148 lines
4.4 KiB
Nix
148 lines
4.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.boot.initrd.network;
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dhcpInterfaces = lib.attrNames (lib.filterAttrs (iface: v: v.useDHCP == true) (config.networking.interfaces or {}));
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doDhcp = config.networking.useDHCP || dhcpInterfaces != [];
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dhcpIfShellExpr = if config.networking.useDHCP
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then "$(ls /sys/class/net/ | grep -v ^lo$)"
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else lib.concatMapStringsSep " " lib.escapeShellArg dhcpInterfaces;
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udhcpcScript = pkgs.writeScript "udhcp-script"
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''
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#! /bin/sh
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if [ "$1" = bound ]; then
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ip address add "$ip/$mask" dev "$interface"
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if [ -n "$mtu" ]; then
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ip link set mtu "$mtu" dev "$interface"
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fi
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if [ -n "$staticroutes" ]; then
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echo "$staticroutes" \
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| sed -r "s@(\S+) (\S+)@ ip route add \"\1\" via \"\2\" dev \"$interface\" ; @g" \
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| sed -r "s@ via \"0\.0\.0\.0\"@@g" \
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| /bin/sh
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fi
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if [ -n "$router" ]; then
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ip route add "$router" dev "$interface" # just in case if "$router" is not within "$ip/$mask" (e.g. Hetzner Cloud)
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ip route add default via "$router" dev "$interface"
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fi
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if [ -n "$dns" ]; then
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rm -f /etc/resolv.conf
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for i in $dns; do
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echo "nameserver $dns" >> /etc/resolv.conf
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done
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fi
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fi
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'';
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udhcpcArgs = toString cfg.udhcpc.extraArgs;
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in
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{
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options = {
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boot.initrd.network.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Add network connectivity support to initrd. The network may be
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configured using the <literal>ip</literal> kernel parameter,
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as described in <link
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xlink:href="https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt">the
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kernel documentation</link>. Otherwise, if
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<option>networking.useDHCP</option> is enabled, an IP address
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is acquired using DHCP.
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You should add the module(s) required for your network card to
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boot.initrd.availableKernelModules.
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<literal>lspci -v | grep -iA8 'network\|ethernet'</literal>
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will tell you which.
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'';
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};
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boot.initrd.network.flushBeforeStage2 = 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 clear the configuration of the interfaces that were set up in
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the initrd right before stage 2 takes over. Stage 2 will do the regular network
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configuration based on the NixOS networking options.
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'';
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};
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boot.initrd.network.udhcpc.extraArgs = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Additional command-line arguments passed verbatim to udhcpc if
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<option>boot.initrd.network.enable</option> and <option>networking.useDHCP</option>
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are enabled.
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'';
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};
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boot.initrd.network.postCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed after stage 1 of the
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boot has initialised the network.
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'';
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};
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};
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config = mkIf cfg.enable {
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boot.initrd.kernelModules = [ "af_packet" ];
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boot.initrd.extraUtilsCommands = ''
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copy_bin_and_libs ${pkgs.klibc}/lib/klibc/bin.static/ipconfig
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'';
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boot.initrd.preLVMCommands = mkBefore (
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# Search for interface definitions in command line.
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''
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ifaces=""
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for o in $(cat /proc/cmdline); do
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case $o in
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ip=*)
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ipconfig $o && ifaces="$ifaces $(echo $o | cut -d: -f6)"
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;;
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esac
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done
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''
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# Otherwise, use DHCP.
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+ optionalString doDhcp ''
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# Bring up all interfaces.
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for iface in ${dhcpIfShellExpr}; do
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echo "bringing up network interface $iface..."
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ip link set "$iface" up && ifaces="$ifaces $iface"
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done
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# Acquire DHCP leases.
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for iface in ${dhcpIfShellExpr}; do
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echo "acquiring IP address via DHCP on $iface..."
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udhcpc --quit --now -i $iface -O staticroutes --script ${udhcpcScript} ${udhcpcArgs}
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done
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''
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+ cfg.postCommands);
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boot.initrd.postMountCommands = mkIf cfg.flushBeforeStage2 ''
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for iface in $ifaces; do
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ip address flush "$iface"
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ip link set "$iface" down
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done
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'';
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};
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}
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