Linux kernel mirror (for testing)
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1/*
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
30#define CN_NETLINK_USERS 1
31
32/*
33 * Maximum connector's message size.
34 */
35#define CONNECTOR_MAX_MSG_SIZE 1024
36
37/*
38 * idx and val are unique identifiers which
39 * are used for message routing and
40 * must be registered in connector.h for in-kernel usage.
41 */
42
43struct cb_id {
44 __u32 idx;
45 __u32 val;
46};
47
48struct cn_msg {
49 struct cb_id id;
50
51 __u32 seq;
52 __u32 ack;
53
54 __u16 len; /* Length of the following data */
55 __u16 flags;
56 __u8 data[0];
57};
58
59/*
60 * Notify structure - requests notification about
61 * registering/unregistering idx/val in range [first, first+range].
62 */
63struct cn_notify_req {
64 __u32 first;
65 __u32 range;
66};
67
68/*
69 * Main notification control message
70 * *_notify_num - number of appropriate cn_notify_req structures after
71 * this struct.
72 * group - notification receiver's idx.
73 * len - total length of the attached data.
74 */
75struct cn_ctl_msg {
76 __u32 idx_notify_num;
77 __u32 val_notify_num;
78 __u32 group;
79 __u32 len;
80 __u8 data[0];
81};
82
83#ifdef __KERNEL__
84
85#include <asm/atomic.h>
86
87#include <linux/list.h>
88#include <linux/workqueue.h>
89
90#include <net/sock.h>
91
92#define CN_CBQ_NAMELEN 32
93
94struct cn_queue_dev {
95 atomic_t refcnt;
96 unsigned char name[CN_CBQ_NAMELEN];
97
98 struct workqueue_struct *cn_queue;
99
100 struct list_head queue_list;
101 spinlock_t queue_lock;
102
103 int netlink_groups;
104 struct sock *nls;
105};
106
107struct cn_callback_id {
108 unsigned char name[CN_CBQ_NAMELEN];
109 struct cb_id id;
110};
111
112struct cn_callback_data {
113 void (*destruct_data) (void *);
114 void *ddata;
115
116 void *callback_priv;
117 void (*callback) (void *);
118
119 void *free;
120};
121
122struct cn_callback_entry {
123 struct list_head callback_entry;
124 struct cn_callback *cb;
125 struct work_struct work;
126 struct cn_queue_dev *pdev;
127
128 struct cn_callback_id id;
129 struct cn_callback_data data;
130
131 int seq, group;
132 struct sock *nls;
133};
134
135struct cn_ctl_entry {
136 struct list_head notify_entry;
137 struct cn_ctl_msg *msg;
138};
139
140struct cn_dev {
141 struct cb_id id;
142
143 u32 seq, groups;
144 struct sock *nls;
145 void (*input) (struct sock * sk, int len);
146
147 struct cn_queue_dev *cbdev;
148};
149
150int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
151void cn_del_callback(struct cb_id *);
152int cn_netlink_send(struct cn_msg *, u32, gfp_t);
153
154int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
155void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
156
157struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
158void cn_queue_free_dev(struct cn_queue_dev *dev);
159
160int cn_cb_equal(struct cb_id *, struct cb_id *);
161
162void cn_queue_wrapper(void *data);
163
164extern int cn_already_initialized;
165
166#endif /* __KERNEL__ */
167#endif /* __CONNECTOR_H */