Re: [PATCH nf-next 3/6] netfilter: nf_tables: disable old tracing if listener is present

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Patrick McHardy <kaber@xxxxxxxxx> wrote:
> > True, good point.  In that case I would propose to get rid of "packet"
> > message type completely.
> > 
> > Instead we'd include all the info that we currently have in "packet"
> > (i.e. vlanid, headers) on the first message type fired on each nft_do_chain()
> > invocation.
> > 
> > We can also move IIF/OIF info to this 'initial' message
> > (which might be of any type depending on the ruleset, due to POLICY
> >  type we would however always send at least one, even if there are no
> >  matches).
> > 
> > The price to be paid would be a new variable that we have to keep
> > on-stack to know when we can elide the extra packet data.
> > 
> > Does that sound reasonable?
> 
> Sure, but is that really easier than including an unconditional (well,
> skb->nf_trace == 1) call to nf_tables_trace_notify() before entering
> the main loop? I don't see anything wrong the the packet message itself,
> just thinking it might be useful to emit one more in this specific
> spot.

Its not easier, but it will keep the number of messages lower.

AFAIU with nf_tables_trace_notify() for each nft_do_chain() we will
have one more message for each table/hook combo...  Hmm...

I I'll see how painful the extra test for 'i have sent packet data
for this nft_do_chain invocation' is, if its too complicated
I'll move the nf_tables_trace_notify from nft_meta to nft_do_chain.

Let me know in case you spot a problem with that rationale.

Thanks!
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