Method DeepCopyForForwarding

pkg/tcpip/stack/packet_buffer.go:444–472

DeepCopyForForwarding creates a deep copy of the packet buffer for forwarding. The returned packet buffer will have the network and transport headers set if the original packet buffer did.

(reservedHeaderBytes int)

// The returned packet buffer will have the network and transport headers
// set if the original packet buffer did.
func (pk *PacketBuffer) DeepCopyForForwarding(reservedHeaderBytes int) *PacketBuffer {
	payload := BufferSince(pk.NetworkHeader())
	defer payload.Release()
	newPk := NewPacketBuffer(PacketBufferOptions{
		ReserveHeaderBytes: reservedHeaderBytes,
		Payload:            payload.DeepClone(),
		IsForwardedPacket:  true,
	})

	{
		consumeBytes := len(pk.NetworkHeader().Slice())
		if _, consumed := newPk.NetworkHeader().Consume(consumeBytes); !consumed {
			panic(fmt.Sprintf("expected to consume network header %d bytes from new packet", consumeBytes))
		}
		newPk.NetworkProtocolNumber = pk.NetworkProtocolNumber
	}

	{
		consumeBytes := len(pk.TransportHeader().Slice())
		if _, consumed := newPk.TransportHeader().Consume(consumeBytes); !consumed {
			panic(fmt.Sprintf("expected to consume transport header %d bytes from new packet", consumeBytes))
		}
		newPk.TransportProtocolNumber = pk.TransportProtocolNumber
	}

	newPk.tuple = pk.tuple

	return newPk
}

// IsConnTrackConfigured returns whether connection tracking is configured for this packet.
func (pk *PacketBuffer) IsConnTrackConfigured() bool {