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/* 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