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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 (
"fmt"
"net"
"strings"
"time"
"github.com/vishvananda/netlink"
"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"
utilip "antrea.io/antrea/pkg/util/ip"
)
// prepareHostNetwork returns immediately on Linux.
func (i *Initializer) prepareHostNetwork() error {
return nil
}
// 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
uplinkNetConfig.IPs = []*net.IPNet{i.nodeConfig.NodeIPv4Addr}
uplinkNetConfig.Index = adapter.Index
// 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 = ""
// Save routes which are configured on the uplink interface.
// The routes on the host will be lost when moving the network configuration of the uplink interface
// to the OVS bridge local interface. The saved routes will be restored on host after that.
if err = i.saveHostRoutes(); err != nil {
return err
}
// Set datapathID of OVS bridge.
// If no datapathID configured explicitly, the reconfiguration operation will change OVS bridge datapathID
// and break the OpenFlow channel.
// The length of datapathID is 64 bits, the lower 48-bits are for a MAC address, while the upper 16-bits are
// implementer-defined. Antrea uses "0x0000" for the upper 16-bits.
datapathID := strings.Replace(uplinkNetConfig.MAC.String(), ":", "", -1)
datapathID = "0000" + datapathID
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.Infof("OVS bridge local port %s already exists", 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 := net.InterfaceByName(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 {
freePort, err := i.ovsBridgeClient.AllocateOFPort(config.UplinkOFPort)
if err != nil {
return err
}
uplinkNetConfig.OFPort = uint32(freePort)
klog.InfoS("Set OpenFlow port in UplinkNetConfig", "ofport", uplinkNetConfig.OFPort)
freePort, err = i.ovsBridgeClient.AllocateOFPort(config.UplinkOFPort)
if err != nil {
return err
}
i.nodeConfig.HostInterfaceOFPort = uint32(freePort)
klog.InfoS("Set host interface", "ofport", i.nodeConfig.HostInterfaceOFPort)
}
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)
}
// saveHostRoutes saves routes which are configured on uplink interface before
// the interface the configured as the uplink of antrea network.
// The routes will be restored on OVS bridge interface after the IP configuration
// is moved to the OVS bridge.
func (i *Initializer) saveHostRoutes() error {
routes, err := netlink.RouteList(nil, netlink.FAMILY_V4)
if err != nil {
return err
}
for _, route := range routes {
if route.LinkIndex != i.nodeConfig.UplinkNetConfig.Index {
klog.V(2).Infof("Skipped host route not on uplink: %+v", route)
continue
}
// Skip IPv6 routes before we support IPv6 stack.
// TODO(gran): support IPv6
if route.Gw.To4() == nil {
klog.V(2).Infof("Skipped IPv6 host route: %+v", route)
continue
}
klog.Infof("Got host route=%+v", route)
i.nodeConfig.UplinkNetConfig.Routes = append(i.nodeConfig.UplinkNetConfig.Routes, route)
}
return nil
}
// restoreHostRoutes restores the host routes which are lost when moving the IP
// configuration of uplink interface to the OVS bridge interface during
// the antrea network initialize stage.
// The backup routes are restored after the IP configuration change.
func (i *Initializer) restoreHostRoutes() error {
return i.restoreHostRoutesToInterface(i.nodeConfig.UplinkNetConfig.Name)
}
func (i *Initializer) restoreHostRoutesToInterface(ifaceName string) error {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return nil
}
for _, routeInterface := range i.nodeConfig.UplinkNetConfig.Routes {
route := routeInterface.(netlink.Route)
newRoute := route
newRoute.LinkIndex = iface.Index
if err := netlink.RouteReplace(&newRoute); err != nil {
return err
}
}
return nil
}
func (i *Initializer) ConnectUplinkToOVSBridge() error {
// Return immediately on Linux if connectUplinkToBridge is false.
