nixpkgs/nixos/modules/tasks/network-interfaces-scripted.nix
Florian Klink 532528190b nixos/networking: move network-link-${i.name} to scripted networking
The unit sets MTU and MAC Address even with networkd enabled, which
isn't necessary anymore, as networkd handles this by itself.
2020-04-13 22:03:35 +02:00

576 lines
25 KiB
Nix
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

{ config, lib, pkgs, utils, ... }:
with utils;
with lib;
let
cfg = config.networking;
interfaces = attrValues cfg.interfaces;
slaves = concatMap (i: i.interfaces) (attrValues cfg.bonds)
++ concatMap (i: i.interfaces) (attrValues cfg.bridges)
++ concatMap (i: attrNames (filterAttrs (_: config: config.type != "internal") i.interfaces)) (attrValues cfg.vswitches)
++ concatMap (i: [i.interface]) (attrValues cfg.macvlans)
++ concatMap (i: [i.interface]) (attrValues cfg.vlans);
# We must escape interfaces due to the systemd interpretation
subsystemDevice = interface:
"sys-subsystem-net-devices-${escapeSystemdPath interface}.device";
interfaceIps = i:
i.ipv4.addresses
++ optionals cfg.enableIPv6 i.ipv6.addresses;
destroyBond = i: ''
while true; do
UPDATED=1
SLAVES=$(ip link | grep 'master ${i}' | awk -F: '{print $2}')
for I in $SLAVES; do
UPDATED=0
ip link set "$I" nomaster
done
[ "$UPDATED" -eq "1" ] && break
done
ip link set "${i}" down 2>/dev/null || true
ip link del "${i}" 2>/dev/null || true
'';
# warn that these attributes are deprecated (2017-2-2)
# Should be removed in the release after next
bondDeprecation = rec {
deprecated = [ "lacp_rate" "miimon" "mode" "xmit_hash_policy" ];
filterDeprecated = bond: (filterAttrs (attrName: attr:
elem attrName deprecated && attr != null) bond);
};
bondWarnings =
let oneBondWarnings = bondName: bond:
mapAttrsToList (bondText bondName) (bondDeprecation.filterDeprecated bond);
bondText = bondName: optName: _:
"${bondName}.${optName} is deprecated, use ${bondName}.driverOptions";
in {
warnings = flatten (mapAttrsToList oneBondWarnings cfg.bonds);
};
normalConfig = {
systemd.services =
let
deviceDependency = dev:
# Use systemd service if we manage device creation, else
# trust udev when not in a container
if (hasAttr dev (filterAttrs (k: v: v.virtual) cfg.interfaces)) ||
(hasAttr dev cfg.bridges) ||
(hasAttr dev cfg.bonds) ||
(hasAttr dev cfg.macvlans) ||
(hasAttr dev cfg.sits) ||
(hasAttr dev cfg.vlans) ||
(hasAttr dev cfg.vswitches)
then [ "${dev}-netdev.service" ]
else optional (dev != null && dev != "lo" && !config.boot.isContainer) (subsystemDevice dev);
hasDefaultGatewaySet = (cfg.defaultGateway != null && cfg.defaultGateway.address != "")
|| (cfg.enableIPv6 && cfg.defaultGateway6 != null && cfg.defaultGateway6.address != "");
networkLocalCommands = {
after = [ "network-setup.service" ];
bindsTo = [ "network-setup.service" ];
};
networkSetup =
{ description = "Networking Setup";
after = [ "network-pre.target" "systemd-udevd.service" "systemd-sysctl.service" ];
before = [ "network.target" "shutdown.target" ];
wants = [ "network.target" ];
# exclude bridges from the partOf relationship to fix container networking bug #47210
partOf = map (i: "network-addresses-${i.name}.service") (filter (i: !(hasAttr i.name cfg.bridges)) interfaces);
conflicts = [ "shutdown.target" ];
wantedBy = [ "multi-user.target" ] ++ optional hasDefaultGatewaySet "network-online.target";
unitConfig.ConditionCapability = "CAP_NET_ADMIN";
path = [ pkgs.iproute ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
unitConfig.DefaultDependencies = false;
script =
''
${optionalString config.networking.resolvconf.enable ''
