Add LinkEndpoint.WriteRawPacket with stubs

...returning unsupported errors.

PiperOrigin-RevId: 393388991

2 files changed, 12 insertions, 0 deletions

diff --git a/pkg/tcpip/stack/forwarding_test.go b/pkg/tcpip/stack/forwarding_test.go
index 72f66441f..ccb69393b 100644
--- a/pkg/tcpip/stack/forwarding_test.go
+++ b/pkg/tcpip/stack/forwarding_test.go
@@ -342,6 +342,10 @@ func (e *fwdTestLinkEndpoint) WritePackets(r RouteInfo, pkts PacketBufferList, p
 	return n, nil
 }
 
+func (*fwdTestLinkEndpoint) WriteRawPacket(*PacketBuffer) tcpip.Error {
+	return &tcpip.ErrNotSupported{}
+}
+
 // Wait implements stack.LinkEndpoint.Wait.
 func (*fwdTestLinkEndpoint) Wait() {}
 
diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go
index dfe2c886f..57b3348b2 100644
--- a/pkg/tcpip/stack/registration.go
+++ b/pkg/tcpip/stack/registration.go
@@ -846,6 +846,14 @@ type LinkEndpoint interface {
 	// offload is enabled. If it will be used for something else, syscall filters
 	// may need to be updated.
 	WritePackets(RouteInfo, PacketBufferList, tcpip.NetworkProtocolNumber) (int, tcpip.Error)
+
+	// WriteRawPacket writes a packet directly to the link.
+	//
+	// If the link-layer has its own header, the payload must already include the
+	// header.
+	//
+	// WriteRawPacket takes ownership of the packet.
+	WriteRawPacket(*PacketBuffer) tcpip.Error
 }
 
 // InjectableLinkEndpoint is a LinkEndpoint where inbound packets are