1#ifndef _AF_NETLINK_H
 2#define _AF_NETLINK_H
 3
 4#include <linux/rhashtable.h>
 5#include <linux/atomic.h>
 6#include <net/sock.h>
 7
 8#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
 9#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
10
11struct netlink_ring {
12	void			**pg_vec;
13	unsigned int		head;
14	unsigned int		frames_per_block;
15	unsigned int		frame_size;
16	unsigned int		frame_max;
17
18	unsigned int		pg_vec_order;
19	unsigned int		pg_vec_pages;
20	unsigned int		pg_vec_len;
21
22	atomic_t		pending;
23};
24
25struct netlink_sock {
26	/* struct sock has to be the first member of netlink_sock */
27	struct sock		sk;
28	u32			portid;
29	u32			dst_portid;
30	u32			dst_group;
31	u32			flags;
32	u32			subscriptions;
33	u32			ngroups;
34	unsigned long		*groups;
35	unsigned long		state;
36	size_t			max_recvmsg_len;
37	wait_queue_head_t	wait;
38	bool			bound;
39	bool			cb_running;
40	struct netlink_callback	cb;
41	struct mutex		*cb_mutex;
42	struct mutex		cb_def_mutex;
43	void			(*netlink_rcv)(struct sk_buff *skb);
44	int			(*netlink_bind)(struct net *net, int group);
45	void			(*netlink_unbind)(struct net *net, int group);
46	struct module		*module;
47
48	struct rhash_head	node;
49	struct rcu_head		rcu;
50};
51
52static inline struct netlink_sock *nlk_sk(struct sock *sk)
53{
54	return container_of(sk, struct netlink_sock, sk);
55}
56
57struct netlink_table {
58	struct rhashtable	hash;
59	struct hlist_head	mc_list;
60	struct listeners __rcu	*listeners;
61	unsigned int		flags;
62	unsigned int		groups;
63	struct mutex		*cb_mutex;
64	struct module		*module;
65	int			(*bind)(struct net *net, int group);
66	void			(*unbind)(struct net *net, int group);
67	bool			(*compare)(struct net *net, struct sock *sock);
68	int			registered;
69};
70
71extern struct netlink_table *nl_table;
72extern rwlock_t nl_table_lock;
73
74#endif