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7012e3ce14
It was only used in a single place, and a generic errdefs.ErrInvalid; the type itself was not used as sentinel error other than for a unit test. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
82 lines
2.6 KiB
Go
82 lines
2.6 KiB
Go
package bridge
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"github.com/containerd/log"
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"github.com/docker/docker/errdefs"
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"github.com/docker/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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if config.BridgeName != DefaultBridgeName && config.DefaultBridge {
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// TODO(thaJeztah): should this be an [errdefs.ErrInvalidParameter], not an [errdefs.ErrForbidden]?
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return errdefs.Forbidden(fmt.Errorf("bridge device with non default name %s must be created manually", 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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// Set the bridge's MAC address. Requires kernel version 3.3 or up.
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hwAddr := netutils.GenerateRandomMAC()
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i.Link.Attrs().HardwareAddr = hwAddr
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log.G(context.TODO()).Debugf("Setting bridge mac address to %s", hwAddr)
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if err := i.nlh.LinkAdd(i.Link); err != nil {
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log.G(context.TODO()).WithError(err).Errorf("Failed to create bridge %s via netlink", config.BridgeName)
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return err
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}
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return nil
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}
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func setupMTU(config *networkConfiguration, i *bridgeInterface) error {
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if err := i.nlh.LinkSetMTU(i.Link, config.Mtu); err != nil {
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log.G(context.TODO()).WithError(err).Errorf("Failed to set bridge MTU %s via netlink", config.BridgeName)
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return err
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}
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return nil
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}
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func setupDefaultSysctl(config *networkConfiguration, i *bridgeInterface) error {
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// Disable IPv6 router advertisements originating on the bridge
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sysPath := filepath.Join("/proc/sys/net/ipv6/conf/", config.BridgeName, "accept_ra")
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if _, err := os.Stat(sysPath); err != nil {
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log.G(context.TODO()).
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WithField("bridge", config.BridgeName).
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WithField("syspath", sysPath).
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Info("failed to read ipv6 net.ipv6.conf.<bridge>.accept_ra")
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return nil
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}
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if err := os.WriteFile(sysPath, []byte{'0', '\n'}, 0o644); err != nil {
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log.G(context.TODO()).WithError(err).Warn("unable to disable IPv6 router advertisement")
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}
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return nil
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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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log.G(context.TODO()).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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