Re: kernel stack trace using conntrack

Pablo Neira Ayuso wrote:

Patrick McHardy wrote:

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Pablo, please let me know whether you want me to apply this.

ctnetlink_change_helper() also calls nf_ct_ext_add() for conntracks that
are confirmed (in case of a helper update for an existing conntrack).
That would also trigger the assertion. If we want to support helper
assignation via ctnetlink for existing conntracks, we will need to add
locking to the conntrack extension infrastructure to avoid races.

I don't see a clear solution for this yet.

I see, this is indeed a problem. Since the helper is known at the
first event, we could restrict this to only allow manual assignment
for newly created conntracks. Most helpers probably can't properly
cope with connections not seen from the beginning anyways.

Indeed, changing the helper in the middle of the road doesn't make too
much sense to me either. I can send you a patch for this along today,
I'll find some spare time to do it.

Great, thanks Pablo.