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Re: in_cksum problems
On Mon, 21 Apr 2008, David Young wrote:
> On Mon, Apr 21, 2008 at 10:57:58AM +0200, Jaap Boender wrote:
> > > Do you use any packet filters?
> > I did have ipfilter and ipnat enabled; when I disable them both, the problem
> > seems to go away (IPv6-enabled kernel boots normally).
> ip_input() calls m_pullup() to make the IP header contiguous in the
> first buffer of the mbuf chain, but it calls packet filters through
> pfil(9) afterward. Perhaps a packet filter is returning an mbuf chain
> with a short mbuf at the front? A printf after the pfil(9) hook may
> illuminate the problem.
There were some similar messages about this back in february, it seems
that pfil_run_hooks() was modifying the mbuf chain and leaving it without
the complete header addressable (first mbuf empty). I wrote:
> The only places I see hooks being added are in:
> I don't really know what the hooks are supposed to be doing, but some of
> them use m_makewriteable() which does not guarantee that data is left
perhaps that would be of use to somebody looking into it?
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