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agent_linux.go
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agent_linux.go
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//go:build linux
// +build linux
// Copyright 2020 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package agent
import (
"context"
"fmt"
"net"
"time"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/agent/config"
"antrea.io/antrea/pkg/agent/interfacestore"
"antrea.io/antrea/pkg/agent/util"
"antrea.io/antrea/pkg/apis/crd/v1alpha1"
"antrea.io/antrea/pkg/ovs/ovsconfig"
utilip "antrea.io/antrea/pkg/util/ip"
)
var (
// getInterfaceByName is meant to be overridden for testing.
getInterfaceByName = net.InterfaceByName
// setInterfaceARPAnnounce is meant to be overridden for testing.
setInterfaceARPAnnounce = util.EnsureARPAnnounceOnInterface
)
// prepareHostNetwork returns immediately on Linux.
func (i *Initializer) prepareHostNetwork() error {
return nil
}
// Assuming a page cache of 4096, based on Suricata source code from L1752-L1798
// at https://github.com/OISF/suricata/blob/49713ebaa0b8edb057d60f1cfe9126946645a848/src/source-af-packet.c#L1757C2-L1777C129.
// The maximum supported MTU by Suricata is 32678 after calculation.
const maxMTUSupportedBySuricata = 32678
// prepareOVSBridgeForK8sNode returns immediately on Linux if connectUplinkToBridge is false.
func (i *Initializer) prepareOVSBridgeForK8sNode() error {
if !i.connectUplinkToBridge {
return nil
}
klog.Infof("Preparing OVS bridge for AntreaFlexibleIPAM")
// Get uplink network configuration.
// TODO(gran): support IPv6
_, _, adapter, err := i.getNodeInterfaceFromIP(&utilip.DualStackIPs{IPv4: i.nodeConfig.NodeIPv4Addr.IP})
if err != nil {
return err
}
uplinkNetConfig := i.nodeConfig.UplinkNetConfig
uplinkNetConfig.Name = adapter.Name
uplinkNetConfig.MAC = adapter.HardwareAddr
// Gateway and DNSServers are not configured at adapter in Linux
// Limitation: dynamic DNS servers will be lost after DHCP lease expired
uplinkNetConfig.Gateway = ""
uplinkNetConfig.DNSServers = ""
// Set datapathID of OVS bridge.
// If no datapathID configured explicitly, the reconfiguration operation will change OVS bridge datapathID
// and break the OpenFlow channel.
datapathID := util.GenerateOVSDatapathID(uplinkNetConfig.MAC.String())
if err = i.ovsBridgeClient.SetDatapathID(datapathID); err != nil {
return fmt.Errorf("failed to set datapath_id %s: err=%w", datapathID, err)
}
if hostOFPort, err := i.ovsBridgeClient.GetOFPort(uplinkNetConfig.Name, false); err == nil {
klog.InfoS("OVS bridge local port already exists", "name", uplinkNetConfig.Name)
i.nodeConfig.HostInterfaceOFPort = uint32(hostOFPort)
// If local port exists, get the real uplink interface.
// This branch is used when antrea-agent had a hard restart (e.g. SIGKILL)
bridgedUplinkName := util.GenerateUplinkInterfaceName(uplinkNetConfig.Name)
if uplinkOFPort, err := i.ovsBridgeClient.GetOFPort(bridgedUplinkName, false); err != nil {
return fmt.Errorf("cannot find uplink port %s: err=%w", bridgedUplinkName, err)
} else {
uplinkNetConfig.OFPort = uint32(uplinkOFPort)
}
if adapter, err := getInterfaceByName(bridgedUplinkName); err != nil {
return fmt.Errorf("cannot find uplink interface %s: err=%w", bridgedUplinkName, err)
} else {
uplinkNetConfig.Index = adapter.Index
}
klog.InfoS("Found uplink", "Name", adapter.Name, "Index", uplinkNetConfig.Index, "ofPort", uplinkNetConfig.OFPort)
} else {
klog.InfoS("Using default OpenFlow port for uplink", "ofPort", config.DefaultUplinkOFPort)
uplinkNetConfig.OFPort = config.DefaultUplinkOFPort
klog.InfoS("Using default OpenFlow port for host interface", "ofPort", config.DefaultHostInterfaceOFPort)
i.nodeConfig.HostInterfaceOFPort = config.DefaultHostInterfaceOFPort
}
return nil
}
// getTunnelLocalIP returns local_ip of tunnel port.
// On linux platform, local_ip option is not needed.
func (i *Initializer) getTunnelPortLocalIP() net.IP {
return nil
}
func getTransportIPNetDeviceByName(ifaceName string, ovsBridgeName string) (*net.IPNet, *net.IPNet, *net.Interface, error) {
return util.GetIPNetDeviceByName(ifaceName)
}
func (i *Initializer) ConnectUplinkToOVSBridge() error {
// Return immediately on Linux if connectUplinkToBridge is false.
if !i.connectUplinkToBridge {
return nil
}
klog.InfoS("Bridging uplink to OVS bridge")
var err error
uplinkNetConfig := i.nodeConfig.UplinkNetConfig
externalIDs := map[string]interface{}{
interfacestore.AntreaInterfaceTypeKey: interfacestore.AntreaHost,
}
// We request the same MTU for the bridge interface as for the uplink adapter. If we don't,
// OVS will default to the lowest MTU among all existing bridge ports, including container
// ports. There may be some existing workloads with a lower MTU, and using that lower value
// may impact host connectivity.
bridgedUplinkName, exists, err := util.PrepareHostInterfaceConnection(
i.ovsBridgeClient,
uplinkNetConfig.Name,
int32(i.nodeConfig.HostInterfaceOFPort),
externalIDs,
i.nodeConfig.NodeTransportInterfaceMTU,
)
if err != nil {
return err
}
if exists {
return nil
}
// Create uplink port.
