netns xfrm: /proc/net/xfrm_stat in netns

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -1306,7 +1306,8 @@ static inline void xfrm6_fini(void)
 #endif
 
 #ifdef CONFIG_XFRM_STATISTICS
-extern int xfrm_proc_init(void);
+extern int xfrm_proc_init(struct net *net);
+extern void xfrm_proc_fini(struct net *net);
 #endif
 
 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);

net/xfrm/xfrm_policy.c

@@ -2377,14 +2377,20 @@ static struct notifier_block xfrm_dev_notifier = {
 #ifdef CONFIG_XFRM_STATISTICS
 static int __net_init xfrm_statistics_init(struct net *net)
 {
+	int rv;
+
 	if (snmp_mib_init((void **)net->mib.xfrm_statistics,
 			  sizeof(struct linux_xfrm_mib)) < 0)
 		return -ENOMEM;
-	return 0;
+	rv = xfrm_proc_init(net);
+	if (rv < 0)
+		snmp_mib_free((void **)net->mib.xfrm_statistics);
+	return rv;
 }
 
 static void xfrm_statistics_fini(struct net *net)
 {
+	xfrm_proc_fini(net);
 	snmp_mib_free((void **)net->mib.xfrm_statistics);
 }
 #else
@@ -2524,9 +2530,6 @@ void __init xfrm_init(void)
 {
 	register_pernet_subsys(&xfrm_net_ops);
 	xfrm_input_init();
-#ifdef CONFIG_XFRM_STATISTICS
-	xfrm_proc_init();
-#endif
 }
 
 #ifdef CONFIG_AUDITSYSCALL

net/xfrm/xfrm_proc.c

@@ -59,17 +59,18 @@ fold_field(void *mib[], int offt)
 
 static int xfrm_statistics_seq_show(struct seq_file *seq, void *v)
 {
+	struct net *net = seq->private;
 	int i;
 	for (i=0; xfrm_mib_list[i].name; i++)
 		seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name,
-			   fold_field((void **)init_net.mib.xfrm_statistics,
+			   fold_field((void **)net->mib.xfrm_statistics,
 				      xfrm_mib_list[i].entry));
 	return 0;
 }
 
 static int xfrm_statistics_seq_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, xfrm_statistics_seq_show, NULL);
+	return single_open_net(inode, file, xfrm_statistics_seq_show);
 }
 
 static struct file_operations xfrm_statistics_seq_fops = {
@@ -77,21 +78,18 @@ static struct file_operations xfrm_statistics_seq_fops = {
 	.open	 = xfrm_statistics_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
-	.release = single_release,
+	.release = single_release_net,
 };
 
-int __init xfrm_proc_init(void)
+int __net_init xfrm_proc_init(struct net *net)
 {
-	int rc = 0;
-
-	if (!proc_net_fops_create(&init_net, "xfrm_stat", S_IRUGO,
+	if (!proc_net_fops_create(net, "xfrm_stat", S_IRUGO,
 				  &xfrm_statistics_seq_fops))
-		goto stat_fail;
-
- out:
-	return rc;
-
- stat_fail:
-	rc = -ENOMEM;
-	goto out;
+		return -ENOMEM;
+	return 0;
+}
+
+void xfrm_proc_fini(struct net *net)
+{
+	proc_net_remove(net, "xfrm_stat");
 }