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68 lines
2 KiB
Go
68 lines
2 KiB
Go
package bridge
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import (
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"fmt"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/pkg/parsers/kernel"
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"github.com/docker/libnetwork/netutils"
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"github.com/vishvananda/netlink"
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)
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// SetupDevice create a new bridge interface/
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func setupDevice(config *networkConfiguration, i *bridgeInterface) error {
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var setMac bool
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// We only attempt to create the bridge when the requested device name is
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// the default one.
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if config.BridgeName != DefaultBridgeName && config.DefaultBridge {
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return NonDefaultBridgeExistError(config.BridgeName)
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}
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// Set the bridgeInterface netlink.Bridge.
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i.Link = &netlink.Bridge{
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LinkAttrs: netlink.LinkAttrs{
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Name: config.BridgeName,
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},
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}
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// Only set the bridge's MAC address if the kernel version is > 3.3, as it
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// was not supported before that.
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kv, err := kernel.GetKernelVersion()
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if err != nil {
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logrus.Errorf("Failed to check kernel versions: %v. Will not assign a MAC address to the bridge interface", err)
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} else {
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setMac = kv.Kernel > 3 || (kv.Kernel == 3 && kv.Major >= 3)
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}
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if err = i.nlh.LinkAdd(i.Link); err != nil {
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logrus.Debugf("Failed to create bridge %s via netlink. Trying ioctl", config.BridgeName)
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return ioctlCreateBridge(config.BridgeName, setMac)
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}
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if setMac {
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hwAddr := netutils.GenerateRandomMAC()
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if err = i.nlh.LinkSetHardwareAddr(i.Link, hwAddr); err != nil {
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return fmt.Errorf("failed to set bridge mac-address %s : %s", hwAddr, err.Error())
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}
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logrus.Debugf("Setting bridge mac address to %s", hwAddr)
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}
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return err
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}
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// SetupDeviceUp ups the given bridge interface.
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func setupDeviceUp(config *networkConfiguration, i *bridgeInterface) error {
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err := i.nlh.LinkSetUp(i.Link)
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if err != nil {
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return fmt.Errorf("Failed to set link up for %s: %v", config.BridgeName, err)
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}
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// Attempt to update the bridge interface to refresh the flags status,
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// ignoring any failure to do so.
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if lnk, err := i.nlh.LinkByName(config.BridgeName); err == nil {
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i.Link = lnk
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} else {
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logrus.Warnf("Failed to retrieve link for interface (%s): %v", config.BridgeName, err)
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}
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return nil
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}
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