nixpkgs/nixos/modules/tasks/network-interfaces-scripted.nix
2018-07-20 18:48:37 +00:00

516 lines
21 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: 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" ];
partOf = map (i: "network-addresses-${i.name}.service") 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 =
''
# 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 "$state"
'';
};
createTunDevice = i: nameValuePair "${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
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
''}
# 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 "${n}-netdev"
(let
deps = concatLists (map deviceDependency v.interfaces);
ofRules = pkgs.writeText "vswitch-${n}-openFlowRules" v.openFlowRules;
in
{ description = "Open vSwitch Interface ${n}";
wantedBy = [ "network-setup.service" "vswitchd.service" ] ++ deps;
bindsTo = [ "vswitchd.service" (subsystemDevice n) ] ++ deps;
partOf = [ "network-setup.service" "vswitchd.service" ];
after = [ "network-pre.target" "vswitchd.service" ] ++ deps;
before = [ "network-setup.service" ];
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
path = [ pkgs.iproute config.virtualisation.vswitch.package ];
script = ''
echo "Removing old Open vSwitch ${n}..."
ovs-vsctl --if-exists del-br ${n}
echo "Adding Open vSwitch ${n}..."
ovs-vsctl -- add-br ${n} ${concatMapStrings (i: " -- add-port ${n} ${i}") 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 add-flows ${n} ${ofRules}
'';
postStop = ''
ip link set ${n} down || true
ovs-ofctl del-flows ${n} || true
ovs-vsctl --if-exists del-br ${n}
'';
});
createBondDevice = n: v: nameValuePair "${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}"
ip link set "${n}" up
'';
postStop = ''
ip link delete "${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: {});
}
];
}