From: David Ahern Date: Fri, 24 Mar 2017 22:21:56 +0000 (-0700) Subject: net: mpls: Don't show nexthop if device has been deleted X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c00e51ddbfda73d2be6d61fea2e58aeb57527475;p=linux.git net: mpls: Don't show nexthop if device has been deleted 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 Acked-by: Roopa Prabhu Signed-off-by: David S. Miller --- diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index cd8be8d5e4ad4..3861f8dfa9c1f 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -1769,13 +1769,15 @@ 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; + rtnh->rtnh_ifindex = dev->ifindex; if (nh->nh_flags & RTNH_F_LINKDOWN) { rtnh->rtnh_flags |= RTNH_F_LINKDOWN; linkdown++;