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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
25#include <asm/types.h>
26
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
Matt Helsley9f460802005-11-07 00:59:16 -080037
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -070038#define CN_NETLINK_USERS 1
39
40/*
41 * Maximum connector's message size.
42 */
43#define CONNECTOR_MAX_MSG_SIZE 1024
44
45/*
46 * idx and val are unique identifiers which
47 * are used for message routing and
48 * must be registered in connector.h for in-kernel usage.
49 */
50
51struct cb_id {
52 __u32 idx;
53 __u32 val;
54};
55
56struct cn_msg {
57 struct cb_id id;
58
59 __u32 seq;
60 __u32 ack;
61
62 __u16 len; /* Length of the following data */
63 __u16 flags;
64 __u8 data[0];
65};
66
67/*
68 * Notify structure - requests notification about
69 * registering/unregistering idx/val in range [first, first+range].
70 */
71struct cn_notify_req {
72 __u32 first;
73 __u32 range;
74};
75
76/*
77 * Main notification control message
78 * *_notify_num - number of appropriate cn_notify_req structures after
79 * this struct.
80 * group - notification receiver's idx.
81 * len - total length of the attached data.
82 */
83struct cn_ctl_msg {
84 __u32 idx_notify_num;
85 __u32 val_notify_num;
86 __u32 group;
87 __u32 len;
88 __u8 data[0];
89};
90
91#ifdef __KERNEL__
92
93#include <asm/atomic.h>
94
95#include <linux/list.h>
96#include <linux/workqueue.h>
97
98#include <net/sock.h>
99
100#define CN_CBQ_NAMELEN 32
101
102struct cn_queue_dev {
103 atomic_t refcnt;
104 unsigned char name[CN_CBQ_NAMELEN];
105
106 struct workqueue_struct *cn_queue;
107
108 struct list_head queue_list;
109 spinlock_t queue_lock;
110
111 int netlink_groups;
112 struct sock *nls;
113};
114
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700115struct cn_callback_id {
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700116 unsigned char name[CN_CBQ_NAMELEN];
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700117 struct cb_id id;
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700118};
119
120struct cn_callback_data {
121 void (*destruct_data) (void *);
122 void *ddata;
123
124 void *callback_priv;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700125 void (*callback) (void *);
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700126
127 void *free;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700128};
129
130struct cn_callback_entry {
131 struct list_head callback_entry;
132 struct cn_callback *cb;
133 struct work_struct work;
134 struct cn_queue_dev *pdev;
135
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700136 struct cn_callback_id id;
137 struct cn_callback_data data;
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700138
139 int seq, group;
140 struct sock *nls;
141};
142
143struct cn_ctl_entry {
144 struct list_head notify_entry;
145 struct cn_ctl_msg *msg;
146};
147
148struct cn_dev {
149 struct cb_id id;
150
151 u32 seq, groups;
152 struct sock *nls;
153 void (*input) (struct sock * sk, int len);
154
155 struct cn_queue_dev *cbdev;
156};
157
158int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
159void cn_del_callback(struct cb_id *);
Al Virodd0fc662005-10-07 07:46:04 +0100160int cn_netlink_send(struct cn_msg *, u32, gfp_t);
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700161
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700162int 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 -0700163void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
164
165struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
166void cn_queue_free_dev(struct cn_queue_dev *dev);
167
168int cn_cb_equal(struct cb_id *, struct cb_id *);
169
Evgeniy Polyakovacd042b2005-09-26 15:06:50 -0700170void cn_queue_wrapper(void *data);
171
Evgeniy Polyakov7672d0b2005-09-11 19:15:07 -0700172extern int cn_already_initialized;
173
174#endif /* __KERNEL__ */
175#endif /* __CONNECTOR_H */