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Merge pull request #86453 from pjh/lwvnic

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Update Windows subnet mask calculation for compatibility with future VNIC changes
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Kubernetes Prow Robot 2019-12-20 04:03:32 -08:00 committed by GitHub
commit 13e3904f0f
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1 changed files with 11 additions and 2 deletions
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13
cluster/gce/windows/k8s-node-setup.psm1
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@ -457,8 +457,17 @@ function Get_MgmtSubnet {
$addr = (Get-NetIPAddress `
-InterfaceAlias ${net_adapter}.ifAlias `
-AddressFamily IPv4).IPAddress
$mask = (Get-WmiObject Win32_NetworkAdapterConfiguration |
Where-Object InterfaceIndex -eq $(${net_adapter}.ifIndex)).IPSubnet[0]
# Get the adapter's mask from the registry rather than WMI or some other
# approach: this is compatible with Windows' forthcoming LWVNICs (lightweight
# VNICs).
# https://github.com/kubernetes-sigs/sig-windows-tools/pull/16/commits/c5b5c67d5da6c23ad870cb16146eaa58131caf29
$adapter_registry = Get-Item `
-Path ("HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\" +
"Parameters\Interfaces\$($net_adapter.InterfaceGuid)")
# In this command the value name is 'DhcpSubnetMask' for current network
# interfaces but could be different for "LWVNIC" interfaces.
$mask = ($adapter_registry.GetValueNames() -like "*SubnetMask" |
% { $adapter_registry.GetValue($_) })
$mgmt_subnet = `
(ConvertTo_DecimalIP ${addr}) -band (ConvertTo_DecimalIP ${mask})
$mgmt_subnet = ConvertTo_DottedDecimalIP ${mgmt_subnet}