func (e *podEnv) setupNets(nets []activeNet, noDNS bool) error {
err := os.MkdirAll(e.netDir(), 0755)
if err != nil {
return err
}
i := 0
defer func() {
if err != nil {
e.teardownNets(nets[:i])
}
}()
n := activeNet{}
// did stage0 already make /etc/rkt-resolv.conf (i.e. --dns passed)
resolvPath := filepath.Join(common.Stage1RootfsPath(e.podRoot), "etc/rkt-resolv.conf")
_, err = os.Stat(resolvPath)
if err != nil && !os.IsNotExist(err) {
return errwrap.Wrap(fmt.Errorf("error statting /etc/rkt-resolv.conf"), err)
}
podHasResolvConf := err == nil
for i, n = range nets {
if debuglog {
stderr.Printf("loading network %v with type %v", n.conf.Name, n.conf.Type)
}
n.runtime.IfName = fmt.Sprintf(IfNamePattern, i)
if n.runtime.ConfPath, err = copyFileToDir(n.runtime.ConfPath, e.netDir()); err != nil {
return errwrap.Wrap(fmt.Errorf("error copying %q to %q", n.runtime.ConfPath, e.netDir()), err)
}
// Actually shell out to the plugin
err = e.netPluginAdd(&n, e.podNS.Path())
if err != nil {
return errwrap.Wrap(fmt.Errorf("error adding network %q", n.conf.Name), err)
}
// Generate rkt-resolv.conf if it's not already there.
// The first network plugin that supplies a non-empty
// DNS response will win, unless noDNS is true (--dns passed to rkt run)
if !common.IsDNSZero(&n.runtime.DNS) && !noDNS {
if !podHasResolvConf {
err := ioutil.WriteFile(
resolvPath,
[]byte(common.MakeResolvConf(n.runtime.DNS, "Generated by rkt from network "+n.conf.Name)),
0644)
if err != nil {
return errwrap.Wrap(fmt.Errorf("error creating resolv.conf"), err)
}
podHasResolvConf = true
} else {
stderr.Printf("Warning: network %v plugin specified DNS configuration, but DNS already supplied", n.conf.Name)
}
}
}
return nil
}
// writeResolvConf will generate <stage1>/etc/rkt-resolv.conf if needed
func writeResolvConf(cfg *RunConfig, rootfs string) {
if cfg.DNSConfMode.Resolv != "stage0" {
return
}
if err := os.Mkdir(filepath.Join(rootfs, "etc"), common.DefaultRegularDirPerm); err != nil {
if !os.IsExist(err) {
log.Fatalf("error creating dir %q: %v\n", "/etc", err)
}
}
resolvPath := filepath.Join(rootfs, "etc/rkt-resolv.conf")
f, err := os.Create(resolvPath)
if err != nil {
log.Fatalf("error writing etc/rkt-resolv.conf: %v\n", err)
}
defer f.Close()
_, err = f.WriteString(common.MakeResolvConf(cfg.DNSConfig, "Generated by rkt run"))
if err != nil {
log.Fatalf("error writing etc/rkt-resolv.conf: %v\n", err)
}
}
// 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, noDNS bool) (*Networking, error) {
network := Networking{
podEnv: podEnv{
podRoot: podRoot,
podID: podID,
netsLoadList: netList,
localConfig: localConfig,
},
}
var e error
// If there's a network set as default in CNI configuration
defaultGatewaySet := false
_, defaultNet, err := net.ParseCIDR("0.0.0.0/0")
if err != nil {
return nil, errwrap.Wrap(errors.New("error when parsing net address"), err)
}
network.nets, e = network.loadNets()
if e != nil {
return nil, errwrap.Wrap(errors.New("error loading network definitions"), e)
}
// did stage0 already make /etc/rkt-resolv.conf (i.e. --dns passed)
resolvPath := filepath.Join(common.Stage1RootfsPath(podRoot), "etc/rkt-resolv.conf")
_, err = os.Stat(resolvPath)
if err != nil && !os.IsNotExist(err) {
return nil, errwrap.Wrap(fmt.Errorf("error statting /etc/rkt-resolv.conf"), err)
}
podHasResolvConf := err == nil
for i, n := range network.nets {
if n.conf.Type == "flannel" {
if err := kvmTransformFlannelNetwork(&n); err != nil {
