include/net/cls_cgroup.h

   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 extern void sock_update_classid(struct sock *sk);
  28
  29 #ifdef CONFIG_NET_CLS_CGROUP
  30 static inline u32 task_cls_classid(struct task_struct *p)
  31 {
  32         int classid;
  33
  34         if (in_interrupt())
  35                 return 0;
  36
  37         rcu_read_lock();
  38         classid = container_of(task_subsys_state(p, net_cls_subsys_id),
  39                                struct cgroup_cls_state, css)->classid;
  40         rcu_read_unlock();
  41
  42         return classid;
  43 }
  44 #else
  45 extern int net_cls_subsys_id;
  46
  47 static inline u32 task_cls_classid(struct task_struct *p)
  48 {
  49         int id;
  50         u32 classid = 0;
  51
  52         if (in_interrupt())
  53                 return 0;
  54
  55         rcu_read_lock();
  56         id = rcu_dereference_index_check(net_cls_subsys_id,
  57                                          rcu_read_lock_held());
  58         if (id >= 0)
  59                 classid = container_of(task_subsys_state(p, id),
  60                                        struct cgroup_cls_state, css)->classid;
  61         rcu_read_unlock();
  62
  63         return classid;
  64 }
  65 #endif
  66 #else
  67 static inline void sock_update_classid(struct sock *sk)
  68 {
  69 }
  70
  71 static inline u32 task_cls_classid(struct task_struct *p)
  72 {
  73         return 0;
  74 }
  75 #endif
  76 #endif  /* _NET_CLS_CGROUP_H */