connector.h 3.4 KB
Newer Older
E
Evgeniy Polyakov 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
/*
 * 	connector.h
 * 
 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 * All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __CONNECTOR_H
#define __CONNECTOR_H

#include <asm/types.h>

#define CN_IDX_CONNECTOR		0xffffffff
#define CN_VAL_CONNECTOR		0xffffffff

#define CN_NETLINK_USERS		1

/*
 * Maximum connector's message size.
 */
#define CONNECTOR_MAX_MSG_SIZE 	1024

/*
 * idx and val are unique identifiers which 
 * are used for message routing and 
 * must be registered in connector.h for in-kernel usage.
 */

struct cb_id {
	__u32 idx;
	__u32 val;
};

struct cn_msg {
	struct cb_id id;

	__u32 seq;
	__u32 ack;

	__u16 len;		/* Length of the following data */
	__u16 flags;
	__u8 data[0];
};

/*
 * Notify structure - requests notification about
 * registering/unregistering idx/val in range [first, first+range].
 */
struct cn_notify_req {
	__u32 first;
	__u32 range;
};

/*
 * Main notification control message
 * *_notify_num 	- number of appropriate cn_notify_req structures after 
 *				this struct.
 * group 		- notification receiver's idx.
 * len 			- total length of the attached data.
 */
struct cn_ctl_msg {
	__u32 idx_notify_num;
	__u32 val_notify_num;
	__u32 group;
	__u32 len;
	__u8 data[0];
};

#ifdef __KERNEL__

#include <asm/atomic.h>

#include <linux/list.h>
#include <linux/workqueue.h>

#include <net/sock.h>

#define CN_CBQ_NAMELEN		32

struct cn_queue_dev {
	atomic_t refcnt;
	unsigned char name[CN_CBQ_NAMELEN];

	struct workqueue_struct *cn_queue;

	struct list_head queue_list;
	spinlock_t queue_lock;

	int netlink_groups;
	struct sock *nls;
};

struct cn_callback {
	unsigned char name[CN_CBQ_NAMELEN];

	struct cb_id id;
	void (*callback) (void *);
	void *priv;
};

struct cn_callback_entry {
	struct list_head callback_entry;
	struct cn_callback *cb;
	struct work_struct work;
	struct cn_queue_dev *pdev;

	void (*destruct_data) (void *);
	void *ddata;

	int seq, group;
	struct sock *nls;
};

struct cn_ctl_entry {
	struct list_head notify_entry;
	struct cn_ctl_msg *msg;
};

struct cn_dev {
	struct cb_id id;

	u32 seq, groups;
	struct sock *nls;
	void (*input) (struct sock * sk, int len);

	struct cn_queue_dev *cbdev;
};

int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
void cn_del_callback(struct cb_id *);
int cn_netlink_send(struct cn_msg *, u32, int);

int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb);
void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);

struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
void cn_queue_free_dev(struct cn_queue_dev *dev);

int cn_cb_equal(struct cb_id *, struct cb_id *);

extern int cn_already_initialized;

#endif				/* __KERNEL__ */
#endif				/* __CONNECTOR_H */