mirror of https://gitee.com/openkylin/linux.git
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
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()) {
|
|
/* If there is an sk_classid we'll use that. */
|
|
if (!skb->sk)
|
|
return 0;
|
|
|
|
classid = skb->sk->sk_classid;
|
|
}
|
|
|
|
return classid;
|
|
}
|
|
#else /* !CONFIG_CGROUP_NET_CLASSID */
|
|
static inline void sock_update_classid(struct sock *sk)
|
|
{
|
|
}
|
|
|
|
static inline u32 task_get_classid(const struct sk_buff *skb)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_CGROUP_NET_CLASSID */
|
|
#endif /* _NET_CLS_CGROUP_H */
|