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Re: [PATCHES] Fixes for daq_nfq
From: Russ Combs <rcombs () sourcefire com>
Date: Thu, 9 Dec 2010 12:33:19 -0500

Have you tested with DAQ 0.3?

On Tue, Nov 2, 2010 at 4:31 PM, Kelvie Wong <kwong () wurldtech com> wrote:

 On November 2, 2010 01:08:36 pm Russ Combs wrote:

Too bad NFQ is so buggy.  Any idea when this fails and when not?  Is it

certain traffic?



I am not quite sure. Mainly I have been testing this with a nmap scan of
the TCP ports; this also happens for a storm of TCP packets as well. I
hadn't tested this against other types of traffic, prior to apply this
patch.

If this happens always or never, for a given run of Snort, the patch is

reasonable.  If it is every other packet, we may be better off just
adding

the smallest delta possible to the timestamp to keep them sequenced.

For the type of traffic I had tested (I placed printf statements inside
there), it was every single packet, and not just some of them.

 > The freeze scenario should be eliminated with daq 0.3.  Can you verify

that?

I do not have a test bench set up right now, but I may be able to get a few
tests in later after I have exhausted my other committments.



The early exit is a little different.  Does this indicate a permanent

error?  Can you elaborate on the conditions?



The errors were presumbed permanent and Snort exits to avoid consuming

excessive resources.

I have attached a packet capture that can reproduce it every single time on
one of our hardware configurations -- I have not tested it elsewhere.
Packets are still queued normally from NFQ after nfq_handle_packet returns
an error.

Snort exits at around the 1000th packet.

As I have mentioned earlier, I don't have a test environment set up
currently (nor the time to set it up), so I'm terribly sorry I can't be of
more help right now.

--

Kelvie Wong

Software Developer

Wurldtech Security Technologies Inc.

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