Merge pull request #7314 from aojea/ipv6_default_gw

IPv6 default route

pkg/domain/infra/abi/network.go

@@ -191,7 +191,7 @@ func createBridge(r *libpod.Runtime, name string, options entities.NetworkCreate
 	var plugins []network.CNIPlugins
 	var routes []network.IPAMRoute
 
-	defaultRoute, err := network.NewIPAMDefaultRoute()
+	defaultRoute, err := network.NewIPAMDefaultRoute(network.IsIPv6(subnet.IP))
 	if err != nil {
 		return "", err
 	}

pkg/network/ip.go

@@ -12,3 +12,8 @@ func CalcGatewayIP(ipn *net.IPNet) net.IP {
 	nid := ipn.IP.Mask(ipn.Mask)
 	return ip.NextIP(nid)
 }
+
+// IsIPv6 returns if netIP is IPv6.
+func IsIPv6(netIP net.IP) bool {
+	return netIP != nil && netIP.To4() == nil
+}

pkg/network/netconflist.go

@@ -6,6 +6,11 @@ import (
 	"path/filepath"
 )
 
+const (
+	defaultIPv4Route = "0.0.0.0/0"
+	defaultIPv6Route = "::/0"
+)
+
 // NcList describes a generic map
 type NcList map[string]interface{}
 
@@ -86,9 +91,13 @@ func NewIPAMRoute(r *net.IPNet) IPAMRoute { //nolint:interfacer
 }
 
 // NewIPAMDefaultRoute creates a new IPAMDefault route of
-// 0.0.0.0/0
+// 0.0.0.0/0 for IPv4 or ::/0 for IPv6
-func NewIPAMDefaultRoute() (IPAMRoute, error) {
+func NewIPAMDefaultRoute(isIPv6 bool) (IPAMRoute, error) {
-	_, n, err := net.ParseCIDR("0.0.0.0/0")
+	route := defaultIPv4Route
+	if isIPv6 {
+		route = defaultIPv6Route
+	}
+	_, n, err := net.ParseCIDR(route)
 	if err != nil {
 		return IPAMRoute{}, err
 	}

pkg/network/netconflist_test.go

@@ -0,0 +1,38 @@
+package network
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestNewIPAMDefaultRoute(t *testing.T) {
+
+	tests := []struct {
+		name   string
+		isIPv6 bool
+		want   IPAMRoute
+	}{
+		{
+			name:   "IPv4 default route",
+			isIPv6: false,
+			want:   IPAMRoute{defaultIPv4Route},
+		},
+		{
+			name:   "IPv6 default route",
+			isIPv6: true,
+			want:   IPAMRoute{defaultIPv6Route},
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewIPAMDefaultRoute(tt.isIPv6)
+			if err != nil {
+				t.Errorf("no errorr expected: %v", err)
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewIPAMDefaultRoute() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

test/e2e/network_create_test.go

@@ -178,6 +178,47 @@ var _ = Describe("Podman network create", func() {
 		Expect(subnet.Contains(containerIP)).To(BeTrue())
 	})
 
+	It("podman network create with name and IPv6 subnet", func() {
+		SkipIfRemote()
+		var (
+			results []network.NcList
+		)
+		nc := podmanTest.Podman([]string{"network", "create", "--subnet", "fd00:1:2:3:4::/64", "newIPv6network"})
+		nc.WaitWithDefaultTimeout()
+		Expect(nc.ExitCode()).To(BeZero())
+
+		defer podmanTest.removeCNINetwork("newIPv6network")
+
+		// Inspect the network configuration
+		inspect := podmanTest.Podman([]string{"network", "inspect", "newIPv6network"})
+		inspect.WaitWithDefaultTimeout()
+
+		// JSON the network configuration into something usable
+		err := json.Unmarshal([]byte(inspect.OutputToString()), &results)
+		Expect(err).To(BeNil())
+		result := results[0]
+		Expect(result["name"]).To(Equal("newIPv6network"))
+
+		// JSON the bridge info
+		bridgePlugin, err := genericPluginsToBridge(result["plugins"], "bridge")
+		Expect(err).To(BeNil())
+		Expect(bridgePlugin.IPAM.Routes[0].Dest).To(Equal("::/0"))
+
+		// Once a container executes a new network, the nic will be created. We should clean those up
+		// best we can
+		defer removeNetworkDevice(bridgePlugin.BrName)
+
+		try := podmanTest.Podman([]string{"run", "-it", "--rm", "--network", "newIPv6network", ALPINE, "sh", "-c", "ip addr show eth0 |  grep global | awk ' /inet6 / {print $2}'"})
+		try.WaitWithDefaultTimeout()
+
+		_, subnet, err := net.ParseCIDR("fd00:1:2:3:4::/64")
+		Expect(err).To(BeNil())
+		containerIP, _, err := net.ParseCIDR(try.OutputToString())
+		Expect(err).To(BeNil())
+		// Ensure that the IP the container got is within the subnet the user asked for
+		Expect(subnet.Contains(containerIP)).To(BeTrue())
+	})
+
 	It("podman network create with invalid subnet", func() {
 		nc := podmanTest.Podman([]string{"network", "create", "--subnet", "10.11.12.0/17000", "fail"})
 		nc.WaitWithDefaultTimeout()