ipv4: Don't miss existing cached metrics in new routes.

Always lookup to see if we have an existing inetpeer entry for
a route.  Let FLOWI_FLAG_PRECOW_METRICS merely influence the
"create" argument to rt_bind_peer().

Also, call rt_bind_peer() unconditionally since it is not
possible for rt->peer to be non-NULL at this point.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index e4c8165..0ba6a38 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1859,25 +1859,28 @@ static unsigned int ipv4_default_mtu(const struct dst_entry *dst)
 
 static void rt_init_metrics(struct rtable *rt, struct fib_info *fi)
 {
-       if (!(rt->fl.flags & FLOWI_FLAG_PRECOW_METRICS)) {
-       no_cow:
-               if (fi->fib_metrics != (u32 *) dst_default_metrics) {
-                       rt->fi = fi;
-                       atomic_inc(&fi->fib_clntref);
-               }
-               dst_init_metrics(&rt->dst, fi->fib_metrics, true);
-       } else {
-               struct inet_peer *peer;
+       struct inet_peer *peer;
+       int create = 0;
 
-               if (!rt->peer)
-                       rt_bind_peer(rt, 1);
-               peer = rt->peer;
-               if (!peer)
-                       goto no_cow;
+       /* If a peer entry exists for this destination, we must hook
+        * it up in order to get at cached metrics.
+        */
+       if (rt->fl.flags & FLOWI_FLAG_PRECOW_METRICS)
+               create = 1;
+
+       rt_bind_peer(rt, create);
+       peer = rt->peer;
+       if (peer) {
                if (inet_metrics_new(peer))
                        memcpy(peer->metrics, fi->fib_metrics,
                               sizeof(u32) * RTAX_MAX);
                dst_init_metrics(&rt->dst, peer->metrics, false);
+       } else {
+               if (fi->fib_metrics != (u32 *) dst_default_metrics) {
+                       rt->fi = fi;
+                       atomic_inc(&fi->fib_clntref);
+               }
+               dst_init_metrics(&rt->dst, fi->fib_metrics, true);
        }
 }