Changes for checking the global version for modify policy version sup…

…port. (microsoft#2139)

Signed-off-by: Prince Pereira <ppereira@microsoft.com>

hcn.go

@@ -264,6 +264,18 @@ func SetPolicySupported() error {
 	return platformDoesNotSupportError("SetPolicy")
 }
 
+// ModifyLoadbalancerSupported returns an error if the HCN version does not support ModifyLoadbalancer.
+func ModifyLoadbalancerSupported() error {
+	supported, err := GetCachedSupportedFeatures()
+	if err != nil {
+		return err
+	}
+	if supported.ModifyLoadbalancer {
+		return nil
+	}
+	return platformDoesNotSupportError("ModifyLoadbalancer")
+}
+
 // VxlanPortSupported returns an error if the HCN version does not support configuring the VXLAN TCP port.
 func VxlanPortSupported() error {
 	supported, err := GetCachedSupportedFeatures()

hcnerrors.go

@@ -52,6 +52,7 @@ type ErrorCode uint32
 const (
 	ERROR_NOT_FOUND                     = ErrorCode(windows.ERROR_NOT_FOUND)
 	HCN_E_PORT_ALREADY_EXISTS ErrorCode = ErrorCode(windows.HCN_E_PORT_ALREADY_EXISTS)
+	HCN_E_NOTIMPL             ErrorCode = ErrorCode(windows.E_NOTIMPL)
 )
 
 type HcnError struct {
@@ -79,6 +80,10 @@ func IsPortAlreadyExistsError(err error) bool {
 	return CheckErrorWithCode(err, HCN_E_PORT_ALREADY_EXISTS)
 }
 
+func IsNotImplemented(err error) bool {
+	return CheckErrorWithCode(err, HCN_E_NOTIMPL)
+}
+
 func new(hr error, title string, rest string) error {
 	err := &HcnError{}
 	hcsError := hcserror.New(hr, title, rest)

hcnglobals.go

@@ -87,6 +87,8 @@ var (
 
 	//HNS 15.1 allows support for DisableHostPort flag.
 	DisableHostPortVersion = VersionRanges{VersionRange{MinVersion: Version{Major: 15, Minor: 1}, MaxVersion: Version{Major: math.MaxInt32, Minor: math.MaxInt32}}}
+	// HNS 15.4 allows for Modify Loadbalancer support
+	ModifyLoadbalancerVersion = VersionRanges{VersionRange{MinVersion: Version{Major: 15, Minor: 4}, MaxVersion: Version{Major: math.MaxInt32, Minor: math.MaxInt32}}}
 )
 
 // GetGlobals returns the global properties of the HCN Service.

hcnsupport.go

@@ -38,6 +38,7 @@ type SupportedFeatures struct {
 	NetworkACL               bool        `json:"NetworkACL"`
 	NestedIpSet              bool        `json:"NestedIpSet"`
 	DisableHostPort          bool        `json:"DisableHostPort"`
+	ModifyLoadbalancer       bool        `json:"ModifyLoadbalancer"`
 }
 
 // AclFeatures are the supported ACL possibilities.
@@ -116,6 +117,7 @@ func getSupportedFeatures() (SupportedFeatures, error) {
 	features.NetworkACL = isFeatureSupported(globals.Version, NetworkACLPolicyVersion)
 	features.NestedIpSet = isFeatureSupported(globals.Version, NestedIpSetVersion)
 	features.DisableHostPort = isFeatureSupported(globals.Version, DisableHostPortVersion)
+	features.ModifyLoadbalancer = isFeatureSupported(globals.Version, ModifyLoadbalancerVersion)
 
 	log.L.WithFields(logrus.Fields{
 		"version":           globals.Version,