1 files changed, 1 insertions, 30 deletions
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 269470ed4..1ac4705af 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -32,7 +32,6 @@ type udpPacket struct {
 	senderAddress tcpip.FullAddress
 	data          buffer.VectorisedView `state:".(buffer.VectorisedView)"`
 	timestamp     int64
-	tos           uint8
 }
 
 // EndpointState represents the state of a UDP endpoint.
@@ -115,10 +114,6 @@ type endpoint struct {
 	// applied while sending packets. Defaults to 0 as on Linux.
 	sendTOS uint8
 
-	// receiveTOS determines if the incoming IPv4 TOS header field is passed
-	// as ancillary data to ControlMessages on Read.
-	receiveTOS bool
-
 	// shutdownFlags represent the current shutdown state of the endpoint.
 	shutdownFlags tcpip.ShutdownFlags
 
@@ -249,12 +244,7 @@ func (e *endpoint) Read(addr *tcpip.FullAddress) (buffer.View, tcpip.ControlMess
 		*addr = p.senderAddress
 	}
 
-	return p.data.ToView(), tcpip.ControlMessages{
-		HasTimestamp: true,
-		Timestamp:    p.timestamp,
-		HasTOS:       e.receiveTOS,
-		TOS:          p.tos,
-	}, nil
+	return p.data.ToView(), tcpip.ControlMessages{HasTimestamp: true, Timestamp: p.timestamp}, nil
 }
 
 // prepareForWrite prepares the endpoint for sending data. In particular, it
@@ -666,12 +656,6 @@ func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
 		e.sendTOS = uint8(v)
 		e.mu.Unlock()
 		return nil
-
-	case tcpip.ReceiveTOSOption:
-		e.mu.Lock()
-		e.receiveTOS = bool(v)
-		e.mu.Unlock()
-		return nil
 	}
 	return nil
 }
@@ -808,12 +792,6 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
 		e.mu.RUnlock()
 		return nil
 
-	case *tcpip.ReceiveTOSOption:
-		e.mu.RLock()
-		*o = tcpip.ReceiveTOSOption(e.receiveTOS)
-		e.mu.RUnlock()
-		return nil
-
 	default:
 		return tcpip.ErrUnknownProtocolOption
 	}
@@ -1260,13 +1238,6 @@ func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pk
 	e.rcvList.PushBack(packet)
 	e.rcvBufSize += pkt.Data.Size()
 
-	// Save any useful information from the NetworkHeader to the packet.
-	switch r.NetProto {
-	case header.IPv4ProtocolNumber:
-		// This packet has already been validated before being passed up the stack.
-		packet.tos, _ = header.IPv4(pkt.NetworkHeader).TOS()
-	}
-
 	packet.timestamp = e.stack.NowNanoseconds()
 
 	e.rcvMu.Unlock()