Fixed IP information not displayed properly in docker network inspect

Signed-off-by: msabansal <sabansal@microsoft.com>

Author: msabansal

drivers/windows/windows.go

@@ -186,8 +186,11 @@ func (d *driver) CreateNetwork(id string, option map[string]interface{}, ipV4Dat
 
 		for _, ipData := range ipV4Data {
 			subnet := hcsshim.Subnet{
-				AddressPrefix:  ipData.Pool.String(),
-				GatewayAddress: ipData.Gateway.IP.String(),
+				AddressPrefix: ipData.Pool.String(),
+			}
+
+			if ipData.Gateway != nil {
+				subnet.GatewayAddress = ipData.Gateway.IP.String()
 			}
 
 			subnets = append(subnets, subnet)

endpoint.go

@@ -957,9 +957,13 @@ func (ep *endpoint) releaseAddress() {
 		log.Warnf("Failed to retrieve ipam driver to release interface address on delete of endpoint %s (%s): %v", ep.Name(), ep.ID(), err)
 		return
 	}
-	if err := ipam.ReleaseAddress(ep.iface.v4PoolID, ep.iface.addr.IP); err != nil {
-		log.Warnf("Failed to release ip address %s on delete of endpoint %s (%s): %v", ep.iface.addr.IP, ep.Name(), ep.ID(), err)
+
+	if ep.iface.addr != nil {
+		if err := ipam.ReleaseAddress(ep.iface.v4PoolID, ep.iface.addr.IP); err != nil {
+			log.Warnf("Failed to release ip address %s on delete of endpoint %s (%s): %v", ep.iface.addr.IP, ep.Name(), ep.ID(), err)
+		}
 	}
+
 	if ep.iface.addrv6 != nil && ep.iface.addrv6.IP.IsGlobalUnicast() {
 		if err := ipam.ReleaseAddress(ep.iface.v6PoolID, ep.iface.addrv6.IP); err != nil {
 			log.Warnf("Failed to release ip address %s on delete of endpoint %s (%s): %v", ep.iface.addrv6.IP, ep.Name(), ep.ID(), err)

ipams/windowsipam/windowsipam.go

@@ -6,6 +6,7 @@ import (
 	log "github.com/Sirupsen/logrus"
 	"github.com/docker/libnetwork/discoverapi"
 	"github.com/docker/libnetwork/ipamapi"
+	"github.com/docker/libnetwork/netlabel"
 	"github.com/docker/libnetwork/types"
 )
 
@@ -64,14 +65,19 @@ func (a *allocator) ReleasePool(poolID string) error {
 // RequestAddress returns an address from the specified pool ID.
 // Always allocate the 0.0.0.0/32 ip if no preferred address was specified
 func (a *allocator) RequestAddress(poolID string, prefAddress net.IP, opts map[string]string) (*net.IPNet, map[string]string, error) {
-	log.Debugf("RequestAddress(%s, %v, %v) %s", poolID, prefAddress, opts, opts["RequestAddressType"])
+	log.Debugf("RequestAddress(%s, %v, %v)", poolID, prefAddress, opts)
 	_, ipNet, err := net.ParseCIDR(poolID)
 
 	if err != nil {
 		return nil, nil, err
 	}
-	if prefAddress == nil {
+
+	// TODO Windows: Remove this once the bug in docker daemon is fixed
+	// that causes it to throw an exception on nil gateway
+	if opts[ipamapi.RequestAddressType] == netlabel.Gateway {
 		return ipNet, nil, nil
+	} else if prefAddress == nil {
+		return nil, nil, nil
 	}
 	return &net.IPNet{IP: prefAddress, Mask: ipNet.Mask}, nil, nil
 }

ipams/windowsipam/windowsipam_test.go

@@ -51,7 +51,7 @@ func TestWindowsIPAM(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if !types.CompareIPNet(ip, requestPool) {
+	if ip != nil {
 		t.Fatalf("Unexpected data returned. Expected %v . Got: %v ", requestPool, ip)
 	}