123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
// +build linux
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package network
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import (
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"fmt"
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"github.com/docker/libcontainer/netlink"
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"github.com/docker/libcontainer/utils"
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)
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// Veth is a network strategy that uses a bridge and creates
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// a veth pair, one that stays outside on the host and the other
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// is placed inside the container's namespace
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type Veth struct {
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}
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const defaultDevice = "eth0"
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func (v *Veth) Create(n *Network, nspid int, networkState *NetworkState) error {
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var (
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bridge = n.Bridge
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prefix = n.VethPrefix
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txQueueLen = n.TxQueueLen
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)
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if bridge == "" {
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return fmt.Errorf("bridge is not specified")
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}
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if prefix == "" {
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return fmt.Errorf("veth prefix is not specified")
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}
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name1, name2, err := createVethPair(prefix, txQueueLen)
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if err != nil {
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return err
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}
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if err := SetInterfaceMaster(name1, bridge); err != nil {
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return err
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}
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if err := SetMtu(name1, n.Mtu); err != nil {
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return err
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}
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if err := InterfaceUp(name1); err != nil {
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return err
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}
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if err := SetInterfaceInNamespacePid(name2, nspid); err != nil {
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return err
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}
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networkState.VethHost = name1
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networkState.VethChild = name2
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return nil
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}
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func (v *Veth) Initialize(config *Network, networkState *NetworkState) error {
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var vethChild = networkState.VethChild
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if vethChild == "" {
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return fmt.Errorf("vethChild is not specified")
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}
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if err := InterfaceDown(vethChild); err != nil {
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return fmt.Errorf("interface down %s %s", vethChild, err)
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}
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if err := ChangeInterfaceName(vethChild, defaultDevice); err != nil {
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return fmt.Errorf("change %s to %s %s", vethChild, defaultDevice, err)
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}
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if config.MacAddress != "" {
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if err := SetInterfaceMac(defaultDevice, config.MacAddress); err != nil {
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return fmt.Errorf("set %s mac %s", defaultDevice, err)
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}
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}
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if err := SetInterfaceIp(defaultDevice, config.Address); err != nil {
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return fmt.Errorf("set %s ip %s", defaultDevice, err)
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}
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if config.IPv6Address != "" {
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if err := SetInterfaceIp(defaultDevice, config.IPv6Address); err != nil {
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return fmt.Errorf("set %s ipv6 %s", defaultDevice, err)
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}
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}
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if err := SetMtu(defaultDevice, config.Mtu); err != nil {
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return fmt.Errorf("set %s mtu to %d %s", defaultDevice, config.Mtu, err)
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}
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if err := InterfaceUp(defaultDevice); err != nil {
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return fmt.Errorf("%s up %s", defaultDevice, err)
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}
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if config.Gateway != "" {
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if err := SetDefaultGateway(config.Gateway, defaultDevice); err != nil {
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return fmt.Errorf("set gateway to %s on device %s failed with %s", config.Gateway, defaultDevice, err)
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}
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}
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if config.IPv6Gateway != "" {
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if err := SetDefaultGateway(config.IPv6Gateway, defaultDevice); err != nil {
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return fmt.Errorf("set gateway for ipv6 to %s on device %s failed with %s", config.IPv6Gateway, defaultDevice, err)
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}
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}
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return nil
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}
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// createVethPair will automatically generage two random names for
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// the veth pair and ensure that they have been created
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func createVethPair(prefix string, txQueueLen int) (name1 string, name2 string, err error) {
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for i := 0; i < 10; i++ {
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if name1, err = utils.GenerateRandomName(prefix, 7); err != nil {
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return
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}
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if name2, err = utils.GenerateRandomName(prefix, 7); err != nil {
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return
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}
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if err = CreateVethPair(name1, name2, txQueueLen); err != nil {
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if err == netlink.ErrInterfaceExists {
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continue
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}
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return
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}
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break
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}
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return
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}
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