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Added ipv6 only support with flannel

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Signed-off-by: Roberto Bonafiglia <roberto.bonafiglia@suse.com>
This commit is contained in:
Roberto Bonafiglia 2022-03-04 18:06:29 +01:00
parent 93346904cf
commit 073f155fc4
3 changed files with 54 additions and 32 deletions
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27
pkg/agent/flannel/flannel.go
View File

@ -68,8 +68,10 @@ func flannel(ctx context.Context, flannelIface *net.Interface, flannelConf, kube
return err
}
go network.SetupAndEnsureIPTables(network.MasqRules(config.Network, bn.Lease()), 60)
go network.SetupAndEnsureIPTables(network.ForwardRules(config.Network.String()), 50)
if netMode == (ipv4+ipv6) || netMode == ipv4 {
go network.SetupAndEnsureIPTables(network.MasqRules(config.Network, bn.Lease()), 60)
go network.SetupAndEnsureIPTables(network.ForwardRules(config.Network.String()), 50)
}
if flannelIPv6Masq && config.IPv6Network.String() != emptyIPv6Network {
logrus.Debugf("Creating IPv6 masquerading iptables rules for %s network", config.IPv6Network.String())
@ -77,7 +79,7 @@ func flannel(ctx context.Context, flannelIface *net.Interface, flannelConf, kube
go network.SetupAndEnsureIP6Tables(network.ForwardRules(config.IPv6Network.String()), 50)
}
if err := WriteSubnetFile(subnetFile, config.Network, config.IPv6Network, true, bn); err != nil {
if err := WriteSubnetFile(subnetFile, config.Network, config.IPv6Network, true, bn, netMode); err != nil {
// Continue, even though it failed.
logrus.Warningf("Failed to write flannel subnet file: %s", err)
} else {
@ -97,8 +99,14 @@ func LookupExtInterface(iface *net.Interface, netMode int) (*backend.ExternalInt
if iface == nil {
logrus.Debug("No interface defined for flannel in the config. Fetching the default gateway interface")
if iface, err = ip.GetDefaultGatewayInterface(); err != nil {
return nil, fmt.Errorf("failed to get default interface: %s", err)
if netMode == ipv4 || netMode == (ipv4+ipv6) {
if iface, err = ip.GetDefaultGatewayInterface(); err != nil {
return nil, fmt.Errorf("failed to get default interface: %s", err)
}
} else {
if iface, err = ip.GetDefaultV6GatewayInterface(); err != nil {
return nil, fmt.Errorf("failed to get default interface: %s", err)
}
}
}
logrus.Debugf("The interface %s will be used by flannel", iface.Name)
@ -147,7 +155,7 @@ func LookupExtInterface(iface *net.Interface, netMode int) (*backend.ExternalInt
}, nil
}
func WriteSubnetFile(path string, nw ip.IP4Net, nwv6 ip.IP6Net, ipMasq bool, bn backend.Network) error {
func WriteSubnetFile(path string, nw ip.IP4Net, nwv6 ip.IP6Net, ipMasq bool, bn backend.Network, netMode int) error {
dir, name := filepath.Split(path)
os.MkdirAll(dir, 0755)
@ -161,9 +169,10 @@ func WriteSubnetFile(path string, nw ip.IP4Net, nwv6 ip.IP6Net, ipMasq bool, bn
// sn.IP by one
sn := bn.Lease().Subnet
sn.IP++
fmt.Fprintf(f, "FLANNEL_NETWORK=%s\n", nw)
fmt.Fprintf(f, "FLANNEL_SUBNET=%s\n", sn)
if netMode == ipv4 || netMode == (ipv4+ipv6) {
fmt.Fprintf(f, "FLANNEL_NETWORK=%s\n", nw)
fmt.Fprintf(f, "FLANNEL_SUBNET=%s\n", sn)
}
if nwv6.String() != emptyIPv6Network {
snv6 := bn.Lease().IPv6Subnet

