Tarun Khanna <tkhanna@xxxxxxxxxx> wrote:
On 02/27/2017 05:12 PM, Florian Westphal wrote:
Tarun Khanna <tkhanna@xxxxxxxxxx> 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.
No, there is no such feature at the moment.
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?
Its your only option right now. If you need a periodic update feature
we'll need to think about how to best make this.
We now have a periodic gc worker in conntrack so we could probably do
this without re-adding a per-conntrack timer.
Thank you. The current way of polling works for me. I was thinking about
it and it doesn't really make a difference if the library sends me
updates periodically or if I check for them because in both cases I'll
need to setup some event on epoll (either a timer or the netfilter fd).
So, functionally both would be the same. Thanks again for your help.
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