func nsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
defer InitOSContext()()
f, err := os.OpenFile(path, os.O_RDONLY, 0)
if err != nil {
return fmt.Errorf("failed get network namespace %q: %v", path, err)
}
defer f.Close()
nsFD := f.Fd()
// Invoked before the namespace switch happens but after the namespace file
// handle is obtained.
if err := prefunc(int(nsFD)); err != nil {
return fmt.Errorf("failed in prefunc: %v", err)
}
if err = netns.Set(netns.NsHandle(nsFD)); err != nil {
return err
}
defer ns.SetNamespace()
// Invoked after the namespace switch.
return postfunc(ns.ParseHandlerInt())
}
func (i *nwIface) Remove() error {
i.Lock()
n := i.ns
i.Unlock()
n.Lock()
isDefault := n.isDefault
nlh := n.nlHandle
n.Unlock()
// Find the network interface identified by the DstName attribute.
iface, err := nlh.LinkByName(i.DstName())
if err != nil {
return err
}
// Down the interface before configuring
if err := nlh.LinkSetDown(iface); err != nil {
return err
}
err = nlh.LinkSetName(iface, i.SrcName())
if err != nil {
logrus.Debugf("LinkSetName failed for interface %s: %v", i.SrcName(), err)
return err
}
// if it is a bridge just delete it.
if i.Bridge() {
if err := nlh.LinkDel(iface); err != nil {
return fmt.Errorf("failed deleting bridge %q: %v", i.SrcName(), err)
}
} else if !isDefault {
// Move the network interface to caller namespace.
if err := nlh.LinkSetNsFd(iface, ns.ParseHandlerInt()); err != nil {
logrus.Debugf("LinkSetNsPid failed for interface %s: %v", i.SrcName(), err)
return err
}
}
n.Lock()
for index, intf := range n.iFaces {
if intf == i {
n.iFaces = append(n.iFaces[:index], n.iFaces[index+1:]...)
break
}
}
n.Unlock()
n.checkLoV6()
return nil
}
func nsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
defer InitOSContext()()
newNs, err := netns.GetFromPath(path)
if err != nil {
return fmt.Errorf("failed get network namespace %q: %v", path, err)
}
defer newNs.Close()
// Invoked before the namespace switch happens but after the namespace file
// handle is obtained.
if err := prefunc(int(newNs)); err != nil {
return fmt.Errorf("failed in prefunc: %v", err)
}
if err = netns.Set(newNs); err != nil {
return err
}
defer ns.SetNamespace()
// Invoked after the namespace switch.
return postfunc(ns.ParseHandlerInt())
}