func (v *veth) create(n *network, nspid int) (err error) {
tmpName, err := v.generateTempPeerName()
if err != nil {
return err
}
n.TempVethPeerName = tmpName
defer func() {
if err != nil {
netlink.NetworkLinkDel(n.HostInterfaceName)
netlink.NetworkLinkDel(n.TempVethPeerName)
}
}()
if n.Bridge == "" {
return fmt.Errorf("bridge is not specified")
}
if err := netlink.NetworkCreateVethPair(n.HostInterfaceName, n.TempVethPeerName, n.TxQueueLen); err != nil {
return err
}
if err := v.attach(&n.Network); err != nil {
return err
}
child, err := net.InterfaceByName(n.TempVethPeerName)
if err != nil {
return err
}
return netlink.NetworkSetNsPid(child, nspid)
}
// NewVethPair creates a pair of veth network links.
//
// It is equivalent of running:
// ip link add name veth${RANDOM STRING} type veth peer name veth${RANDOM STRING}.
// NewVethPair returns Vether which is initialized to a pointer of type VethPair if the
// veth link was successfully created on Linux host. Newly created pair of veth links
// are assigned random names starting with "veth".
// NewVethPair returns error if the veth pair could not be created.
func NewVethPair() (Vether, error) {
ifcName := makeNetInterfaceName("veth")
peerName := makeNetInterfaceName("veth")
if err := netlink.NetworkCreateVethPair(ifcName, peerName, 0); err != nil {
return nil, err
}
newIfc, err := net.InterfaceByName(ifcName)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
peerIfc, err := net.InterfaceByName(peerName)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &VethPair{
Link: Link{
ifc: newIfc,
},
peerIfc: peerIfc,
}, nil
}
// NewVethPairWithOptions creates a pair of veth network links.
//
// It is equivalent of running:
// ip link add name ${first device name} type veth peer name ${second device name}
// NewVethPairWithOptions returns Vether which is initialized to a pointer of type VethPair if the
// veth link was successfully created on the Linux host. It accepts VethOptions which allow you to set
// peer interface name. It returns error if the veth pair could not be created.
func NewVethPairWithOptions(ifcName string, opts VethOptions) (Vether, error) {
peerName := opts.PeerName
txQLen := opts.TxQueueLen
if ok, err := NetInterfaceNameValid(ifcName); !ok {
return nil, err
}
if _, err := net.InterfaceByName(ifcName); err == nil {
return nil, fmt.Errorf("Interface name %s already assigned on the host", ifcName)
}
if peerName != "" {
if ok, err := NetInterfaceNameValid(peerName); !ok {
return nil, err
}
if _, err := net.InterfaceByName(peerName); err == nil {
return nil, fmt.Errorf("Interface name %s already assigned on the host", peerName)
}
} else {
peerName = makeNetInterfaceName("veth")
}
if txQLen < 0 {
return nil, fmt.Errorf("TX queue length must be a positive integer: %d", txQLen)
}
if err := netlink.NetworkCreateVethPair(ifcName, peerName, txQLen); err != nil {
return nil, err
}
newIfc, err := net.InterfaceByName(ifcName)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
peerIfc, err := net.InterfaceByName(peerName)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &VethPair{
Link: Link{
ifc: newIfc,
},
peerIfc: peerIfc,
}, nil
}