822918df4c
The `network-link-${i.name}` units raced with other things trying to
configure the interface, or ran before the interface was available.
Instead of running our own set of shell scripts on boot, and hoping
they're executed at the right time, we can make use of udev to configure
the interface *while they appear*, by providing `.link` files in
/etc/systemd/network/*.link to set MACAddress and MTUBytes.
This doesn't require networkd to be enabled, and is populated properly
on non-networkd systems since
https://github.com/NixOS/nixpkgs/pull/82941.
This continues clean-up work done in
https://github.com/NixOS/nixpkgs/pull/85170 for the scripted networking
stack.
The only leftover part of the `network-link-${i.name}` unit (bringing
the interface up) is moved to the beginning of the
`network-addresses-${i.name}` unit.
Fixes: https://github.com/NixOS/nixpkgs/issues/74471
Closes: https://github.com/NixOS/nixpkgs/pull/87116
553 lines
24 KiB
Nix
553 lines
24 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with utils;
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with lib;
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let
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cfg = config.networking;
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interfaces = attrValues cfg.interfaces;
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slaves = concatMap (i: i.interfaces) (attrValues cfg.bonds)
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++ concatMap (i: i.interfaces) (attrValues cfg.bridges)
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++ concatMap (i: attrNames (filterAttrs (_: config: config.type != "internal") i.interfaces)) (attrValues cfg.vswitches)
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++ concatMap (i: [i.interface]) (attrValues cfg.macvlans)
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++ concatMap (i: [i.interface]) (attrValues cfg.vlans);
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# We must escape interfaces due to the systemd interpretation
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subsystemDevice = interface:
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"sys-subsystem-net-devices-${escapeSystemdPath interface}.device";
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interfaceIps = i:
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i.ipv4.addresses
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++ optionals cfg.enableIPv6 i.ipv6.addresses;
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destroyBond = i: ''
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while true; do
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UPDATED=1
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SLAVES=$(ip link | grep 'master ${i}' | awk -F: '{print $2}')
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for I in $SLAVES; do
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UPDATED=0
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ip link set "$I" nomaster
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done
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[ "$UPDATED" -eq "1" ] && break
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done
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ip link set "${i}" down 2>/dev/null || true
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ip link del "${i}" 2>/dev/null || true
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'';
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# warn that these attributes are deprecated (2017-2-2)
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# Should be removed in the release after next
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bondDeprecation = rec {
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deprecated = [ "lacp_rate" "miimon" "mode" "xmit_hash_policy" ];
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filterDeprecated = bond: (filterAttrs (attrName: attr:
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elem attrName deprecated && attr != null) bond);
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};
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bondWarnings =
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let oneBondWarnings = bondName: bond:
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mapAttrsToList (bondText bondName) (bondDeprecation.filterDeprecated bond);
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bondText = bondName: optName: _:
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"${bondName}.${optName} is deprecated, use ${bondName}.driverOptions";
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in {
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warnings = flatten (mapAttrsToList oneBondWarnings cfg.bonds);
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};
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normalConfig = {
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systemd.network.links = let
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createNetworkLink = i: nameValuePair "40-${i.name}" {
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matchConfig.OriginalName = i.name;
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linkConfig = optionalAttrs (i.macAddress != null) {
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MACAddress = i.macAddress;
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} // optionalAttrs (i.mtu != null) {
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MTUBytes = toString i.mtu;
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};
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};
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in listToAttrs (map createNetworkLink interfaces);
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systemd.services =
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let
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deviceDependency = dev:
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# Use systemd service if we manage device creation, else
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# trust udev when not in a container
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if (hasAttr dev (filterAttrs (k: v: v.virtual) cfg.interfaces)) ||
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(hasAttr dev cfg.bridges) ||
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(hasAttr dev cfg.bonds) ||
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(hasAttr dev cfg.macvlans) ||
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(hasAttr dev cfg.sits) ||
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(hasAttr dev cfg.vlans) ||
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(hasAttr dev cfg.vswitches)
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then [ "${dev}-netdev.service" ]
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else optional (dev != null && dev != "lo" && !config.boot.isContainer) (subsystemDevice dev);
