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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 | int classid; |
31 | |
32 | if (in_interrupt()) |
33 | return 0; |
34 | |
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; |
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; |
48 | u32 classid = 0; |
49 | |
50 | if (in_interrupt()) |
51 | return 0; |
52 | |
53 | rcu_read_lock(); |
54 | id = rcu_dereference_index_check(net_cls_subsys_id, |
55 | rcu_read_lock_held()); |
56 | if (id >= 0) |
57 | classid = container_of(task_subsys_state(p, id), |
58 | struct cgroup_cls_state, css)->classid; |
59 | rcu_read_unlock(); |
60 | |
61 | return classid; |
62 | } |
63 | #endif |
64 | #else |
65 | static inline u32 task_cls_classid(struct task_struct *p) |
66 | { |
67 | return 0; |
68 | } |
69 | #endif |
70 | #endif /* _NET_CLS_CGROUP_H */ |
71 |
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