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/* 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 __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_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 /* __CONNECTOR_H */