ITQC/containernetworking-plugins
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host-device: Bring interfaces up after moving into container

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If an interface is not configured with IPAM (because it functions at
layer 2), it will not be brought up otherwise.

Signed-off-by: David Ward <david.ward@ll.mit.edu>
This commit is contained in:
David Ward
2021-12-24 07:53:44 -05:00
committed by Casey Callendrello
parent 27e830b73e
commit 3b2afc93dc
2 changed files with 32 additions and 16 deletions
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24
plugins/main/host-device/host-device.go
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@ -230,6 +230,10 @@ func moveLinkIn(hostDev netlink.Link, containerNs ns.NetNS, ifName string) (netl
if err := netlink.LinkSetName(contDev, ifName); err != nil {
return fmt.Errorf("failed to rename device %q to %q: %v", hostDev.Attrs().Name, ifName, err)
}
// Bring container device up
if err = netlink.LinkSetUp(contDev); err != nil {
return fmt.Errorf("failed to set %q up: %v", ifName, err)
}
// Retrieve link again to get up-to-date name and attributes
contDev, err = netlink.LinkByName(ifName)
if err != nil {
@ -261,17 +265,21 @@ func moveLinkOut(containerNs ns.NetNS, ifName string) error {
return fmt.Errorf("failed to set %q down: %v", ifName, err)
}
// Rename device to it's original name
defer func() {
// If moving the device to the host namespace fails, set its name back to ifName so that this
// function can be retried. Also bring the device back up, unless it was already down before.
if err != nil {
_ = netlink.LinkSetName(dev, ifName)
if dev.Attrs().Flags & net.FlagUp == net.FlagUp {
_ = netlink.LinkSetUp(dev)
}
}
}()
// Rename the device to its original name from the host namespace
if err = netlink.LinkSetName(dev, dev.Attrs().Alias); err != nil {
return fmt.Errorf("failed to restore %q to original name %q: %v", ifName, dev.Attrs().Alias, err)
}
defer func() {
if err != nil {
// if moving device to host namespace fails, we should revert device name
// to ifName to make sure that device can be found in retries
_ = netlink.LinkSetName(dev, ifName)
}
}()
if err = netlink.LinkSetNsFd(dev, int(defaultNs.Fd())); err != nil {
return fmt.Errorf("failed to move %q to host netns: %v", dev.Attrs().Alias, err)