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