net: track link status of ipv6 nexthops
Add support to track current link status of ipv6 nexthops to match
recent changes that added support for ipv4 nexthops. This takes a
simple approach to track linkdown status for next-hops and simply
checks the dev for the dst entry and sets proper flags that to be used
in the netlink message.
v2: drop use of rt6i_nhflags since it is not needed right now
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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