Re: [PATCH 6/6] net: move qdisc ingress filtering on top of netfilter ingress hooks

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On Wed, Apr 29, 2015 at 02:53:58PM -0700, Cong Wang wrote:
> On Wed, Apr 29, 2015 at 11:53 AM, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
> > diff --git a/net/sched/Kconfig b/net/sched/Kconfig
> > index 2274e72..23b57da 100644
> > --- a/net/sched/Kconfig
> > +++ b/net/sched/Kconfig
> > @@ -312,6 +312,7 @@ config NET_SCH_PIE
> >  config NET_SCH_INGRESS
> >         tristate "Ingress Qdisc"
> >         depends on NET_CLS_ACT
> > +       select NETFILTER_INGRESS
> >         ---help---
> >           Say Y here if you want to use classifiers for incoming packets.
> >           If unsure, say Y.
> 
> 
> So now it impossible to compile ingress Qdics without netfilters...
> 
> (I know you moved them into net/core/, but still they are netfilter API's.)

This is only one single file that only contains the very basic hook
infrastructure, this does not depend on the layer 3.

> Why do we have to mix different layers? IOW, why not just keep TC at L2
> and netfilters at L3 even just w.r.t. API?

I think that used to be true in the iptables days... The nftables
infrastructure is flexible and extensible enough to satisfy the needs
of other network layers.
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