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
19#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
20#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))
21
22struct netlink_sock {
23	/* struct sock has to be the first member of netlink_sock */
24	struct sock		sk;
 
25	u32			portid;
26	u32			dst_portid;
27	u32			dst_group;
28	u32			flags;
29	u32			subscriptions;
30	u32			ngroups;
31	unsigned long		*groups;
32	unsigned long		state;
33	size_t			max_recvmsg_len;
34	wait_queue_head_t	wait;
35	bool			bound;
36	bool			cb_running;
37	int			dump_done_errno;
38	struct netlink_callback	cb;
39	struct mutex		*cb_mutex;
40	struct mutex		cb_def_mutex;
41	void			(*netlink_rcv)(struct sk_buff *skb);
42	int			(*netlink_bind)(struct net *net, int group);
43	void			(*netlink_unbind)(struct net *net, int group);
 
 
44	struct module		*module;
45
46	struct rhash_head	node;
47	struct rcu_head		rcu;
48	struct work_struct	work;
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 netlink_table {
57	struct rhashtable	hash;
58	struct hlist_head	mc_list;
59	struct listeners __rcu	*listeners;
60	unsigned int		flags;
61	unsigned int		groups;
62	struct mutex		*cb_mutex;
63	struct module		*module;
64	int			(*bind)(struct net *net, int group);
65	void			(*unbind)(struct net *net, int group);
66	bool			(*compare)(struct net *net, struct sock *sock);
 
67	int			registered;
68};
69
70extern struct netlink_table *nl_table;
71extern rwlock_t nl_table_lock;
72
73#endif