net/netlink/af_netlink.h

Source file repositories/reference/linux-study-clean/net/netlink/af_netlink.h

File Facts

System
Linux kernel
Corpus path
net/netlink/af_netlink.h
Extension
.h
Size
1922 bytes
Lines
80
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 netlink_sock {
	/* struct sock has to be the first member of netlink_sock */
	struct sock		sk;
	unsigned long		flags;
	u32			portid;
	u32			dst_portid;
	u32			dst_group;
	u32			subscriptions;
	u32			ngroups;
	unsigned long		*groups;
	unsigned long		state;
	size_t			max_recvmsg_len;
	wait_queue_head_t	wait;
	bool			bound;
	bool			cb_running;
	int			dump_done_errno;
	struct netlink_callback	cb;
	struct mutex		nl_cb_mutex;

	void			(*netlink_rcv)(struct sk_buff *skb);
	int			(*netlink_bind)(struct net *net, int group);
	void			(*netlink_unbind)(struct net *net, int group);
	void			(*netlink_release)(struct sock *sk,
						   unsigned long *groups);
	struct module		*module;

	struct rhash_head	node;
	struct rcu_head		rcu;
};

static inline struct netlink_sock *nlk_sk(struct sock *sk)
{
	return container_of(sk, struct netlink_sock, sk);
}

#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)

struct netlink_table {
	struct rhashtable	hash;
	struct hlist_head	mc_list;
	struct listeners __rcu	*listeners;
	unsigned int		flags;
	unsigned int		groups;
	struct mutex		*cb_mutex;
	struct module		*module;
	int			(*bind)(struct net *net, int group);
	void			(*unbind)(struct net *net, int group);
	void                    (*release)(struct sock *sk,
					   unsigned long *groups);
	int			registered;
};

extern struct netlink_table *nl_table;
extern rwlock_t nl_table_lock;

#endif

Annotation

Implementation Notes