Re: [Openlldp-users] Question about the bpf framer

[Terry S. <ter...@gm...>]

Hi Tom,

Yes, you are correct.

That code is an attempt to remove the BPF header, which on the 32-bit
systems I've tested is 18 bytes, including 32-bit versions of FreeBSD.

I never quite understood how the BPF layer worked with regards to that, but
it sounds like there's a difference in the header on 64-bit systems?

I'm happy to look into this for you if you want, or if you have a patch or
some knowledge that could help us determine what's going on that would be
great too.

- Terry

On Jan 16, 2008 5:01 PM, Tom Judge <to...@to...> wrote:

> Hi,
>
> I have a quick question about the bpf framer's read_lldp function.
> Could someone please explain why 18 bytes are trimmed from the begining
> of the frame that is read?
>
> The reason that I ask is I am trying to get openlldp to work on a
> FreeBSD 6.2 amd64 system (plugged into the same switch as a i386 system)
>  And the amd64 system seems to be printing/receiving gibberish.
>
> After having a quick skim over the bpf documentation/source it would
> seem that the function is trying to drop the bpf_hdr off the beginning
> of the packet.  Is this a correct assumption?
>
> Thanks
>
> Tom
>
>
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