1/*
 2 * cls_cgroup.h			Control Group Classifier
 3 *
 4 * Authors:	Thomas Graf <tgraf@suug.ch>
 5 *
 6 * This program is free software; you can redistribute it and/or modify it
 7 * under the terms of the GNU General Public License as published by the Free
 8 * Software Foundation; either version 2 of the License, or (at your option)
 9 * any later version.
10 *
11 */
12
13#ifndef _NET_CLS_CGROUP_H
14#define _NET_CLS_CGROUP_H
15
16#include <linux/cgroup.h>
17#include <linux/hardirq.h>
18#include <linux/rcupdate.h>
19#include <net/sock.h>
20#include <net/inet_sock.h>
21
22#ifdef CONFIG_CGROUP_NET_CLASSID
23struct cgroup_cls_state {
24	struct cgroup_subsys_state css;
25	u32 classid;
26};
27
28struct cgroup_cls_state *task_cls_state(struct task_struct *p);
29
30static inline u32 task_cls_classid(struct task_struct *p)
31{
32	u32 classid;
33
34	if (in_interrupt())
35		return 0;
36
37	rcu_read_lock();
38	classid = container_of(task_css(p, net_cls_cgrp_id),
39			       struct cgroup_cls_state, css)->classid;
40	rcu_read_unlock();
41
42	return classid;
43}
44
45static inline void sock_update_classid(struct sock_cgroup_data *skcd)
46{
47	u32 classid;
48
49	classid = task_cls_classid(current);
50	sock_cgroup_set_classid(skcd, classid);
51}
52
53static inline u32 task_get_classid(const struct sk_buff *skb)
54{
55	u32 classid = task_cls_state(current)->classid;
56
57	/* Due to the nature of the classifier it is required to ignore all
58	 * packets originating from softirq context as accessing `current'
59	 * would lead to false results.
60	 *
61	 * This test assumes that all callers of dev_queue_xmit() explicitly
62	 * disable bh. Knowing this, it is possible to detect softirq based
63	 * calls by looking at the number of nested bh disable calls because
64	 * softirqs always disables bh.
65	 */
66	if (in_serving_softirq()) {
67		struct sock *sk = skb_to_full_sk(skb);
68
69		/* If there is an sock_cgroup_classid we'll use that. */
70		if (!sk || !sk_fullsock(sk))
71			return 0;
72
73		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
74	}
75
76	return classid;
77}
78#else /* !CONFIG_CGROUP_NET_CLASSID */
79static inline void sock_update_classid(struct sock_cgroup_data *skcd)
80{
81}
82
83static inline u32 task_get_classid(const struct sk_buff *skb)
84{
85	return 0;
86}
87#endif /* CONFIG_CGROUP_NET_CLASSID */
88#endif  /* _NET_CLS_CGROUP_H */

 1/*
 2 * cls_cgroup.h			Control Group Classifier
 3 *
 4 * Authors:	Thomas Graf <tgraf@suug.ch>
 5 *
 6 * This program is free software; you can redistribute it and/or modify it
 7 * under the terms of the GNU General Public License as published by the Free
 8 * Software Foundation; either version 2 of the License, or (at your option)
 9 * any later version.
10 *
11 */
12
13#ifndef _NET_CLS_CGROUP_H
14#define _NET_CLS_CGROUP_H
15
16#include <linux/cgroup.h>
17#include <linux/hardirq.h>
18#include <linux/rcupdate.h>
19#include <net/sock.h>
 
20
21#ifdef CONFIG_CGROUP_NET_CLASSID
22struct cgroup_cls_state {
23	struct cgroup_subsys_state css;
24	u32 classid;
25};
26
27struct cgroup_cls_state *task_cls_state(struct task_struct *p);
28
29static inline u32 task_cls_classid(struct task_struct *p)
30{
31	u32 classid;
32
33	if (in_interrupt())
34		return 0;
35
36	rcu_read_lock();
37	classid = container_of(task_css(p, net_cls_cgrp_id),
38			       struct cgroup_cls_state, css)->classid;
39	rcu_read_unlock();
40
41	return classid;
42}
43
44static inline void sock_update_classid(struct sock *sk)
45{
46	u32 classid;
47
48	classid = task_cls_classid(current);
49	if (classid != sk->sk_classid)
50		sk->sk_classid = classid;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
51}
52#else /* !CONFIG_CGROUP_NET_CLASSID */
53static inline void sock_update_classid(struct sock *sk)
 
 
 
 
54{
 
55}
56#endif /* CONFIG_CGROUP_NET_CLASSID */
57#endif  /* _NET_CLS_CGROUP_H */