netdev - Re: [PATCH v6.1] netfilter: nf_tables: use timestamp to check for set element timeout

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Date: Thu, 20 Jun 2024 11:49:41 -0700
From: Kuntal Nayak <kuntal.nayak@...adcom.com>
To: Pablo Neira Ayuso <pablo@...filter.org>
Cc: stable@...r.kernel.org, gregkh@...uxfoundation.org, 
	ajay.kaher@...adcom.com, alexey.makhalov@...adcom.com, 
	vasavi.sirnapalli@...adcom.com, kadlec@...filter.org, fw@...len.de, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	netfilter-devel@...r.kernel.org, coreteam@...filter.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6.1] netfilter: nf_tables: use timestamp to check for set
 element timeout

Hi Pablo,

Thank you for the update and reviewing the patch. We will wait for
your patch to be applied to the LTS and then consume the latest 6.1
kernel.

------



Best regards,

Kuntal

On Wed, Jun 12, 2024 at 6:15 AM Pablo Neira Ayuso <pablo@...filter.org> wrote:
>
> Hi,
>
> Thanks for your patch.
>
> rbtree GC chunk is not correct though. In 6.1, GC runs via workqueue,
> so the cached timestamp cannot be used in such case.
>
> Another possibility is to pull in the patch dependency to run GC
> synchronously.
>
> I am preparing a batch of updates for -stable, let me pick up on your
> patch.
>
> Thanks.
>
> On Fri, Jun 07, 2024 at 04:01:46PM -0700, Kuntal Nayak wrote:
> > diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
> > index 5bf5572e9..c4c92192c 100644
> > --- a/net/netfilter/nft_set_rbtree.c
> > +++ b/net/netfilter/nft_set_rbtree.c
> [...]
> > @@ -622,12 +624,14 @@ static void nft_rbtree_gc(struct work_struct *work)
> >       struct nft_set *set;
> >       unsigned int gc_seq;
> >       struct net *net;
> > +     u64 tstamp;
> >
> >       priv = container_of(work, struct nft_rbtree, gc_work.work);
> >       set  = nft_set_container_of(priv);
> >       net  = read_pnet(&set->net);
> >       nft_net = nft_pernet(net);
> >       gc_seq  = READ_ONCE(nft_net->gc_seq);
> > +     tstamp = nft_net_tstamp(net);
> >
> >       if (nft_set_gc_is_pending(set))
> >               goto done;
> > @@ -659,7 +663,7 @@ static void nft_rbtree_gc(struct work_struct *work)
> >                       rbe_end = rbe;
> >                       continue;
> >               }
> > -             if (!nft_set_elem_expired(&rbe->ext))
> > +             if (!__nft_set_elem_expired(&rbe->ext, tstamp))
> >                       continue;
> >
> >               nft_set_elem_dead(&rbe->ext);
> > --
> > 2.39.3
> >