// Search the network namespace of a process for interfaces matching a predicate
// Note that the predicate is called while the goroutine is inside the process' netns
func FindNetDevs(processID int, match func(link netlink.Link) bool) ([]NetDev, error) {
var netDevs []NetDev
ns, err := netns.GetFromPid(processID)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
defer ns.Close()
err = weavenet.WithNetNSUnsafe(ns, func() error {
return forEachLink(func(link netlink.Link) error {
if match(link) {
netDev, err := linkToNetDev(link)
if err != nil {
return err
}
netDevs = append(netDevs, netDev)
}
return nil
})
})
return netDevs, err
}
func (c *CNIPlugin) CmdDel(args *skel.CmdArgs) error {
conf, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
ns, err := netns.GetFromPath(args.Netns)
if err != nil {
return err
}
defer ns.Close()
err = weavenet.WithNetNSUnsafe(ns, func() error {
link, err := netlink.LinkByName(args.IfName)
if err != nil {
return err
}
return netlink.LinkDel(link)
})
if err != nil {
return fmt.Errorf("error removing interface: %s", err)
}
// Default IPAM is Weave's own
if conf.IPAM.Type == "" {
err = ipamplugin.NewIpam(c.weave).Release(args)
} else {
err = ipam.ExecDel(conf.IPAM.Type, args.StdinData)
}
if err != nil {
return fmt.Errorf("unable to release IP address: %s", err)
}
return nil
}