func (l *Link) Disable() {
// We do not care about errors here because the link may not
// exist in iptables
// -D == iptables delete flag
l.toggle("-D", true)
// call this on Firewalld reload
iptables.OnReloaded(func() { l.toggle("-D", true) })
l.IsEnabled = false
}
func (l *Link) Enable() error {
// -A == iptables append flag
if err := l.toggle("-A", false); err != nil {
return err
}
// call this on Firewalld reload
iptables.OnReloaded(func() { l.toggle("-I", false) })
l.IsEnabled = true
return nil
}
func InitDriver(config *Config) error {
var (
networkv4 *net.IPNet
networkv6 *net.IPNet
addrv4 net.Addr
addrsv6 []net.Addr
bridgeIPv6 = "fe80::1/64"
)
// try to modprobe bridge first
// see gh#12177
if out, err := exec.Command("modprobe", "-va", "bridge", "nf_nat", "br_netfilter").Output(); err != nil {
logrus.Warnf("Running modprobe bridge nf_nat failed with message: %s, error: %v", out, err)
}
initPortMapper()
if config.DefaultIp != nil {
defaultBindingIP = config.DefaultIp
}
hairpinMode = !config.EnableUserlandProxy
bridgeIface = config.Iface
usingDefaultBridge := false
if bridgeIface == "" {
usingDefaultBridge = true
bridgeIface = DefaultNetworkBridge
}
addrv4, addrsv6, err := networkdriver.GetIfaceAddr(bridgeIface)
if err != nil {
// No Bridge existent, create one
// If we're not using the default bridge, fail without trying to create it
if !usingDefaultBridge {
return err
}
logrus.Info("Bridge interface not found, trying to create it")
// If the iface is not found, try to create it
if err := configureBridge(config.IP, bridgeIPv6, config.EnableIPv6); err != nil {
logrus.Errorf("Could not configure Bridge: %s", err)
return err
}
addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
if err != nil {
return err
}
if config.FixedCIDRv6 != "" {
// Setting route to global IPv6 subnet
logrus.Infof("Adding route to IPv6 network %q via device %q", config.FixedCIDRv6, bridgeIface)
if err := netlink.AddRoute(config.FixedCIDRv6, "", "", bridgeIface); err != nil {
logrus.Fatalf("Could not add route to IPv6 network %q via device %q", config.FixedCIDRv6, bridgeIface)
}
}
} else {
// Bridge exists already, getting info...
// Validate that the bridge ip matches the ip specified by BridgeIP
if config.IP != "" {
networkv4 = addrv4.(*net.IPNet)
bip, _, err := net.ParseCIDR(config.IP)
if err != nil {
return err
}
if !networkv4.IP.Equal(bip) {
return fmt.Errorf("Bridge ip (%s) does not match existing bridge configuration %s", networkv4.IP, bip)
}
}
// A bridge might exist but not have any IPv6 addr associated with it yet
// (for example, an existing Docker installation that has only been used
// with IPv4 and docker0 already is set up) In that case, we can perform
// the bridge init for IPv6 here, else we will error out below if --ipv6=true
if len(addrsv6) == 0 && config.EnableIPv6 {
if err := setupIPv6Bridge(bridgeIPv6); err != nil {
return err
}
// Recheck addresses now that IPv6 is setup on the bridge
addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
if err != nil {
return err
}
}
// TODO: Check if route to config.FixedCIDRv6 is set
}
if config.EnableIPv6 {
bip6, _, err := net.ParseCIDR(bridgeIPv6)
if err != nil {
return err
}
found := false
for _, addrv6 := range addrsv6 {
networkv6 = addrv6.(*net.IPNet)
if networkv6.IP.Equal(bip6) {
found = true
break
}
}
if !found {
return fmt.Errorf("Bridge IPv6 does not match existing bridge configuration %s", bip6)
}
}
