peer_portid: good chance it is process ID of software listening to
queue_total: current number of packets waiting in the queue
copy_mode: 0 and 1 only message only provide meta data. If 2, the
message provides a part of packet of size copy range.
copy_range: length of packet data to put in message
queue_dropped: number of packets dropped because queue was full
user_dropped: number of packets dropped because netlink message
could not be sent to userspace. If this counter is not zero, try
to increase netlink buffer size. On the application side, you will
see gap in packet id if netlink message are lost.