net/ipv6: Do not allow route add with a device that is down

IPv6 allows routes to be installed when the device is not up (admin up).
Worse, it does not mark it as LINKDOWN. IPv4 does not allow it and really
there is no reason for IPv6 to allow it, so check the flags and deny if
device is admin down.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f85da2f1e729..aa4411c81e7e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2734,6 +2734,12 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
         if (!dev)
                 goto out;
 
+        if (!(dev->flags & IFF_UP)) {
+                NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+                err = -ENETDOWN;
+                goto out;
+        }
+
         if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
                 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
                         NL_SET_ERR_MSG(extack, "Invalid source address");