lkml.org 
[lkml]   [2019]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.9 178/199] openvswitch: support asymmetric conntrack
    Date
    From: Aaron Conole <aconole@redhat.com>

    [ Upstream commit 5d50aa83e2c8e91ced2cca77c198b468ca9210f4 ]

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/openvswitch/conntrack.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    --- a/net/openvswitch/conntrack.c
    +++ b/net/openvswitch/conntrack.c
    @@ -709,6 +709,17 @@ static int ovs_ct_nat(struct net *net, s
    }
    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);

    \
     
     \ /
      Last update: 2019-12-19 19:50    [W:2.722 / U:0.048 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site