net/sched: act_ct: add nat mangle action only for NAT-conntrack

Currently add nat mangle action with comparing invert and orig 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@ucloud.cn>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 1a76639..2057735 100644 (file)
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -199,6 +199,9 @@ static int tcf_ct_flow_table_add_action_nat(struct net *net,
        const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
        struct nf_conntrack_tuple target;
 
+       if (!(ct->status & IPS_NAT_MASK))
+               return 0;
+
        nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
 
        switch (tuple->src.l3num) {