[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/net/ieee80211/ieee80211_module.c b/net/ieee80211/ieee80211_module.c
index 17ad278696ed..69cb6aad25be 100644
--- a/net/ieee80211/ieee80211_module.c
+++ b/net/ieee80211/ieee80211_module.c
@@ -47,6 +47,7 @@
 #include <linux/wireless.h>
 #include <linux/etherdevice.h>
 #include <asm/uaccess.h>
+#include <net/net_namespace.h>
 #include <net/arp.h>
 
 #include <net/ieee80211.h>
@@ -264,7 +265,7 @@ static int __init ieee80211_init(void)
         struct proc_dir_entry *e;
 
         ieee80211_debug_level = debug;
-        ieee80211_proc = proc_mkdir(DRV_NAME, proc_net);
+        ieee80211_proc = proc_mkdir(DRV_NAME, init_net.proc_net);
         if (ieee80211_proc == NULL) {
                 IEEE80211_ERROR("Unable to create " DRV_NAME
                                 " proc directory\n");
@@ -273,7 +274,7 @@ static int __init ieee80211_init(void)
         e = create_proc_entry("debug_level", S_IFREG | S_IRUGO | S_IWUSR,
                               ieee80211_proc);
         if (!e) {
-                remove_proc_entry(DRV_NAME, proc_net);
+                remove_proc_entry(DRV_NAME, init_net.proc_net);
                 ieee80211_proc = NULL;
                 return -EIO;
         }
@@ -293,7 +294,7 @@ static void __exit ieee80211_exit(void)
 #ifdef CONFIG_IEEE80211_DEBUG
         if (ieee80211_proc) {
                 remove_proc_entry("debug_level", ieee80211_proc);
-                remove_proc_entry(DRV_NAME, proc_net);
+                remove_proc_entry(DRV_NAME, init_net.proc_net);
                 ieee80211_proc = NULL;
         }
 #endif                          /* CONFIG_IEEE80211_DEBUG */