netdev - Re: [PATCH 5/7] net: add netfilter ingress hook

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Message-ID: <20150410200808.GA5968@salvia>
Date:	Fri, 10 Apr 2015 22:08:08 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	netfilter-devel@...r.kernel.org, kaber@...sh.net,
	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 5/7] net: add netfilter ingress hook

On Fri, Apr 10, 2015 at 02:21:20PM +0100, Thomas Graf wrote:
> On 04/10/15 at 02:15pm, Pablo Neira Ayuso wrote:
> >  static int __netif_receive_skb_ingress(struct sk_buff *skb, bool pfmemalloc,
> >  				       struct net_device *orig_dev)
> >  {
> > @@ -3772,6 +3800,8 @@ skip_taps:
> >  	if (!skb)
> >  		return NET_RX_DROP;
> >  #endif
> > +	if (nf_hook_ingress_active(skb))
> > +		return nf_hook_ingress(skb, pt_prev, orig_dev, pfmemalloc);
> >  
> >  	return __netif_receive_skb_finish(skb, pfmemalloc, pt_prev, orig_dev);
> >  }
> 
> I would favour if we avoid for every subsystem to manage its ingress
> filter pointers in net_device. From a net_device perspective, all it
> takes is a single pointer which points to a single linked list of
> filters which need to be run through. These entries could represent
> an ingress qdisc or a netfilter chain or something else (L2 ingress
> qdisc?).
> 
> I know it's only 24 bytes but I'm trying hard to keep net_device below
> 2K.

Then it would be probably good to investigate if we can come up with
some extension infrastructure for net_device (I think Patrick already
suggested this during netdev0.1), so things are allocated based on
available features.
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