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[lwip-users] LwIP help needed
From: |
Chris Williams |
Subject: |
[lwip-users] LwIP help needed |
Date: |
Tue, 16 Dec 2008 15:45:21 +0000 |
In message <address@hidden>
, Abhinay Patil <address@hidden> writes
>
> Hello,
> I am in need of some support in using lwIP for my application. I
> hope you will be able to reply on the queries, or atleast guide me
> to the proper channel for such queries (if this is not the one!).
> Thanks in advance.
> Here's what I intend to do in my application:
> I have a DSP processor with 2 ethernet ports and running lwIP
> stack. One port is to receive the incoming traffic and other port
> for outgoing traffic. The processor is expected to either filter or
> pass through the incoming traffic to the output port based on
> certain conditions. For this, the DSP should receive all the IP
> packets coming to the input port, regardless of the fact whether
> those packets were addressed to that port or not. The DSP will then
> analyse the packets and use some proprietary conditions to
> determine whether that packet has to be processed or just passed on
> to the output port. While passing on the packets to the output
> port, the DSP should ensure that the packets are in exactly the
> same format as they were when they entered the input port (i.e. the
> original source address and other control data etc..)
> I hope I have explained my application clearly. I need your help in
> understanding where exactly to modify the lwIP stack to achieve
> this. (Just for your information, I already have a project with 2
> ethernet ports running under lwIP. I need your help in the packet
> handling and forwarding part of the application.)
>
If you want to do packet filtering you should look at bpf filters
(Google bpf filter). These provide a fast and consistent way of
filtering packets quickly. You feed packets straight from the ethernet
driver etc. You would not need lwip.
Hope that helps.
Chris.
> Thanks and regards,
> Abhinay
>_______________________________________________
>lwip-users mailing list
>address@hidden
>http://lists.nongnu.org/mailman/listinfo/lwip-users
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