func (plugin *kubenetNetworkPlugin) Init(host network.Host, hairpinMode componentconfig.HairpinMode, nonMasqueradeCIDR string, mtu int) error {
plugin.host = host
plugin.hairpinMode = hairpinMode
plugin.nonMasqueradeCIDR = nonMasqueradeCIDR
plugin.cniConfig = &libcni.CNIConfig{
Path: []string{DefaultCNIDir, plugin.vendorDir},
}
if mtu == network.UseDefaultMTU {
if link, err := findMinMTU(); err == nil {
plugin.mtu = link.MTU
glog.V(5).Infof("Using interface %s MTU %d as bridge MTU", link.Name, link.MTU)
} else {
plugin.mtu = fallbackMTU
glog.Warningf("Failed to find default bridge MTU, using %d: %v", fallbackMTU, err)
}
} else {
plugin.mtu = mtu
}
// Since this plugin uses a Linux bridge, set bridge-nf-call-iptables=1
// is necessary to ensure kube-proxy functions correctly.
//
// This will return an error on older kernel version (< 3.18) as the module
// was built-in, we simply ignore the error here. A better thing to do is
// to check the kernel version in the future.
plugin.execer.Command("modprobe", "br-netfilter").CombinedOutput()
err := plugin.sysctl.SetSysctl(sysctlBridgeCallIPTables, 1)
if err != nil {
glog.Warningf("can't set sysctl %s: %v", sysctlBridgeCallIPTables, err)
}
plugin.loConfig, err = libcni.ConfFromBytes([]byte(`{
"cniVersion": "0.1.0",
"name": "kubenet-loopback",
"type": "loopback"
}`))
if err != nil {
return fmt.Errorf("Failed to generate loopback config: %v", err)
}
plugin.nsenterPath, err = plugin.execer.LookPath("nsenter")
if err != nil {
return fmt.Errorf("Failed to find nsenter binary: %v", err)
}
// Need to SNAT outbound traffic from cluster
if err = plugin.ensureMasqRule(); err != nil {
return err
}
return nil
}
func (plugin *kubenetNetworkPlugin) Event(name string, details map[string]interface{}) {
if name != network.NET_PLUGIN_EVENT_POD_CIDR_CHANGE {
return
}
plugin.mu.Lock()
defer plugin.mu.Unlock()
podCIDR, ok := details[network.NET_PLUGIN_EVENT_POD_CIDR_CHANGE_DETAIL_CIDR].(string)
if !ok {
glog.Warningf("%s event didn't contain pod CIDR", network.NET_PLUGIN_EVENT_POD_CIDR_CHANGE)
return
}
if plugin.netConfig != nil {
glog.Warningf("Ignoring subsequent pod CIDR update to %s", podCIDR)
return
}
glog.V(5).Infof("PodCIDR is set to %q", podCIDR)
_, cidr, err := net.ParseCIDR(podCIDR)
if err == nil {
setHairpin := plugin.hairpinMode == componentconfig.HairpinVeth
// Set bridge address to first address in IPNet
cidr.IP.To4()[3] += 1
json := fmt.Sprintf(NET_CONFIG_TEMPLATE, BridgeName, plugin.mtu, network.DefaultInterfaceName, setHairpin, podCIDR, cidr.IP.String())
glog.V(2).Infof("CNI network config set to %v", json)
plugin.netConfig, err = libcni.ConfFromBytes([]byte(json))
if err == nil {
glog.V(5).Infof("CNI network config:\n%s", json)
// Ensure cbr0 has no conflicting addresses; CNI's 'bridge'
// plugin will bail out if the bridge has an unexpected one
plugin.clearBridgeAddressesExcept(cidr)
}
plugin.podCidr = podCIDR
plugin.gateway = cidr.IP
}
if err != nil {
glog.Warningf("Failed to generate CNI network config: %v", err)
}
}
func getLoNetwork(binDir, vendorDirPrefix string) *cniNetwork {
loConfig, err := libcni.ConfFromBytes([]byte(`{
"cniVersion": "0.1.0",
"name": "cni-loopback",
"type": "loopback"
}`))
if err != nil {
// The hardcoded config above should always be valid and unit tests will
// catch this
panic(err)
}
cninet := &libcni.CNIConfig{
Path: []string{vendorCNIDir(vendorDirPrefix, loConfig.Network.Type), binDir},
}
loNetwork := &cniNetwork{
name: "lo",
NetworkConfig: loConfig,
CNIConfig: cninet,
}
return loNetwork
}