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net: mpls: Don't show nexthop if device has been deleted

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If the device for a nexthop in a multipath route is deleted, the nexthop
is effectively removed from the route. Currently, a route dump still
returns the nexhop though without the device set:

$ ip -f mpls ro ls
100
	nexthopvia inet 10.11.1.2  dev br0
	nexthopvia inet 10.100.3.1  dev eth3
$ ip li del br0
$ ip -f mpls ro ls
100
	nexthopvia inet 10.11.1.2  dev * dead linkdown
	nexthopvia inet 10.100.3.1  dev eth3

Since the nexthop is effectively deleted, drop the hop from the route
dump.

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 15:21:56 -07:00 committed by David S. Miller
parent 88275ed0cb
commit c00e51ddbf
1 changed files with 5 additions and 3 deletions
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6
net/mpls/af_mpls.c
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@ -1769,12 +1769,14 @@ static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
goto nla_put_failure;
for_nexthops(rt) {
dev = rtnl_dereference(nh->nh_dev);
if (!dev)
continue;
rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
if (!rtnh)
goto nla_put_failure;
dev = rtnl_dereference(nh->nh_dev);
if (dev)
rtnh->rtnh_ifindex = dev->ifindex;
if (nh->nh_flags & RTNH_F_LINKDOWN) {
rtnh->rtnh_flags |= RTNH_F_LINKDOWN;