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hasDefaultGatewaySet = (cfg.defaultGateway != null && cfg.defaultGateway.address != "")
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|| (cfg.enableIPv6 && cfg.defaultGateway6 != null && cfg.defaultGateway6.address != "");
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networkLocalCommands = {
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after = [ "network-setup.service" ];
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bindsTo = [ "network-setup.service" ];
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};
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networkSetup =
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{ description = "Networking Setup";
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after = [ "network-pre.target" "systemd-udevd.service" "systemd-sysctl.service" ];
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before = [ "network.target" "shutdown.target" ];
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wants = [ "network.target" ];
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# exclude bridges from the partOf relationship to fix container networking bug #47210
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partOf = map (i: "network-addresses-${i.name}.service") (filter (i: !(hasAttr i.name cfg.bridges)) interfaces);
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conflicts = [ "shutdown.target" ];
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wantedBy = [ "multi-user.target" ] ++ optional hasDefaultGatewaySet "network-online.target";
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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path = [ pkgs.iproute ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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unitConfig.DefaultDependencies = false;
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script =
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''
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${optionalString config.networking.resolvconf.enable ''
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# Set the static DNS configuration, if given.
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${pkgs.openresolv}/sbin/resolvconf -m 1 -a static <<EOF
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${optionalString (cfg.nameservers != [] && cfg.domain != null) ''
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domain ${cfg.domain}
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''}
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${optionalString (cfg.search != []) ("search " + concatStringsSep " " cfg.search)}
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${flip concatMapStrings cfg.nameservers (ns: ''
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nameserver ${ns}
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'')}
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EOF
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''}
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# Set the default gateway.
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${optionalString (cfg.defaultGateway != null && cfg.defaultGateway.address != "") ''
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${optionalString (cfg.defaultGateway.interface != null) ''
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ip route replace ${cfg.defaultGateway.address} dev ${cfg.defaultGateway.interface} ${optionalString (cfg.defaultGateway.metric != null)
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"metric ${toString cfg.defaultGateway.metric}"
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} proto static
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''}
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ip route replace default ${optionalString (cfg.defaultGateway.metric != null)
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"metric ${toString cfg.defaultGateway.metric}"
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} via "${cfg.defaultGateway.address}" ${
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optionalString (cfg.defaultGatewayWindowSize != null)
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"window ${toString cfg.defaultGatewayWindowSize}"} ${
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optionalString (cfg.defaultGateway.interface != null)
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"dev ${cfg.defaultGateway.interface}"} proto static
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''}
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${optionalString (cfg.defaultGateway6 != null && cfg.defaultGateway6.address != "") ''
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${optionalString (cfg.defaultGateway6.interface != null) ''
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ip -6 route replace ${cfg.defaultGateway6.address} dev ${cfg.defaultGateway6.interface} ${optionalString (cfg.defaultGateway6.metric != null)
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"metric ${toString cfg.defaultGateway6.metric}"
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} proto static
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''}
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ip -6 route replace default ${optionalString (cfg.defaultGateway6.metric != null)
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"metric ${toString cfg.defaultGateway6.metric}"
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} via "${cfg.defaultGateway6.address}" ${
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optionalString (cfg.defaultGatewayWindowSize != null)
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"window ${toString cfg.defaultGatewayWindowSize}"} ${
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optionalString (cfg.defaultGateway6.interface != null)
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"dev ${cfg.defaultGateway6.interface}"} proto static
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''}
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'';
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};
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# For each interface <foo>, create a job ‘network-addresses-<foo>.service"
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# that performs static address configuration. It has a "wants"
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# dependency on ‘<foo>.service’, which is supposed to create
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# the interface and need not exist (i.e. for hardware
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# interfaces). It has a binds-to dependency on the actual
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# network device, so it only gets started after the interface
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# has appeared, and it's stopped when the interface
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# disappears.
