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 */
11enum {
12	NETLINK_F_KERNEL_SOCKET,
13	NETLINK_F_RECV_PKTINFO,
14	NETLINK_F_BROADCAST_SEND_ERROR,
15	NETLINK_F_RECV_NO_ENOBUFS,
16	NETLINK_F_LISTEN_ALL_NSID,
17	NETLINK_F_CAP_ACK,
18	NETLINK_F_EXT_ACK,
19	NETLINK_F_STRICT_CHK,
20};
21
22#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
23#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
24
25struct netlink_sock {
26	/* struct sock has to be the first member of netlink_sock */
27	struct sock		sk;
28	unsigned long		flags;
29	u32			portid;
30	u32			dst_portid;
31	u32			dst_group;
32	u32			subscriptions;
33	u32			ngroups;
34	unsigned long		*groups;
35	unsigned long		state;
36	size_t			max_recvmsg_len;
37	wait_queue_head_t	wait;
38	bool			bound;
39	bool			cb_running;
40	int			dump_done_errno;
41	struct netlink_callback	cb;
42	struct mutex		*cb_mutex;
43	struct mutex		cb_def_mutex;
44	void			(*netlink_rcv)(struct sk_buff *skb);
45	int			(*netlink_bind)(struct net *net, int group);
46	void			(*netlink_unbind)(struct net *net, int group);
47	void			(*netlink_release)(struct sock *sk,
48						   unsigned long *groups);
49	struct module		*module;
50
51	struct rhash_head	node;
52	struct rcu_head		rcu;
53	struct work_struct	work;
54};
55
56static inline struct netlink_sock *nlk_sk(struct sock *sk)
57{
58	return container_of(sk, struct netlink_sock, sk);
59}
60
61#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
62
63struct netlink_table {
64	struct rhashtable	hash;
65	struct hlist_head	mc_list;
66	struct listeners __rcu	*listeners;
67	unsigned int		flags;
68	unsigned int		groups;
69	struct mutex		*cb_mutex;
70	struct module		*module;
71	int			(*bind)(struct net *net, int group);
72	void			(*unbind)(struct net *net, int group);
73	void                    (*release)(struct sock *sk,
74					   unsigned long *groups);
75	int			registered;
76};
77
78extern struct netlink_table *nl_table;
79extern rwlock_t nl_table_lock;
80
81#endif
82