ipv6: Add support for ipv6

Do not ignore ipv6 addresses and routes. These are now processed
along with ipv4 addresses/routes. Add unit tests to verify ipv6.

Fixes #147

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

virtcontainers/network.go

@@ -592,7 +592,7 @@ func tapNetworkPair(endpoint Endpoint, queues int, disableVhostNet bool) error {
 	}
 
 	// Clear the IP addresses from the veth interface to prevent ARP conflict
-	netPair.VirtIface.Addrs, err = netlink.AddrList(link, netlink.FAMILY_V4)
+	netPair.VirtIface.Addrs, err = netlink.AddrList(link, netlink.FAMILY_ALL)
 	if err != nil {
 		return fmt.Errorf("Unable to obtain veth IP addresses: %s", err)
 	}
@@ -954,25 +954,21 @@ func generateInterfacesAndRoutes(networkNS NetworkNamespace) ([]*vcTypes.Interfa
 
 		var ipAddresses []*vcTypes.IPAddress
 		for _, addr := range endpoint.Properties().Addrs {
-			// Skip IPv6 because not supported
-			if addr.IP.To4() == nil {
-				// Skip IPv6 because not supported
-				networkLogger().WithFields(logrus.Fields{
-					"unsupported-address-type": "ipv6",
-					"address":                  addr,
-				}).Warn("unsupported address")
-				continue
-			}
 			// Skip localhost interface
 			if addr.IP.IsLoopback() {
 				continue
 			}
+
 			netMask, _ := addr.Mask.Size()
 			ipAddress := vcTypes.IPAddress{
 				Family:  netlink.FAMILY_V4,
 				Address: addr.IP.String(),
 				Mask:    fmt.Sprintf("%d", netMask),
 			}
+
+			if addr.IP.To4() == nil {
+				ipAddress.Family = netlink.FAMILY_V6
+			}
 			ipAddresses = append(ipAddresses, &ipAddress)
 		}
 		noarp := endpoint.Properties().Iface.RawFlags & unix.IFF_NOARP
@@ -997,28 +993,10 @@ func generateInterfacesAndRoutes(networkNS NetworkNamespace) ([]*vcTypes.Interfa
 
 			if route.Dst != nil {
 				r.Dest = route.Dst.String()
-
-				if route.Dst.IP.To4() == nil {
-					// Skip IPv6 because not supported
-					networkLogger().WithFields(logrus.Fields{
-						"unsupported-route-type": "ipv6",
-						"destination":            r.Dest,
-					}).Warn("unsupported route")
-					continue
-				}
 			}
 
 			if route.Gw != nil {
 				gateway := route.Gw.String()
-
-				if route.Gw.To4() == nil {
-					// Skip IPv6 because is is not supported
-					networkLogger().WithFields(logrus.Fields{
-						"unsupported-route-type": "ipv6",
-						"gateway":                gateway,
-					}).Warn("unsupported route")
-					continue
-				}
 				r.Gateway = gateway
 			}
 

virtcontainers/network_test.go

@@ -6,6 +6,7 @@
 package virtcontainers
 
 import (
+	"fmt"
 	"net"
 	"os"
 	"reflect"
@@ -40,10 +41,12 @@ func TestGenerateInterfacesAndRoutes(t *testing.T) {
 	//
 	address1 := &net.IPNet{IP: net.IPv4(172, 17, 0, 2), Mask: net.CIDRMask(16, 32)}
 	address2 := &net.IPNet{IP: net.IPv4(182, 17, 0, 2), Mask: net.CIDRMask(16, 32)}
+	address3 := &net.IPNet{IP: net.ParseIP("2001:db8:1::242:ac11:2"), Mask: net.CIDRMask(64, 128)}
 
 	addrs := []netlink.Addr{
 		{IPNet: address1, Label: "phyaddr1"},
 		{IPNet: address2, Label: "phyaddr2"},
+		{IPNet: address3, Label: "phyaddr3"},
 	}
 
 	// Create a couple of routes:
@@ -51,9 +54,14 @@ func TestGenerateInterfacesAndRoutes(t *testing.T) {
 	src2 := net.IPv4(172, 17, 0, 2)
 	gw2 := net.IPv4(172, 17, 0, 1)
 
+	dstV6 := &net.IPNet{IP: net.ParseIP("2001:db8:1::"), Mask: net.CIDRMask(64, 128)}
+	gatewayV6 := net.ParseIP("2001:db8:1::1")
+
 	routes := []netlink.Route{
 		{LinkIndex: 329, Dst: nil, Src: nil, Gw: net.IPv4(172, 17, 0, 1), Scope: netlink.Scope(254)},
 		{LinkIndex: 329, Dst: dst2, Src: src2, Gw: gw2},
+		{LinkIndex: 329, Dst: dstV6, Src: nil, Gw: nil},
+		{LinkIndex: 329, Dst: nil, Src: nil, Gw: gatewayV6},
 	}
 
 	networkInfo := NetworkInfo{
@@ -83,6 +91,7 @@ func TestGenerateInterfacesAndRoutes(t *testing.T) {
 	expectedAddresses := []*vcTypes.IPAddress{
 		{Family: netlink.FAMILY_V4, Address: "172.17.0.2", Mask: "16"},
 		{Family: netlink.FAMILY_V4, Address: "182.17.0.2", Mask: "16"},
+		{Family: netlink.FAMILY_V6, Address: "2001:db8:1::242:ac11:2", Mask: "64"},
 	}
 
 	expectedInterfaces := []*vcTypes.Interface{
@@ -92,6 +101,12 @@ func TestGenerateInterfacesAndRoutes(t *testing.T) {
 	expectedRoutes := []*vcTypes.Route{
 		{Dest: "", Gateway: "172.17.0.1", Device: "eth0", Source: "", Scope: uint32(254)},
 		{Dest: "172.17.0.0/16", Gateway: "172.17.0.1", Device: "eth0", Source: "172.17.0.2"},
+		{Dest: "2001:db8:1::/64", Gateway: "", Device: "eth0", Source: ""},
+		{Dest: "", Gateway: "2001:db8:1::1", Device: "eth0", Source: ""},
+	}
+
+	for _, r := range resRoutes {
+		fmt.Printf("resRoute: %+v\n", r)
 	}
 
 	assert.Nil(t, err, "unexpected failure when calling generateKataInterfacesAndRoutes")