xref: /openbmc/linux/net/netlink/af_netlink.h (revision d2999e1b)
1 #ifndef _AF_NETLINK_H
2 #define _AF_NETLINK_H
3 
4 #include <net/sock.h>
5 
6 #define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
7 #define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
8 
9 struct netlink_ring {
10 	void			**pg_vec;
11 	unsigned int		head;
12 	unsigned int		frames_per_block;
13 	unsigned int		frame_size;
14 	unsigned int		frame_max;
15 
16 	unsigned int		pg_vec_order;
17 	unsigned int		pg_vec_pages;
18 	unsigned int		pg_vec_len;
19 
20 	atomic_t		pending;
21 };
22 
23 struct netlink_sock {
24 	/* struct sock has to be the first member of netlink_sock */
25 	struct sock		sk;
26 	u32			portid;
27 	u32			dst_portid;
28 	u32			dst_group;
29 	u32			flags;
30 	u32			subscriptions;
31 	u32			ngroups;
32 	unsigned long		*groups;
33 	unsigned long		state;
34 	size_t			max_recvmsg_len;
35 	wait_queue_head_t	wait;
36 	bool			cb_running;
37 	struct netlink_callback	cb;
38 	struct mutex		*cb_mutex;
39 	struct mutex		cb_def_mutex;
40 	void			(*netlink_rcv)(struct sk_buff *skb);
41 	int			(*netlink_bind)(int group);
42 	void			(*netlink_unbind)(int group);
43 	struct module		*module;
44 #ifdef CONFIG_NETLINK_MMAP
45 	struct mutex		pg_vec_lock;
46 	struct netlink_ring	rx_ring;
47 	struct netlink_ring	tx_ring;
48 	atomic_t		mapped;
49 #endif /* CONFIG_NETLINK_MMAP */
50 };
51 
52 static inline struct netlink_sock *nlk_sk(struct sock *sk)
53 {
54 	return container_of(sk, struct netlink_sock, sk);
55 }
56 
57 struct nl_portid_hash {
58 	struct hlist_head	*table;
59 	unsigned long		rehash_time;
60 
61 	unsigned int		mask;
62 	unsigned int		shift;
63 
64 	unsigned int		entries;
65 	unsigned int		max_shift;
66 
67 	u32			rnd;
68 };
69 
70 struct netlink_table {
71 	struct nl_portid_hash	hash;
72 	struct hlist_head	mc_list;
73 	struct listeners __rcu	*listeners;
74 	unsigned int		flags;
75 	unsigned int		groups;
76 	struct mutex		*cb_mutex;
77 	struct module		*module;
78 	int			(*bind)(int group);
79 	void			(*unbind)(int group);
80 	bool			(*compare)(struct net *net, struct sock *sock);
81 	int			registered;
82 };
83 
84 extern struct netlink_table *nl_table;
85 extern rwlock_t nl_table_lock;
86 
87 #endif
88