if !i.connectUplinkToBridge {
return nil
}
klog.Infof("Bridging uplink to OVS bridge")
var err error
uplinkNetConfig := i.nodeConfig.UplinkNetConfig
uplinkName := uplinkNetConfig.Name
bridgedUplinkName := util.GenerateUplinkInterfaceName(uplinkNetConfig.Name)
// If uplink is already exists, return.
if uplinkOFPort, err := i.ovsBridgeClient.GetOFPort(bridgedUplinkName, false); err == nil {
klog.InfoS("Uplink already exists, skip the configuration", "uplink", bridgedUplinkName, "port", uplinkOFPort)
return nil
}
uplinkIPs, err := util.GetAllIPNetsByName(uplinkName)
if err != nil {
return fmt.Errorf("failed to get uplink IPs: err=%w", err)
}
if err := util.RenameInterface(uplinkName, bridgedUplinkName); err != nil {
return fmt.Errorf("failed to change uplink interface name: err=%w", err)
}
// 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)
// Create local port.
externalIDs := map[string]interface{}{
interfacestore.AntreaInterfaceTypeKey: interfacestore.AntreaHost,
}
if _, err = i.ovsBridgeClient.CreateInternalPort(uplinkName, int32(i.nodeConfig.HostInterfaceOFPort), uplinkNetConfig.MAC.String(), externalIDs); err != nil {
return fmt.Errorf("cannot create host interface port %s: err=%w", uplinkName, err)
}
// Move network configuration of uplink interface to OVS bridge local interface.
// The net configuration of uplink will be restored by RestoreOVSBridge when shutting down.
wait.PollImmediate(100*time.Millisecond, 10000*time.Millisecond, func() (bool, error) {
// Wait a few seconds for OVS bridge local port.
link, err := netlink.LinkByName(uplinkName)
if err != nil {
klog.V(4).InfoS("OVS bridge local port is not ready", "port", uplinkName, "err", err)
return false, nil
}
klog.InfoS("OVS bridge local port is ready", "type", link.Type(), "attrs", link.Attrs())
return true, nil
})
localLink, err := netlink.LinkByName(uplinkName)
if err != nil {
return err
}
if _, _, err = util.SetLinkUp(uplinkName); err != nil {
return err
}
if err = util.ConfigureLinkAddresses(localLink.Attrs().Index, uplinkIPs); err != nil {
return err
}
if err = util.ConfigureLinkAddresses(uplinkNetConfig.Index, nil); err != nil {
return err
}
// Restore the host routes which are lost when moving the network configuration of the uplink interface to OVS bridge interface.
if err = i.restoreHostRoutes(); err != nil {
return err
}
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.Infof("Restoring bridge config to uplink...")
uplinkNetConfig := i.nodeConfig.UplinkNetConfig
uplinkName := ""
bridgedUplinkName := ""
if uplinkNetConfig != nil {
uplinkName = uplinkNetConfig.Name
bridgedUplinkName = util.GenerateUplinkInterfaceName(uplinkName)
}
brName := i.ovsBridge
if uplinkName != "" {
uplinkIPs, err := util.GetAllIPNetsByName(uplinkName)
if err != nil {
klog.ErrorS(err, "Failed to get uplink IPs")
}
if err := util.DeleteOVSPort(brName, uplinkName); err != nil {
klog.ErrorS(err, "Delete OVS port failed", "port", uplinkName)
}
if err := util.DeleteOVSPort(brName, bridgedUplinkName); err != nil {
klog.ErrorS(err, "Delete OVS port failed", "port", bridgedUplinkName)
}
if err := util.RenameInterface(bridgedUplinkName, uplinkName); err != nil {
klog.ErrorS(err, "Restore uplink name failed", "uplink", bridgedUplinkName)
}
if err := util.ConfigureLinkAddresses(uplinkNetConfig.Index, uplinkIPs); err != nil {
klog.ErrorS(err, "Configure IP to uplink failed", "uplink", uplinkName)
}
if err := i.restoreHostRoutesToInterface(uplinkName); err != nil {
klog.ErrorS(err, "Configure route to uplink interface failed", "uplink", uplinkName)
}
}
klog.Infof("Finished to restore 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
}