+int seq_open_net(struct inode *ino, struct file *f,
+ const struct seq_operations *ops, int size)
+{
+ struct net *net;
+ struct seq_net_private *p;
+
+ BUG_ON(size < sizeof(*p));
+
+ net = get_proc_net(ino);
+ if (net == NULL)
+ return -ENXIO;
+
+ p = __seq_open_private(f, ops, size);
+ if (p == NULL) {
+ put_net(net);
+ return -ENOMEM;
+ }
+#ifdef CONFIG_NET_NS
+ p->net = net;
+#endif
+ return 0;
+}
+EXPORT_SYMBOL_GPL(seq_open_net);
+
+int seq_release_net(struct inode *ino, struct file *f)
+{
+ struct seq_file *seq;
+
+ seq = f->private_data;
+
+ put_net(seq_file_net(seq));
+ seq_release_private(ino, f);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(seq_release_net);
+
+static struct net *get_proc_task_net(struct inode *dir)
+{
+ struct task_struct *task;
+ struct nsproxy *ns;
+ struct net *net = NULL;
+
+ rcu_read_lock();
+ task = pid_task(proc_pid(dir), PIDTYPE_PID);
+ if (task != NULL) {
+ ns = task_nsproxy(task);
+ if (ns != NULL)
+ net = get_net(ns->net_ns);
+ }
+ rcu_read_unlock();
+
+ return net;
+}
+
+static struct dentry *proc_tgid_net_lookup(struct inode *dir,
+ struct dentry *dentry, struct nameidata *nd)
+{
+ struct dentry *de;
+ struct net *net;
+
+ de = ERR_PTR(-ENOENT);
+ net = get_proc_task_net(dir);
+ if (net != NULL) {
+ de = proc_lookup_de(net->proc_net, dir, dentry);
+ put_net(net);
+ }
+ return de;
+}
+
+static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ struct net *net;
+
+ net = get_proc_task_net(inode);
+
+ generic_fillattr(inode, stat);
+
+ if (net != NULL) {
+ stat->nlink = net->proc_net->nlink;
+ put_net(net);
+ }
+
+ return 0;
+}
+
+const struct inode_operations proc_net_inode_operations = {
+ .lookup = proc_tgid_net_lookup,
+ .getattr = proc_tgid_net_getattr,
+};
+
+static int proc_tgid_net_readdir(struct file *filp, void *dirent,
+ filldir_t filldir)
+{
+ int ret;
+ struct net *net;
+
+ ret = -EINVAL;
+ net = get_proc_task_net(filp->f_path.dentry->d_inode);
+ if (net != NULL) {
+ ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
+ put_net(net);
+ }
+ return ret;
+}
+
+const struct file_operations proc_net_operations = {
+ .read = generic_read_dir,
+ .readdir = proc_tgid_net_readdir,
+};
+
+