Re: UDP bugs
Andi Kleen (ak@muc.de)
Sun, 13 Dec 1998 14:51:41 +0100
On Sun, Dec 13, 1998 at 02:38:57PM +0100, David S. Miller wrote:
> From: Andi Kleen <ak@muc.de>
> Date: Sun, 13 Dec 1998 14:32:23 +0100
>
> You wrote:
> >Sounds like you found a bug in Solaris, not in Linux...
>
> If the limit of 65507 Richard quoted is right then there is a off-by-one
> bug somewhere - the limit should be 65508 for UDP (65536 - 20 bytes ip header
> - 8 bytes UDP header) and 65516 for RAW sockets (and 65536 when IP_HDRINCL
> is set). If the input limit is smaller this is a bug too.
>
> Right, my current theory is that we get into trouble somewhere where
> we align some header object and add the alignment residue into the
> total length, get confused, and toss the packet because we think it is
> too big. Or it's a simple ">=" vs. ">" test off by one bug.
When I remember right Alexey's last big patch had some related changes
in ip_build_xmit.
-Andi
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