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Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -07001/*
2 * connector.h
3 *
Evgeniy Polyakova8018762011-08-25 15:59:06 -07004 * 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -07005 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#ifndef __CONNECTOR_H
23#define __CONNECTOR_H
24
Jaswinder Singh Rajput00bfdda2009-01-15 13:51:26 -080025#include <linux/types.h>
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070026
Matt Helsley9f460802005-11-07 00:59:16 -080027/*
28 * Process Events connector unique ids -- used for message routing
29 */
30#define CN_IDX_PROC 0x1
31#define CN_VAL_PROC 0x1
Steve Frencha2653eb2005-11-10 15:33:38 -080032#define CN_IDX_CIFS 0x2
33#define CN_VAL_CIFS 0x1
Evgeniy Polyakovb6043fc2006-03-23 19:11:58 +030034#define CN_W1_IDX 0x3 /* w1 communication */
35#define CN_W1_VAL 0x1
Michal Januszewskicc54f462007-10-16 01:28:25 -070036#define CN_IDX_V86D 0x4
37#define CN_VAL_V86D_UVESAFB 0x1
Jerome Arbez-Gindre2c203002008-07-29 22:33:33 -070038#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
Evgeniy Polyakovce0d9d72009-01-14 02:05:27 +030039#define CN_DST_IDX 0x6
40#define CN_DST_VAL 0x1
Jonthan Brassowf5db4af2009-06-22 10:12:35 +010041#define CN_IDX_DM 0x7 /* Device Mapper */
42#define CN_VAL_DM_USERSPACE_LOG 0x1
Philipp Reisner35a8a3f2009-11-25 17:50:00 +010043#define CN_IDX_DRBD 0x8
44#define CN_VAL_DRBD 0x1
Ky Srinivasana0a5b672010-12-16 18:35:00 -070045#define CN_KVP_IDX 0x9 /* HyperV KVP */
Matt Helsley9f460802005-11-07 00:59:16 -080046
K. Y. Srinivasanea2c0002011-05-17 15:25:37 -070047#define CN_NETLINK_USERS 10 /* Highest index + 1 */
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070048
49/*
50 * Maximum connector's message size.
51 */
Michal Januszewski3d62a442007-10-16 01:28:24 -070052#define CONNECTOR_MAX_MSG_SIZE 16384
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070053
54/*
55 * idx and val are unique identifiers which
56 * are used for message routing and
57 * must be registered in connector.h for in-kernel usage.
58 */
59
60struct cb_id {
61 __u32 idx;
62 __u32 val;
63};
64
65struct cn_msg {
66 struct cb_id id;
67
68 __u32 seq;
69 __u32 ack;
70
71 __u16 len; /* Length of the following data */
72 __u16 flags;
73 __u8 data[0];
74};
75
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070076#ifdef __KERNEL__
77
Arun Sharma60063492011-07-26 16:09:06 -070078#include <linux/atomic.h>
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070079
80#include <linux/list.h>
81#include <linux/workqueue.h>
82
83#include <net/sock.h>
84
85#define CN_CBQ_NAMELEN 32
86
87struct cn_queue_dev {
88 atomic_t refcnt;
89 unsigned char name[CN_CBQ_NAMELEN];
90
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070091 struct list_head queue_list;
92 spinlock_t queue_lock;
93
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070094 struct sock *nls;
95};
96
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -070097struct cn_callback_id {
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070098 unsigned char name[CN_CBQ_NAMELEN];
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070099 struct cb_id id;
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700100};
101
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700102struct cn_callback_entry {
103 struct list_head callback_entry;
Patrick McHardy04f482f2011-03-28 08:39:36 +0000104 atomic_t refcnt;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700105 struct cn_queue_dev *pdev;
106
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700107 struct cn_callback_id id;
Patrick McHardy04f482f2011-03-28 08:39:36 +0000108 void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700109
Li Zefan6e328142008-01-04 01:59:42 -0800110 u32 seq, group;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700111};
112
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700113struct cn_dev {
114 struct cb_id id;
115
116 u32 seq, groups;
117 struct sock *nls;
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -0700118 void (*input) (struct sk_buff *skb);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700119
120 struct cn_queue_dev *cbdev;
121};
122
Joe Perches008536e2011-02-19 15:45:29 -0800123int cn_add_callback(struct cb_id *id, const char *name,
124 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700125void cn_del_callback(struct cb_id *);
Al Virodd0fc662005-10-07 07:46:04 +0100126int cn_netlink_send(struct cn_msg *, u32, gfp_t);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700127
Joe Perches008536e2011-02-19 15:45:29 -0800128int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
129 struct cb_id *id,
130 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700131void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
Patrick McHardy04f482f2011-03-28 08:39:36 +0000132void cn_queue_release_callback(struct cn_callback_entry *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700133
Joe Perches008536e2011-02-19 15:45:29 -0800134struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700135void cn_queue_free_dev(struct cn_queue_dev *dev);
136
137int cn_cb_equal(struct cb_id *, struct cb_id *);
138
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700139#endif /* __KERNEL__ */
140#endif /* __CONNECTOR_H */