|
|
${if pkgs.stdenv.isBigEndian then ''
|
|
echo -ne "\x''${hi:0:2}\x''${hi:2:2}\x''${hi:4:2}\x''${hi:6:2}" > $out
|
|
'' else ''
|
|
echo -ne "\x''${hi:6:2}\x''${hi:4:2}\x''${hi:2:2}\x''${hi:0:2}" > $out
|
|
''}
|
|
'';
|
|
}
|
|
];
|
|
|
|
environment.systemPackages =
|
|
[ pkgs.host
|
|
pkgs.iproute
|
|
pkgs.iputils
|
|
pkgs.nettools
|
|
pkgs.wirelesstools
|
|
pkgs.iw
|
|
pkgs.rfkill
|
|
pkgs.openresolv
|
|
]
|
|
|
|
systemd.services = {
|
|
network-local-commands = {
|
|
description = "Extra networking commands.";
|
|
before = [ "network.target" "network-online.target" ];
|
|
wantedBy = [ "network.target" "network-online.target" ];
|
|
unitConfig.ConditionCapability = "CAP_NET_ADMIN";
|
|
path = [ pkgs.iproute ];
|
|
serviceConfig.Type = "oneshot";
|
|
serviceConfig.RemainAfterExit = true;
|
|
script = ''
|
|
# Run any user-specified commands.
|
|
${cfg.localCommands}
|
|
'';
|
|
};
|
|
} // (listToAttrs (flip map interfaces (i:
|
|
nameValuePair "network-link-${i.name}"
|
|
{ description = "Link configuration of ${i.name}";
|
|
wantedBy = [ "network-interfaces.target" ];
|
|
before = [ "network-interfaces.target" ];
|
|
bindsTo = [ (subsystemDevice i.name) ];
|
|
after = [ (subsystemDevice i.name) ];
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
};
|
|
script =
|
|
''
|
|
echo "Configuring link..."
|
|
'' + optionalString (i.macAddress != null) ''
|
|
echo "setting MAC address to ${i.macAddress}..."
|
|
ip link set "${i.name}" address "${i.macAddress}"
|
|
'' + optionalString (i.mtu != null) ''
|
|
echo "setting MTU to ${toString i.mtu}..."
|
|
ip link set "${i.name}" mtu "${toString i.mtu}"
|
|
'';
|
|
})));
|
|
};
|
|
|
|
}
|