tcpdump mailing list archives

Re: Signed/Unsigned Frag Offset Issue?


From: Guy Harris <guy () alum mit edu>
Date: Wed, 10 Dec 2003 02:32:45 -0800

On Tue, Dec 09, 2003 at 04:15:40PM -0500, Joshua Krage wrote:
I can't reconcile my results with Guy's bug followup that the bpf driver's
he has checked treated both the accumulator and constant as unsigned.

The BPF interpreters won't give you the right answer if the code handed
to them asks them to give the wrong answer.

What does

        tcpdump -d 'ip[6:2] & 0x1fff > 0'

print?
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