From e37791ec1ad785b59022ae211f63a16189bacebf Mon Sep 17 00:00:00 2001 From: David Ahern Date: Fri, 10 Mar 2017 09:46:15 -0800 Subject: mpls: Send route delete notifications when router module is unloaded When the mpls_router module is unloaded, mpls routes are deleted but notifications are not sent to userspace leaving userspace caches out of sync. Add the call to mpls_notify_route in mpls_net_exit as routes are freed. Fixes: 0189197f44160 ("mpls: Basic routing support") Signed-off-by: David Ahern Signed-off-by: David S. Miller --- net/mpls/af_mpls.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/mpls') diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 3818686182b2..a1477989ed0b 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -2028,6 +2028,7 @@ static void mpls_net_exit(struct net *net) for (index = 0; index < platform_labels; index++) { struct mpls_route *rt = rtnl_dereference(platform_label[index]); RCU_INIT_POINTER(platform_label[index], NULL); + mpls_notify_route(net, index, rt, NULL, NULL); mpls_rt_free(rt); } rtnl_unlock(); -- cgit v1.2.3 From 79099aab38c8f5c746748b066ae74ba984fe2cc8 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Fri, 10 Mar 2017 14:11:39 -0800 Subject: mpls: Do not decrement alive counter for unregister events Multipath routes can be rendered usesless when a device in one of the paths is deleted. For example: $ ip -f mpls ro ls 100 nexthop as to 200 via inet 172.16.2.2 dev virt12 nexthop as to 300 via inet 172.16.3.2 dev br0 101 nexthop as to 201 via inet6 2000:2::2 dev virt12 nexthop as to 301 via inet6 2000:3::2 dev br0 $ ip li del br0 When br0 is deleted the other hop is not considered in mpls_select_multipath because of the alive check -- rt_nhn_alive is 0. rt_nhn_alive is decremented once in mpls_ifdown when the device is taken down (NETDEV_DOWN) and again when it is deleted (NETDEV_UNREGISTER). For a 2 hop route, deleting one device drops the alive count to 0. Since devices are taken down before unregistering, the decrement on NETDEV_UNREGISTER is redundant. Fixes: c89359a42e2a4 ("mpls: support for dead routes") Signed-off-by: David Ahern Signed-off-by: David S. Miller --- net/mpls/af_mpls.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/mpls') diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index a1477989ed0b..33211f9a2656 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -1288,7 +1288,8 @@ static void mpls_ifdown(struct net_device *dev, int event) /* fall through */ case NETDEV_CHANGE: nh->nh_flags |= RTNH_F_LINKDOWN; - ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1; + if (event != NETDEV_UNREGISTER) + ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1; break; } if (event == NETDEV_UNREGISTER) -- cgit v1.2.3