[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, 4 insertions, 3 deletions

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index 78e28ada1e2..0c35d72f5f8 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -47,6 +47,7 @@
 #include <linux/mm.h>
 #include <linux/ethtool.h>
 #include <linux/proc_fs.h>
+#include <net/net_namespace.h>
 #include <asm/semaphore.h>
 #include <asm/hvcall.h>
 #include <asm/atomic.h>
@@ -97,7 +98,7 @@ static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
 static struct kobj_type ktype_veth_pool;
 
 #ifdef CONFIG_PROC_FS
-#define IBMVETH_PROC_DIR "net/ibmveth"
+#define IBMVETH_PROC_DIR "ibmveth"
 static struct proc_dir_entry *ibmveth_proc_dir;
 #endif
 
@@ -1091,7 +1092,7 @@ static int __devexit ibmveth_remove(struct vio_dev *dev)
 #ifdef CONFIG_PROC_FS
 static void ibmveth_proc_register_driver(void)
 {
-        ibmveth_proc_dir = proc_mkdir(IBMVETH_PROC_DIR, NULL);
+        ibmveth_proc_dir = proc_mkdir(IBMVETH_PROC_DIR, init_net.proc_net);
         if (ibmveth_proc_dir) {
                 SET_MODULE_OWNER(ibmveth_proc_dir);
         }
@@ -1099,7 +1100,7 @@ static void ibmveth_proc_register_driver(void)
 
 static void ibmveth_proc_unregister_driver(void)
 {
-        remove_proc_entry(IBMVETH_PROC_DIR, NULL);
+        remove_proc_entry(IBMVETH_PROC_DIR, init_net.proc_net);
 }
 
 static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos)