[NET] sysctl: prepare core tables to point to netns variables

Some of ctl variables are going to be on the struct
net. Here's the way to adjust the ->data pointer on the
ctl_table-s to point on the right variable.

Since some pointers still point on the global variables,
I keep turning the write bits off on such tables.

This looks to become a common procedure for net sysctls,
so later parts of this code may migrate to some more
generic place.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 57a7eadb8551..dc4cf7dda9d1 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -167,8 +167,13 @@ static __net_init int sysctl_core_net_init(struct net *net)
                 if (tbl == NULL)
                         goto err_dup;
 
-                for (tmp = tbl; tmp->procname; tmp++)
-                        tmp->mode &= ~0222;
+                for (tmp = tbl; tmp->procname; tmp++) {
+                        if (tmp->data >= (void *)&init_net &&
+                                        tmp->data < (void *)(&init_net + 1))
+                                tmp->data += (char *)net - (char *)&init_net;
+                        else
+                                tmp->mode &= ~0222;
+                }
         }
 
         net->sysctl_core_hdr = register_net_sysctl_table(net,