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// +build linux
package app
import (
"fmt"
"net"
"os/exec"
"regexp"
"strings"
"github.com/sirupsen/logrus"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/vishvananda/netlink"
)
func renameLink(curName, newName string) error {
link, err := netlink.LinkByName(curName)
if err != nil {
return err
}
if err := netlink.LinkSetDown(link); err != nil {
return err
}
if err := netlink.LinkSetName(link, newName); err != nil {
return err
}
if err := netlink.LinkSetUp(link); err != nil {
return err
}
return nil
}
func setupInterface(netns ns.NetNS, containerID, ifName, macAddress, ipAddress, gatewayIP, defaultGateway string, mtu int) (*current.Interface, *current.Interface, error) {
hostIface := ¤t.Interface{}
contIface := ¤t.Interface{}
var oldHostVethName string
err := netns.Do(func(hostNS ns.NetNS) error {
// create the veth pair in the container and move host end into host netns
hostVeth, containerVeth, err := ip.SetupVeth(ifName, mtu, hostNS)
if err != nil {
return fmt.Errorf("failed to setup veth %s: %v", ifName, err)
//return err
}
hostIface.Mac = hostVeth.HardwareAddr.String()
contIface.Name = containerVeth.Name
link, err := netlink.LinkByName(contIface.Name)
if err != nil {
return fmt.Errorf("failed to lookup %s: %v", contIface.Name, err)
}
hwAddr, err := net.ParseMAC(macAddress)
if err != nil {
return fmt.Errorf("failed to parse mac address for %s: %v", contIface.Name, err)
}
err = netlink.LinkSetHardwareAddr(link, hwAddr)
if err != nil {
return fmt.Errorf("failed to add mac address %s to %s: %v", macAddress, contIface.Name, err)
}
contIface.Mac = macAddress
contIface.Sandbox = netns.Path()
addr, err := netlink.ParseAddr(ipAddress)
if err != nil {
return err
}
err = netlink.AddrAdd(link, addr)
if err != nil {
return fmt.Errorf("failed to add IP addr %s to %s: %v", ipAddress, contIface.Name, err)
}
if defaultGateway == "true" {
gw := net.ParseIP(gatewayIP)
if gw == nil {
return fmt.Errorf("parse ip of gateway failed")
}
err = ip.AddRoute(nil, gw, link)
if err != nil {
logrus.Errorf("ip.AddRoute failed %v gw %v link %v", err, gw, link)
return err
}
}
oldHostVethName = hostVeth.Name
return nil
})
if err != nil {
return nil, nil, err
}
// rename the host end of veth pair
re := regexp.MustCompile("(\\d+)\\D*\\z")
index := re.FindAllString(ifName, -1)
hostIface.Name = containerID[:14] + index[0]
if err := renameLink(oldHostVethName, hostIface.Name); err != nil {
return nil, nil, fmt.Errorf("failed to rename %s to %s: %v", oldHostVethName, hostIface.Name, err)
}
return hostIface, contIface, nil
}
// ConfigureInterface sets up the container interface
var ConfigureInterface = func(args *skel.CmdArgs, namespace, podName, macAddress, ipAddress, gatewayIP, interfaceName, defaultGateway string, mtu int) ([]*current.Interface, error) {
netns, err := ns.GetNS(args.Netns)
if err != nil {
return nil, fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
hostIface, contIface, err := setupInterface(netns, args.ContainerID, interfaceName, macAddress, ipAddress, gatewayIP, defaultGateway, mtu)
if err != nil {
return nil, err
}
var ifaceID string
if interfaceName != "" {
ifaceID = fmt.Sprintf("%s_%s_%s", namespace, podName, interfaceName)
} else {
ifaceID = fmt.Sprintf("%s_%s", namespace, podName)
}
ovsArgs := []string{
"add-port", "br-int", hostIface.Name, "--", "set",
"interface", hostIface.Name,
fmt.Sprintf("external_ids:attached_mac=%s", macAddress),
fmt.Sprintf("external_ids:iface-id=%s", ifaceID),
fmt.Sprintf("external_ids:ip_address=%s", ipAddress),
fmt.Sprintf("external_ids:sandbox=%s", args.ContainerID),
}
var out []byte
out, err = exec.Command("ovs-vsctl", ovsArgs...).CombinedOutput()
if err != nil {
return nil, fmt.Errorf("failure in plugging pod interface: %v\n %q", err, string(out))
}
return []*current.Interface{hostIface, contIface}, nil
}
func setupRoute(netns ns.NetNS, dst, gw, dev string) error {
// Add Route to the namespace
err := netns.Do(func(_ ns.NetNS) error {
dstAddr, dstAddrNet, _ := net.ParseCIDR(dst)
ipNet := net.IPNet{IP: dstAddr, Mask: dstAddrNet.Mask}
link, err := netlink.LinkByName(dev)
err = ip.AddRoute(&ipNet, net.ParseIP(gw), link)
if err != nil {
logrus.Errorf("ip.AddRoute failed %v dst %v gw %v", err, dst, gw)
}
return err
})
return err
}
// ConfigureRoute sets up the container routes
var ConfigureRoute = func(args *skel.CmdArgs, dst, gw, dev string) error {
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
err = setupRoute(netns, dst, gw, dev)
return err
}
// PlatformSpecificCleanup deletes the OVS port
func PlatformSpecificCleanup(ifaceName string) (bool, error) {
done := false
ovsArgs := []string{
"del-port", "br-int", ifaceName,
}
out, err := exec.Command("ovs-vsctl", ovsArgs...).CombinedOutput()
if err != nil && !strings.Contains(string(out), "no port named") {
// DEL should be idempotent; don't return an error just log it
logrus.Warningf("failed to delete OVS port %s: %v\n %q", ifaceName, err, string(out))
done = true
}
return done, nil
}
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