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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 | ||
10 | struct 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 | ||
24 | struct 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 | ||
55 | static inline struct netlink_sock *nlk_sk(struct sock *sk) | |
56 | { | |
57 | return container_of(sk, struct netlink_sock, sk); | |
58 | } | |
59 | ||
60 | struct 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 | ||
74 | extern struct netlink_table *nl_table; | |
75 | extern rwlock_t nl_table_lock; | |
76 | extern struct mutex nl_sk_hash_lock; | |
77 | ||
78 | #endif |