func cmdAdd(args *skel.CmdArgs) error {
n, err := loadConf(args.StdinData)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
if err = createMacvlan(n, args.IfName, netns); err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
err = netns.Do(func(_ ns.NetNS) error {
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
return err
}
result.DNS = n.DNS
return result.Print()
}
func (e *podEnv) podNSLoad() (ns.NetNS, error) {
podNSPath, err := e.podNSPathLoad()
if err != nil && !podNSerrorOK(podNSPath, err) {
return nil, err
} else {
podNS, err := ns.GetNS(podNSPath)
if err != nil && !podNSerrorOK(podNSPath, err) {
return nil, err
}
return podNS, nil
}
}
// Adds a macvlan interface to a container for use with the egress router feature
func addMacvlan(netns string) error {
var defIface netlink.Link
var err error
// Find interface with the default route
routes, err := netlink.RouteList(nil, netlink.FAMILY_V4)
if err != nil {
return fmt.Errorf("failed to read routes: %v", err)
}
for _, r := range routes {
if r.Dst == nil {
defIface, err = netlink.LinkByIndex(r.LinkIndex)
if err != nil {
return fmt.Errorf("failed to get default route interface: %v", err)
}
}
}
if defIface == nil {
return fmt.Errorf("failed to find default route interface")
}
podNs, err := ns.GetNS(netns)
if err != nil {
return fmt.Errorf("could not open netns %q", netns)
}
defer podNs.Close()
err = netlink.LinkAdd(&netlink.Macvlan{
LinkAttrs: netlink.LinkAttrs{
MTU: defIface.Attrs().MTU,
Name: "macvlan0",
ParentIndex: defIface.Attrs().Index,
Namespace: netlink.NsFd(podNs.Fd()),
},
Mode: netlink.MACVLAN_MODE_PRIVATE,
})
if err != nil {
return fmt.Errorf("failed to create macvlan interface: %v", err)
}
return podNs.Do(func(netns ns.NetNS) error {
l, err := netlink.LinkByName("macvlan0")
if err != nil {
return fmt.Errorf("failed to find macvlan interface: %v", err)
}
err = netlink.LinkSetUp(l)
if err != nil {
return fmt.Errorf("failed to set macvlan interface up: %v", err)
}
return nil
})
}
func (e *podEnv) podNSLoad() error {
podNSPath, err := e.podNSPathLoad()
if err != nil && !podNSerrorOK(podNSPath, err) {
return err
} else {
podNS, err := ns.GetNS(podNSPath)
if err != nil && !podNSerrorOK(podNSPath, err) {
return err
}
e.podNS = podNS
return nil
}
}
// For a given container, returns host veth name, container veth MAC, and pod IP
func getVethInfo(netns, containerIfname string) (string, string, string, error) {
var (
peerIfindex int
contVeth netlink.Link
err error
podIP string
)
containerNs, err := ns.GetNS(netns)
if err != nil {
return "", "", "", fmt.Errorf("failed to get container netns: %v", err)
}
defer containerNs.Close()
err = containerNs.Do(func(ns.NetNS) error {
contVeth, err = netlink.LinkByName(containerIfname)
if err != nil {
return err
}
peerIfindex = contVeth.Attrs().ParentIndex
addrs, err := netlink.AddrList(contVeth, syscall.AF_INET)
if err != nil {
return fmt.Errorf("failed to get container IP addresses: %v", err)
}
if len(addrs) == 0 {
return fmt.Errorf("container had no addresses")
}
podIP = addrs[0].IP.String()
return nil
})
if err != nil {
return "", "", "", fmt.Errorf("failed to inspect container interface: %v", err)
}
hostVeth, err := netlink.LinkByIndex(peerIfindex)
if err != nil {
return "", "", "", fmt.Errorf("failed to get host veth: %v", err)
}
