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Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -07001/*
2 * connector.h
3 *
4 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
5 * 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
27#define CN_IDX_CONNECTOR 0xffffffff
28#define CN_VAL_CONNECTOR 0xffffffff
29
Matt Helsley9f460802005-11-07 00:59:16 -080030/*
31 * Process Events connector unique ids -- used for message routing
32 */
33#define CN_IDX_PROC 0x1
34#define CN_VAL_PROC 0x1
Steve Frencha2653eb2005-11-10 15:33:38 -080035#define CN_IDX_CIFS 0x2
36#define CN_VAL_CIFS 0x1
Evgeniy Polyakovb6043fc2006-03-23 19:11:58 +030037#define CN_W1_IDX 0x3 /* w1 communication */
38#define CN_W1_VAL 0x1
Michal Januszewskicc54f462007-10-16 01:28:25 -070039#define CN_IDX_V86D 0x4
40#define CN_VAL_V86D_UVESAFB 0x1
Jerome Arbez-Gindre2c203002008-07-29 22:33:33 -070041#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
Evgeniy Polyakovce0d9d72009-01-14 02:05:27 +030042#define CN_DST_IDX 0x6
43#define CN_DST_VAL 0x1
Jonthan Brassowf5db4af2009-06-22 10:12:35 +010044#define CN_IDX_DM 0x7 /* Device Mapper */
45#define CN_VAL_DM_USERSPACE_LOG 0x1
Matt Helsley9f460802005-11-07 00:59:16 -080046
Jonthan Brassowf5db4af2009-06-22 10:12:35 +010047#define CN_NETLINK_USERS 8
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
76/*
77 * Notify structure - requests notification about
78 * registering/unregistering idx/val in range [first, first+range].
79 */
80struct cn_notify_req {
81 __u32 first;
82 __u32 range;
83};
84
85/*
86 * Main notification control message
87 * *_notify_num - number of appropriate cn_notify_req structures after
88 * this struct.
89 * group - notification receiver's idx.
90 * len - total length of the attached data.
91 */
92struct cn_ctl_msg {
93 __u32 idx_notify_num;
94 __u32 val_notify_num;
95 __u32 group;
96 __u32 len;
97 __u8 data[0];
98};
99
100#ifdef __KERNEL__
101
102#include <asm/atomic.h>
103
104#include <linux/list.h>
105#include <linux/workqueue.h>
106
107#include <net/sock.h>
108
109#define CN_CBQ_NAMELEN 32
110
111struct cn_queue_dev {
112 atomic_t refcnt;
113 unsigned char name[CN_CBQ_NAMELEN];
114
115 struct workqueue_struct *cn_queue;
Frederic Weisbecker1a5645b2009-02-02 23:22:04 -0800116 /* Sent to kevent to create cn_queue only when needed */
117 struct work_struct wq_creation;
118 /* Tell if the wq_creation job is pending/completed */
119 atomic_t wq_requested;
120 /* Wait for cn_queue to be created */
121 wait_queue_head_t wq_created;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700122
123 struct list_head queue_list;
124 spinlock_t queue_lock;
125
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700126 struct sock *nls;
127};
128
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700129struct cn_callback_id {
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700130 unsigned char name[CN_CBQ_NAMELEN];
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700131 struct cb_id id;
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700132};
133
134struct cn_callback_data {
135 void (*destruct_data) (void *);
136 void *ddata;
137
138 void *callback_priv;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700139 void (*callback) (void *);
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700140
141 void *free;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700142};
143
144struct cn_callback_entry {
145 struct list_head callback_entry;
Evgeniy Polyakova240d9f2006-12-18 01:53:58 -0800146 struct work_struct work;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700147 struct cn_queue_dev *pdev;
148
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700149 struct cn_callback_id id;
150 struct cn_callback_data data;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700151
Li Zefan6e328142008-01-04 01:59:42 -0800152 u32 seq, group;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700153};
154
155struct cn_ctl_entry {
156 struct list_head notify_entry;
157 struct cn_ctl_msg *msg;
158};
159
160struct cn_dev {
161 struct cb_id id;
162
163 u32 seq, groups;
164 struct sock *nls;
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -0700165 void (*input) (struct sk_buff *skb);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700166
167 struct cn_queue_dev *cbdev;
168};
169
170int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
171void cn_del_callback(struct cb_id *);
Al Virodd0fc662005-10-07 07:46:04 +0100172int cn_netlink_send(struct cn_msg *, u32, gfp_t);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700173
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700174int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700175void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
176
Frederic Weisbecker1a5645b2009-02-02 23:22:04 -0800177int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);
178
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700179struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
180void cn_queue_free_dev(struct cn_queue_dev *dev);
181
182int cn_cb_equal(struct cb_id *, struct cb_id *);
183
David Howellsc4028952006-11-22 14:57:56 +0000184void cn_queue_wrapper(struct work_struct *work);
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700185
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700186#endif /* __KERNEL__ */
187#endif /* __CONNECTOR_H */