On Mon, 2007-03-12 at 07:34 -0500, jamal wrote:

The point brought up on v6 extensions needs to be addressed. I thought
about it a little - and it is valid as well for ipv4 options; they will
be processed twice.
To build up on what Patrick said, I noticed a bit still available in the
bag right after skb->nf_trace that i could use to signal
"options/extensions already processed". 
If people think think this is a sane use of that very lonely bit, I will
post patches.

And the patch included demonstrates the thought (I thought i had sent it
to the list on monday; seems only to Yoshfuji). Note, blah is not a
proper name, just an emphasis.

cheers,
jama