[Click] Basic problem of how to transfer packet to kernel under user-level click

[Beyers Cronje]

Hi Zhang,

In userlevel click all packets are processed by the Linux kernel, with click
sitting on a 'higher' level than the kernel, so there is no need to forward
local destined packets to linux as linux already received and processed
these packets. Userlevel FromDevice receives packets from the kernel either
via raw packet socket or via pcap library.

Click kernel module works differently as all packets are intercepted BEFORE
they reach the linux kernel networking stack. For this reason it's required
to forward local destined packet to linux for processing.

Hope this helps.

Beyers Cronje

On 4/14/06, Zhang Shidong <zshidong at gmail.com> wrote:
>
> hi,
>
> On the configuration of Click Router, here is suggestion:
>
> if you are using user level click, thenyou should use:
> "toh::Print(toh)->Discard"
> instead of 'toh :: ToHost', which is meant only for kernel click.
>
> My question is: If the Local delivery packet are all Discarded, how can my
> linux server receive the packets which destination to  the  local system?
>
> Thanks!
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