70 lines
2.1 KiB
Go
70 lines
2.1 KiB
Go
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package network
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import (
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"fmt"
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"github.com/dotcloud/docker/pkg/libcontainer"
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"os"
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"syscall"
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)
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// SetupVeth sets up an existing network namespace with the specified
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// network configuration.
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func SetupVeth(config *libcontainer.Network) error {
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if err := InterfaceDown(config.TempVethName); err != nil {
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return fmt.Errorf("interface down %s %s", config.TempVethName, err)
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}
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if err := ChangeInterfaceName(config.TempVethName, "eth0"); err != nil {
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return fmt.Errorf("change %s to eth0 %s", config.TempVethName, err)
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}
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if err := SetInterfaceIp("eth0", config.IP); err != nil {
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return fmt.Errorf("set eth0 ip %s", err)
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}
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if err := SetMtu("eth0", config.Mtu); err != nil {
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return fmt.Errorf("set eth0 mtu to %d %s", config.Mtu, err)
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}
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if err := InterfaceUp("eth0"); err != nil {
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return fmt.Errorf("eth0 up %s", err)
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}
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if err := SetMtu("lo", config.Mtu); err != nil {
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return fmt.Errorf("set lo mtu to %d %s", config.Mtu, err)
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}
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if err := InterfaceUp("lo"); err != nil {
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return fmt.Errorf("lo up %s", err)
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}
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if config.Gateway != "" {
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if err := SetDefaultGateway(config.Gateway); err != nil {
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return fmt.Errorf("set gateway to %s %s", config.Gateway, err)
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}
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}
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return nil
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}
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// SetupNamespaceMountDir prepares a new root for use as a mount
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// source for bind mounting namespace fd to an outside path
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func SetupNamespaceMountDir(root string) error {
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if err := os.MkdirAll(root, 0666); err != nil {
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return err
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}
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// make sure mounts are not unmounted by other mnt namespaces
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if err := syscall.Mount("", root, "none", syscall.MS_SHARED|syscall.MS_REC, ""); err != nil && err != syscall.EINVAL {
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return err
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}
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if err := syscall.Mount(root, root, "none", syscall.MS_BIND, ""); err != nil {
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return err
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}
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return nil
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}
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// DeleteNetworkNamespace unmounts the binding path and removes the
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// file so that no references to the fd are present and the network
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// namespace is automatically cleaned up
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func DeleteNetworkNamespace(bindingPath string) error {
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if err := syscall.Unmount(bindingPath, 0); err != nil {
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return err
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}
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return os.Remove(bindingPath)
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}
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