4 files changed, 32 insertions, 35 deletions
diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go
index 8d89859ba..070d80c8d 100644
--- a/pkg/tcpip/stack/ndp_test.go
+++ b/pkg/tcpip/stack/ndp_test.go
@@ -2500,9 +2500,9 @@ func TestAutoGenAddrWithOpaqueIID(t *testing.T) {
 			SecretKey: secretKey,
 		},
 	})
-
-	if err := s.CreateNamedNIC(nicID, nicName, e); err != nil {
-		t.Fatalf("CreateNamedNIC(%d, %q, _) = %s", nicID, nicName, err)
+	opts := stack.NICOptions{Name: nicName}
+	if err := s.CreateNICWithOptions(nicID, e, opts); err != nil {
+		t.Fatalf("CreateNICWithOptions(%d, _, %+v, _) = %s", nicID, opts, err)
 	}
 
 	expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) {
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 807f910f6..fb7ac409e 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -796,9 +796,21 @@ func (s *Stack) NewPacketEndpoint(cooked bool, netProto tcpip.NetworkProtocolNum
 	return s.rawFactory.NewPacketEndpoint(s, cooked, netProto, waiterQueue)
 }
 
-// createNIC creates a NIC with the provided id and link-layer endpoint, and
-// optionally enable it.
-func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled bool) *tcpip.Error {
+// NICOptions specifies the configuration of a NIC as it is being created.
+// The zero value creates an enabled, unnamed NIC.
+type NICOptions struct {
+	// Name specifies the name of the NIC.
+	Name string
+
+	// Disabled specifies whether to avoid calling Attach on the passed
+	// LinkEndpoint.
+	Disabled bool
+}
+
+// CreateNICWithOptions creates a NIC with the provided id, LinkEndpoint, and
+// NICOptions. See the documentation on type NICOptions for details on how
+// NICs can be configured.
+func (s *Stack) CreateNICWithOptions(id tcpip.NICID, ep LinkEndpoint, opts NICOptions) *tcpip.Error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
@@ -807,38 +819,20 @@ func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled
 		return tcpip.ErrDuplicateNICID
 	}
 
-	n := newNIC(s, id, name, ep)
+	n := newNIC(s, id, opts.Name, ep)
 
 	s.nics[id] = n
-	if enabled {
+	if !opts.Disabled {
 		return n.enable()
 	}
 
 	return nil
 }
 
-// CreateNIC creates a NIC with the provided id and link-layer endpoint.
+// CreateNIC creates a NIC with the provided id and LinkEndpoint and calls
+// `LinkEndpoint.Attach` to start delivering packets to it.
 func (s *Stack) CreateNIC(id tcpip.NICID, ep LinkEndpoint) *tcpip.Error {
-	return s.createNIC(id, "", ep, true)
-}
-
-// CreateNamedNIC creates a NIC with the provided id and link-layer endpoint,
-// and a human-readable name.
-func (s *Stack) CreateNamedNIC(id tcpip.NICID, name string, ep LinkEndpoint) *tcpip.Error {
-	return s.createNIC(id, name, ep, true)
-}
-
-// CreateDisabledNIC creates a NIC with the provided id and link-layer endpoint,
-// but leave it disable. Stack.EnableNIC must be called before the link-layer
-// endpoint starts delivering packets to it.
-func (s *Stack) CreateDisabledNIC(id tcpip.NICID, ep LinkEndpoint) *tcpip.Error {
-	return s.createNIC(id, "", ep, false)
-}
-
-// CreateDisabledNamedNIC is a combination of CreateNamedNIC and
-// CreateDisabledNIC.
-func (s *Stack) CreateDisabledNamedNIC(id tcpip.NICID, name string, ep LinkEndpoint) *tcpip.Error {
-	return s.createNIC(id, name, ep, false)
+	return s.CreateNICWithOptions(id, ep, NICOptions{})
 }
 
 // EnableNIC enables the given NIC so that the link-layer endpoint can start
diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go
index 33f20579f..9ac50bb23 100644
--- a/pkg/tcpip/stack/stack_test.go
+++ b/pkg/tcpip/stack/stack_test.go
@@ -2097,8 +2097,9 @@ func TestNICAutoGenAddrWithOpaque(t *testing.T) {
 
 			e := channel.New(10, 1280, test.linkAddr)
 			s := stack.New(opts)
-			if err := s.CreateNamedNIC(nicID, test.nicName, e); err != nil {
-				t.Fatalf("CreateNamedNIC(%d, %q, _) = %s", nicID, test.nicName, err)
+			nicOpts := stack.NICOptions{Name: test.nicName}
+			if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil {
+				t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err)
 			}
 
 			addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber)
@@ -2156,8 +2157,9 @@ func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) {
 
 			e := loopback.New()
 			s := stack.New(opts)
-			if err := s.CreateNamedNIC(nicID, nicName, e); err != nil {
-				t.Fatalf("CreateNamedNIC(%d, %q, _) = %s", nicID, nicName, err)
+			nicOpts := stack.NICOptions{Name: nicName}
+			if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil {
+				t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, nicOpts, err)
 			}
 
 			addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber)
diff --git a/pkg/tcpip/stack/transport_demuxer_test.go b/pkg/tcpip/stack/transport_demuxer_test.go
index 3b28b06d0..33dbc0536 100644
--- a/pkg/tcpip/stack/transport_demuxer_test.go
+++ b/pkg/tcpip/stack/transport_demuxer_test.go
@@ -80,8 +80,9 @@ func newDualTestContextMultiNic(t *testing.T, mtu uint32, linkEpNames []string)
 	for i, linkEpName := range linkEpNames {
 		channelEP := channel.New(256, mtu, "")
 		nicID := tcpip.NICID(i + 1)
-		if err := s.CreateNamedNIC(nicID, linkEpName, channelEP); err != nil {
-			t.Fatalf("CreateNIC failed: %v", err)
+		opts := stack.NICOptions{Name: linkEpName}
+		if err := s.CreateNICWithOptions(nicID, channelEP, opts); err != nil {
+			t.Fatalf("CreateNICWithOptions(_, _, %+v) failed: %v", opts, err)
 		}
 		linkEPs[linkEpName] = channelEP