# Set the static DNS configuration, if given.
${pkgs.openresolv}/sbin/resolvconf -m 1 -a static <<EOF
${optionalString (cfg.nameservers != [] && cfg.domain != null) ''
domain ${cfg.domain}
''}
${optionalString (cfg.search != []) ("search " + concatStringsSep " " cfg.search)}
${flip concatMapStrings cfg.nameservers (ns: ''
nameserver ${ns}
'')}
EOF
''}
# Set the default gateway.
${optionalString (cfg.defaultGateway != null && cfg.defaultGateway.address != "") ''
${optionalString (cfg.defaultGateway.interface != null) ''
ip route replace ${cfg.defaultGateway.address} dev ${cfg.defaultGateway.interface} ${optionalString (cfg.defaultGateway.metric != null)
"metric ${toString cfg.defaultGateway.metric}"
} proto static
''}
ip route replace default ${optionalString (cfg.defaultGateway.metric != null)
"metric ${toString cfg.defaultGateway.metric}"
} via "${cfg.defaultGateway.address}" ${
optionalString (cfg.defaultGatewayWindowSize != null)
"window ${toString cfg.defaultGatewayWindowSize}"} ${
optionalString (cfg.defaultGateway.interface != null)
"dev ${cfg.defaultGateway.interface}"} proto static
''}
${optionalString (cfg.defaultGateway6 != null && cfg.defaultGateway6.address != "") ''
${optionalString (cfg.defaultGateway6.interface != null) ''
ip -6 route replace ${cfg.defaultGateway6.address} dev ${cfg.defaultGateway6.interface} ${optionalString (cfg.defaultGateway6.metric != null)
"metric ${toString cfg.defaultGateway6.metric}"
} proto static
''}
ip -6 route replace default ${optionalString (cfg.defaultGateway6.metric != null)
"metric ${toString cfg.defaultGateway6.metric}"
} via "${cfg.defaultGateway6.address}" ${
optionalString (cfg.defaultGatewayWindowSize != null)
"window ${toString cfg.defaultGatewayWindowSize}"} ${
optionalString (cfg.defaultGateway6.interface != null)
"dev ${cfg.defaultGateway6.interface}"} proto static
''}
'';
};
# For each interface <foo>, create a job network-addresses-<foo>.service"
# that performs static address configuration. It has a "wants"
# dependency on <foo>.service, which is supposed to create
# the interface and need not exist (i.e. for hardware
# interfaces). It has a binds-to dependency on the actual
# network device, so it only gets started after the interface
# has appeared, and it's stopped when the interface
# disappears.
configureAddrs = i:
let
ips = interfaceIps i;
in
nameValuePair "network-addresses-${i.name}"
{ description = "Address configuration of ${i.name}";
wantedBy = [
"network-setup.service"
"network-link-${i.name}.service"
"network.target"
];
# order before network-setup because the routes that are configured
# there may need ip addresses configured
before = [ "network-setup.service" ];
bindsTo = deviceDependency i.name;
after = [ "network-pre.target" ] ++ (deviceDependency i.name);
