Function TestNoLinkLocalAutoGenForLoopbackNIC

pkg/tcpip/stack/stack_test.go:2907–2950

TestNoLinkLocalAutoGenForLoopbackNIC tests that IPv6 link-local addresses are not auto-generated for loopback NICs.

(t *testing.T)

// TestNoLinkLocalAutoGenForLoopbackNIC tests that IPv6 link-local addresses are
// not auto-generated for loopback NICs.
func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) {
	const nicID = 1
	const nicName = "nicName"

	tests := []struct {
		name          string
		opaqueIIDOpts ipv6.OpaqueInterfaceIdentifierOptions
	}{
		{
			name:          "IID From MAC",
			opaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{},
		},
		{
			name: "Opaque IID",
			opaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{
				NICNameFromID: func(_ tcpip.NICID, nicName string) string {
					return nicName
				},
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			opts := stack.Options{
				NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{
					AutoGenLinkLocal: true,
					OpaqueIIDOpts:    test.opaqueIIDOpts,
				})},
			}

			e := loopback.New()
			s := stack.New(opts)
			nicOpts := stack.NICOptions{Name: nicName}
			if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil {
				t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, nicOpts, err)
			}

			if err := checkGetMainNICAddress(s, 1, header.IPv6ProtocolNumber, tcpip.AddressWithPrefix{}); err != nil {
				t.Fatal(err)
			}
		})
	}
}

// TestNICAutoGenAddrDoesDAD tests that the successful auto-generation of IPv6
// link-local addresses will only be assigned after the DAD process resolves.