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ipv6: Do not consider linkdown nexthops during multipath

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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: 35103d1117 ("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>
This commit is contained in:
Ido Schimmel 2017-11-21 09:50:12 +02:00 committed by David S. Miller
parent d7aa04a5e8
commit bbfcd77631
1 changed files with 5 additions and 0 deletions
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5
net/ipv6/route.c
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@ -472,6 +472,11 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
&match->rt6i_siblings, rt6i_siblings) {
route_choosen--;
if (route_choosen == 0) {
struct inet6_dev *idev = sibling->rt6i_idev;
if (!netif_carrier_ok(sibling->dst.dev) &&
idev->cnf.ignore_routes_with_linkdown)
break;
if (rt6_score_route(sibling, oif, strict) < 0)
break;
match = sibling;