[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>

2 files changed, 29 insertions, 4 deletions

diff --git a/include/net/udp.h b/include/net/udp.h
index c6669c0a74c7..a1b33d667199 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 7ea1b67b6de1..049e92519616 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)