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configureAddrs = i:
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let
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ips = interfaceIps i;
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in
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nameValuePair "network-addresses-${i.name}"
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{ description = "Address configuration of ${i.name}";
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wantedBy = [
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"network-setup.service"
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"network.target"
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];
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# order before network-setup because the routes that are configured
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# there may need ip addresses configured
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before = [ "network-setup.service" ];
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bindsTo = deviceDependency i.name;
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after = [ "network-pre.target" ] ++ (deviceDependency i.name);
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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# Restart rather than stop+start this unit to prevent the
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# network from dying during switch-to-configuration.
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stopIfChanged = false;
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path = [ pkgs.iproute ];
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script =
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''
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state="/run/nixos/network/addresses/${i.name}"
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mkdir -p $(dirname "$state")
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ip link set "${i.name}" up
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${flip concatMapStrings ips (ip:
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let
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cidr = "${ip.address}/${toString ip.prefixLength}";
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in
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''
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echo "${cidr}" >> $state
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echo -n "adding address ${cidr}... "
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if out=$(ip addr add "${cidr}" dev "${i.name}" 2>&1); then
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echo "done"
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elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
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echo "'ip addr add "${cidr}" dev "${i.name}"' failed: $out"
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exit 1
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fi
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''
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)}
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state="/run/nixos/network/routes/${i.name}"
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mkdir -p $(dirname "$state")
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${flip concatMapStrings (i.ipv4.routes ++ i.ipv6.routes) (route:
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let
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cidr = "${route.address}/${toString route.prefixLength}";
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via = optionalString (route.via != null) ''via "${route.via}"'';
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options = concatStrings (mapAttrsToList (name: val: "${name} ${val} ") route.options);
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in
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''
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echo "${cidr}" >> $state
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echo -n "adding route ${cidr}... "
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if out=$(ip route add "${cidr}" ${options} ${via} dev "${i.name}" proto static 2>&1); then
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echo "done"
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elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
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echo "'ip route add "${cidr}" ${options} ${via} dev "${i.name}"' failed: $out"
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exit 1
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fi
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''
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)}
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'';
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preStop = ''
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state="/run/nixos/network/routes/${i.name}"
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while read cidr; do
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echo -n "deleting route $cidr... "
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ip route del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
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done < "$state"
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rm -f "$state"
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state="/run/nixos/network/addresses/${i.name}"
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while read cidr; do
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echo -n "deleting address $cidr... "
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ip addr del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
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done < "$state"
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rm -f "$state"
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'';
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};
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createTunDevice = i: nameValuePair "${i.name}-netdev"
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{ description = "Virtual Network Interface ${i.name}";
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bindsTo = [ "dev-net-tun.device" ];
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after = [ "dev-net-tun.device" "network-pre.target" ];
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wantedBy = [ "network-setup.service" (subsystemDevice i.name) ];
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partOf = [ "network-setup.service" ];
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before = [ "network-setup.service" ];
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path = [ pkgs.iproute ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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ip tuntap add dev "${i.name}" mode "${i.virtualType}" user "${i.virtualOwner}"
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'';
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postStop = ''
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ip link del ${i.name} || true
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'';
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};
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createBridgeDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = concatLists (map deviceDependency v.interfaces);
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in
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{ description = "Bridge Interface ${n}";
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wantedBy = [ "network-setup.service" (subsystemDevice n) ];
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bindsTo = deps ++ optional v.rstp "mstpd.service";
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partOf = [ "network-setup.service" ] ++ optional v.rstp "mstpd.service";
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after = [ "network-pre.target" ] ++ deps ++ optional v.rstp "mstpd.service"
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++ map (i: "network-addresses-${i}.service") v.interfaces;
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before = [ "network-setup.service" ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute ];
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script = ''
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# Remove Dead Interfaces
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echo "Removing old bridge ${n}..."
