Re: per flow stats collection using libnetfilter_conntrack

[Tarun Khanna <tkhanna@akamai.com>]

On 02/27/2017 05:12 PM, Florian Westphal wrote:
> Tarun Khanna <tkhanna@akamai.com> wrote:
>> Is it possible to register for callbacks so that a user application is
>> updated on a regular basis when the packet or bytes counts change for flows?
> No, update to packet/byte count doesn't trigger an event (it would
> trigger too often).

I was hoping if there was an option to set a timeout, so that an update 
would trigger every 5 seconds for flows where the counters have changed.

>
>> I can poll the stats using something similar to "conntrack -L". However, I
>> was wondering if it's possible to be notified regularly on updates.
> No.  What semantics would you be interested in?
>
> Dumping is quite fast, whats the problem you need to solve?
I have an application that needs to keep track of per flow stats for all 
tcp flows destined to port 80. The best way I have found so far is to 
call nfct_query regularly and to go through each flow returned to 
retrieve the counters. Would that be the best way to do it?

Thank you for your assistance.