ipv4: rt_cache_valid must check expired routes

commit d2d68ba9fe8 (ipv4: Cache input routes in fib_info nexthops.)
introduced rt_cache_valid() helper. It unfortunately doesn't check if
route is expired before caching it.

I noticed sk_setup_caps() was constantly called on a tcp workload.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6bcb8fc71cbc..3f7bb7185c50 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -444,7 +444,7 @@ static inline int ip_rt_proc_init(void)
 }
 #endif /* CONFIG_PROC_FS */
 
-static inline int rt_is_expired(struct rtable *rth)
+static inline bool rt_is_expired(const struct rtable *rth)
 {
         return rth->rt_genid != rt_genid(dev_net(rth->dst.dev));
 }
@@ -1222,9 +1222,11 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt)
         }
 }
 
-static bool rt_cache_valid(struct rtable *rt)
+static bool rt_cache_valid(const struct rtable *rt)
 {
-        return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK);
+        return  rt &&
+                rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
+                !rt_is_expired(rt);
 }
 
 static void rt_set_nexthop(struct rtable *rt, __be32 daddr,