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

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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>
This commit is contained in:
David S. Miller 2011-02-04 14:37:30 -08:00
parent bd4a6974cc
commit 0131ba451e
1 changed files with 17 additions and 14 deletions
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31
net/ipv4/route.c
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@ -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:
struct inet_peer *peer;
int create = 0;
/* 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);
} else {
struct inet_peer *peer;
if (!rt->peer)
rt_bind_peer(rt, 1);
peer = rt->peer;
if (!peer)
goto no_cow;
if (inet_metrics_new(peer))
memcpy(peer->metrics, fi->fib_metrics,
sizeof(u32) * RTAX_MAX);
dst_init_metrics(&rt->dst, peer->metrics, false);
}
}