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ip link show "${n}" >/dev/null 2>&1 && ip link del "${n}"
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echo "Adding bridge ${n}..."
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ip link add name "${n}" type bridge
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# Enslave child interfaces
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${flip concatMapStrings v.interfaces (i: ''
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ip link set "${i}" master "${n}"
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ip link set "${i}" up
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'')}
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# Save list of enslaved interfaces
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echo "${flip concatMapStrings v.interfaces (i: ''
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${i}
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'')}" > /run/${n}.interfaces
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${optionalString config.virtualisation.libvirtd.enable ''
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# Enslave dynamically added interfaces which may be lost on nixos-rebuild
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#
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# if `libvirtd.service` is not running, do not use `virsh` which would try activate it via 'libvirtd.socket' and thus start it out-of-order.
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# `libvirtd.service` will set up bridge interfaces when it will start normally.
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#
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if /run/current-system/systemd/bin/systemctl --quiet is-active 'libvirtd.service'; then
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for uri in qemu:///system lxc:///; do
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for dom in $(${pkgs.libvirt}/bin/virsh -c $uri list --name); do
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${pkgs.libvirt}/bin/virsh -c $uri dumpxml "$dom" | \
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${pkgs.xmlstarlet}/bin/xmlstarlet sel -t -m "//domain/devices/interface[@type='bridge'][source/@bridge='${n}'][target/@dev]" -v "concat('ip link set ',target/@dev,' master ',source/@bridge,';')" | \
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${pkgs.bash}/bin/bash
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done
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done
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fi
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''}
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# Enable stp on the interface
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${optionalString v.rstp ''
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echo 2 >/sys/class/net/${n}/bridge/stp_state
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''}
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ip link set "${n}" up
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'';
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postStop = ''
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ip link set "${n}" down || true
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ip link del "${n}" || true
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rm -f /run/${n}.interfaces
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'';
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reload = ''
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# Un-enslave child interfaces (old list of interfaces)
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for interface in `cat /run/${n}.interfaces`; do
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ip link set "$interface" nomaster up
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done
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# Enslave child interfaces (new list of interfaces)
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${flip concatMapStrings v.interfaces (i: ''
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ip link set "${i}" master "${n}"
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ip link set "${i}" up
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'')}
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# Save list of enslaved interfaces
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echo "${flip concatMapStrings v.interfaces (i: ''
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${i}
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'')}" > /run/${n}.interfaces
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# (Un-)set stp on the bridge
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echo ${if v.rstp then "2" else "0"} > /sys/class/net/${n}/bridge/stp_state
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'';
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reloadIfChanged = true;
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});
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createVswitchDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = concatLists (map deviceDependency (attrNames (filterAttrs (_: config: config.type != "internal") v.interfaces)));
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internalConfigs = map (i: "network-addresses-${i}.service") (attrNames (filterAttrs (_: config: config.type == "internal") v.interfaces));
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ofRules = pkgs.writeText "vswitch-${n}-openFlowRules" v.openFlowRules;
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in
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{ description = "Open vSwitch Interface ${n}";
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wantedBy = [ "network-setup.service" (subsystemDevice n) ] ++ internalConfigs;
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# before = [ "network-setup.service" ];
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# should work without internalConfigs dependencies because address/link configuration depends
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# on the device, which is created by ovs-vswitchd with type=internal, but it does not...
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before = [ "network-setup.service" ] ++ internalConfigs;
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partOf = [ "network-setup.service" ]; # shutdown the bridge when network is shutdown
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bindsTo = [ "ovs-vswitchd.service" ]; # requires ovs-vswitchd to be alive at all times
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after = [ "network-pre.target" "ovs-vswitchd.service" ] ++ deps; # start switch after physical interfaces and vswitch daemon
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wants = deps; # if one or more interface fails, the switch should continue to run
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute config.virtualisation.vswitch.package ];
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preStart = ''
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echo "Resetting Open vSwitch ${n}..."
