From 0131ba451e20239c5dc701027c1a2edef95e1a6e Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 4 Feb 2011 14:37:30 -0800 Subject: [PATCH] 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 --- net/ipv4/route.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index e4c81652f17d..0ba6a382b2b4 100644 --- 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); } } -- 2.20.1