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gateway_localnet.go
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gateway_localnet.go
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//go:build linux
// +build linux
package node
import (
"fmt"
"net"
"strings"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/config"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/factory"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/kube"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/node/routemanager"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/types"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/util"
kerrors2 "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/klog/v2"
utilnet "k8s.io/utils/net"
)
func newLocalGateway(nodeName string, hostSubnets []*net.IPNet, gwNextHops []net.IP, gwIntf, egressGWIntf string, gwIPs []*net.IPNet,
nodeAnnotator kube.Annotator, cfg *managementPortConfig, kube kube.Interface, watchFactory factory.NodeWatchFactory,
routeManager *routemanager.Controller) (*gateway, error) {
klog.Info("Creating new local gateway")
gw := &gateway{}
for _, hostSubnet := range hostSubnets {
// local gateway mode uses mp0 as default path for all ingress traffic into OVN
var nextHop *net.IPNet
if utilnet.IsIPv6CIDR(hostSubnet) {
nextHop = cfg.ipv6.ifAddr
} else {
nextHop = cfg.ipv4.ifAddr
}
// add iptables masquerading for mp0 to exit the host for egress
cidr := nextHop.IP.Mask(nextHop.Mask)
cidrNet := &net.IPNet{IP: cidr, Mask: nextHop.Mask}
err := initLocalGatewayNATRules(cfg.ifName, cidrNet)
if err != nil {
return nil, fmt.Errorf("failed to add local NAT rules for: %s, err: %v", cfg.ifName, err)
}
}
gwBridge, exGwBridge, err := gatewayInitInternal(
nodeName, gwIntf, egressGWIntf, gwNextHops, gwIPs, nodeAnnotator)
if err != nil {
return nil, err
}
if exGwBridge != nil {
gw.readyFunc = func() (bool, error) {
ready, err := gatewayReady(gwBridge.patchPort)
if err != nil {
return false, err
}
exGWReady, err := gatewayReady(exGwBridge.patchPort)
if err != nil {
return false, err
}
return ready && exGWReady, nil
}
} else {
gw.readyFunc = func() (bool, error) {
return gatewayReady(gwBridge.patchPort)
}
}
gw.initFunc = func() error {
klog.Info("Creating Local Gateway Openflow Manager")
err := setBridgeOfPorts(gwBridge)
if err != nil {
return err
}
if exGwBridge != nil {
err = setBridgeOfPorts(exGwBridge)
if err != nil {
return err
}
if config.Gateway.DisableForwarding {
if err := initExternalBridgeDropForwardingRules(exGwBridge.bridgeName); err != nil {
return fmt.Errorf("failed to add forwarding block rules for bridge %s: err %v", exGwBridge.bridgeName, err)
}
}
}
gw.nodeIPManager = newAddressManager(nodeName, kube, cfg, watchFactory, gwBridge)
if err := setNodeMasqueradeIPOnExtBridge(gwBridge.bridgeName); err != nil {
return fmt.Errorf("failed to set the node masquerade IP on the ext bridge %s: %v", gwBridge.bridgeName, err)
}
if err := addMasqueradeRoute(routeManager, gwBridge.bridgeName, nodeName, gwIPs, watchFactory); err != nil {
return fmt.Errorf("failed to set the node masquerade route to OVN: %v", err)
}
gw.openflowManager, err = newGatewayOpenFlowManager(gwBridge, exGwBridge, hostSubnets, gw.nodeIPManager.ListAddresses())
if err != nil {
return err
}
// resync flows on IP change
gw.nodeIPManager.OnChanged = func() {
klog.V(5).Info("Node addresses changed, re-syncing bridge flows")
if err := gw.openflowManager.updateBridgeFlowCache(hostSubnets, gw.nodeIPManager.ListAddresses()); err != nil {
// very unlikely - somehow node has lost its IP address
klog.Errorf("Failed to re-generate gateway flows after address change: %v", err)
}
// update gateway IPs for service openflows programmed by nodePortWatcher interface
npw, _ := gw.nodePortWatcher.(*nodePortWatcher)
npw.updateGatewayIPs(gw.nodeIPManager)
// Services create OpenFlow flows as well, need to update them all
if gw.servicesRetryFramework != nil {
if errs := gw.addAllServices(); errs != nil {
err := kerrors2.NewAggregate(errs)
klog.Errorf("Failed to sync all services after node IP change: %v", err)
}
}
gw.openflowManager.requestFlowSync()
}
if config.Gateway.NodeportEnable {
if config.OvnKubeNode.Mode == types.NodeModeFull {
// (TODO): Internal Traffic Policy is not supported in DPU mode
if err := initSvcViaMgmPortRoutingRules(hostSubnets); err != nil {
return err
}
}
gw.nodePortWatcher, err = newNodePortWatcher(gwBridge, gw.openflowManager, gw.nodeIPManager, watchFactory)
if err != nil {
return err
}
} else {
// no service OpenFlows, request to sync flows now.
gw.openflowManager.requestFlowSync()
}
if err := addHostMACBindings(gwBridge.bridgeName); err != nil {
return fmt.Errorf("failed to add MAC bindings for service routing")
}
return nil
}
gw.watchFactory = watchFactory.(*factory.WatchFactory)
klog.Info("Local Gateway Creation Complete")
return gw, nil
}
func getGatewayFamilyAddrs(gatewayIfAddrs []*net.IPNet) (string, string) {
var gatewayIPv4, gatewayIPv6 string
for _, gatewayIfAddr := range gatewayIfAddrs {
if utilnet.IsIPv6(gatewayIfAddr.IP) {
gatewayIPv6 = gatewayIfAddr.IP.String()
} else {
gatewayIPv4 = gatewayIfAddr.IP.String()
}
}
return gatewayIPv4, gatewayIPv6
}
func getLocalAddrs() (map[string]net.IPNet, error) {
localAddrSet := make(map[string]net.IPNet)
addrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
for _, addr := range addrs {
ip, ipNet, err := net.ParseCIDR(addr.String())
if err != nil {
return nil, err
}
localAddrSet[ip.String()] = *ipNet
}
klog.V(5).Infof("Node local addresses initialized to: %v", localAddrSet)
return localAddrSet, nil
}
func cleanupLocalnetGateway(physnet string) error {
stdout, stderr, err := util.RunOVSVsctl("--if-exists", "get", "Open_vSwitch", ".",
"external_ids:ovn-bridge-mappings")
if err != nil {
return fmt.Errorf("failed to get ovn-bridge-mappings stderr:%s (%v)", stderr, err)
}
bridgeMappings := strings.Split(stdout, ",")
for _, bridgeMapping := range bridgeMappings {
m := strings.Split(bridgeMapping, ":")
if physnet == m[0] {
bridgeName := m[1]
_, stderr, err = util.RunOVSVsctl("--", "--if-exists", "del-br", bridgeName)
if err != nil {
return fmt.Errorf("failed to ovs-vsctl del-br %s stderr:%s (%v)", bridgeName, stderr, err)
}
break
}
}
return err
}