[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, 3 insertions, 2 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index c6d71526f625..216e01b0f44a 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -59,6 +59,7 @@
 #include <linux/in_route.h>
 #include <linux/route.h>
 #include <linux/skbuff.h>
+#include <net/net_namespace.h>
 #include <net/dst.h>
 #include <net/sock.h>
 #include <linux/gfp.h>
@@ -928,13 +929,13 @@ static const struct file_operations raw_seq_fops = {
 
 int __init raw_proc_init(void)
 {
-        if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
+        if (!proc_net_fops_create(&init_net, "raw", S_IRUGO, &raw_seq_fops))
                 return -ENOMEM;
         return 0;
 }
 
 void __init raw_proc_exit(void)
 {
-        proc_net_remove("raw");
+        proc_net_remove(&init_net, "raw");
 }
 #endif /* CONFIG_PROC_FS */