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authorAaron Conole <aconole@redhat.com>2019-12-04 00:34:14 +0300
committerDavid S. Miller <davem@davemloft.net>2019-12-05 03:31:15 +0300
commit95219afbb980f10934de9f23a3e199be69c5ed09 (patch)
tree462552dd01b320e2441b4fa36aa31d95b752956b /net
parent5d50aa83e2c8e91ced2cca77c198b468ca9210f4 (diff)
downloadlinux-95219afbb980f10934de9f23a3e199be69c5ed09.tar.xz
act_ct: support asymmetric conntrack
The act_ct TC module shares a common conntrack and NAT infrastructure exposed via netfilter. It's possible that a packet needs both SNAT and DNAT manipulation, due to e.g. tuple collision. Netfilter can support this because it runs through the NAT table twice - once on ingress and again after egress. The act_ct action doesn't have such capability. Like netfilter hook infrastructure, we should run through NAT twice to keep the symmetry. Fixes: b57dc7c13ea9 ("net/sched: Introduce action ct") Signed-off-by: Aaron Conole <aconole@redhat.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/act_ct.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index ae0de372b1c8..bf2d69335d4b 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -329,6 +329,7 @@ static int tcf_ct_act_nat(struct sk_buff *skb,
bool commit)
{
#if IS_ENABLED(CONFIG_NF_NAT)
+ int err;
enum nf_nat_manip_type maniptype;
if (!(ct_action & TCA_CT_ACT_NAT))
@@ -359,7 +360,17 @@ static int tcf_ct_act_nat(struct sk_buff *skb,
return NF_ACCEPT;
}
- return ct_nat_execute(skb, ct, ctinfo, range, maniptype);
+ 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);
+ }
+ return err;
#else
return NF_ACCEPT;
#endif