net: ipv6: Do not add multicast route for l3 master devices

L3 master devices are virtual devices similar to the loopback
device. Link local and multicast routes for these devices do
not make sense. The ipv6 addrconf code already skips adding a
linklocal address; do the same for the mcast route.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 47f837a58e0ad83f152272af0c15c6361e535cf7..b12553905e42e7fc1cc9b6ffb78de7affdc9e12f 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2254,7 +2254,7 @@ static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
                return ERR_PTR(-EACCES);
 
        /* Add default multicast route */
-       if (!(dev->flags & IFF_LOOPBACK))
+       if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
                addrconf_add_mroute(dev);
 
        return idev;