From: Marcelo Ricardo Leitner marcelo.leitner@gmail.com
[ Upstream commit 13c62f5371e3eb4fc3400cfa26e64ca75f888008 ]
This this the counterpart of 8aa7b526dc0b ("openvswitch: handle DNAT tuple collision") for act_ct. From that commit changelog:
""" With multiple DNAT rules it's possible that after destination translation the resulting tuples collide.
...
Netfilter handles this case by allocating a null binding for SNAT at egress by default. Perform the same operation in openvswitch for DNAT if no explicit SNAT is requested by the user and allocate a null binding for SNAT for packets in the "original" direction. """
Fixes: 95219afbb980 ("act_ct: support asymmetric conntrack") Signed-off-by: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/sched/act_ct.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c index 315a5b2f3add..7ef074c6dd16 100644 --- a/net/sched/act_ct.c +++ b/net/sched/act_ct.c @@ -900,14 +900,19 @@ static int tcf_ct_act_nat(struct sk_buff *skb, }
err = ct_nat_execute(skb, ct, ctinfo, range, maniptype); - if (err == NF_ACCEPT && - ct->status & IPS_SRC_NAT && ct->status & IPS_DST_NAT) { - if (maniptype == NF_NAT_MANIP_SRC) - maniptype = NF_NAT_MANIP_DST; - else - maniptype = NF_NAT_MANIP_SRC; - - err = ct_nat_execute(skb, ct, ctinfo, range, maniptype); + if (err == NF_ACCEPT && ct->status & IPS_DST_NAT) { + if (ct->status & IPS_SRC_NAT) { + if (maniptype == NF_NAT_MANIP_SRC) + maniptype = NF_NAT_MANIP_DST; + else + maniptype = NF_NAT_MANIP_SRC; + + err = ct_nat_execute(skb, ct, ctinfo, range, + maniptype); + } else if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) { + err = ct_nat_execute(skb, ct, ctinfo, NULL, + NF_NAT_MANIP_SRC); + } } return err; #else