Trouble with nfq_get_timestamp

Trouble with nfq_get_timestamp

[Kristian Evensen]

Hello,

I am currently writing a small user space application where I need the
timestamp of the packets. In the callback-function, I use
nfq_get_timestamp and  provide it with the pointer to a timeval-struct
and the nfq_data sent to the callback function. However, the function
always returns -1 and failes. The get_id() and so forth works
perfectly, so I am wondering if anybody has any hints or knows how to
solve this?

I am currently using nfnetlink 0.0.39 and libnetfilter_queue 0.0.16-1,
but I have tried the newest version as well with no luck (the reason I
chose these are because they are the newest in my packet repo). My
kernel is 2.6.28.

Thanks in advance,
Kristian

Re: Trouble with nfq_get_timestamp

[Eric Leblond]

Hi,

Le dimanche 26 avril 2009 à 18:43 +0200, Kristian Evensen a écrit :
> Hello,
> 
> I am currently writing a small user space application where I need the
> timestamp of the packets. In the callback-function, I use
> nfq_get_timestamp and  provide it with the pointer to a timeval-struct
> and the nfq_data sent to the callback function. However, the function
> always returns -1 and failes. The get_id() and so forth works
> perfectly, so I am wondering if anybody has any hints or knows how to
> solve this?

Are your packet coming from localhost ? It I remember correctly
timestamp is only setup for forwarded (or input) packets.

BR,
-- 
Eric Leblond <eleblond@inl.fr>
INL: http://www.inl.fr/
NuFW: http://www.nufw.org/
EdenWall: http://www.edenwall.com/

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Re: Trouble with nfq_get_timestamp

[Kristian Evensen]

Hi,

> Are your packet coming from localhost ? It I remember correctly
> timestamp is only setup for forwarded (or input) packets.

Sorry, I forgot that parth. The packets are either on their way out
from or into the box, so I have tried bout OUTPUT and PREROUTING. I
have also tried casting the memory area after the msg_packet_hw-struct
and it seems to be zero.

-Kristian

Re: Trouble with nfq_get_timestamp

[Kristian Evensen]

Hi again,

I just found this:
http://lists.netfilter.org/pipermail/netfilter-devel/2006-February/023490.html

Here it says that the timestamp is never set, and even though it is
from 2006 I guess it still is valid.

-Kristian