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 <net/sock.h>
 8
 9/* flags */
10enum {
11	NETLINK_F_KERNEL_SOCKET,
12	NETLINK_F_RECV_PKTINFO,
13	NETLINK_F_BROADCAST_SEND_ERROR,
14	NETLINK_F_RECV_NO_ENOBUFS,
15	NETLINK_F_LISTEN_ALL_NSID,
16	NETLINK_F_CAP_ACK,
17	NETLINK_F_EXT_ACK,
18	NETLINK_F_STRICT_CHK,
19};
20
21#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
22#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
23
 
 
 
 
 
 
 
 
 
 
 
 
 
 
24struct netlink_sock {
25	/* struct sock has to be the first member of netlink_sock */
26	struct sock		sk;
27	unsigned long		flags;
28	u32			portid;
29	u32			dst_portid;
30	u32			dst_group;
 
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			bound;
38	bool			cb_running;
39	int			dump_done_errno;
40	struct netlink_callback	cb;
41	struct mutex		nl_cb_mutex;
42
43	void			(*netlink_rcv)(struct sk_buff *skb);
44	int			(*netlink_bind)(struct net *net, int group);
45	void			(*netlink_unbind)(struct net *net, int group);
46	void			(*netlink_release)(struct sock *sk,
47						   unsigned long *groups);
48	struct module		*module;
49
50	struct rhash_head	node;
51	struct rcu_head		rcu;
 
 
 
52};
53
54static inline struct netlink_sock *nlk_sk(struct sock *sk)
55{
56	return container_of(sk, struct netlink_sock, sk);
57}
58
59#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
 
 
 
 
 
 
 
 
 
 
 
60
61struct netlink_table {
62	struct rhashtable	hash;
63	struct hlist_head	mc_list;
64	struct listeners __rcu	*listeners;
65	unsigned int		flags;
66	unsigned int		groups;
67	struct mutex		*cb_mutex;
68	struct module		*module;
69	int			(*bind)(struct net *net, int group);
70	void			(*unbind)(struct net *net, int group);
71	void                    (*release)(struct sock *sk,
72					   unsigned long *groups);
73	int			registered;
74};
75
76extern struct netlink_table *nl_table;
77extern rwlock_t nl_table_lock;
78
79#endif

 
 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
 9struct 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
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			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	void			(*netlink_bind)(int group);
 
 
 
42	struct module		*module;
43#ifdef CONFIG_NETLINK_MMAP
44	struct mutex		pg_vec_lock;
45	struct netlink_ring	rx_ring;
46	struct netlink_ring	tx_ring;
47	atomic_t		mapped;
48#endif /* CONFIG_NETLINK_MMAP */
49};
50
51static inline struct netlink_sock *nlk_sk(struct sock *sk)
52{
53	return container_of(sk, struct netlink_sock, sk);
54}
55
56struct nl_portid_hash {
57	struct hlist_head	*table;
58	unsigned long		rehash_time;
59
60	unsigned int		mask;
61	unsigned int		shift;
62
63	unsigned int		entries;
64	unsigned int		max_shift;
65
66	u32			rnd;
67};
68
69struct netlink_table {
70	struct nl_portid_hash	hash;
71	struct hlist_head	mc_list;
72	struct listeners __rcu	*listeners;
73	unsigned int		flags;
74	unsigned int		groups;
75	struct mutex		*cb_mutex;
76	struct module		*module;
77	void			(*bind)(int group);
78	bool			(*compare)(struct net *net, struct sock *sock);
 
 
79	int			registered;
80};
81
82extern struct netlink_table *nl_table;
83extern rwlock_t nl_table_lock;
84
85#endif