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/*
* 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 */
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