return hostVeth.Attrs().Name, contVeth.Attrs().HardwareAddr.String(), podIP, nil
}
func ReleaseVF(conf *NetConf) error {
netns, err := ns.GetNS(conf.NetNs)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
initns, err := ns.GetCurrentNS()
if err != nil {
return fmt.Errorf("failed to open init ns: %v", err)
}
defer initns.Close()
err = netns.Do(func(_ ns.NetNS) error {
return releaseVF(conf, conf.IfName, initns)
})
return nil
}
func SetupVF(conf *NetConf) error {
netns, err := ns.GetNS(conf.NetNs)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
if err = setupVF(conf, conf.IfName, netns); err != nil {
return err
}
err = netns.Do(func(_ ns.NetNS) error {
return configureIface(conf)
})
if err != nil {
return err
}
return nil
}
for _, netnsPath := range allNetNSInCurrentProcess() {
netnsInode, err := getInode(netnsPath)
Expect(err).NotTo(HaveOccurred())
Expect(netnsInode).NotTo(Equal(createdNetNSInode))
}
})
It("fails when the path is not a namespace", func() {
tempFile, err := ioutil.TempFile("", "nstest")
Expect(err).NotTo(HaveOccurred())
defer tempFile.Close()
nspath := tempFile.Name()
defer os.Remove(nspath)
_, err = ns.GetNS(nspath)
Expect(err).To(HaveOccurred())
Expect(err).To(BeAssignableToTypeOf(ns.NSPathNotNSErr{}))
Expect(err).NotTo(BeAssignableToTypeOf(ns.NSPathNotExistErr{}))
})
})
Describe("closing a network namespace", func() {
It("should prevent further operations", func() {
createdNetNS, err := ns.NewNS()
Expect(err).NotTo(HaveOccurred())
err = createdNetNS.Close()
Expect(err).NotTo(HaveOccurred())
err = createdNetNS.Do(func(ns.NetNS) error { return nil })
func cmdAdd(args *skel.CmdArgs) error {
n, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
if n.IsDefaultGW {
n.IsGW = true
}
br, err := setupBridge(n)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
if err = setupVeth(netns, br, args.IfName, n.MTU, n.HairpinMode); err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
// TODO: make this optional when IPv6 is supported
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
if result.IP4.Gateway == nil && n.IsGW {
result.IP4.Gateway = calcGatewayIP(&result.IP4.IP)
}
if err := netns.Do(func(_ ns.NetNS) error {
// set the default gateway if requested
if n.IsDefaultGW {
_, defaultNet, err := net.ParseCIDR("0.0.0.0/0")
if err != nil {
return err
}
for _, route := range result.IP4.Routes {
if defaultNet.String() == route.Dst.String() {
if route.GW != nil && !route.GW.Equal(result.IP4.Gateway) {
return fmt.Errorf(
"isDefaultGateway ineffective because IPAM sets default route via %q",
route.GW,
)
}
}
}
result.IP4.Routes = append(
result.IP4.Routes,
types.Route{Dst: *defaultNet, GW: result.IP4.Gateway},
)
// TODO: IPV6
}
if err := ipam.ConfigureIface(args.IfName, result); err != nil {
return err
}
if err := ip.SetHWAddrByIP(args.IfName, result.IP4.IP.IP, nil /* TODO IPv6 */); err != nil {
return err
}
return nil
}); err != nil {
return err
}
if n.IsGW {
gwn := &net.IPNet{
IP: result.IP4.Gateway,
Mask: result.IP4.IP.Mask,
}
if err = ensureBridgeAddr(br, gwn, n.ForceAddress); err != nil {
return err
}
if err := ip.SetHWAddrByIP(n.BrName, gwn.IP, nil /* TODO IPv6 */); err != nil {
return err
}
if err := ip.EnableIP4Forward(); err != nil {
return fmt.Errorf("failed to enable forwarding: %v", err)
}
}
if n.IPMasq {
chain := utils.FormatChainName(n.Name, args.ContainerID)
