Max,
I have applied the patch, seems to be working fine, thank you.
Vadym Chepkov
----- Original Message -----
From: "Max Laier" <[EMAIL PROTECTED]>
To: <freebsd-pf@freebsd.org>
Cc: "Hugo Koji Kobayashi" <[EMAIL PROTECTED]>
Sent: Friday, June 29, 2007 9:04 AM
Subject: Re: udp fragmentation
On Friday 29 June 2007, Max Laier wrote:
On Friday 29 June 2007, Pyun YongHyeon wrote:
> On Thu, Jun 28, 2007 at 10:56:01PM +0200, Max Laier wrote:
> > > > The only thing common about your setup seems to be the bge(4)
> > > > NIC. Can you try disabling hardware checksumming (ifconfig
> > > > -txcsum -rxcsum)? My test is over a hardware checksumming
> > > > fxp(4) card, though.
> > >
> > > Yes, this eliminated the issue. Bug in bge driver?
> >
> > Kind of - the driver claims to have done UDP checksum testing on
> > the fragment (which is impossible). The attached patch should fix
> > the issue for bge(4) and any other similar NIC.
>
> I guess bge(4) has Rx checksum offload bug on fragmented UDP
> datagrams. Since other hardwares with checksum offload capability
> does not show this issue, it could be related with UDP pseudo header
> calculation. How about disabling UDP pseudo header calculation?
>
> I don't have bge(4) hardwares so the patch is just guess work.
In fact it doesn't seem broken at all, we would just have to do
something along the lines of ip_input.c::ip_reass() (line 1001 ff):
...
Have to ponder a bit, if this is easily possible in pf's reassembly.
Works - see attached.
Does anyone know of a tool to generate nasty fragments to really test
this? Reordered / overlapping / etc. ?
--
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