summaryrefslogtreecommitdiff
path: root/package/wprobe/src/kernel/linux/wprobe.h
blob: f145195cd438371e835682b9431b9468d087768b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/*
 * wprobe.h: API for the wireless probe interface
 * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef __WPROBE_H
#define __WPROBE_H

#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/list.h>
#include <net/genetlink.h>
#endif

/** 
 * enum wprobe_attr: netlink attribute list
 *
 * @WPROBE_ATTR_UNSPEC: unused
 *
 * @WPROBE_ATTR_INTERFACE: interface name to process query on (NLA_STRING)
 * @WPROBE_ATTR_MAC: mac address (used for wireless links) (NLA_STRING)
 * @WPROBE_ATTR_FLAGS: interface/link/attribute flags (see enum wprobe_flags) (NLA_U32)
 * @WPROBE_ATTR_DURATION: sampling duration (in milliseconds) (NLA_MSECS)
 *
 * @WPROBE_ATTR_ID: attribute id (NLA_U32)
 * @WPROBE_ATTR_NAME: attribute name (NLA_STRING)
 * @WPROBE_ATTR_TYPE: attribute type (NLA_U8)
 * @WPROBE_ATTR_SCALE: attribute scale factor (NLA_U32)
 *
 * attribute values:
 *
 * @WPROBE_VAL_STRING: string value (NLA_STRING)
 * @WPROBE_VAL_S8: signed 8-bit integer (NLA_U8)
 * @WPROBE_VAL_S16: signed 16-bit integer (NLA_U16)
 * @WPROBE_VAL_S32: signed 32-bit integer (NLA_U32)
 * @WPROBE_VAL_S64: signed 64-bit integer (NLA_U64)
 * @WPROBE_VAL_U8: unsigned 8-bit integer (NLA_U8)
 * @WPROBE_VAL_U16: unsigned 16-bit integer (NLA_U16)
 * @WPROBE_VAL_U32: unsigned 32-bit integer (NLA_U32)
 * @WPROBE_VAL_U64: unsigned 64-bit integer (NLA_U64)
 *
 * statistics:
 * @WPROBE_VAL_SUM: sum of all samples
 * @WPROBE_VAL_SUM_SQ: sum of all samples^2
 * @WPROBE_VAL_SAMPLES: number of samples
 *
 * @WPROBE_ATTR_LAST: unused
 */
enum wprobe_attr {
	WPROBE_ATTR_UNSPEC,
	WPROBE_ATTR_INTERFACE,
	WPROBE_ATTR_MAC,
	WPROBE_ATTR_FLAGS,
	WPROBE_ATTR_DURATION,
	WPROBE_ATTR_SCALE,
	/* end of query attributes */

	/* response data */
	WPROBE_ATTR_ID,
	WPROBE_ATTR_NAME,
	WPROBE_ATTR_TYPE,

	/* value type attributes */
	WPROBE_VAL_STRING,
	WPROBE_VAL_S8,
	WPROBE_VAL_S16,
	WPROBE_VAL_S32,
	WPROBE_VAL_S64,
	WPROBE_VAL_U8,
	WPROBE_VAL_U16,
	WPROBE_VAL_U32,
	WPROBE_VAL_U64,

	/* aggregates for statistics */
	WPROBE_VAL_SUM,
	WPROBE_VAL_SUM_SQ,
	WPROBE_VAL_SAMPLES,

	WPROBE_ATTR_LAST
};


/**
 * enum wprobe_cmd: netlink commands for interacting with wprobe
 *
 * @WPROBE_CMD_UNSPEC: unused
 *
 * @WPROBE_CMD_GET_LIST: get global/link property list
 * @WPROBE_CMD_GET_INFO: get global/link properties
 * @WPROBE_CMD_SET_FLAGS: set global/link flags
 * @WPROBE_CMD_MEASURE: take a snapshot of the current data
 * @WPROBE_CMD_GET_LINKS: get a list of links
 *
 * @WPROBE_CMD_LAST: unused
 * 
 * options for GET_INFO and SET_FLAGS:
 *   - mac address set: per-link
 *   - mac address unset: globalsa
 */
enum wprobe_cmd {
	WPROBE_CMD_UNSPEC,
	WPROBE_CMD_GET_LIST,
	WPROBE_CMD_GET_INFO,
	WPROBE_CMD_SET_FLAGS,
	WPROBE_CMD_MEASURE,
	WPROBE_CMD_GET_LINKS,
	WPROBE_CMD_LAST
};

/**
 * enum wprobe_flags: flags for wprobe links and items
 * @WPROBE_F_KEEPSTAT: keep statistics for this link/device
 * @WPROBE_F_RESET: reset statistics now (used only in WPROBE_CMD_SET_LINK)
 * @WPROBE_F_NEWDATA: used to indicate that a value has been updated
 */
enum wprobe_flags {
	WPROBE_F_KEEPSTAT = (1 << 0),
	WPROBE_F_RESET = (1 << 1),
	WPROBE_F_NEWDATA = (1 << 2),
};

