// SetupVeth sets up a virtual ethernet link.
// Should be in container netns.
func SetupVeth(contVethName string, mtu int, hostNS *os.File) (hostVeth, contVeth netlink.Link, err error) {
var hostVethName string
hostVethName, contVeth, err = makeVeth(contVethName, mtu)
if err != nil {
return
}
if err = netlink.LinkSetUp(contVeth); err != nil {
err = fmt.Errorf("failed to set %q up: %v", contVethName, err)
return
}
hostVeth, err = netlink.LinkByName(hostVethName)
if err != nil {
err = fmt.Errorf("failed to lookup %q: %v", hostVethName, err)
return
}
if err = netlink.LinkSetUp(hostVeth); err != nil {
err = fmt.Errorf("failed to set %q up: %v", contVethName, err)
return
}
if err = netlink.LinkSetNsFd(hostVeth, int(hostNS.Fd())); err != nil {
err = fmt.Errorf("failed to move veth to host netns: %v", err)
return
}
return
}
// SetupVeth sets up a virtual ethernet link.
// Should be in container netns.
// TODO(eyakubovich): get rid of entropy and ask kernel to pick name via pattern
func SetupVeth(entropy, contVethName string, mtu int, hostNS *os.File) (hostVeth, contVeth netlink.Link, err error) {
// NetworkManager (recent versions) will ignore veth devices that start with "veth"
hostVethName := RandomVethName(entropy)
hostVeth, err = makeVeth(hostVethName, contVethName, mtu)
if err != nil {
err = fmt.Errorf("failed to make veth pair: %v", err)
return
}
if err = netlink.LinkSetUp(hostVeth); err != nil {
err = fmt.Errorf("failed to set %q up: %v", hostVethName, err)
return
}
contVeth, err = netlink.LinkByName(contVethName)
if err != nil {
err = fmt.Errorf("failed to lookup %q: %v", contVethName, err)
return
}
if err = netlink.LinkSetUp(contVeth); err != nil {
err = fmt.Errorf("failed to set %q up: %v", contVethName, err)
return
}
if err = netlink.LinkSetNsFd(hostVeth, int(hostNS.Fd())); err != nil {
err = fmt.Errorf("failed to move veth to host netns: %v", err)
return
}
return
}