ipv6: don't flush routes when setting loopback down

When loopback device is being brought down, then keep the route table
entries because they are special. The entries in the local table for
linklocal routes and ::1 address should not be purged.

This is a sub optimal solution to the problem and should be replaced
by a better fix in future.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 93b7a933a7758254ed70ed849d333ad4d19114a7..848b355910424e75d42df6b9218eae3824ee213c 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2669,7 +2669,9 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
        ASSERT_RTNL();
 
-       rt6_ifdown(net, dev);
+       /* Flush routes if device is being removed or it is not loopback */
+       if (how || !(dev->flags & IFF_LOOPBACK))
+               rt6_ifdown(net, dev);
        neigh_ifdown(&nd_tbl, dev);
 
        idev = __in6_dev_get(dev);