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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 */
K. Y. Srinivasan4f03a2c2012-01-27 15:55:57 -080046#define CN_KVP_VAL 0x1 /* queries from the kernel */
Matt Helsley9f460802005-11-07 00:59:16 -080047
K. Y. Srinivasanea2c0002011-05-17 15:25:37 -070048#define CN_NETLINK_USERS 10 /* Highest index + 1 */
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070049
50/*
51 * Maximum connector's message size.
52 */
Michal Januszewski3d62a442007-10-16 01:28:24 -070053#define CONNECTOR_MAX_MSG_SIZE 16384
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070054
55/*
56 * idx and val are unique identifiers which
57 * are used for message routing and
58 * must be registered in connector.h for in-kernel usage.
59 */
60
61struct cb_id {
62 __u32 idx;
63 __u32 val;
64};
65
66struct cn_msg {
67 struct cb_id id;
68
69 __u32 seq;
70 __u32 ack;
71
72 __u16 len; /* Length of the following data */
73 __u16 flags;
74 __u8 data[0];
75};
76
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070077#ifdef __KERNEL__
78
Arun Sharma60063492011-07-26 16:09:06 -070079#include <linux/atomic.h>
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070080
81#include <linux/list.h>
82#include <linux/workqueue.h>
83
84#include <net/sock.h>
85
86#define CN_CBQ_NAMELEN 32
87
88struct cn_queue_dev {
89 atomic_t refcnt;
90 unsigned char name[CN_CBQ_NAMELEN];
91
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070092 struct list_head queue_list;
93 spinlock_t queue_lock;
94
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070095 struct sock *nls;
96};
97
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -070098struct cn_callback_id {
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070099 unsigned char name[CN_CBQ_NAMELEN];
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700100 struct cb_id id;
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700101};
102
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700103struct cn_callback_entry {
104 struct list_head callback_entry;
Patrick McHardy04f482f2011-03-28 08:39:36 +0000105 atomic_t refcnt;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700106 struct cn_queue_dev *pdev;
107
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700108 struct cn_callback_id id;
Patrick McHardy04f482f2011-03-28 08:39:36 +0000109 void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700110
Li Zefan6e328142008-01-04 01:59:42 -0800111 u32 seq, group;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700112};
113
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700114struct cn_dev {
115 struct cb_id id;
116
117 u32 seq, groups;
118 struct sock *nls;
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -0700119 void (*input) (struct sk_buff *skb);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700120
121 struct cn_queue_dev *cbdev;
122};
123
Joe Perches008536e2011-02-19 15:45:29 -0800124int cn_add_callback(struct cb_id *id, const char *name,
125 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700126void cn_del_callback(struct cb_id *);
Al Virodd0fc662005-10-07 07:46:04 +0100127int cn_netlink_send(struct cn_msg *, u32, gfp_t);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700128
Joe Perches008536e2011-02-19 15:45:29 -0800129int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
130 struct cb_id *id,
131 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700132void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
Patrick McHardy04f482f2011-03-28 08:39:36 +0000133void cn_queue_release_callback(struct cn_callback_entry *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700134
Joe Perches008536e2011-02-19 15:45:29 -0800135struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700136void cn_queue_free_dev(struct cn_queue_dev *dev);
137
138int cn_cb_equal(struct cb_id *, struct cb_id *);
139
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700140#endif /* __KERNEL__ */
141#endif /* __CONNECTOR_H */