include/net/cls_cgroup.h

Source file repositories/reference/linux-study-clean/include/net/cls_cgroup.h

File Facts

System
Linux kernel
Corpus path
include/net/cls_cgroup.h
Extension
.h
Size
2086 bytes
Lines
89
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

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_cgroup_data *skcd)
{
	u32 classid;

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

static inline u32 __task_get_classid(struct task_struct *task)
{
	return task_cls_state(task)->classid;
}

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

	/* 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 (softirq_count()) {
		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;
}
#else /* !CONFIG_CGROUP_NET_CLASSID */
static inline void sock_update_classid(struct sock_cgroup_data *skcd)
{
}

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

Annotation

Implementation Notes