When all devices for all nexthops in a route have been deleted, the
route is effectively dead, so remove it.
Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
net/mpls/af_mpls.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 3861f8dfa9c1..74755920c689 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1299,7 +1299,7 @@ static void mpls_ifdown(struct net_device *dev, int event)
struct mpls_route __rcu **platform_label;
struct net *net = dev_net(dev);
unsigned int nh_flags = RTNH_F_DEAD | RTNH_F_LINKDOWN;
- unsigned int alive;
+ unsigned int alive, deleted;
unsigned index;
platform_label = rtnl_dereference(net->mpls.platform_label);
@@ -1310,6 +1310,7 @@ static void mpls_ifdown(struct net_device *dev, int event)
continue;
alive = 0;
+ deleted = 0;
change_nexthops(rt) {
if (rtnl_dereference(nh->nh_dev) != dev)
goto next;
@@ -1328,9 +1329,15 @@ static void mpls_ifdown(struct net_device *dev, int
event)
next:
if (!(nh->nh_flags & nh_flags))
alive++;
+ if (!rtnl_dereference(nh->nh_dev))
+ deleted++;
} endfor_nexthops(rt);
WRITE_ONCE(rt->rt_nhn_alive, alive);
+
+ /* if there are no more nexthops, delete the route */
+ if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
+ mpls_route_update(net, index, NULL, NULL);
}
}
--
2.1.4
