1/*
2 * cls_cgroup.h			Control Group Classifier
3 *
4 * Authors:	Thomas Graf <tgraf@suug.ch>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#ifndef _NET_CLS_CGROUP_H
14#define _NET_CLS_CGROUP_H
15
16#include <linux/cgroup.h>
17#include <linux/hardirq.h>
18#include <linux/rcupdate.h>
19#include <net/sock.h>
20
21#ifdef CONFIG_CGROUP_NET_CLASSID
22struct cgroup_cls_state {
23	struct cgroup_subsys_state css;
24	u32 classid;
25};
26
27struct cgroup_cls_state *task_cls_state(struct task_struct *p);
28
29static inline u32 task_cls_classid(struct task_struct *p)
30{
31	u32 classid;
32
33	if (in_interrupt())
34		return 0;
35
36	rcu_read_lock();
37	classid = container_of(task_css(p, net_cls_cgrp_id),
38			       struct cgroup_cls_state, css)->classid;
39	rcu_read_unlock();
40
41	return classid;
42}
43
44static inline void sock_update_classid(struct sock *sk)
45{
46	u32 classid;
47
48	classid = task_cls_classid(current);
49	if (classid != sk->sk_classid)
50		sk->sk_classid = classid;
51}
52#else /* !CONFIG_CGROUP_NET_CLASSID */
53static inline void sock_update_classid(struct sock *sk)
54{
55}
56#endif /* CONFIG_CGROUP_NET_CLASSID */
57#endif  /* _NET_CLS_CGROUP_H */
58