// NewMacVlanLink creates macvlan network link
//
// It is equivalent of running:
// ip link add name mc${RANDOM STRING} link ${master interface} type macvlan mode ${mode}
// NewMacVlanLink returns MacVlaner which is initialized to a pointer of type MacVlanLink if the
// macvlan link was created successfully on the Linux host. Newly created link is assigned
// a random name starting with "mc". It sets the macvlan mode the parameter passed as argument.
// If incorrect network mode is passed as a paramter, it sets the macvlan mode to "bridge".
// It returns error if the link could not be created.
func NewMacVlanLink(masterDev string, mode string) (MacVlaner, error) {
macVlanDev := makeNetInterfaceName("mc")
if ok, err := NetInterfaceNameValid(masterDev); !ok {
return nil, err
}
if _, err := net.InterfaceByName(masterDev); err != nil {
return nil, fmt.Errorf("Master MAC VLAN device %s does not exist on the host", masterDev)
}
if mode != "" {
if _, ok := MacVlanModes[mode]; !ok {
return nil, fmt.Errorf("Unsupported MacVlan mode specified: %s", mode)
}
} else {
mode = "bridge"
}
if err := netlink.NetworkLinkAddMacVlan(masterDev, macVlanDev, mode); err != nil {
return nil, err
}
macVlanIfc, err := net.InterfaceByName(macVlanDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
masterIfc, err := net.InterfaceByName(masterDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &MacVlanLink{
Link: Link{
ifc: macVlanIfc,
},
masterIfc: masterIfc,
mode: mode,
}, nil
}
// NewMacVlanLinkWithOptions creates macvlan network link and sets som of its network parameters
// passed in as MacVlanOptions.
//
// It is equivalent of running:
// ip link add name ${macvlan name} link ${master interface} address ${macaddress} type macvlan mode ${mode}
// NewMacVlanLinkWithOptions returns MacVlaner which is initialized to a pointer of type MacVlanLink if the
// macvlan link was created successfully on the Linux host. It returns error if the macvlan link could not be created.
func NewMacVlanLinkWithOptions(masterDev string, opts MacVlanOptions) (MacVlaner, error) {
macVlanDev := opts.MacVlanDev
mode := opts.Mode
macaddr := opts.MacAddr
if ok, err := NetInterfaceNameValid(masterDev); !ok {
return nil, err
}
if _, err := net.InterfaceByName(masterDev); err != nil {
return nil, fmt.Errorf("Master MAC VLAN device %s does not exist on the host", masterDev)
}
if macVlanDev != "" {
if ok, err := NetInterfaceNameValid(macVlanDev); !ok {
return nil, err
}
if _, err := net.InterfaceByName(macVlanDev); err == nil {
return nil, fmt.Errorf("MAC VLAN device %s already assigned on the host", macVlanDev)
}
} else {
macVlanDev = makeNetInterfaceName("mc")
}
if mode != "" {
if _, ok := MacVlanModes[mode]; !ok {
return nil, fmt.Errorf("Unsupported MacVlan mode specified: %s", mode)
}
} else {
mode = "bridge"
}
if err := netlink.NetworkLinkAddMacVlan(masterDev, macVlanDev, opts.Mode); err != nil {
return nil, err
}
macVlanIfc, err := net.InterfaceByName(macVlanDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
if macaddr != "" {
if _, err = net.ParseMAC(macaddr); err == nil {
if err := netlink.NetworkSetMacAddress(macVlanIfc, macaddr); err != nil {
if errDel := DeleteLink(macVlanIfc.Name); err != nil {
return nil, fmt.Errorf("Incorrect options specified. Attempt to delete the link failed: %s",
errDel)
}
}
}
}
masterIfc, err := net.InterfaceByName(masterDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &MacVlanLink{
Link: Link{
ifc: macVlanIfc,
},
masterIfc: masterIfc,
mode: mode,
}, nil
}