ipv6: Set nexthop flags during route creation

It is valid to install routes with a nexthop device that does not have a
carrier, so we need to make sure they're marked accordingly.

As explained in the previous patch, host and anycast routes are never
marked with the 'linkdown' flag.

Note that reject routes are unaffected, as these use the loopback device
which always has a carrier.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2fd36c7dd1430a0cdfb4c5fc57efe9122f66505a..314e3bf41f6fa038313b6e41db63656ec38d4640 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2746,6 +2746,9 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
        rt->rt6i_flags = cfg->fc_flags;
 
 install_route:
+       if (!(rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
+           !netif_carrier_ok(dev))
+               rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
        rt->dst.dev = dev;
        rt->rt6i_idev = idev;
        rt->rt6i_table = table;