[Click] Seg fault in IPFilter

[Beyers Cronje]

Hi Alastair,

To use IPFilter input packets must have their IP header annotation set, so
use CheckIPHeader or MarkIPHeader before input to IPFilter.

Cheers

Beyers


On 4/5/06, Alastair McKinley <amckinley03 at qub.ac.uk> wrote:
>
> Hi everyone,
>
> Im getting a reproducible seg fault in IPFilter when I run a particular
> configuration at userlevel.
> A similar config at kernel level does not cause any problems.
>
> The configuration is as follows:
>
>
> *******************************************************************************
> FromDevice(eth0, PROMISC true) -> Tee(2);
>
> Tee[0] -> IPFilter(dst tcp port 24,         /* To drop SSH packets on
> port 24 */
>                                -);
>
> Tee[1] -> ToHost(eth0);
>
> IPFilter[0] -> Discard();
>
> IPFilter[1] -> Queue(32); -> Timedsink(0.1);
>
> *******************************************************************************
>
>
> When I run this under gdb at userlevel I get this:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x080a1156 in IPFilter::push (this=0x81a73e8, p=0x81ac040)
>     at ../elements/ip/ipfilter.cc:1215
> 1215          data = *(const unsigned *)(neth_data + off);
>
>
> Does anyone know why this might be?  Is there some more debugging I can
> do here to find the problem?
> Im running normally at kernel level, but this problem is stopping me
> from debugging at userlevel.
>
> Best regards,
>
> Alastair
>
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