348 lines
13 KiB
Nix
348 lines
13 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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hasVirtuals = any (i: i.virtual) interfaces;
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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-${escapeSystemdPath interface}.device";
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interfaceIps = i:
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i.ip4 ++ optionals cfg.enableIPv6 i.ip6
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++ optional (i.ipAddress != null) {
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address = i.ipAddress;
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prefixLength = i.prefixLength;
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} ++ optional (cfg.enableIPv6 && i.ipv6Address != null) {
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address = i.ipv6Address;
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prefixLength = i.ipv6PrefixLength;
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};
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destroyBond = i: ''
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while true; do
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UPDATED=1
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SLAVES=$(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 "${i}" 2>/dev/null || true
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'';
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in
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{
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config = mkIf (!cfg.useNetworkd) {
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systemd.services =
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let
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networkLocalCommands = {
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after = [ "network-setup.service" ];
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bindsTo = [ "network-setup.service" ];
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};
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networkSetup =
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{ description = "Networking Setup";
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after = [ "network-interfaces.target" "network-pre.target" ];
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before = [ "network.target" ];
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wantedBy = [ "network.target" ];
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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path = [ pkgs.iproute ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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script =
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''
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# Set the static DNS configuration, if given.
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${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 ${ns}
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'')}
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EOF
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# Set the default gateway.
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${optionalString (cfg.defaultGateway != null && cfg.defaultGateway != "") ''
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# FIXME: get rid of "|| true" (necessary to make it idempotent).
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ip route add default via "${cfg.defaultGateway}" ${
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optionalString (cfg.defaultGatewayWindowSize != null)
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"window ${cfg.defaultGatewayWindowSize}"} || true
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''}
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${optionalString (cfg.defaultGateway6 != null && cfg.defaultGateway6 != "") ''
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# FIXME: get rid of "|| true" (necessary to make it idempotent).
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ip -6 route add ::/0 via "${cfg.defaultGateway6}" ${
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optionalString (cfg.defaultGatewayWindowSize != null)
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"window ${cfg.defaultGatewayWindowSize}"} || true
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''}
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'';
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};
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# For each interface <foo>, create a job ‘network-addresses-<foo>.service"
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# that performs static address configuration. It has a "wants"
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# dependency on ‘<foo>.service’, which is supposed to create
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# the interface and need not exist (i.e. for hardware
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# interfaces). It has a binds-to dependency on the actual
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# network device, so it only gets started after the interface
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# has appeared, and it's stopped when the interface
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# disappears.
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configureAddrs = i:
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let
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ips = interfaceIps i;
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in
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nameValuePair "network-addresses-${i.name}"
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{ description = "Addresss configuration of ${i.name}";
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wantedBy = [ "network-interfaces.target" ];
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before = [ "network-interfaces.target" ];
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bindsTo = [ (subsystemDevice i.name) ];
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after = [ (subsystemDevice i.name) "network-pre.target" ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute ];
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script =
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''
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echo "bringing up interface..."
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ip link set "${i.name}" up
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restart_network_interfaces=false
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'' + flip concatMapStrings (ips) (ip:
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let
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address = "${ip.address}/${toString ip.prefixLength}";
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in
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''
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echo "checking ip ${address}..."
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if out=$(ip addr add "${address}" dev "${i.name}" 2>&1); then
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echo "added ip ${address}..."
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restart_network_setup=true
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elif ! echo "$out" | grep "File exists" >/dev/null 2>&1; then
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echo "failed to add ${address}"
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exit 1
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fi
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'')
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+ optionalString (ips != [ ])
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''
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if [ "$restart_network_setup" = "true" ]; then
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# Ensure that the default gateway remains set.
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# (Flushing this interface may have removed it.)
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${config.systemd.package}/bin/systemctl try-restart --no-block network-setup.service
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fi
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${config.systemd.package}/bin/systemctl start ip-up.target
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'';
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preStop =
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''
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echo "releasing configured ip's..."
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'' + flip concatMapStrings (ips) (ip:
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let
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address = "${ip.address}/${toString ip.prefixLength}";
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in
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''
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echo -n "Deleting ${address}..."
