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ipv6: Mark dead nexthops with appropriate flags 

When a netdev is put administratively down or unregistered all the
nexthops using it as their nexthop device should be marked with the
'dead' and 'linkdown' flags.

Currently, when a route is dumped its nexthop device is tested and the
flags are set accordingly. A similar check is performed during route
lookup.

Instead, we can simply mark the nexthops based on netdev events and
avoid checking the netdev's state during route dump and lookup.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2018-01-07 12:45:02 +02:00 committed by David S. Miller
parent 9fcb0714dc
commit 2b2413610e
1 changed files with 3 additions and 1 deletions
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4
net/ipv6/route.c
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@ -3473,8 +3473,10 @@ static int fib6_ifdown(struct rt6_info *rt, void *arg)
if (rt->dst.dev == dev &&
rt != adn->net->ipv6.ip6_null_entry &&
(rt->rt6i_nsiblings == 0 || netdev_unregistering(dev) ||
!rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
!rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) {
rt->rt6i_nh_flags |= (RTNH_F_DEAD | RTNH_F_LINKDOWN);
return -1;
}
return 0;
}