netdev - [PATCH] net/sched: act_ct: add nat mangle action only for NAT-conntrack

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Date:   Fri, 29 May 2020 12:07:45 +0800
From:   wenxu@...oud.cn
To:     paulb@...lanox.com
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: [PATCH] net/sched: act_ct: add nat mangle action only for NAT-conntrack

From: wenxu <wenxu@...oud.cn>

Currently add nat mangle action with comparing invert and ori tuple.
It is better to check IPS_NAT_MASK flags first to avoid non necessary
memcmp for non-NAT conntrack.

Signed-off-by: wenxu <wenxu@...oud.cn>
---
 net/sched/act_ct.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index c50a86a..d621152 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -198,18 +198,21 @@ static int tcf_ct_flow_table_add_action_nat(struct net *net,
 					    struct flow_action *action)
 {
 	const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
+	bool nat = ct->status & IPS_NAT_MASK;
 	struct nf_conntrack_tuple target;
 
 	nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
 
 	switch (tuple->src.l3num) {
 	case NFPROTO_IPV4:
-		tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
-						      action);
+		if (nat)
+			tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
+							      action);
 		break;
 	case NFPROTO_IPV6:
-		tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
-						      action);
+		if (nat)
+			tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
+							      action);
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -217,10 +220,14 @@ static int tcf_ct_flow_table_add_action_nat(struct net *net,
 
 	switch (nf_ct_protonum(ct)) {
 	case IPPROTO_TCP:
-		tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
+		if (nat)
+			tcf_ct_flow_table_add_action_nat_tcp(tuple, target,
+							     action);
 		break;
 	case IPPROTO_UDP:
-		tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
+		if (nat)
+			tcf_ct_flow_table_add_action_nat_udp(tuple, target,
+							     action);
 		break;
 	default:
 		return -EOPNOTSUPP;
-- 
1.8.3.1