func (n *bridgeNetwork) setupFirewalld(config *networkConfiguration, i *bridgeInterface) error {
// Sanity check.
if config.EnableIPTables == false {
return IPTableCfgError(config.BridgeName)
}
iptables.OnReloaded(func() { n.setupIPTables(config, i) })
iptables.OnReloaded(n.portMapper.ReMapAll)
return nil
}
func setupIPForwarding(enableIPTables bool) error {
// Get current IPv4 forward setup
ipv4ForwardData, err := ioutil.ReadFile(ipv4ForwardConf)
if err != nil {
return fmt.Errorf("Cannot read IP forwarding setup: %v", err)
}
// Enable IPv4 forwarding only if it is not already enabled
if ipv4ForwardData[0] != '1' {
// Enable IPv4 forwarding
if err := configureIPForwarding(true); err != nil {
return fmt.Errorf("Enabling IP forwarding failed: %v", err)
}
// When enabling ip_forward set the default policy on forward chain to
// drop only if the daemon option iptables is not set to false.
if !enableIPTables {
return nil
}
if err := iptables.SetDefaultPolicy(iptables.Filter, "FORWARD", iptables.Drop); err != nil {
if err := configureIPForwarding(false); err != nil {
logrus.Errorf("Disabling IP forwarding failed, %v", err)
}
return err
}
iptables.OnReloaded(func() {
logrus.Debug("Setting the default DROP policy on firewall reload")
if err := iptables.SetDefaultPolicy(iptables.Filter, "FORWARD", iptables.Drop); err != nil {
logrus.Warnf("Settig the default DROP policy on firewall reload failed, %v", err)
}
})
}
return nil
}
func (d *driver) configure(option map[string]interface{}) error {
var (
config *configuration
err error
natChain *iptables.ChainInfo
filterChain *iptables.ChainInfo
isolationChain *iptables.ChainInfo
)
genericData, ok := option[netlabel.GenericData]
if !ok || genericData == nil {
return nil
}
switch opt := genericData.(type) {
case options.Generic:
opaqueConfig, err := options.GenerateFromModel(opt, &configuration{})
if err != nil {
return err
}
config = opaqueConfig.(*configuration)
case *configuration:
config = opt
default:
return &ErrInvalidDriverConfig{}
}
if config.EnableIPForwarding {
err = setupIPForwarding()
if err != nil {
return err
}
}
if config.EnableIPTables {
removeIPChains()
natChain, filterChain, isolationChain, err = setupIPChains(config)
if err != nil {
return err
}
// Make sure on firewall reload, first thing being re-played is chains creation
iptables.OnReloaded(func() { logrus.Debugf("Recreating iptables chains on firewall reload"); setupIPChains(config) })
}
d.Lock()
d.natChain = natChain
d.filterChain = filterChain
d.isolationChain = isolationChain
d.config = config
d.Unlock()
err = d.initStore(option)
if err != nil {
return err
}
return nil
}
func (l *link) Enable() error {
// -A == iptables append flag
linkFunction := func() error {
return linkContainers("-A", l.parentIP, l.childIP, l.ports, l.bridge, false)
}
iptables.OnReloaded(func() { linkFunction() })
return linkFunction()
}
func (d *driver) configure(option map[string]interface{}) error {
var (
config *configuration
err error
natChain *iptables.ChainInfo
filterChain *iptables.ChainInfo
isolationChain *iptables.ChainInfo
)
genericData, ok := option[netlabel.GenericData]
if !ok || genericData == nil {
return nil
}
switch opt := genericData.(type) {
case options.Generic:
opaqueConfig, err := options.GenerateFromModel(opt, &configuration{})
if err != nil {
return err
}
config = opaqueConfig.(*configuration)
case *configuration:
config = opt
default:
return &ErrInvalidDriverConfig{}
}
if config.EnableIPForwarding {
err = setupIPForwarding()
if err != nil {
return err
}
}
if config.EnableIPTables {
if _, err := os.Stat("/proc/sys/net/bridge"); err != nil {
if out, err := exec.Command("modprobe", "-va", "bridge", "br_netfilter").CombinedOutput(); err != nil {
logrus.Warnf("Running modprobe bridge br_netfilter failed with message: %s, error: %v", out, err)
}
}
removeIPChains()
natChain, filterChain, isolationChain, err = setupIPChains(config)
if err != nil {
return err
}
// Make sure on firewall reload, first thing being re-played is chains creation
iptables.OnReloaded(func() { logrus.Debugf("Recreating iptables chains on firewall reload"); setupIPChains(config) })
}
d.Lock()
d.natChain = natChain
d.filterChain = filterChain
d.isolationChain = isolationChain
d.config = config
d.Unlock()
err = d.initStore(option)
if err != nil {
return err
}
return nil
}