7 "github.com/Sirupsen/logrus"
8 "github.com/vishvananda/netlink"
12 // DefaultBridgeName is the default name for the bridge interface managed
13 // by the driver when unspecified by the caller.
14 DefaultBridgeName = "docker0"
17 // Interface models the bridge network device.
18 type bridgeInterface struct {
27 // newInterface creates a new bridge interface structure. It attempts to find
28 // an already existing device identified by the configuration BridgeName field,
29 // or the default bridge name when unspecified, but doesn't attempt to create
31 func newInterface(nlh *netlink.Handle, config *networkConfiguration) (*bridgeInterface, error) {
33 i := &bridgeInterface{nlh: nlh}
35 // Initialize the bridge name to the default if unspecified.
36 if config.BridgeName == "" {
37 config.BridgeName = DefaultBridgeName
40 // Attempt to find an existing bridge named with the specified name.
41 i.Link, err = nlh.LinkByName(config.BridgeName)
43 logrus.Debugf("Did not find any interface with name %s: %v", config.BridgeName, err)
44 } else if _, ok := i.Link.(*netlink.Bridge); !ok {
45 return nil, fmt.Errorf("existing interface %s is not a bridge", i.Link.Attrs().Name)
50 // exists indicates if the existing bridge interface exists on the system.
51 func (i *bridgeInterface) exists() bool {
55 // addresses returns all IPv4 addresses and all IPv6 addresses for the bridge interface.
56 func (i *bridgeInterface) addresses() ([]netlink.Addr, []netlink.Addr, error) {
57 v4addr, err := i.nlh.AddrList(i.Link, netlink.FAMILY_V4)
59 return nil, nil, fmt.Errorf("Failed to retrieve V4 addresses: %v", err)
62 v6addr, err := i.nlh.AddrList(i.Link, netlink.FAMILY_V6)
64 return nil, nil, fmt.Errorf("Failed to retrieve V6 addresses: %v", err)
68 return nil, v6addr, nil
70 return v4addr, v6addr, nil
73 func (i *bridgeInterface) programIPv6Address() error {
74 _, nlAddressList, err := i.addresses()
76 return &IPv6AddrAddError{IP: i.bridgeIPv6, Err: fmt.Errorf("failed to retrieve address list: %v", err)}
78 nlAddr := netlink.Addr{IPNet: i.bridgeIPv6}
79 if findIPv6Address(nlAddr, nlAddressList) {
82 if err := i.nlh.AddrAdd(i.Link, &nlAddr); err != nil {
83 return &IPv6AddrAddError{IP: i.bridgeIPv6, Err: err}