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Andrey Vagin0f29c762013-03-21 20:33:47 +04001#ifndef _AF_NETLINK_H
2#define _AF_NETLINK_H
3
Thomas Grafe3416942014-08-02 11:47:45 +02004#include <linux/rhashtable.h>
Johannes Bergee1c24422015-01-16 11:37:14 +01005#include <linux/atomic.h>
Andrey Vagin0f29c762013-03-21 20:33:47 +04006#include <net/sock.h>
7
8#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
9#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
10
11struct netlink_sock {
12 /* struct sock has to be the first member of netlink_sock */
13 struct sock sk;
14 u32 portid;
15 u32 dst_portid;
16 u32 dst_group;
17 u32 flags;
18 u32 subscriptions;
19 u32 ngroups;
20 unsigned long *groups;
21 unsigned long state;
Eric Dumazet9063e212014-03-07 12:02:33 -080022 size_t max_recvmsg_len;
Andrey Vagin0f29c762013-03-21 20:33:47 +040023 wait_queue_head_t wait;
Herbert Xuda314c92015-09-22 11:38:56 +080024 bool bound;
Pravin B Shelar16b304f2013-08-15 15:31:06 -070025 bool cb_running;
26 struct netlink_callback cb;
Andrey Vagin0f29c762013-03-21 20:33:47 +040027 struct mutex *cb_mutex;
28 struct mutex cb_def_mutex;
29 void (*netlink_rcv)(struct sk_buff *skb);
Johannes Berg023e2cf2014-12-23 21:00:06 +010030 int (*netlink_bind)(struct net *net, int group);
31 void (*netlink_unbind)(struct net *net, int group);
Andrey Vagin0f29c762013-03-21 20:33:47 +040032 struct module *module;
Thomas Grafe3416942014-08-02 11:47:45 +020033
34 struct rhash_head node;
Thomas Graf21e49022015-01-02 23:00:22 +010035 struct rcu_head rcu;
Andrey Vagin0f29c762013-03-21 20:33:47 +040036};
37
38static inline struct netlink_sock *nlk_sk(struct sock *sk)
39{
40 return container_of(sk, struct netlink_sock, sk);
41}
42
Andrey Vagin0f29c762013-03-21 20:33:47 +040043struct netlink_table {
Thomas Grafe3416942014-08-02 11:47:45 +020044 struct rhashtable hash;
Andrey Vagin0f29c762013-03-21 20:33:47 +040045 struct hlist_head mc_list;
46 struct listeners __rcu *listeners;
47 unsigned int flags;
48 unsigned int groups;
49 struct mutex *cb_mutex;
50 struct module *module;
Johannes Berg023e2cf2014-12-23 21:00:06 +010051 int (*bind)(struct net *net, int group);
52 void (*unbind)(struct net *net, int group);
Gao fengda12c902013-06-06 14:49:11 +080053 bool (*compare)(struct net *net, struct sock *sock);
Andrey Vagin0f29c762013-03-21 20:33:47 +040054 int registered;
55};
56
57extern struct netlink_table *nl_table;
58extern rwlock_t nl_table_lock;
Andrey Vagin0f29c762013-03-21 20:33:47 +040059
60#endif