Assigning Address driver options

endpoint.go

@@ -60,6 +60,8 @@ type endpoint struct {
 	anonymous     bool
 	generic       map[string]interface{}
 	joinLeaveDone chan struct{}
+	prefAddress   net.IP
+	ipamOptions   map[string]string
 	dbIndex       uint64
 	dbExists      bool
 	sync.Mutex
@@ -685,6 +687,14 @@ func EndpointOptionGeneric(generic map[string]interface{}) EndpointOption {
 	}
 }
 
+// CreateOptionIpam function returns an option setter for the ipam configuration for this endpoint
+func CreateOptionIpam(prefAddress net.IP, ipamOptions map[string]string) EndpointOption {
+	return func(ep *endpoint) {
+		ep.prefAddress = prefAddress
+		ep.ipamOptions = ipamOptions
+	}
+}
+
 // CreateOptionExposedPorts function returns an option setter for the container exposed
 // ports option to be passed to network.CreateEndpoint() method.
 func CreateOptionExposedPorts(exposedPorts []types.TransportPort) EndpointOption {
@@ -799,7 +809,7 @@ func (ep *endpoint) assignAddressVersion(ipVer int, ipam ipamapi.Ipam) error {
 		if *address != nil {
 			prefIP = (*address).IP
 		}
-		addr, _, err := ipam.RequestAddress(d.PoolID, prefIP, nil)
+		addr, _, err := ipam.RequestAddress(d.PoolID, prefIP, ep.ipamOptions)
 		if err == nil {
 			ep.Lock()
 			*address = addr

ipamapi/contract.go

@@ -16,6 +16,8 @@ const (
 	DefaultIPAM = "default"
 	// PluginEndpointType represents the Endpoint Type used by Plugin system
 	PluginEndpointType = "IpamDriver"
+	// RequestAddressType represents the Address Type used when requesting an address
+	RequestAddressType = "RequestAddressType"
 )
 
 // Callback provides a Callback interface for registering an IPAM instance into LibNetwork

network.go

@@ -971,7 +971,10 @@ func (n *network) ipamAllocateVersion(ipVer int, ipam ipamapi.Ipam) error {
 		// irrespective of whether ipam driver returned a gateway already.
 		// If none of the above is true, libnetwork will allocate one.
 		if cfg.Gateway != "" || d.Gateway == nil {
-			if d.Gateway, _, err = ipam.RequestAddress(d.PoolID, net.ParseIP(cfg.Gateway), nil); err != nil {
+			var gatewayOpts = map[string]string{
+				ipamapi.RequestAddressType: netlabel.Gateway,
+			}
+			if d.Gateway, _, err = ipam.RequestAddress(d.PoolID, net.ParseIP(cfg.Gateway), gatewayOpts); err != nil {
 				return types.InternalErrorf("failed to allocate gateway (%v): %v", cfg.Gateway, err)
 			}
 		}