networkv4 = addrv4.(*net.IPNet)
if config.EnableIPv6 {
if len(addrsv6) == 0 {
return errors.New("IPv6 enabled but no IPv6 detected")
}
bridgeIPv6Addr = networkv6.IP
}
if config.EnableIptables {
if err := iptables.FirewalldInit(); err != nil {
logrus.Debugf("Error initializing firewalld: %v", err)
}
}
// Configure iptables for link support
if config.EnableIptables {
if err := setupIPTables(addrv4, config.InterContainerCommunication, config.EnableIpMasq); err != nil {
logrus.Errorf("Error configuring iptables: %s", err)
return err
}
// call this on Firewalld reload
iptables.OnReloaded(func() { setupIPTables(addrv4, config.InterContainerCommunication, config.EnableIpMasq) })
}
if config.EnableIpForward {
// Enable IPv4 forwarding
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte{'1', '\n'}, 0644); err != nil {
logrus.Warnf("Unable to enable IPv4 forwarding: %v", err)
}
if config.FixedCIDRv6 != "" {
// Enable IPv6 forwarding
if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/default/forwarding", []byte{'1', '\n'}, 0644); err != nil {
logrus.Warnf("Unable to enable IPv6 default forwarding: %v", err)
}
if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/all/forwarding", []byte{'1', '\n'}, 0644); err != nil {
logrus.Warnf("Unable to enable IPv6 all forwarding: %v", err)
}
}
}
if hairpinMode {
// Enable loopback adresses routing
sysPath := filepath.Join("/proc/sys/net/ipv4/conf", bridgeIface, "route_localnet")
if err := ioutil.WriteFile(sysPath, []byte{'1', '\n'}, 0644); err != nil {
logrus.Warnf("Unable to enable local routing for hairpin mode: %v", err)
}
}
// We can always try removing the iptables
if err := iptables.RemoveExistingChain("DOCKER", iptables.Nat); err != nil {
return err
}
if config.EnableIptables {
_, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Nat, hairpinMode)
if err != nil {
return err
}
// call this on Firewalld reload
iptables.OnReloaded(func() { iptables.NewChain("DOCKER", bridgeIface, iptables.Nat, hairpinMode) })
chain, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Filter, hairpinMode)
if err != nil {
return err
}
// call this on Firewalld reload
iptables.OnReloaded(func() { iptables.NewChain("DOCKER", bridgeIface, iptables.Filter, hairpinMode) })
portMapper.SetIptablesChain(chain)
}
bridgeIPv4Network = networkv4
if config.FixedCIDR != "" {
_, subnet, err := net.ParseCIDR(config.FixedCIDR)
if err != nil {
return err
}
logrus.Debugf("Subnet: %v", subnet)
if err := ipAllocator.RegisterSubnet(bridgeIPv4Network, subnet); err != nil {
logrus.Errorf("Error registering subnet for IPv4 bridge network: %s", err)
return err
}
}
if gateway, err := requestDefaultGateway(config.DefaultGatewayIPv4, bridgeIPv4Network); err != nil {
return err
} else {
gatewayIPv4 = gateway
}
if config.FixedCIDRv6 != "" {
_, subnet, err := net.ParseCIDR(config.FixedCIDRv6)
if err != nil {
return err
}
logrus.Debugf("Subnet: %v", subnet)
if err := ipAllocator.RegisterSubnet(subnet, subnet); err != nil {
logrus.Errorf("Error registering subnet for IPv6 bridge network: %s", err)
return err
}
globalIPv6Network = subnet
if gateway, err := requestDefaultGateway(config.DefaultGatewayIPv6, globalIPv6Network); err != nil {
return err
} else {
gatewayIPv6 = gateway
}
}
// Block BridgeIP in IP allocator
ipAllocator.RequestIP(bridgeIPv4Network, bridgeIPv4Network.IP)
if config.EnableIptables {
iptables.OnReloaded(portMapper.ReMapAll) // call this on Firewalld reload
}
return nil
}