summaryrefslogblamecommitdiff
path: root/net/netlink/af_netlink.h
blob: dcc89c74b514817fac81e34246ee08b60245d442 (plain) (tree) 
0f29c7686468 ^








ccdfcc398594 ^














0f29c7686468 ^












16b304f3404f ^


0f29c7686468 ^





ccdfcc398594 ^






0f29c7686468 ^




















85aec6328f33 ^









0f29c7686468 ^









da12c90e0997 ^

0f29c7686468 ^







1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22

23
24
25
26
27
28
29
30
31
32
33
34

35
36

37
38
39
40
41

42
43
44
45
46
47

48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67

68
69
70
71
72
73
74
75
76

77
78
79
80
81
82
83
84
85

86

87
88
89
90
91
92
93








                                                                 













                                                 











                                                                    

                                           




                                                                    





                                            



















                                                          








                                                                   








                                                   
                                                                               






                                           
#ifndef _AF_NETLINK_H
#define _AF_NETLINK_H

#include <net/sock.h>

#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))

struct netlink_ring {
	void			**pg_vec;
	unsigned int		head;
	unsigned int		frames_per_block;
	unsigned int		frame_size;
	unsigned int		frame_max;

	unsigned int		pg_vec_order;
	unsigned int		pg_vec_pages;
	unsigned int		pg_vec_len;

	atomic_t		pending;
};

struct netlink_sock {
	/* struct sock has to be the first member of netlink_sock */
	struct sock		sk;
	u32			portid;
	u32			dst_portid;
	u32			dst_group;
	u32			flags;
	u32			subscriptions;
	u32			ngroups;
	unsigned long		*groups;
	unsigned long		state;
	wait_queue_head_t	wait;
	bool			cb_running;
	struct netlink_callback	cb;
	struct mutex		*cb_mutex;
	struct mutex		cb_def_mutex;
	void			(*netlink_rcv)(struct sk_buff *skb);
	void			(*netlink_bind)(int group);
	struct module		*module;
#ifdef CONFIG_NETLINK_MMAP
	struct mutex		pg_vec_lock;
	struct netlink_ring	rx_ring;
	struct netlink_ring	tx_ring;
	atomic_t		mapped;
#endif /* CONFIG_NETLINK_MMAP */
};

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

struct nl_portid_hash {
	struct hlist_head	*table;
	unsigned long		rehash_time;

	unsigned int		mask;
	unsigned int		shift;

	unsigned int		entries;
	unsigned int		max_shift;

	u32			rnd;
};

static inline bool netlink_skb_is_mmaped(const struct sk_buff *skb)
{
#ifdef CONFIG_NETLINK_MMAP
	return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
#else
	return false;
#endif /* CONFIG_NETLINK_MMAP */
}

struct netlink_table {
	struct nl_portid_hash	hash;
	struct hlist_head	mc_list;
	struct listeners __rcu	*listeners;
	unsigned int		flags;
	unsigned int		groups;
	struct mutex		*cb_mutex;
	struct module		*module;
	void			(*bind)(int group);
	bool			(*compare)(struct net *net, struct sock *sock);
	int			registered;
};

extern struct netlink_table *nl_table;
extern rwlock_t nl_table_lock;

#endif