net/sched: act_ct: Offload connections with commit action

Currently established connections are not offloaded if the filter has a
"ct commit" action. This behavior will not offload connections of the
following scenario:

$ tc_filter add dev $DEV ingress protocol ip prio 1 flower \
  ct_state -trk \
  action ct commit action goto chain 1

$ tc_filter add dev $DEV ingress protocol ip chain 1 prio 1 flower \
  action mirred egress redirect dev $DEV2

$ tc_filter add dev $DEV2 ingress protocol ip prio 1 flower \
  action ct commit action goto chain 1

$ tc_filter add dev $DEV2 ingress protocol ip prio 1 chain 1 flower \
  ct_state +trk+est \
  action mirred egress redirect dev $DEV

Offload established connections, regardless of the commit flag.

Fixes: 46475bb20f4b ("net/sched: act_ct: Software offload of established flows")
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Paul Blakey <paulb@nvidia.com>
Link: https://lore.kernel.org/r/1622029449-27060-1-git-send-email-paulb@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index ec7a1c4..b1473a1 100644 (file)
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -984,7 +984,7 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
         */
        cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
        if (!cached) {
-               if (!commit && tcf_ct_flow_table_lookup(p, skb, family)) {
+               if (tcf_ct_flow_table_lookup(p, skb, family)) {
                        skip_add = true;
                        goto do_nat;
                }
@@ -1022,10 +1022,11 @@ do_nat:
                 * even if the connection is already confirmed.
                 */
                nf_conntrack_confirm(skb);
-       } else if (!skip_add) {
-               tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
        }
 
+       if (!skip_add)
+               tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
+
 out_push:
        skb_push_rcsum(skb, nh_ofs);