[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>

net/ipv4/ipvs/ip_vs_app.c

@@ -25,6 +25,7 @@
 #include <linux/skbuff.h>
 #include <linux/in.h>
 #include <linux/ip.h>
+#include <net/net_namespace.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
 #include <asm/system.h>
@@ -616,12 +617,12 @@ int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 int ip_vs_app_init(void)
 {
 	/* we will replace it with proc_net_ipvs_create() soon */
-	proc_net_fops_create("ip_vs_app", 0, &ip_vs_app_fops);
+	proc_net_fops_create(&init_net, "ip_vs_app", 0, &ip_vs_app_fops);
 	return 0;
 }
 
 
 void ip_vs_app_cleanup(void)
 {
-	proc_net_remove("ip_vs_app");
+	proc_net_remove(&init_net, "ip_vs_app");
 }

net/ipv4/ipvs/ip_vs_conn.c

@@ -35,6 +35,7 @@
 #include <linux/jhash.h>
 #include <linux/random.h>
 
+#include <net/net_namespace.h>
 #include <net/ip_vs.h>
 
 
@@ -922,7 +923,7 @@ int ip_vs_conn_init(void)
 		rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
 	}
 
-	proc_net_fops_create("ip_vs_conn", 0, &ip_vs_conn_fops);
+	proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops);
 
 	/* calculate the random value for connection hash */
 	get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
@@ -938,6 +939,6 @@ void ip_vs_conn_cleanup(void)
 
 	/* Release the empty cache */
 	kmem_cache_destroy(ip_vs_conn_cachep);
-	proc_net_remove("ip_vs_conn");
+	proc_net_remove(&init_net, "ip_vs_conn");
 	vfree(ip_vs_conn_tab);
 }

net/ipv4/ipvs/ip_vs_ctl.c

@@ -35,6 +35,7 @@
 #include <linux/netfilter_ipv4.h>
 #include <linux/mutex.h>
 
+#include <net/net_namespace.h>
 #include <net/ip.h>
 #include <net/route.h>
 #include <net/sock.h>
@@ -2356,8 +2357,8 @@ int ip_vs_control_init(void)
 		return ret;
 	}
 
-	proc_net_fops_create("ip_vs", 0, &ip_vs_info_fops);
-	proc_net_fops_create("ip_vs_stats",0, &ip_vs_stats_fops);
+	proc_net_fops_create(&init_net, "ip_vs", 0, &ip_vs_info_fops);
+	proc_net_fops_create(&init_net, "ip_vs_stats",0, &ip_vs_stats_fops);
 
 	sysctl_header = register_sysctl_table(vs_root_table);
 
@@ -2390,8 +2391,8 @@ void ip_vs_control_cleanup(void)
 	cancel_work_sync(&defense_work.work);
 	ip_vs_kill_estimator(&ip_vs_stats);
 	unregister_sysctl_table(sysctl_header);
-	proc_net_remove("ip_vs_stats");
-	proc_net_remove("ip_vs");
+	proc_net_remove(&init_net, "ip_vs_stats");
+	proc_net_remove(&init_net, "ip_vs");
 	nf_unregister_sockopt(&ip_vs_sockopts);
 	LeaveFunction(2);
 }

net/ipv4/ipvs/ip_vs_lblcr.c

@@ -50,6 +50,7 @@
 #include <linux/sysctl.h>
 /* for proc_net_create/proc_net_remove */
 #include <linux/proc_fs.h>
+#include <net/net_namespace.h>
 
 #include <net/ip_vs.h>
 
@@ -843,7 +844,7 @@ static int __init ip_vs_lblcr_init(void)
 	INIT_LIST_HEAD(&ip_vs_lblcr_scheduler.n_list);
 	sysctl_header = register_sysctl_table(lblcr_root_table);
 #ifdef CONFIG_IP_VS_LBLCR_DEBUG
-	proc_net_create("ip_vs_lblcr", 0, ip_vs_lblcr_getinfo);
+	proc_net_create(&init_net, "ip_vs_lblcr", 0, ip_vs_lblcr_getinfo);
 #endif
 	return register_ip_vs_scheduler(&ip_vs_lblcr_scheduler);
 }
@@ -852,7 +853,7 @@ static int __init ip_vs_lblcr_init(void)
 static void __exit ip_vs_lblcr_cleanup(void)
 {
 #ifdef CONFIG_IP_VS_LBLCR_DEBUG
-	proc_net_remove("ip_vs_lblcr");
+	proc_net_remove(&init_net, "ip_vs_lblcr");
 #endif
 	unregister_sysctl_table(sysctl_header);
 	unregister_ip_vs_scheduler(&ip_vs_lblcr_scheduler);