[UNIX]: Make the unix sysctl tables per-namespace

This is the core.

 * add the ctl_table_header on the struct net;
 * make the unix_sysctl_register and _unregister clone the table;
 * moves calls to them into per-net init and exit callbacks;
 * move the .data pointer in the proper place.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index b0cf07519b81..f97b2a4469ae 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -11,6 +11,8 @@
 struct proc_dir_entry;
 struct net_device;
 struct sock;
+struct ctl_table_header;
+
 struct net {
         atomic_t                count;          /* To decided when the network
                                                  *  namespace should be freed.
@@ -41,6 +43,7 @@ struct net {
 
         /* unix sockets */
         int                     sysctl_unix_max_dgram_qlen;
+        struct ctl_table_header *unix_ctl;
 };
 
 #ifdef CONFIG_NET