1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _AF_NETLINK_H
 3#define _AF_NETLINK_H
 4
 5#include <linux/rhashtable.h>
 6#include <linux/atomic.h>
 7#include <linux/workqueue.h>
 8#include <net/sock.h>
 9
10/* flags */
11#define NETLINK_F_KERNEL_SOCKET		0x1
12#define NETLINK_F_RECV_PKTINFO		0x2
13#define NETLINK_F_BROADCAST_SEND_ERROR	0x4
14#define NETLINK_F_RECV_NO_ENOBUFS	0x8
15#define NETLINK_F_LISTEN_ALL_NSID	0x10
16#define NETLINK_F_CAP_ACK		0x20
17#define NETLINK_F_EXT_ACK		0x40
18#define NETLINK_F_STRICT_CHK		0x80
19
20#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
21#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
22
23struct 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			bound;
37	bool			cb_running;
38	int			dump_done_errno;
39	struct netlink_callback	cb;
40	struct mutex		*cb_mutex;
41	struct mutex		cb_def_mutex;
42	void			(*netlink_rcv)(struct sk_buff *skb);
43	int			(*netlink_bind)(struct net *net, int group);
44	void			(*netlink_unbind)(struct net *net, int group);
45	struct module		*module;
46
47	struct rhash_head	node;
48	struct rcu_head		rcu;
49	struct work_struct	work;
50};
51
52static inline struct netlink_sock *nlk_sk(struct sock *sk)
53{
54	return container_of(sk, struct netlink_sock, sk);
55}
56
57struct netlink_table {
58	struct rhashtable	hash;
59	struct hlist_head	mc_list;
60	struct listeners __rcu	*listeners;
61	unsigned int		flags;
62	unsigned int		groups;
63	struct mutex		*cb_mutex;
64	struct module		*module;
65	int			(*bind)(struct net *net, int group);
66	void			(*unbind)(struct net *net, int group);
67	bool			(*compare)(struct net *net, struct sock *sock);
68	int			registered;
69};
70
71extern struct netlink_table *nl_table;
72extern rwlock_t nl_table_lock;
73
74#endif