comment := utils.FormatComment(n.Name, args.ContainerID)
if err = ip.SetupIPMasq(ip.Network(&result.IP4.IP), chain, comment); err != nil {
return err
}
}
result.DNS = n.DNS
return result.Print()
}
Protocol: syscall.RTPROT_BOOT,
Table: syscall.RT_TABLE_MAIN,
Type: syscall.RTN_UNICAST,
})))
session, err = DeleteContainer(netconf, netnspath, "")
Expect(err).ShouldNot(HaveOccurred())
Eventually(session).Should(gexec.Exit())
// Make sure there are no endpoints anymore
endpoints, err = calicoClient.WorkloadEndpoints().List(api.WorkloadEndpointMetadata{})
Expect(err).ShouldNot(HaveOccurred())
Expect(endpoints.Items).Should(HaveLen(0))
// Make sure the interface has been removed from the namespace
targetNs, _ := ns.GetNS(netnspath)
err = targetNs.Do(func(_ ns.NetNS) error {
_, err = netlink.LinkByName("eth0")
return err
})
Expect(err).Should(HaveOccurred())
Expect(err.Error()).Should(Equal("Link not found"))
// Make sure the interface has been removed from the host
_, err = netlink.LinkByName("cali" + containerID)
Expect(err).Should(HaveOccurred())
Expect(err.Error()).Should(Equal("Link not found"))
})
})
})
func cmdAdd(args *skel.CmdArgs) error {
n, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
log.Debugf("Args %s", args)
c, err := cnc.NewDefaultClient()
if err != nil {
return fmt.Errorf("error while starting cilium-client: %s", err)
}
netNs, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %s", args.Netns, err)
}
defer netNs.Close()
if err := removeIfFromNSIfExists(netNs, args.IfName); err != nil {
return fmt.Errorf("failed removing interface %q from namespace %q: %s",
args.IfName, args.Netns, err)
}
var ep endpoint.Endpoint
veth, peer, tmpIfName, err := plugins.SetupVeth(args.ContainerID, n.MTU, &ep)
if err != nil {
return err
}
defer func() {
if err != nil {
if err = netlink.LinkDel(veth); err != nil {
log.Warningf("failed to clean up veth %q: %s", veth.Name, err)
}
}
}()
if err = netlink.LinkSetNsFd(*peer, int(netNs.Fd())); err != nil {
return fmt.Errorf("unable to move veth pair %q to netns: %s", peer, err)
}
err = netNs.Do(func(_ ns.NetNS) error {
err := renameLink(tmpIfName, args.IfName)
if err != nil {
return fmt.Errorf("failed to rename %q to %q: %s", tmpIfName, args.IfName, err)
}
return nil
})
req := ipam.IPAMReq{}
ipamConf, err := c.AllocateIP(ipam.CNIIPAMType, req)
if err != nil {
return err
}
defer func() {
if err != nil && ipamConf != nil {
if ipamConf.IP6 != nil {
req := ipam.IPAMReq{IP: &ipamConf.IP6.IP.IP}
if err = c.ReleaseIP(ipam.CNIIPAMType, req); err != nil {
log.Warningf("failed to release allocated IPv6 of container ID %q: %s", args.ContainerID, err)
}
}
if ipamConf.IP4 != nil {
req := ipam.IPAMReq{IP: &ipamConf.IP4.IP.IP}
if err = c.ReleaseIP(ipam.CNIIPAMType, req); err != nil {
log.Warningf("failed to release allocated IPv4 of container ID %q: %s", args.ContainerID, err)
}
}
}
}()
if err = netNs.Do(func(_ ns.NetNS) error {
return configureIface(args.IfName, ipamConf)
}); err != nil {
return err
}
ep.IPv6 = addressing.DeriveCiliumIPv6(ipamConf.IP6.IP.IP)
if ipamConf.IP4 != nil {
ep.IPv4 = addressing.DeriveCiliumIPv4(ipamConf.IP4.IP.IP)
}
ep.NodeIP = ipamConf.IP6.Gateway
ep.DockerID = args.ContainerID
ep.SetID()
if err = c.EndpointJoin(ep); err != nil {
return fmt.Errorf("unable to create eBPF map: %s", err)
}
return createCNIReply(ipamConf)
}
