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| author | Aaron Conole <aconole@redhat.com> | 2019-12-03 16:34:13 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-04 16:31:15 -0800 |
| commit | 5d50aa83e2c8e91ced2cca77c198b468ca9210f4 (patch) | |
| tree | 1a6425bbfb8a9175b68b9239149b73ec0bb3b6cb /net/openvswitch | |
| parent | 7b3b209e61adf575faf21d08a47f6a842b7b0767 (diff) | |
| download | lwn-5d50aa83e2c8e91ced2cca77c198b468ca9210f4.tar.gz lwn-5d50aa83e2c8e91ced2cca77c198b468ca9210f4.zip | |
openvswitch: support asymmetric conntrack
The openvswitch 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 openvswitch module doesn't have such capability.
Like netfilter hook infrastructure, we should run through NAT twice to
keep the symmetry.
Fixes: 05752523e565 ("openvswitch: Interface with NAT.")
Signed-off-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch')
| -rw-r--r-- | net/openvswitch/conntrack.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index df9c80bf621d..e726159cfcfa 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -903,6 +903,17 @@ static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, } err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->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 = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, + maniptype); + } + /* Mark NAT done if successful and update the flow key. */ if (err == NF_ACCEPT) ovs_nat_update_key(key, skb, maniptype); |