On Tue, 4 Jan 2022, Jakub Kicinski wrote:
> On Tue, 4 Jan 2022 10:28:21 +0200 Paul Blakey wrote:
> > Netfilter conntrack maintains NAT flags per connection indicating
> > whether NAT was configured for the connection. Openvswitch maintains
> > NAT flags on the per packet flow key ct_state field, indicating
> > whether NAT was actually executed on the packet.
> >
> > When a packet misses from tc to ovs the conntrack NAT flags are set.
> > However, NAT was not necessarily executed on the packet because the
> > connection's state might still be in NEW state. As such, openvswitch wrongly
> > assumes that NAT was executed and sets an incorrect flow key NAT flags.
> >
> > Fix this, by flagging to openvswitch which NAT was actually done in
> > act_ct via tc_skb_ext and tc_skb_cb to the openvswitch module, so
> > the packet flow key NAT flags will be correctly set.
>
> Fixes ?
I wasn't sure which patches to blame, I guess the bug was there from the
introduction of action ct in tc, so I'll blame that.
>
> > Signed-off-by: Paul Blakey <[email protected]>
>
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 4507d77d6941..bab45a009310 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -287,7 +287,9 @@ struct tc_skb_ext {
> > __u32 chain;
> > __u16 mru;
> > __u16 zone;
> > - bool post_ct;
> > + bool post_ct:1;
> > + bool post_ct_snat:1;
> > + bool post_ct_dnat:1;
>
> single bit bool variables seem weird, use a unsigned int type, like u8.
>
> > };
> > #endif
> >
> > diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
> > index 9e71691c491b..a171dfa91910 100644
> > --- a/include/net/pkt_sched.h
> > +++ b/include/net/pkt_sched.h
> > @@ -197,7 +197,9 @@ struct tc_skb_cb {
> > struct qdisc_skb_cb qdisc_cb;
> >
> > u16 mru;
> > - bool post_ct;
> > + bool post_ct: 1;
>
> extra space
Will remove, and send v2.
>
> > + bool post_ct_snat:1;
> > + bool post_ct_dnat:1;
> > u16 zone; /* Only valid if post_ct = true */
> > };
>
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