root/include/net/cls_cgroup.h

DEFINITIONS

1. task_cls_classid
2. sock_update_classid
3. sock_update_classid

/*
 * 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 */