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>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a91f6d3..8d62d85 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1156,7 +1156,7 @@
candp = NULL;
now = jiffies;
- if (!rt_caching(dev_net(rt->dst.dev))) {
+ if (!rt_caching(dev_net(rt->dst.dev)) || (rt->dst.flags & DST_NOCACHE)) {
/*
* If we're not caching, just tell the caller we
* were successful and don't touch the route. The
@@ -2582,6 +2582,9 @@
rt_set_nexthop(rth, fl4, res, fi, type, 0);
+ if (fl4->flowi4_flags & FLOWI_FLAG_RT_NOCACHE)
+ rth->dst.flags |= DST_NOCACHE;
+
return rth;
}