[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/ipx/ipx_proc.c b/net/ipx/ipx_proc.c
index 4226e71ae1e3..d483a00dc427 100644
--- a/net/ipx/ipx_proc.c
+++ b/net/ipx/ipx_proc.c
@@ -9,6 +9,7 @@
 #include <linux/proc_fs.h>
 #include <linux/spinlock.h>
 #include <linux/seq_file.h>
+#include <net/net_namespace.h>
 #include <net/tcp_states.h>
 #include <net/ipx.h>
 
@@ -353,7 +354,7 @@ int __init ipx_proc_init(void)
         struct proc_dir_entry *p;
         int rc = -ENOMEM;
 
-        ipx_proc_dir = proc_mkdir("ipx", proc_net);
+        ipx_proc_dir = proc_mkdir("ipx", init_net.proc_net);
 
         if (!ipx_proc_dir)
                 goto out;
@@ -381,7 +382,7 @@ out_socket:
 out_route:
         remove_proc_entry("interface", ipx_proc_dir);
 out_interface:
-        remove_proc_entry("ipx", proc_net);
+        remove_proc_entry("ipx", init_net.proc_net);
         goto out;
 }
 
@@ -390,7 +391,7 @@ void __exit ipx_proc_exit(void)
         remove_proc_entry("interface", ipx_proc_dir);
         remove_proc_entry("route", ipx_proc_dir);
         remove_proc_entry("socket", ipx_proc_dir);
-        remove_proc_entry("ipx", proc_net);
+        remove_proc_entry("ipx", init_net.proc_net);
 }
 
 #else /* CONFIG_PROC_FS */