1#ifndef _AF_NETLINK_H
2#define _AF_NETLINK_H
3
4#include <linux/rhashtable.h>
5#include <net/sock.h>
6
7#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
8#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
9
10struct netlink_ring {
11	void			**pg_vec;
12	unsigned int		head;
13	unsigned int		frames_per_block;
14	unsigned int		frame_size;
15	unsigned int		frame_max;
16
17	unsigned int		pg_vec_order;
18	unsigned int		pg_vec_pages;
19	unsigned int		pg_vec_len;
20
21	atomic_t		pending;
22};
23
24struct netlink_sock {
25	/* struct sock has to be the first member of netlink_sock */
26	struct sock		sk;
27	u32			portid;
28	u32			dst_portid;
29	u32			dst_group;
30	u32			flags;
31	u32			subscriptions;
32	u32			ngroups;
33	unsigned long		*groups;
34	unsigned long		state;
35	size_t			max_recvmsg_len;
36	wait_queue_head_t	wait;
37	bool			cb_running;
38	struct netlink_callback	cb;
39	struct mutex		*cb_mutex;
40	struct mutex		cb_def_mutex;
41	void			(*netlink_rcv)(struct sk_buff *skb);
42	int			(*netlink_bind)(int group);
43	void			(*netlink_unbind)(int group);
44	struct module		*module;
45#ifdef CONFIG_NETLINK_MMAP
46	struct mutex		pg_vec_lock;
47	struct netlink_ring	rx_ring;
48	struct netlink_ring	tx_ring;
49	atomic_t		mapped;
50#endif /* CONFIG_NETLINK_MMAP */
51
52	struct rhash_head	node;
53};
54
55static inline struct netlink_sock *nlk_sk(struct sock *sk)
56{
57	return container_of(sk, struct netlink_sock, sk);
58}
59
60struct netlink_table {
61	struct rhashtable	hash;
62	struct hlist_head	mc_list;
63	struct listeners __rcu	*listeners;
64	unsigned int		flags;
65	unsigned int		groups;
66	struct mutex		*cb_mutex;
67	struct module		*module;
68	int			(*bind)(int group);
69	void			(*unbind)(int group);
70	bool			(*compare)(struct net *net, struct sock *sock);
71	int			registered;
72};
73
74extern struct netlink_table *nl_table;
75extern rwlock_t nl_table_lock;
76extern struct mutex nl_sk_hash_lock;
77
78#endif
79