#ifdef __KERNEL__

struct wprobe_link;
struct wprobe_item;
struct wprobe_source;

/**
 * struct wprobe_link - data structure describing a wireless link
 * @iface: pointer to the wprobe_iface that this link belongs to
 * @addr: BSSID of the remote link partner
 * @flags: link flags (see wprobe_flags)
 * @priv: user pointer
 *
 * @list: for internal use
 * @val: for internal use
 */
struct wprobe_link {
	struct list_head list;
	struct wprobe_iface *iface;
	char addr[ETH_ALEN];
	u32 flags;
	void *priv;
	void *val;
};

/** 
 * struct wprobe_item - data structure describing the format of wprobe_link::data or wprobe_iface::data
 * @name: name of the field
 * @type: data type of this field
 * @flags: measurement item flags (see wprobe_flags)
 */
struct wprobe_item {
	const char *name;
	enum wprobe_attr type;
	u32 flags;
};

struct wprobe_value {
	bool pending;
	union {
		/*
		 * the following are kept uppercase to allow
		 * for automated checking against WPROBE_VAL_*
		 * via BUG_ON()
		 */
		const char *STRING;
		u8 U8;
		u16 U16;
		u32 U32;
		u64 U64;
		s8 S8;
		s16 S16;
		s32 S32;
		s64 S64;
	};
	s64 s, ss;
	unsigned int n;

	/* timestamps */
	u64 first, last;
};

/**
 * struct wprobe_source - data structure describing a wireless interface
 *
 * @name: name of the interface
 * @addr: local mac address of the interface
 * @links: list of wireless links to poll
 * @link_items: description of the per-link data structure
 * @n_link_items: number of link description items
 * @global_items: description of the per-interface data structure
 * @n_global_items: number of per-interface description items
 * @sync_data: callback allowing the driver to prepare data for the wprobe poll
 *
 * @list: head for the list of interfaces
 * @priv: user pointer
 * @lock: spinlock protecting value data access
 * @val: internal use
 * @query_val: internal use
 *
 * if sync_data is NULL, wprobe assumes that it can access the data structure
 * at any time (in atomic context). if sync_data returns a negative error code,
 * the poll request will not be handled for the given link
 */
struct wprobe_iface {
	/* to be filled in by wprobe source drivers */
	const char *name;
	const char *addr;
	const struct wprobe_item *link_items;
	int n_link_items;
	const struct wprobe_item *global_items;
	int n_global_items;

	int (*sync_data)(struct wprobe_iface *dev, struct wprobe_link *l, struct wprobe_value *val, bool measure);
	void *priv;

	/* handled by the wprobe core */
	struct list_head list;
	struct list_head links;
	spinlock_t lock;
	void *val;
	void *query_val;
};

#define WPROBE_FILL_BEGIN(_ptr, _list) do {			\
	struct wprobe_value *__val = (_ptr);			\
	const struct wprobe_item *__item = _list;		\
	u64 __msecs = jiffies_to_msecs(jiffies)

#define WPROBE_SET(_idx, _type, _value)				\
	if (__item[_idx].type != WPROBE_VAL_##_type) {		\
		printk("ERROR: invalid data type at %s:%d\n", __FILE__, __LINE__); \
		break;						\
	}							\
	__val[_idx].pending = true;				\
	__val[_idx]._type = _value;				\
	if (!__val[_idx].first)					\
		__val[_idx].first = __msecs;			\
	__val[_idx].first = __msecs

#define WPROBE_FILL_END()					\
} while(0)

/**
 * wprobe_add_iface: register an interface with the wireless probe subsystem
 * @dev: wprobe_iface structure describing the interface
 */
extern int __weak wprobe_add_iface(struct wprobe_iface *dev);

/**
 * wprobe_remove_iface: deregister an interface from the wireless probe subsystem
 * @dev: wprobe_iface structure describing the interface
 */
extern void __weak wprobe_remove_iface(struct wprobe_iface *dev);

/**
 * wprobe_add_link: register a new wireless link
 * @dev: wprobe_iface structure describing the interface
 * @l: storage space for the wprobe_link structure
 * @addr: mac address of the new link
 *
 * the entire wprobe_link structure is overwritten by this function call
 */
extern int __weak wprobe_add_link(struct wprobe_iface *dev, struct wprobe_link *l, const char *addr);

/**
 * wprobe_remove_link: deregister a previously registered wireless link
 * @dev: wprobe_iface structure describing the interface
 * @l: wprobe_link data structure
 */
extern void __weak wprobe_remove_link(struct wprobe_iface *dev, struct wprobe_link *l);

/**
 * wprobe_update_stats: update statistics after sampling values
 * @dev: wprobe_iface structure describing the interface
 * @l: wprobe_link data structure
 *
 * if l == NULL, then the stats for globals are updated
 */
extern void __weak wprobe_update_stats(struct wprobe_iface *dev, struct wprobe_link *l);

#endif /* __KERNEL__ */

#endif