ipv4: tcp: dont cache output dst for syncookies

Don't cache output dst for syncookies, as this adds pressure on IP route
cache and rcu subsystem for no gain.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Hans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/flow.h b/include/net/flow.h
index 6c469dbdb917..bd524f598561 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -22,6 +22,7 @@ struct flowi_common {
 #define FLOWI_FLAG_ANYSRC               0x01
 #define FLOWI_FLAG_PRECOW_METRICS       0x02
 #define FLOWI_FLAG_CAN_SLEEP            0x04
+#define FLOWI_FLAG_RT_NOCACHE           0x08
         __u32   flowic_secid;
 };