netdev - [PATCH net] net/sched: act_ct: Offload connections with commit action

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Date:   Wed, 26 May 2021 14:44:09 +0300
From:   Paul Blakey <paulb@...dia.com>
To:     Paul Blakey <paulb@...dia.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Cong Wang <xiyou.wangcong@...il.com>, <netdev@...r.kernel.org>
CC:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Oz Shlomo <ozsh@...dia.com>, Roi Dayan <roid@...dia.com>,
        Jiri Pirko <jiri@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Vlad Buslov <vladbu@...dia.com>
Subject: [PATCH net] 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@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Signed-off-by: Paul Blakey <paulb@...dia.com>
---
 net/sched/act_ct.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index ec7a1c438df9..b1473a1aecdd 100644
--- 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 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
 		 * 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);
 
-- 
2.30.1