[mirror_ubuntu-bionic-kernel.git] / net / netlink / af_netlink.h

#ifndef _AF_NETLINK_H
#define _AF_NETLINK_H

#include <linux/rhashtable.h>
#include <net/sock.h>

#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)
#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))

struct netlink_ring {
	void			**pg_vec;
	unsigned int		head;
	unsigned int		frames_per_block;
	unsigned int		frame_size;
	unsigned int		frame_max;

	unsigned int		pg_vec_order;
	unsigned int		pg_vec_pages;
	unsigned int		pg_vec_len;

	atomic_t		pending;
};

struct netlink_sock {
	/* struct sock has to be the first member of netlink_sock */
	struct sock		sk;
	u32			portid;
	u32			dst_portid;
	u32			dst_group;
	u32			flags;
	u32			subscriptions;
	u32			ngroups;
	unsigned long		*groups;
	unsigned long		state;
	size_t			max_recvmsg_len;
	wait_queue_head_t	wait;
	bool			cb_running;
	struct netlink_callback	cb;
	struct mutex		*cb_mutex;
	struct mutex		cb_def_mutex;
	void			(*netlink_rcv)(struct sk_buff *skb);
	int			(*netlink_bind)(struct net *net, int group);
	void			(*netlink_unbind)(struct net *net, int group);
	struct module		*module;
#ifdef CONFIG_NETLINK_MMAP
	struct mutex		pg_vec_lock;
	struct netlink_ring	rx_ring;
	struct netlink_ring	tx_ring;
	atomic_t		mapped;
#endif /* CONFIG_NETLINK_MMAP */

	struct rhash_head	node;
};

static inline struct netlink_sock *nlk_sk(struct sock *sk)
{
	return container_of(sk, struct netlink_sock, sk);
}

struct netlink_table {
	struct rhashtable	hash;
	struct hlist_head	mc_list;
	struct listeners __rcu	*listeners;
	unsigned int		flags;
	unsigned int		groups;
	struct mutex		*cb_mutex;
	struct module		*module;
	int			(*bind)(struct net *net, int group);
	void			(*unbind)(struct net *net, int group);
	bool			(*compare)(struct net *net, struct sock *sock);
	int			registered;
};

extern struct netlink_table *nl_table;
extern rwlock_t nl_table_lock;
extern struct mutex nl_sk_hash_lock;

#endif
Commit	Line	Data
0f29c768 AV	1	#ifndef _AF_NETLINK_H
	2	#define _AF_NETLINK_H
	3
e341694e	4	#include <linux/rhashtable.h>
0f29c768 AV	5	#include <net/sock.h>
	6
	7	#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
	8	#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
	9
ccdfcc39 PM	10	struct netlink_ring {
	11	void **pg_vec;
	12	unsigned int head;
	13	unsigned int frames_per_block;
	14	unsigned int frame_size;
	15	unsigned int frame_max;
	16
	17	unsigned int pg_vec_order;
	18	unsigned int pg_vec_pages;
	19	unsigned int pg_vec_len;
	20
	21	atomic_t pending;
	22	};
	23
0f29c768 AV	24	struct netlink_sock {
	25	/* struct sock has to be the first member of netlink_sock */
	26	struct sock sk;
	27	u32 portid;
	28	u32 dst_portid;
	29	u32 dst_group;
	30	u32 flags;
	31	u32 subscriptions;
	32	u32 ngroups;
	33	unsigned long *groups;
	34	unsigned long state;
9063e21f	35	size_t max_recvmsg_len;
0f29c768	36	wait_queue_head_t wait;
16b304f3 PS	37	bool cb_running;
16b304f3 PS	38	struct netlink_callback cb;
0f29c768 AV	39	struct mutex *cb_mutex;
	40	struct mutex cb_def_mutex;
	41	void (netlink_rcv)(struct sk_buff skb);
023e2cfa JB	42	int (netlink_bind)(struct net net, int group);
023e2cfa JB	43	void (netlink_unbind)(struct net net, int group);
0f29c768	44	struct module *module;
ccdfcc39 PM	45	#ifdef CONFIG_NETLINK_MMAP
	46	struct mutex pg_vec_lock;
	47	struct netlink_ring rx_ring;
	48	struct netlink_ring tx_ring;
	49	atomic_t mapped;
	50	#endif /* CONFIG_NETLINK_MMAP */
e341694e TG	51
e341694e TG	52	struct rhash_head node;
0f29c768 AV	53	};
	54
	55	static inline struct netlink_sock nlk_sk(struct sock sk)
	56	{
	57	return container_of(sk, struct netlink_sock, sk);
	58	}
	59
0f29c768	60	struct netlink_table {
e341694e	61	struct rhashtable hash;
0f29c768 AV	62	struct hlist_head mc_list;
	63	struct listeners __rcu *listeners;
	64	unsigned int flags;
	65	unsigned int groups;
	66	struct mutex *cb_mutex;
	67	struct module *module;
023e2cfa JB	68	int (bind)(struct net net, int group);
023e2cfa JB	69	void (unbind)(struct net net, int group);
da12c90e	70	bool (compare)(struct net net, struct sock *sock);
0f29c768 AV	71	int registered;
	72	};
	73
	74	extern struct netlink_table *nl_table;
	75	extern rwlock_t nl_table_lock;
6c8f7e70	76	extern struct mutex nl_sk_hash_lock;
0f29c768 AV	77
0f29c768 AV	78	#endif