func setupVeth(netns string, br *netlink.Bridge, ifName string, mtu int, pr *plugin.Result) error {
var hostVethName string
err := ns.WithNetNSPath(netns, func(hostNS *os.File) error {
// create the veth pair in the container and move host end into host netns
hostVeth, _, err := ip.SetupVeth(netns, ifName, mtu, hostNS)
if err != nil {
return err
}
if err = plugin.ConfigureIface(ifName, pr); err != nil {
return err
}
hostVethName = hostVeth.Attrs().Name
return nil
})
if err != nil {
return err
}
// need to lookup hostVeth again as its index has changed during ns move
hostVeth, err := netlink.LinkByName(hostVethName)
if err != nil {
return fmt.Errorf("failed to lookup %q: %v", hostVethName, err)
}
// connect host veth end to the bridge
if err = netlink.LinkSetMaster(hostVeth, br); err != nil {
return fmt.Errorf("failed to connect %q to bridge %v: %v", hostVethName, br.Attrs().Name, err)
}
return nil
}
// kvmSetup prepare new Networking to be used in kvm environment based on tuntap pair interfaces
// to allow communication with virtual machine created by lkvm tool
func kvmSetup(podRoot string, podID types.UUID, fps []ForwardedPort, netList common.NetList, localConfig string) (*Networking, error) {
network := Networking{
podEnv: podEnv{
podRoot: podRoot,
podID: podID,
netsLoadList: netList,
localConfig: localConfig,
},
}
var e error
network.nets, e = network.loadNets()
if e != nil {
return nil, fmt.Errorf("error loading network definitions: %v", e)
}
for i, n := range network.nets {
if n.conf.Type == "flannel" {
if err := kvmTransformFlannelNetwork(&n); err != nil {
return nil, fmt.Errorf("cannot transform flannel network into basic network: %v", err)
}
}
switch n.conf.Type {
case "ptp":
link, err := setupTapDevice(podID)
if err != nil {
return nil, err
}
ifName := link.Attrs().Name
n.runtime.IfName = ifName
err = kvmSetupNetAddressing(&network, n, ifName)
if err != nil {
return nil, err
}
// add address to host tap device
err = ensureHasAddr(
link,
&net.IPNet{
IP: n.runtime.IP4.Gateway,
Mask: net.IPMask(n.runtime.Mask),
},
)
if err != nil {
return nil, fmt.Errorf("cannot add address to host tap device %q: %v", ifName, err)
}
if err := removeAllRoutesOnLink(link); err != nil {
return nil, fmt.Errorf("cannot remove route on host tap device %q: %v", ifName, err)
}
if err := addRoute(link, n.runtime.IP); err != nil {
return nil, fmt.Errorf("cannot add on host direct route to pod: %v", err)
}
case "bridge":
config := BridgeNetConf{
NetConf: NetConf{
MTU: defaultMTU,
},
BrName: defaultBrName,
}
if err := json.Unmarshal(n.confBytes, &config); err != nil {
return nil, fmt.Errorf("error parsing %q result: %v", n.conf.Name, err)
}
br, err := ensureBridgeIsUp(config.BrName, config.MTU)
if err != nil {
return nil, fmt.Errorf("error in time of bridge setup: %v", err)
}
link, err := setupTapDevice(podID)
if err != nil {
return nil, fmt.Errorf("can not setup tap device: %v", err)
}
err = netlink.LinkSetMaster(link, br)
if err != nil {
rErr := tuntap.RemovePersistentIface(n.runtime.IfName, tuntap.Tap)
if rErr != nil {
log.Printf("Warning: could not cleanup tap interface: %v", rErr)
}
return nil, fmt.Errorf("can not add tap interface to bridge: %v", err)
}
ifName := link.Attrs().Name
n.runtime.IfName = ifName
err = kvmSetupNetAddressing(&network, n, ifName)
if err != nil {
return nil, err
}
if config.IsGw {
err = ensureHasAddr(
br,
&net.IPNet{
IP: n.runtime.IP4.Gateway,
Mask: net.IPMask(n.runtime.Mask),
},
)
if err != nil {
return nil, fmt.Errorf("cannot add address to host bridge device %q: %v", br.Name, err)
}
}
case "macvlan":
config := MacVTapNetConf{}
if err := json.Unmarshal(n.confBytes, &config); err != nil {
return nil, fmt.Errorf("error parsing %q result: %v", n.conf.Name, err)
}
link, err := setupMacVTapDevice(podID, config)
if err != nil {
return nil, err
}
ifName := link.Attrs().Name
n.runtime.IfName = ifName
err = kvmSetupNetAddressing(&network, n, ifName)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("network %q have unsupported type: %q", n.conf.Name, n.conf.Type)
}
if n.conf.IPMasq {
chain := getChainName(podID.String(), n.conf.Name)
if err := ip.SetupIPMasq(&net.IPNet{
IP: n.runtime.IP,
Mask: net.IPMask(n.runtime.Mask),
}, chain); err != nil {
return nil, err
}
}
network.nets[i] = n
}
err := network.forwardPorts(fps, network.GetDefaultIP())
if err != nil {
return nil, err
}
return &network, nil
}