Get received / dropped statistics

def get_stats(self):
        """Get received / dropped statistics"""

        try:
            ret = fcntl.ioctl(self.ins, BIOCGSTATS, struct.pack("2I", 0, 0))
            return struct.unpack("2I", ret)
        except IOError:
            warning("Unable to get stats from BPF !")
            return (None, None)