[Click] Userlevel versus Linuxmodule

[Beyers Cronje]

Hi Italo,

By default in userlevel using FromDevice the kernel will also process the
packets. However there is a workaround using the following FromDevice config
parameter:

*SNIFFER*Boolean. Specifies whether
FromDevice<http://read.cs.ucla.edu/click/elements/fromdevice> should
run in sniffer mode. In non-sniffer mode,
FromDevice<http://read.cs.ucla.edu/click/elements/fromdevice>
 installs KernelFilter
<http://read.cs.ucla.edu/click/elements/kernelfilter> filtering
rules to block the kernel from handling any packets arriving on device
DEVNAME. Default is true (sniffer mode).

So setting SNIFFER to false will block the kernel from handling packets as
well.

Beyers


On Fri, Aug 20, 2010 at 3:20 AM, Italo Valcy <italo at dcc.ufba.br> wrote:

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>
> Hi Guys,
>
> I'm starting to use Click and I have a simple doubt: When I use Click in
> userlevel the packages are still handled by the Linux kernel? I could
> not find this information in the documentation, but only in the click
> examples:
>
> - ---------  click-1.8.0/conf/test-device.click -----------------
> ....
> // If you run this inside the kernel, your kernel's ordinary IP stack
> // will stop getting packets from eth0.
> ...
> - ---------------------------------------------------------------
>
> In other words, when I use Click in userlevel and I run 'click
> ./conf/test-device.click' should my IP stack stop to getting packages
> from the interface?
>
> Sorry if anyone already ask for this here, but I'm new in this mailing
> list. Please let me know about.
>
> Thanks for any help.
>
> Kind Regards, Italo.
>
>
> - --
> Saudações,
>
> Italo Valcy :: http://wiki.dcc.ufba.br/~ItaloValcy
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