neigh: only allow init_net to change the default neigh_parms

Though we don't export the /proc/sys/net/ipv[4,6]/neigh/default/
directory to the un-init_net, but we can still use cmd such as
"ip ntable change name arp_cache locktime 129" to change the locktime
of default neigh_parms.

This patch disallows the un-init_net to find out the neigh_table.parms.
So the un-init_net will failed to influence the init_net.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 53eab513955a..86f9b165bbba 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1419,7 +1419,7 @@ static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,
 
         for (p = &tbl->parms; p; p = p->next) {
                 if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) ||
-                    (!p->dev && !ifindex))
+                    (!p->dev && !ifindex && net_eq(net, &init_net)))
                         return p;
         }