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f8451725 HX |
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 | { | |
3fb5a991 LZ |
30 | int classid; |
31 | ||
f8451725 HX |
32 | if (in_interrupt()) |
33 | return 0; | |
34 | ||
3fb5a991 LZ |
35 | 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; | |
f8451725 HX |
41 | } |
42 | #else | |
43 | extern int net_cls_subsys_id; | |
44 | ||
45 | static inline u32 task_cls_classid(struct task_struct *p) | |
46 | { | |
47 | int id; | |
ea16f912 | 48 | u32 classid = 0; |
f8451725 HX |
49 | |
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 | |
64 | static inline u32 task_cls_classid(struct task_struct *p) | |
65 | { | |
66 | return 0; | |
67 | } | |
68 | #endif | |
69 | #endif /* _NET_CLS_CGROUP_H */ |