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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 | ||
00bfddaf | 25 | #include <linux/types.h> |
7672d0b5 EP |
26 | |
27 | #define CN_IDX_CONNECTOR 0xffffffff | |
28 | #define CN_VAL_CONNECTOR 0xffffffff | |
29 | ||
9f46080c MH |
30 | /* |
31 | * Process Events connector unique ids -- used for message routing | |
32 | */ | |
33 | #define CN_IDX_PROC 0x1 | |
34 | #define CN_VAL_PROC 0x1 | |
a2653eba SF |
35 | #define CN_IDX_CIFS 0x2 |
36 | #define CN_VAL_CIFS 0x1 | |
b6043fca EP |
37 | #define CN_W1_IDX 0x3 /* w1 communication */ |
38 | #define CN_W1_VAL 0x1 | |
cc54f46e MJ |
39 | #define CN_IDX_V86D 0x4 |
40 | #define CN_VAL_V86D_UVESAFB 0x1 | |
2c203003 | 41 | #define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */ |
ce0d9d72 EP |
42 | #define CN_DST_IDX 0x6 |
43 | #define CN_DST_VAL 0x1 | |
f5db4af4 JB |
44 | #define CN_IDX_DM 0x7 /* Device Mapper */ |
45 | #define CN_VAL_DM_USERSPACE_LOG 0x1 | |
9f46080c | 46 | |
f5db4af4 | 47 | #define CN_NETLINK_USERS 8 |
7672d0b5 EP |
48 | |
49 | /* | |
50 | * Maximum connector's message size. | |
51 | */ | |
3d62a44f | 52 | #define CONNECTOR_MAX_MSG_SIZE 16384 |
7672d0b5 EP |
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 | ||
60 | struct cb_id { | |
61 | __u32 idx; | |
62 | __u32 val; | |
63 | }; | |
64 | ||
65 | struct 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 | /* | |
77 | * Notify structure - requests notification about | |
78 | * registering/unregistering idx/val in range [first, first+range]. | |
79 | */ | |
80 | struct cn_notify_req { | |
81 | __u32 first; | |
82 | __u32 range; | |
83 | }; | |
84 | ||
85 | /* | |
86 | * Main notification control message | |
87 | * *_notify_num - number of appropriate cn_notify_req structures after | |
88 | * this struct. | |
89 | * group - notification receiver's idx. | |
90 | * len - total length of the attached data. | |
91 | */ | |
92 | struct cn_ctl_msg { | |
93 | __u32 idx_notify_num; | |
94 | __u32 val_notify_num; | |
95 | __u32 group; | |
96 | __u32 len; | |
97 | __u8 data[0]; | |
98 | }; | |
99 | ||
100 | #ifdef __KERNEL__ | |
101 | ||
102 | #include <asm/atomic.h> | |
103 | ||
104 | #include <linux/list.h> | |
105 | #include <linux/workqueue.h> | |
106 | ||
107 | #include <net/sock.h> | |
108 | ||
109 | #define CN_CBQ_NAMELEN 32 | |
110 | ||
111 | struct cn_queue_dev { | |
112 | atomic_t refcnt; | |
113 | unsigned char name[CN_CBQ_NAMELEN]; | |
114 | ||
115 | struct workqueue_struct *cn_queue; | |
1a5645bc FW |
116 | /* Sent to kevent to create cn_queue only when needed */ |
117 | struct work_struct wq_creation; | |
118 | /* Tell if the wq_creation job is pending/completed */ | |
119 | atomic_t wq_requested; | |
120 | /* Wait for cn_queue to be created */ | |
121 | wait_queue_head_t wq_created; | |
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122 | |
123 | struct list_head queue_list; | |
124 | spinlock_t queue_lock; | |
125 | ||
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126 | struct sock *nls; |
127 | }; | |
128 | ||
acd042bb | 129 | struct cn_callback_id { |
7672d0b5 | 130 | unsigned char name[CN_CBQ_NAMELEN]; |
7672d0b5 | 131 | struct cb_id id; |
acd042bb EP |
132 | }; |
133 | ||
134 | struct cn_callback_data { | |
293500a2 | 135 | struct sk_buff *skb; |
7069331d | 136 | void (*callback) (struct cn_msg *, struct netlink_skb_parms *); |
acd042bb EP |
137 | |
138 | void *free; | |
7672d0b5 EP |
139 | }; |
140 | ||
141 | struct cn_callback_entry { | |
142 | struct list_head callback_entry; | |
a240d9f1 | 143 | struct work_struct work; |
7672d0b5 EP |
144 | struct cn_queue_dev *pdev; |
145 | ||
acd042bb EP |
146 | struct cn_callback_id id; |
147 | struct cn_callback_data data; | |
7672d0b5 | 148 | |
6e32814b | 149 | u32 seq, group; |
7672d0b5 EP |
150 | }; |
151 | ||
152 | struct cn_ctl_entry { | |
153 | struct list_head notify_entry; | |
154 | struct cn_ctl_msg *msg; | |
155 | }; | |
156 | ||
157 | struct cn_dev { | |
158 | struct cb_id id; | |
159 | ||
160 | u32 seq, groups; | |
161 | struct sock *nls; | |
cd40b7d3 | 162 | void (*input) (struct sk_buff *skb); |
7672d0b5 EP |
163 | |
164 | struct cn_queue_dev *cbdev; | |
165 | }; | |
166 | ||
7069331d | 167 | int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *)); |
7672d0b5 | 168 | void cn_del_callback(struct cb_id *); |
dd0fc66f | 169 | int cn_netlink_send(struct cn_msg *, u32, gfp_t); |
7672d0b5 | 170 | |
7069331d | 171 | int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); |
7672d0b5 EP |
172 | void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); |
173 | ||
1a5645bc FW |
174 | int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); |
175 | ||
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176 | struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); |
177 | void cn_queue_free_dev(struct cn_queue_dev *dev); | |
178 | ||
179 | int cn_cb_equal(struct cb_id *, struct cb_id *); | |
180 | ||
c4028958 | 181 | void cn_queue_wrapper(struct work_struct *work); |
acd042bb | 182 | |
7672d0b5 EP |
183 | #endif /* __KERNEL__ */ |
184 | #endif /* __CONNECTOR_H */ |