[NET]: Make /proc/net per network namespace

This patch makes /proc/net per network namespace.  It modifies the global
variables proc_net and proc_net_stat to be per network namespace.
The proc_net file helpers are modified to take a network namespace argument,
and all of their callers are fixed to pass &init_net for that argument.
This ensures that all of the /proc/net files are only visible and
usable in the initial network namespace until the code behind them
has been updated to be handle multiple network namespaces.

Making /proc/net per namespace is necessary as at least some files
in /proc/net depend upon the set of network devices which is per
network namespace, and even more files in /proc/net have contents
that are relevant to a single network namespace.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/net/tokenring/olympic.c b/drivers/net/tokenring/olympic.c
index 09b3cfb8e80..c323101a895 100644
--- a/drivers/net/tokenring/olympic.c
+++ b/drivers/net/tokenring/olympic.c
@@ -102,6 +102,7 @@
 #include <linux/jiffies.h>
 
 #include <net/checksum.h>
+#include <net/net_namespace.h>
 
 #include <asm/io.h>
 #include <asm/system.h>
@@ -268,9 +269,9 @@ static int __devinit olympic_probe(struct pci_dev *pdev, const struct pci_device
         printk("Olympic: %s registered as: %s\n",olympic_priv->olympic_card_name,dev->name);
         if (olympic_priv->olympic_network_monitor) { /* Must go after register_netdev as we need the device name */ 
                 char proc_name[20] ; 
-                strcpy(proc_name,"net/olympic_") ; 
+                strcpy(proc_name,"olympic_") ;
                 strcat(proc_name,dev->name) ; 
-                create_proc_read_entry(proc_name,0,NULL,olympic_proc_info,(void *)dev) ; 
+                create_proc_read_entry(proc_name,0,init_net.proc_net,olympic_proc_info,(void *)dev) ;
                 printk("Olympic: Network Monitor information: /proc/%s\n",proc_name); 
         }
         return  0 ;
@@ -1752,9 +1753,9 @@ static void __devexit olympic_remove_one(struct pci_dev *pdev)
 
         if (olympic_priv->olympic_network_monitor) { 
                 char proc_name[20] ; 
-                strcpy(proc_name,"net/olympic_") ; 
+                strcpy(proc_name,"olympic_") ;
                 strcat(proc_name,dev->name) ;
-                remove_proc_entry(proc_name,NULL); 
+                remove_proc_entry(proc_name,init_net.proc_net);
         }
         unregister_netdev(dev) ; 
         iounmap(olympic_priv->olympic_mmio) ;