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