integration-cli: Add Tests for IPv6 and Fixed CIDR

This patch adds tests for the `--ipv6` and `--fixed-cidr` daemon flags

Signed-off-by: Dave Tucker <dt@docker.com>

integration-cli/docker_cli_daemon_test.go

@@ -203,6 +203,123 @@ func (s *DockerDaemonSuite) TestDaemonIptablesCreate(c *check.C) {
 	}
 }
 
+// TestDaemonIPv6Enabled checks that when the daemon is started with --ipv6=true that the docker0 bridge
+// has the fe80::1 address and that a container is assigned a link-local address
+func (s *DockerSuite) TestDaemonIPv6Enabled(c *check.C) {
+	testRequires(c, IPv6)
+
+	if err := setupV6(); err != nil {
+		c.Fatal("Could not set up host for IPv6 tests")
+	}
+
+	d := NewDaemon(c)
+
+	if err := d.StartWithBusybox("--ipv6"); err != nil {
+		c.Fatal(err)
+	}
+	defer d.Stop()
+
+	iface, err := net.InterfaceByName("docker0")
+	if err != nil {
+		c.Fatalf("Error getting docker0 interface: %v", err)
+	}
+
+	addrs, err := iface.Addrs()
+	if err != nil {
+		c.Fatalf("Error getting addresses for docker0 interface: %v", err)
+	}
+
+	var found bool
+	expected := "fe80::1/64"
+
+	for i := range addrs {
+		if addrs[i].String() == expected {
+			found = true
+		}
+	}
+
+	if !found {
+		c.Fatalf("Bridge does not have an IPv6 Address")
+	}
+
+	if out, err := d.Cmd("run", "-itd", "--name=ipv6test", "busybox:latest"); err != nil {
+		c.Fatalf("Could not run container: %s, %v", out, err)
+	}
+
+	out, err := d.Cmd("inspect", "--format", "'{{.NetworkSettings.LinkLocalIPv6Address}}'", "ipv6test")
+	out = strings.Trim(out, " \r\n'")
+
+	if err != nil {
+		c.Fatalf("Error inspecting container: %s, %v", out, err)
+	}
+
+	if ip := net.ParseIP(out); ip == nil {
+		c.Fatalf("Container should have a link-local IPv6 address")
+	}
+
+	out, err = d.Cmd("inspect", "--format", "'{{.NetworkSettings.GlobalIPv6Address}}'", "ipv6test")
+	out = strings.Trim(out, " \r\n'")
+
+	if err != nil {
+		c.Fatalf("Error inspecting container: %s, %v", out, err)
+	}
+
+	if ip := net.ParseIP(out); ip != nil {
+		c.Fatalf("Container should not have a global IPv6 address: %v", out)
+	}
+
+	if err := teardownV6(); err != nil {
+		c.Fatal("Could not perform teardown for IPv6 tests")
+	}
+
+}
+
+// TestDaemonIPv6FixedCIDR checks that when the daemon is started with --ipv6=true and a fixed CIDR
+// that running containers are given a link-local and global IPv6 address
+func (s *DockerSuite) TestDaemonIPv6FixedCIDR(c *check.C) {
+	testRequires(c, IPv6)
+
+	if err := setupV6(); err != nil {
+		c.Fatal("Could not set up host for IPv6 tests")
+	}
+
+	d := NewDaemon(c)
+
+	if err := d.StartWithBusybox("--ipv6", "--fixed-cidr-v6='2001:db8:1::/64'"); err != nil {
+		c.Fatalf("Could not start daemon with busybox: %v", err)
+	}
+	defer d.Stop()
+
+	if out, err := d.Cmd("run", "-itd", "--name=ipv6test", "busybox:latest"); err != nil {
+		c.Fatalf("Could not run container: %s, %v", out, err)
+	}
+
+	out, err := d.Cmd("inspect", "--format", "'{{.NetworkSettings.LinkLocalIPv6Address}}'", "ipv6test")
+	out = strings.Trim(out, " \r\n'")
+
+	if err != nil {
+		c.Fatalf("Error inspecting container: %s, %v", out, err)
+	}
+
+	if ip := net.ParseIP(out); ip == nil {
+		c.Fatalf("Container should have a link-local IPv6 address")
+	}
+
+	out, err = d.Cmd("inspect", "--format", "'{{.NetworkSettings.GlobalIPv6Address}}'", "ipv6test")
+	out = strings.Trim(out, " \r\n'")
+
+	if err != nil {
+		c.Fatalf("Error inspecting container: %s, %v", out, err)
+	}
+
+	if ip := net.ParseIP(out); ip == nil {
+		c.Fatalf("Container should have a global IPv6 address")
+	}
+	if err := teardownV6(); err != nil {
+		c.Fatal("Could not perform teardown for IPv6 tests")
+	}
+}
+
 func (s *DockerDaemonSuite) TestDaemonLogLevelWrong(c *check.C) {
 	c.Assert(s.d.Start("--log-level=bogus"), check.NotNil, check.Commentf("Daemon shouldn't start with wrong log level"))
 }
@@ -1274,4 +1391,22 @@ func (s *DockerDaemonSuite) TestDaemonNoTlsCliTlsVerifyWithEnv(c *check.C) {
 	out, _, err := runCommandWithOutput(cmd)
 	c.Assert(err, check.Not(check.IsNil), check.Commentf("%s", out))
 	c.Assert(strings.Contains(out, "error occurred trying to connect"), check.Equals, true)
+
+}
+
+func setupV6() error {
+	// Hack to get the right IPv6 address on docker0, which has already been created
+	err := exec.Command("ip", "addr", "add", "fe80::1/64", "dev", "docker0").Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func teardownV6() error {
+	err := exec.Command("ip", "addr", "del", "fe80::1/64", "dev", "docker0").Run()
+	if err != nil {
+		return err
+	}
+	return nil
 }

integration-cli/requirements.go

@@ -96,6 +96,17 @@ var (
 		},
 		"Test requires underlying root filesystem not be backed by overlay.",
 	}
+	IPv6 = TestRequirement{
+		func() bool {
+			cmd := exec.Command("test", "-f", "/proc/net/if_inet6")
+
+			if err := cmd.Run(); err != nil {
+				return true
+			}
+			return false
+		},
+		"Test requires support for IPv6",
+	}
 )
 
 // testRequires checks if the environment satisfies the requirements