net: ipv6: Do not consider link state for nexthop validation

Similar to IPv4, do not consider link state when validating next hops.

Currently, if the link is down default routes can fail to insert:
 $ ip -6 ro add vrf blue default via 2100:2::64 dev eth2
 RTNETLINK answers: No route to host

With this patch the command succeeds.

Fixes: 8c14586fc320 ("net: ipv6: Use passed in table for nexthop lookups")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 3ac19eb81a86..947ed1ded026 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -658,7 +658,8 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
         struct net_device *dev = rt->dst.dev;
 
         if (dev && !netif_carrier_ok(dev) &&
-            idev->cnf.ignore_routes_with_linkdown)
+            idev->cnf.ignore_routes_with_linkdown &&
+            !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
                 goto out;
 
         if (rt6_check_expired(rt))
@@ -1052,6 +1053,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
         int strict = 0;
 
         strict |= flags & RT6_LOOKUP_F_IFACE;
+        strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
         if (net->ipv6.devconf_all->forwarding == 0)
                 strict |= RT6_LOOKUP_F_REACHABLE;
 
@@ -1791,7 +1793,7 @@ static struct rt6_info *ip6_nh_lookup_table(struct net *net,
         };
         struct fib6_table *table;
         struct rt6_info *rt;
-        int flags = RT6_LOOKUP_F_IFACE;
+        int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
 
         table = fib6_get_table(net, cfg->fc_table);
         if (!table)