/*
* cls_cgroup.h Control Group Classifier
*
* Authors: Thomas Graf <[email protected]>
*
* 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>

#if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
struct cgroup_cls_state
{
struct cgroup_subsys_state css;
u32 classid;
};

void sock_update_classid(struct sock *sk);

#if IS_BUILTIN(CONFIG_NET_CLS_CGROUP)
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_subsys_id),
struct cgroup_cls_state, css)->classid;
rcu_read_unlock();

return classid;
}
#elif IS_MODULE(CONFIG_NET_CLS_CGROUP)
static inline u32 task_cls_classid(struct task_struct *p)
{
struct cgroup_subsys_state *css;
u32 classid = 0;

if (in_interrupt())
return 0;

rcu_read_lock();
css = task_css(p, net_cls_subsys_id);
if (css)
classid = container_of(css,
struct cgroup_cls_state, css)->classid;
rcu_read_unlock();

return classid;
}
#endif
#else /* !CGROUP_NET_CLS_CGROUP */
static inline void sock_update_classid(struct sock *sk)
{
}

static inline u32 task_cls_classid(struct task_struct *p)
{
return 0;
}
#endif /* CGROUP_NET_CLS_CGROUP */
#endif /* _NET_CLS_CGROUP_H */