[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>

3 files changed, 10 insertions, 7 deletions

diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
index 559a0d0244c..4fd4c46892e 100644
--- a/drivers/isdn/divert/divert_procfs.c
+++ b/drivers/isdn/divert/divert_procfs.c
@@ -17,6 +17,7 @@
 #include <linux/fs.h>
 #endif
 #include <linux/isdnif.h>
+#include <net/net_namespace.h>
 #include "isdn_divert.h"
 
 
@@ -284,12 +285,12 @@ divert_dev_init(void)
 	init_waitqueue_head(&rd_queue);
 
 #ifdef CONFIG_PROC_FS
-	isdn_proc_entry = proc_mkdir("net/isdn", NULL);
+	isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
 	if (!isdn_proc_entry)
 		return (-1);
 	isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
 	if (!isdn_divert_entry) {
-		remove_proc_entry("net/isdn", NULL);
+		remove_proc_entry("isdn", init_net.proc_net);
 		return (-1);
 	}
 	isdn_divert_entry->proc_fops = &isdn_fops; 
@@ -309,7 +310,7 @@ divert_dev_deinit(void)
 
 #ifdef CONFIG_PROC_FS
 	remove_proc_entry("divert", isdn_proc_entry);
-	remove_proc_entry("net/isdn", NULL);
+	remove_proc_entry("isdn", init_net.proc_net);
 #endif	/* CONFIG_PROC_FS */
 
 	return (0);
diff --git a/drivers/isdn/hardware/eicon/diva_didd.c b/drivers/isdn/hardware/eicon/diva_didd.c
index d755d904e62..993b14cf177 100644
--- a/drivers/isdn/hardware/eicon/diva_didd.c
+++ b/drivers/isdn/hardware/eicon/diva_didd.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/proc_fs.h>
+#include <net/net_namespace.h>
 
 #include "platform.h"
 #include "di_defs.h"
@@ -86,7 +87,7 @@ proc_read(char *page, char **start, off_t off, int count, int *eof,
 
 static int DIVA_INIT_FUNCTION create_proc(void)
 {
-	proc_net_eicon = proc_mkdir("net/eicon", NULL);
+	proc_net_eicon = proc_mkdir("eicon", init_net.proc_net);
 
 	if (proc_net_eicon) {
 		if ((proc_didd =
@@ -102,7 +103,7 @@ static int DIVA_INIT_FUNCTION create_proc(void)
 static void remove_proc(void)
 {
 	remove_proc_entry(DRIVERLNAME, proc_net_eicon);
-	remove_proc_entry("net/eicon", NULL);
+	remove_proc_entry("eicon", init_net.proc_net);
 }
 
 static int DIVA_INIT_FUNCTION divadidd_init(void)
diff --git a/drivers/isdn/hysdn/hysdn_procconf.c b/drivers/isdn/hysdn/hysdn_procconf.c
index dc477e0aab0..27d890b48f8 100644
--- a/drivers/isdn/hysdn/hysdn_procconf.c
+++ b/drivers/isdn/hysdn/hysdn_procconf.c
@@ -16,6 +16,7 @@
 #include <linux/proc_fs.h>
 #include <linux/pci.h>
 #include <linux/smp_lock.h>
+#include <net/net_namespace.h>
 
 #include "hysdn_defs.h"
 
@@ -392,7 +393,7 @@ hysdn_procconf_init(void)
 	hysdn_card *card;
 	unsigned char conf_name[20];
 
-	hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, proc_net);
+	hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net);
 	if (!hysdn_proc_entry) {
 		printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
 		return (-1);
@@ -437,5 +438,5 @@ hysdn_procconf_release(void)
 		card = card->next;	/* point to next card */
 	}
 
-	remove_proc_entry(PROC_SUBDIR_NAME, proc_net);
+	remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net);
 }