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ovs-vsctl --if-exists del-br ${n} -- add-br ${n} \
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-- set bridge ${n} protocols=${concatStringsSep "," v.supportedOpenFlowVersions}
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'';
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script = ''
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echo "Configuring Open vSwitch ${n}..."
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ovs-vsctl ${concatStrings (mapAttrsToList (name: config: " -- add-port ${n} ${name}" + optionalString (config.vlan != null) " tag=${toString config.vlan}") v.interfaces)} \
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${concatStrings (mapAttrsToList (name: config: optionalString (config.type != null) " -- set interface ${name} type=${config.type}") v.interfaces)} \
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${concatMapStrings (x: " -- set-controller ${n} " + x) v.controllers} \
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${concatMapStrings (x: " -- " + x) (splitString "\n" v.extraOvsctlCmds)}
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||
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||
|
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echo "Adding OpenFlow rules for Open vSwitch ${n}..."
|
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ovs-ofctl --protocols=${v.openFlowVersion} add-flows ${n} ${ofRules}
|
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'';
|
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postStop = ''
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echo "Cleaning Open vSwitch ${n}"
|
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echo "Shuting down internal ${n} interface"
|
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ip link set ${n} down || true
|
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echo "Deleting flows for ${n}"
|
||
ovs-ofctl --protocols=${v.openFlowVersion} del-flows ${n} || true
|
||
echo "Deleting Open vSwitch ${n}"
|
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ovs-vsctl --if-exists del-br ${n} || true
|
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'';
|
||
});
|
||
|
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createBondDevice = n: v: nameValuePair "${n}-netdev"
|
||
(let
|
||
deps = concatLists (map deviceDependency v.interfaces);
|
||
in
|
||
{ description = "Bond Interface ${n}";
|
||
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
|
||
bindsTo = deps;
|
||
partOf = [ "network-setup.service" ];
|
||
after = [ "network-pre.target" ] ++ deps
|
||
++ map (i: "network-addresses-${i}.service") v.interfaces;
|
||
before = [ "network-setup.service" ];
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serviceConfig.Type = "oneshot";
|
||
serviceConfig.RemainAfterExit = true;
|
||
path = [ pkgs.iproute pkgs.gawk ];
|
||
script = ''
|
||
echo "Destroying old bond ${n}..."
|
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${destroyBond n}
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||
|
||
echo "Creating new bond ${n}..."
|
||
ip link add name "${n}" type bond \
|
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${let opts = (mapAttrs (const toString)
|
||
(bondDeprecation.filterDeprecated v))
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||
// v.driverOptions;
|
||
in concatStringsSep "\n"
|
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(mapAttrsToList (set: val: " ${set} ${val} \\") opts)}
|
||
|
||
# !!! There must be a better way to wait for the interface
|
||
while [ ! -d "/sys/class/net/${n}" ]; do sleep 0.1; done;
|
||
|
||
# Bring up the bond and enslave the specified interfaces
|
||
ip link set "${n}" up
|
||
${flip concatMapStrings v.interfaces (i: ''
|
||
ip link set "${i}" down
|
||
ip link set "${i}" master "${n}"
