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/*
* 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>
#ifdef CONFIG_CGROUPS
struct cgroup_cls_state
{
struct cgroup_subsys_state css;
u32 classid;
};
#ifdef CONFIG_NET_CLS_CGROUP
static inline u32 task_cls_classid(struct task_struct *p)
{
int classid;
if (in_interrupt())
return 0;
rcu_read_lock();
classid = container_of(task_subsys_state(p, net_cls_subsys_id),
struct cgroup_cls_state, css)->classid;
rcu_read_unlock();
return classid;
}
#else
extern int net_cls_subsys_id;
static inline u32 task_cls_classid(struct task_struct *p)
{
int id;
u32 classid = 0;
if (in_interrupt())
return 0;
rcu_read_lock();
id = rcu_dereference_index_check(net_cls_subsys_id,
rcu_read_lock_held());
if (id >= 0)
classid = container_of(task_subsys_state(p, id),
struct cgroup_cls_state, css)->classid;
rcu_read_unlock();
return classid;
}
#endif
#else
static inline u32 task_cls_classid(struct task_struct *p)
{
return 0;
}
#endif
#endif /* _NET_CLS_CGROUP_H */
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