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
# Restart rather than stop+start this unit to prevent the
# network from dying during switch-to-configuration.
stopIfChanged = false;
path = [ pkgs.iproute ];
script =
''
state="/run/nixos/network/addresses/${i.name}"
mkdir -p $(dirname "$state")
${flip concatMapStrings ips (ip:
let
cidr = "${ip.address}/${toString ip.prefixLength}";
in
''
echo "${cidr}" >> $state
echo -n "adding address ${cidr}... "
if out=$(ip addr add "${cidr}" dev "${i.name}" 2>&1); then
echo "done"
elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
echo "'ip addr add "${cidr}" dev "${i.name}"' failed: $out"
exit 1
fi
''
)}
state="/run/nixos/network/routes/${i.name}"
mkdir -p $(dirname "$state")
${flip concatMapStrings (i.ipv4.routes ++ i.ipv6.routes) (route:
let
cidr = "${route.address}/${toString route.prefixLength}";
via = optionalString (route.via != null) ''via "${route.via}"'';
options = concatStrings (mapAttrsToList (name: val: "${name} ${val} ") route.options);
in
''
echo "${cidr}" >> $state
echo -n "adding route ${cidr}... "
if out=$(ip route add "${cidr}" ${options} ${via} dev "${i.name}" proto static 2>&1); then
echo "done"
elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
echo "'ip route add "${cidr}" ${options} ${via} dev "${i.name}"' failed: $out"
exit 1
fi
''
)}
'';
preStop = ''
state="/run/nixos/network/routes/${i.name}"
while read cidr; do
echo -n "deleting route $cidr... "
ip route del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
done < "$state"
rm -f "$state"
state="/run/nixos/network/addresses/${i.name}"
while read cidr; do
echo -n "deleting address $cidr... "
ip addr del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
done < "$state"
rm -f "$state"
'';
};
createNetworkLink = i:
let
deviceDependency = if (config.boot.isContainer || i.name == "lo")
then []
else [ (subsystemDevice i.name) ];
in
nameValuePair "network-link-${i.name}"
{ description = "Link configuration of ${i.name}";
wantedBy = [ "network-interfaces.target" ];
before = [ "network-interfaces.target" ];
bindsTo = deviceDependency;
after = [ "network-pre.target" ] ++ deviceDependency;
path = [ pkgs.iproute ];
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 "${toString i.mtu}"
'' + ''
echo -n "bringing up interface... "
ip link set "${i.name}" up && echo "done" || (echo "failed"; exit 1)
'';
};
createTunDevice = i: nameValuePair "${i.name}-netdev"
{ description = "Virtual Network Interface ${i.name}";
bindsTo = [ "dev-net-tun.device" ];
after = [ "dev-net-tun.device" "network-pre.target" ];
wantedBy = [ "network-setup.service" (subsystemDevice i.name) ];
partOf = [ "network-setup.service" ];
before = [ "network-setup.service" ];
path = [ pkgs.iproute ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
script = ''
ip tuntap add dev "${i.name}" mode "${i.virtualType}" user "${i.virtualOwner}"
'';
postStop = ''
ip link del ${i.name} || true
'';
};
createBridgeDevice = n: v: nameValuePair "${n}-netdev"
(let
deps = concatLists (map deviceDependency v.interfaces);
in
{ description = "Bridge Interface ${n}";
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
bindsTo = deps ++ optional v.rstp "mstpd.service";
partOf = [ "network-setup.service" ] ++ optional v.rstp "mstpd.service";
after = [ "network-pre.target" ] ++ deps ++ optional v.rstp "mstpd.service"
++ concatMap (i: [ "network-addresses-${i}.service" "network-link-${i}.service" ]) v.interfaces;
before = [ "network-setup.service" ];
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
path = [ pkgs.iproute ];
script = ''
# Remove Dead Interfaces
echo "Removing old bridge ${n}..."
ip link show "${n}" >/dev/null 2>&1 && ip link del "${n}"
echo "Adding bridge ${n}..."
ip link add name "${n}" type bridge
# Enslave child interfaces
${flip concatMapStrings v.interfaces (i: ''
ip link set "${i}" master "${n}"
ip link set "${i}" up
'')}
# Save list of enslaved interfaces
echo "${flip concatMapStrings v.interfaces (i: ''
${i}
'')}" > /run/${n}.interfaces
${optionalString config.virtualisation.libvirtd.enable ''
