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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
43#define CN_NETLINK_USERS 6
44
45/*
46 * Maximum connector's message size.
47 */
48#define CONNECTOR_MAX_MSG_SIZE 16384
49
50/*
51 * idx and val are unique identifiers which
52 * are used for message routing and
53 * must be registered in connector.h for in-kernel usage.
54 */
55
56struct cb_id {
57 __u32 idx;
58 __u32 val;
59};
60
61struct cn_msg {
62 struct cb_id id;
63
64 __u32 seq;
65 __u32 ack;
66
67 __u16 len; /* Length of the following data */
68 __u16 flags;
69 __u8 data[0];
70};
71
72/*
73 * Notify structure - requests notification about
74 * registering/unregistering idx/val in range [first, first+range].
75 */
76struct cn_notify_req {
77 __u32 first;
78 __u32 range;
79};
80
81/*
82 * Main notification control message
83 * *_notify_num - number of appropriate cn_notify_req structures after
84 * this struct.
85 * group - notification receiver's idx.
86 * len - total length of the attached data.
87 */
88struct cn_ctl_msg {
89 __u32 idx_notify_num;
90 __u32 val_notify_num;
91 __u32 group;
92 __u32 len;
93 __u8 data[0];
94};
95
96#ifdef __KERNEL__
97
98#include <asm/atomic.h>
99
100#include <linux/list.h>
101#include <linux/workqueue.h>
102
103#include <net/sock.h>
104
105#define CN_CBQ_NAMELEN 32
106
107struct cn_queue_dev {
108 atomic_t refcnt;
109 unsigned char name[CN_CBQ_NAMELEN];
110
111 struct workqueue_struct *cn_queue;
112
113 struct list_head queue_list;
114 spinlock_t queue_lock;
115
116 struct sock *nls;
117};
118
119struct cn_callback_id {
120 unsigned char name[CN_CBQ_NAMELEN];
121 struct cb_id id;
122};
123
124struct cn_callback_data {
125 void (*destruct_data) (void *);
126 void *ddata;
127
128 void *callback_priv;
129 void (*callback) (void *);
130
131 void *free;
132};
133
134struct cn_callback_entry {
135 struct list_head callback_entry;
136 struct work_struct work;
137 struct cn_queue_dev *pdev;
138
139 struct cn_callback_id id;
140 struct cn_callback_data data;
141
142 u32 seq, group;
143};
144
145struct cn_ctl_entry {
146 struct list_head notify_entry;
147 struct cn_ctl_msg *msg;
148};
149
150struct cn_dev {
151 struct cb_id id;
152
153 u32 seq, groups;
154 struct sock *nls;
155 void (*input) (struct sk_buff *skb);
156
157 struct cn_queue_dev *cbdev;
158};
159
160int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
161void cn_del_callback(struct cb_id *);
162int cn_netlink_send(struct cn_msg *, u32, gfp_t);
163
164int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
165void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
166
167struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
168void cn_queue_free_dev(struct cn_queue_dev *dev);
169
170int cn_cb_equal(struct cb_id *, struct cb_id *);
171
172void cn_queue_wrapper(struct work_struct *work);
173
174#endif /* __KERNEL__ */
175#endif /* __CONNECTOR_H */