code: func (m *InjectableEndpoint) WriteRawPacket(dest tcpip.Address, packet []byte) *tcpip.Error {
  	endpoint, ok := m.routes[dest]
  	if !ok {
  		return tcpip.ErrNoRoute
  	}
  	return endpoint.WriteRawPacket(dest, packet)
  }
docs: // WriteRawPacket writes outbound packets to the appropriate
  // LinkInjectableEndpoint based on the dest address.