|
||
'')}
|
||
'';
|
||
postStop = destroyBond n;
|
||
});
|
||
|
||
createMacvlanDevice = n: v: nameValuePair "${n}-netdev"
|
||
(let
|
||
deps = deviceDependency v.interface;
|
||
in
|
||
{ description = "Vlan Interface ${n}";
|
||
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
|
||
bindsTo = deps;
|
||
partOf = [ "network-setup.service" ];
|
||
after = [ "network-pre.target" ] ++ deps;
|
||
before = [ "network-setup.service" ];
|
||
serviceConfig.Type = "oneshot";
|
||
serviceConfig.RemainAfterExit = true;
|
||
path = [ pkgs.iproute ];
|
||
script = ''
|
||
# Remove Dead Interfaces
|
||
ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
|
||
ip link add link "${v.interface}" name "${n}" type macvlan \
|
||
${optionalString (v.mode != null) "mode ${v.mode}"}
|
||
ip link set "${n}" up
|
||
'';
|
||
postStop = ''
|
||
ip link delete "${n}" || true
|
||
'';
|
||
});
|
||
|
||
createSitDevice = n: v: nameValuePair "${n}-netdev"
|
||
(let
|
||
deps = deviceDependency v.dev;
|
||
in
|
||
{ description = "6-to-4 Tunnel Interface ${n}";
|
||
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
|
||
bindsTo = deps;
|
||
partOf = [ "network-setup.service" ];
|
||
after = [ "network-pre.target" ] ++ deps;
|
||
before = [ "network-setup.service" ];
|
||
serviceConfig.Type = "oneshot";
|
||
serviceConfig.RemainAfterExit = true;
|
||
path = [ pkgs.iproute ];
|
||
script = ''
|
||
# Remove Dead Interfaces
|
||
ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
|
||
ip link add name "${n}" type sit \
|
||
${optionalString (v.remote != null) "remote \"${v.remote}\""} \
|
||
${optionalString (v.local != null) "local \"${v.local}\""} \
|
||
${optionalString (v.ttl != null) "ttl ${toString v.ttl}"} \
|
||
${optionalString (v.dev != null) "dev \"${v.dev}\""}
|
||
ip link set "${n}" up
|
||
'';
|
||
postStop = ''
|
||
ip link delete "${n}" || true
|
||
'';
|
||
});
|
||
|
||
createVlanDevice = n: v: nameValuePair "${n}-netdev"
|
||
(let
|
||
deps = deviceDependency v.interface;
|
||
in
|
||
{ description = "Vlan Interface ${n}";
|
||
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
|
||
bindsTo = deps;
|
||
partOf = [ "network-setup.service" ];
|
||
after = [ "network-pre.target" ] ++ deps;
|
||
before = [ "network-setup.service" ];
|
||
serviceConfig.Type = "oneshot";
|
||
serviceConfig.RemainAfterExit = true;
|
||
path = [ pkgs.iproute ];
|
||
script = ''
|
||
# Remove Dead Interfaces
|
||
ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
|
||
ip link add link "${v.interface}" name "${n}" type vlan id "${toString v.id}"
|
||
|
||
# We try to bring up the logical VLAN interface. If the master
|
||
# interface the logical interface is dependent upon is not up yet we will
|
||
# fail to immediately bring up the logical interface. The resulting logical
|
||
# interface will brought up later when the master interface is up.
|
||
ip link set "${n}" up || true
|
||
'';
|
||
postStop = ''
|
||
ip link delete "${n}" || true
|
||
'';
|
||
});
|
||
|
||
in listToAttrs (
|
||
map configureAddrs interfaces ++
|
||
map createTunDevice (filter (i: i.virtual) interfaces))
|
||
// mapAttrs' createBridgeDevice cfg.bridges
|
||
// mapAttrs' createVswitchDevice cfg.vswitches
|
||
// mapAttrs' createBondDevice cfg.bonds
|
||
// mapAttrs' createMacvlanDevice cfg.macvlans
|
||
// mapAttrs' createSitDevice cfg.sits
|
||
// mapAttrs' createVlanDevice cfg.vlans
|
||
// {
|
||
network-setup = networkSetup;
|
||
network-local-commands = networkLocalCommands;
|
||
};
|
||
|
||
services.udev.extraRules =
|
||
''
|
||
KERNEL=="tun", TAG+="systemd"
|
||
'';
|
||
|
||
|
||
};
|
||
|
||
in
|
||
|
||
{
|
||
config = mkMerge [
|
||
bondWarnings
|
||
(mkIf (!cfg.useNetworkd) normalConfig)
|
||
{ # Ensure slave interfaces are brought up
|
||
networking.interfaces = genAttrs slaves (i: {});
|
||
}
|
||
];
|
||
}
|