Bumped ipvlan kernel version to >= 4.2

- ipvlan l2 mode is buggy in < 4.2

Signed-off-by: Brent Salisbury <brent@docker.com>

libnetwork/drivers/ipvlan/ipvlan_network.go

@@ -20,8 +20,8 @@ func (d *driver) CreateNetwork(nid string, option map[string]interface{}, ipV4Da
 	if err != nil {
 		return fmt.Errorf("Failed to check kernel version for %s driver support: %v", ipvlanType, err)
 	}
-	// ensure Kernel version is greater then v4.0 for ipvlan support
-	if kv.Kernel < ipvlanKernelVer {
+	// ensure Kernel version is >= v4.2 for ipvlan support
+	if kv.Kernel < ipvlanKernelVer || (kv.Kernel == ipvlanKernelVer && kv.Major < ipvlanMajorVer) {
 		return fmt.Errorf("kernel version failed to meet the minimum ipvlan kernel requirement of %d.%d, found %d.%d.%d",
 			ipvlanKernelVer, ipvlanMajorVer, kv.Kernel, kv.Major, kv.Minor)
 	}

libnetwork/drivers/ipvlan/ipvlan_setup.go

@@ -15,7 +15,7 @@ import (
 const (
 	dummyPrefix     = "di-" // ipvlan prefix for dummy parent interface
 	ipvlanKernelVer = 4     // minimum ipvlan kernel support
-	ipvlanMajorVer  = 0     // minimum ipvlan major kernel support
+	ipvlanMajorVer  = 2     // minimum ipvlan major kernel support
 )
 
 // createIPVlan Create the ipvlan slave specifying the source name

libnetwork/drivers/macvlan/macvlan_network.go

@@ -20,7 +20,7 @@ func (d *driver) CreateNetwork(nid string, option map[string]interface{}, ipV4Da
 	if err != nil {
 		return fmt.Errorf("failed to check kernel version for %s driver support: %v", macvlanType, err)
 	}
-	// ensure Kernel version is greater then v3.9 for macvlan support
+	// ensure Kernel version is >= v3.9 for macvlan support
 	if kv.Kernel < macvlanKernelVer || (kv.Kernel == macvlanKernelVer && kv.Major < macvlanMajorVer) {
 		return fmt.Errorf("kernel version failed to meet the minimum macvlan kernel requirement of %d.%d, found %d.%d.%d",
 			macvlanKernelVer, macvlanMajorVer, kv.Kernel, kv.Major, kv.Minor)