[NETNS][IPV6] flowlabels - make proc per namespace

Make /proc/net/ip6_flowlabel show only flow labels belonging to the
current network namespace.
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_flowlabel.c

@@ -611,6 +611,7 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
 #ifdef CONFIG_PROC_FS
 
 struct ip6fl_iter_state {
+	struct seq_net_private p;
 	int bucket;
 };
 
@@ -620,12 +621,15 @@ static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
 {
 	struct ip6_flowlabel *fl = NULL;
 	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+	struct net *net = seq_file_net(seq);
 
 	for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
-		if (fl_ht[state->bucket]) {
-			fl = fl_ht[state->bucket];
+		fl = fl_ht[state->bucket];
+
+		while (fl && fl->fl_net != net)
+			fl = fl->next;
+		if (fl)
 			break;
-		}
 	}
 	return fl;
 }
@@ -633,12 +637,18 @@ static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
 {
 	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+	struct net *net = seq_file_net(seq);
 
 	fl = fl->next;
+try_again:
+	while (fl && fl->fl_net != net)
+		fl = fl->next;
+
 	while (!fl) {
-		if (++state->bucket <= FL_HASH_MASK)
+		if (++state->bucket <= FL_HASH_MASK) {
 			fl = fl_ht[state->bucket];
-		else
+			goto try_again;
+		} else
 			break;
 	}
 	return fl;
@@ -708,8 +718,8 @@ static const struct seq_operations ip6fl_seq_ops = {
 
 static int ip6fl_seq_open(struct inode *inode, struct file *file)
 {
-	return seq_open_private(file, &ip6fl_seq_ops,
-			sizeof(struct ip6fl_iter_state));
+	return seq_open_net(inode, file, &ip6fl_seq_ops,
+			    sizeof(struct ip6fl_iter_state));
 }
 
 static const struct file_operations ip6fl_seq_fops = {
@@ -717,12 +727,13 @@ static const struct file_operations ip6fl_seq_fops = {
 	.open		=	ip6fl_seq_open,
 	.read		=	seq_read,
 	.llseek		=	seq_lseek,
-	.release	=	seq_release_private,
+	.release	=	seq_release_net,
 };
 
 static int ip6_flowlabel_proc_init(struct net *net)
 {
-	if (!proc_net_fops_create(net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops))
+	if (!proc_net_fops_create(net, "ip6_flowlabel",
+				  S_IRUGO, &ip6fl_seq_fops))
 		return -ENOMEM;
 	return 0;
 }
@@ -745,25 +756,21 @@ static inline void ip6_flowlabel_proc_fini(struct net *net)
 static inline void ip6_flowlabel_net_exit(struct net *net)
 {
 	ip6_fl_purge(net);
+	ip6_flowlabel_proc_fini(net);
 }
 
 static struct pernet_operations ip6_flowlabel_net_ops = {
+	.init = ip6_flowlabel_proc_init,
 	.exit = ip6_flowlabel_net_exit,
 };
 
 int ip6_flowlabel_init(void)
 {
-	int err;
-
-	err = register_pernet_subsys(&ip6_flowlabel_net_ops);
-	if (err)
-		return err;
-	return ip6_flowlabel_proc_init(&init_net);
+	return register_pernet_subsys(&ip6_flowlabel_net_ops);
 }
 
 void ip6_flowlabel_cleanup(void)
 {
 	del_timer(&ip6_fl_gc_timer);
 	unregister_pernet_subsys(&ip6_flowlabel_net_ops);
-	ip6_flowlabel_proc_fini(&init_net);
 }