return nil, errwrap.Wrap(errors.New("cannot transform flannel network into basic network"), 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, errwrap.Wrap(fmt.Errorf("cannot add address to host tap device %q", ifName), err)
}
if err := removeAllRoutesOnLink(link); err != nil {
return nil, errwrap.Wrap(fmt.Errorf("cannot remove route on host tap device %q", ifName), err)
}
if err := addRoute(link, n.runtime.IP); err != nil {
return nil, errwrap.Wrap(errors.New("cannot add on host direct route to pod"), err)
}
case "bridge":
config := BridgeNetConf{
NetConf: NetConf{
MTU: defaultMTU,
},
BrName: defaultBrName,
}
if err := json.Unmarshal(n.confBytes, &config); err != nil {
return nil, errwrap.Wrap(fmt.Errorf("error parsing %q result", n.conf.Name), err)
}
br, err := ensureBridgeIsUp(config.BrName, config.MTU)
if err != nil {
return nil, errwrap.Wrap(errors.New("error in time of bridge setup"), err)
}
link, err := setupTapDevice(podID)
if err != nil {
return nil, errwrap.Wrap(errors.New("can not setup tap device"), err)
}
err = netlink.LinkSetMaster(link, br)
if err != nil {
rErr := tuntap.RemovePersistentIface(n.runtime.IfName, tuntap.Tap)
if rErr != nil {
stderr.PrintE("warning: could not cleanup tap interface", rErr)
}
return nil, errwrap.Wrap(errors.New("can not add tap interface to bridge"), err)
}
ifName := link.Attrs().Name
n.runtime.IfName = ifName
err = kvmSetupNetAddressing(&network, n, ifName)
if err != nil {
return nil, err
}
if n.conf.IsDefaultGateway {
n.runtime.IP4.Routes = append(
n.runtime.IP4.Routes,
cnitypes.Route{Dst: *defaultNet, GW: n.runtime.IP4.Gateway},
)
defaultGatewaySet = true
config.IsGw = true
}
if config.IsGw {
err = ensureHasAddr(
br,
&net.IPNet{
IP: n.runtime.IP4.Gateway,
Mask: net.IPMask(n.runtime.Mask),
},
)
if err != nil {
return nil, errwrap.Wrap(fmt.Errorf("cannot add address to host bridge device %q", br.Name), err)
}
}
case "macvlan":
config := MacVTapNetConf{}
if err := json.Unmarshal(n.confBytes, &config); err != nil {
return nil, errwrap.Wrap(fmt.Errorf("error parsing %q result", n.conf.Name), err)
}
link, err := setupMacVTapDevice(podID, config, i)
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)
}
// Check if there's any other network set as default gateway
if defaultGatewaySet {
for _, route := range n.runtime.IP4.Routes {
if (defaultNet.String() == route.Dst.String()) && !n.conf.IsDefaultGateway {
return nil, fmt.Errorf("flannel config enables default gateway and IPAM sets default gateway via %q", n.runtime.IP4.Gateway)
}
}
}
// Generate rkt-resolv.conf if it's not already there.
// The first network plugin that supplies a non-empty
// DNS response will win, unless noDNS is true (--dns passed to rkt run)
if !common.IsDNSZero(&n.runtime.DNS) && !noDNS {
if !podHasResolvConf {
err := ioutil.WriteFile(
resolvPath,
[]byte(common.MakeResolvConf(n.runtime.DNS, "Generated by rkt from network "+n.conf.Name)),
0644)
if err != nil {
return nil, errwrap.Wrap(fmt.Errorf("error creating resolv.conf"), err)
}
podHasResolvConf = true
} else {
stderr.Printf("Warning: network %v plugin specified DNS configuration, but DNS already supplied", n.conf.Name)
}
}
if n.conf.IPMasq {
chain := cniutils.FormatChainName(n.conf.Name, podID.String())
comment := cniutils.FormatComment(n.conf.Name, podID.String())
if err := ip.SetupIPMasq(&net.IPNet{
IP: n.runtime.IP,
Mask: net.IPMask(n.runtime.Mask),
}, chain, comment); err != nil {
return nil, err
}
}
network.nets[i] = n
}
podIP, err := network.GetForwardableNetPodIP()
if err != nil {
return nil, err
}
if err := network.forwardPorts(fps, podIP); err != nil {
return nil, err
}
return &network, nil
}