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David Ahern 87c0286a07 mpls: Do not decrement alive counter for unregister events ... [ Upstream commit 79099aab38 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		6 years ago
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Kconfig	mpls: ip tunnel support	8 years ago
Makefile	mpls: ip tunnel support	8 years ago
af_mpls.c	mpls: Do not decrement alive counter for unregister events	6 years ago
internal.h	mpls: move mpls_hdr to a common location	7 years ago
mpls_gso.c	net: mpls: Fixups for GSO	7 years ago
mpls_iptunnel.c	net: Specify the owning module for lwtunnel ops	6 years ago