You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
subgraph-oz/network/ozinit.go

104 lines
2.5 KiB

package network
import (
//Builtin
"errors"
"fmt"
"os"
// Internal
//"github.com/op/go-logging"
//External
"github.com/milosgajdos83/tenus"
)
// Setup the networking inside the child
// Namely setup the loopback interface
// and the veth interface if requested
func NetSetup(stn *SandboxNetwork) error {
if os.Getpid() != 1 {
panic(errors.New("Cannot use NetSetup from parent."))
}
if err := setupLoopback(stn); err != nil {
return fmt.Errorf("Unable to setup loopback interface: %+v", err)
}
// If required configure veth
if stn.VethGuest != "" {
if err := setupVEth(stn); err != nil {
return fmt.Errorf("Unable to setup veth interface: %+v", err)
}
}
return nil
}
func (stn *SandboxNetwork) NetReconfigure() error {
if os.Getpid() != 1 {
panic(errors.New("Cannot use NetReconfigure from parent."))
}
// Set the link's default gateway
if err := stn.Interface.SetLinkDefaultGw(&stn.Gateway); err != nil {
return fmt.Errorf("Unable to set default route %s.", err)
}
return nil
}
func setupLoopback(stn *SandboxNetwork) error {
// Bring loopback interface up
lo, err := tenus.NewLinkFrom("lo")
if err != nil {
return fmt.Errorf("Unable to fetch loopback interface, %s.", err)
}
// Bring the link up
err = lo.SetLinkUp()
if err != nil {
return fmt.Errorf("Unable to bring loopback interface up, %s.", err)
}
return nil
}
func setupVEth(stn *SandboxNetwork) error {
ifc, err := tenus.NewLinkFrom(stn.VethGuest)
if err != nil {
return fmt.Errorf("Unable to fetch inteface %s, %s.", stn.VethGuest, err)
}
// Bring the link down to prepare for renaming
if err = ifc.SetLinkDown(); err != nil {
return fmt.Errorf("Unable to bring interface %s down, %s.", stn.VethGuest, err)
}
// Rename the interface to a standard eth0 (not really a necessity)
if err = tenus.RenameInterface(stn.VethGuest, ozDefaultInterfaceInternal); err != nil {
return fmt.Errorf("Unable to rename interface %s, %s.", stn.VethGuest, err)
}
// Refetch the interface again as it has changed
ifc, err = tenus.NewLinkFrom(ozDefaultInterfaceInternal)
if err != nil {
return fmt.Errorf("Unable to fetch interface %s, %s.", ozDefaultInterfaceInternal, err)
}
// Bring the link back up
if err = ifc.SetLinkUp(); err != nil {
return fmt.Errorf("Unable to bring interface %s up, %s.", ozDefaultInterfaceInternal, err)
}
// Set the link's default gateway
if err = ifc.SetLinkDefaultGw(&stn.Gateway); err != nil {
return fmt.Errorf("Unable to set default route %s.", err)
}
stn.Interface = ifc
return nil
}