David Ahern 79099aab38 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: c89359a42e ("mpls: support for dead routes") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-03-12 23:45:36 -07:00
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af_mpls.c	mpls: Do not decrement alive counter for unregister events	2017-03-12 23:45:36 -07:00
internal.h	net: mpls: Add support for netconf	2017-02-20 11:13:37 -05:00
Kconfig	mpls: ip tunnel support	2015-07-21 10:39:05 -07:00
Makefile	mpls: ip tunnel support	2015-07-21 10:39:05 -07:00
mpls_gso.c	net: mpls: Fixups for GSO	2016-08-30 22:27:18 -07:00
mpls_iptunnel.c	lwtunnel: remove device arg to lwtunnel_build_state	2017-01-30 15:14:22 -05:00