/*
   * cls_cgroup.h			Control Group Classifier
   *
   * Authors:	Thomas Graf <tgraf@suug.ch>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 2 of the License, or (at your option)
   * any later version.
   *
   */
  
  #ifndef _NET_CLS_CGROUP_H
  #define _NET_CLS_CGROUP_H
  
  #include <linux/cgroup.h>
  #include <linux/hardirq.h>
  #include <linux/rcupdate.h>

  #include <net/sock.h>

  #ifdef CONFIG_CGROUP_NET_CLASSID
  struct cgroup_cls_state {

  	struct cgroup_subsys_state css;
  	u32 classid;
  };

  struct cgroup_cls_state *task_cls_state(struct task_struct *p);

  static inline u32 task_cls_classid(struct task_struct *p)
  {

  	u32 classid;

  	if (in_interrupt())
  		return 0;

  	rcu_read_lock();

  	classid = container_of(task_css(p, net_cls_cgrp_id),

  			       struct cgroup_cls_state, css)->classid;
  	rcu_read_unlock();
  
  	return classid;

  }

  static inline void sock_update_classid(struct sock *sk)

  {

  	u32 classid;

  	classid = task_cls_classid(current);
  	if (classid != sk->sk_classid)
  		sk->sk_classid = classid;
  }
  #else /* !CONFIG_CGROUP_NET_CLASSID */
  static inline void sock_update_classid(struct sock *sk)

  {

  }

  #endif /* CONFIG_CGROUP_NET_CLASSID */

  #endif  /* _NET_CLS_CGROUP_H */