2 * cls_cgroup.h Control Group Classifier
4 * Authors: Thomas Graf <tgraf@suug.ch>
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)
13 #ifndef _NET_CLS_CGROUP_H
14 #define _NET_CLS_CGROUP_H
16 #include <linux/cgroup.h>
17 #include <linux/hardirq.h>
18 #include <linux/rcupdate.h>
21 #ifdef CONFIG_CGROUP_NET_CLASSID
22 struct cgroup_cls_state
{
23 struct cgroup_subsys_state css
;
27 struct cgroup_cls_state
*task_cls_state(struct task_struct
*p
);
29 static inline u32
task_cls_classid(struct task_struct
*p
)
37 classid
= container_of(task_css(p
, net_cls_cgrp_id
),
38 struct cgroup_cls_state
, css
)->classid
;
44 static inline void sock_update_classid(struct sock_cgroup_data
*skcd
)
48 classid
= task_cls_classid(current
);
49 sock_cgroup_set_classid(skcd
, classid
);
52 static inline u32
task_get_classid(const struct sk_buff
*skb
)
54 u32 classid
= task_cls_state(current
)->classid
;
56 /* Due to the nature of the classifier it is required to ignore all
57 * packets originating from softirq context as accessing `current'
58 * would lead to false results.
60 * This test assumes that all callers of dev_queue_xmit() explicitly
61 * disable bh. Knowing this, it is possible to detect softirq based
62 * calls by looking at the number of nested bh disable calls because
63 * softirqs always disables bh.
65 if (in_serving_softirq()) {
66 /* If there is an sock_cgroup_classid we'll use that. */
70 classid
= sock_cgroup_classid(&skb
->sk
->sk_cgrp_data
);
75 #else /* !CONFIG_CGROUP_NET_CLASSID */
76 static inline void sock_update_classid(struct sock_cgroup_data
*skcd
)
80 static inline u32
task_get_classid(const struct sk_buff
*skb
)
84 #endif /* CONFIG_CGROUP_NET_CLASSID */
85 #endif /* _NET_CLS_CGROUP_H */
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