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