[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/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
index 559a0d0244cf..4fd4c46892e3 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);