ipv6: Make mc_forwarding sysctl read-only.

The kernel manages this value internally, as necessary, as
VIFs are added/removed and as multicast routers are registered
and deregistered.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e92ad8455c63..f9afb452249c 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4250,7 +4250,7 @@ static struct addrconf_sysctl_table
                         .procname       =       "mc_forwarding",
                         .data           =       &ipv6_devconf.mc_forwarding,
                         .maxlen         =       sizeof(int),
-                        .mode           =       0644,
+                        .mode           =       0444,
                         .proc_handler   =       proc_dointvec,
                 },
 #endif