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authorDavid Ahern <dsa@cumulusnetworks.com>2017-03-25 01:21:57 +0300
committerDavid S. Miller <davem@davemloft.net>2017-03-28 00:09:50 +0300
commit4ea8efadf5690c1ab22f981a5fcff819bd09ff31 (patch)
tree74d242126811f7d73bc09832cd46865c253de9cb /net/mpls
parentc00e51ddbfda73d2be6d61fea2e58aeb57527475 (diff)
downloadlinux-4ea8efadf5690c1ab22f981a5fcff819bd09ff31.tar.xz
net: mpls: Delete route when all nexthops have been deleted
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 <dsa@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls')
-rw-r--r--net/mpls/af_mpls.c9
1 files changed, 8 insertions, 1 deletions
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);
}
}