56
pkg/agent/flannel/setup.go
View File

@ -46,6 +46,7 @@ const (
flannelConf = `{
"Network": "%CIDR%",
"EnableIPv6": %DUALSTACK%,
"EnableIPv4": %IPV4_ENABLED%,
"IPv6Network": "%CIDR_IPV6%",
"Backend": %backend%
}
@ -140,6 +141,7 @@ func createCNIConf(dir string) error {
}
func createFlannelConf(nodeConfig *config.Node) error {
var ipv4Enabled string
logrus.Debugf("Creating the flannel configuration for backend %s in file %s", nodeConfig.FlannelBackend, nodeConfig.FlannelConfFile)
if nodeConfig.FlannelConfFile == "" {
return errors.New("Flannel configuration not defined")
@ -148,7 +150,40 @@ func createFlannelConf(nodeConfig *config.Node) error {
logrus.Infof("Using custom flannel conf defined at %s", nodeConfig.FlannelConfFile)
return nil
}
confJSON := strings.ReplaceAll(flannelConf, "%CIDR%", nodeConfig.AgentConfig.ClusterCIDR.String())
netMode, err := findNetMode(nodeConfig.AgentConfig.ClusterCIDRs)
if err != nil {
logrus.Fatalf("Flannel error checking netMode: %v", err)
return err
}
if netMode == ipv4 || netMode == (ipv4+ipv6) {
ipv4Enabled = "true"
} else {
ipv4Enabled = "false"
}
confJSON := strings.ReplaceAll(flannelConf, "%IPV4_ENABLED%", ipv4Enabled)
if netMode == ipv4 {
confJSON = strings.ReplaceAll(confJSON, "%CIDR%", nodeConfig.AgentConfig.ClusterCIDR.String())
confJSON = strings.ReplaceAll(confJSON, "%DUALSTACK%", "false")
confJSON = strings.ReplaceAll(confJSON, "%CIDR_IPV6%", emptyIPv6Network)
} else if netMode == (ipv4 + ipv6) {
confJSON = strings.ReplaceAll(confJSON, "%CIDR%", nodeConfig.AgentConfig.ClusterCIDR.String())
confJSON = strings.ReplaceAll(confJSON, "%DUALSTACK%", "true")
for _, cidr := range nodeConfig.AgentConfig.ClusterCIDRs {
if utilsnet.IsIPv6(cidr.IP) {
// Only one ipv6 range available. This might change in future: https://github.com/kubernetes/enhancements/issues/2593
confJSON = strings.ReplaceAll(confJSON, "%CIDR_IPV6%", cidr.String())
}
}
} else {
confJSON = strings.ReplaceAll(confJSON, "%CIDR%", "0.0.0.0/0")
confJSON = strings.ReplaceAll(confJSON, "%DUALSTACK%", "true")
for _, cidr := range nodeConfig.AgentConfig.ClusterCIDRs {
if utilsnet.IsIPv6(cidr.IP) {
// Only one ipv6 range available. This might change in future: https://github.com/kubernetes/enhancements/issues/2593
confJSON = strings.ReplaceAll(confJSON, "%CIDR_IPV6%", cidr.String())
}
}
}
var backendConf string
@ -169,25 +204,6 @@ func createFlannelConf(nodeConfig *config.Node) error {
}
confJSON = strings.ReplaceAll(confJSON, "%backend%", backendConf)
netMode, err := findNetMode(nodeConfig.AgentConfig.ClusterCIDRs)
if err != nil {
logrus.Fatalf("Flannel error checking netMode: %v", err)
return err
}
if netMode == (ipv4 + ipv6) {
confJSON = strings.ReplaceAll(confJSON, "%DUALSTACK%", "true")
for _, cidr := range nodeConfig.AgentConfig.ClusterCIDRs {
if utilsnet.IsIPv6(cidr.IP) {
// Only one ipv6 range available. This might change in future: https://github.com/kubernetes/enhancements/issues/2593
confJSON = strings.ReplaceAll(confJSON, "%CIDR_IPV6%", cidr.String())
}
}
} else {
confJSON = strings.ReplaceAll(confJSON, "%DUALSTACK%", "false")
confJSON = strings.ReplaceAll(confJSON, "%CIDR_IPV6%", emptyIPv6Network)
}
logrus.Debugf("The flannel configuration is %s", confJSON)
return util.WriteFile(nodeConfig.FlannelConfFile, confJSON)
}

3
pkg/cli/server/server.go
View File

@ -534,9 +534,6 @@ func validateNetworkConfiguration(serverConfig server.Config) error {
if serverConfig.ControlConfig.DisableNPC == false {
return errors.New("network policy enforcement is not compatible with IPv6 only operation; server must be restarted with --disable-network-policy")
}
if serverConfig.ControlConfig.FlannelBackend != config.FlannelBackendNone {
return errors.New("Flannel is not compatible with IPv6 only operation; server must be restarted with --flannel-backend=none")
}
}
return nil