tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 {
108 unsigned char name[CN_CBQ_NAMELEN];
109
110 struct cb_id id;
111 void (*callback) (void *);
112 void *priv;
113};
114
115struct cn_callback_entry {
116 struct list_head callback_entry;
117 struct cn_callback *cb;
118 struct work_struct work;
119 struct cn_queue_dev *pdev;
120
121 void (*destruct_data) (void *);
122 void *ddata;
123
124 int seq, group;
125 struct sock *nls;
126};
127
128struct cn_ctl_entry {
129 struct list_head notify_entry;
130 struct cn_ctl_msg *msg;
131};
132
133struct cn_dev {
134 struct cb_id id;
135
136 u32 seq, groups;
137 struct sock *nls;
138 void (*input) (struct sock * sk, int len);
139
140 struct cn_queue_dev *cbdev;
141};
142
143int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
144void cn_del_callback(struct cb_id *);
145int cn_netlink_send(struct cn_msg *, u32, int);
146
147int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb);
148void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
149
150struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
151void cn_queue_free_dev(struct cn_queue_dev *dev);
152
153int cn_cb_equal(struct cb_id *, struct cb_id *);
154
155extern int cn_already_initialized;
156
157#endif /* __KERNEL__ */
158#endif /* __CONNECTOR_H */