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 <[email protected]> Acked-by: David Ahern <[email protected]> Signed-off-by: David S. Miller <[email protected]>
kyagi · Jan 8, 2018 · 5609b80 · 5609b80
1 parent 27c6fa7
commit 5609b80
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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;