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Herbert Xuf8451722010-05-24 00:12:34 -07001/*
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
20#ifdef CONFIG_CGROUPS
21struct cgroup_cls_state
22{
23 struct cgroup_subsys_state css;
24 u32 classid;
25};
26
27#ifdef CONFIG_NET_CLS_CGROUP
28static inline u32 task_cls_classid(struct task_struct *p)
29{
Li Zefan3fb5a992010-09-02 15:42:43 +000030 int classid;
31
Herbert Xuf8451722010-05-24 00:12:34 -070032 if (in_interrupt())
33 return 0;
34
Li Zefan3fb5a992010-09-02 15:42:43 +000035 rcu_read_lock();
36 classid = container_of(task_subsys_state(p, net_cls_subsys_id),
37 struct cgroup_cls_state, css)->classid;
38 rcu_read_unlock();
39
40 return classid;
Herbert Xuf8451722010-05-24 00:12:34 -070041}
42#else
43extern int net_cls_subsys_id;
44
45static inline u32 task_cls_classid(struct task_struct *p)
46{
47 int id;
Herbert Xuea16f912010-05-25 18:53:57 -070048 u32 classid = 0;
Herbert Xuf8451722010-05-24 00:12:34 -070049
50 if (in_interrupt())
51 return 0;
52
53 rcu_read_lock();
54 id = rcu_dereference(net_cls_subsys_id);
55 if (id >= 0)
56 classid = container_of(task_subsys_state(p, id),
57 struct cgroup_cls_state, css)->classid;
58 rcu_read_unlock();
59
60 return classid;
61}
62#endif
63#else
64static inline u32 task_cls_classid(struct task_struct *p)
65{
66 return 0;
67}
68#endif
69#endif /* _NET_CLS_CGROUP_H */