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package network
import (
"fmt"
"github.com/dotcloud/docker/pkg/libcontainer"
"github.com/dotcloud/docker/pkg/libcontainer/utils"
)
// Veth is a network strategy that uses a bridge and creates
// a veth pair, one that stays outside on the host and the other
// is placed inside the container's namespace
type Veth struct {
}
func (v *Veth) Create(n *libcontainer.Network, nspid int, context libcontainer.Context) error {
var (
bridge string
prefix string
exists bool
)
if bridge, exists = n.Context["bridge"]; !exists {
return fmt.Errorf("bridge does not exist in network context")
}
if prefix, exists = n.Context["prefix"]; !exists {
return fmt.Errorf("veth prefix does not exist in network context")
}
name1, name2, err := createVethPair(prefix)
if err != nil {
return err
}
context["veth-host"] = name1
context["veth-child"] = name2
if err := SetInterfaceMaster(name1, bridge); err != nil {
return err
}
if err := SetMtu(name1, n.Mtu); err != nil {
return err
}
if err := InterfaceUp(name1); err != nil {
return err
}
if err := SetInterfaceInNamespacePid(name2, nspid); err != nil {
return err
}
return nil
}
func (v *Veth) Initialize(config *libcontainer.Network, context libcontainer.Context) error {
var (
vethChild string
exists bool
)
if vethChild, exists = context["veth-child"]; !exists {
return fmt.Errorf("vethChild does not exist in network context")
}
if err := InterfaceDown(vethChild); err != nil {
return fmt.Errorf("interface down %s %s", vethChild, err)
}
if err := ChangeInterfaceName(vethChild, "eth0"); err != nil {
return fmt.Errorf("change %s to eth0 %s", vethChild, err)
}
if err := SetInterfaceIp("eth0", config.Address); err != nil {
return fmt.Errorf("set eth0 ip %s", err)
}
if err := SetMtu("eth0", config.Mtu); err != nil {
return fmt.Errorf("set eth0 mtu to %d %s", config.Mtu, err)
}
if err := InterfaceUp("eth0"); err != nil {
return fmt.Errorf("eth0 up %s", err)
}
if config.Gateway != "" {
if err := SetDefaultGateway(config.Gateway); err != nil {
return fmt.Errorf("set gateway to %s %s", config.Gateway, err)
}
}
return nil
}
// createVethPair will automatically generage two random names for
// the veth pair and ensure that they have been created
func createVethPair(prefix string) (name1 string, name2 string, err error) {
name1, err = utils.GenerateRandomName(prefix, 4)
if err != nil {
return
}
name2, err = utils.GenerateRandomName(prefix, 4)
if err != nil {
return
}
if err = CreateVethPair(name1, name2); err != nil {
return
}
return
}
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