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ip addr del "${address}" dev "${i.name}" >/dev/null 2>&1 || echo -n " Failed"
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echo ""
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'');
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};
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createTunDevice = i: nameValuePair "${i.name}-netdev"
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{ description = "Virtual Network Interface ${i.name}";
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requires = [ "dev-net-tun.device" ];
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after = [ "dev-net-tun.device" "network-pre.target" ];
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wantedBy = [ "network.target" (subsystemDevice i.name) ];
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before = [ "network-interfaces.target" (subsystemDevice i.name) ];
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path = [ pkgs.iproute ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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ip tuntap add dev "${i.name}" \
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${optionalString (i.virtualType != null) "mode ${i.virtualType}"} \
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user "${i.virtualOwner}"
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'';
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postStop = ''
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ip link del ${i.name}
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'';
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};
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createBridgeDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = map subsystemDevice v.interfaces;
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in
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{ description = "Bridge Interface ${n}";
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wantedBy = [ "network.target" (subsystemDevice n) ];
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bindsTo = deps;
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after = [ "network-pre.target" ] ++ deps
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++ concatMap (i: [ "network-addresses-${i}.service" "network-link-${i}.service" ]) v.interfaces;
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before = [ "network-interfaces.target" (subsystemDevice n) ];
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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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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 "${n}" || true
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'';
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});
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createBondDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = map subsystemDevice v.interfaces;
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in
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{ description = "Bond Interface ${n}";
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wantedBy = [ "network.target" (subsystemDevice n) ];
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bindsTo = deps;
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after = [ "network-pre.target" ] ++ deps
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++ concatMap (i: [ "network-addresses-${i}.service" "network-link-${i}.service" ]) v.interfaces;
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before = [ "network-interfaces.target" (subsystemDevice n) ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute pkgs.gawk ];
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script = ''
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echo "Destroying old bond ${n}..."
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${destroyBond n}
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echo "Creating new bond ${n}..."
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ip link add name "${n}" type bond \
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${optionalString (v.mode != null) "mode ${toString v.mode}"} \
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${optionalString (v.miimon != null) "miimon ${toString v.miimon}"} \
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${optionalString (v.xmit_hash_policy != null) "xmit_hash_policy ${toString v.xmit_hash_policy}"} \
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${optionalString (v.lacp_rate != null) "lacp_rate ${toString v.lacp_rate}"}
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# !!! There must be a better way to wait for the interface
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while [ ! -d "/sys/class/net/${n}" ]; do sleep 0.1; done;
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# Bring up the bond and enslave the specified interfaces
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ip link set "${n}" up
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${flip concatMapStrings v.interfaces (i: ''
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ip link set "${i}" down
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ip link set "${i}" master "${n}"
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'')}
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'';
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postStop = destroyBond n;
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});
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createMacvlanDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = [ (subsystemDevice v.interface) ];
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in
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{ description = "Vlan Interface ${n}";
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wantedBy = [ "network.target" (subsystemDevice n) ];
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bindsTo = deps;
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after = [ "network-pre.target" ] ++ deps;
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before = [ "network-interfaces.target" (subsystemDevice n) ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute ];
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script = ''
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# Remove Dead Interfaces
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ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
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ip link add link "${v.interface}" name "${n}" type macvlan \
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${optionalString (v.mode != null) "mode ${v.mode}"}
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ip link set "${n}" up
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'';
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postStop = ''
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ip link delete "${n}"
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'';
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});
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createSitDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = optional (v.dev != null) (subsystemDevice v.dev);
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in
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{ description = "6-to-4 Tunnel Interface ${n}";
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wantedBy = [ "network.target" (subsystemDevice n) ];
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bindsTo = deps;
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after = [ "network-pre.target" ] ++ deps;
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before = [ "network-interfaces.target" (subsystemDevice n) ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute ];
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script = ''
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# Remove Dead Interfaces
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ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
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ip link add name "${n}" type sit \
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${optionalString (v.remote != null) "remote \"${v.remote}\""} \
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${optionalString (v.local != null) "local \"${v.local}\""} \
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${optionalString (v.ttl != null) "ttl ${toString v.ttl}"} \
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${optionalString (v.dev != null) "dev \"${v.dev}\""}
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ip link set "${n}" up
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'';
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postStop = ''
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ip link delete "${n}"
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'';
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});
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createVlanDevice = n: v: nameValuePair "${n}-netdev"
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(let
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deps = [ (subsystemDevice v.interface) ];
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in
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{ description = "Vlan Interface ${n}";
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wantedBy = [ "network.target" (subsystemDevice n) ];
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bindsTo = deps;
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after = [ "network-pre.target" ] ++ deps;
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before = [ "network-interfaces.target" (subsystemDevice n) ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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path = [ pkgs.iproute ];
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script = ''
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# Remove Dead Interfaces
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ip link show "${n}" >/dev/null 2>&1 && ip link delete "${n}"
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ip link add link "${v.interface}" name "${n}" type vlan id "${toString v.id}"
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ip link set "${n}" up
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'';
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postStop = ''
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ip link delete "${n}"
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'';
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});
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in listToAttrs (
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map configureAddrs interfaces ++
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map createTunDevice (filter (i: i.virtual) interfaces))
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// mapAttrs' createBridgeDevice cfg.bridges
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// mapAttrs' createBondDevice cfg.bonds
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// mapAttrs' createMacvlanDevice cfg.macvlans
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// mapAttrs' createSitDevice cfg.sits
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// mapAttrs' createVlanDevice cfg.vlans
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// {
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"network-setup" = networkSetup;
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"network-local-commands" = networkLocalCommands;
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};
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services.udev.extraRules =
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''
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KERNEL=="tun", TAG+="systemd"
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'';
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};
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}
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