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net: mpls: Delete route when all nexthops have been deleted

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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>
This commit is contained in:
David Ahern 2017-03-24 15:21:57 -07:00 committed by David S. Miller
parent c00e51ddbf
commit 4ea8efadf5
1 changed files with 8 additions and 1 deletions
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9
net/mpls/af_mpls.c
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@ -1299,7 +1299,7 @@ static void mpls_ifdown(struct net_device *dev, int event)
struct mpls_route __rcu **platform_label; struct mpls_route __rcu **platform_label;
struct net *net = dev_net(dev); struct net *net = dev_net(dev);
unsigned int nh_flags = RTNH_F_DEAD | RTNH_F_LINKDOWN; unsigned int nh_flags = RTNH_F_DEAD | RTNH_F_LINKDOWN;
unsigned int alive; unsigned int alive, deleted;
unsigned index; unsigned index;
platform_label = rtnl_dereference(net->mpls.platform_label); platform_label = rtnl_dereference(net->mpls.platform_label);
@ -1310,6 +1310,7 @@ static void mpls_ifdown(struct net_device *dev, int event)
continue; continue;
alive = 0; alive = 0;
deleted = 0;
change_nexthops(rt) { change_nexthops(rt) {
if (rtnl_dereference(nh->nh_dev) != dev) if (rtnl_dereference(nh->nh_dev) != dev)
goto next; goto next;
@ -1328,9 +1329,15 @@ static void mpls_ifdown(struct net_device *dev, int event)
next: next:
if (!(nh->nh_flags & nh_flags)) if (!(nh->nh_flags & nh_flags))
alive++; alive++;
if (!rtnl_dereference(nh->nh_dev))
deleted++;
} endfor_nexthops(rt); } endfor_nexthops(rt);
WRITE_ONCE(rt->rt_nhn_alive, alive); 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);
} }
} }