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* connector.h
* 2004-2005 Copyright (c) Evgeniy Polyakov <>
* 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
* 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 <linux/types.h>
* Process Events connector unique ids -- used for message routing
#define CN_IDX_PROC 0x1
#define CN_VAL_PROC 0x1
#define CN_IDX_CIFS 0x2
#define CN_VAL_CIFS 0x1
#define CN_W1_IDX 0x3 /* w1 communication */
#define CN_W1_VAL 0x1
#define CN_IDX_V86D 0x4
#define CN_VAL_V86D_UVESAFB 0x1
#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
#define CN_DST_IDX 0x6
#define CN_DST_VAL 0x1
#define CN_IDX_DM 0x7 /* Device Mapper */
#define CN_IDX_DRBD 0x8
#define CN_VAL_DRBD 0x1
#define CN_KVP_IDX 0x9 /* HyperV KVP */
#define CN_KVP_VAL 0x1 /* queries from the kernel */
#define CN_NETLINK_USERS 10 /* Highest index + 1 */
* Maximum connector's message size.
* 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];
#ifdef __KERNEL__
#include <linux/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 list_head queue_list;
spinlock_t queue_lock;
struct sock *nls;
struct cn_callback_id {
unsigned char name[CN_CBQ_NAMELEN];
struct cb_id id;
struct cn_callback_entry {
struct list_head callback_entry;
atomic_t refcnt;
struct cn_queue_dev *pdev;
struct cn_callback_id id;
void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
u32 seq, group;
struct cn_dev {
struct cb_id id;
u32 seq, groups;
struct sock *nls;
void (*input) (struct sk_buff *skb);
struct cn_queue_dev *cbdev;
int cn_add_callback(struct cb_id *id, const char *name,
void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
void cn_del_callback(struct cb_id *);
int cn_netlink_send(struct cn_msg *, u32, gfp_t);
int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
struct cb_id *id,
void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
void cn_queue_release_callback(struct cn_callback_entry *);
struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
void cn_queue_free_dev(struct cn_queue_dev *dev);
int cn_cb_equal(struct cb_id *, struct cb_id *);
#endif /* __KERNEL__ */
#endif /* __CONNECTOR_H */