From a91275eff43a527e1a25d6d034cbcd19ee323e64 Mon Sep 17 00:00:00 2001
From: Daniel Lezcano <dlezcano@fr.ibm.com>
Date: Fri, 21 Mar 2008 04:11:58 -0700
Subject: [PATCH 1/1] [NETNS][IPV6] udp - make proc handle the network
 namespace

This patch makes the common udp proc functions to take care of which
socket they should show taking into account the namespace it belongs.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/udp.h |  1 +
 net/ipv4/udp.c    | 32 ++++++++++++++++++++++++++++----
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/include/net/udp.h b/include/net/udp.h
index c6669c0..a1b33d6 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -192,6 +192,7 @@ struct udp_seq_afinfo {
 };
 
 struct udp_iter_state {
+	struct net              *net;
 	sa_family_t		family;
 	struct hlist_head	*hashtable;
 	int			bucket;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 7ea1b67..049e925 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1512,10 +1512,13 @@ static struct sock *udp_get_first(struct seq_file *seq)
 {
 	struct sock *sk;
 	struct udp_iter_state *state = seq->private;
+	struct net *net = state->net;
 
 	for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) {
 		struct hlist_node *node;
 		sk_for_each(sk, node, state->hashtable + state->bucket) {
+			if (sk->sk_net != net)
+				continue;
 			if (sk->sk_family == state->family)
 				goto found;
 		}
@@ -1528,12 +1531,13 @@ found:
 static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 {
 	struct udp_iter_state *state = seq->private;
+	struct net *net = state->net;
 
 	do {
 		sk = sk_next(sk);
 try_again:
 		;
-	} while (sk && sk->sk_family != state->family);
+	} while (sk && sk->sk_net != net && sk->sk_family != state->family);
 
 	if (!sk && ++state->bucket < UDP_HTABLE_SIZE) {
 		sk = sk_head(state->hashtable + state->bucket);
@@ -1582,31 +1586,51 @@ static int udp_seq_open(struct inode *inode, struct file *file)
 {
 	struct udp_seq_afinfo *afinfo = PDE(inode)->data;
 	struct seq_file *seq;
+	struct net *net;
 	int rc = -ENOMEM;
 	struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
 
 	if (!s)
 		goto out;
+
+	rc = -ENXIO;
+	net = get_proc_net(inode);
+	if (!net)
+		goto out_kfree;
+
 	s->family		= afinfo->family;
 	s->hashtable		= afinfo->hashtable;
 	s->seq_ops.start	= udp_seq_start;
 	s->seq_ops.next		= udp_seq_next;
 	s->seq_ops.show		= afinfo->seq_show;
 	s->seq_ops.stop		= udp_seq_stop;
+	s->net                  = net;
 
 	rc = seq_open(file, &s->seq_ops);
 	if (rc)
-		goto out_kfree;
+		goto out_put_net;
 
-	seq	     = file->private_data;
+	seq = file->private_data;
 	seq->private = s;
 out:
 	return rc;
+out_put_net:
+	put_net(net);
 out_kfree:
 	kfree(s);
 	goto out;
 }
 
+static int udp_seq_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct udp_iter_state *s = seq->private;
+
+	put_net(s->net);
+	seq_release_private(inode, file);
+	return 0;
+}
+
 /* ------------------------------------------------------------------------ */
 int udp_proc_register(struct udp_seq_afinfo *afinfo)
 {
@@ -1619,7 +1643,7 @@ int udp_proc_register(struct udp_seq_afinfo *afinfo)
 	afinfo->seq_fops->open		= udp_seq_open;
 	afinfo->seq_fops->read		= seq_read;
 	afinfo->seq_fops->llseek	= seq_lseek;
-	afinfo->seq_fops->release	= seq_release_private;
+	afinfo->seq_fops->release	= udp_seq_release;
 
 	p = proc_net_fops_create(&init_net, afinfo->name, S_IRUGO, afinfo->seq_fops);
 	if (p)
-- 
1.8.2.3