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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 <linux/types.h>
26
27#define CN_IDX_CONNECTOR 0xffffffff
28#define CN_VAL_CONNECTOR 0xffffffff
29
30/*
31 * Process Events connector unique ids -- used for message routing
32 */
33#define CN_IDX_PROC 0x1
34#define CN_VAL_PROC 0x1
35#define CN_IDX_CIFS 0x2
36#define CN_VAL_CIFS 0x1
37#define CN_W1_IDX 0x3 /* w1 communication */
38#define CN_W1_VAL 0x1
39#define CN_IDX_V86D 0x4
40#define CN_VAL_V86D_UVESAFB 0x1
41#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
42#define CN_DST_IDX 0x6
43#define CN_DST_VAL 0x1
44
45#define CN_NETLINK_USERS 7
46
47/*
48 * Maximum connector's message size.
49 */
50#define CONNECTOR_MAX_MSG_SIZE 16384
51
52/*
53 * idx and val are unique identifiers which
54 * are used for message routing and
55 * must be registered in connector.h for in-kernel usage.
56 */
57
58struct cb_id {
59 __u32 idx;
60 __u32 val;
61};
62
63struct cn_msg {
64 struct cb_id id;
65
66 __u32 seq;
67 __u32 ack;
68
69 __u16 len; /* Length of the following data */
70 __u16 flags;
71 __u8 data[0];
72};
73
74/*
75 * Notify structure - requests notification about
76 * registering/unregistering idx/val in range [first, first+range].
77 */
78struct cn_notify_req {
79 __u32 first;
80 __u32 range;
81};
82
83/*
84 * Main notification control message
85 * *_notify_num - number of appropriate cn_notify_req structures after
86 * this struct.
87 * group - notification receiver's idx.
88 * len - total length of the attached data.
89 */
90struct cn_ctl_msg {
91 __u32 idx_notify_num;
92 __u32 val_notify_num;
93 __u32 group;
94 __u32 len;
95 __u8 data[0];
96};
97
98#ifdef __KERNEL__
99
100#include <asm/atomic.h>
101
102#include <linux/list.h>
103#include <linux/workqueue.h>
104
105#include <net/sock.h>
106
107#define CN_CBQ_NAMELEN 32
108
109struct cn_queue_dev {
110 atomic_t refcnt;
111 unsigned char name[CN_CBQ_NAMELEN];
112
113 struct workqueue_struct *cn_queue;
114 /* Sent to kevent to create cn_queue only when needed */
115 struct work_struct wq_creation;
116 /* Tell if the wq_creation job is pending/completed */
117 atomic_t wq_requested;
118 /* Wait for cn_queue to be created */
119 wait_queue_head_t wq_created;
120
121 struct list_head queue_list;
122 spinlock_t queue_lock;
123
124 struct sock *nls;
125};
126
127struct cn_callback_id {
128 unsigned char name[CN_CBQ_NAMELEN];
129 struct cb_id id;
130};
131
132struct cn_callback_data {
133 void (*destruct_data) (void *);
134 void *ddata;
135
136 void *callback_priv;
137 void (*callback) (void *);
138
139 void *free;
140};
141
142struct cn_callback_entry {
143 struct list_head callback_entry;
144 struct work_struct work;
145 struct cn_queue_dev *pdev;
146
147 struct cn_callback_id id;
148 struct cn_callback_data data;
149
150 u32 seq, group;
151};
152
153struct cn_ctl_entry {
154 struct list_head notify_entry;
155 struct cn_ctl_msg *msg;
156};
157
158struct cn_dev {
159 struct cb_id id;
160
161 u32 seq, groups;
162 struct sock *nls;
163 void (*input) (struct sk_buff *skb);
164
165 struct cn_queue_dev *cbdev;
166};
167
168int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
169void cn_del_callback(struct cb_id *);
170int cn_netlink_send(struct cn_msg *, u32, gfp_t);
171
172int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
173void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
174
175int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);
176
177struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
178void cn_queue_free_dev(struct cn_queue_dev *dev);
179
180int cn_cb_equal(struct cb_id *, struct cb_id *);
181
182void cn_queue_wrapper(struct work_struct *work);
183
184#endif /* __KERNEL__ */
185#endif /* __CONNECTOR_H */