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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 | ||
20 | #ifdef CONFIG_CGROUPS | |
21 | struct cgroup_cls_state | |
22 | { | |
23 | struct cgroup_subsys_state css; | |
24 | u32 classid; | |
25 | }; | |
26 | ||
27 | #ifdef CONFIG_NET_CLS_CGROUP | |
28 | static inline u32 task_cls_classid(struct task_struct *p) | |
29 | { | |
30 | if (in_interrupt()) | |
31 | return 0; | |
32 | ||
33 | return container_of(task_subsys_state(p, net_cls_subsys_id), | |
937eada4 | 34 | struct cgroup_cls_state, css)->classid; |
f8451725 HX |
35 | } |
36 | #else | |
37 | extern int net_cls_subsys_id; | |
38 | ||
39 | static inline u32 task_cls_classid(struct task_struct *p) | |
40 | { | |
41 | int id; | |
ea16f912 | 42 | u32 classid = 0; |
f8451725 HX |
43 | |
44 | if (in_interrupt()) | |
45 | return 0; | |
46 | ||
47 | rcu_read_lock(); | |
48 | id = rcu_dereference(net_cls_subsys_id); | |
49 | if (id >= 0) | |
50 | classid = container_of(task_subsys_state(p, id), | |
51 | struct cgroup_cls_state, css)->classid; | |
52 | rcu_read_unlock(); | |
53 | ||
54 | return classid; | |
55 | } | |
56 | #endif | |
57 | #else | |
58 | static inline u32 task_cls_classid(struct task_struct *p) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | #endif | |
63 | #endif /* _NET_CLS_CGROUP_H */ |