3 files changed, 19 insertions, 21 deletions

diff --git a/pkg/tcpip/link/fdbased/endpoint.go b/pkg/tcpip/link/fdbased/endpoint.go
index 77f988b9f..adcf21371 100644
--- a/pkg/tcpip/link/fdbased/endpoint.go
+++ b/pkg/tcpip/link/fdbased/endpoint.go
@@ -165,7 +165,7 @@ type Options struct {
 //
 // Makes fd non-blocking, but does not take ownership of fd, which must remain
 // open for the lifetime of the returned endpoint.
-func New(opts *Options) (tcpip.LinkEndpointID, error) {
+func New(opts *Options) (stack.LinkEndpoint, error) {
 	caps := stack.LinkEndpointCapabilities(0)
 	if opts.RXChecksumOffload {
 		caps |= stack.CapabilityRXChecksumOffload
@@ -190,7 +190,7 @@ func New(opts *Options) (tcpip.LinkEndpointID, error) {
 	}
 
 	if len(opts.FDs) == 0 {
-		return 0, fmt.Errorf("opts.FD is empty, at least one FD must be specified")
+		return nil, fmt.Errorf("opts.FD is empty, at least one FD must be specified")
 	}
 
 	e := &endpoint{
@@ -207,12 +207,12 @@ func New(opts *Options) (tcpip.LinkEndpointID, error) {
 	for i := 0; i < len(e.fds); i++ {
 		fd := e.fds[i]
 		if err := syscall.SetNonblock(fd, true); err != nil {
-			return 0, fmt.Errorf("syscall.SetNonblock(%v) failed: %v", fd, err)
+			return nil, fmt.Errorf("syscall.SetNonblock(%v) failed: %v", fd, err)
 		}
 
 		isSocket, err := isSocketFD(fd)
 		if err != nil {
-			return 0, err
+			return nil, err
 		}
 		if isSocket {
 			if opts.GSOMaxSize != 0 {
@@ -222,12 +222,12 @@ func New(opts *Options) (tcpip.LinkEndpointID, error) {
 		}
 		inboundDispatcher, err := createInboundDispatcher(e, fd, isSocket)
 		if err != nil {
-			return 0, fmt.Errorf("createInboundDispatcher(...) = %v", err)
+			return nil, fmt.Errorf("createInboundDispatcher(...) = %v", err)
 		}
 		e.inboundDispatchers = append(e.inboundDispatchers, inboundDispatcher)
 	}
 
-	return stack.RegisterLinkEndpoint(e), nil
+	return e, nil
 }
 
 func createInboundDispatcher(e *endpoint, fd int, isSocket bool) (linkDispatcher, error) {
@@ -435,14 +435,12 @@ func (e *InjectableEndpoint) Inject(protocol tcpip.NetworkProtocolNumber, vv buf
 }
 
 // NewInjectable creates a new fd-based InjectableEndpoint.
-func NewInjectable(fd int, mtu uint32, capabilities stack.LinkEndpointCapabilities) (tcpip.LinkEndpointID, *InjectableEndpoint) {
+func NewInjectable(fd int, mtu uint32, capabilities stack.LinkEndpointCapabilities) *InjectableEndpoint {
 	syscall.SetNonblock(fd, true)
 
-	e := &InjectableEndpoint{endpoint: endpoint{
+	return &InjectableEndpoint{endpoint: endpoint{
 		fds:  []int{fd},
 		mtu:  mtu,
 		caps: capabilities,
 	}}
-
-	return stack.RegisterLinkEndpoint(e), e
 }
diff --git a/pkg/tcpip/link/loopback/loopback.go b/pkg/tcpip/link/loopback/loopback.go
index ab6a53988..e121ea1a5 100644
--- a/pkg/tcpip/link/loopback/loopback.go
+++ b/pkg/tcpip/link/loopback/loopback.go
@@ -32,8 +32,8 @@ type endpoint struct {
 
 // New creates a new loopback endpoint. This link-layer endpoint just turns
 // outbound packets into inbound packets.
-func New() tcpip.LinkEndpointID {
-	return stack.RegisterLinkEndpoint(&endpoint{})
+func New() stack.LinkEndpoint {
+	return &endpoint{}
 }
 
 // Attach implements stack.LinkEndpoint.Attach. It just saves the stack network-
diff --git a/pkg/tcpip/link/sniffer/sniffer.go b/pkg/tcpip/link/sniffer/sniffer.go
index 36c8c46fc..e7b6d7912 100644
--- a/pkg/tcpip/link/sniffer/sniffer.go
+++ b/pkg/tcpip/link/sniffer/sniffer.go
@@ -58,10 +58,10 @@ type endpoint struct {
 
 // New creates a new sniffer link-layer endpoint. It wraps around another
 // endpoint and logs packets and they traverse the endpoint.
-func New(lower tcpip.LinkEndpointID) tcpip.LinkEndpointID {
-	return stack.RegisterLinkEndpoint(&endpoint{
-		lower: stack.FindLinkEndpoint(lower),
-	})
+func New(lower stack.LinkEndpoint) stack.LinkEndpoint {
+	return &endpoint{
+		lower: lower,
+	}
 }
 
 func zoneOffset() (int32, error) {
@@ -102,15 +102,15 @@ func writePCAPHeader(w io.Writer, maxLen uint32) error {
 // snapLen is the maximum amount of a packet to be saved. Packets with a length
 // less than or equal too snapLen will be saved in their entirety. Longer
 // packets will be truncated to snapLen.
-func NewWithFile(lower tcpip.LinkEndpointID, file *os.File, snapLen uint32) (tcpip.LinkEndpointID, error) {
+func NewWithFile(lower stack.LinkEndpoint, file *os.File, snapLen uint32) (stack.LinkEndpoint, error) {
 	if err := writePCAPHeader(file, snapLen); err != nil {
-		return 0, err
+		return nil, err
 	}
-	return stack.RegisterLinkEndpoint(&endpoint{
-		lower:      stack.FindLinkEndpoint(lower),
+	return &endpoint{
+		lower:      lower,
 		file:       file,
 		maxPCAPLen: snapLen,
-	}), nil
+	}, nil
 }
 
 // DeliverNetworkPacket implements the stack.NetworkDispatcher interface. It is