[linux-2.6-block.git] / net / netlink / af_netlink.h

#ifndef _AF_NETLINK_H
#define _AF_NETLINK_H

#include <linux/rhashtable.h>
#include <linux/atomic.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			bound;
	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;
	struct rcu_head		rcu;
};

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

static inline bool netlink_skb_is_mmaped(const struct sk_buff *skb)
{
#ifdef CONFIG_NETLINK_MMAP
	return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
#else
	return false;
#endif /* CONFIG_NETLINK_MMAP */
}

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;

#endif
Commit	Line	Data
0f29c768 AV	1	#ifndef _AF_NETLINK_H
	2	#define _AF_NETLINK_H
	3
e341694e	4	#include <linux/rhashtable.h>
ee1c2442	5	#include <linux/atomic.h>
0f29c768 AV	6	#include <net/sock.h>
	7
	8	#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
	9	#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
	10
ccdfcc39 PM	11	struct netlink_ring {
	12	void **pg_vec;
	13	unsigned int head;
	14	unsigned int frames_per_block;
	15	unsigned int frame_size;
	16	unsigned int frame_max;
	17
	18	unsigned int pg_vec_order;
	19	unsigned int pg_vec_pages;
	20	unsigned int pg_vec_len;
	21
	22	atomic_t pending;
	23	};
	24
0f29c768 AV	25	struct netlink_sock {
	26	/* struct sock has to be the first member of netlink_sock */
	27	struct sock sk;
	28	u32 portid;
	29	u32 dst_portid;
	30	u32 dst_group;
	31	u32 flags;
	32	u32 subscriptions;
	33	u32 ngroups;
	34	unsigned long *groups;
	35	unsigned long state;
9063e21f	36	size_t max_recvmsg_len;
0f29c768	37	wait_queue_head_t wait;
da314c99	38	bool bound;
16b304f3 PS	39	bool cb_running;
16b304f3 PS	40	struct netlink_callback cb;
0f29c768 AV	41	struct mutex *cb_mutex;
	42	struct mutex cb_def_mutex;
	43	void (netlink_rcv)(struct sk_buff skb);
023e2cfa JB	44	int (netlink_bind)(struct net net, int group);
023e2cfa JB	45	void (netlink_unbind)(struct net net, int group);
0f29c768	46	struct module *module;
ccdfcc39 PM	47	#ifdef CONFIG_NETLINK_MMAP
	48	struct mutex pg_vec_lock;
	49	struct netlink_ring rx_ring;
	50	struct netlink_ring tx_ring;
	51	atomic_t mapped;
	52	#endif /* CONFIG_NETLINK_MMAP */
e341694e TG	53
e341694e TG	54	struct rhash_head node;
21e4902a	55	struct rcu_head rcu;
0f29c768 AV	56	};
	57
	58	static inline struct netlink_sock nlk_sk(struct sock sk)
	59	{
	60	return container_of(sk, struct netlink_sock, sk);
	61	}
	62
1853c949 DB	63	static inline bool netlink_skb_is_mmaped(const struct sk_buff *skb)
	64	{
	65	#ifdef CONFIG_NETLINK_MMAP
	66	return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
	67	#else
	68	return false;
	69	#endif /* CONFIG_NETLINK_MMAP */
	70	}
	71
0f29c768	72	struct netlink_table {
e341694e	73	struct rhashtable hash;
0f29c768 AV	74	struct hlist_head mc_list;
	75	struct listeners __rcu *listeners;
	76	unsigned int flags;
	77	unsigned int groups;
	78	struct mutex *cb_mutex;
	79	struct module *module;
023e2cfa JB	80	int (bind)(struct net net, int group);
023e2cfa JB	81	void (unbind)(struct net net, int group);
da12c90e	82	bool (compare)(struct net net, struct sock *sock);
0f29c768 AV	83	int registered;
	84	};
	85
	86	extern struct netlink_table *nl_table;
	87	extern rwlock_t nl_table_lock;
	88
	89	#endif