Re: [lwip-users] ip_input

[Sathya Thammanur]

Hi Adrian,
In order to modify the lwIP source (ip.c) file, do the following :
- Create "sw_services"  directory in your project area
- Copy $XILINX_EDK/sw/lib/lwip_v2_00_a into the above area
- Start modifying the sources in this area

This will let LibGen take the lwip sources from this area and hence
any change here would be reflected.

Sathya

On 5/10/05, Pepe Prisas <address@hidden> wrote:
> Hi there,
> 
> I hope this is not a far too simple question for you since I'm a newbie
> with lwIP and with FPGA programming. Any advice would be really appreciated.
> 
> I'm actually working on a EDK network project for use on a Virtex-II Pro
> FPGA using Micoblaze soft-core. This project intends to read every
> incoming packet/frame on the network to be analyzed later on, something
> like a sniffer. I'm using EDK 6.3 with the lwIP stack.
> 
> I am able to initialize the lwIP TCP/IP stack correctly with the lwIP
> initalization routines: sys_init(); mem_init(); memp_init();
> pbuf_init(); netif_init(); tcp_init();
> I can also activate the network interface correctly with netif_add and
> netif_set_default.
> I have been able to run other lwIP applications on my development card
> like the application note "TCP/IP on Virtex-II Pro Devices Using lwIP"
> that work 100% correctly.
> 
> My idea was to modify the ip_input function included in ip.c.
> This function is the one in charge of reading every incoming packet and
> checking headers, packet length, etc.
> But I think this is not the correct way to do it since any changes that
> I make on this file do not seem to apply. I assume that once the lwIP
> files and headers are generated with LibGen these can not be changed.
> 
> Some TCP level functions are used to register callback functions which
> can be included in the project code such as tcp_arg, tcp_bind,...The
> callback functions then can be programmed in the project to work on a
> TCP level, but my intention is to capture every packet, not only those
> from a certain TCP connection
> 
> Is there any way of registering callback functions on IP level? How can
> I modify ip_input function so that the changes can apply on my project?
> Any advice?
> 
> Sorry if I haven't explained myself correctly but English isn't my first
> language.
> 
> Thanks in advance.
> 
> Adrian
> 
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