uplinkPortUUID, err := i.ovsBridgeClient.CreateUplinkPort(bridgedUplinkName, int32(uplinkNetConfig.OFPort), map[string]interface{}{interfacestore.AntreaInterfaceTypeKey: interfacestore.AntreaUplink})
if err != nil {
return fmt.Errorf("failed to add uplink port %s: err=%w", bridgedUplinkName, err)
}
// Add newly created uplinkInterface to interface cache.
uplinkInterface := interfacestore.NewUplinkInterface(bridgedUplinkName)
uplinkOFPort, err := i.ovsBridgeClient.GetOFPort(bridgedUplinkName, false)
if err != nil {
return fmt.Errorf("failed to get uplink ofport %s: err=%w", bridgedUplinkName, err)
}
klog.InfoS("Allocated OpenFlow port for uplink interface", "port", bridgedUplinkName, "ofPort", uplinkOFPort)
uplinkInterface.OVSPortConfig = &interfacestore.OVSPortConfig{uplinkPortUUID, uplinkOFPort} //nolint: govet
i.ifaceStore.AddInterface(uplinkInterface)
return nil
}
// RestoreOVSBridge returns immediately on Linux if connectUplinkToBridge is false.
// OVS is managed by Antrea in Linux, network config must be restored to uplink before Antrea Agent shutdown.
func (i *Initializer) RestoreOVSBridge() {
if !i.connectUplinkToBridge {
return
}
klog.InfoS("Restoring bridge config to uplink...")
if i.nodeConfig.UplinkNetConfig.Name != "" {
util.RestoreHostInterfaceConfiguration(i.ovsBridge, i.nodeConfig.UplinkNetConfig.Name)
klog.InfoS("Finished restoring bridge config to uplink...")
}
}
func (i *Initializer) setInterfaceMTU(iface string, mtu int) error {
return i.ovsBridgeClient.SetInterfaceMTU(iface, mtu)
}
func (i *Initializer) setVMNodeConfig(en *v1alpha1.ExternalNode, nodeName string) error {
i.nodeConfig = &config.NodeConfig{
Name: nodeName,
Type: config.ExternalNode,
OVSBridge: i.ovsBridge,
}
return nil
}
func (i *Initializer) prepareOVSBridgeForVM() error {
return i.setOVSDatapath()
}
func (i *Initializer) installVMInitialFlows() error {
return nil
}
// prepareL7EngineInterfaces creates two OVS internal ports. An application-aware engine will connect to OVS
// through these two ports.
func (i *Initializer) prepareL7EngineInterfaces() error {
trafficControlPortExternalIDs := map[string]interface{}{
interfacestore.AntreaInterfaceTypeKey: interfacestore.AntreaTrafficControl,
}
for _, portName := range []string{config.L7RedirectTargetPortName, config.L7RedirectReturnPortName} {
_, exists := i.ifaceStore.GetInterface(portName)
if exists {
continue
}
portUUID, err := i.ovsBridgeClient.CreateInternalPort(portName, ovsconfig.AutoAssignedOFPort, "", trafficControlPortExternalIDs)
if err != nil {
return err
}
if pollErr := wait.PollUntilContextTimeout(context.TODO(), time.Second, 5*time.Second, true, func(ctx context.Context) (bool, error) {
_, _, err := util.SetLinkUp(portName)
if err == nil {
return true, nil
}
if _, ok := err.(util.LinkNotFound); ok {
return false, nil
}
return false, err
}); pollErr != nil {
return pollErr
}
ofPort, err := i.ovsBridgeClient.GetOFPort(portName, false)
if err != nil {
return err
}
itf := interfacestore.NewTrafficControlInterface(portName, &interfacestore.OVSPortConfig{PortUUID: portUUID, OFPort: ofPort})
i.ifaceStore.AddInterface(itf)
}
targetPort, _ := i.ifaceStore.GetInterfaceByName(config.L7RedirectTargetPortName)
returnPort, _ := i.ifaceStore.GetInterfaceByName(config.L7RedirectReturnPortName)
i.l7NetworkPolicyConfig.TargetOFPort = uint32(targetPort.OFPort)
i.l7NetworkPolicyConfig.ReturnOFPort = uint32(returnPort.OFPort)
// Set the ports with no-flood to reject ARP flood packets at every startup.
if err := i.ovsCtlClient.SetPortNoFlood(int(targetPort.OFPort)); err != nil {
return fmt.Errorf("failed to set port %s with no-flood config: %w", config.L7RedirectTargetPortName, err)
}
if err := i.ovsCtlClient.SetPortNoFlood(int(returnPort.OFPort)); err != nil {
return fmt.Errorf("failed to set port %s with no-flood config: %w", config.L7RedirectReturnPortName, err)
}
// Set MTU of the ports to the calculated MTU value at every startup.
if err := i.setInterfaceMTU(config.L7RedirectTargetPortName, i.networkConfig.InterfaceMTU); err != nil {
return err
}
if err := i.setInterfaceMTU(config.L7RedirectReturnPortName, i.networkConfig.InterfaceMTU); err != nil {
return err
}
// Currently, the maximum of MTU supported by L7 NetworkPolicy engine Suricata is 32678 (assuming that the page size
// is 4096). If the calculated MTU value is greater than 32678, Suricata may fail to start.
if i.networkConfig.InterfaceMTU > maxMTUSupportedBySuricata {
klog.ErrorS(nil, "L7 NetworkPolicy engine Suricata may fail to start since the interface MTU is greater than the maximum MTU supported by Suricata", "interfaceMTU", i.networkConfig.InterfaceMTU, "maximumMTU", maxMTUSupportedBySuricata)
}
return nil
}