[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/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 413a4ebb195c..1791399c7f10 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -21,6 +21,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+#include <net/net_namespace.h>
 #include <net/sock.h>
 
 #include <net/ipv6.h>
@@ -690,7 +691,7 @@ static const struct file_operations ip6fl_seq_fops = {
 void ip6_flowlabel_init(void)
 {
 #ifdef CONFIG_PROC_FS
-        proc_net_fops_create("ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
+        proc_net_fops_create(&init_net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
 #endif
 }
 
@@ -698,6 +699,6 @@ void ip6_flowlabel_cleanup(void)
 {
         del_timer(&ip6_fl_gc_timer);
 #ifdef CONFIG_PROC_FS
-        proc_net_remove("ip6_flowlabel");
+        proc_net_remove(&init_net, "ip6_flowlabel");
 #endif
 }