On Fri, 18 Feb 2022, Pablo Neira Ayuso wrote:
> On Fri, Feb 18, 2022 at 12:55:07AM +0100, Pablo Neira Ayuso wrote:
> > On Thu, Feb 17, 2022 at 08:27:08PM -0300, Marcelo Ricardo Leitner wrote:
> > > On Thu, Feb 17, 2022 at 02:55:27PM +0100, Pablo Neira Ayuso wrote:
> > > > On Thu, Feb 17, 2022 at 11:34:24AM +0200, Paul Blakey wrote:
> > > > > After cited commit optimizted hw insertion, flow table entries are
> > > > > populated with ifindex information which was intended to only be used
> > > > > for HW offload. This tuple ifindex is hashed in the flow table key, so
> > > > > it must be filled for lookup to be successful. But tuple ifindex is
> > > > > only
> > > > > relevant for the netfilter flowtables (nft), so it's not filled in
> > > > > act_ct flow table lookup, resulting in lookup failure, and no SW
> > > > > offload and no offload teardown for TCP connection FIN/RST packets.
> > > > >
> > > > > To fix this, allow flow tables that don't hash the ifindex.
> > > > > Netfilter flow tables will keep using ifindex for a more specific
> > > > > offload, while act_ct will not.
> > > >
> > > > Using iif == zero should be enough to specify not set?
> > >
> > > You mean, when searching, if search input iif == zero, to simply not
> > > check it? That seems dangerous somehow.
> >
> > dev_new_index() does not allocate ifindex as zero.
> >
> > Anyway, @Paul: could you add a tc_ifidx field instead in the union
> > right after __hash instead to fix 9795ded7f924?
>
> I mean this incomplete patch below:
>
> diff --git a/include/net/netfilter/nf_flow_table.h
> b/include/net/netfilter/nf_flow_table.h
> index a3647fadf1cc..d4fa4f716f68 100644
> --- a/include/net/netfilter/nf_flow_table.h
> +++ b/include/net/netfilter/nf_flow_table.h
> @@ -142,6 +142,7 @@ struct flow_offload_tuple {
> u8 h_source[ETH_ALEN];
> u8 h_dest[ETH_ALEN];
> } out;
> + u32 tc_ifidx;
> };
> };
>
> You will need to update nf_flow_rule_match() to set key->meta.ingress_ifindex
> to
> use tc_ifidx if it is set to non-zero value.
>
I understand how it could fix the original issue, but I don't think this
is better, because it makes tuple less generic. What you suggested with
using 0 to avoid needing the new flag is good enough for me, and is
cleaner in my opinion.
I'll send the == 0 one as V2 for chance you agree, and if you want to
change to this, I won't mind sending it as V3.
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