* Re: Socket owner problem?
[not found] ` <8d33dcd40709110045v532e062ex7f05ac3ba9386161@mail.gmail.com>
@ 2007-09-11 12:13 ` Stephen Hemminger
0 siblings, 0 replies; only message in thread
From: Stephen Hemminger @ 2007-09-11 12:13 UTC (permalink / raw)
To: Alvin Valera; +Cc: netdev
On Tue, 11 Sep 2007 15:45:29 +0800
"Alvin Valera" <alvinvalera@gmail.com> wrote:
> I am currently writing a kernel module that will apply some delay to
> incoming packets. The module is implemented using netfilter hooked
> into the NF_IP_LOCAL_IN. Once the module receives a packet of interest
> from the lower layer, it will queue the packet (in it's own queue) and
> associate a kernel timer. Once the kernel timer expires, the packet is
> then propagated up the higher layer.
Can be done already with netem and ifb already.
Netfilter is intended for only yes/no decisions, not time alteration.
> The problem happens like this:
> Once the socket is closed by the user-space application, there are
> still packets left in the module's queue. Now, the moment the kernel
> timer expires and the module propagates those packets up into the
> higher layer, the system hangs.
>
> I've been searching for ways to determine if associated socket is
> closed. This way, if my module knows that the user-space already
> closed the socket, it will not propagate the packet up. Does anyone
> have a solution for this problem?
>
> Thanks!
Please put networking discussions on netdev@vger.kernel.org
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