From 42b6d6e824d349eef8a3d1925a2667564a31b8b8 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Mon, 13 Mar 2017 16:49:10 -0700 Subject: [PATCH] net: mpls: Fix nexthop alive tracking on down events [ Upstream commit 61733c91c454a61be0ffc93fe46a5d5f2f048c1c ] Alive tracking of nexthops can account for a link twice if the carrier goes down followed by an admin down of the same link rendering multipath routes useless. This is similar to 79099aab38c8 for UNREGISTER events and DOWN events. Fix by tracking number of alive nexthops in mpls_ifdown similar to the logic in mpls_ifup. Checking the flags per nexthop once after all events have been processed is simpler than trying to maintian a running count through all event combinations. Also, WRITE_ONCE is used instead of ACCESS_ONCE to set rt_nhn_alive per a comment from checkpatch: WARNING: Prefer WRITE_ONCE(, ) over ACCESS_ONCE() = Fixes: c89359a42e2a4 ("mpls: support for dead routes") Signed-off-by: David Ahern Acked-by: Robert Shearman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/mpls/af_mpls.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 1309e2c..c5a5a69 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -937,6 +937,8 @@ 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 index; platform_label = rtnl_dereference(net->mpls.platform_label); @@ -946,9 +948,11 @@ static void mpls_ifdown(struct net_device *dev, int event) if (!rt) continue; + alive = 0; change_nexthops(rt) { if (rtnl_dereference(nh->nh_dev) != dev) - continue; + goto next; + switch (event) { case NETDEV_DOWN: case NETDEV_UNREGISTER: @@ -956,13 +960,16 @@ static void mpls_ifdown(struct net_device *dev, int event) /* fall through */ case NETDEV_CHANGE: nh->nh_flags |= RTNH_F_LINKDOWN; - if (event != NETDEV_UNREGISTER) - ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1; break; } if (event == NETDEV_UNREGISTER) RCU_INIT_POINTER(nh->nh_dev, NULL); +next: + if (!(nh->nh_flags & nh_flags)) + alive++; } endfor_nexthops(rt); + + WRITE_ONCE(rt->rt_nhn_alive, alive); } } -- 2.7.4