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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/*
28 * Process Events connector unique ids -- used for message routing
29 */
30#define CN_IDX_PROC 0x1
31#define CN_VAL_PROC 0x1
32#define CN_IDX_CIFS 0x2
33#define CN_VAL_CIFS 0x1
34#define CN_W1_IDX 0x3 /* w1 communication */
35#define CN_W1_VAL 0x1
36#define CN_IDX_V86D 0x4
37#define CN_VAL_V86D_UVESAFB 0x1
38#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
39#define CN_DST_IDX 0x6
40#define CN_DST_VAL 0x1
41#define CN_IDX_DM 0x7 /* Device Mapper */
42#define CN_VAL_DM_USERSPACE_LOG 0x1
43#define CN_IDX_DRBD 0x8
44#define CN_VAL_DRBD 0x1
45#define CN_KVP_IDX 0x9 /* HyperV KVP */
46
47#define CN_NETLINK_USERS 10 /* Highest index + 1 */
48
49/*
50 * Maximum connector's message size.
51 */
52#define CONNECTOR_MAX_MSG_SIZE 16384
53
54/*
55 * idx and val are unique identifiers which
56 * are used for message routing and
57 * must be registered in connector.h for in-kernel usage.
58 */
59
60struct cb_id {
61 __u32 idx;
62 __u32 val;
63};
64
65struct cn_msg {
66 struct cb_id id;
67
68 __u32 seq;
69 __u32 ack;
70
71 __u16 len; /* Length of the following data */
72 __u16 flags;
73 __u8 data[0];
74};
75
76#ifdef __KERNEL__
77
78#include <asm/atomic.h>
79
80#include <linux/list.h>
81#include <linux/workqueue.h>
82
83#include <net/sock.h>
84
85#define CN_CBQ_NAMELEN 32
86
87struct cn_queue_dev {
88 atomic_t refcnt;
89 unsigned char name[CN_CBQ_NAMELEN];
90
91 struct list_head queue_list;
92 spinlock_t queue_lock;
93
94 struct sock *nls;
95};
96
97struct cn_callback_id {
98 unsigned char name[CN_CBQ_NAMELEN];
99 struct cb_id id;
100};
101
102struct cn_callback_entry {
103 struct list_head callback_entry;
104 atomic_t refcnt;
105 struct cn_queue_dev *pdev;
106
107 struct cn_callback_id id;
108 void (*callback) (struct cn_msg *, struct netlink_skb_parms *);
109
110 u32 seq, group;
111};
112
113struct cn_dev {
114 struct cb_id id;
115
116 u32 seq, groups;
117 struct sock *nls;
118 void (*input) (struct sk_buff *skb);
119
120 struct cn_queue_dev *cbdev;
121};
122
123int cn_add_callback(struct cb_id *id, const char *name,
124 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
125void cn_del_callback(struct cb_id *);
126int cn_netlink_send(struct cn_msg *, u32, gfp_t);
127
128int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
129 struct cb_id *id,
130 void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
131void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
132void cn_queue_release_callback(struct cn_callback_entry *);
133
134struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *);
135void cn_queue_free_dev(struct cn_queue_dev *dev);
136
137int cn_cb_equal(struct cb_id *, struct cb_id *);
138
139#endif /* __KERNEL__ */
140#endif /* __CONNECTOR_H */