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ovs.go
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ovs.go
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package daemon
import (
"fmt"
"github.com/alauda/kube-ovn/pkg/ovs"
"github.com/alauda/kube-ovn/pkg/util"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/vishvananda/netlink"
"k8s.io/klog"
"net"
"os/exec"
)
func (csh cniServerHandler) configureNic(podName, podNamespace, netns, containerID, mac, ip, gateway, ingress, egress string) error {
var err error
hostNicName, containerNicName := generateNicName(containerID)
// Create a veth pair, put one end to container ,the other to ovs port
// NOTE: DO NOT use ovs internal type interface for container.
// Kubernetes will detect 'eth0' nic in pod, so the nic name in pod must be 'eth0'.
// When renaming internal interface to 'eth0', ovs will delete and recreate this interface.
veth := netlink.Veth{LinkAttrs: netlink.LinkAttrs{Name: hostNicName, MTU: 1400}, PeerName: containerNicName}
defer func() {
// Remove veth link in case any error during creating pod network.
if err != nil {
netlink.LinkDel(&veth)
}
}()
err = netlink.LinkAdd(&veth)
if err != nil {
return fmt.Errorf("failed to crate veth for %s %v", podName, err)
}
// Add veth pair host end to ovs port
output, err := exec.Command(
"ovs-vsctl", "--may-exist", "add-port", "br-int", hostNicName, "--",
"set", "interface", hostNicName, fmt.Sprintf("external_ids:iface-id=%s.%s", podName, podNamespace)).CombinedOutput()
if err != nil {
return fmt.Errorf("add nic to ovs failed %v: %s", err, output)
}
// host and container nic must use same mac address, otherwise ovn will reject these packets by default
macAddr, err := net.ParseMAC(mac)
if err != nil {
return fmt.Errorf("failed to parse mac %s %v", macAddr, err)
}
err = configureHostNic(hostNicName, macAddr)
if err != nil {
return err
}
err = ovs.SetPodBandwidth(podName, podNamespace, ingress, egress)
if err != nil {
return err
}
podNS, err := ns.GetNS(netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
err = configureContainerNic(containerNicName, ip, gateway, macAddr, podNS)
if err != nil {
return err
}
return nil
}
func (csh cniServerHandler) deleteNic(netns, podName, podNamespace, containerID string) error {
hostNicName, _ := generateNicName(containerID)
// Remove ovs port
output, err := exec.Command("ovs-vsctl", "--if-exists", "--with-iface", "del-port", "br-int", hostNicName).CombinedOutput()
if err != nil {
return fmt.Errorf("failed to delete ovs port %v, %s", err, output)
}
err = ovs.ClearPodBandwidth(podName, podNamespace)
if err != nil {
return err
}
hostLink, err := netlink.LinkByName(hostNicName)
if err != nil {
// If link already not exists, return quietly
if _, ok := err.(netlink.LinkNotFoundError); ok {
return nil
}
return fmt.Errorf("find host link %s failed %v", hostNicName, err)
}
err = netlink.LinkDel(hostLink)
if err != nil {
return fmt.Errorf("delete host link %s failed %v", hostLink, err)
}
return nil
}
func generateNicName(containerID string) (string, string) {
return fmt.Sprintf("%s_h", containerID[0:12]), fmt.Sprintf("%s_c", containerID[0:12])
}
func configureHostNic(nicName string, macAddr net.HardwareAddr) error {
hostLink, err := netlink.LinkByName(nicName)
if err != nil {
return fmt.Errorf("can not find host nic %s %v", nicName, err)
}
err = netlink.LinkSetHardwareAddr(hostLink, macAddr)
if err != nil {
return fmt.Errorf("can not set mac address to host nic %s %v", nicName, err)
}
err = netlink.LinkSetUp(hostLink)
if err != nil {
return fmt.Errorf("can not set host nic %s up %v", nicName, err)
}
return nil
}
func configureContainerNic(nicName, ipAddr, gateway string, macAddr net.HardwareAddr, netns ns.NetNS) error {
containerLink, err := netlink.LinkByName(nicName)
if err != nil {
return fmt.Errorf("can not find container nic %s %v", nicName, err)
}
err = netlink.LinkSetNsFd(containerLink, int(netns.Fd()))
if err != nil {
return fmt.Errorf("failed to link netns %v", err)
}
// TODO: use github.com/containernetworking/plugins/pkg/ipam.ConfigureIface to refactor this logical
return ns.WithNetNSPath(netns.Path(), func(_ ns.NetNS) error {
// Container nic name MUST be 'eth0', otherwise kubelet will recreate the pod
err = netlink.LinkSetName(containerLink, "eth0")
if err != nil {
return err
}
addr, err := netlink.ParseAddr(ipAddr)
if err != nil {
return fmt.Errorf("can not parse %s %v", ipAddr, err)
}
err = netlink.AddrAdd(containerLink, addr)
if err != nil {
return fmt.Errorf("can not add address to container nic %v", err)
}
err = netlink.LinkSetHardwareAddr(containerLink, macAddr)
if err != nil {
return fmt.Errorf("can not set mac address to container nic %v", err)
}
err = netlink.LinkSetUp(containerLink)
if err != nil {
return fmt.Errorf("can not set container nic %s up %v", nicName, err)
}
_, defaultNet, _ := net.ParseCIDR("0.0.0.0/0")
err = netlink.RouteAdd(&netlink.Route{
LinkIndex: containerLink.Attrs().Index,
Scope: netlink.SCOPE_UNIVERSE,
Dst: defaultNet,
Gw: net.ParseIP(gateway),
})
if err != nil {
return fmt.Errorf("config gateway failed %v", err)
}
return nil
})
}
func configureNodeNic(portName, ip, mac, gw string) error {
macAddr, err := net.ParseMAC(mac)
if err != nil {
return fmt.Errorf("failed to parse mac %s %v", macAddr, err)
}
raw, err := exec.Command(
"ovs-vsctl", "--may-exist", "add-port", "br-int", util.NodeNic, "--",
"set", "interface", util.NodeNic, "type=internal", "--",
"set", "interface", util.NodeNic, fmt.Sprintf("external_ids:iface-id=%s", portName)).CombinedOutput()
if err != nil {
klog.Errorf("failed to configure node nic %s %s", portName, string(raw))
return fmt.Errorf(string(raw))
}
nodeLink, err := netlink.LinkByName(util.NodeNic)
if err != nil {
return fmt.Errorf("can not find node nic %s %v", portName, err)
}
ipAddr, err := netlink.ParseAddr(ip)
if err != nil {
return fmt.Errorf("can not parse %s %v", ip, err)
}
err = netlink.AddrReplace(nodeLink, ipAddr)
if err != nil {
return fmt.Errorf("can not add address to node nic %v", err)
}
err = netlink.LinkSetHardwareAddr(nodeLink, macAddr)
if err != nil {
return fmt.Errorf("can not set mac address to node nic %v", err)
}
err = netlink.LinkSetMTU(nodeLink, 1400)
if err != nil {
return fmt.Errorf("can not set mtu %v", err)
}
if nodeLink.Attrs().OperState != netlink.OperUp {
err = netlink.LinkSetUp(nodeLink)
if err != nil {
return fmt.Errorf("can not set node nic %s up %v", portName, err)
}
}
// ping gw to activate the flow
output, _ := exec.Command("ping", "-w", "10", gw).CombinedOutput()
klog.Infof("ping gw result is: \n %s", string(output))
return nil
}