cls_cgroup.h

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/*
 * 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;
};

extern void sock_update_classid(struct sock *sk);

#if IS_BUILTIN(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;
}
#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_subsys_state(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 */