netfilter: nf_conntrack: fix event flooding in GRE protocol tracker

GRE connections cause ctnetlink event flood because the ASSURED event
is set for every packet received.

Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Tested-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index cf616e55ca41..d69facdd9a7a 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -241,8 +241,8 @@ static int gre_packet(struct nf_conn *ct,
                 nf_ct_refresh_acct(ct, ctinfo, skb,
                                    ct->proto.gre.stream_timeout);
                 /* Also, more likely to be important, and not a probe. */
-                set_bit(IPS_ASSURED_BIT, &ct->status);
-                nf_conntrack_event_cache(IPCT_ASSURED, ct);
+                if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
+                        nf_conntrack_event_cache(IPCT_ASSURED, ct);
         } else
                 nf_ct_refresh_acct(ct, ctinfo, skb,
                                    ct->proto.gre.timeout);