[PATCH 4.9 027/172] netfilter: synproxy: fix conntrackd interaction

From: Greg Kroah-Hartman
Date: Mon Jul 03 2017 - 10:41:08 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Eric Leblond <eric@xxxxxxxxx>

commit 87e94dbc210a720a34be5c1174faee5c84be963e upstream.

This patch fixes the creation of connection tracking entry from
netlink when synproxy is used. It was missing the addition of
the synproxy extension.

This was causing kernel crashes when a conntrack entry created by
conntrackd was used after the switch of traffic from active node
to the passive node.

Signed-off-by: Eric Leblond <eric@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

net/netfilter/nf_conntrack_netlink.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -45,6 +45,8 @@
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
#include <net/netfilter/nf_conntrack_labels.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/netfilter/nf_conntrack_synproxy.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l4proto.h>
@@ -1800,6 +1802,8 @@ ctnetlink_create_conntrack(struct net *n
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
+ nfct_seqadj_ext_add(ct);
+ nfct_synproxy_ext_add(ct);

/* we must add conntrack extensions before confirmation. */
ct->status |= IPS_CONFIRMED;