# Enslave dynamically added interfaces which may be lost on nixos-rebuild
#
# 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.
# `libvirtd.service` will set up bridge interfaces when it will start normally.
#
if ${pkgs.systemd}/bin/systemctl --quiet is-active 'libvirtd.service'; then
for uri in qemu:///system lxc:///; do
for dom in $(${pkgs.libvirt}/bin/virsh -c $uri list --name); do
${pkgs.libvirt}/bin/virsh -c $uri dumpxml "$dom" | \
${pkgs.xmlstarlet}/bin/xmlstarlet sel -t -m "//domain/devices/interface[@type='bridge'][source/@bridge='${n}'][target/@dev]" -v "concat('ip link set ',target/@dev,' master ',source/@bridge,';')" | \
${pkgs.bash}/bin/bash
done
done
fi
''}
# Enable stp on the interface
${optionalString v.rstp ''
echo 2 >/sys/class/net/${n}/bridge/stp_state
''}
ip link set "${n}" up
'';
postStop = ''
ip link set "${n}" down || true
ip link del "${n}" || true
rm -f /run/${n}.interfaces
'';
reload = ''
# Un-enslave child interfaces (old list of interfaces)
for interface in `cat /run/${n}.interfaces`; do
ip link set "$interface" nomaster up
done
# Enslave child interfaces (new list of interfaces)
${flip concatMapStrings v.interfaces (i: ''
ip link set "${i}" master "${n}"
ip link set "${i}" up
'')}
# Save list of enslaved interfaces
echo "${flip concatMapStrings v.interfaces (i: ''
${i}
'')}" > /run/${n}.interfaces
# (Un-)set stp on the bridge
echo ${if v.rstp then "2" else "0"} > /sys/class/net/${n}/bridge/stp_state
'';
reloadIfChanged = true;
});
createVswitchDevice = n: v: nameValuePair "${n}-netdev"
(let
deps = concatLists (map deviceDependency (attrNames (filterAttrs (_: config: config.type != "internal") v.interfaces)));
internalConfigs = concatMap (i: ["network-link-${i}.service" "network-addresses-${i}.service"]) (attrNames (filterAttrs (_: config: config.type == "internal") v.interfaces));
ofRules = pkgs.writeText "vswitch-${n}-openFlowRules" v.openFlowRules;
in
{ description = "Open vSwitch Interface ${n}";
wantedBy = [ "network-setup.service" (subsystemDevice n) ] ++ internalConfigs;
# before = [ "network-setup.service" ];
# should work without internalConfigs dependencies because address/link configuration depends
# on the device, which is created by ovs-vswitchd with type=internal, but it does not...
before = [ "network-setup.service" ] ++ internalConfigs;
partOf = [ "network-setup.service" ]; # shutdown the bridge when network is shutdown
bindsTo = [ "ovs-vswitchd.service" ]; # requires ovs-vswitchd to be alive at all times
after = [ "network-pre.target" "ovs-vswitchd.service" ] ++ deps; # start switch after physical interfaces and vswitch daemon
wants = deps; # if one or more interface fails, the switch should continue to run
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
path = [ pkgs.iproute config.virtualisation.vswitch.package ];
preStart = ''
echo "Resetting Open vSwitch ${n}..."
ovs-vsctl --if-exists del-br ${n} -- add-br ${n} \
-- set bridge ${n} protocols=${concatStringsSep "," v.supportedOpenFlowVersions}
'';
script = ''
echo "Configuring Open vSwitch ${n}..."
ovs-vsctl ${concatStrings (mapAttrsToList (name: config: " -- add-port ${n} ${name}" + optionalString (config.vlan != null) " tag=${toString config.vlan}") v.interfaces)} \
${concatStrings (mapAttrsToList (name: config: optionalString (config.type != null) " -- set interface ${name} type=${config.type}") v.interfaces)} \
${concatMapStrings (x: " -- set-controller ${n} " + x) v.controllers} \
${concatMapStrings (x: " -- " + x) (splitString "\n" v.extraOvsctlCmds)}
echo "Adding OpenFlow rules for Open vSwitch ${n}..."
ovs-ofctl --protocols=${v.openFlowVersion} add-flows ${n} ${ofRules}
'';
postStop = ''
echo "Cleaning Open vSwitch ${n}"
echo "Shuting down internal ${n} interface"
ip link set ${n} down || true
echo "Deleting flows for ${n}"
ovs-ofctl --protocols=${v.openFlowVersion} del-flows ${n} || true
echo "Deleting Open vSwitch ${n}"
ovs-vsctl --if-exists del-br ${n} || true
'';
});
createBondDevice = n: v: nameValuePair "${n}-netdev"
(let
deps = concatLists (map deviceDependency v.interfaces);
in
{ description = "Bond Interface ${n}";
wantedBy = [ "network-setup.service" (subsystemDevice n) ];
bindsTo = deps;
partOf = [ "network-setup.service" ];
after = [ "network-pre.target" ] ++ deps
++ concatMap (i: [ "network-addresses-${i}.service" "network-link-${i}.service" ]) v.interfaces;
before = [ "network-setup.service" ];
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
path = [ pkgs.iproute pkgs.gawk ];
script = ''
echo "Destroying old bond ${n}..."
${destroyBond n}
echo "Creating new bond ${n}..."
ip link add name "${n}" type bond \
${let opts = (mapAttrs (const toString)
(bondDeprecation.filterDeprecated v))
// v.driverOptions;
in concatStringsSep "\n"
(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 createNetworkLink interfaces ++
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: {});
}
];
}