func (v *veth) initialize(config *network) error {
peer := config.TempVethPeerName
if peer == "" {
return fmt.Errorf("peer is not specified")
}
child, err := net.InterfaceByName(peer)
if err != nil {
return err
}
if err := netlink.NetworkLinkDown(child); err != nil {
return err
}
if err := netlink.NetworkChangeName(child, config.Name); err != nil {
return err
}
// get the interface again after we changed the name as the index also changes.
if child, err = net.InterfaceByName(config.Name); err != nil {
return err
}
if config.MacAddress != "" {
if err := netlink.NetworkSetMacAddress(child, config.MacAddress); err != nil {
return err
}
}
ip, ipNet, err := net.ParseCIDR(config.Address)
if err != nil {
return err
}
if err := netlink.NetworkLinkAddIp(child, ip, ipNet); err != nil {
return err
}
if config.IPv6Address != "" {
if ip, ipNet, err = net.ParseCIDR(config.IPv6Address); err != nil {
return err
}
if err := netlink.NetworkLinkAddIp(child, ip, ipNet); err != nil {
return err
}
}
if err := netlink.NetworkSetMTU(child, config.Mtu); err != nil {
return err
}
if err := netlink.NetworkLinkUp(child); err != nil {
return err
}
if config.Gateway != "" {
if err := netlink.AddDefaultGw(config.Gateway, config.Name); err != nil {
return err
}
}
if config.IPv6Gateway != "" {
if err := netlink.AddDefaultGw(config.IPv6Gateway, config.Name); err != nil {
return err
}
}
return nil
}
// SetPeerLinkNetInNs configures peer link's IP network in network namespace specified by PID
func (veth *VethPair) SetPeerLinkNetInNs(nspid int, ip net.IP, network *net.IPNet, gw *net.IP) error {
origNs, _ := NetNsHandle(os.Getpid())
defer syscall.Close(int(origNs))
defer system.Setns(origNs, syscall.CLONE_NEWNET)
if err := SetNetNsToPid(nspid); err != nil {
return fmt.Errorf("Setting network namespace failed: %s", err)
}
if err := netlink.NetworkLinkAddIp(veth.peerIfc, ip, network); err != nil {
return fmt.Errorf("Unable to set IP: %s in pid: %d network namespace", ip.String(), nspid)
}
if err := netlink.NetworkLinkUp(veth.peerIfc); err != nil {
return fmt.Errorf("Unable to bring %s interface UP: %s", veth.peerIfc.Name, nspid)
}
if gw != nil {
if err := netlink.AddDefaultGw(gw.String(), veth.peerIfc.Name); err != nil {
return fmt.Errorf("Unable to set Default gateway: %s in pid: %d network namespace", gw.String(), nspid)
}
}
return nil
}
func main() {
log.SetFlags(log.Lshortfile)
iface, err := net.InterfaceByName("eth0")
if err != nil {
log.Fatal(err)
}
ip, ipNet, _ := net.ParseCIDR("192.168.122.128/24")
if err := netlink.NetworkLinkAddIp(iface, ip, ipNet); err != nil {
log.Fatal(err)
}
if err := netlink.AddDefaultGw("192.168.122.1", "eth0"); err != nil {
log.Fatal(err)
}
if err := netlink.NetworkLinkUp(iface); err != nil {
log.Fatal(err)
}
start := time.Now()
arping.SetTimeout(100 * time.Millisecond)
for {
addr, t, err := arping.PingOverIface(net.ParseIP("192.168.122.1"), *iface)
if err != nil {
log.Println("ARP error:", err)
continue
}
log.Printf("ARP success after %s: %v %v", time.Now().Sub(start), addr, t)
return
}
}
// Setup networking
func setupNetworking(args *InitArgs) error {
if args.Ip != "" {
// eth0
iface, err := net.InterfaceByName("eth0")
if err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
ip, ipNet, err := net.ParseCIDR(args.Ip)
if err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
if err := netlink.NetworkLinkAddIp(iface, ip, ipNet); err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
if err := netlink.NetworkSetMTU(iface, args.Mtu); err != nil {
return fmt.Errorf("Unable to set MTU: %v", err)
}
if err := netlink.NetworkLinkUp(iface); err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
// loopback
iface, err = net.InterfaceByName("lo")
if err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
if err := netlink.NetworkLinkUp(iface); err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
}
if args.Gateway != "" {
gw := net.ParseIP(args.Gateway)
if gw == nil {
return fmt.Errorf("Unable to set up networking, %s is not a valid gateway IP", args.Gateway)
}
if err := netlink.AddDefaultGw(gw.String(), "eth0"); err != nil {
return fmt.Errorf("Unable to set up networking: %v", err)
}
}
return nil
}
func SetDefaultGateway(ip, ifaceName string) error {
return netlink.AddDefaultGw(ip, ifaceName)
}
func SetDefaultGateway(ip string) error {
return netlink.AddDefaultGw(net.ParseIP(ip))
}
func (Link) AddDefaultGW(intf *net.Interface, ip net.IP) error {
netlinkMu.Lock()
defer netlinkMu.Unlock()
return errF(netlink.AddDefaultGw(ip.String(), intf.Name))
}
// SetLinkDefaultGw configures the link's default Gateway.
// It is equivalent of running: ip route add default via ${ip address}
func (l *Link) SetLinkDefaultGw(gw *net.IP) error {
return netlink.AddDefaultGw(gw.String(), l.NetInterface().Name)
}