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name : connector.h
 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * 	connector.h
 * 
 * 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
 * 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 _UAPI__CONNECTOR_H
#define _UAPI__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_VAL_DM_USERSPACE_LOG		0x1
#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_VSS_IDX			0xA     /* HyperV VSS */
#define CN_VSS_VAL			0x1     /* queries from the kernel */


#define CN_NETLINK_USERS		11	/* Highest index + 1 */

/*
 * Maximum connector's message size.
 */
#define CONNECTOR_MAX_MSG_SIZE		16384

/*
 * 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[];
};

#endif /* _UAPI__CONNECTOR_H */
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