Release 4.7 include/net/cls_cgroup.h

/*
 * 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>
#include <net/inet_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;
}

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static inline void sock_update_classid(struct sock_cgroup_data *skcd)
{
	u32 classid;

	classid = task_cls_classid(current);
	sock_cgroup_set_classid(skcd, classid);
}

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static inline u32 task_get_classid(const struct sk_buff *skb)
{
	u32 classid = task_cls_state(current)->classid;

	/* Due to the nature of the classifier it is required to ignore all
         * packets originating from softirq context as accessing `current'
         * would lead to false results.
         *
         * This test assumes that all callers of dev_queue_xmit() explicitly
         * disable bh. Knowing this, it is possible to detect softirq based
         * calls by looking at the number of nested bh disable calls because
         * softirqs always disables bh.
         */
	if (in_serving_softirq()) {
		struct sock *sk = skb_to_full_sk(skb);

		/* If there is an sock_cgroup_classid we'll use that. */
		if (!sk || !sk_fullsock(sk))
			return 0;

		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
	}

	return classid;
}
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#else /* !CONFIG_CGROUP_NET_CLASSID */


static inline void sock_update_classid(struct sock_cgroup_data *skcd)
{
}

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static inline u32 task_get_classid(const struct sk_buff *skb)
{
	return 0;
}
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#endif /* CONFIG_CGROUP_NET_CLASSID */
#endif  /* _NET_CLS_CGROUP_H */
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Directory: include/net

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