tree c2652284123d238682df8993808cfda8f068112a
parent d7aa04a5e82b4f254d306926c81eae8df69e5200
author Ido Schimmel <idosch@mellanox.com> 1511250612 +0200
committer David S. Miller <davem@davemloft.net> 1511454407 +0900

ipv6: Do not consider linkdown nexthops during multipath

When the 'ignore_routes_with_linkdown' sysctl is set, we should not
consider linkdown nexthops during route lookup.

While the code correctly verifies that the initially selected route
('match') has a carrier, it does not perform the same check in the
subsequent multipath selection, resulting in a potential packet loss.

In case the chosen route does not have a carrier and the sysctl is set,
choose the initially selected route.

Fixes: 35103d11173b ("net: ipv6 sysctl option to ignore routes when nexthop link is down")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>