net: vrf: Fix dev refcnt leak due to IPv6 prefix route

[cascardo/linux.git] / net / ipv6 / addrconf.c

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 27aed1a..2db2116 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3255,6 +3255,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                           void *ptr)
 {
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+       struct netdev_notifier_changeupper_info *info;
        struct inet6_dev *idev = __in6_dev_get(dev);
        int run_pending = 0;
        int err;
@@ -3413,6 +3414,15 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                if (idev)
                        addrconf_type_change(dev, event);
                break;
+
+       case NETDEV_CHANGEUPPER:
+               info = ptr;
+
+               /* flush all routes if dev is linked to or unlinked from
+                * an L3 master device (e.g., VRF)
+                */
+               if (info->upper_dev && netif_is_l3_master(info->upper_dev))
+                       addrconf_ifdown(dev, 0);
        }
 
        return NOTIFY_OK;