| Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 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 | { |
| Li Zefan | 3fb5a99 | 2010-09-02 15:42:43 +0000 | [diff] [blame] | 30 | int classid; |
| 31 | |
| Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 32 | if (in_interrupt()) |
| 33 | return 0; |
| 34 | |
| Li Zefan | 3fb5a99 | 2010-09-02 15:42:43 +0000 | [diff] [blame] | 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; |
| Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 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; |
| Herbert Xu | ea16f91 | 2010-05-25 18:53:57 -0700 | [diff] [blame] | 48 | u32 classid = 0; |
| Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 49 | |
| 50 | if (in_interrupt()) |
| 51 | return 0; |
| 52 | |
| 53 | rcu_read_lock(); |
| Paul E. McKenney | d34a166 | 2010-06-14 17:06:21 -0700 | [diff] [blame] | 54 | id = rcu_dereference_index_check(net_cls_subsys_id, |
| 55 | rcu_read_lock_held()); |
| Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 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 */ |